Struct syn::punctuated::Punctuated
source · pub struct Punctuated<T, P> { /* private fields */ }Expand description
A punctuated sequence of syntax tree nodes of type T separated by
punctuation of type P.
Refer to the module documentation for details about punctuated sequences.
Implementations§
source§impl<T, P> Punctuated<T, P>
impl<T, P> Punctuated<T, P>
sourcepub const fn new() -> Self
pub const fn new() -> Self
Creates an empty punctuated sequence.
Examples found in repository?
src/generics.rs (line 99)
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fn default() -> Self {
Generics {
lt_token: None,
params: Punctuated::new(),
gt_token: None,
where_clause: None,
}
}
}
impl Generics {
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &</code><a
/// href="struct.TypeParam.html"><code
/// style="padding-left:0;padding-right:0;">TypeParam</code></a><code
/// style="padding-left:0;">></code>
/// over the type parameters in `self.params`.
pub fn type_params(&self) -> TypeParams {
TypeParams(self.params.iter())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &mut </code><a
/// href="struct.TypeParam.html"><code
/// style="padding-left:0;padding-right:0;">TypeParam</code></a><code
/// style="padding-left:0;">></code>
/// over the type parameters in `self.params`.
pub fn type_params_mut(&mut self) -> TypeParamsMut {
TypeParamsMut(self.params.iter_mut())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &</code><a
/// href="struct.LifetimeDef.html"><code
/// style="padding-left:0;padding-right:0;">LifetimeDef</code></a><code
/// style="padding-left:0;">></code>
/// over the lifetime parameters in `self.params`.
pub fn lifetimes(&self) -> Lifetimes {
Lifetimes(self.params.iter())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &mut </code><a
/// href="struct.LifetimeDef.html"><code
/// style="padding-left:0;padding-right:0;">LifetimeDef</code></a><code
/// style="padding-left:0;">></code>
/// over the lifetime parameters in `self.params`.
pub fn lifetimes_mut(&mut self) -> LifetimesMut {
LifetimesMut(self.params.iter_mut())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &</code><a
/// href="struct.ConstParam.html"><code
/// style="padding-left:0;padding-right:0;">ConstParam</code></a><code
/// style="padding-left:0;">></code>
/// over the constant parameters in `self.params`.
pub fn const_params(&self) -> ConstParams {
ConstParams(self.params.iter())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &mut </code><a
/// href="struct.ConstParam.html"><code
/// style="padding-left:0;padding-right:0;">ConstParam</code></a><code
/// style="padding-left:0;">></code>
/// over the constant parameters in `self.params`.
pub fn const_params_mut(&mut self) -> ConstParamsMut {
ConstParamsMut(self.params.iter_mut())
}
/// Initializes an empty `where`-clause if there is not one present already.
pub fn make_where_clause(&mut self) -> &mut WhereClause {
self.where_clause.get_or_insert_with(|| WhereClause {
where_token: <Token![where]>::default(),
predicates: Punctuated::new(),
})
}
}
pub struct TypeParams<'a>(Iter<'a, GenericParam>);
impl<'a> Iterator for TypeParams<'a> {
type Item = &'a TypeParam;
fn next(&mut self) -> Option<Self::Item> {
let next = match self.0.next() {
Some(item) => item,
None => return None,
};
if let GenericParam::Type(type_param) = next {
Some(type_param)
} else {
self.next()
}
}
}
pub struct TypeParamsMut<'a>(IterMut<'a, GenericParam>);
impl<'a> Iterator for TypeParamsMut<'a> {
type Item = &'a mut TypeParam;
fn next(&mut self) -> Option<Self::Item> {
let next = match self.0.next() {
Some(item) => item,
None => return None,
};
if let GenericParam::Type(type_param) = next {
Some(type_param)
} else {
self.next()
}
}
}
pub struct Lifetimes<'a>(Iter<'a, GenericParam>);
impl<'a> Iterator for Lifetimes<'a> {
type Item = &'a LifetimeDef;
fn next(&mut self) -> Option<Self::Item> {
let next = match self.0.next() {
Some(item) => item,
None => return None,
};
if let GenericParam::Lifetime(lifetime) = next {
Some(lifetime)
} else {
self.next()
}
}
}
pub struct LifetimesMut<'a>(IterMut<'a, GenericParam>);
impl<'a> Iterator for LifetimesMut<'a> {
type Item = &'a mut LifetimeDef;
fn next(&mut self) -> Option<Self::Item> {
let next = match self.0.next() {
Some(item) => item,
None => return None,
};
if let GenericParam::Lifetime(lifetime) = next {
Some(lifetime)
} else {
self.next()
}
}
}
pub struct ConstParams<'a>(Iter<'a, GenericParam>);
impl<'a> Iterator for ConstParams<'a> {
type Item = &'a ConstParam;
fn next(&mut self) -> Option<Self::Item> {
let next = match self.0.next() {
Some(item) => item,
None => return None,
};
if let GenericParam::Const(const_param) = next {
Some(const_param)
} else {
self.next()
}
}
}
pub struct ConstParamsMut<'a>(IterMut<'a, GenericParam>);
impl<'a> Iterator for ConstParamsMut<'a> {
type Item = &'a mut ConstParam;
fn next(&mut self) -> Option<Self::Item> {
let next = match self.0.next() {
Some(item) => item,
None => return None,
};
if let GenericParam::Const(const_param) = next {
Some(const_param)
} else {
self.next()
}
}
}
/// Returned by `Generics::split_for_impl`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature and the `"printing"` feature.*
#[cfg(feature = "printing")]
#[cfg_attr(
doc_cfg,
doc(cfg(all(any(feature = "full", feature = "derive"), feature = "printing")))
)]
pub struct ImplGenerics<'a>(&'a Generics);
/// Returned by `Generics::split_for_impl`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature and the `"printing"` feature.*
#[cfg(feature = "printing")]
#[cfg_attr(
doc_cfg,
doc(cfg(all(any(feature = "full", feature = "derive"), feature = "printing")))
)]
pub struct TypeGenerics<'a>(&'a Generics);
/// Returned by `TypeGenerics::as_turbofish`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature and the `"printing"` feature.*
#[cfg(feature = "printing")]
#[cfg_attr(
doc_cfg,
doc(cfg(all(any(feature = "full", feature = "derive"), feature = "printing")))
)]
pub struct Turbofish<'a>(&'a Generics);
#[cfg(feature = "printing")]
impl Generics {
/// Split a type's generics into the pieces required for impl'ing a trait
/// for that type.
///
/// ```
/// # use proc_macro2::{Span, Ident};
/// # use quote::quote;
/// #
/// # let generics: syn::Generics = Default::default();
/// # let name = Ident::new("MyType", Span::call_site());
/// #
/// let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
/// quote! {
/// impl #impl_generics MyTrait for #name #ty_generics #where_clause {
/// // ...
/// }
/// }
/// # ;
/// ```
///
/// *This method is available only if Syn is built with the `"derive"` or
/// `"full"` feature and the `"printing"` feature.*
#[cfg_attr(
doc_cfg,
doc(cfg(all(any(feature = "full", feature = "derive"), feature = "printing")))
)]
pub fn split_for_impl(&self) -> (ImplGenerics, TypeGenerics, Option<&WhereClause>) {
(
ImplGenerics(self),
TypeGenerics(self),
self.where_clause.as_ref(),
)
}
}
#[cfg(feature = "printing")]
macro_rules! generics_wrapper_impls {
($ty:ident) => {
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<'a> Clone for $ty<'a> {
fn clone(&self) -> Self {
$ty(self.0)
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<'a> Debug for $ty<'a> {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter
.debug_tuple(stringify!($ty))
.field(self.0)
.finish()
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<'a> Eq for $ty<'a> {}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<'a> PartialEq for $ty<'a> {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<'a> Hash for $ty<'a> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.0.hash(state);
}
}
};
}
#[cfg(feature = "printing")]
generics_wrapper_impls!(ImplGenerics);
#[cfg(feature = "printing")]
generics_wrapper_impls!(TypeGenerics);
#[cfg(feature = "printing")]
generics_wrapper_impls!(Turbofish);
#[cfg(feature = "printing")]
impl<'a> TypeGenerics<'a> {
/// Turn a type's generics like `<X, Y>` into a turbofish like `::<X, Y>`.
///
/// *This method is available only if Syn is built with the `"derive"` or
/// `"full"` feature and the `"printing"` feature.*
pub fn as_turbofish(&self) -> Turbofish {
Turbofish(self.0)
}
}
ast_struct! {
/// A set of bound lifetimes: `for<'a, 'b, 'c>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct BoundLifetimes {
pub for_token: Token![for],
pub lt_token: Token![<],
pub lifetimes: Punctuated<LifetimeDef, Token![,]>,
pub gt_token: Token![>],
}
}
impl Default for BoundLifetimes {
fn default() -> Self {
BoundLifetimes {
for_token: Default::default(),
lt_token: Default::default(),
lifetimes: Punctuated::new(),
gt_token: Default::default(),
}
}
}
impl LifetimeDef {
pub fn new(lifetime: Lifetime) -> Self {
LifetimeDef {
attrs: Vec::new(),
lifetime,
colon_token: None,
bounds: Punctuated::new(),
}
}
}
impl From<Ident> for TypeParam {
fn from(ident: Ident) -> Self {
TypeParam {
attrs: vec![],
ident,
colon_token: None,
bounds: Punctuated::new(),
eq_token: None,
default: None,
}
}
}
ast_enum_of_structs! {
/// A trait or lifetime used as a bound on a type parameter.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum TypeParamBound {
Trait(TraitBound),
Lifetime(Lifetime),
}
}
ast_struct! {
/// A trait used as a bound on a type parameter.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct TraitBound {
pub paren_token: Option<token::Paren>,
pub modifier: TraitBoundModifier,
/// The `for<'a>` in `for<'a> Foo<&'a T>`
pub lifetimes: Option<BoundLifetimes>,
/// The `Foo<&'a T>` in `for<'a> Foo<&'a T>`
pub path: Path,
}
}
ast_enum! {
/// A modifier on a trait bound, currently only used for the `?` in
/// `?Sized`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum TraitBoundModifier {
None,
Maybe(Token![?]),
}
}
ast_struct! {
/// A `where` clause in a definition: `where T: Deserialize<'de>, D:
/// 'static`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct WhereClause {
pub where_token: Token![where],
pub predicates: Punctuated<WherePredicate, Token![,]>,
}
}
ast_enum_of_structs! {
/// A single predicate in a `where` clause: `T: Deserialize<'de>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
///
/// # Syntax tree enum
///
/// This type is a [syntax tree enum].
///
/// [syntax tree enum]: Expr#syntax-tree-enums
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum WherePredicate {
/// A type predicate in a `where` clause: `for<'c> Foo<'c>: Trait<'c>`.
Type(PredicateType),
/// A lifetime predicate in a `where` clause: `'a: 'b + 'c`.
Lifetime(PredicateLifetime),
/// An equality predicate in a `where` clause (unsupported).
Eq(PredicateEq),
}
}
ast_struct! {
/// A type predicate in a `where` clause: `for<'c> Foo<'c>: Trait<'c>`.
///
/// *This type is available only if Syn is built with the `"derive"` or
/// `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct PredicateType {
/// Any lifetimes from a `for` binding
pub lifetimes: Option<BoundLifetimes>,
/// The type being bounded
pub bounded_ty: Type,
pub colon_token: Token![:],
/// Trait and lifetime bounds (`Clone+Send+'static`)
pub bounds: Punctuated<TypeParamBound, Token![+]>,
}
}
ast_struct! {
/// A lifetime predicate in a `where` clause: `'a: 'b + 'c`.
///
/// *This type is available only if Syn is built with the `"derive"` or
/// `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct PredicateLifetime {
pub lifetime: Lifetime,
pub colon_token: Token![:],
pub bounds: Punctuated<Lifetime, Token![+]>,
}
}
ast_struct! {
/// An equality predicate in a `where` clause (unsupported).
///
/// *This type is available only if Syn is built with the `"derive"` or
/// `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct PredicateEq {
pub lhs_ty: Type,
pub eq_token: Token![=],
pub rhs_ty: Type,
}
}
#[cfg(feature = "parsing")]
pub mod parsing {
use super::*;
use crate::ext::IdentExt;
use crate::parse::{Parse, ParseStream, Result};
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Generics {
fn parse(input: ParseStream) -> Result<Self> {
if !input.peek(Token![<]) {
return Ok(Generics::default());
}
let lt_token: Token![<] = input.parse()?;
let mut params = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let attrs = input.call(Attribute::parse_outer)?;
let lookahead = input.lookahead1();
if lookahead.peek(Lifetime) {
params.push_value(GenericParam::Lifetime(LifetimeDef {
attrs,
..input.parse()?
}));
} else if lookahead.peek(Ident) {
params.push_value(GenericParam::Type(TypeParam {
attrs,
..input.parse()?
}));
} else if lookahead.peek(Token![const]) {
params.push_value(GenericParam::Const(ConstParam {
attrs,
..input.parse()?
}));
} else if input.peek(Token![_]) {
params.push_value(GenericParam::Type(TypeParam {
attrs,
ident: input.call(Ident::parse_any)?,
colon_token: None,
bounds: Punctuated::new(),
eq_token: None,
default: None,
}));
} else {
return Err(lookahead.error());
}
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
params.push_punct(punct);
}
let gt_token: Token![>] = input.parse()?;
Ok(Generics {
lt_token: Some(lt_token),
params,
gt_token: Some(gt_token),
where_clause: None,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericParam {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let lookahead = input.lookahead1();
if lookahead.peek(Ident) {
Ok(GenericParam::Type(TypeParam {
attrs,
..input.parse()?
}))
} else if lookahead.peek(Lifetime) {
Ok(GenericParam::Lifetime(LifetimeDef {
attrs,
..input.parse()?
}))
} else if lookahead.peek(Token![const]) {
Ok(GenericParam::Const(ConstParam {
attrs,
..input.parse()?
}))
} else {
Err(lookahead.error())
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for LifetimeDef {
fn parse(input: ParseStream) -> Result<Self> {
let has_colon;
Ok(LifetimeDef {
attrs: input.call(Attribute::parse_outer)?,
lifetime: input.parse()?,
colon_token: {
if input.peek(Token![:]) {
has_colon = true;
Some(input.parse()?)
} else {
has_colon = false;
None
}
},
bounds: {
let mut bounds = Punctuated::new();
if has_colon {
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
}
bounds
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for BoundLifetimes {
fn parse(input: ParseStream) -> Result<Self> {
Ok(BoundLifetimes {
for_token: input.parse()?,
lt_token: input.parse()?,
lifetimes: {
let mut lifetimes = Punctuated::new();
while !input.peek(Token![>]) {
lifetimes.push_value(input.parse()?);
if input.peek(Token![>]) {
break;
}
lifetimes.push_punct(input.parse()?);
}
lifetimes
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<BoundLifetimes> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![for]) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeParam {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let ident: Ident = input.parse()?;
let colon_token: Option<Token![:]> = input.parse()?;
let begin_bound = input.fork();
let mut is_maybe_const = false;
let mut bounds = Punctuated::new();
if colon_token.is_some() {
loop {
if input.peek(Token![,]) || input.peek(Token![>]) || input.peek(Token![=]) {
break;
}
if input.peek(Token![~]) && input.peek2(Token![const]) {
input.parse::<Token![~]>()?;
input.parse::<Token![const]>()?;
is_maybe_const = true;
}
let value: TypeParamBound = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct: Token![+] = input.parse()?;
bounds.push_punct(punct);
}
}
let mut eq_token: Option<Token![=]> = input.parse()?;
let mut default = if eq_token.is_some() {
Some(input.parse::<Type>()?)
} else {
None
};
if is_maybe_const {
bounds.clear();
eq_token = None;
default = Some(Type::Verbatim(verbatim::between(begin_bound, input)));
}
Ok(TypeParam {
attrs,
ident,
colon_token,
bounds,
eq_token,
default,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeParamBound {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) {
return input.parse().map(TypeParamBound::Lifetime);
}
if input.peek(token::Paren) {
let content;
let paren_token = parenthesized!(content in input);
let mut bound: TraitBound = content.parse()?;
bound.paren_token = Some(paren_token);
return Ok(TypeParamBound::Trait(bound));
}
input.parse().map(TypeParamBound::Trait)
}
}
impl TypeParamBound {
pub(crate) fn parse_multiple(
input: ParseStream,
allow_plus: bool,
) -> Result<Punctuated<Self, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
bounds.push_value(input.parse()?);
if !(allow_plus && input.peek(Token![+])) {
break;
}
bounds.push_punct(input.parse()?);
if !(input.peek(Ident::peek_any)
|| input.peek(Token![::])
|| input.peek(Token![?])
|| input.peek(Lifetime)
|| input.peek(token::Paren))
{
break;
}
}
Ok(bounds)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitBound {
fn parse(input: ParseStream) -> Result<Self> {
#[cfg(feature = "full")]
let tilde_const = if input.peek(Token![~]) && input.peek2(Token![const]) {
let tilde_token = input.parse::<Token![~]>()?;
let const_token = input.parse::<Token![const]>()?;
Some((tilde_token, const_token))
} else {
None
};
let modifier: TraitBoundModifier = input.parse()?;
let lifetimes: Option<BoundLifetimes> = input.parse()?;
let mut path: Path = input.parse()?;
if path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
}
#[cfg(feature = "full")]
{
if let Some((tilde_token, const_token)) = tilde_const {
path.segments.insert(
0,
PathSegment {
ident: Ident::new("const", const_token.span),
arguments: PathArguments::None,
},
);
let (_const, punct) = path.segments.pairs_mut().next().unwrap().into_tuple();
*punct.unwrap() = Token;
}
}
Ok(TraitBound {
paren_token: None,
modifier,
lifetimes,
path,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitBoundModifier {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![?]) {
input.parse().map(TraitBoundModifier::Maybe)
} else {
Ok(TraitBoundModifier::None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ConstParam {
fn parse(input: ParseStream) -> Result<Self> {
let mut default = None;
Ok(ConstParam {
attrs: input.call(Attribute::parse_outer)?,
const_token: input.parse()?,
ident: input.parse()?,
colon_token: input.parse()?,
ty: input.parse()?,
eq_token: {
if input.peek(Token![=]) {
let eq_token = input.parse()?;
default = Some(path::parsing::const_argument(input)?);
Some(eq_token)
} else {
None
}
},
default,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for WhereClause {
fn parse(input: ParseStream) -> Result<Self> {
Ok(WhereClause {
where_token: input.parse()?,
predicates: {
let mut predicates = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
predicates.push_value(value);
if !input.peek(Token![,]) {
break;
}
let punct = input.parse()?;
predicates.push_punct(punct);
}
predicates
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<WhereClause> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![where]) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for WherePredicate {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) && input.peek2(Token![:]) {
Ok(WherePredicate::Lifetime(PredicateLifetime {
lifetime: input.parse()?,
colon_token: input.parse()?,
bounds: {
let mut bounds = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
bounds
},
}))
} else {
Ok(WherePredicate::Type(PredicateType {
lifetimes: input.parse()?,
bounded_ty: input.parse()?,
colon_token: input.parse()?,
bounds: {
let mut bounds = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
bounds
},
}))
}
}More examples
src/expr.rs (line 790)
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const DUMMY: Self = Expr::Path(ExprPath {
attrs: Vec::new(),
qself: None,
path: Path {
leading_colon: None,
segments: Punctuated::new(),
},
});
#[cfg(all(feature = "parsing", feature = "full"))]
pub(crate) fn replace_attrs(&mut self, new: Vec<Attribute>) -> Vec<Attribute> {
match self {
Expr::Box(ExprBox { attrs, .. })
| Expr::Array(ExprArray { attrs, .. })
| Expr::Call(ExprCall { attrs, .. })
| Expr::MethodCall(ExprMethodCall { attrs, .. })
| Expr::Tuple(ExprTuple { attrs, .. })
| Expr::Binary(ExprBinary { attrs, .. })
| Expr::Unary(ExprUnary { attrs, .. })
| Expr::Lit(ExprLit { attrs, .. })
| Expr::Cast(ExprCast { attrs, .. })
| Expr::Type(ExprType { attrs, .. })
| Expr::Let(ExprLet { attrs, .. })
| Expr::If(ExprIf { attrs, .. })
| Expr::While(ExprWhile { attrs, .. })
| Expr::ForLoop(ExprForLoop { attrs, .. })
| Expr::Loop(ExprLoop { attrs, .. })
| Expr::Match(ExprMatch { attrs, .. })
| Expr::Closure(ExprClosure { attrs, .. })
| Expr::Unsafe(ExprUnsafe { attrs, .. })
| Expr::Block(ExprBlock { attrs, .. })
| Expr::Assign(ExprAssign { attrs, .. })
| Expr::AssignOp(ExprAssignOp { attrs, .. })
| Expr::Field(ExprField { attrs, .. })
| Expr::Index(ExprIndex { attrs, .. })
| Expr::Range(ExprRange { attrs, .. })
| Expr::Path(ExprPath { attrs, .. })
| Expr::Reference(ExprReference { attrs, .. })
| Expr::Break(ExprBreak { attrs, .. })
| Expr::Continue(ExprContinue { attrs, .. })
| Expr::Return(ExprReturn { attrs, .. })
| Expr::Macro(ExprMacro { attrs, .. })
| Expr::Struct(ExprStruct { attrs, .. })
| Expr::Repeat(ExprRepeat { attrs, .. })
| Expr::Paren(ExprParen { attrs, .. })
| Expr::Group(ExprGroup { attrs, .. })
| Expr::Try(ExprTry { attrs, .. })
| Expr::Async(ExprAsync { attrs, .. })
| Expr::Await(ExprAwait { attrs, .. })
| Expr::TryBlock(ExprTryBlock { attrs, .. })
| Expr::Yield(ExprYield { attrs, .. }) => mem::replace(attrs, new),
Expr::Verbatim(_) => Vec::new(),
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
}
ast_enum! {
/// A struct or tuple struct field accessed in a struct literal or field
/// expression.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum Member {
/// A named field like `self.x`.
Named(Ident),
/// An unnamed field like `self.0`.
Unnamed(Index),
}
}
impl From<Ident> for Member {
fn from(ident: Ident) -> Member {
Member::Named(ident)
}
}
impl From<Index> for Member {
fn from(index: Index) -> Member {
Member::Unnamed(index)
}
}
impl From<usize> for Member {
fn from(index: usize) -> Member {
Member::Unnamed(Index::from(index))
}
}
impl Eq for Member {}
impl PartialEq for Member {
fn eq(&self, other: &Self) -> bool {
match (self, other) {
(Member::Named(this), Member::Named(other)) => this == other,
(Member::Unnamed(this), Member::Unnamed(other)) => this == other,
_ => false,
}
}
}
impl Hash for Member {
fn hash<H: Hasher>(&self, state: &mut H) {
match self {
Member::Named(m) => m.hash(state),
Member::Unnamed(m) => m.hash(state),
}
}
}
#[cfg(feature = "printing")]
impl IdentFragment for Member {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
match self {
Member::Named(m) => Display::fmt(m, formatter),
Member::Unnamed(m) => Display::fmt(&m.index, formatter),
}
}
fn span(&self) -> Option<Span> {
match self {
Member::Named(m) => Some(m.span()),
Member::Unnamed(m) => Some(m.span),
}
}
}
ast_struct! {
/// The index of an unnamed tuple struct field.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct Index {
pub index: u32,
pub span: Span,
}
}
impl From<usize> for Index {
fn from(index: usize) -> Index {
assert!(index < u32::max_value() as usize);
Index {
index: index as u32,
span: Span::call_site(),
}
}
}
impl Eq for Index {}
impl PartialEq for Index {
fn eq(&self, other: &Self) -> bool {
self.index == other.index
}
}
impl Hash for Index {
fn hash<H: Hasher>(&self, state: &mut H) {
self.index.hash(state);
}
}
#[cfg(feature = "printing")]
impl IdentFragment for Index {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
Display::fmt(&self.index, formatter)
}
fn span(&self) -> Option<Span> {
Some(self.span)
}
}
#[cfg(feature = "full")]
ast_struct! {
/// The `::<>` explicit type parameters passed to a method call:
/// `parse::<u64>()`.
///
/// *This type is available only if Syn is built with the `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
pub struct MethodTurbofish {
pub colon2_token: Token![::],
pub lt_token: Token![<],
pub args: Punctuated<GenericMethodArgument, Token![,]>,
pub gt_token: Token![>],
}
}
#[cfg(feature = "full")]
ast_enum! {
/// An individual generic argument to a method, like `T`.
///
/// *This type is available only if Syn is built with the `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
pub enum GenericMethodArgument {
/// A type argument.
Type(Type),
/// A const expression. Must be inside of a block.
///
/// NOTE: Identity expressions are represented as Type arguments, as
/// they are indistinguishable syntactically.
Const(Expr),
}
}
#[cfg(feature = "full")]
ast_struct! {
/// A field-value pair in a struct literal.
///
/// *This type is available only if Syn is built with the `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
pub struct FieldValue {
/// Attributes tagged on the field.
pub attrs: Vec<Attribute>,
/// Name or index of the field.
pub member: Member,
/// The colon in `Struct { x: x }`. If written in shorthand like
/// `Struct { x }`, there is no colon.
pub colon_token: Option<Token![:]>,
/// Value of the field.
pub expr: Expr,
}
}
#[cfg(feature = "full")]
ast_struct! {
/// A lifetime labeling a `for`, `while`, or `loop`.
///
/// *This type is available only if Syn is built with the `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
pub struct Label {
pub name: Lifetime,
pub colon_token: Token![:],
}
}
#[cfg(feature = "full")]
ast_struct! {
/// One arm of a `match` expression: `0...10 => { return true; }`.
///
/// As in:
///
/// ```
/// # fn f() -> bool {
/// # let n = 0;
/// match n {
/// 0...10 => {
/// return true;
/// }
/// // ...
/// # _ => {}
/// }
/// # false
/// # }
/// ```
///
/// *This type is available only if Syn is built with the `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
pub struct Arm {
pub attrs: Vec<Attribute>,
pub pat: Pat,
pub guard: Option<(Token![if], Box<Expr>)>,
pub fat_arrow_token: Token![=>],
pub body: Box<Expr>,
pub comma: Option<Token![,]>,
}
}
#[cfg(feature = "full")]
ast_enum! {
/// Limit types of a range, inclusive or exclusive.
///
/// *This type is available only if Syn is built with the `"full"` feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
pub enum RangeLimits {
/// Inclusive at the beginning, exclusive at the end.
HalfOpen(Token![..]),
/// Inclusive at the beginning and end.
Closed(Token![..=]),
}
}
#[cfg(any(feature = "parsing", feature = "printing"))]
#[cfg(feature = "full")]
pub(crate) fn requires_terminator(expr: &Expr) -> bool {
// see https://github.com/rust-lang/rust/blob/2679c38fc/src/librustc_ast/util/classify.rs#L7-L25
match *expr {
Expr::Unsafe(..)
| Expr::Block(..)
| Expr::If(..)
| Expr::Match(..)
| Expr::While(..)
| Expr::Loop(..)
| Expr::ForLoop(..)
| Expr::Async(..)
| Expr::TryBlock(..) => false,
_ => true,
}
}
#[cfg(feature = "parsing")]
pub(crate) mod parsing {
use super::*;
#[cfg(feature = "full")]
use crate::parse::ParseBuffer;
use crate::parse::{Parse, ParseStream, Result};
use crate::path;
#[cfg(feature = "full")]
use proc_macro2::TokenTree;
use std::cmp::Ordering;
crate::custom_keyword!(raw);
// When we're parsing expressions which occur before blocks, like in an if
// statement's condition, we cannot parse a struct literal.
//
// Struct literals are ambiguous in certain positions
// https://github.com/rust-lang/rfcs/pull/92
pub struct AllowStruct(bool);
enum Precedence {
Any,
Assign,
Range,
Or,
And,
Compare,
BitOr,
BitXor,
BitAnd,
Shift,
Arithmetic,
Term,
Cast,
}
impl Precedence {
fn of(op: &BinOp) -> Self {
match *op {
BinOp::Add(_) | BinOp::Sub(_) => Precedence::Arithmetic,
BinOp::Mul(_) | BinOp::Div(_) | BinOp::Rem(_) => Precedence::Term,
BinOp::And(_) => Precedence::And,
BinOp::Or(_) => Precedence::Or,
BinOp::BitXor(_) => Precedence::BitXor,
BinOp::BitAnd(_) => Precedence::BitAnd,
BinOp::BitOr(_) => Precedence::BitOr,
BinOp::Shl(_) | BinOp::Shr(_) => Precedence::Shift,
BinOp::Eq(_)
| BinOp::Lt(_)
| BinOp::Le(_)
| BinOp::Ne(_)
| BinOp::Ge(_)
| BinOp::Gt(_) => Precedence::Compare,
BinOp::AddEq(_)
| BinOp::SubEq(_)
| BinOp::MulEq(_)
| BinOp::DivEq(_)
| BinOp::RemEq(_)
| BinOp::BitXorEq(_)
| BinOp::BitAndEq(_)
| BinOp::BitOrEq(_)
| BinOp::ShlEq(_)
| BinOp::ShrEq(_) => Precedence::Assign,
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Expr {
fn parse(input: ParseStream) -> Result<Self> {
ambiguous_expr(input, AllowStruct(true))
}
}
impl Expr {
/// An alternative to the primary `Expr::parse` parser (from the
/// [`Parse`] trait) for ambiguous syntactic positions in which a
/// trailing brace should not be taken as part of the expression.
///
/// Rust grammar has an ambiguity where braces sometimes turn a path
/// expression into a struct initialization and sometimes do not. In the
/// following code, the expression `S {}` is one expression. Presumably
/// there is an empty struct `struct S {}` defined somewhere which it is
/// instantiating.
///
/// ```
/// # struct S;
/// # impl std::ops::Deref for S {
/// # type Target = bool;
/// # fn deref(&self) -> &Self::Target {
/// # &true
/// # }
/// # }
/// let _ = *S {};
///
/// // parsed by rustc as: `*(S {})`
/// ```
///
/// We would want to parse the above using `Expr::parse` after the `=`
/// token.
///
/// But in the following, `S {}` is *not* a struct init expression.
///
/// ```
/// # const S: &bool = &true;
/// if *S {} {}
///
/// // parsed by rustc as:
/// //
/// // if (*S) {
/// // /* empty block */
/// // }
/// // {
/// // /* another empty block */
/// // }
/// ```
///
/// For that reason we would want to parse if-conditions using
/// `Expr::parse_without_eager_brace` after the `if` token. Same for
/// similar syntactic positions such as the condition expr after a
/// `while` token or the expr at the top of a `match`.
///
/// The Rust grammar's choices around which way this ambiguity is
/// resolved at various syntactic positions is fairly arbitrary. Really
/// either parse behavior could work in most positions, and language
/// designers just decide each case based on which is more likely to be
/// what the programmer had in mind most of the time.
///
/// ```
/// # struct S;
/// # fn doc() -> S {
/// if return S {} {}
/// # unreachable!()
/// # }
///
/// // parsed by rustc as:
/// //
/// // if (return (S {})) {
/// // }
/// //
/// // but could equally well have been this other arbitrary choice:
/// //
/// // if (return S) {
/// // }
/// // {}
/// ```
///
/// Note the grammar ambiguity on trailing braces is distinct from
/// precedence and is not captured by assigning a precedence level to
/// the braced struct init expr in relation to other operators. This can
/// be illustrated by `return 0..S {}` vs `match 0..S {}`. The former
/// parses as `return (0..(S {}))` implying tighter precedence for
/// struct init than `..`, while the latter parses as `match (0..S) {}`
/// implying tighter precedence for `..` than struct init, a
/// contradiction.
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(all(feature = "full", feature = "parsing"))))]
pub fn parse_without_eager_brace(input: ParseStream) -> Result<Expr> {
ambiguous_expr(input, AllowStruct(false))
}
}
impl Copy for AllowStruct {}
impl Clone for AllowStruct {
fn clone(&self) -> Self {
*self
}
}
impl Copy for Precedence {}
impl Clone for Precedence {
fn clone(&self) -> Self {
*self
}
}
impl PartialEq for Precedence {
fn eq(&self, other: &Self) -> bool {
*self as u8 == *other as u8
}
}
impl PartialOrd for Precedence {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
let this = *self as u8;
let other = *other as u8;
Some(this.cmp(&other))
}
}
#[cfg(feature = "full")]
fn parse_expr(
input: ParseStream,
mut lhs: Expr,
allow_struct: AllowStruct,
base: Precedence,
) -> Result<Expr> {
loop {
if input
.fork()
.parse::<BinOp>()
.ok()
.map_or(false, |op| Precedence::of(&op) >= base)
{
let op: BinOp = input.parse()?;
let precedence = Precedence::of(&op);
let mut rhs = unary_expr(input, allow_struct)?;
loop {
let next = peek_precedence(input);
if next > precedence || next == precedence && precedence == Precedence::Assign {
rhs = parse_expr(input, rhs, allow_struct, next)?;
} else {
break;
}
}
lhs = if precedence == Precedence::Assign {
Expr::AssignOp(ExprAssignOp {
attrs: Vec::new(),
left: Box::new(lhs),
op,
right: Box::new(rhs),
})
} else {
Expr::Binary(ExprBinary {
attrs: Vec::new(),
left: Box::new(lhs),
op,
right: Box::new(rhs),
})
};
} else if Precedence::Assign >= base
&& input.peek(Token![=])
&& !input.peek(Token![==])
&& !input.peek(Token![=>])
{
let eq_token: Token![=] = input.parse()?;
let mut rhs = unary_expr(input, allow_struct)?;
loop {
let next = peek_precedence(input);
if next >= Precedence::Assign {
rhs = parse_expr(input, rhs, allow_struct, next)?;
} else {
break;
}
}
lhs = Expr::Assign(ExprAssign {
attrs: Vec::new(),
left: Box::new(lhs),
eq_token,
right: Box::new(rhs),
});
} else if Precedence::Range >= base && input.peek(Token![..]) {
let limits: RangeLimits = input.parse()?;
let rhs = if input.is_empty()
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![.]) && !input.peek(Token![..])
|| !allow_struct.0 && input.peek(token::Brace)
{
None
} else {
let mut rhs = unary_expr(input, allow_struct)?;
loop {
let next = peek_precedence(input);
if next > Precedence::Range {
rhs = parse_expr(input, rhs, allow_struct, next)?;
} else {
break;
}
}
Some(rhs)
};
lhs = Expr::Range(ExprRange {
attrs: Vec::new(),
from: Some(Box::new(lhs)),
limits,
to: rhs.map(Box::new),
});
} else if Precedence::Cast >= base && input.peek(Token![as]) {
let as_token: Token![as] = input.parse()?;
let allow_plus = false;
let allow_group_generic = false;
let ty = ty::parsing::ambig_ty(input, allow_plus, allow_group_generic)?;
check_cast(input)?;
lhs = Expr::Cast(ExprCast {
attrs: Vec::new(),
expr: Box::new(lhs),
as_token,
ty: Box::new(ty),
});
} else if Precedence::Cast >= base && input.peek(Token![:]) && !input.peek(Token![::]) {
let colon_token: Token![:] = input.parse()?;
let allow_plus = false;
let allow_group_generic = false;
let ty = ty::parsing::ambig_ty(input, allow_plus, allow_group_generic)?;
check_cast(input)?;
lhs = Expr::Type(ExprType {
attrs: Vec::new(),
expr: Box::new(lhs),
colon_token,
ty: Box::new(ty),
});
} else {
break;
}
}
Ok(lhs)
}
#[cfg(not(feature = "full"))]
fn parse_expr(
input: ParseStream,
mut lhs: Expr,
allow_struct: AllowStruct,
base: Precedence,
) -> Result<Expr> {
loop {
if input
.fork()
.parse::<BinOp>()
.ok()
.map_or(false, |op| Precedence::of(&op) >= base)
{
let op: BinOp = input.parse()?;
let precedence = Precedence::of(&op);
let mut rhs = unary_expr(input, allow_struct)?;
loop {
let next = peek_precedence(input);
if next > precedence || next == precedence && precedence == Precedence::Assign {
rhs = parse_expr(input, rhs, allow_struct, next)?;
} else {
break;
}
}
lhs = Expr::Binary(ExprBinary {
attrs: Vec::new(),
left: Box::new(lhs),
op,
right: Box::new(rhs),
});
} else if Precedence::Cast >= base && input.peek(Token![as]) {
let as_token: Token![as] = input.parse()?;
let allow_plus = false;
let allow_group_generic = false;
let ty = ty::parsing::ambig_ty(input, allow_plus, allow_group_generic)?;
check_cast(input)?;
lhs = Expr::Cast(ExprCast {
attrs: Vec::new(),
expr: Box::new(lhs),
as_token,
ty: Box::new(ty),
});
} else {
break;
}
}
Ok(lhs)
}
fn peek_precedence(input: ParseStream) -> Precedence {
if let Ok(op) = input.fork().parse() {
Precedence::of(&op)
} else if input.peek(Token![=]) && !input.peek(Token![=>]) {
Precedence::Assign
} else if input.peek(Token![..]) {
Precedence::Range
} else if input.peek(Token![as])
|| cfg!(feature = "full") && input.peek(Token![:]) && !input.peek(Token![::])
{
Precedence::Cast
} else {
Precedence::Any
}
}
// Parse an arbitrary expression.
fn ambiguous_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
let lhs = unary_expr(input, allow_struct)?;
parse_expr(input, lhs, allow_struct, Precedence::Any)
}
#[cfg(feature = "full")]
fn expr_attrs(input: ParseStream) -> Result<Vec<Attribute>> {
let mut attrs = Vec::new();
loop {
if input.peek(token::Group) {
let ahead = input.fork();
let group = crate::group::parse_group(&ahead)?;
if !group.content.peek(Token![#]) || group.content.peek2(Token![!]) {
break;
}
let attr = group.content.call(attr::parsing::single_parse_outer)?;
if !group.content.is_empty() {
break;
}
attrs.push(attr);
} else if input.peek(Token![#]) {
attrs.push(input.call(attr::parsing::single_parse_outer)?);
} else {
break;
}
}
Ok(attrs)
}
// <UnOp> <trailer>
// & <trailer>
// &mut <trailer>
// box <trailer>
#[cfg(feature = "full")]
fn unary_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
let begin = input.fork();
let attrs = input.call(expr_attrs)?;
if input.peek(Token![&]) {
let and_token: Token![&] = input.parse()?;
let raw: Option<raw> =
if input.peek(raw) && (input.peek2(Token![mut]) || input.peek2(Token![const])) {
Some(input.parse()?)
} else {
None
};
let mutability: Option<Token![mut]> = input.parse()?;
if raw.is_some() && mutability.is_none() {
input.parse::<Token![const]>()?;
}
let expr = Box::new(unary_expr(input, allow_struct)?);
if raw.is_some() {
Ok(Expr::Verbatim(verbatim::between(begin, input)))
} else {
Ok(Expr::Reference(ExprReference {
attrs,
and_token,
raw: Reserved::default(),
mutability,
expr,
}))
}
} else if input.peek(Token![box]) {
expr_box(input, attrs, allow_struct).map(Expr::Box)
} else if input.peek(Token![*]) || input.peek(Token![!]) || input.peek(Token![-]) {
expr_unary(input, attrs, allow_struct).map(Expr::Unary)
} else {
trailer_expr(begin, attrs, input, allow_struct)
}
}
#[cfg(not(feature = "full"))]
fn unary_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
if input.peek(Token![*]) || input.peek(Token![!]) || input.peek(Token![-]) {
Ok(Expr::Unary(ExprUnary {
attrs: Vec::new(),
op: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
}))
} else {
trailer_expr(input, allow_struct)
}
}
// <atom> (..<args>) ...
// <atom> . <ident> (..<args>) ...
// <atom> . <ident> ...
// <atom> . <lit> ...
// <atom> [ <expr> ] ...
// <atom> ? ...
#[cfg(feature = "full")]
fn trailer_expr(
begin: ParseBuffer,
mut attrs: Vec<Attribute>,
input: ParseStream,
allow_struct: AllowStruct,
) -> Result<Expr> {
let atom = atom_expr(input, allow_struct)?;
let mut e = trailer_helper(input, atom)?;
if let Expr::Verbatim(tokens) = &mut e {
*tokens = verbatim::between(begin, input);
} else {
let inner_attrs = e.replace_attrs(Vec::new());
attrs.extend(inner_attrs);
e.replace_attrs(attrs);
}
Ok(e)
}
#[cfg(feature = "full")]
fn trailer_helper(input: ParseStream, mut e: Expr) -> Result<Expr> {
loop {
if input.peek(token::Paren) {
let content;
e = Expr::Call(ExprCall {
attrs: Vec::new(),
func: Box::new(e),
paren_token: parenthesized!(content in input),
args: content.parse_terminated(Expr::parse)?,
});
} else if input.peek(Token![.])
&& !input.peek(Token![..])
&& match e {
Expr::Range(_) => false,
_ => true,
}
{
let mut dot_token: Token![.] = input.parse()?;
let await_token: Option<token::Await> = input.parse()?;
if let Some(await_token) = await_token {
e = Expr::Await(ExprAwait {
attrs: Vec::new(),
base: Box::new(e),
dot_token,
await_token,
});
continue;
}
let float_token: Option<LitFloat> = input.parse()?;
if let Some(float_token) = float_token {
if multi_index(&mut e, &mut dot_token, float_token)? {
continue;
}
}
let member: Member = input.parse()?;
let turbofish = if member.is_named() && input.peek(Token![::]) {
Some(input.parse::<MethodTurbofish>()?)
} else {
None
};
if turbofish.is_some() || input.peek(token::Paren) {
if let Member::Named(method) = member {
let content;
e = Expr::MethodCall(ExprMethodCall {
attrs: Vec::new(),
receiver: Box::new(e),
dot_token,
method,
turbofish,
paren_token: parenthesized!(content in input),
args: content.parse_terminated(Expr::parse)?,
});
continue;
}
}
e = Expr::Field(ExprField {
attrs: Vec::new(),
base: Box::new(e),
dot_token,
member,
});
} else if input.peek(token::Bracket) {
let content;
e = Expr::Index(ExprIndex {
attrs: Vec::new(),
expr: Box::new(e),
bracket_token: bracketed!(content in input),
index: content.parse()?,
});
} else if input.peek(Token![?]) {
e = Expr::Try(ExprTry {
attrs: Vec::new(),
expr: Box::new(e),
question_token: input.parse()?,
});
} else {
break;
}
}
Ok(e)
}
#[cfg(not(feature = "full"))]
fn trailer_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
let mut e = atom_expr(input, allow_struct)?;
loop {
if input.peek(token::Paren) {
let content;
e = Expr::Call(ExprCall {
attrs: Vec::new(),
func: Box::new(e),
paren_token: parenthesized!(content in input),
args: content.parse_terminated(Expr::parse)?,
});
} else if input.peek(Token![.]) && !input.peek(Token![..]) && !input.peek2(token::Await)
{
let mut dot_token: Token![.] = input.parse()?;
let float_token: Option<LitFloat> = input.parse()?;
if let Some(float_token) = float_token {
if multi_index(&mut e, &mut dot_token, float_token)? {
continue;
}
}
e = Expr::Field(ExprField {
attrs: Vec::new(),
base: Box::new(e),
dot_token,
member: input.parse()?,
});
} else if input.peek(token::Bracket) {
let content;
e = Expr::Index(ExprIndex {
attrs: Vec::new(),
expr: Box::new(e),
bracket_token: bracketed!(content in input),
index: content.parse()?,
});
} else {
break;
}
}
Ok(e)
}
// Parse all atomic expressions which don't have to worry about precedence
// interactions, as they are fully contained.
#[cfg(feature = "full")]
fn atom_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
if input.peek(token::Group)
&& !input.peek2(Token![::])
&& !input.peek2(Token![!])
&& !input.peek2(token::Brace)
{
input.call(expr_group).map(Expr::Group)
} else if input.peek(Lit) {
input.parse().map(Expr::Lit)
} else if input.peek(Token![async])
&& (input.peek2(token::Brace) || input.peek2(Token![move]) && input.peek3(token::Brace))
{
input.parse().map(Expr::Async)
} else if input.peek(Token![try]) && input.peek2(token::Brace) {
input.parse().map(Expr::TryBlock)
} else if input.peek(Token![|])
|| input.peek(Token![async]) && (input.peek2(Token![|]) || input.peek2(Token![move]))
|| input.peek(Token![static])
|| input.peek(Token![move])
{
expr_closure(input, allow_struct).map(Expr::Closure)
} else if input.peek(Token![for])
&& input.peek2(Token![<])
&& (input.peek3(Lifetime) || input.peek3(Token![>]))
{
let begin = input.fork();
input.parse::<BoundLifetimes>()?;
expr_closure(input, allow_struct)?;
let verbatim = verbatim::between(begin, input);
Ok(Expr::Verbatim(verbatim))
} else if input.peek(Ident)
|| input.peek(Token![::])
|| input.peek(Token![<])
|| input.peek(Token![self])
|| input.peek(Token![Self])
|| input.peek(Token![super])
|| input.peek(Token![crate])
{
path_or_macro_or_struct(input, allow_struct)
} else if input.peek(token::Paren) {
paren_or_tuple(input)
} else if input.peek(Token![break]) {
expr_break(input, allow_struct).map(Expr::Break)
} else if input.peek(Token![continue]) {
input.parse().map(Expr::Continue)
} else if input.peek(Token![return]) {
expr_ret(input, allow_struct).map(Expr::Return)
} else if input.peek(token::Bracket) {
array_or_repeat(input)
} else if input.peek(Token![let]) {
input.parse().map(Expr::Let)
} else if input.peek(Token![if]) {
input.parse().map(Expr::If)
} else if input.peek(Token![while]) {
input.parse().map(Expr::While)
} else if input.peek(Token![for]) {
input.parse().map(Expr::ForLoop)
} else if input.peek(Token![loop]) {
input.parse().map(Expr::Loop)
} else if input.peek(Token![match]) {
input.parse().map(Expr::Match)
} else if input.peek(Token![yield]) {
input.parse().map(Expr::Yield)
} else if input.peek(Token![unsafe]) {
input.parse().map(Expr::Unsafe)
} else if input.peek(Token![const]) {
input.call(expr_const).map(Expr::Verbatim)
} else if input.peek(token::Brace) {
input.parse().map(Expr::Block)
} else if input.peek(Token![..]) {
expr_range(input, allow_struct).map(Expr::Range)
} else if input.peek(Token![_]) {
Ok(Expr::Verbatim(TokenStream::from(
input.parse::<TokenTree>()?,
)))
} else if input.peek(Lifetime) {
let the_label: Label = input.parse()?;
let mut expr = if input.peek(Token![while]) {
Expr::While(input.parse()?)
} else if input.peek(Token![for]) {
Expr::ForLoop(input.parse()?)
} else if input.peek(Token![loop]) {
Expr::Loop(input.parse()?)
} else if input.peek(token::Brace) {
Expr::Block(input.parse()?)
} else {
return Err(input.error("expected loop or block expression"));
};
match &mut expr {
Expr::While(ExprWhile { label, .. })
| Expr::ForLoop(ExprForLoop { label, .. })
| Expr::Loop(ExprLoop { label, .. })
| Expr::Block(ExprBlock { label, .. }) => *label = Some(the_label),
_ => unreachable!(),
}
Ok(expr)
} else {
Err(input.error("expected expression"))
}
}
#[cfg(not(feature = "full"))]
fn atom_expr(input: ParseStream, _allow_struct: AllowStruct) -> Result<Expr> {
if input.peek(Lit) {
input.parse().map(Expr::Lit)
} else if input.peek(token::Paren) {
input.call(expr_paren).map(Expr::Paren)
} else if input.peek(Ident)
|| input.peek(Token![::])
|| input.peek(Token![<])
|| input.peek(Token![self])
|| input.peek(Token![Self])
|| input.peek(Token![super])
|| input.peek(Token![crate])
{
input.parse().map(Expr::Path)
} else {
Err(input.error("unsupported expression; enable syn's features=[\"full\"]"))
}
}
#[cfg(feature = "full")]
fn path_or_macro_or_struct(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
let begin = input.fork();
let expr: ExprPath = input.parse()?;
if expr.qself.is_none() && input.peek(Token![!]) && !input.peek(Token![!=]) {
let mut contains_arguments = false;
for segment in &expr.path.segments {
match segment.arguments {
PathArguments::None => {}
PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => {
contains_arguments = true;
}
}
}
if !contains_arguments {
let bang_token: Token![!] = input.parse()?;
let (delimiter, tokens) = mac::parse_delimiter(input)?;
return Ok(Expr::Macro(ExprMacro {
attrs: Vec::new(),
mac: Macro {
path: expr.path,
bang_token,
delimiter,
tokens,
},
}));
}
}
if allow_struct.0 && input.peek(token::Brace) {
let expr_struct = expr_struct_helper(input, expr.path)?;
if expr.qself.is_some() {
Ok(Expr::Verbatim(verbatim::between(begin, input)))
} else {
Ok(Expr::Struct(expr_struct))
}
} else {
Ok(Expr::Path(expr))
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprMacro {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprMacro {
attrs: Vec::new(),
mac: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn paren_or_tuple(input: ParseStream) -> Result<Expr> {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(Expr::Tuple(ExprTuple {
attrs: Vec::new(),
paren_token,
elems: Punctuated::new(),
}));
}
let first: Expr = content.parse()?;
if content.is_empty() {
return Ok(Expr::Paren(ExprParen {
attrs: Vec::new(),
paren_token,
expr: Box::new(first),
}));
}
let mut elems = Punctuated::new();
elems.push_value(first);
while !content.is_empty() {
let punct = content.parse()?;
elems.push_punct(punct);
if content.is_empty() {
break;
}
let value = content.parse()?;
elems.push_value(value);
}
Ok(Expr::Tuple(ExprTuple {
attrs: Vec::new(),
paren_token,
elems,
}))
}
#[cfg(feature = "full")]
fn array_or_repeat(input: ParseStream) -> Result<Expr> {
let content;
let bracket_token = bracketed!(content in input);
if content.is_empty() {
return Ok(Expr::Array(ExprArray {
attrs: Vec::new(),
bracket_token,
elems: Punctuated::new(),
}));
}
let first: Expr = content.parse()?;
if content.is_empty() || content.peek(Token![,]) {
let mut elems = Punctuated::new();
elems.push_value(first);
while !content.is_empty() {
let punct = content.parse()?;
elems.push_punct(punct);
if content.is_empty() {
break;
}
let value = content.parse()?;
elems.push_value(value);
}
Ok(Expr::Array(ExprArray {
attrs: Vec::new(),
bracket_token,
elems,
}))
} else if content.peek(Token![;]) {
let semi_token: Token![;] = content.parse()?;
let len: Expr = content.parse()?;
Ok(Expr::Repeat(ExprRepeat {
attrs: Vec::new(),
bracket_token,
expr: Box::new(first),
semi_token,
len: Box::new(len),
}))
} else {
Err(content.error("expected `,` or `;`"))
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprArray {
fn parse(input: ParseStream) -> Result<Self> {
let content;
let bracket_token = bracketed!(content in input);
let mut elems = Punctuated::new();
while !content.is_empty() {
let first: Expr = content.parse()?;
elems.push_value(first);
if content.is_empty() {
break;
}
let punct = content.parse()?;
elems.push_punct(punct);
}
Ok(ExprArray {
attrs: Vec::new(),
bracket_token,
elems,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprRepeat {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ExprRepeat {
bracket_token: bracketed!(content in input),
attrs: Vec::new(),
expr: content.parse()?,
semi_token: content.parse()?,
len: content.parse()?,
})
}
}
#[cfg(feature = "full")]
pub(crate) fn expr_early(input: ParseStream) -> Result<Expr> {
let mut attrs = input.call(expr_attrs)?;
let mut expr = if input.peek(Token![if]) {
Expr::If(input.parse()?)
} else if input.peek(Token![while]) {
Expr::While(input.parse()?)
} else if input.peek(Token![for])
&& !(input.peek2(Token![<]) && (input.peek3(Lifetime) || input.peek3(Token![>])))
{
Expr::ForLoop(input.parse()?)
} else if input.peek(Token![loop]) {
Expr::Loop(input.parse()?)
} else if input.peek(Token![match]) {
Expr::Match(input.parse()?)
} else if input.peek(Token![try]) && input.peek2(token::Brace) {
Expr::TryBlock(input.parse()?)
} else if input.peek(Token![unsafe]) {
Expr::Unsafe(input.parse()?)
} else if input.peek(Token![const]) {
Expr::Verbatim(input.call(expr_const)?)
} else if input.peek(token::Brace) {
Expr::Block(input.parse()?)
} else {
let allow_struct = AllowStruct(true);
let mut expr = unary_expr(input, allow_struct)?;
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
return parse_expr(input, expr, allow_struct, Precedence::Any);
};
if input.peek(Token![.]) && !input.peek(Token![..]) || input.peek(Token![?]) {
expr = trailer_helper(input, expr)?;
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
let allow_struct = AllowStruct(true);
return parse_expr(input, expr, allow_struct, Precedence::Any);
}
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
Ok(expr)
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLit {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprLit {
attrs: Vec::new(),
lit: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn expr_group(input: ParseStream) -> Result<ExprGroup> {
let group = crate::group::parse_group(input)?;
Ok(ExprGroup {
attrs: Vec::new(),
group_token: group.token,
expr: group.content.parse()?,
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprParen {
fn parse(input: ParseStream) -> Result<Self> {
expr_paren(input)
}
}
fn expr_paren(input: ParseStream) -> Result<ExprParen> {
let content;
Ok(ExprParen {
attrs: Vec::new(),
paren_token: parenthesized!(content in input),
expr: content.parse()?,
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericMethodArgument {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lit) {
let lit = input.parse()?;
return Ok(GenericMethodArgument::Const(Expr::Lit(lit)));
}
if input.peek(token::Brace) {
let block: ExprBlock = input.parse()?;
return Ok(GenericMethodArgument::Const(Expr::Block(block)));
}
input.parse().map(GenericMethodArgument::Type)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for MethodTurbofish {
fn parse(input: ParseStream) -> Result<Self> {
Ok(MethodTurbofish {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value: GenericMethodArgument = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLet {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprLet {
attrs: Vec::new(),
let_token: input.parse()?,
pat: pat::parsing::multi_pat_with_leading_vert(input)?,
eq_token: input.parse()?,
expr: Box::new({
let allow_struct = AllowStruct(false);
let lhs = unary_expr(input, allow_struct)?;
parse_expr(input, lhs, allow_struct, Precedence::Compare)?
}),
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprIf {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
Ok(ExprIf {
attrs,
if_token: input.parse()?,
cond: Box::new(input.call(Expr::parse_without_eager_brace)?),
then_branch: input.parse()?,
else_branch: {
if input.peek(Token![else]) {
Some(input.call(else_block)?)
} else {
None
}
},
})
}
}
#[cfg(feature = "full")]
fn else_block(input: ParseStream) -> Result<(Token![else], Box<Expr>)> {
let else_token: Token![else] = input.parse()?;
let lookahead = input.lookahead1();
let else_branch = if input.peek(Token![if]) {
input.parse().map(Expr::If)?
} else if input.peek(token::Brace) {
Expr::Block(ExprBlock {
attrs: Vec::new(),
label: None,
block: input.parse()?,
})
} else {
return Err(lookahead.error());
};
Ok((else_token, Box::new(else_branch)))
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprForLoop {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let for_token: Token![for] = input.parse()?;
let pat = pat::parsing::multi_pat_with_leading_vert(input)?;
let in_token: Token![in] = input.parse()?;
let expr: Expr = input.call(Expr::parse_without_eager_brace)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprForLoop {
attrs,
label,
for_token,
pat,
in_token,
expr: Box::new(expr),
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLoop {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let loop_token: Token![loop] = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprLoop {
attrs,
label,
loop_token,
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprMatch {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let match_token: Token![match] = input.parse()?;
let expr = Expr::parse_without_eager_brace(input)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut arms = Vec::new();
while !content.is_empty() {
arms.push(content.call(Arm::parse)?);
}
Ok(ExprMatch {
attrs,
match_token,
expr: Box::new(expr),
brace_token,
arms,
})
}
}
macro_rules! impl_by_parsing_expr {
(
$(
$expr_type:ty, $variant:ident, $msg:expr,
)*
) => {
$(
#[cfg(all(feature = "full", feature = "printing"))]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for $expr_type {
fn parse(input: ParseStream) -> Result<Self> {
let mut expr: Expr = input.parse()?;
loop {
match expr {
Expr::$variant(inner) => return Ok(inner),
Expr::Group(next) => expr = *next.expr,
_ => return Err(Error::new_spanned(expr, $msg)),
}
}
}
}
)*
};
}
impl_by_parsing_expr! {
ExprAssign, Assign, "expected assignment expression",
ExprAssignOp, AssignOp, "expected compound assignment expression",
ExprAwait, Await, "expected await expression",
ExprBinary, Binary, "expected binary operation",
ExprCall, Call, "expected function call expression",
ExprCast, Cast, "expected cast expression",
ExprField, Field, "expected struct field access",
ExprIndex, Index, "expected indexing expression",
ExprMethodCall, MethodCall, "expected method call expression",
ExprRange, Range, "expected range expression",
ExprTry, Try, "expected try expression",
ExprTuple, Tuple, "expected tuple expression",
ExprType, Type, "expected type ascription expression",
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprBox {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = Vec::new();
let allow_struct = AllowStruct(true);
expr_box(input, attrs, allow_struct)
}
}
#[cfg(feature = "full")]
fn expr_box(
input: ParseStream,
attrs: Vec<Attribute>,
allow_struct: AllowStruct,
) -> Result<ExprBox> {
Ok(ExprBox {
attrs,
box_token: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprUnary {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = Vec::new();
let allow_struct = AllowStruct(true);
expr_unary(input, attrs, allow_struct)
}
}
#[cfg(feature = "full")]
fn expr_unary(
input: ParseStream,
attrs: Vec<Attribute>,
allow_struct: AllowStruct,
) -> Result<ExprUnary> {
Ok(ExprUnary {
attrs,
op: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprClosure {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_closure(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprReference {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
Ok(ExprReference {
attrs: Vec::new(),
and_token: input.parse()?,
raw: Reserved::default(),
mutability: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprBreak {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_break(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprReturn {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_ret(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprTryBlock {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprTryBlock {
attrs: Vec::new(),
try_token: input.parse()?,
block: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprYield {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprYield {
attrs: Vec::new(),
yield_token: input.parse()?,
expr: {
if !input.is_empty() && !input.peek(Token![,]) && !input.peek(Token![;]) {
Some(input.parse()?)
} else {
None
}
},
})
}
}
#[cfg(feature = "full")]
fn expr_closure(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprClosure> {
let movability: Option<Token![static]> = input.parse()?;
let asyncness: Option<Token![async]> = input.parse()?;
let capture: Option<Token![move]> = input.parse()?;
let or1_token: Token![|] = input.parse()?;
let mut inputs = Punctuated::new();
loop {
if input.peek(Token![|]) {
break;
}
let value = closure_arg(input)?;
inputs.push_value(value);
if input.peek(Token![|]) {
break;
}
let punct: Token![,] = input.parse()?;
inputs.push_punct(punct);
}
let or2_token: Token![|] = input.parse()?;
let (output, body) = if input.peek(Token![->]) {
let arrow_token: Token![->] = input.parse()?;
let ty: Type = input.parse()?;
let body: Block = input.parse()?;
let output = ReturnType::Type(arrow_token, Box::new(ty));
let block = Expr::Block(ExprBlock {
attrs: Vec::new(),
label: None,
block: body,
});
(output, block)
} else {
let body = ambiguous_expr(input, allow_struct)?;
(ReturnType::Default, body)
};
Ok(ExprClosure {
attrs: Vec::new(),
movability,
asyncness,
capture,
or1_token,
inputs,
or2_token,
output,
body: Box::new(body),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprAsync {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprAsync {
attrs: Vec::new(),
async_token: input.parse()?,
capture: input.parse()?,
block: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn closure_arg(input: ParseStream) -> Result<Pat> {
let attrs = input.call(Attribute::parse_outer)?;
let mut pat: Pat = input.parse()?;
if input.peek(Token![:]) {
Ok(Pat::Type(PatType {
attrs,
pat: Box::new(pat),
colon_token: input.parse()?,
ty: input.parse()?,
}))
} else {
match &mut pat {
Pat::Box(pat) => pat.attrs = attrs,
Pat::Ident(pat) => pat.attrs = attrs,
Pat::Lit(pat) => pat.attrs = attrs,
Pat::Macro(pat) => pat.attrs = attrs,
Pat::Or(pat) => pat.attrs = attrs,
Pat::Path(pat) => pat.attrs = attrs,
Pat::Range(pat) => pat.attrs = attrs,
Pat::Reference(pat) => pat.attrs = attrs,
Pat::Rest(pat) => pat.attrs = attrs,
Pat::Slice(pat) => pat.attrs = attrs,
Pat::Struct(pat) => pat.attrs = attrs,
Pat::Tuple(pat) => pat.attrs = attrs,
Pat::TupleStruct(pat) => pat.attrs = attrs,
Pat::Type(_) => unreachable!(),
Pat::Verbatim(_) => {}
Pat::Wild(pat) => pat.attrs = attrs,
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
Ok(pat)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprWhile {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let while_token: Token![while] = input.parse()?;
let cond = Expr::parse_without_eager_brace(input)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprWhile {
attrs,
label,
while_token,
cond: Box::new(cond),
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Label {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Label {
name: input.parse()?,
colon_token: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<Label> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprContinue {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprContinue {
attrs: Vec::new(),
continue_token: input.parse()?,
label: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn expr_break(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprBreak> {
Ok(ExprBreak {
attrs: Vec::new(),
break_token: input.parse()?,
label: input.parse()?,
expr: {
if input.is_empty()
|| input.peek(Token![,])
|| input.peek(Token![;])
|| !allow_struct.0 && input.peek(token::Brace)
{
None
} else {
let expr = ambiguous_expr(input, allow_struct)?;
Some(Box::new(expr))
}
},
})
}
#[cfg(feature = "full")]
fn expr_ret(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprReturn> {
Ok(ExprReturn {
attrs: Vec::new(),
return_token: input.parse()?,
expr: {
if input.is_empty() || input.peek(Token![,]) || input.peek(Token![;]) {
None
} else {
// NOTE: return is greedy and eats blocks after it even when in a
// position where structs are not allowed, such as in if statement
// conditions. For example:
//
// if return { println!("A") } {} // Prints "A"
let expr = ambiguous_expr(input, allow_struct)?;
Some(Box::new(expr))
}
},
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for FieldValue {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let member: Member = input.parse()?;
let (colon_token, value) = if input.peek(Token![:]) || !member.is_named() {
let colon_token: Token![:] = input.parse()?;
let value: Expr = input.parse()?;
(Some(colon_token), value)
} else if let Member::Named(ident) = &member {
let value = Expr::Path(ExprPath {
attrs: Vec::new(),
qself: None,
path: Path::from(ident.clone()),
});
(None, value)
} else {
unreachable!()
};
Ok(FieldValue {
attrs,
member,
colon_token,
expr: value,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprStruct {
fn parse(input: ParseStream) -> Result<Self> {
let path: Path = input.parse()?;
expr_struct_helper(input, path)
}
}
#[cfg(feature = "full")]
fn expr_struct_helper(input: ParseStream, path: Path) -> Result<ExprStruct> {
let content;
let brace_token = braced!(content in input);
let mut fields = Punctuated::new();
while !content.is_empty() {
if content.peek(Token![..]) {
return Ok(ExprStruct {
attrs: Vec::new(),
brace_token,
path,
fields,
dot2_token: Some(content.parse()?),
rest: if content.is_empty() {
None
} else {
Some(Box::new(content.parse()?))
},
});
}
fields.push(content.parse()?);
if content.is_empty() {
break;
}
let punct: Token![,] = content.parse()?;
fields.push_punct(punct);
}
Ok(ExprStruct {
attrs: Vec::new(),
brace_token,
path,
fields,
dot2_token: None,
rest: None,
})
}src/path.rs (line 23)
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fn from(segment: T) -> Self {
let mut path = Path {
leading_colon: None,
segments: Punctuated::new(),
};
path.segments.push_value(segment.into());
path
}
}
ast_struct! {
/// A segment of a path together with any path arguments on that segment.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct PathSegment {
pub ident: Ident,
pub arguments: PathArguments,
}
}
impl<T> From<T> for PathSegment
where
T: Into<Ident>,
{
fn from(ident: T) -> Self {
PathSegment {
ident: ident.into(),
arguments: PathArguments::None,
}
}
}
ast_enum! {
/// Angle bracketed or parenthesized arguments of a path segment.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
///
/// ## Angle bracketed
///
/// The `<'a, T>` in `std::slice::iter<'a, T>`.
///
/// ## Parenthesized
///
/// The `(A, B) -> C` in `Fn(A, B) -> C`.
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum PathArguments {
None,
/// The `<'a, T>` in `std::slice::iter<'a, T>`.
AngleBracketed(AngleBracketedGenericArguments),
/// The `(A, B) -> C` in `Fn(A, B) -> C`.
Parenthesized(ParenthesizedGenericArguments),
}
}
impl Default for PathArguments {
fn default() -> Self {
PathArguments::None
}
}
impl PathArguments {
pub fn is_empty(&self) -> bool {
match self {
PathArguments::None => true,
PathArguments::AngleBracketed(bracketed) => bracketed.args.is_empty(),
PathArguments::Parenthesized(_) => false,
}
}
pub fn is_none(&self) -> bool {
match self {
PathArguments::None => true,
PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => false,
}
}
}
ast_enum! {
/// An individual generic argument, like `'a`, `T`, or `Item = T`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum GenericArgument {
/// A lifetime argument.
Lifetime(Lifetime),
/// A type argument.
Type(Type),
/// A const expression. Must be inside of a block.
///
/// NOTE: Identity expressions are represented as Type arguments, as
/// they are indistinguishable syntactically.
Const(Expr),
/// A binding (equality constraint) on an associated type: the `Item =
/// u8` in `Iterator<Item = u8>`.
Binding(Binding),
/// An associated type bound: `Iterator<Item: Display>`.
Constraint(Constraint),
}
}
ast_struct! {
/// Angle bracketed arguments of a path segment: the `<K, V>` in `HashMap<K,
/// V>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct AngleBracketedGenericArguments {
pub colon2_token: Option<Token![::]>,
pub lt_token: Token![<],
pub args: Punctuated<GenericArgument, Token![,]>,
pub gt_token: Token![>],
}
}
ast_struct! {
/// A binding (equality constraint) on an associated type: `Item = u8`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct Binding {
pub ident: Ident,
pub eq_token: Token![=],
pub ty: Type,
}
}
ast_struct! {
/// An associated type bound: `Iterator<Item: Display>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct Constraint {
pub ident: Ident,
pub colon_token: Token![:],
pub bounds: Punctuated<TypeParamBound, Token![+]>,
}
}
ast_struct! {
/// Arguments of a function path segment: the `(A, B) -> C` in `Fn(A,B) ->
/// C`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct ParenthesizedGenericArguments {
pub paren_token: token::Paren,
/// `(A, B)`
pub inputs: Punctuated<Type, Token![,]>,
/// `C`
pub output: ReturnType,
}
}
ast_struct! {
/// The explicit Self type in a qualified path: the `T` in `<T as
/// Display>::fmt`.
///
/// The actual path, including the trait and the associated item, is stored
/// separately. The `position` field represents the index of the associated
/// item qualified with this Self type.
///
/// ```text
/// <Vec<T> as a::b::Trait>::AssociatedItem
/// ^~~~~~ ~~~~~~~~~~~~~~^
/// ty position = 3
///
/// <Vec<T>>::AssociatedItem
/// ^~~~~~ ^
/// ty position = 0
/// ```
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct QSelf {
pub lt_token: Token![<],
pub ty: Box<Type>,
pub position: usize,
pub as_token: Option<Token![as]>,
pub gt_token: Token![>],
}
}
#[cfg(feature = "parsing")]
pub mod parsing {
use super::*;
use crate::ext::IdentExt;
use crate::parse::{Parse, ParseStream, Result};
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Path {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericArgument {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) && !input.peek2(Token![+]) {
return Ok(GenericArgument::Lifetime(input.parse()?));
}
if input.peek(Ident) && input.peek2(Token![=]) {
let ident: Ident = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let ty = if input.peek(Lit) {
let begin = input.fork();
input.parse::<Lit>()?;
Type::Verbatim(verbatim::between(begin, input))
} else if input.peek(token::Brace) {
let begin = input.fork();
#[cfg(feature = "full")]
{
input.parse::<ExprBlock>()?;
}
#[cfg(not(feature = "full"))]
{
let content;
braced!(content in input);
content.parse::<Expr>()?;
}
Type::Verbatim(verbatim::between(begin, input))
} else {
input.parse()?
};
return Ok(GenericArgument::Binding(Binding {
ident,
eq_token,
ty,
}));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) && input.peek2(Token![:]) && !input.peek2(Token![::]) {
return Ok(GenericArgument::Constraint(input.parse()?));
}
}
if input.peek(Lit) || input.peek(token::Brace) {
return const_argument(input).map(GenericArgument::Const);
}
#[cfg(feature = "full")]
let begin = input.fork();
let argument: Type = input.parse()?;
#[cfg(feature = "full")]
{
if match &argument {
Type::Path(argument)
if argument.qself.is_none()
&& argument.path.leading_colon.is_none()
&& argument.path.segments.len() == 1 =>
{
match argument.path.segments[0].arguments {
PathArguments::AngleBracketed(_) => true,
_ => false,
}
}
_ => false,
} && if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
input.parse::<Type>()?;
true
} else if input.peek(Token![:]) {
input.parse::<Token![:]>()?;
input.call(constraint_bounds)?;
true
} else {
false
} {
let verbatim = verbatim::between(begin, input);
return Ok(GenericArgument::Type(Type::Verbatim(verbatim)));
}
}
Ok(GenericArgument::Type(argument))
}
}
pub fn const_argument(input: ParseStream) -> Result<Expr> {
let lookahead = input.lookahead1();
if input.peek(Lit) {
let lit = input.parse()?;
return Ok(Expr::Lit(lit));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) {
let ident: Ident = input.parse()?;
return Ok(Expr::Path(ExprPath {
attrs: Vec::new(),
qself: None,
path: Path::from(ident),
}));
}
}
if input.peek(token::Brace) {
#[cfg(feature = "full")]
{
let block: ExprBlock = input.parse()?;
return Ok(Expr::Block(block));
}
#[cfg(not(feature = "full"))]
{
let begin = input.fork();
let content;
braced!(content in input);
content.parse::<Expr>()?;
let verbatim = verbatim::between(begin, input);
return Ok(Expr::Verbatim(verbatim));
}
}
Err(lookahead.error())
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for AngleBracketedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
Ok(AngleBracketedGenericArguments {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ParenthesizedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ParenthesizedGenericArguments {
paren_token: parenthesized!(content in input),
inputs: content.parse_terminated(Type::parse)?,
output: input.call(ReturnType::without_plus)?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for PathSegment {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
impl PathSegment {
fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
if input.peek(Token![super]) || input.peek(Token![self]) || input.peek(Token![crate]) {
let ident = input.call(Ident::parse_any)?;
return Ok(PathSegment::from(ident));
}
let ident = if input.peek(Token![Self]) {
input.call(Ident::parse_any)?
} else {
input.parse()?
};
if !expr_style && input.peek(Token![<]) && !input.peek(Token![<=])
|| input.peek(Token![::]) && input.peek3(Token![<])
{
Ok(PathSegment {
ident,
arguments: PathArguments::AngleBracketed(input.parse()?),
})
} else {
Ok(PathSegment::from(ident))
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Binding {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Binding {
ident: input.parse()?,
eq_token: input.parse()?,
ty: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Constraint {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Constraint {
ident: input.parse()?,
colon_token: input.parse()?,
bounds: constraint_bounds(input)?,
})
}
}
#[cfg(feature = "full")]
fn constraint_bounds(input: ParseStream) -> Result<Punctuated<TypeParamBound, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
Ok(bounds)
}
impl Path {
/// Parse a `Path` containing no path arguments on any of its segments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Path, Result, Token};
/// use syn::parse::{Parse, ParseStream};
///
/// // A simplified single `use` statement like:
/// //
/// // use std::collections::HashMap;
/// //
/// // Note that generic parameters are not allowed in a `use` statement
/// // so the following must not be accepted.
/// //
/// // use a::<b>::c;
/// struct SingleUse {
/// use_token: Token![use],
/// path: Path,
/// }
///
/// impl Parse for SingleUse {
/// fn parse(input: ParseStream) -> Result<Self> {
/// Ok(SingleUse {
/// use_token: input.parse()?,
/// path: input.call(Path::parse_mod_style)?,
/// })
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_mod_style(input: ParseStream) -> Result<Self> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
loop {
if !input.peek(Ident)
&& !input.peek(Token![super])
&& !input.peek(Token![self])
&& !input.peek(Token![Self])
&& !input.peek(Token![crate])
{
break;
}
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}
/// Determines whether this is a path of length 1 equal to the given
/// ident.
///
/// For them to compare equal, it must be the case that:
///
/// - the path has no leading colon,
/// - the number of path segments is 1,
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments, and
/// - the ident of the first path segment is equal to the given one.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Attribute, Error, Meta, NestedMeta, Result};
/// # use std::iter::FromIterator;
///
/// fn get_serde_meta_items(attr: &Attribute) -> Result<Vec<NestedMeta>> {
/// if attr.path.is_ident("serde") {
/// match attr.parse_meta()? {
/// Meta::List(meta) => Ok(Vec::from_iter(meta.nested)),
/// bad => Err(Error::new_spanned(bad, "unrecognized attribute")),
/// }
/// } else {
/// Ok(Vec::new())
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn is_ident<I: ?Sized>(&self, ident: &I) -> bool
where
Ident: PartialEq<I>,
{
match self.get_ident() {
Some(id) => id == ident,
None => false,
}
}
/// If this path consists of a single ident, returns the ident.
///
/// A path is considered an ident if:
///
/// - the path has no leading colon,
/// - the number of path segments is 1, and
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn get_ident(&self) -> Option<&Ident> {
if self.leading_colon.is_none()
&& self.segments.len() == 1
&& self.segments[0].arguments.is_none()
{
Some(&self.segments[0].ident)
} else {
None
}
}
pub(crate) fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
let mut path = Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
let value = PathSegment::parse_helper(input, expr_style)?;
segments.push_value(value);
segments
},
};
Path::parse_rest(input, &mut path, expr_style)?;
Ok(path)
}
pub(crate) fn parse_rest(
input: ParseStream,
path: &mut Self,
expr_style: bool,
) -> Result<()> {
while input.peek(Token![::]) && !input.peek3(token::Paren) {
let punct: Token![::] = input.parse()?;
path.segments.push_punct(punct);
let value = PathSegment::parse_helper(input, expr_style)?;
path.segments.push_value(value);
}
Ok(())
}
}
pub fn qpath(input: ParseStream, expr_style: bool) -> Result<(Option<QSelf>, Path)> {
if input.peek(Token![<]) {
let lt_token: Token![<] = input.parse()?;
let this: Type = input.parse()?;
let path = if input.peek(Token![as]) {
let as_token: Token![as] = input.parse()?;
let path: Path = input.parse()?;
Some((as_token, path))
} else {
None
};
let gt_token: Token![>] = input.parse()?;
let colon2_token: Token![::] = input.parse()?;
let mut rest = Punctuated::new();
loop {
let path = PathSegment::parse_helper(input, expr_style)?;
rest.push_value(path);
if !input.peek(Token![::]) {
break;
}
let punct: Token![::] = input.parse()?;
rest.push_punct(punct);
}
let (position, as_token, path) = match path {
Some((as_token, mut path)) => {
let pos = path.segments.len();
path.segments.push_punct(colon2_token);
path.segments.extend(rest.into_pairs());
(pos, Some(as_token), path)
}
None => {
let path = Path {
leading_colon: Some(colon2_token),
segments: rest,
};
(0, None, path)
}
};
let qself = QSelf {
lt_token,
ty: Box::new(this),
position,
as_token,
gt_token,
};
Ok((Some(qself), path))
} else {
let path = Path::parse_helper(input, expr_style)?;
Ok((None, path))
}
}src/punctuated.rs (line 296)
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pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
}
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<T, P> Clone for Punctuated<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
Punctuated {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Eq for Punctuated<T, P>
where
T: Eq,
P: Eq,
{
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> PartialEq for Punctuated<T, P>
where
T: PartialEq,
P: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
let Punctuated { inner, last } = self;
*inner == other.inner && *last == other.last
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Hash for Punctuated<T, P>
where
T: Hash,
P: Hash,
{
fn hash<H: Hasher>(&self, state: &mut H) {
let Punctuated { inner, last } = self;
inner.hash(state);
last.hash(state);
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut list = f.debug_list();
for (t, p) in &self.inner {
list.entry(t);
list.entry(p);
}
if let Some(last) = &self.last {
list.entry(last);
}
list.finish()
}
}
impl<T, P> FromIterator<T> for Punctuated<T, P>
where
P: Default,
{
fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<T> for Punctuated<T, P>
where
P: Default,
{
fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
for value in i {
self.push(value);
}
}
}
impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P> {
fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P> {
fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {
assert!(
self.empty_or_trailing(),
"Punctuated::extend: Punctuated is not empty or does not have a trailing punctuation",
);
let mut nomore = false;
for pair in i {
if nomore {
panic!("Punctuated extended with items after a Pair::End");
}
match pair {
Pair::Punctuated(a, b) => self.inner.push((a, b)),
Pair::End(a) => {
self.last = Some(Box::new(a));
nomore = true;
}
}
}
}
}
impl<T, P> IntoIterator for Punctuated<T, P> {
type Item = T;
type IntoIter = IntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
let mut elements = Vec::with_capacity(self.len());
elements.extend(self.inner.into_iter().map(|pair| pair.0));
elements.extend(self.last.map(|t| *t));
IntoIter {
inner: elements.into_iter(),
}
}
}
impl<'a, T, P> IntoIterator for &'a Punctuated<T, P> {
type Item = &'a T;
type IntoIter = Iter<'a, T>;
fn into_iter(self) -> Self::IntoIter {
Punctuated::iter(self)
}
}
impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P> {
type Item = &'a mut T;
type IntoIter = IterMut<'a, T>;
fn into_iter(self) -> Self::IntoIter {
Punctuated::iter_mut(self)
}
}
impl<T, P> Default for Punctuated<T, P> {
fn default() -> Self {
Punctuated::new()
}src/attr.rs (line 537)
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fn parse_meta_path(input: ParseStream) -> Result<Path> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
while input.peek(Ident::peek_any) {
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}Additional examples can be found in:
sourcepub fn is_empty(&self) -> bool
pub fn is_empty(&self) -> bool
Determines whether this punctuated sequence is empty, meaning it contains no syntax tree nodes or punctuation.
Examples found in repository?
More examples
src/path.rs (line 87)
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pub fn is_empty(&self) -> bool {
match self {
PathArguments::None => true,
PathArguments::AngleBracketed(bracketed) => bracketed.args.is_empty(),
PathArguments::Parenthesized(_) => false,
}
}
pub fn is_none(&self) -> bool {
match self {
PathArguments::None => true,
PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => false,
}
}
}
ast_enum! {
/// An individual generic argument, like `'a`, `T`, or `Item = T`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum GenericArgument {
/// A lifetime argument.
Lifetime(Lifetime),
/// A type argument.
Type(Type),
/// A const expression. Must be inside of a block.
///
/// NOTE: Identity expressions are represented as Type arguments, as
/// they are indistinguishable syntactically.
Const(Expr),
/// A binding (equality constraint) on an associated type: the `Item =
/// u8` in `Iterator<Item = u8>`.
Binding(Binding),
/// An associated type bound: `Iterator<Item: Display>`.
Constraint(Constraint),
}
}
ast_struct! {
/// Angle bracketed arguments of a path segment: the `<K, V>` in `HashMap<K,
/// V>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct AngleBracketedGenericArguments {
pub colon2_token: Option<Token![::]>,
pub lt_token: Token![<],
pub args: Punctuated<GenericArgument, Token![,]>,
pub gt_token: Token![>],
}
}
ast_struct! {
/// A binding (equality constraint) on an associated type: `Item = u8`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct Binding {
pub ident: Ident,
pub eq_token: Token![=],
pub ty: Type,
}
}
ast_struct! {
/// An associated type bound: `Iterator<Item: Display>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct Constraint {
pub ident: Ident,
pub colon_token: Token![:],
pub bounds: Punctuated<TypeParamBound, Token![+]>,
}
}
ast_struct! {
/// Arguments of a function path segment: the `(A, B) -> C` in `Fn(A,B) ->
/// C`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct ParenthesizedGenericArguments {
pub paren_token: token::Paren,
/// `(A, B)`
pub inputs: Punctuated<Type, Token![,]>,
/// `C`
pub output: ReturnType,
}
}
ast_struct! {
/// The explicit Self type in a qualified path: the `T` in `<T as
/// Display>::fmt`.
///
/// The actual path, including the trait and the associated item, is stored
/// separately. The `position` field represents the index of the associated
/// item qualified with this Self type.
///
/// ```text
/// <Vec<T> as a::b::Trait>::AssociatedItem
/// ^~~~~~ ~~~~~~~~~~~~~~^
/// ty position = 3
///
/// <Vec<T>>::AssociatedItem
/// ^~~~~~ ^
/// ty position = 0
/// ```
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct QSelf {
pub lt_token: Token![<],
pub ty: Box<Type>,
pub position: usize,
pub as_token: Option<Token![as]>,
pub gt_token: Token![>],
}
}
#[cfg(feature = "parsing")]
pub mod parsing {
use super::*;
use crate::ext::IdentExt;
use crate::parse::{Parse, ParseStream, Result};
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Path {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericArgument {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) && !input.peek2(Token![+]) {
return Ok(GenericArgument::Lifetime(input.parse()?));
}
if input.peek(Ident) && input.peek2(Token![=]) {
let ident: Ident = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let ty = if input.peek(Lit) {
let begin = input.fork();
input.parse::<Lit>()?;
Type::Verbatim(verbatim::between(begin, input))
} else if input.peek(token::Brace) {
let begin = input.fork();
#[cfg(feature = "full")]
{
input.parse::<ExprBlock>()?;
}
#[cfg(not(feature = "full"))]
{
let content;
braced!(content in input);
content.parse::<Expr>()?;
}
Type::Verbatim(verbatim::between(begin, input))
} else {
input.parse()?
};
return Ok(GenericArgument::Binding(Binding {
ident,
eq_token,
ty,
}));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) && input.peek2(Token![:]) && !input.peek2(Token![::]) {
return Ok(GenericArgument::Constraint(input.parse()?));
}
}
if input.peek(Lit) || input.peek(token::Brace) {
return const_argument(input).map(GenericArgument::Const);
}
#[cfg(feature = "full")]
let begin = input.fork();
let argument: Type = input.parse()?;
#[cfg(feature = "full")]
{
if match &argument {
Type::Path(argument)
if argument.qself.is_none()
&& argument.path.leading_colon.is_none()
&& argument.path.segments.len() == 1 =>
{
match argument.path.segments[0].arguments {
PathArguments::AngleBracketed(_) => true,
_ => false,
}
}
_ => false,
} && if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
input.parse::<Type>()?;
true
} else if input.peek(Token![:]) {
input.parse::<Token![:]>()?;
input.call(constraint_bounds)?;
true
} else {
false
} {
let verbatim = verbatim::between(begin, input);
return Ok(GenericArgument::Type(Type::Verbatim(verbatim)));
}
}
Ok(GenericArgument::Type(argument))
}
}
pub fn const_argument(input: ParseStream) -> Result<Expr> {
let lookahead = input.lookahead1();
if input.peek(Lit) {
let lit = input.parse()?;
return Ok(Expr::Lit(lit));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) {
let ident: Ident = input.parse()?;
return Ok(Expr::Path(ExprPath {
attrs: Vec::new(),
qself: None,
path: Path::from(ident),
}));
}
}
if input.peek(token::Brace) {
#[cfg(feature = "full")]
{
let block: ExprBlock = input.parse()?;
return Ok(Expr::Block(block));
}
#[cfg(not(feature = "full"))]
{
let begin = input.fork();
let content;
braced!(content in input);
content.parse::<Expr>()?;
let verbatim = verbatim::between(begin, input);
return Ok(Expr::Verbatim(verbatim));
}
}
Err(lookahead.error())
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for AngleBracketedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
Ok(AngleBracketedGenericArguments {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ParenthesizedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ParenthesizedGenericArguments {
paren_token: parenthesized!(content in input),
inputs: content.parse_terminated(Type::parse)?,
output: input.call(ReturnType::without_plus)?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for PathSegment {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
impl PathSegment {
fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
if input.peek(Token![super]) || input.peek(Token![self]) || input.peek(Token![crate]) {
let ident = input.call(Ident::parse_any)?;
return Ok(PathSegment::from(ident));
}
let ident = if input.peek(Token![Self]) {
input.call(Ident::parse_any)?
} else {
input.parse()?
};
if !expr_style && input.peek(Token![<]) && !input.peek(Token![<=])
|| input.peek(Token![::]) && input.peek3(Token![<])
{
Ok(PathSegment {
ident,
arguments: PathArguments::AngleBracketed(input.parse()?),
})
} else {
Ok(PathSegment::from(ident))
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Binding {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Binding {
ident: input.parse()?,
eq_token: input.parse()?,
ty: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Constraint {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Constraint {
ident: input.parse()?,
colon_token: input.parse()?,
bounds: constraint_bounds(input)?,
})
}
}
#[cfg(feature = "full")]
fn constraint_bounds(input: ParseStream) -> Result<Punctuated<TypeParamBound, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
Ok(bounds)
}
impl Path {
/// Parse a `Path` containing no path arguments on any of its segments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Path, Result, Token};
/// use syn::parse::{Parse, ParseStream};
///
/// // A simplified single `use` statement like:
/// //
/// // use std::collections::HashMap;
/// //
/// // Note that generic parameters are not allowed in a `use` statement
/// // so the following must not be accepted.
/// //
/// // use a::<b>::c;
/// struct SingleUse {
/// use_token: Token![use],
/// path: Path,
/// }
///
/// impl Parse for SingleUse {
/// fn parse(input: ParseStream) -> Result<Self> {
/// Ok(SingleUse {
/// use_token: input.parse()?,
/// path: input.call(Path::parse_mod_style)?,
/// })
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_mod_style(input: ParseStream) -> Result<Self> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
loop {
if !input.peek(Ident)
&& !input.peek(Token![super])
&& !input.peek(Token![self])
&& !input.peek(Token![Self])
&& !input.peek(Token![crate])
{
break;
}
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}src/attr.rs (line 547)
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fn parse_meta_path(input: ParseStream) -> Result<Path> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
while input.peek(Ident::peek_any) {
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}src/generics.rs (line 1060)
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fn to_tokens(&self, tokens: &mut TokenStream) {
if self.params.is_empty() {
return;
}
TokensOrDefault(&self.lt_token).to_tokens(tokens);
// Print lifetimes before types and consts, regardless of their
// order in self.params.
//
// TODO: ordering rules for const parameters vs type parameters have
// not been settled yet. https://github.com/rust-lang/rust/issues/44580
let mut trailing_or_empty = true;
for param in self.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
}
for param in self.params.pairs() {
match **param.value() {
GenericParam::Type(_) | GenericParam::Const(_) => {
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
trailing_or_empty = true;
}
param.to_tokens(tokens);
}
GenericParam::Lifetime(_) => {}
}
}
TokensOrDefault(&self.gt_token).to_tokens(tokens);
}
}
impl<'a> ToTokens for ImplGenerics<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if self.0.params.is_empty() {
return;
}
TokensOrDefault(&self.0.lt_token).to_tokens(tokens);
// Print lifetimes before types and consts, regardless of their
// order in self.params.
//
// TODO: ordering rules for const parameters vs type parameters have
// not been settled yet. https://github.com/rust-lang/rust/issues/44580
let mut trailing_or_empty = true;
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
}
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
continue;
}
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
trailing_or_empty = true;
}
match *param.value() {
GenericParam::Lifetime(_) => unreachable!(),
GenericParam::Type(param) => {
// Leave off the type parameter defaults
tokens.append_all(param.attrs.outer());
param.ident.to_tokens(tokens);
if !param.bounds.is_empty() {
TokensOrDefault(¶m.colon_token).to_tokens(tokens);
param.bounds.to_tokens(tokens);
}
}
GenericParam::Const(param) => {
// Leave off the const parameter defaults
tokens.append_all(param.attrs.outer());
param.const_token.to_tokens(tokens);
param.ident.to_tokens(tokens);
param.colon_token.to_tokens(tokens);
param.ty.to_tokens(tokens);
}
}
param.punct().to_tokens(tokens);
}
TokensOrDefault(&self.0.gt_token).to_tokens(tokens);
}
}
impl<'a> ToTokens for TypeGenerics<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if self.0.params.is_empty() {
return;
}
TokensOrDefault(&self.0.lt_token).to_tokens(tokens);
// Print lifetimes before types and consts, regardless of their
// order in self.params.
//
// TODO: ordering rules for const parameters vs type parameters have
// not been settled yet. https://github.com/rust-lang/rust/issues/44580
let mut trailing_or_empty = true;
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(def) = *param.value() {
// Leave off the lifetime bounds and attributes
def.lifetime.to_tokens(tokens);
param.punct().to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
}
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
continue;
}
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
trailing_or_empty = true;
}
match *param.value() {
GenericParam::Lifetime(_) => unreachable!(),
GenericParam::Type(param) => {
// Leave off the type parameter defaults
param.ident.to_tokens(tokens);
}
GenericParam::Const(param) => {
// Leave off the const parameter defaults
param.ident.to_tokens(tokens);
}
}
param.punct().to_tokens(tokens);
}
TokensOrDefault(&self.0.gt_token).to_tokens(tokens);
}
}
impl<'a> ToTokens for Turbofish<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if !self.0.params.is_empty() {
<Token![::]>::default().to_tokens(tokens);
TypeGenerics(self.0).to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for BoundLifetimes {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.for_token.to_tokens(tokens);
self.lt_token.to_tokens(tokens);
self.lifetimes.to_tokens(tokens);
self.gt_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for LifetimeDef {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.lifetime.to_tokens(tokens);
if !self.bounds.is_empty() {
TokensOrDefault(&self.colon_token).to_tokens(tokens);
self.bounds.to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TypeParam {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.ident.to_tokens(tokens);
if !self.bounds.is_empty() {
TokensOrDefault(&self.colon_token).to_tokens(tokens);
self.bounds.to_tokens(tokens);
}
if let Some(default) = &self.default {
#[cfg(feature = "full")]
{
if self.eq_token.is_none() {
if let Type::Verbatim(default) = default {
let mut iter = default.clone().into_iter().peekable();
while let Some(token) = iter.next() {
if let TokenTree::Punct(q) = token {
if q.as_char() == '~' {
if let Some(TokenTree::Ident(c)) = iter.peek() {
if c == "const" {
if self.bounds.is_empty() {
TokensOrDefault(&self.colon_token)
.to_tokens(tokens);
}
return default.to_tokens(tokens);
}
}
}
}
}
}
}
}
TokensOrDefault(&self.eq_token).to_tokens(tokens);
default.to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TraitBound {
fn to_tokens(&self, tokens: &mut TokenStream) {
let to_tokens = |tokens: &mut TokenStream| {
#[cfg(feature = "full")]
let skip = match self.path.segments.pairs().next() {
Some(Pair::Punctuated(t, p)) if t.ident == "const" => {
Token.to_tokens(tokens);
t.to_tokens(tokens);
1
}
_ => 0,
};
self.modifier.to_tokens(tokens);
self.lifetimes.to_tokens(tokens);
#[cfg(feature = "full")]
{
self.path.leading_colon.to_tokens(tokens);
tokens.append_all(self.path.segments.pairs().skip(skip));
}
#[cfg(not(feature = "full"))]
{
self.path.to_tokens(tokens);
}
};
match &self.paren_token {
Some(paren) => paren.surround(tokens, to_tokens),
None => to_tokens(tokens),
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TraitBoundModifier {
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
TraitBoundModifier::None => {}
TraitBoundModifier::Maybe(t) => t.to_tokens(tokens),
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ConstParam {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.const_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.colon_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
if let Some(default) = &self.default {
TokensOrDefault(&self.eq_token).to_tokens(tokens);
default.to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for WhereClause {
fn to_tokens(&self, tokens: &mut TokenStream) {
if !self.predicates.is_empty() {
self.where_token.to_tokens(tokens);
self.predicates.to_tokens(tokens);
}
}src/item.rs (line 1625)
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fn parse_fn_args(input: ParseStream) -> Result<Punctuated<FnArg, Token![,]>> {
let mut args = Punctuated::new();
let mut has_receiver = false;
while !input.is_empty() {
let attrs = input.call(Attribute::parse_outer)?;
let arg = if let Some(dots) = input.parse::<Option<Token![...]>>()? {
FnArg::Typed(PatType {
attrs,
pat: Box::new(Pat::Verbatim(variadic_to_tokens(&dots))),
colon_token: Token,
ty: Box::new(Type::Verbatim(variadic_to_tokens(&dots))),
})
} else {
let mut arg: FnArg = input.parse()?;
match &mut arg {
FnArg::Receiver(receiver) if has_receiver => {
return Err(Error::new(
receiver.self_token.span,
"unexpected second method receiver",
));
}
FnArg::Receiver(receiver) if !args.is_empty() => {
return Err(Error::new(
receiver.self_token.span,
"unexpected method receiver",
));
}
FnArg::Receiver(receiver) => {
has_receiver = true;
receiver.attrs = attrs;
}
FnArg::Typed(arg) => arg.attrs = attrs,
}
arg
};
args.push_value(arg);
if input.is_empty() {
break;
}
let comma: Token![,] = input.parse()?;
args.push_punct(comma);
}
Ok(args)
}
fn fn_arg_typed(input: ParseStream) -> Result<PatType> {
// Hack to parse pre-2018 syntax in
// test/ui/rfc-2565-param-attrs/param-attrs-pretty.rs
// because the rest of the test case is valuable.
if input.peek(Ident) && input.peek2(Token![<]) {
let span = input.fork().parse::<Ident>()?.span();
return Ok(PatType {
attrs: Vec::new(),
pat: Box::new(Pat::Wild(PatWild {
attrs: Vec::new(),
underscore_token: Token,
})),
colon_token: Token,
ty: input.parse()?,
});
}
Ok(PatType {
attrs: Vec::new(),
pat: Box::new(pat::parsing::multi_pat(input)?),
colon_token: input.parse()?,
ty: Box::new(match input.parse::<Option<Token![...]>>()? {
Some(dot3) => Type::Verbatim(variadic_to_tokens(&dot3)),
None => input.parse()?,
}),
})
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemMod {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let mod_token: Token![mod] = input.parse()?;
let ident: Ident = input.parse()?;
let lookahead = input.lookahead1();
if lookahead.peek(Token![;]) {
Ok(ItemMod {
attrs,
vis,
mod_token,
ident,
content: None,
semi: Some(input.parse()?),
})
} else if lookahead.peek(token::Brace) {
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
Ok(ItemMod {
attrs,
vis,
mod_token,
ident,
content: Some((brace_token, items)),
semi: None,
})
} else {
Err(lookahead.error())
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemForeignMod {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let abi: Abi = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
Ok(ItemForeignMod {
attrs,
abi,
brace_token,
items,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ForeignItem {
fn parse(input: ParseStream) -> Result<Self> {
let begin = input.fork();
let mut attrs = input.call(Attribute::parse_outer)?;
let ahead = input.fork();
let vis: Visibility = ahead.parse()?;
let lookahead = ahead.lookahead1();
let mut item = if lookahead.peek(Token![fn]) || peek_signature(&ahead) {
let vis: Visibility = input.parse()?;
let sig: Signature = input.parse()?;
if input.peek(token::Brace) {
let content;
braced!(content in input);
content.call(Attribute::parse_inner)?;
content.call(Block::parse_within)?;
Ok(ForeignItem::Verbatim(verbatim::between(begin, input)))
} else {
Ok(ForeignItem::Fn(ForeignItemFn {
attrs: Vec::new(),
vis,
sig,
semi_token: input.parse()?,
}))
}
} else if lookahead.peek(Token![static]) {
let vis = input.parse()?;
let static_token = input.parse()?;
let mutability = input.parse()?;
let ident = input.parse()?;
let colon_token = input.parse()?;
let ty = input.parse()?;
if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
input.parse::<Expr>()?;
input.parse::<Token![;]>()?;
Ok(ForeignItem::Verbatim(verbatim::between(begin, input)))
} else {
Ok(ForeignItem::Static(ForeignItemStatic {
attrs: Vec::new(),
vis,
static_token,
mutability,
ident,
colon_token,
ty,
semi_token: input.parse()?,
}))
}
} else if lookahead.peek(Token![type]) {
parse_foreign_item_type(begin, input)
} else if vis.is_inherited()
&& (lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| lookahead.peek(Token![crate])
|| lookahead.peek(Token![::]))
{
input.parse().map(ForeignItem::Macro)
} else {
Err(lookahead.error())
}?;
let item_attrs = match &mut item {
ForeignItem::Fn(item) => &mut item.attrs,
ForeignItem::Static(item) => &mut item.attrs,
ForeignItem::Type(item) => &mut item.attrs,
ForeignItem::Macro(item) => &mut item.attrs,
ForeignItem::Verbatim(_) => return Ok(item),
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
};
attrs.append(item_attrs);
*item_attrs = attrs;
Ok(item)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ForeignItemFn {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let sig: Signature = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(ForeignItemFn {
attrs,
vis,
sig,
semi_token,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ForeignItemStatic {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ForeignItemStatic {
attrs: input.call(Attribute::parse_outer)?,
vis: input.parse()?,
static_token: input.parse()?,
mutability: input.parse()?,
ident: input.parse()?,
colon_token: input.parse()?,
ty: input.parse()?,
semi_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ForeignItemType {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ForeignItemType {
attrs: input.call(Attribute::parse_outer)?,
vis: input.parse()?,
type_token: input.parse()?,
ident: input.parse()?,
semi_token: input.parse()?,
})
}
}
fn parse_foreign_item_type(begin: ParseBuffer, input: ParseStream) -> Result<ForeignItem> {
let FlexibleItemType {
vis,
defaultness,
type_token,
ident,
generics,
colon_token,
bounds: _,
ty,
semi_token,
} = FlexibleItemType::parse(input, WhereClauseLocation::BeforeEq)?;
if defaultness.is_some()
|| generics.lt_token.is_some()
|| generics.where_clause.is_some()
|| colon_token.is_some()
|| ty.is_some()
{
Ok(ForeignItem::Verbatim(verbatim::between(begin, input)))
} else {
Ok(ForeignItem::Type(ForeignItemType {
attrs: Vec::new(),
vis,
type_token,
ident,
semi_token,
}))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ForeignItemMacro {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let mac: Macro = input.parse()?;
let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {
None
} else {
Some(input.parse()?)
};
Ok(ForeignItemMacro {
attrs,
mac,
semi_token,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemType {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ItemType {
attrs: input.call(Attribute::parse_outer)?,
vis: input.parse()?,
type_token: input.parse()?,
ident: input.parse()?,
generics: {
let mut generics: Generics = input.parse()?;
generics.where_clause = input.parse()?;
generics
},
eq_token: input.parse()?,
ty: input.parse()?,
semi_token: input.parse()?,
})
}
}
fn parse_item_type(begin: ParseBuffer, input: ParseStream) -> Result<Item> {
let FlexibleItemType {
vis,
defaultness,
type_token,
ident,
generics,
colon_token,
bounds: _,
ty,
semi_token,
} = FlexibleItemType::parse(input, WhereClauseLocation::BeforeEq)?;
if defaultness.is_some() || colon_token.is_some() || ty.is_none() {
Ok(Item::Verbatim(verbatim::between(begin, input)))
} else {
let (eq_token, ty) = ty.unwrap();
Ok(Item::Type(ItemType {
attrs: Vec::new(),
vis,
type_token,
ident,
generics,
eq_token,
ty: Box::new(ty),
semi_token,
}))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemStruct {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis = input.parse::<Visibility>()?;
let struct_token = input.parse::<Token![struct]>()?;
let ident = input.parse::<Ident>()?;
let generics = input.parse::<Generics>()?;
let (where_clause, fields, semi_token) = derive::parsing::data_struct(input)?;
Ok(ItemStruct {
attrs,
vis,
struct_token,
ident,
generics: Generics {
where_clause,
..generics
},
fields,
semi_token,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemEnum {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis = input.parse::<Visibility>()?;
let enum_token = input.parse::<Token![enum]>()?;
let ident = input.parse::<Ident>()?;
let generics = input.parse::<Generics>()?;
let (where_clause, brace_token, variants) = derive::parsing::data_enum(input)?;
Ok(ItemEnum {
attrs,
vis,
enum_token,
ident,
generics: Generics {
where_clause,
..generics
},
brace_token,
variants,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemUnion {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis = input.parse::<Visibility>()?;
let union_token = input.parse::<Token![union]>()?;
let ident = input.parse::<Ident>()?;
let generics = input.parse::<Generics>()?;
let (where_clause, fields) = derive::parsing::data_union(input)?;
Ok(ItemUnion {
attrs,
vis,
union_token,
ident,
generics: Generics {
where_clause,
..generics
},
fields,
})
}
}
fn parse_trait_or_trait_alias(input: ParseStream) -> Result<Item> {
let (attrs, vis, trait_token, ident, generics) = parse_start_of_trait_alias(input)?;
let lookahead = input.lookahead1();
if lookahead.peek(token::Brace)
|| lookahead.peek(Token![:])
|| lookahead.peek(Token![where])
{
let unsafety = None;
let auto_token = None;
parse_rest_of_trait(
input,
attrs,
vis,
unsafety,
auto_token,
trait_token,
ident,
generics,
)
.map(Item::Trait)
} else if lookahead.peek(Token![=]) {
parse_rest_of_trait_alias(input, attrs, vis, trait_token, ident, generics)
.map(Item::TraitAlias)
} else {
Err(lookahead.error())
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemTrait {
fn parse(input: ParseStream) -> Result<Self> {
let outer_attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let unsafety: Option<Token![unsafe]> = input.parse()?;
let auto_token: Option<Token![auto]> = input.parse()?;
let trait_token: Token![trait] = input.parse()?;
let ident: Ident = input.parse()?;
let generics: Generics = input.parse()?;
parse_rest_of_trait(
input,
outer_attrs,
vis,
unsafety,
auto_token,
trait_token,
ident,
generics,
)
}
}
fn parse_rest_of_trait(
input: ParseStream,
mut attrs: Vec<Attribute>,
vis: Visibility,
unsafety: Option<Token![unsafe]>,
auto_token: Option<Token![auto]>,
trait_token: Token![trait],
ident: Ident,
mut generics: Generics,
) -> Result<ItemTrait> {
let colon_token: Option<Token![:]> = input.parse()?;
let mut supertraits = Punctuated::new();
if colon_token.is_some() {
loop {
if input.peek(Token![where]) || input.peek(token::Brace) {
break;
}
supertraits.push_value(input.parse()?);
if input.peek(Token![where]) || input.peek(token::Brace) {
break;
}
supertraits.push_punct(input.parse()?);
}
}
generics.where_clause = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
Ok(ItemTrait {
attrs,
vis,
unsafety,
auto_token,
trait_token,
ident,
generics,
colon_token,
supertraits,
brace_token,
items,
})
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemTraitAlias {
fn parse(input: ParseStream) -> Result<Self> {
let (attrs, vis, trait_token, ident, generics) = parse_start_of_trait_alias(input)?;
parse_rest_of_trait_alias(input, attrs, vis, trait_token, ident, generics)
}
}
fn parse_start_of_trait_alias(
input: ParseStream,
) -> Result<(Vec<Attribute>, Visibility, Token![trait], Ident, Generics)> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let trait_token: Token![trait] = input.parse()?;
let ident: Ident = input.parse()?;
let generics: Generics = input.parse()?;
Ok((attrs, vis, trait_token, ident, generics))
}
fn parse_rest_of_trait_alias(
input: ParseStream,
attrs: Vec<Attribute>,
vis: Visibility,
trait_token: Token![trait],
ident: Ident,
mut generics: Generics,
) -> Result<ItemTraitAlias> {
let eq_token: Token![=] = input.parse()?;
let mut bounds = Punctuated::new();
loop {
if input.peek(Token![where]) || input.peek(Token![;]) {
break;
}
bounds.push_value(input.parse()?);
if input.peek(Token![where]) || input.peek(Token![;]) {
break;
}
bounds.push_punct(input.parse()?);
}
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(ItemTraitAlias {
attrs,
vis,
trait_token,
ident,
generics,
eq_token,
bounds,
semi_token,
})
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitItem {
fn parse(input: ParseStream) -> Result<Self> {
let begin = input.fork();
let mut attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = input.parse()?;
let ahead = input.fork();
let lookahead = ahead.lookahead1();
let mut item = if lookahead.peek(Token![fn]) || peek_signature(&ahead) {
input.parse().map(TraitItem::Method)
} else if lookahead.peek(Token![const]) {
ahead.parse::<Token![const]>()?;
let lookahead = ahead.lookahead1();
if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.parse().map(TraitItem::Const)
} else if lookahead.peek(Token![async])
|| lookahead.peek(Token![unsafe])
|| lookahead.peek(Token![extern])
|| lookahead.peek(Token![fn])
{
input.parse().map(TraitItem::Method)
} else {
Err(lookahead.error())
}
} else if lookahead.peek(Token![type]) {
parse_trait_item_type(begin.fork(), input)
} else if lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| lookahead.peek(Token![crate])
|| lookahead.peek(Token![::])
{
input.parse().map(TraitItem::Macro)
} else {
Err(lookahead.error())
}?;
match (vis, defaultness) {
(Visibility::Inherited, None) => {}
_ => return Ok(TraitItem::Verbatim(verbatim::between(begin, input))),
}
let item_attrs = match &mut item {
TraitItem::Const(item) => &mut item.attrs,
TraitItem::Method(item) => &mut item.attrs,
TraitItem::Type(item) => &mut item.attrs,
TraitItem::Macro(item) => &mut item.attrs,
TraitItem::Verbatim(_) => unreachable!(),
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
};
attrs.append(item_attrs);
*item_attrs = attrs;
Ok(item)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitItemConst {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TraitItemConst {
attrs: input.call(Attribute::parse_outer)?,
const_token: input.parse()?,
ident: {
let lookahead = input.lookahead1();
if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.call(Ident::parse_any)?
} else {
return Err(lookahead.error());
}
},
colon_token: input.parse()?,
ty: input.parse()?,
default: {
if input.peek(Token![=]) {
let eq_token: Token![=] = input.parse()?;
let default: Expr = input.parse()?;
Some((eq_token, default))
} else {
None
}
},
semi_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitItemMethod {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let sig: Signature = input.parse()?;
let lookahead = input.lookahead1();
let (brace_token, stmts, semi_token) = if lookahead.peek(token::Brace) {
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
(Some(brace_token), stmts, None)
} else if lookahead.peek(Token![;]) {
let semi_token: Token![;] = input.parse()?;
(None, Vec::new(), Some(semi_token))
} else {
return Err(lookahead.error());
};
Ok(TraitItemMethod {
attrs,
sig,
default: brace_token.map(|brace_token| Block { brace_token, stmts }),
semi_token,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitItemType {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let type_token: Token![type] = input.parse()?;
let ident: Ident = input.parse()?;
let mut generics: Generics = input.parse()?;
let colon_token: Option<Token![:]> = input.parse()?;
let mut bounds = Punctuated::new();
if colon_token.is_some() {
while !input.peek(Token![where]) && !input.peek(Token![=]) && !input.peek(Token![;])
{
if !bounds.is_empty() {
bounds.push_punct(input.parse()?);
}
bounds.push_value(input.parse()?);
}
}
let default = if input.peek(Token![=]) {
let eq_token: Token![=] = input.parse()?;
let default: Type = input.parse()?;
Some((eq_token, default))
} else {
None
};
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(TraitItemType {
attrs,
type_token,
ident,
generics,
colon_token,
bounds,
default,
semi_token,
})
}
}
fn parse_trait_item_type(begin: ParseBuffer, input: ParseStream) -> Result<TraitItem> {
let FlexibleItemType {
vis,
defaultness,
type_token,
ident,
generics,
colon_token,
bounds,
ty,
semi_token,
} = FlexibleItemType::parse(input, WhereClauseLocation::Both)?;
if defaultness.is_some() || vis.is_some() {
Ok(TraitItem::Verbatim(verbatim::between(begin, input)))
} else {
Ok(TraitItem::Type(TraitItemType {
attrs: Vec::new(),
type_token,
ident,
generics,
colon_token,
bounds,
default: ty,
semi_token,
}))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitItemMacro {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let mac: Macro = input.parse()?;
let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {
None
} else {
Some(input.parse()?)
};
Ok(TraitItemMacro {
attrs,
mac,
semi_token,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ItemImpl {
fn parse(input: ParseStream) -> Result<Self> {
let allow_verbatim_impl = false;
parse_impl(input, allow_verbatim_impl).map(Option::unwrap)
}
}
fn parse_impl(input: ParseStream, allow_verbatim_impl: bool) -> Result<Option<ItemImpl>> {
let mut attrs = input.call(Attribute::parse_outer)?;
let has_visibility = allow_verbatim_impl && input.parse::<Visibility>()?.is_some();
let defaultness: Option<Token![default]> = input.parse()?;
let unsafety: Option<Token![unsafe]> = input.parse()?;
let impl_token: Token![impl] = input.parse()?;
let has_generics = input.peek(Token![<])
&& (input.peek2(Token![>])
|| input.peek2(Token![#])
|| (input.peek2(Ident) || input.peek2(Lifetime))
&& (input.peek3(Token![:])
|| input.peek3(Token![,])
|| input.peek3(Token![>])
|| input.peek3(Token![=]))
|| input.peek2(Token![const]));
let mut generics: Generics = if has_generics {
input.parse()?
} else {
Generics::default()
};
let is_const_impl = allow_verbatim_impl
&& (input.peek(Token![const]) || input.peek(Token![?]) && input.peek2(Token![const]));
if is_const_impl {
input.parse::<Option<Token![?]>>()?;
input.parse::<Token![const]>()?;
}
let begin = input.fork();
let polarity = if input.peek(Token![!]) && !input.peek2(token::Brace) {
Some(input.parse::<Token![!]>()?)
} else {
None
};
#[cfg(not(feature = "printing"))]
let first_ty_span = input.span();
let mut first_ty: Type = input.parse()?;
let self_ty: Type;
let trait_;
let is_impl_for = input.peek(Token![for]);
if is_impl_for {
let for_token: Token![for] = input.parse()?;
let mut first_ty_ref = &first_ty;
while let Type::Group(ty) = first_ty_ref {
first_ty_ref = &ty.elem;
}
if let Type::Path(TypePath { qself: None, .. }) = first_ty_ref {
while let Type::Group(ty) = first_ty {
first_ty = *ty.elem;
}
if let Type::Path(TypePath { qself: None, path }) = first_ty {
trait_ = Some((polarity, path, for_token));
} else {
unreachable!();
}
} else if !allow_verbatim_impl {
#[cfg(feature = "printing")]
return Err(Error::new_spanned(first_ty_ref, "expected trait path"));
#[cfg(not(feature = "printing"))]
return Err(Error::new(first_ty_span, "expected trait path"));
} else {
trait_ = None;
}
self_ty = input.parse()?;
} else {
trait_ = None;
self_ty = if polarity.is_none() {
first_ty
} else {
Type::Verbatim(verbatim::between(begin, input))
};
}
generics.where_clause = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
if has_visibility || is_const_impl || is_impl_for && trait_.is_none() {
Ok(None)
} else {
Ok(Some(ItemImpl {
attrs,
defaultness,
unsafety,
impl_token,
generics,
trait_,
self_ty: Box::new(self_ty),
brace_token,
items,
}))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ImplItem {
fn parse(input: ParseStream) -> Result<Self> {
let begin = input.fork();
let mut attrs = input.call(Attribute::parse_outer)?;
let ahead = input.fork();
let vis: Visibility = ahead.parse()?;
let mut lookahead = ahead.lookahead1();
let defaultness = if lookahead.peek(Token![default]) && !ahead.peek2(Token![!]) {
let defaultness: Token![default] = ahead.parse()?;
lookahead = ahead.lookahead1();
Some(defaultness)
} else {
None
};
let mut item = if lookahead.peek(Token![fn]) || peek_signature(&ahead) {
input.parse().map(ImplItem::Method)
} else if lookahead.peek(Token![const]) {
let const_token: Token![const] = ahead.parse()?;
let lookahead = ahead.lookahead1();
if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.advance_to(&ahead);
let ident: Ident = input.call(Ident::parse_any)?;
let colon_token: Token![:] = input.parse()?;
let ty: Type = input.parse()?;
if let Some(eq_token) = input.parse()? {
return Ok(ImplItem::Const(ImplItemConst {
attrs,
vis,
defaultness,
const_token,
ident,
colon_token,
ty,
eq_token,
expr: input.parse()?,
semi_token: input.parse()?,
}));
} else {
input.parse::<Token![;]>()?;
return Ok(ImplItem::Verbatim(verbatim::between(begin, input)));
}
} else {
Err(lookahead.error())
}
} else if lookahead.peek(Token![type]) {
parse_impl_item_type(begin, input)
} else if vis.is_inherited()
&& defaultness.is_none()
&& (lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| lookahead.peek(Token![crate])
|| lookahead.peek(Token![::]))
{
input.parse().map(ImplItem::Macro)
} else {
Err(lookahead.error())
}?;
{
let item_attrs = match &mut item {
ImplItem::Const(item) => &mut item.attrs,
ImplItem::Method(item) => &mut item.attrs,
ImplItem::Type(item) => &mut item.attrs,
ImplItem::Macro(item) => &mut item.attrs,
ImplItem::Verbatim(_) => return Ok(item),
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
};
attrs.append(item_attrs);
*item_attrs = attrs;
}
Ok(item)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ImplItemConst {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ImplItemConst {
attrs: input.call(Attribute::parse_outer)?,
vis: input.parse()?,
defaultness: input.parse()?,
const_token: input.parse()?,
ident: {
let lookahead = input.lookahead1();
if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.call(Ident::parse_any)?
} else {
return Err(lookahead.error());
}
},
colon_token: input.parse()?,
ty: input.parse()?,
eq_token: input.parse()?,
expr: input.parse()?,
semi_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ImplItemMethod {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = input.parse()?;
let sig: Signature = input.parse()?;
let block = if let Some(semi) = input.parse::<Option<Token![;]>>()? {
// Accept methods without a body in an impl block because
// rustc's *parser* does not reject them (the compilation error
// is emitted later than parsing) and it can be useful for macro
// DSLs.
let mut punct = Punct::new(';', Spacing::Alone);
punct.set_span(semi.span);
let tokens = TokenStream::from_iter(vec![TokenTree::Punct(punct)]);
Block {
brace_token: Brace { span: semi.span },
stmts: vec![Stmt::Item(Item::Verbatim(tokens))],
}
} else {
let content;
let brace_token = braced!(content in input);
attrs.extend(content.call(Attribute::parse_inner)?);
Block {
brace_token,
stmts: content.call(Block::parse_within)?,
}
};
Ok(ImplItemMethod {
attrs,
vis,
defaultness,
sig,
block,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ImplItemType {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = input.parse()?;
let type_token: Token![type] = input.parse()?;
let ident: Ident = input.parse()?;
let mut generics: Generics = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let ty: Type = input.parse()?;
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(ImplItemType {
attrs,
vis,
defaultness,
type_token,
ident,
generics,
eq_token,
ty,
semi_token,
})
}
}
fn parse_impl_item_type(begin: ParseBuffer, input: ParseStream) -> Result<ImplItem> {
let FlexibleItemType {
vis,
defaultness,
type_token,
ident,
generics,
colon_token,
bounds: _,
ty,
semi_token,
} = FlexibleItemType::parse(input, WhereClauseLocation::Both)?;
if colon_token.is_some() || ty.is_none() {
Ok(ImplItem::Verbatim(verbatim::between(begin, input)))
} else {
let (eq_token, ty) = ty.unwrap();
Ok(ImplItem::Type(ImplItemType {
attrs: Vec::new(),
vis,
defaultness,
type_token,
ident,
generics,
eq_token,
ty,
semi_token,
}))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ImplItemMacro {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let mac: Macro = input.parse()?;
let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {
None
} else {
Some(input.parse()?)
};
Ok(ImplItemMacro {
attrs,
mac,
semi_token,
})
}
}
impl Visibility {
fn is_inherited(&self) -> bool {
match *self {
Visibility::Inherited => true,
_ => false,
}
}
}
impl MacroDelimiter {
fn is_brace(&self) -> bool {
match *self {
MacroDelimiter::Brace(_) => true,
MacroDelimiter::Paren(_) | MacroDelimiter::Bracket(_) => false,
}
}
}
}
#[cfg(feature = "printing")]
mod printing {
use super::*;
use crate::attr::FilterAttrs;
use crate::print::TokensOrDefault;
use proc_macro2::TokenStream;
use quote::{ToTokens, TokenStreamExt};
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemExternCrate {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.extern_token.to_tokens(tokens);
self.crate_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
if let Some((as_token, rename)) = &self.rename {
as_token.to_tokens(tokens);
rename.to_tokens(tokens);
}
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemUse {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.use_token.to_tokens(tokens);
self.leading_colon.to_tokens(tokens);
self.tree.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemStatic {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.static_token.to_tokens(tokens);
self.mutability.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.colon_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
self.eq_token.to_tokens(tokens);
self.expr.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemConst {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.const_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.colon_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
self.eq_token.to_tokens(tokens);
self.expr.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemFn {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.sig.to_tokens(tokens);
self.block.brace_token.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(&self.block.stmts);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemMod {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.mod_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
if let Some((brace, items)) = &self.content {
brace.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(items);
});
} else {
TokensOrDefault(&self.semi).to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemForeignMod {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.abi.to_tokens(tokens);
self.brace_token.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(&self.items);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemType {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.type_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
self.eq_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemEnum {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.enum_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
self.brace_token.surround(tokens, |tokens| {
self.variants.to_tokens(tokens);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemStruct {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.struct_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
match &self.fields {
Fields::Named(fields) => {
self.generics.where_clause.to_tokens(tokens);
fields.to_tokens(tokens);
}
Fields::Unnamed(fields) => {
fields.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
TokensOrDefault(&self.semi_token).to_tokens(tokens);
}
Fields::Unit => {
self.generics.where_clause.to_tokens(tokens);
TokensOrDefault(&self.semi_token).to_tokens(tokens);
}
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemUnion {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.union_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
self.fields.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemTrait {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.unsafety.to_tokens(tokens);
self.auto_token.to_tokens(tokens);
self.trait_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
if !self.supertraits.is_empty() {
TokensOrDefault(&self.colon_token).to_tokens(tokens);
self.supertraits.to_tokens(tokens);
}
self.generics.where_clause.to_tokens(tokens);
self.brace_token.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(&self.items);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemTraitAlias {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.trait_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
self.eq_token.to_tokens(tokens);
self.bounds.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemImpl {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.defaultness.to_tokens(tokens);
self.unsafety.to_tokens(tokens);
self.impl_token.to_tokens(tokens);
self.generics.to_tokens(tokens);
if let Some((polarity, path, for_token)) = &self.trait_ {
polarity.to_tokens(tokens);
path.to_tokens(tokens);
for_token.to_tokens(tokens);
}
self.self_ty.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
self.brace_token.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(&self.items);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemMacro {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.mac.path.to_tokens(tokens);
self.mac.bang_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
match &self.mac.delimiter {
MacroDelimiter::Paren(paren) => {
paren.surround(tokens, |tokens| self.mac.tokens.to_tokens(tokens));
}
MacroDelimiter::Brace(brace) => {
brace.surround(tokens, |tokens| self.mac.tokens.to_tokens(tokens));
}
MacroDelimiter::Bracket(bracket) => {
bracket.surround(tokens, |tokens| self.mac.tokens.to_tokens(tokens));
}
}
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ItemMacro2 {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.macro_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.rules.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for UsePath {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
self.colon2_token.to_tokens(tokens);
self.tree.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for UseName {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for UseRename {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
self.as_token.to_tokens(tokens);
self.rename.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for UseGlob {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.star_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for UseGroup {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.brace_token.surround(tokens, |tokens| {
self.items.to_tokens(tokens);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TraitItemConst {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.const_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.colon_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
if let Some((eq_token, default)) = &self.default {
eq_token.to_tokens(tokens);
default.to_tokens(tokens);
}
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TraitItemMethod {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.sig.to_tokens(tokens);
match &self.default {
Some(block) => {
block.brace_token.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(&block.stmts);
});
}
None => {
TokensOrDefault(&self.semi_token).to_tokens(tokens);
}
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TraitItemType {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.type_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
if !self.bounds.is_empty() {
TokensOrDefault(&self.colon_token).to_tokens(tokens);
self.bounds.to_tokens(tokens);
}
if let Some((eq_token, default)) = &self.default {
eq_token.to_tokens(tokens);
default.to_tokens(tokens);
}
self.generics.where_clause.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}sourcepub fn len(&self) -> usize
pub fn len(&self) -> usize
Returns the number of syntax tree nodes in this punctuated sequence.
This is the number of nodes of type T, not counting the punctuation of
type P.
Examples found in repository?
More examples
src/punctuated.rs (line 241)
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pub fn insert(&mut self, index: usize, value: T)
where
P: Default,
{
assert!(
index <= self.len(),
"Punctuated::insert: index out of range",
);
if index == self.len() {
self.push(value);
} else {
self.inner.insert(index, (value, Default::default()));
}
}
/// Clears the sequence of all values and punctuation, making it empty.
pub fn clear(&mut self) {
self.inner.clear();
self.last = None;
}
/// Parses zero or more occurrences of `T` separated by punctuation of type
/// `P`, with optional trailing punctuation.
///
/// Parsing continues until the end of this parse stream. The entire content
/// of this parse stream must consist of `T` and `P`.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Parse,
{
Self::parse_terminated_with(input, T::parse)
}
/// Parses zero or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, with optional trailing
/// punctuation.
///
/// Like [`parse_terminated`], the entire content of this stream is expected
/// to be parsed.
///
/// [`parse_terminated`]: Punctuated::parse_terminated
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
}
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<T, P> Clone for Punctuated<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
Punctuated {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Eq for Punctuated<T, P>
where
T: Eq,
P: Eq,
{
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> PartialEq for Punctuated<T, P>
where
T: PartialEq,
P: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
let Punctuated { inner, last } = self;
*inner == other.inner && *last == other.last
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Hash for Punctuated<T, P>
where
T: Hash,
P: Hash,
{
fn hash<H: Hasher>(&self, state: &mut H) {
let Punctuated { inner, last } = self;
inner.hash(state);
last.hash(state);
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut list = f.debug_list();
for (t, p) in &self.inner {
list.entry(t);
list.entry(p);
}
if let Some(last) = &self.last {
list.entry(last);
}
list.finish()
}
}
impl<T, P> FromIterator<T> for Punctuated<T, P>
where
P: Default,
{
fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<T> for Punctuated<T, P>
where
P: Default,
{
fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
for value in i {
self.push(value);
}
}
}
impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P> {
fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P> {
fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {
assert!(
self.empty_or_trailing(),
"Punctuated::extend: Punctuated is not empty or does not have a trailing punctuation",
);
let mut nomore = false;
for pair in i {
if nomore {
panic!("Punctuated extended with items after a Pair::End");
}
match pair {
Pair::Punctuated(a, b) => self.inner.push((a, b)),
Pair::End(a) => {
self.last = Some(Box::new(a));
nomore = true;
}
}
}
}
}
impl<T, P> IntoIterator for Punctuated<T, P> {
type Item = T;
type IntoIter = IntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
let mut elements = Vec::with_capacity(self.len());
elements.extend(self.inner.into_iter().map(|pair| pair.0));
elements.extend(self.last.map(|t| *t));
IntoIter {
inner: elements.into_iter(),
}
}
}
impl<'a, T, P> IntoIterator for &'a Punctuated<T, P> {
type Item = &'a T;
type IntoIter = Iter<'a, T>;
fn into_iter(self) -> Self::IntoIter {
Punctuated::iter(self)
}
}
impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P> {
type Item = &'a mut T;
type IntoIter = IterMut<'a, T>;
fn into_iter(self) -> Self::IntoIter {
Punctuated::iter_mut(self)
}
}
impl<T, P> Default for Punctuated<T, P> {
fn default() -> Self {
Punctuated::new()
}
}
/// An iterator over borrowed pairs of type `Pair<&T, &P>`.
///
/// Refer to the [module documentation] for details about punctuated sequences.
///
/// [module documentation]: self
pub struct Pairs<'a, T: 'a, P: 'a> {
inner: slice::Iter<'a, (T, P)>,
last: option::IntoIter<&'a T>,
}
impl<'a, T, P> Iterator for Pairs<'a, T, P> {
type Item = Pair<&'a T, &'a P>;
fn next(&mut self) -> Option<Self::Item> {
self.inner
.next()
.map(|(t, p)| Pair::Punctuated(t, p))
.or_else(|| self.last.next().map(Pair::End))
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len(), Some(self.len()))
}
}
impl<'a, T, P> DoubleEndedIterator for Pairs<'a, T, P> {
fn next_back(&mut self) -> Option<Self::Item> {
self.last
.next()
.map(Pair::End)
.or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
}
}
impl<'a, T, P> ExactSizeIterator for Pairs<'a, T, P> {
fn len(&self) -> usize {
self.inner.len() + self.last.len()
}
}
// No Clone bound on T or P.
impl<'a, T, P> Clone for Pairs<'a, T, P> {
fn clone(&self) -> Self {
Pairs {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
/// An iterator over mutably borrowed pairs of type `Pair<&mut T, &mut P>`.
///
/// Refer to the [module documentation] for details about punctuated sequences.
///
/// [module documentation]: self
pub struct PairsMut<'a, T: 'a, P: 'a> {
inner: slice::IterMut<'a, (T, P)>,
last: option::IntoIter<&'a mut T>,
}
impl<'a, T, P> Iterator for PairsMut<'a, T, P> {
type Item = Pair<&'a mut T, &'a mut P>;
fn next(&mut self) -> Option<Self::Item> {
self.inner
.next()
.map(|(t, p)| Pair::Punctuated(t, p))
.or_else(|| self.last.next().map(Pair::End))
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len(), Some(self.len()))
}
}
impl<'a, T, P> DoubleEndedIterator for PairsMut<'a, T, P> {
fn next_back(&mut self) -> Option<Self::Item> {
self.last
.next()
.map(Pair::End)
.or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
}
}
impl<'a, T, P> ExactSizeIterator for PairsMut<'a, T, P> {
fn len(&self) -> usize {
self.inner.len() + self.last.len()
}
}
/// An iterator over owned pairs of type `Pair<T, P>`.
///
/// Refer to the [module documentation] for details about punctuated sequences.
///
/// [module documentation]: self
pub struct IntoPairs<T, P> {
inner: vec::IntoIter<(T, P)>,
last: option::IntoIter<T>,
}
impl<T, P> Iterator for IntoPairs<T, P> {
type Item = Pair<T, P>;
fn next(&mut self) -> Option<Self::Item> {
self.inner
.next()
.map(|(t, p)| Pair::Punctuated(t, p))
.or_else(|| self.last.next().map(Pair::End))
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len(), Some(self.len()))
}
}
impl<T, P> DoubleEndedIterator for IntoPairs<T, P> {
fn next_back(&mut self) -> Option<Self::Item> {
self.last
.next()
.map(Pair::End)
.or_else(|| self.inner.next_back().map(|(t, p)| Pair::Punctuated(t, p)))
}
}
impl<T, P> ExactSizeIterator for IntoPairs<T, P> {
fn len(&self) -> usize {
self.inner.len() + self.last.len()
}
}
impl<T, P> Clone for IntoPairs<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
IntoPairs {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
/// An iterator over owned values of type `T`.
///
/// Refer to the [module documentation] for details about punctuated sequences.
///
/// [module documentation]: self
pub struct IntoIter<T> {
inner: vec::IntoIter<T>,
}
impl<T> Iterator for IntoIter<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
self.inner.next()
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len(), Some(self.len()))
}
}
impl<T> DoubleEndedIterator for IntoIter<T> {
fn next_back(&mut self) -> Option<Self::Item> {
self.inner.next_back()
}
}
impl<T> ExactSizeIterator for IntoIter<T> {
fn len(&self) -> usize {
self.inner.len()
}
}
impl<T> Clone for IntoIter<T>
where
T: Clone,
{
fn clone(&self) -> Self {
IntoIter {
inner: self.inner.clone(),
}
}
}
/// An iterator over borrowed values of type `&T`.
///
/// Refer to the [module documentation] for details about punctuated sequences.
///
/// [module documentation]: self
pub struct Iter<'a, T: 'a> {
// The `Item = &'a T` needs to be specified to support rustc 1.31 and older.
// On modern compilers we would be able to write just IterTrait<'a, T> where
// Item can be inferred unambiguously from the supertrait.
inner: Box<NoDrop<dyn IterTrait<'a, T, Item = &'a T> + 'a>>,
}
trait IterTrait<'a, T: 'a>:
DoubleEndedIterator<Item = &'a T> + ExactSizeIterator<Item = &'a T>
{
fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T, Item = &'a T> + 'a>>;
}
struct PrivateIter<'a, T: 'a, P: 'a> {
inner: slice::Iter<'a, (T, P)>,
last: option::IntoIter<&'a T>,
}
impl<'a, T, P> TrivialDrop for PrivateIter<'a, T, P>
where
slice::Iter<'a, (T, P)>: TrivialDrop,
option::IntoIter<&'a T>: TrivialDrop,
{
}
#[cfg(any(feature = "full", feature = "derive"))]
pub(crate) fn empty_punctuated_iter<'a, T>() -> Iter<'a, T> {
Iter {
inner: Box::new(NoDrop::new(iter::empty())),
}
}
// No Clone bound on T.
impl<'a, T> Clone for Iter<'a, T> {
fn clone(&self) -> Self {
Iter {
inner: self.inner.clone_box(),
}
}
}
impl<'a, T> Iterator for Iter<'a, T> {
type Item = &'a T;
fn next(&mut self) -> Option<Self::Item> {
self.inner.next()
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len(), Some(self.len()))
}
}
impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
fn next_back(&mut self) -> Option<Self::Item> {
self.inner.next_back()
}
}
impl<'a, T> ExactSizeIterator for Iter<'a, T> {
fn len(&self) -> usize {
self.inner.len()
}
}
impl<'a, T, P> Iterator for PrivateIter<'a, T, P> {
type Item = &'a T;
fn next(&mut self) -> Option<Self::Item> {
self.inner
.next()
.map(|pair| &pair.0)
.or_else(|| self.last.next())
}
}
impl<'a, T, P> DoubleEndedIterator for PrivateIter<'a, T, P> {
fn next_back(&mut self) -> Option<Self::Item> {
self.last
.next()
.or_else(|| self.inner.next_back().map(|pair| &pair.0))
}
}
impl<'a, T, P> ExactSizeIterator for PrivateIter<'a, T, P> {
fn len(&self) -> usize {
self.inner.len() + self.last.len()
}
}
// No Clone bound on T or P.
impl<'a, T, P> Clone for PrivateIter<'a, T, P> {
fn clone(&self) -> Self {
PrivateIter {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
impl<'a, T, I> IterTrait<'a, T> for I
where
T: 'a,
I: DoubleEndedIterator<Item = &'a T>
+ ExactSizeIterator<Item = &'a T>
+ Clone
+ TrivialDrop
+ 'a,
{
fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T, Item = &'a T> + 'a>> {
Box::new(NoDrop::new(self.clone()))
}
}
/// An iterator over mutably borrowed values of type `&mut T`.
///
/// Refer to the [module documentation] for details about punctuated sequences.
///
/// [module documentation]: self
pub struct IterMut<'a, T: 'a> {
inner: Box<NoDrop<dyn IterMutTrait<'a, T, Item = &'a mut T> + 'a>>,
}
trait IterMutTrait<'a, T: 'a>:
DoubleEndedIterator<Item = &'a mut T> + ExactSizeIterator<Item = &'a mut T>
{
}
struct PrivateIterMut<'a, T: 'a, P: 'a> {
inner: slice::IterMut<'a, (T, P)>,
last: option::IntoIter<&'a mut T>,
}
impl<'a, T, P> TrivialDrop for PrivateIterMut<'a, T, P>
where
slice::IterMut<'a, (T, P)>: TrivialDrop,
option::IntoIter<&'a mut T>: TrivialDrop,
{
}
#[cfg(any(feature = "full", feature = "derive"))]
pub(crate) fn empty_punctuated_iter_mut<'a, T>() -> IterMut<'a, T> {
IterMut {
inner: Box::new(NoDrop::new(iter::empty())),
}
}
impl<'a, T> Iterator for IterMut<'a, T> {
type Item = &'a mut T;
fn next(&mut self) -> Option<Self::Item> {
self.inner.next()
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len(), Some(self.len()))
}
}
impl<'a, T> DoubleEndedIterator for IterMut<'a, T> {
fn next_back(&mut self) -> Option<Self::Item> {
self.inner.next_back()
}
}
impl<'a, T> ExactSizeIterator for IterMut<'a, T> {
fn len(&self) -> usize {
self.inner.len()
}
}
impl<'a, T, P> Iterator for PrivateIterMut<'a, T, P> {
type Item = &'a mut T;
fn next(&mut self) -> Option<Self::Item> {
self.inner
.next()
.map(|pair| &mut pair.0)
.or_else(|| self.last.next())
}
}
impl<'a, T, P> DoubleEndedIterator for PrivateIterMut<'a, T, P> {
fn next_back(&mut self) -> Option<Self::Item> {
self.last
.next()
.or_else(|| self.inner.next_back().map(|pair| &mut pair.0))
}
}
impl<'a, T, P> ExactSizeIterator for PrivateIterMut<'a, T, P> {
fn len(&self) -> usize {
self.inner.len() + self.last.len()
}
}
impl<'a, T, I> IterMutTrait<'a, T> for I
where
T: 'a,
I: DoubleEndedIterator<Item = &'a mut T> + ExactSizeIterator<Item = &'a mut T> + 'a,
{
}
/// A single syntax tree node of type `T` followed by its trailing punctuation
/// of type `P` if any.
///
/// Refer to the [module documentation] for details about punctuated sequences.
///
/// [module documentation]: self
pub enum Pair<T, P> {
Punctuated(T, P),
End(T),
}
impl<T, P> Pair<T, P> {
/// Extracts the syntax tree node from this punctuated pair, discarding the
/// following punctuation.
pub fn into_value(self) -> T {
match self {
Pair::Punctuated(t, _) | Pair::End(t) => t,
}
}
/// Borrows the syntax tree node from this punctuated pair.
pub fn value(&self) -> &T {
match self {
Pair::Punctuated(t, _) | Pair::End(t) => t,
}
}
/// Mutably borrows the syntax tree node from this punctuated pair.
pub fn value_mut(&mut self) -> &mut T {
match self {
Pair::Punctuated(t, _) | Pair::End(t) => t,
}
}
/// Borrows the punctuation from this punctuated pair, unless this pair is
/// the final one and there is no trailing punctuation.
pub fn punct(&self) -> Option<&P> {
match self {
Pair::Punctuated(_, p) => Some(p),
Pair::End(_) => None,
}
}
/// Mutably borrows the punctuation from this punctuated pair, unless the
/// pair is the final one and there is no trailing punctuation.
///
/// # Example
///
/// ```
/// # use proc_macro2::Span;
/// # use syn::punctuated::Punctuated;
/// # use syn::{parse_quote, Token, TypeParamBound};
/// #
/// # let mut punctuated = Punctuated::<TypeParamBound, Token![+]>::new();
/// # let span = Span::call_site();
/// #
/// punctuated.insert(0, parse_quote!('lifetime));
/// if let Some(punct) = punctuated.pairs_mut().next().unwrap().punct_mut() {
/// punct.span = span;
/// }
/// ```
pub fn punct_mut(&mut self) -> Option<&mut P> {
match self {
Pair::Punctuated(_, p) => Some(p),
Pair::End(_) => None,
}
}
/// Creates a punctuated pair out of a syntax tree node and an optional
/// following punctuation.
pub fn new(t: T, p: Option<P>) -> Self {
match p {
Some(p) => Pair::Punctuated(t, p),
None => Pair::End(t),
}
}
/// Produces this punctuated pair as a tuple of syntax tree node and
/// optional following punctuation.
pub fn into_tuple(self) -> (T, Option<P>) {
match self {
Pair::Punctuated(t, p) => (t, Some(p)),
Pair::End(t) => (t, None),
}
}
}
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<T, P> Clone for Pair<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
match self {
Pair::Punctuated(t, p) => Pair::Punctuated(t.clone(), p.clone()),
Pair::End(t) => Pair::End(t.clone()),
}
}
}
impl<T, P> Index<usize> for Punctuated<T, P> {
type Output = T;
fn index(&self, index: usize) -> &Self::Output {
if index == self.len() - 1 {
match &self.last {
Some(t) => t,
None => &self.inner[index].0,
}
} else {
&self.inner[index].0
}
}
}
impl<T, P> IndexMut<usize> for Punctuated<T, P> {
fn index_mut(&mut self, index: usize) -> &mut Self::Output {
if index == self.len() - 1 {
match &mut self.last {
Some(t) => t,
None => &mut self.inner[index].0,
}
} else {
&mut self.inner[index].0
}
}src/path.rs (line 289)
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fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) && !input.peek2(Token![+]) {
return Ok(GenericArgument::Lifetime(input.parse()?));
}
if input.peek(Ident) && input.peek2(Token![=]) {
let ident: Ident = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let ty = if input.peek(Lit) {
let begin = input.fork();
input.parse::<Lit>()?;
Type::Verbatim(verbatim::between(begin, input))
} else if input.peek(token::Brace) {
let begin = input.fork();
#[cfg(feature = "full")]
{
input.parse::<ExprBlock>()?;
}
#[cfg(not(feature = "full"))]
{
let content;
braced!(content in input);
content.parse::<Expr>()?;
}
Type::Verbatim(verbatim::between(begin, input))
} else {
input.parse()?
};
return Ok(GenericArgument::Binding(Binding {
ident,
eq_token,
ty,
}));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) && input.peek2(Token![:]) && !input.peek2(Token![::]) {
return Ok(GenericArgument::Constraint(input.parse()?));
}
}
if input.peek(Lit) || input.peek(token::Brace) {
return const_argument(input).map(GenericArgument::Const);
}
#[cfg(feature = "full")]
let begin = input.fork();
let argument: Type = input.parse()?;
#[cfg(feature = "full")]
{
if match &argument {
Type::Path(argument)
if argument.qself.is_none()
&& argument.path.leading_colon.is_none()
&& argument.path.segments.len() == 1 =>
{
match argument.path.segments[0].arguments {
PathArguments::AngleBracketed(_) => true,
_ => false,
}
}
_ => false,
} && if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
input.parse::<Type>()?;
true
} else if input.peek(Token![:]) {
input.parse::<Token![:]>()?;
input.call(constraint_bounds)?;
true
} else {
false
} {
let verbatim = verbatim::between(begin, input);
return Ok(GenericArgument::Type(Type::Verbatim(verbatim)));
}
}
Ok(GenericArgument::Type(argument))
}
}
pub fn const_argument(input: ParseStream) -> Result<Expr> {
let lookahead = input.lookahead1();
if input.peek(Lit) {
let lit = input.parse()?;
return Ok(Expr::Lit(lit));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) {
let ident: Ident = input.parse()?;
return Ok(Expr::Path(ExprPath {
attrs: Vec::new(),
qself: None,
path: Path::from(ident),
}));
}
}
if input.peek(token::Brace) {
#[cfg(feature = "full")]
{
let block: ExprBlock = input.parse()?;
return Ok(Expr::Block(block));
}
#[cfg(not(feature = "full"))]
{
let begin = input.fork();
let content;
braced!(content in input);
content.parse::<Expr>()?;
let verbatim = verbatim::between(begin, input);
return Ok(Expr::Verbatim(verbatim));
}
}
Err(lookahead.error())
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for AngleBracketedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
Ok(AngleBracketedGenericArguments {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ParenthesizedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ParenthesizedGenericArguments {
paren_token: parenthesized!(content in input),
inputs: content.parse_terminated(Type::parse)?,
output: input.call(ReturnType::without_plus)?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for PathSegment {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
impl PathSegment {
fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
if input.peek(Token![super]) || input.peek(Token![self]) || input.peek(Token![crate]) {
let ident = input.call(Ident::parse_any)?;
return Ok(PathSegment::from(ident));
}
let ident = if input.peek(Token![Self]) {
input.call(Ident::parse_any)?
} else {
input.parse()?
};
if !expr_style && input.peek(Token![<]) && !input.peek(Token![<=])
|| input.peek(Token![::]) && input.peek3(Token![<])
{
Ok(PathSegment {
ident,
arguments: PathArguments::AngleBracketed(input.parse()?),
})
} else {
Ok(PathSegment::from(ident))
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Binding {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Binding {
ident: input.parse()?,
eq_token: input.parse()?,
ty: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Constraint {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Constraint {
ident: input.parse()?,
colon_token: input.parse()?,
bounds: constraint_bounds(input)?,
})
}
}
#[cfg(feature = "full")]
fn constraint_bounds(input: ParseStream) -> Result<Punctuated<TypeParamBound, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
Ok(bounds)
}
impl Path {
/// Parse a `Path` containing no path arguments on any of its segments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Path, Result, Token};
/// use syn::parse::{Parse, ParseStream};
///
/// // A simplified single `use` statement like:
/// //
/// // use std::collections::HashMap;
/// //
/// // Note that generic parameters are not allowed in a `use` statement
/// // so the following must not be accepted.
/// //
/// // use a::<b>::c;
/// struct SingleUse {
/// use_token: Token![use],
/// path: Path,
/// }
///
/// impl Parse for SingleUse {
/// fn parse(input: ParseStream) -> Result<Self> {
/// Ok(SingleUse {
/// use_token: input.parse()?,
/// path: input.call(Path::parse_mod_style)?,
/// })
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_mod_style(input: ParseStream) -> Result<Self> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
loop {
if !input.peek(Ident)
&& !input.peek(Token![super])
&& !input.peek(Token![self])
&& !input.peek(Token![Self])
&& !input.peek(Token![crate])
{
break;
}
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}
/// Determines whether this is a path of length 1 equal to the given
/// ident.
///
/// For them to compare equal, it must be the case that:
///
/// - the path has no leading colon,
/// - the number of path segments is 1,
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments, and
/// - the ident of the first path segment is equal to the given one.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Attribute, Error, Meta, NestedMeta, Result};
/// # use std::iter::FromIterator;
///
/// fn get_serde_meta_items(attr: &Attribute) -> Result<Vec<NestedMeta>> {
/// if attr.path.is_ident("serde") {
/// match attr.parse_meta()? {
/// Meta::List(meta) => Ok(Vec::from_iter(meta.nested)),
/// bad => Err(Error::new_spanned(bad, "unrecognized attribute")),
/// }
/// } else {
/// Ok(Vec::new())
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn is_ident<I: ?Sized>(&self, ident: &I) -> bool
where
Ident: PartialEq<I>,
{
match self.get_ident() {
Some(id) => id == ident,
None => false,
}
}
/// If this path consists of a single ident, returns the ident.
///
/// A path is considered an ident if:
///
/// - the path has no leading colon,
/// - the number of path segments is 1, and
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn get_ident(&self) -> Option<&Ident> {
if self.leading_colon.is_none()
&& self.segments.len() == 1
&& self.segments[0].arguments.is_none()
{
Some(&self.segments[0].ident)
} else {
None
}
}
pub(crate) fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
let mut path = Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
let value = PathSegment::parse_helper(input, expr_style)?;
segments.push_value(value);
segments
},
};
Path::parse_rest(input, &mut path, expr_style)?;
Ok(path)
}
pub(crate) fn parse_rest(
input: ParseStream,
path: &mut Self,
expr_style: bool,
) -> Result<()> {
while input.peek(Token![::]) && !input.peek3(token::Paren) {
let punct: Token![::] = input.parse()?;
path.segments.push_punct(punct);
let value = PathSegment::parse_helper(input, expr_style)?;
path.segments.push_value(value);
}
Ok(())
}
}
pub fn qpath(input: ParseStream, expr_style: bool) -> Result<(Option<QSelf>, Path)> {
if input.peek(Token![<]) {
let lt_token: Token![<] = input.parse()?;
let this: Type = input.parse()?;
let path = if input.peek(Token![as]) {
let as_token: Token![as] = input.parse()?;
let path: Path = input.parse()?;
Some((as_token, path))
} else {
None
};
let gt_token: Token![>] = input.parse()?;
let colon2_token: Token![::] = input.parse()?;
let mut rest = Punctuated::new();
loop {
let path = PathSegment::parse_helper(input, expr_style)?;
rest.push_value(path);
if !input.peek(Token![::]) {
break;
}
let punct: Token![::] = input.parse()?;
rest.push_punct(punct);
}
let (position, as_token, path) = match path {
Some((as_token, mut path)) => {
let pos = path.segments.len();
path.segments.push_punct(colon2_token);
path.segments.extend(rest.into_pairs());
(pos, Some(as_token), path)
}
None => {
let path = Path {
leading_colon: Some(colon2_token),
segments: rest,
};
(0, None, path)
}
};
let qself = QSelf {
lt_token,
ty: Box::new(this),
position,
as_token,
gt_token,
};
Ok((Some(qself), path))
} else {
let path = Path::parse_helper(input, expr_style)?;
Ok((None, path))
}
}
}
#[cfg(feature = "printing")]
pub(crate) mod printing {
use super::*;
use crate::print::TokensOrDefault;
use proc_macro2::TokenStream;
use quote::ToTokens;
use std::cmp;
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for Path {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.leading_colon.to_tokens(tokens);
self.segments.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for PathSegment {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
self.arguments.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for PathArguments {
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
PathArguments::None => {}
PathArguments::AngleBracketed(arguments) => {
arguments.to_tokens(tokens);
}
PathArguments::Parenthesized(arguments) => {
arguments.to_tokens(tokens);
}
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for GenericArgument {
#[allow(clippy::match_same_arms)]
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
GenericArgument::Lifetime(lt) => lt.to_tokens(tokens),
GenericArgument::Type(ty) => ty.to_tokens(tokens),
GenericArgument::Const(e) => match *e {
Expr::Lit(_) => e.to_tokens(tokens),
// NOTE: We should probably support parsing blocks with only
// expressions in them without the full feature for const
// generics.
#[cfg(feature = "full")]
Expr::Block(_) => e.to_tokens(tokens),
// ERROR CORRECTION: Add braces to make sure that the
// generated code is valid.
_ => token::Brace::default().surround(tokens, |tokens| {
e.to_tokens(tokens);
}),
},
GenericArgument::Binding(tb) => tb.to_tokens(tokens),
GenericArgument::Constraint(tc) => tc.to_tokens(tokens),
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for AngleBracketedGenericArguments {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.colon2_token.to_tokens(tokens);
self.lt_token.to_tokens(tokens);
// Print lifetimes before types/consts/bindings, regardless of their
// order in self.args.
let mut trailing_or_empty = true;
for param in self.args.pairs() {
match **param.value() {
GenericArgument::Lifetime(_) => {
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
GenericArgument::Type(_)
| GenericArgument::Const(_)
| GenericArgument::Binding(_)
| GenericArgument::Constraint(_) => {}
}
}
for param in self.args.pairs() {
match **param.value() {
GenericArgument::Type(_)
| GenericArgument::Const(_)
| GenericArgument::Binding(_)
| GenericArgument::Constraint(_) => {
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
}
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
GenericArgument::Lifetime(_) => {}
}
}
self.gt_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for Binding {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
self.eq_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for Constraint {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
self.colon_token.to_tokens(tokens);
self.bounds.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ParenthesizedGenericArguments {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.paren_token.surround(tokens, |tokens| {
self.inputs.to_tokens(tokens);
});
self.output.to_tokens(tokens);
}
}
pub(crate) fn print_path(tokens: &mut TokenStream, qself: &Option<QSelf>, path: &Path) {
let qself = match qself {
Some(qself) => qself,
None => {
path.to_tokens(tokens);
return;
}
};
qself.lt_token.to_tokens(tokens);
qself.ty.to_tokens(tokens);
let pos = cmp::min(qself.position, path.segments.len());
let mut segments = path.segments.pairs();
if pos > 0 {
TokensOrDefault(&qself.as_token).to_tokens(tokens);
path.leading_colon.to_tokens(tokens);
for (i, segment) in segments.by_ref().take(pos).enumerate() {
if i + 1 == pos {
segment.value().to_tokens(tokens);
qself.gt_token.to_tokens(tokens);
segment.punct().to_tokens(tokens);
} else {
segment.to_tokens(tokens);
}
}
} else {
qself.gt_token.to_tokens(tokens);
path.leading_colon.to_tokens(tokens);
}
for segment in segments {
segment.to_tokens(tokens);
}
}src/ty.rs (line 492)
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pub(crate) fn ambig_ty(
input: ParseStream,
allow_plus: bool,
allow_group_generic: bool,
) -> Result<Type> {
let begin = input.fork();
if input.peek(token::Group) {
let mut group: TypeGroup = input.parse()?;
if input.peek(Token![::]) && input.peek3(Ident::peek_any) {
if let Type::Path(mut ty) = *group.elem {
Path::parse_rest(input, &mut ty.path, false)?;
return Ok(Type::Path(ty));
} else {
return Ok(Type::Path(TypePath {
qself: Some(QSelf {
lt_token: Token,
position: 0,
as_token: None,
gt_token: Token,
ty: group.elem,
}),
path: Path::parse_helper(input, false)?,
}));
}
} else if input.peek(Token![<]) && allow_group_generic
|| input.peek(Token![::]) && input.peek3(Token![<])
{
if let Type::Path(mut ty) = *group.elem {
let arguments = &mut ty.path.segments.last_mut().unwrap().arguments;
if let PathArguments::None = arguments {
*arguments = PathArguments::AngleBracketed(input.parse()?);
Path::parse_rest(input, &mut ty.path, false)?;
return Ok(Type::Path(ty));
} else {
group.elem = Box::new(Type::Path(ty));
}
}
}
return Ok(Type::Group(group));
}
let mut lifetimes = None::<BoundLifetimes>;
let mut lookahead = input.lookahead1();
if lookahead.peek(Token![for]) {
lifetimes = input.parse()?;
lookahead = input.lookahead1();
if !lookahead.peek(Ident)
&& !lookahead.peek(Token![fn])
&& !lookahead.peek(Token![unsafe])
&& !lookahead.peek(Token![extern])
&& !lookahead.peek(Token![super])
&& !lookahead.peek(Token![self])
&& !lookahead.peek(Token![Self])
&& !lookahead.peek(Token![crate])
|| input.peek(Token![dyn])
{
return Err(lookahead.error());
}
}
if lookahead.peek(token::Paren) {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(Type::Tuple(TypeTuple {
paren_token,
elems: Punctuated::new(),
}));
}
if content.peek(Lifetime) {
return Ok(Type::Paren(TypeParen {
paren_token,
elem: Box::new(Type::TraitObject(content.parse()?)),
}));
}
if content.peek(Token![?]) {
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds: {
let mut bounds = Punctuated::new();
bounds.push_value(TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
..content.parse()?
}));
while let Some(plus) = input.parse()? {
bounds.push_punct(plus);
bounds.push_value(input.parse()?);
}
bounds
},
}));
}
let mut first: Type = content.parse()?;
if content.peek(Token![,]) {
return Ok(Type::Tuple(TypeTuple {
paren_token,
elems: {
let mut elems = Punctuated::new();
elems.push_value(first);
elems.push_punct(content.parse()?);
while !content.is_empty() {
elems.push_value(content.parse()?);
if content.is_empty() {
break;
}
elems.push_punct(content.parse()?);
}
elems
},
}));
}
if allow_plus && input.peek(Token![+]) {
loop {
let first = match first {
Type::Path(TypePath { qself: None, path }) => {
TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
modifier: TraitBoundModifier::None,
lifetimes: None,
path,
})
}
Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
}) => {
if bounds.len() > 1 || bounds.trailing_punct() {
first = Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
});
break;
}
match bounds.into_iter().next().unwrap() {
TypeParamBound::Trait(trait_bound) => {
TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
..trait_bound
})
}
other @ TypeParamBound::Lifetime(_) => other,
}
}
_ => break,
};
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds: {
let mut bounds = Punctuated::new();
bounds.push_value(first);
while let Some(plus) = input.parse()? {
bounds.push_punct(plus);
bounds.push_value(input.parse()?);
}
bounds
},
}));
}
}
Ok(Type::Paren(TypeParen {
paren_token,
elem: Box::new(first),
}))
} else if lookahead.peek(Token![fn])
|| lookahead.peek(Token![unsafe])
|| lookahead.peek(Token![extern])
{
let allow_mut_self = true;
if let Some(mut bare_fn) = parse_bare_fn(input, allow_mut_self)? {
bare_fn.lifetimes = lifetimes;
Ok(Type::BareFn(bare_fn))
} else {
Ok(Type::Verbatim(verbatim::between(begin, input)))
}
} else if lookahead.peek(Ident)
|| input.peek(Token![super])
|| input.peek(Token![self])
|| input.peek(Token![Self])
|| input.peek(Token![crate])
|| lookahead.peek(Token![::])
|| lookahead.peek(Token![<])
{
let dyn_token: Option<Token![dyn]> = input.parse()?;
if let Some(dyn_token) = dyn_token {
let dyn_span = dyn_token.span;
let star_token: Option<Token![*]> = input.parse()?;
let bounds = TypeTraitObject::parse_bounds(dyn_span, input, allow_plus)?;
return Ok(if star_token.is_some() {
Type::Verbatim(verbatim::between(begin, input))
} else {
Type::TraitObject(TypeTraitObject {
dyn_token: Some(dyn_token),
bounds,
})
});
}
let ty: TypePath = input.parse()?;
if ty.qself.is_some() {
return Ok(Type::Path(ty));
}
if input.peek(Token![!]) && !input.peek(Token![!=]) {
let mut contains_arguments = false;
for segment in &ty.path.segments {
match segment.arguments {
PathArguments::None => {}
PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => {
contains_arguments = true;
}
}
}
if !contains_arguments {
let bang_token: Token![!] = input.parse()?;
let (delimiter, tokens) = mac::parse_delimiter(input)?;
return Ok(Type::Macro(TypeMacro {
mac: Macro {
path: ty.path,
bang_token,
delimiter,
tokens,
},
}));
}
}
if lifetimes.is_some() || allow_plus && input.peek(Token![+]) {
let mut bounds = Punctuated::new();
bounds.push_value(TypeParamBound::Trait(TraitBound {
paren_token: None,
modifier: TraitBoundModifier::None,
lifetimes,
path: ty.path,
}));
if allow_plus {
while input.peek(Token![+]) {
bounds.push_punct(input.parse()?);
if !(input.peek(Ident::peek_any)
|| input.peek(Token![::])
|| input.peek(Token![?])
|| input.peek(Lifetime)
|| input.peek(token::Paren))
{
break;
}
bounds.push_value(input.parse()?);
}
}
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
}));
}
Ok(Type::Path(ty))
} else if lookahead.peek(token::Bracket) {
let content;
let bracket_token = bracketed!(content in input);
let elem: Type = content.parse()?;
if content.peek(Token![;]) {
Ok(Type::Array(TypeArray {
bracket_token,
elem: Box::new(elem),
semi_token: content.parse()?,
len: content.parse()?,
}))
} else {
Ok(Type::Slice(TypeSlice {
bracket_token,
elem: Box::new(elem),
}))
}
} else if lookahead.peek(Token![*]) {
input.parse().map(Type::Ptr)
} else if lookahead.peek(Token![&]) {
input.parse().map(Type::Reference)
} else if lookahead.peek(Token![!]) && !input.peek(Token![=]) {
input.parse().map(Type::Never)
} else if lookahead.peek(Token![impl]) {
TypeImplTrait::parse(input, allow_plus).map(Type::ImplTrait)
} else if lookahead.peek(Token![_]) {
input.parse().map(Type::Infer)
} else if lookahead.peek(Lifetime) {
input.parse().map(Type::TraitObject)
} else {
Err(lookahead.error())
}
}sourcepub fn first(&self) -> Option<&T>
pub fn first(&self) -> Option<&T>
Borrows the first element in this sequence.
Examples found in repository?
src/item.rs (line 908)
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pub fn receiver(&self) -> Option<&FnArg> {
let arg = self.inputs.first()?;
match arg {
FnArg::Receiver(_) => Some(arg),
FnArg::Typed(PatType { pat, .. }) => {
if let Pat::Ident(PatIdent { ident, .. }) = &**pat {
if ident == "self" {
return Some(arg);
}
}
None
}
}
}sourcepub fn first_mut(&mut self) -> Option<&mut T>
pub fn first_mut(&mut self) -> Option<&mut T>
Mutably borrows the first element in this sequence.
sourcepub fn last(&self) -> Option<&T>
pub fn last(&self) -> Option<&T>
Borrows the last element in this sequence.
Examples found in repository?
src/ty.rs (line 843)
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fn parse(input: ParseStream) -> Result<Self> {
let expr_style = false;
let (qself, mut path) = path::parsing::qpath(input, expr_style)?;
while path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let allow_associated_type = cfg!(feature = "full")
&& match &args.output {
ReturnType::Default => true,
ReturnType::Type(_, ty) => match **ty {
// TODO: probably some of the other kinds allow this too.
Type::Paren(_) => true,
_ => false,
},
};
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
if allow_associated_type {
Path::parse_rest(input, &mut path, expr_style)?;
}
}
Ok(TypePath { qself, path })
}More examples
src/generics.rs (line 872)
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fn parse(input: ParseStream) -> Result<Self> {
#[cfg(feature = "full")]
let tilde_const = if input.peek(Token![~]) && input.peek2(Token![const]) {
let tilde_token = input.parse::<Token![~]>()?;
let const_token = input.parse::<Token![const]>()?;
Some((tilde_token, const_token))
} else {
None
};
let modifier: TraitBoundModifier = input.parse()?;
let lifetimes: Option<BoundLifetimes> = input.parse()?;
let mut path: Path = input.parse()?;
if path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
}
#[cfg(feature = "full")]
{
if let Some((tilde_token, const_token)) = tilde_const {
path.segments.insert(
0,
PathSegment {
ident: Ident::new("const", const_token.span),
arguments: PathArguments::None,
},
);
let (_const, punct) = path.segments.pairs_mut().next().unwrap().into_tuple();
*punct.unwrap() = Token;
}
}
Ok(TraitBound {
paren_token: None,
modifier,
lifetimes,
path,
})
}sourcepub fn last_mut(&mut self) -> Option<&mut T>
pub fn last_mut(&mut self) -> Option<&mut T>
Mutably borrows the last element in this sequence.
Examples found in repository?
src/item.rs (line 1446)
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fn pop_variadic(args: &mut Punctuated<FnArg, Token![,]>) -> Option<Variadic> {
let trailing_punct = args.trailing_punct();
let last = match args.last_mut()? {
FnArg::Typed(last) => last,
_ => return None,
};
let ty = match last.ty.as_ref() {
Type::Verbatim(ty) => ty,
_ => return None,
};
let mut variadic = Variadic {
attrs: Vec::new(),
dots: parse2(ty.clone()).ok()?,
};
if let Pat::Verbatim(pat) = last.pat.as_ref() {
if pat.to_string() == "..." && !trailing_punct {
variadic.attrs = mem::replace(&mut last.attrs, Vec::new());
args.pop();
}
}
Some(variadic)
}More examples
src/generics.rs (line 878)
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fn parse(input: ParseStream) -> Result<Self> {
#[cfg(feature = "full")]
let tilde_const = if input.peek(Token![~]) && input.peek2(Token![const]) {
let tilde_token = input.parse::<Token![~]>()?;
let const_token = input.parse::<Token![const]>()?;
Some((tilde_token, const_token))
} else {
None
};
let modifier: TraitBoundModifier = input.parse()?;
let lifetimes: Option<BoundLifetimes> = input.parse()?;
let mut path: Path = input.parse()?;
if path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
}
#[cfg(feature = "full")]
{
if let Some((tilde_token, const_token)) = tilde_const {
path.segments.insert(
0,
PathSegment {
ident: Ident::new("const", const_token.span),
arguments: PathArguments::None,
},
);
let (_const, punct) = path.segments.pairs_mut().next().unwrap().into_tuple();
*punct.unwrap() = Token;
}
}
Ok(TraitBound {
paren_token: None,
modifier,
lifetimes,
path,
})
}src/ty.rs (line 394)
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pub(crate) fn ambig_ty(
input: ParseStream,
allow_plus: bool,
allow_group_generic: bool,
) -> Result<Type> {
let begin = input.fork();
if input.peek(token::Group) {
let mut group: TypeGroup = input.parse()?;
if input.peek(Token![::]) && input.peek3(Ident::peek_any) {
if let Type::Path(mut ty) = *group.elem {
Path::parse_rest(input, &mut ty.path, false)?;
return Ok(Type::Path(ty));
} else {
return Ok(Type::Path(TypePath {
qself: Some(QSelf {
lt_token: Token,
position: 0,
as_token: None,
gt_token: Token,
ty: group.elem,
}),
path: Path::parse_helper(input, false)?,
}));
}
} else if input.peek(Token![<]) && allow_group_generic
|| input.peek(Token![::]) && input.peek3(Token![<])
{
if let Type::Path(mut ty) = *group.elem {
let arguments = &mut ty.path.segments.last_mut().unwrap().arguments;
if let PathArguments::None = arguments {
*arguments = PathArguments::AngleBracketed(input.parse()?);
Path::parse_rest(input, &mut ty.path, false)?;
return Ok(Type::Path(ty));
} else {
group.elem = Box::new(Type::Path(ty));
}
}
}
return Ok(Type::Group(group));
}
let mut lifetimes = None::<BoundLifetimes>;
let mut lookahead = input.lookahead1();
if lookahead.peek(Token![for]) {
lifetimes = input.parse()?;
lookahead = input.lookahead1();
if !lookahead.peek(Ident)
&& !lookahead.peek(Token![fn])
&& !lookahead.peek(Token![unsafe])
&& !lookahead.peek(Token![extern])
&& !lookahead.peek(Token![super])
&& !lookahead.peek(Token![self])
&& !lookahead.peek(Token![Self])
&& !lookahead.peek(Token![crate])
|| input.peek(Token![dyn])
{
return Err(lookahead.error());
}
}
if lookahead.peek(token::Paren) {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(Type::Tuple(TypeTuple {
paren_token,
elems: Punctuated::new(),
}));
}
if content.peek(Lifetime) {
return Ok(Type::Paren(TypeParen {
paren_token,
elem: Box::new(Type::TraitObject(content.parse()?)),
}));
}
if content.peek(Token![?]) {
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds: {
let mut bounds = Punctuated::new();
bounds.push_value(TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
..content.parse()?
}));
while let Some(plus) = input.parse()? {
bounds.push_punct(plus);
bounds.push_value(input.parse()?);
}
bounds
},
}));
}
let mut first: Type = content.parse()?;
if content.peek(Token![,]) {
return Ok(Type::Tuple(TypeTuple {
paren_token,
elems: {
let mut elems = Punctuated::new();
elems.push_value(first);
elems.push_punct(content.parse()?);
while !content.is_empty() {
elems.push_value(content.parse()?);
if content.is_empty() {
break;
}
elems.push_punct(content.parse()?);
}
elems
},
}));
}
if allow_plus && input.peek(Token![+]) {
loop {
let first = match first {
Type::Path(TypePath { qself: None, path }) => {
TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
modifier: TraitBoundModifier::None,
lifetimes: None,
path,
})
}
Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
}) => {
if bounds.len() > 1 || bounds.trailing_punct() {
first = Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
});
break;
}
match bounds.into_iter().next().unwrap() {
TypeParamBound::Trait(trait_bound) => {
TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
..trait_bound
})
}
other @ TypeParamBound::Lifetime(_) => other,
}
}
_ => break,
};
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds: {
let mut bounds = Punctuated::new();
bounds.push_value(first);
while let Some(plus) = input.parse()? {
bounds.push_punct(plus);
bounds.push_value(input.parse()?);
}
bounds
},
}));
}
}
Ok(Type::Paren(TypeParen {
paren_token,
elem: Box::new(first),
}))
} else if lookahead.peek(Token![fn])
|| lookahead.peek(Token![unsafe])
|| lookahead.peek(Token![extern])
{
let allow_mut_self = true;
if let Some(mut bare_fn) = parse_bare_fn(input, allow_mut_self)? {
bare_fn.lifetimes = lifetimes;
Ok(Type::BareFn(bare_fn))
} else {
Ok(Type::Verbatim(verbatim::between(begin, input)))
}
} else if lookahead.peek(Ident)
|| input.peek(Token![super])
|| input.peek(Token![self])
|| input.peek(Token![Self])
|| input.peek(Token![crate])
|| lookahead.peek(Token![::])
|| lookahead.peek(Token![<])
{
let dyn_token: Option<Token![dyn]> = input.parse()?;
if let Some(dyn_token) = dyn_token {
let dyn_span = dyn_token.span;
let star_token: Option<Token![*]> = input.parse()?;
let bounds = TypeTraitObject::parse_bounds(dyn_span, input, allow_plus)?;
return Ok(if star_token.is_some() {
Type::Verbatim(verbatim::between(begin, input))
} else {
Type::TraitObject(TypeTraitObject {
dyn_token: Some(dyn_token),
bounds,
})
});
}
let ty: TypePath = input.parse()?;
if ty.qself.is_some() {
return Ok(Type::Path(ty));
}
if input.peek(Token![!]) && !input.peek(Token![!=]) {
let mut contains_arguments = false;
for segment in &ty.path.segments {
match segment.arguments {
PathArguments::None => {}
PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => {
contains_arguments = true;
}
}
}
if !contains_arguments {
let bang_token: Token![!] = input.parse()?;
let (delimiter, tokens) = mac::parse_delimiter(input)?;
return Ok(Type::Macro(TypeMacro {
mac: Macro {
path: ty.path,
bang_token,
delimiter,
tokens,
},
}));
}
}
if lifetimes.is_some() || allow_plus && input.peek(Token![+]) {
let mut bounds = Punctuated::new();
bounds.push_value(TypeParamBound::Trait(TraitBound {
paren_token: None,
modifier: TraitBoundModifier::None,
lifetimes,
path: ty.path,
}));
if allow_plus {
while input.peek(Token![+]) {
bounds.push_punct(input.parse()?);
if !(input.peek(Ident::peek_any)
|| input.peek(Token![::])
|| input.peek(Token![?])
|| input.peek(Lifetime)
|| input.peek(token::Paren))
{
break;
}
bounds.push_value(input.parse()?);
}
}
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
}));
}
Ok(Type::Path(ty))
} else if lookahead.peek(token::Bracket) {
let content;
let bracket_token = bracketed!(content in input);
let elem: Type = content.parse()?;
if content.peek(Token![;]) {
Ok(Type::Array(TypeArray {
bracket_token,
elem: Box::new(elem),
semi_token: content.parse()?,
len: content.parse()?,
}))
} else {
Ok(Type::Slice(TypeSlice {
bracket_token,
elem: Box::new(elem),
}))
}
} else if lookahead.peek(Token![*]) {
input.parse().map(Type::Ptr)
} else if lookahead.peek(Token![&]) {
input.parse().map(Type::Reference)
} else if lookahead.peek(Token![!]) && !input.peek(Token![=]) {
input.parse().map(Type::Never)
} else if lookahead.peek(Token![impl]) {
TypeImplTrait::parse(input, allow_plus).map(Type::ImplTrait)
} else if lookahead.peek(Token![_]) {
input.parse().map(Type::Infer)
} else if lookahead.peek(Lifetime) {
input.parse().map(Type::TraitObject)
} else {
Err(lookahead.error())
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeSlice {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(TypeSlice {
bracket_token: bracketed!(content in input),
elem: content.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeArray {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(TypeArray {
bracket_token: bracketed!(content in input),
elem: content.parse()?,
semi_token: content.parse()?,
len: content.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypePtr {
fn parse(input: ParseStream) -> Result<Self> {
let star_token: Token![*] = input.parse()?;
let lookahead = input.lookahead1();
let (const_token, mutability) = if lookahead.peek(Token![const]) {
(Some(input.parse()?), None)
} else if lookahead.peek(Token![mut]) {
(None, Some(input.parse()?))
} else {
return Err(lookahead.error());
};
Ok(TypePtr {
star_token,
const_token,
mutability,
elem: Box::new(input.call(Type::without_plus)?),
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeReference {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TypeReference {
and_token: input.parse()?,
lifetime: input.parse()?,
mutability: input.parse()?,
// & binds tighter than +, so we don't allow + here.
elem: Box::new(input.call(Type::without_plus)?),
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeBareFn {
fn parse(input: ParseStream) -> Result<Self> {
let allow_mut_self = false;
parse_bare_fn(input, allow_mut_self).map(Option::unwrap)
}
}
fn parse_bare_fn(input: ParseStream, allow_mut_self: bool) -> Result<Option<TypeBareFn>> {
let args;
let mut variadic = None;
let mut has_mut_self = false;
let bare_fn = TypeBareFn {
lifetimes: input.parse()?,
unsafety: input.parse()?,
abi: input.parse()?,
fn_token: input.parse()?,
paren_token: parenthesized!(args in input),
inputs: {
let mut inputs = Punctuated::new();
while !args.is_empty() {
let attrs = args.call(Attribute::parse_outer)?;
if inputs.empty_or_trailing() && args.peek(Token![...]) {
variadic = Some(Variadic {
attrs,
dots: args.parse()?,
});
break;
}
if let Some(arg) = parse_bare_fn_arg(&args, allow_mut_self)? {
inputs.push_value(BareFnArg { attrs, ..arg });
} else {
has_mut_self = true;
}
if args.is_empty() {
break;
}
let comma = args.parse()?;
if !has_mut_self {
inputs.push_punct(comma);
}
}
inputs
},
variadic,
output: input.call(ReturnType::without_plus)?,
};
if has_mut_self {
Ok(None)
} else {
Ok(Some(bare_fn))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeNever {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TypeNever {
bang_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeInfer {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TypeInfer {
underscore_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeTuple {
fn parse(input: ParseStream) -> Result<Self> {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(TypeTuple {
paren_token,
elems: Punctuated::new(),
});
}
let first: Type = content.parse()?;
Ok(TypeTuple {
paren_token,
elems: {
let mut elems = Punctuated::new();
elems.push_value(first);
elems.push_punct(content.parse()?);
while !content.is_empty() {
elems.push_value(content.parse()?);
if content.is_empty() {
break;
}
elems.push_punct(content.parse()?);
}
elems
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeMacro {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TypeMacro {
mac: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypePath {
fn parse(input: ParseStream) -> Result<Self> {
let expr_style = false;
let (qself, mut path) = path::parsing::qpath(input, expr_style)?;
while path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let allow_associated_type = cfg!(feature = "full")
&& match &args.output {
ReturnType::Default => true,
ReturnType::Type(_, ty) => match **ty {
// TODO: probably some of the other kinds allow this too.
Type::Paren(_) => true,
_ => false,
},
};
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
if allow_associated_type {
Path::parse_rest(input, &mut path, expr_style)?;
}
}
Ok(TypePath { qself, path })
}sourcepub fn iter(&self) -> Iter<'_, T> ⓘ
pub fn iter(&self) -> Iter<'_, T> ⓘ
Returns an iterator over borrowed syntax tree nodes of type &T.
Examples found in repository?
src/punctuated.rs (line 87)
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pub fn first(&self) -> Option<&T> {
self.iter().next()
}
/// Mutably borrows the first element in this sequence.
pub fn first_mut(&mut self) -> Option<&mut T> {
self.iter_mut().next()
}
/// Borrows the last element in this sequence.
pub fn last(&self) -> Option<&T> {
self.iter().next_back()
}
/// Mutably borrows the last element in this sequence.
pub fn last_mut(&mut self) -> Option<&mut T> {
self.iter_mut().next_back()
}
/// Returns an iterator over borrowed syntax tree nodes of type `&T`.
pub fn iter(&self) -> Iter<T> {
Iter {
inner: Box::new(NoDrop::new(PrivateIter {
inner: self.inner.iter(),
last: self.last.as_ref().map(Box::as_ref).into_iter(),
})),
}
}
/// Returns an iterator over mutably borrowed syntax tree nodes of type
/// `&mut T`.
pub fn iter_mut(&mut self) -> IterMut<T> {
IterMut {
inner: Box::new(NoDrop::new(PrivateIterMut {
inner: self.inner.iter_mut(),
last: self.last.as_mut().map(Box::as_mut).into_iter(),
})),
}
}
/// Returns an iterator over the contents of this sequence as borrowed
/// punctuated pairs.
pub fn pairs(&self) -> Pairs<T, P> {
Pairs {
inner: self.inner.iter(),
last: self.last.as_ref().map(Box::as_ref).into_iter(),
}
}
/// Returns an iterator over the contents of this sequence as mutably
/// borrowed punctuated pairs.
pub fn pairs_mut(&mut self) -> PairsMut<T, P> {
PairsMut {
inner: self.inner.iter_mut(),
last: self.last.as_mut().map(Box::as_mut).into_iter(),
}
}
/// Returns an iterator over the contents of this sequence as owned
/// punctuated pairs.
pub fn into_pairs(self) -> IntoPairs<T, P> {
IntoPairs {
inner: self.inner.into_iter(),
last: self.last.map(|t| *t).into_iter(),
}
}
/// Appends a syntax tree node onto the end of this punctuated sequence. The
/// sequence must previously have a trailing punctuation.
///
/// Use [`push`] instead if the punctuated sequence may or may not already
/// have trailing punctuation.
///
/// [`push`]: Punctuated::push
///
/// # Panics
///
/// Panics if the sequence does not already have a trailing punctuation when
/// this method is called.
pub fn push_value(&mut self, value: T) {
assert!(
self.empty_or_trailing(),
"Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation",
);
self.last = Some(Box::new(value));
}
/// Appends a trailing punctuation onto the end of this punctuated sequence.
/// The sequence must be non-empty and must not already have trailing
/// punctuation.
///
/// # Panics
///
/// Panics if the sequence is empty or already has a trailing punctuation.
pub fn push_punct(&mut self, punctuation: P) {
assert!(
self.last.is_some(),
"Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation",
);
let last = self.last.take().unwrap();
self.inner.push((*last, punctuation));
}
/// Removes the last punctuated pair from this sequence, or `None` if the
/// sequence is empty.
pub fn pop(&mut self) -> Option<Pair<T, P>> {
if self.last.is_some() {
self.last.take().map(|t| Pair::End(*t))
} else {
self.inner.pop().map(|(t, p)| Pair::Punctuated(t, p))
}
}
/// Determines whether this punctuated sequence ends with a trailing
/// punctuation.
pub fn trailing_punct(&self) -> bool {
self.last.is_none() && !self.is_empty()
}
/// Returns true if either this `Punctuated` is empty, or it has a trailing
/// punctuation.
///
/// Equivalent to `punctuated.is_empty() || punctuated.trailing_punct()`.
pub fn empty_or_trailing(&self) -> bool {
self.last.is_none()
}
/// Appends a syntax tree node onto the end of this punctuated sequence.
///
/// If there is not a trailing punctuation in this sequence when this method
/// is called, the default value of punctuation type `P` is inserted before
/// the given value of type `T`.
pub fn push(&mut self, value: T)
where
P: Default,
{
if !self.empty_or_trailing() {
self.push_punct(Default::default());
}
self.push_value(value);
}
/// Inserts an element at position `index`.
///
/// # Panics
///
/// Panics if `index` is greater than the number of elements previously in
/// this punctuated sequence.
pub fn insert(&mut self, index: usize, value: T)
where
P: Default,
{
assert!(
index <= self.len(),
"Punctuated::insert: index out of range",
);
if index == self.len() {
self.push(value);
} else {
self.inner.insert(index, (value, Default::default()));
}
}
/// Clears the sequence of all values and punctuation, making it empty.
pub fn clear(&mut self) {
self.inner.clear();
self.last = None;
}
/// Parses zero or more occurrences of `T` separated by punctuation of type
/// `P`, with optional trailing punctuation.
///
/// Parsing continues until the end of this parse stream. The entire content
/// of this parse stream must consist of `T` and `P`.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Parse,
{
Self::parse_terminated_with(input, T::parse)
}
/// Parses zero or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, with optional trailing
/// punctuation.
///
/// Like [`parse_terminated`], the entire content of this stream is expected
/// to be parsed.
///
/// [`parse_terminated`]: Punctuated::parse_terminated
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
}
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<T, P> Clone for Punctuated<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
Punctuated {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Eq for Punctuated<T, P>
where
T: Eq,
P: Eq,
{
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> PartialEq for Punctuated<T, P>
where
T: PartialEq,
P: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
let Punctuated { inner, last } = self;
*inner == other.inner && *last == other.last
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Hash for Punctuated<T, P>
where
T: Hash,
P: Hash,
{
fn hash<H: Hasher>(&self, state: &mut H) {
let Punctuated { inner, last } = self;
inner.hash(state);
last.hash(state);
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut list = f.debug_list();
for (t, p) in &self.inner {
list.entry(t);
list.entry(p);
}
if let Some(last) = &self.last {
list.entry(last);
}
list.finish()
}
}
impl<T, P> FromIterator<T> for Punctuated<T, P>
where
P: Default,
{
fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<T> for Punctuated<T, P>
where
P: Default,
{
fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
for value in i {
self.push(value);
}
}
}
impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P> {
fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P> {
fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {
assert!(
self.empty_or_trailing(),
"Punctuated::extend: Punctuated is not empty or does not have a trailing punctuation",
);
let mut nomore = false;
for pair in i {
if nomore {
panic!("Punctuated extended with items after a Pair::End");
}
match pair {
Pair::Punctuated(a, b) => self.inner.push((a, b)),
Pair::End(a) => {
self.last = Some(Box::new(a));
nomore = true;
}
}
}
}
}
impl<T, P> IntoIterator for Punctuated<T, P> {
type Item = T;
type IntoIter = IntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
let mut elements = Vec::with_capacity(self.len());
elements.extend(self.inner.into_iter().map(|pair| pair.0));
elements.extend(self.last.map(|t| *t));
IntoIter {
inner: elements.into_iter(),
}
}
}
impl<'a, T, P> IntoIterator for &'a Punctuated<T, P> {
type Item = &'a T;
type IntoIter = Iter<'a, T>;
fn into_iter(self) -> Self::IntoIter {
Punctuated::iter(self)
}More examples
src/generics.rs (line 115)
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pub fn type_params(&self) -> TypeParams {
TypeParams(self.params.iter())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &mut </code><a
/// href="struct.TypeParam.html"><code
/// style="padding-left:0;padding-right:0;">TypeParam</code></a><code
/// style="padding-left:0;">></code>
/// over the type parameters in `self.params`.
pub fn type_params_mut(&mut self) -> TypeParamsMut {
TypeParamsMut(self.params.iter_mut())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &</code><a
/// href="struct.LifetimeDef.html"><code
/// style="padding-left:0;padding-right:0;">LifetimeDef</code></a><code
/// style="padding-left:0;">></code>
/// over the lifetime parameters in `self.params`.
pub fn lifetimes(&self) -> Lifetimes {
Lifetimes(self.params.iter())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &mut </code><a
/// href="struct.LifetimeDef.html"><code
/// style="padding-left:0;padding-right:0;">LifetimeDef</code></a><code
/// style="padding-left:0;">></code>
/// over the lifetime parameters in `self.params`.
pub fn lifetimes_mut(&mut self) -> LifetimesMut {
LifetimesMut(self.params.iter_mut())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &</code><a
/// href="struct.ConstParam.html"><code
/// style="padding-left:0;padding-right:0;">ConstParam</code></a><code
/// style="padding-left:0;">></code>
/// over the constant parameters in `self.params`.
pub fn const_params(&self) -> ConstParams {
ConstParams(self.params.iter())
}sourcepub fn iter_mut(&mut self) -> IterMut<'_, T> ⓘ
pub fn iter_mut(&mut self) -> IterMut<'_, T> ⓘ
Returns an iterator over mutably borrowed syntax tree nodes of type
&mut T.
Examples found in repository?
src/punctuated.rs (line 92)
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pub fn first_mut(&mut self) -> Option<&mut T> {
self.iter_mut().next()
}
/// Borrows the last element in this sequence.
pub fn last(&self) -> Option<&T> {
self.iter().next_back()
}
/// Mutably borrows the last element in this sequence.
pub fn last_mut(&mut self) -> Option<&mut T> {
self.iter_mut().next_back()
}
/// Returns an iterator over borrowed syntax tree nodes of type `&T`.
pub fn iter(&self) -> Iter<T> {
Iter {
inner: Box::new(NoDrop::new(PrivateIter {
inner: self.inner.iter(),
last: self.last.as_ref().map(Box::as_ref).into_iter(),
})),
}
}
/// Returns an iterator over mutably borrowed syntax tree nodes of type
/// `&mut T`.
pub fn iter_mut(&mut self) -> IterMut<T> {
IterMut {
inner: Box::new(NoDrop::new(PrivateIterMut {
inner: self.inner.iter_mut(),
last: self.last.as_mut().map(Box::as_mut).into_iter(),
})),
}
}
/// Returns an iterator over the contents of this sequence as borrowed
/// punctuated pairs.
pub fn pairs(&self) -> Pairs<T, P> {
Pairs {
inner: self.inner.iter(),
last: self.last.as_ref().map(Box::as_ref).into_iter(),
}
}
/// Returns an iterator over the contents of this sequence as mutably
/// borrowed punctuated pairs.
pub fn pairs_mut(&mut self) -> PairsMut<T, P> {
PairsMut {
inner: self.inner.iter_mut(),
last: self.last.as_mut().map(Box::as_mut).into_iter(),
}
}
/// Returns an iterator over the contents of this sequence as owned
/// punctuated pairs.
pub fn into_pairs(self) -> IntoPairs<T, P> {
IntoPairs {
inner: self.inner.into_iter(),
last: self.last.map(|t| *t).into_iter(),
}
}
/// Appends a syntax tree node onto the end of this punctuated sequence. The
/// sequence must previously have a trailing punctuation.
///
/// Use [`push`] instead if the punctuated sequence may or may not already
/// have trailing punctuation.
///
/// [`push`]: Punctuated::push
///
/// # Panics
///
/// Panics if the sequence does not already have a trailing punctuation when
/// this method is called.
pub fn push_value(&mut self, value: T) {
assert!(
self.empty_or_trailing(),
"Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation",
);
self.last = Some(Box::new(value));
}
/// Appends a trailing punctuation onto the end of this punctuated sequence.
/// The sequence must be non-empty and must not already have trailing
/// punctuation.
///
/// # Panics
///
/// Panics if the sequence is empty or already has a trailing punctuation.
pub fn push_punct(&mut self, punctuation: P) {
assert!(
self.last.is_some(),
"Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation",
);
let last = self.last.take().unwrap();
self.inner.push((*last, punctuation));
}
/// Removes the last punctuated pair from this sequence, or `None` if the
/// sequence is empty.
pub fn pop(&mut self) -> Option<Pair<T, P>> {
if self.last.is_some() {
self.last.take().map(|t| Pair::End(*t))
} else {
self.inner.pop().map(|(t, p)| Pair::Punctuated(t, p))
}
}
/// Determines whether this punctuated sequence ends with a trailing
/// punctuation.
pub fn trailing_punct(&self) -> bool {
self.last.is_none() && !self.is_empty()
}
/// Returns true if either this `Punctuated` is empty, or it has a trailing
/// punctuation.
///
/// Equivalent to `punctuated.is_empty() || punctuated.trailing_punct()`.
pub fn empty_or_trailing(&self) -> bool {
self.last.is_none()
}
/// Appends a syntax tree node onto the end of this punctuated sequence.
///
/// If there is not a trailing punctuation in this sequence when this method
/// is called, the default value of punctuation type `P` is inserted before
/// the given value of type `T`.
pub fn push(&mut self, value: T)
where
P: Default,
{
if !self.empty_or_trailing() {
self.push_punct(Default::default());
}
self.push_value(value);
}
/// Inserts an element at position `index`.
///
/// # Panics
///
/// Panics if `index` is greater than the number of elements previously in
/// this punctuated sequence.
pub fn insert(&mut self, index: usize, value: T)
where
P: Default,
{
assert!(
index <= self.len(),
"Punctuated::insert: index out of range",
);
if index == self.len() {
self.push(value);
} else {
self.inner.insert(index, (value, Default::default()));
}
}
/// Clears the sequence of all values and punctuation, making it empty.
pub fn clear(&mut self) {
self.inner.clear();
self.last = None;
}
/// Parses zero or more occurrences of `T` separated by punctuation of type
/// `P`, with optional trailing punctuation.
///
/// Parsing continues until the end of this parse stream. The entire content
/// of this parse stream must consist of `T` and `P`.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Parse,
{
Self::parse_terminated_with(input, T::parse)
}
/// Parses zero or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, with optional trailing
/// punctuation.
///
/// Like [`parse_terminated`], the entire content of this stream is expected
/// to be parsed.
///
/// [`parse_terminated`]: Punctuated::parse_terminated
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
}
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<T, P> Clone for Punctuated<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
Punctuated {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Eq for Punctuated<T, P>
where
T: Eq,
P: Eq,
{
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> PartialEq for Punctuated<T, P>
where
T: PartialEq,
P: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
let Punctuated { inner, last } = self;
*inner == other.inner && *last == other.last
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Hash for Punctuated<T, P>
where
T: Hash,
P: Hash,
{
fn hash<H: Hasher>(&self, state: &mut H) {
let Punctuated { inner, last } = self;
inner.hash(state);
last.hash(state);
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut list = f.debug_list();
for (t, p) in &self.inner {
list.entry(t);
list.entry(p);
}
if let Some(last) = &self.last {
list.entry(last);
}
list.finish()
}
}
impl<T, P> FromIterator<T> for Punctuated<T, P>
where
P: Default,
{
fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<T> for Punctuated<T, P>
where
P: Default,
{
fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
for value in i {
self.push(value);
}
}
}
impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P> {
fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P> {
fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {
assert!(
self.empty_or_trailing(),
"Punctuated::extend: Punctuated is not empty or does not have a trailing punctuation",
);
let mut nomore = false;
for pair in i {
if nomore {
panic!("Punctuated extended with items after a Pair::End");
}
match pair {
Pair::Punctuated(a, b) => self.inner.push((a, b)),
Pair::End(a) => {
self.last = Some(Box::new(a));
nomore = true;
}
}
}
}
}
impl<T, P> IntoIterator for Punctuated<T, P> {
type Item = T;
type IntoIter = IntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
let mut elements = Vec::with_capacity(self.len());
elements.extend(self.inner.into_iter().map(|pair| pair.0));
elements.extend(self.last.map(|t| *t));
IntoIter {
inner: elements.into_iter(),
}
}
}
impl<'a, T, P> IntoIterator for &'a Punctuated<T, P> {
type Item = &'a T;
type IntoIter = Iter<'a, T>;
fn into_iter(self) -> Self::IntoIter {
Punctuated::iter(self)
}
}
impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P> {
type Item = &'a mut T;
type IntoIter = IterMut<'a, T>;
fn into_iter(self) -> Self::IntoIter {
Punctuated::iter_mut(self)
}More examples
src/generics.rs (line 126)
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pub fn type_params_mut(&mut self) -> TypeParamsMut {
TypeParamsMut(self.params.iter_mut())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &</code><a
/// href="struct.LifetimeDef.html"><code
/// style="padding-left:0;padding-right:0;">LifetimeDef</code></a><code
/// style="padding-left:0;">></code>
/// over the lifetime parameters in `self.params`.
pub fn lifetimes(&self) -> Lifetimes {
Lifetimes(self.params.iter())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &mut </code><a
/// href="struct.LifetimeDef.html"><code
/// style="padding-left:0;padding-right:0;">LifetimeDef</code></a><code
/// style="padding-left:0;">></code>
/// over the lifetime parameters in `self.params`.
pub fn lifetimes_mut(&mut self) -> LifetimesMut {
LifetimesMut(self.params.iter_mut())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &</code><a
/// href="struct.ConstParam.html"><code
/// style="padding-left:0;padding-right:0;">ConstParam</code></a><code
/// style="padding-left:0;">></code>
/// over the constant parameters in `self.params`.
pub fn const_params(&self) -> ConstParams {
ConstParams(self.params.iter())
}
/// Returns an
/// <code
/// style="padding-right:0;">Iterator<Item = &mut </code><a
/// href="struct.ConstParam.html"><code
/// style="padding-left:0;padding-right:0;">ConstParam</code></a><code
/// style="padding-left:0;">></code>
/// over the constant parameters in `self.params`.
pub fn const_params_mut(&mut self) -> ConstParamsMut {
ConstParamsMut(self.params.iter_mut())
}sourcepub fn pairs(&self) -> Pairs<'_, T, P> ⓘ
pub fn pairs(&self) -> Pairs<'_, T, P> ⓘ
Returns an iterator over the contents of this sequence as borrowed punctuated pairs.
Examples found in repository?
More examples
src/gen/visit.rs (line 800)
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pub fn visit_angle_bracketed_generic_arguments<'ast, V>(
v: &mut V,
node: &'ast AngleBracketedGenericArguments,
)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.colon2_token {
tokens_helper(v, &it.spans);
}
tokens_helper(v, &node.lt_token.spans);
for el in Punctuated::pairs(&node.args) {
let (it, p) = el.into_tuple();
v.visit_generic_argument(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
tokens_helper(v, &node.gt_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_arm<'ast, V>(v: &mut V, node: &'ast Arm)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_pat(&node.pat);
if let Some(it) = &node.guard {
tokens_helper(v, &(it).0.span);
v.visit_expr(&*(it).1);
}
tokens_helper(v, &node.fat_arrow_token.spans);
v.visit_expr(&*node.body);
if let Some(it) = &node.comma {
tokens_helper(v, &it.spans);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_attr_style<'ast, V>(v: &mut V, node: &'ast AttrStyle)
where
V: Visit<'ast> + ?Sized,
{
match node {
AttrStyle::Outer => {}
AttrStyle::Inner(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_attribute<'ast, V>(v: &mut V, node: &'ast Attribute)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.pound_token.spans);
v.visit_attr_style(&node.style);
tokens_helper(v, &node.bracket_token.span);
v.visit_path(&node.path);
skip!(node.tokens);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_bare_fn_arg<'ast, V>(v: &mut V, node: &'ast BareFnArg)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.name {
v.visit_ident(&(it).0);
tokens_helper(v, &(it).1.spans);
}
v.visit_type(&node.ty);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_bin_op<'ast, V>(v: &mut V, node: &'ast BinOp)
where
V: Visit<'ast> + ?Sized,
{
match node {
BinOp::Add(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Sub(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Mul(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Div(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Rem(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::And(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Or(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::BitXor(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::BitAnd(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::BitOr(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Shl(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Shr(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Eq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Lt(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Le(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Ne(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Ge(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::Gt(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::AddEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::SubEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::MulEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::DivEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::RemEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::BitXorEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::BitAndEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::BitOrEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::ShlEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
BinOp::ShrEq(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_binding<'ast, V>(v: &mut V, node: &'ast Binding)
where
V: Visit<'ast> + ?Sized,
{
v.visit_ident(&node.ident);
tokens_helper(v, &node.eq_token.spans);
v.visit_type(&node.ty);
}
#[cfg(feature = "full")]
pub fn visit_block<'ast, V>(v: &mut V, node: &'ast Block)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.brace_token.span);
for it in &node.stmts {
v.visit_stmt(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_bound_lifetimes<'ast, V>(v: &mut V, node: &'ast BoundLifetimes)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.for_token.span);
tokens_helper(v, &node.lt_token.spans);
for el in Punctuated::pairs(&node.lifetimes) {
let (it, p) = el.into_tuple();
v.visit_lifetime_def(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
tokens_helper(v, &node.gt_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_const_param<'ast, V>(v: &mut V, node: &'ast ConstParam)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.const_token.span);
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&node.ty);
if let Some(it) = &node.eq_token {
tokens_helper(v, &it.spans);
}
if let Some(it) = &node.default {
v.visit_expr(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_constraint<'ast, V>(v: &mut V, node: &'ast Constraint)
where
V: Visit<'ast> + ?Sized,
{
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon_token.spans);
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "derive")]
pub fn visit_data<'ast, V>(v: &mut V, node: &'ast Data)
where
V: Visit<'ast> + ?Sized,
{
match node {
Data::Struct(_binding_0) => {
v.visit_data_struct(_binding_0);
}
Data::Enum(_binding_0) => {
v.visit_data_enum(_binding_0);
}
Data::Union(_binding_0) => {
v.visit_data_union(_binding_0);
}
}
}
#[cfg(feature = "derive")]
pub fn visit_data_enum<'ast, V>(v: &mut V, node: &'ast DataEnum)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.enum_token.span);
tokens_helper(v, &node.brace_token.span);
for el in Punctuated::pairs(&node.variants) {
let (it, p) = el.into_tuple();
v.visit_variant(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "derive")]
pub fn visit_data_struct<'ast, V>(v: &mut V, node: &'ast DataStruct)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.struct_token.span);
v.visit_fields(&node.fields);
if let Some(it) = &node.semi_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "derive")]
pub fn visit_data_union<'ast, V>(v: &mut V, node: &'ast DataUnion)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.union_token.span);
v.visit_fields_named(&node.fields);
}
#[cfg(feature = "derive")]
pub fn visit_derive_input<'ast, V>(v: &mut V, node: &'ast DeriveInput)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
v.visit_data(&node.data);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr<'ast, V>(v: &mut V, node: &'ast Expr)
where
V: Visit<'ast> + ?Sized,
{
match node {
Expr::Array(_binding_0) => {
full!(v.visit_expr_array(_binding_0));
}
Expr::Assign(_binding_0) => {
full!(v.visit_expr_assign(_binding_0));
}
Expr::AssignOp(_binding_0) => {
full!(v.visit_expr_assign_op(_binding_0));
}
Expr::Async(_binding_0) => {
full!(v.visit_expr_async(_binding_0));
}
Expr::Await(_binding_0) => {
full!(v.visit_expr_await(_binding_0));
}
Expr::Binary(_binding_0) => {
v.visit_expr_binary(_binding_0);
}
Expr::Block(_binding_0) => {
full!(v.visit_expr_block(_binding_0));
}
Expr::Box(_binding_0) => {
full!(v.visit_expr_box(_binding_0));
}
Expr::Break(_binding_0) => {
full!(v.visit_expr_break(_binding_0));
}
Expr::Call(_binding_0) => {
v.visit_expr_call(_binding_0);
}
Expr::Cast(_binding_0) => {
v.visit_expr_cast(_binding_0);
}
Expr::Closure(_binding_0) => {
full!(v.visit_expr_closure(_binding_0));
}
Expr::Continue(_binding_0) => {
full!(v.visit_expr_continue(_binding_0));
}
Expr::Field(_binding_0) => {
v.visit_expr_field(_binding_0);
}
Expr::ForLoop(_binding_0) => {
full!(v.visit_expr_for_loop(_binding_0));
}
Expr::Group(_binding_0) => {
full!(v.visit_expr_group(_binding_0));
}
Expr::If(_binding_0) => {
full!(v.visit_expr_if(_binding_0));
}
Expr::Index(_binding_0) => {
v.visit_expr_index(_binding_0);
}
Expr::Let(_binding_0) => {
full!(v.visit_expr_let(_binding_0));
}
Expr::Lit(_binding_0) => {
v.visit_expr_lit(_binding_0);
}
Expr::Loop(_binding_0) => {
full!(v.visit_expr_loop(_binding_0));
}
Expr::Macro(_binding_0) => {
full!(v.visit_expr_macro(_binding_0));
}
Expr::Match(_binding_0) => {
full!(v.visit_expr_match(_binding_0));
}
Expr::MethodCall(_binding_0) => {
full!(v.visit_expr_method_call(_binding_0));
}
Expr::Paren(_binding_0) => {
v.visit_expr_paren(_binding_0);
}
Expr::Path(_binding_0) => {
v.visit_expr_path(_binding_0);
}
Expr::Range(_binding_0) => {
full!(v.visit_expr_range(_binding_0));
}
Expr::Reference(_binding_0) => {
full!(v.visit_expr_reference(_binding_0));
}
Expr::Repeat(_binding_0) => {
full!(v.visit_expr_repeat(_binding_0));
}
Expr::Return(_binding_0) => {
full!(v.visit_expr_return(_binding_0));
}
Expr::Struct(_binding_0) => {
full!(v.visit_expr_struct(_binding_0));
}
Expr::Try(_binding_0) => {
full!(v.visit_expr_try(_binding_0));
}
Expr::TryBlock(_binding_0) => {
full!(v.visit_expr_try_block(_binding_0));
}
Expr::Tuple(_binding_0) => {
full!(v.visit_expr_tuple(_binding_0));
}
Expr::Type(_binding_0) => {
full!(v.visit_expr_type(_binding_0));
}
Expr::Unary(_binding_0) => {
v.visit_expr_unary(_binding_0);
}
Expr::Unsafe(_binding_0) => {
full!(v.visit_expr_unsafe(_binding_0));
}
Expr::Verbatim(_binding_0) => {
skip!(_binding_0);
}
Expr::While(_binding_0) => {
full!(v.visit_expr_while(_binding_0));
}
Expr::Yield(_binding_0) => {
full!(v.visit_expr_yield(_binding_0));
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_expr_array<'ast, V>(v: &mut V, node: &'ast ExprArray)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.bracket_token.span);
for el in Punctuated::pairs(&node.elems) {
let (it, p) = el.into_tuple();
v.visit_expr(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_expr_assign<'ast, V>(v: &mut V, node: &'ast ExprAssign)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.left);
tokens_helper(v, &node.eq_token.spans);
v.visit_expr(&*node.right);
}
#[cfg(feature = "full")]
pub fn visit_expr_assign_op<'ast, V>(v: &mut V, node: &'ast ExprAssignOp)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.left);
v.visit_bin_op(&node.op);
v.visit_expr(&*node.right);
}
#[cfg(feature = "full")]
pub fn visit_expr_async<'ast, V>(v: &mut V, node: &'ast ExprAsync)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.async_token.span);
if let Some(it) = &node.capture {
tokens_helper(v, &it.span);
}
v.visit_block(&node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_await<'ast, V>(v: &mut V, node: &'ast ExprAwait)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.base);
tokens_helper(v, &node.dot_token.spans);
tokens_helper(v, &node.await_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_binary<'ast, V>(v: &mut V, node: &'ast ExprBinary)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.left);
v.visit_bin_op(&node.op);
v.visit_expr(&*node.right);
}
#[cfg(feature = "full")]
pub fn visit_expr_block<'ast, V>(v: &mut V, node: &'ast ExprBlock)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.label {
v.visit_label(it);
}
v.visit_block(&node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_box<'ast, V>(v: &mut V, node: &'ast ExprBox)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.box_token.span);
v.visit_expr(&*node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_break<'ast, V>(v: &mut V, node: &'ast ExprBreak)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.break_token.span);
if let Some(it) = &node.label {
v.visit_lifetime(it);
}
if let Some(it) = &node.expr {
v.visit_expr(&**it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_call<'ast, V>(v: &mut V, node: &'ast ExprCall)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.func);
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.args) {
let (it, p) = el.into_tuple();
v.visit_expr(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_cast<'ast, V>(v: &mut V, node: &'ast ExprCast)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.expr);
tokens_helper(v, &node.as_token.span);
v.visit_type(&*node.ty);
}
#[cfg(feature = "full")]
pub fn visit_expr_closure<'ast, V>(v: &mut V, node: &'ast ExprClosure)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.movability {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.asyncness {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.capture {
tokens_helper(v, &it.span);
}
tokens_helper(v, &node.or1_token.spans);
for el in Punctuated::pairs(&node.inputs) {
let (it, p) = el.into_tuple();
v.visit_pat(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
tokens_helper(v, &node.or2_token.spans);
v.visit_return_type(&node.output);
v.visit_expr(&*node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_continue<'ast, V>(v: &mut V, node: &'ast ExprContinue)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.continue_token.span);
if let Some(it) = &node.label {
v.visit_lifetime(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_field<'ast, V>(v: &mut V, node: &'ast ExprField)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.base);
tokens_helper(v, &node.dot_token.spans);
v.visit_member(&node.member);
}
#[cfg(feature = "full")]
pub fn visit_expr_for_loop<'ast, V>(v: &mut V, node: &'ast ExprForLoop)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.label {
v.visit_label(it);
}
tokens_helper(v, &node.for_token.span);
v.visit_pat(&node.pat);
tokens_helper(v, &node.in_token.span);
v.visit_expr(&*node.expr);
v.visit_block(&node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_group<'ast, V>(v: &mut V, node: &'ast ExprGroup)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.group_token.span);
v.visit_expr(&*node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_if<'ast, V>(v: &mut V, node: &'ast ExprIf)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.if_token.span);
v.visit_expr(&*node.cond);
v.visit_block(&node.then_branch);
if let Some(it) = &node.else_branch {
tokens_helper(v, &(it).0.span);
v.visit_expr(&*(it).1);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_index<'ast, V>(v: &mut V, node: &'ast ExprIndex)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.expr);
tokens_helper(v, &node.bracket_token.span);
v.visit_expr(&*node.index);
}
#[cfg(feature = "full")]
pub fn visit_expr_let<'ast, V>(v: &mut V, node: &'ast ExprLet)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.let_token.span);
v.visit_pat(&node.pat);
tokens_helper(v, &node.eq_token.spans);
v.visit_expr(&*node.expr);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_lit<'ast, V>(v: &mut V, node: &'ast ExprLit)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_lit(&node.lit);
}
#[cfg(feature = "full")]
pub fn visit_expr_loop<'ast, V>(v: &mut V, node: &'ast ExprLoop)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.label {
v.visit_label(it);
}
tokens_helper(v, &node.loop_token.span);
v.visit_block(&node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_macro<'ast, V>(v: &mut V, node: &'ast ExprMacro)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_macro(&node.mac);
}
#[cfg(feature = "full")]
pub fn visit_expr_match<'ast, V>(v: &mut V, node: &'ast ExprMatch)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.match_token.span);
v.visit_expr(&*node.expr);
tokens_helper(v, &node.brace_token.span);
for it in &node.arms {
v.visit_arm(it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_method_call<'ast, V>(v: &mut V, node: &'ast ExprMethodCall)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.receiver);
tokens_helper(v, &node.dot_token.spans);
v.visit_ident(&node.method);
if let Some(it) = &node.turbofish {
v.visit_method_turbofish(it);
}
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.args) {
let (it, p) = el.into_tuple();
v.visit_expr(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_paren<'ast, V>(v: &mut V, node: &'ast ExprParen)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.paren_token.span);
v.visit_expr(&*node.expr);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_path<'ast, V>(v: &mut V, node: &'ast ExprPath)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.qself {
v.visit_qself(it);
}
v.visit_path(&node.path);
}
#[cfg(feature = "full")]
pub fn visit_expr_range<'ast, V>(v: &mut V, node: &'ast ExprRange)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.from {
v.visit_expr(&**it);
}
v.visit_range_limits(&node.limits);
if let Some(it) = &node.to {
v.visit_expr(&**it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_reference<'ast, V>(v: &mut V, node: &'ast ExprReference)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.and_token.spans);
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
v.visit_expr(&*node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_repeat<'ast, V>(v: &mut V, node: &'ast ExprRepeat)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.bracket_token.span);
v.visit_expr(&*node.expr);
tokens_helper(v, &node.semi_token.spans);
v.visit_expr(&*node.len);
}
#[cfg(feature = "full")]
pub fn visit_expr_return<'ast, V>(v: &mut V, node: &'ast ExprReturn)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.return_token.span);
if let Some(it) = &node.expr {
v.visit_expr(&**it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_struct<'ast, V>(v: &mut V, node: &'ast ExprStruct)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_path(&node.path);
tokens_helper(v, &node.brace_token.span);
for el in Punctuated::pairs(&node.fields) {
let (it, p) = el.into_tuple();
v.visit_field_value(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
if let Some(it) = &node.dot2_token {
tokens_helper(v, &it.spans);
}
if let Some(it) = &node.rest {
v.visit_expr(&**it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_try<'ast, V>(v: &mut V, node: &'ast ExprTry)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.expr);
tokens_helper(v, &node.question_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_expr_try_block<'ast, V>(v: &mut V, node: &'ast ExprTryBlock)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.try_token.span);
v.visit_block(&node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_tuple<'ast, V>(v: &mut V, node: &'ast ExprTuple)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.elems) {
let (it, p) = el.into_tuple();
v.visit_expr(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_expr_type<'ast, V>(v: &mut V, node: &'ast ExprType)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.expr);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&*node.ty);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_unary<'ast, V>(v: &mut V, node: &'ast ExprUnary)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_un_op(&node.op);
v.visit_expr(&*node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_unsafe<'ast, V>(v: &mut V, node: &'ast ExprUnsafe)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.unsafe_token.span);
v.visit_block(&node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_while<'ast, V>(v: &mut V, node: &'ast ExprWhile)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.label {
v.visit_label(it);
}
tokens_helper(v, &node.while_token.span);
v.visit_expr(&*node.cond);
v.visit_block(&node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_yield<'ast, V>(v: &mut V, node: &'ast ExprYield)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.yield_token.span);
if let Some(it) = &node.expr {
v.visit_expr(&**it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_field<'ast, V>(v: &mut V, node: &'ast Field)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
if let Some(it) = &node.ident {
v.visit_ident(it);
}
if let Some(it) = &node.colon_token {
tokens_helper(v, &it.spans);
}
v.visit_type(&node.ty);
}
#[cfg(feature = "full")]
pub fn visit_field_pat<'ast, V>(v: &mut V, node: &'ast FieldPat)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_member(&node.member);
if let Some(it) = &node.colon_token {
tokens_helper(v, &it.spans);
}
v.visit_pat(&*node.pat);
}
#[cfg(feature = "full")]
pub fn visit_field_value<'ast, V>(v: &mut V, node: &'ast FieldValue)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_member(&node.member);
if let Some(it) = &node.colon_token {
tokens_helper(v, &it.spans);
}
v.visit_expr(&node.expr);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_fields<'ast, V>(v: &mut V, node: &'ast Fields)
where
V: Visit<'ast> + ?Sized,
{
match node {
Fields::Named(_binding_0) => {
v.visit_fields_named(_binding_0);
}
Fields::Unnamed(_binding_0) => {
v.visit_fields_unnamed(_binding_0);
}
Fields::Unit => {}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_fields_named<'ast, V>(v: &mut V, node: &'ast FieldsNamed)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.brace_token.span);
for el in Punctuated::pairs(&node.named) {
let (it, p) = el.into_tuple();
v.visit_field(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_fields_unnamed<'ast, V>(v: &mut V, node: &'ast FieldsUnnamed)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.unnamed) {
let (it, p) = el.into_tuple();
v.visit_field(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_file<'ast, V>(v: &mut V, node: &'ast File)
where
V: Visit<'ast> + ?Sized,
{
skip!(node.shebang);
for it in &node.attrs {
v.visit_attribute(it);
}
for it in &node.items {
v.visit_item(it);
}
}
#[cfg(feature = "full")]
pub fn visit_fn_arg<'ast, V>(v: &mut V, node: &'ast FnArg)
where
V: Visit<'ast> + ?Sized,
{
match node {
FnArg::Receiver(_binding_0) => {
v.visit_receiver(_binding_0);
}
FnArg::Typed(_binding_0) => {
v.visit_pat_type(_binding_0);
}
}
}
#[cfg(feature = "full")]
pub fn visit_foreign_item<'ast, V>(v: &mut V, node: &'ast ForeignItem)
where
V: Visit<'ast> + ?Sized,
{
match node {
ForeignItem::Fn(_binding_0) => {
v.visit_foreign_item_fn(_binding_0);
}
ForeignItem::Static(_binding_0) => {
v.visit_foreign_item_static(_binding_0);
}
ForeignItem::Type(_binding_0) => {
v.visit_foreign_item_type(_binding_0);
}
ForeignItem::Macro(_binding_0) => {
v.visit_foreign_item_macro(_binding_0);
}
ForeignItem::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_fn<'ast, V>(v: &mut V, node: &'ast ForeignItemFn)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
v.visit_signature(&node.sig);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_macro<'ast, V>(v: &mut V, node: &'ast ForeignItemMacro)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_macro(&node.mac);
if let Some(it) = &node.semi_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_static<'ast, V>(v: &mut V, node: &'ast ForeignItemStatic)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.static_token.span);
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&*node.ty);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_type<'ast, V>(v: &mut V, node: &'ast ForeignItemType)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.type_token.span);
v.visit_ident(&node.ident);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_generic_argument<'ast, V>(v: &mut V, node: &'ast GenericArgument)
where
V: Visit<'ast> + ?Sized,
{
match node {
GenericArgument::Lifetime(_binding_0) => {
v.visit_lifetime(_binding_0);
}
GenericArgument::Type(_binding_0) => {
v.visit_type(_binding_0);
}
GenericArgument::Const(_binding_0) => {
v.visit_expr(_binding_0);
}
GenericArgument::Binding(_binding_0) => {
v.visit_binding(_binding_0);
}
GenericArgument::Constraint(_binding_0) => {
v.visit_constraint(_binding_0);
}
}
}
#[cfg(feature = "full")]
pub fn visit_generic_method_argument<'ast, V>(
v: &mut V,
node: &'ast GenericMethodArgument,
)
where
V: Visit<'ast> + ?Sized,
{
match node {
GenericMethodArgument::Type(_binding_0) => {
v.visit_type(_binding_0);
}
GenericMethodArgument::Const(_binding_0) => {
v.visit_expr(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_generic_param<'ast, V>(v: &mut V, node: &'ast GenericParam)
where
V: Visit<'ast> + ?Sized,
{
match node {
GenericParam::Type(_binding_0) => {
v.visit_type_param(_binding_0);
}
GenericParam::Lifetime(_binding_0) => {
v.visit_lifetime_def(_binding_0);
}
GenericParam::Const(_binding_0) => {
v.visit_const_param(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_generics<'ast, V>(v: &mut V, node: &'ast Generics)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.lt_token {
tokens_helper(v, &it.spans);
}
for el in Punctuated::pairs(&node.params) {
let (it, p) = el.into_tuple();
v.visit_generic_param(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
if let Some(it) = &node.gt_token {
tokens_helper(v, &it.spans);
}
if let Some(it) = &node.where_clause {
v.visit_where_clause(it);
}
}
pub fn visit_ident<'ast, V>(v: &mut V, node: &'ast Ident)
where
V: Visit<'ast> + ?Sized,
{
v.visit_span(&node.span());
}
#[cfg(feature = "full")]
pub fn visit_impl_item<'ast, V>(v: &mut V, node: &'ast ImplItem)
where
V: Visit<'ast> + ?Sized,
{
match node {
ImplItem::Const(_binding_0) => {
v.visit_impl_item_const(_binding_0);
}
ImplItem::Method(_binding_0) => {
v.visit_impl_item_method(_binding_0);
}
ImplItem::Type(_binding_0) => {
v.visit_impl_item_type(_binding_0);
}
ImplItem::Macro(_binding_0) => {
v.visit_impl_item_macro(_binding_0);
}
ImplItem::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_impl_item_const<'ast, V>(v: &mut V, node: &'ast ImplItemConst)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
if let Some(it) = &node.defaultness {
tokens_helper(v, &it.span);
}
tokens_helper(v, &node.const_token.span);
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&node.ty);
tokens_helper(v, &node.eq_token.spans);
v.visit_expr(&node.expr);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_impl_item_macro<'ast, V>(v: &mut V, node: &'ast ImplItemMacro)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_macro(&node.mac);
if let Some(it) = &node.semi_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_impl_item_method<'ast, V>(v: &mut V, node: &'ast ImplItemMethod)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
if let Some(it) = &node.defaultness {
tokens_helper(v, &it.span);
}
v.visit_signature(&node.sig);
v.visit_block(&node.block);
}
#[cfg(feature = "full")]
pub fn visit_impl_item_type<'ast, V>(v: &mut V, node: &'ast ImplItemType)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
if let Some(it) = &node.defaultness {
tokens_helper(v, &it.span);
}
tokens_helper(v, &node.type_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
tokens_helper(v, &node.eq_token.spans);
v.visit_type(&node.ty);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_index<'ast, V>(v: &mut V, node: &'ast Index)
where
V: Visit<'ast> + ?Sized,
{
skip!(node.index);
v.visit_span(&node.span);
}
#[cfg(feature = "full")]
pub fn visit_item<'ast, V>(v: &mut V, node: &'ast Item)
where
V: Visit<'ast> + ?Sized,
{
match node {
Item::Const(_binding_0) => {
v.visit_item_const(_binding_0);
}
Item::Enum(_binding_0) => {
v.visit_item_enum(_binding_0);
}
Item::ExternCrate(_binding_0) => {
v.visit_item_extern_crate(_binding_0);
}
Item::Fn(_binding_0) => {
v.visit_item_fn(_binding_0);
}
Item::ForeignMod(_binding_0) => {
v.visit_item_foreign_mod(_binding_0);
}
Item::Impl(_binding_0) => {
v.visit_item_impl(_binding_0);
}
Item::Macro(_binding_0) => {
v.visit_item_macro(_binding_0);
}
Item::Macro2(_binding_0) => {
v.visit_item_macro2(_binding_0);
}
Item::Mod(_binding_0) => {
v.visit_item_mod(_binding_0);
}
Item::Static(_binding_0) => {
v.visit_item_static(_binding_0);
}
Item::Struct(_binding_0) => {
v.visit_item_struct(_binding_0);
}
Item::Trait(_binding_0) => {
v.visit_item_trait(_binding_0);
}
Item::TraitAlias(_binding_0) => {
v.visit_item_trait_alias(_binding_0);
}
Item::Type(_binding_0) => {
v.visit_item_type(_binding_0);
}
Item::Union(_binding_0) => {
v.visit_item_union(_binding_0);
}
Item::Use(_binding_0) => {
v.visit_item_use(_binding_0);
}
Item::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_item_const<'ast, V>(v: &mut V, node: &'ast ItemConst)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.const_token.span);
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&*node.ty);
tokens_helper(v, &node.eq_token.spans);
v.visit_expr(&*node.expr);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_enum<'ast, V>(v: &mut V, node: &'ast ItemEnum)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.enum_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
tokens_helper(v, &node.brace_token.span);
for el in Punctuated::pairs(&node.variants) {
let (it, p) = el.into_tuple();
v.visit_variant(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_item_extern_crate<'ast, V>(v: &mut V, node: &'ast ItemExternCrate)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.extern_token.span);
tokens_helper(v, &node.crate_token.span);
v.visit_ident(&node.ident);
if let Some(it) = &node.rename {
tokens_helper(v, &(it).0.span);
v.visit_ident(&(it).1);
}
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_fn<'ast, V>(v: &mut V, node: &'ast ItemFn)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
v.visit_signature(&node.sig);
v.visit_block(&*node.block);
}
#[cfg(feature = "full")]
pub fn visit_item_foreign_mod<'ast, V>(v: &mut V, node: &'ast ItemForeignMod)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_abi(&node.abi);
tokens_helper(v, &node.brace_token.span);
for it in &node.items {
v.visit_foreign_item(it);
}
}
#[cfg(feature = "full")]
pub fn visit_item_impl<'ast, V>(v: &mut V, node: &'ast ItemImpl)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.defaultness {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.unsafety {
tokens_helper(v, &it.span);
}
tokens_helper(v, &node.impl_token.span);
v.visit_generics(&node.generics);
if let Some(it) = &node.trait_ {
if let Some(it) = &(it).0 {
tokens_helper(v, &it.spans);
}
v.visit_path(&(it).1);
tokens_helper(v, &(it).2.span);
}
v.visit_type(&*node.self_ty);
tokens_helper(v, &node.brace_token.span);
for it in &node.items {
v.visit_impl_item(it);
}
}
#[cfg(feature = "full")]
pub fn visit_item_macro<'ast, V>(v: &mut V, node: &'ast ItemMacro)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.ident {
v.visit_ident(it);
}
v.visit_macro(&node.mac);
if let Some(it) = &node.semi_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_item_macro2<'ast, V>(v: &mut V, node: &'ast ItemMacro2)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.macro_token.span);
v.visit_ident(&node.ident);
skip!(node.rules);
}
#[cfg(feature = "full")]
pub fn visit_item_mod<'ast, V>(v: &mut V, node: &'ast ItemMod)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.mod_token.span);
v.visit_ident(&node.ident);
if let Some(it) = &node.content {
tokens_helper(v, &(it).0.span);
for it in &(it).1 {
v.visit_item(it);
}
}
if let Some(it) = &node.semi {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_item_static<'ast, V>(v: &mut V, node: &'ast ItemStatic)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.static_token.span);
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&*node.ty);
tokens_helper(v, &node.eq_token.spans);
v.visit_expr(&*node.expr);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_struct<'ast, V>(v: &mut V, node: &'ast ItemStruct)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.struct_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
v.visit_fields(&node.fields);
if let Some(it) = &node.semi_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_item_trait<'ast, V>(v: &mut V, node: &'ast ItemTrait)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
if let Some(it) = &node.unsafety {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.auto_token {
tokens_helper(v, &it.span);
}
tokens_helper(v, &node.trait_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
if let Some(it) = &node.colon_token {
tokens_helper(v, &it.spans);
}
for el in Punctuated::pairs(&node.supertraits) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
tokens_helper(v, &node.brace_token.span);
for it in &node.items {
v.visit_trait_item(it);
}
}
#[cfg(feature = "full")]
pub fn visit_item_trait_alias<'ast, V>(v: &mut V, node: &'ast ItemTraitAlias)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.trait_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
tokens_helper(v, &node.eq_token.spans);
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_type<'ast, V>(v: &mut V, node: &'ast ItemType)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.type_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
tokens_helper(v, &node.eq_token.spans);
v.visit_type(&*node.ty);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_union<'ast, V>(v: &mut V, node: &'ast ItemUnion)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.union_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
v.visit_fields_named(&node.fields);
}
#[cfg(feature = "full")]
pub fn visit_item_use<'ast, V>(v: &mut V, node: &'ast ItemUse)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_visibility(&node.vis);
tokens_helper(v, &node.use_token.span);
if let Some(it) = &node.leading_colon {
tokens_helper(v, &it.spans);
}
v.visit_use_tree(&node.tree);
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_label<'ast, V>(v: &mut V, node: &'ast Label)
where
V: Visit<'ast> + ?Sized,
{
v.visit_lifetime(&node.name);
tokens_helper(v, &node.colon_token.spans);
}
pub fn visit_lifetime<'ast, V>(v: &mut V, node: &'ast Lifetime)
where
V: Visit<'ast> + ?Sized,
{
v.visit_span(&node.apostrophe);
v.visit_ident(&node.ident);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_lifetime_def<'ast, V>(v: &mut V, node: &'ast LifetimeDef)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_lifetime(&node.lifetime);
if let Some(it) = &node.colon_token {
tokens_helper(v, &it.spans);
}
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_lifetime(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
pub fn visit_lit<'ast, V>(v: &mut V, node: &'ast Lit)
where
V: Visit<'ast> + ?Sized,
{
match node {
Lit::Str(_binding_0) => {
v.visit_lit_str(_binding_0);
}
Lit::ByteStr(_binding_0) => {
v.visit_lit_byte_str(_binding_0);
}
Lit::Byte(_binding_0) => {
v.visit_lit_byte(_binding_0);
}
Lit::Char(_binding_0) => {
v.visit_lit_char(_binding_0);
}
Lit::Int(_binding_0) => {
v.visit_lit_int(_binding_0);
}
Lit::Float(_binding_0) => {
v.visit_lit_float(_binding_0);
}
Lit::Bool(_binding_0) => {
v.visit_lit_bool(_binding_0);
}
Lit::Verbatim(_binding_0) => {
skip!(_binding_0);
}
}
}
pub fn visit_lit_bool<'ast, V>(v: &mut V, node: &'ast LitBool)
where
V: Visit<'ast> + ?Sized,
{
skip!(node.value);
v.visit_span(&node.span);
}
pub fn visit_lit_byte<'ast, V>(v: &mut V, node: &'ast LitByte)
where
V: Visit<'ast> + ?Sized,
{}
pub fn visit_lit_byte_str<'ast, V>(v: &mut V, node: &'ast LitByteStr)
where
V: Visit<'ast> + ?Sized,
{}
pub fn visit_lit_char<'ast, V>(v: &mut V, node: &'ast LitChar)
where
V: Visit<'ast> + ?Sized,
{}
pub fn visit_lit_float<'ast, V>(v: &mut V, node: &'ast LitFloat)
where
V: Visit<'ast> + ?Sized,
{}
pub fn visit_lit_int<'ast, V>(v: &mut V, node: &'ast LitInt)
where
V: Visit<'ast> + ?Sized,
{}
pub fn visit_lit_str<'ast, V>(v: &mut V, node: &'ast LitStr)
where
V: Visit<'ast> + ?Sized,
{}
#[cfg(feature = "full")]
pub fn visit_local<'ast, V>(v: &mut V, node: &'ast Local)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.let_token.span);
v.visit_pat(&node.pat);
if let Some(it) = &node.init {
tokens_helper(v, &(it).0.spans);
v.visit_expr(&*(it).1);
}
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_macro<'ast, V>(v: &mut V, node: &'ast Macro)
where
V: Visit<'ast> + ?Sized,
{
v.visit_path(&node.path);
tokens_helper(v, &node.bang_token.spans);
v.visit_macro_delimiter(&node.delimiter);
skip!(node.tokens);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_macro_delimiter<'ast, V>(v: &mut V, node: &'ast MacroDelimiter)
where
V: Visit<'ast> + ?Sized,
{
match node {
MacroDelimiter::Paren(_binding_0) => {
tokens_helper(v, &_binding_0.span);
}
MacroDelimiter::Brace(_binding_0) => {
tokens_helper(v, &_binding_0.span);
}
MacroDelimiter::Bracket(_binding_0) => {
tokens_helper(v, &_binding_0.span);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_member<'ast, V>(v: &mut V, node: &'ast Member)
where
V: Visit<'ast> + ?Sized,
{
match node {
Member::Named(_binding_0) => {
v.visit_ident(_binding_0);
}
Member::Unnamed(_binding_0) => {
v.visit_index(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_meta<'ast, V>(v: &mut V, node: &'ast Meta)
where
V: Visit<'ast> + ?Sized,
{
match node {
Meta::Path(_binding_0) => {
v.visit_path(_binding_0);
}
Meta::List(_binding_0) => {
v.visit_meta_list(_binding_0);
}
Meta::NameValue(_binding_0) => {
v.visit_meta_name_value(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_meta_list<'ast, V>(v: &mut V, node: &'ast MetaList)
where
V: Visit<'ast> + ?Sized,
{
v.visit_path(&node.path);
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.nested) {
let (it, p) = el.into_tuple();
v.visit_nested_meta(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_meta_name_value<'ast, V>(v: &mut V, node: &'ast MetaNameValue)
where
V: Visit<'ast> + ?Sized,
{
v.visit_path(&node.path);
tokens_helper(v, &node.eq_token.spans);
v.visit_lit(&node.lit);
}
#[cfg(feature = "full")]
pub fn visit_method_turbofish<'ast, V>(v: &mut V, node: &'ast MethodTurbofish)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.colon2_token.spans);
tokens_helper(v, &node.lt_token.spans);
for el in Punctuated::pairs(&node.args) {
let (it, p) = el.into_tuple();
v.visit_generic_method_argument(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
tokens_helper(v, &node.gt_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_nested_meta<'ast, V>(v: &mut V, node: &'ast NestedMeta)
where
V: Visit<'ast> + ?Sized,
{
match node {
NestedMeta::Meta(_binding_0) => {
v.visit_meta(_binding_0);
}
NestedMeta::Lit(_binding_0) => {
v.visit_lit(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_parenthesized_generic_arguments<'ast, V>(
v: &mut V,
node: &'ast ParenthesizedGenericArguments,
)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.inputs) {
let (it, p) = el.into_tuple();
v.visit_type(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
v.visit_return_type(&node.output);
}
#[cfg(feature = "full")]
pub fn visit_pat<'ast, V>(v: &mut V, node: &'ast Pat)
where
V: Visit<'ast> + ?Sized,
{
match node {
Pat::Box(_binding_0) => {
v.visit_pat_box(_binding_0);
}
Pat::Ident(_binding_0) => {
v.visit_pat_ident(_binding_0);
}
Pat::Lit(_binding_0) => {
v.visit_pat_lit(_binding_0);
}
Pat::Macro(_binding_0) => {
v.visit_pat_macro(_binding_0);
}
Pat::Or(_binding_0) => {
v.visit_pat_or(_binding_0);
}
Pat::Path(_binding_0) => {
v.visit_pat_path(_binding_0);
}
Pat::Range(_binding_0) => {
v.visit_pat_range(_binding_0);
}
Pat::Reference(_binding_0) => {
v.visit_pat_reference(_binding_0);
}
Pat::Rest(_binding_0) => {
v.visit_pat_rest(_binding_0);
}
Pat::Slice(_binding_0) => {
v.visit_pat_slice(_binding_0);
}
Pat::Struct(_binding_0) => {
v.visit_pat_struct(_binding_0);
}
Pat::Tuple(_binding_0) => {
v.visit_pat_tuple(_binding_0);
}
Pat::TupleStruct(_binding_0) => {
v.visit_pat_tuple_struct(_binding_0);
}
Pat::Type(_binding_0) => {
v.visit_pat_type(_binding_0);
}
Pat::Verbatim(_binding_0) => {
skip!(_binding_0);
}
Pat::Wild(_binding_0) => {
v.visit_pat_wild(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_pat_box<'ast, V>(v: &mut V, node: &'ast PatBox)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.box_token.span);
v.visit_pat(&*node.pat);
}
#[cfg(feature = "full")]
pub fn visit_pat_ident<'ast, V>(v: &mut V, node: &'ast PatIdent)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.by_ref {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
v.visit_ident(&node.ident);
if let Some(it) = &node.subpat {
tokens_helper(v, &(it).0.spans);
v.visit_pat(&*(it).1);
}
}
#[cfg(feature = "full")]
pub fn visit_pat_lit<'ast, V>(v: &mut V, node: &'ast PatLit)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.expr);
}
#[cfg(feature = "full")]
pub fn visit_pat_macro<'ast, V>(v: &mut V, node: &'ast PatMacro)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_macro(&node.mac);
}
#[cfg(feature = "full")]
pub fn visit_pat_or<'ast, V>(v: &mut V, node: &'ast PatOr)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.leading_vert {
tokens_helper(v, &it.spans);
}
for el in Punctuated::pairs(&node.cases) {
let (it, p) = el.into_tuple();
v.visit_pat(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_pat_path<'ast, V>(v: &mut V, node: &'ast PatPath)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.qself {
v.visit_qself(it);
}
v.visit_path(&node.path);
}
#[cfg(feature = "full")]
pub fn visit_pat_range<'ast, V>(v: &mut V, node: &'ast PatRange)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_expr(&*node.lo);
v.visit_range_limits(&node.limits);
v.visit_expr(&*node.hi);
}
#[cfg(feature = "full")]
pub fn visit_pat_reference<'ast, V>(v: &mut V, node: &'ast PatReference)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.and_token.spans);
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
v.visit_pat(&*node.pat);
}
#[cfg(feature = "full")]
pub fn visit_pat_rest<'ast, V>(v: &mut V, node: &'ast PatRest)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.dot2_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_pat_slice<'ast, V>(v: &mut V, node: &'ast PatSlice)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.bracket_token.span);
for el in Punctuated::pairs(&node.elems) {
let (it, p) = el.into_tuple();
v.visit_pat(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_pat_struct<'ast, V>(v: &mut V, node: &'ast PatStruct)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_path(&node.path);
tokens_helper(v, &node.brace_token.span);
for el in Punctuated::pairs(&node.fields) {
let (it, p) = el.into_tuple();
v.visit_field_pat(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
if let Some(it) = &node.dot2_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_pat_tuple<'ast, V>(v: &mut V, node: &'ast PatTuple)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.elems) {
let (it, p) = el.into_tuple();
v.visit_pat(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_pat_tuple_struct<'ast, V>(v: &mut V, node: &'ast PatTupleStruct)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_path(&node.path);
v.visit_pat_tuple(&node.pat);
}
#[cfg(feature = "full")]
pub fn visit_pat_type<'ast, V>(v: &mut V, node: &'ast PatType)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_pat(&*node.pat);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&*node.ty);
}
#[cfg(feature = "full")]
pub fn visit_pat_wild<'ast, V>(v: &mut V, node: &'ast PatWild)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.underscore_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_path<'ast, V>(v: &mut V, node: &'ast Path)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.leading_colon {
tokens_helper(v, &it.spans);
}
for el in Punctuated::pairs(&node.segments) {
let (it, p) = el.into_tuple();
v.visit_path_segment(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_path_arguments<'ast, V>(v: &mut V, node: &'ast PathArguments)
where
V: Visit<'ast> + ?Sized,
{
match node {
PathArguments::None => {}
PathArguments::AngleBracketed(_binding_0) => {
v.visit_angle_bracketed_generic_arguments(_binding_0);
}
PathArguments::Parenthesized(_binding_0) => {
v.visit_parenthesized_generic_arguments(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_path_segment<'ast, V>(v: &mut V, node: &'ast PathSegment)
where
V: Visit<'ast> + ?Sized,
{
v.visit_ident(&node.ident);
v.visit_path_arguments(&node.arguments);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_predicate_eq<'ast, V>(v: &mut V, node: &'ast PredicateEq)
where
V: Visit<'ast> + ?Sized,
{
v.visit_type(&node.lhs_ty);
tokens_helper(v, &node.eq_token.spans);
v.visit_type(&node.rhs_ty);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_predicate_lifetime<'ast, V>(v: &mut V, node: &'ast PredicateLifetime)
where
V: Visit<'ast> + ?Sized,
{
v.visit_lifetime(&node.lifetime);
tokens_helper(v, &node.colon_token.spans);
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_lifetime(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_predicate_type<'ast, V>(v: &mut V, node: &'ast PredicateType)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.lifetimes {
v.visit_bound_lifetimes(it);
}
v.visit_type(&node.bounded_ty);
tokens_helper(v, &node.colon_token.spans);
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_qself<'ast, V>(v: &mut V, node: &'ast QSelf)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.lt_token.spans);
v.visit_type(&*node.ty);
skip!(node.position);
if let Some(it) = &node.as_token {
tokens_helper(v, &it.span);
}
tokens_helper(v, &node.gt_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_range_limits<'ast, V>(v: &mut V, node: &'ast RangeLimits)
where
V: Visit<'ast> + ?Sized,
{
match node {
RangeLimits::HalfOpen(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
RangeLimits::Closed(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_receiver<'ast, V>(v: &mut V, node: &'ast Receiver)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
if let Some(it) = &node.reference {
tokens_helper(v, &(it).0.spans);
if let Some(it) = &(it).1 {
v.visit_lifetime(it);
}
}
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
tokens_helper(v, &node.self_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_return_type<'ast, V>(v: &mut V, node: &'ast ReturnType)
where
V: Visit<'ast> + ?Sized,
{
match node {
ReturnType::Default => {}
ReturnType::Type(_binding_0, _binding_1) => {
tokens_helper(v, &_binding_0.spans);
v.visit_type(&**_binding_1);
}
}
}
#[cfg(feature = "full")]
pub fn visit_signature<'ast, V>(v: &mut V, node: &'ast Signature)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.constness {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.asyncness {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.unsafety {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.abi {
v.visit_abi(it);
}
tokens_helper(v, &node.fn_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.inputs) {
let (it, p) = el.into_tuple();
v.visit_fn_arg(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
if let Some(it) = &node.variadic {
v.visit_variadic(it);
}
v.visit_return_type(&node.output);
}
pub fn visit_span<'ast, V>(v: &mut V, node: &Span)
where
V: Visit<'ast> + ?Sized,
{}
#[cfg(feature = "full")]
pub fn visit_stmt<'ast, V>(v: &mut V, node: &'ast Stmt)
where
V: Visit<'ast> + ?Sized,
{
match node {
Stmt::Local(_binding_0) => {
v.visit_local(_binding_0);
}
Stmt::Item(_binding_0) => {
v.visit_item(_binding_0);
}
Stmt::Expr(_binding_0) => {
v.visit_expr(_binding_0);
}
Stmt::Semi(_binding_0, _binding_1) => {
v.visit_expr(_binding_0);
tokens_helper(v, &_binding_1.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_trait_bound<'ast, V>(v: &mut V, node: &'ast TraitBound)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.paren_token {
tokens_helper(v, &it.span);
}
v.visit_trait_bound_modifier(&node.modifier);
if let Some(it) = &node.lifetimes {
v.visit_bound_lifetimes(it);
}
v.visit_path(&node.path);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_trait_bound_modifier<'ast, V>(v: &mut V, node: &'ast TraitBoundModifier)
where
V: Visit<'ast> + ?Sized,
{
match node {
TraitBoundModifier::None => {}
TraitBoundModifier::Maybe(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item<'ast, V>(v: &mut V, node: &'ast TraitItem)
where
V: Visit<'ast> + ?Sized,
{
match node {
TraitItem::Const(_binding_0) => {
v.visit_trait_item_const(_binding_0);
}
TraitItem::Method(_binding_0) => {
v.visit_trait_item_method(_binding_0);
}
TraitItem::Type(_binding_0) => {
v.visit_trait_item_type(_binding_0);
}
TraitItem::Macro(_binding_0) => {
v.visit_trait_item_macro(_binding_0);
}
TraitItem::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item_const<'ast, V>(v: &mut V, node: &'ast TraitItemConst)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.const_token.span);
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon_token.spans);
v.visit_type(&node.ty);
if let Some(it) = &node.default {
tokens_helper(v, &(it).0.spans);
v.visit_expr(&(it).1);
}
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_trait_item_macro<'ast, V>(v: &mut V, node: &'ast TraitItemMacro)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_macro(&node.mac);
if let Some(it) = &node.semi_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item_method<'ast, V>(v: &mut V, node: &'ast TraitItemMethod)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_signature(&node.sig);
if let Some(it) = &node.default {
v.visit_block(it);
}
if let Some(it) = &node.semi_token {
tokens_helper(v, &it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item_type<'ast, V>(v: &mut V, node: &'ast TraitItemType)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.type_token.span);
v.visit_ident(&node.ident);
v.visit_generics(&node.generics);
if let Some(it) = &node.colon_token {
tokens_helper(v, &it.spans);
}
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
if let Some(it) = &node.default {
tokens_helper(v, &(it).0.spans);
v.visit_type(&(it).1);
}
tokens_helper(v, &node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type<'ast, V>(v: &mut V, node: &'ast Type)
where
V: Visit<'ast> + ?Sized,
{
match node {
Type::Array(_binding_0) => {
v.visit_type_array(_binding_0);
}
Type::BareFn(_binding_0) => {
v.visit_type_bare_fn(_binding_0);
}
Type::Group(_binding_0) => {
v.visit_type_group(_binding_0);
}
Type::ImplTrait(_binding_0) => {
v.visit_type_impl_trait(_binding_0);
}
Type::Infer(_binding_0) => {
v.visit_type_infer(_binding_0);
}
Type::Macro(_binding_0) => {
v.visit_type_macro(_binding_0);
}
Type::Never(_binding_0) => {
v.visit_type_never(_binding_0);
}
Type::Paren(_binding_0) => {
v.visit_type_paren(_binding_0);
}
Type::Path(_binding_0) => {
v.visit_type_path(_binding_0);
}
Type::Ptr(_binding_0) => {
v.visit_type_ptr(_binding_0);
}
Type::Reference(_binding_0) => {
v.visit_type_reference(_binding_0);
}
Type::Slice(_binding_0) => {
v.visit_type_slice(_binding_0);
}
Type::TraitObject(_binding_0) => {
v.visit_type_trait_object(_binding_0);
}
Type::Tuple(_binding_0) => {
v.visit_type_tuple(_binding_0);
}
Type::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_array<'ast, V>(v: &mut V, node: &'ast TypeArray)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.bracket_token.span);
v.visit_type(&*node.elem);
tokens_helper(v, &node.semi_token.spans);
v.visit_expr(&node.len);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_bare_fn<'ast, V>(v: &mut V, node: &'ast TypeBareFn)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.lifetimes {
v.visit_bound_lifetimes(it);
}
if let Some(it) = &node.unsafety {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.abi {
v.visit_abi(it);
}
tokens_helper(v, &node.fn_token.span);
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.inputs) {
let (it, p) = el.into_tuple();
v.visit_bare_fn_arg(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
if let Some(it) = &node.variadic {
v.visit_variadic(it);
}
v.visit_return_type(&node.output);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_group<'ast, V>(v: &mut V, node: &'ast TypeGroup)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.group_token.span);
v.visit_type(&*node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_impl_trait<'ast, V>(v: &mut V, node: &'ast TypeImplTrait)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.impl_token.span);
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_infer<'ast, V>(v: &mut V, node: &'ast TypeInfer)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.underscore_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_macro<'ast, V>(v: &mut V, node: &'ast TypeMacro)
where
V: Visit<'ast> + ?Sized,
{
v.visit_macro(&node.mac);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_never<'ast, V>(v: &mut V, node: &'ast TypeNever)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.bang_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_param<'ast, V>(v: &mut V, node: &'ast TypeParam)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_ident(&node.ident);
if let Some(it) = &node.colon_token {
tokens_helper(v, &it.spans);
}
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
if let Some(it) = &node.eq_token {
tokens_helper(v, &it.spans);
}
if let Some(it) = &node.default {
v.visit_type(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_param_bound<'ast, V>(v: &mut V, node: &'ast TypeParamBound)
where
V: Visit<'ast> + ?Sized,
{
match node {
TypeParamBound::Trait(_binding_0) => {
v.visit_trait_bound(_binding_0);
}
TypeParamBound::Lifetime(_binding_0) => {
v.visit_lifetime(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_paren<'ast, V>(v: &mut V, node: &'ast TypeParen)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.paren_token.span);
v.visit_type(&*node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_path<'ast, V>(v: &mut V, node: &'ast TypePath)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.qself {
v.visit_qself(it);
}
v.visit_path(&node.path);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_ptr<'ast, V>(v: &mut V, node: &'ast TypePtr)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.star_token.spans);
if let Some(it) = &node.const_token {
tokens_helper(v, &it.span);
}
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
v.visit_type(&*node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_reference<'ast, V>(v: &mut V, node: &'ast TypeReference)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.and_token.spans);
if let Some(it) = &node.lifetime {
v.visit_lifetime(it);
}
if let Some(it) = &node.mutability {
tokens_helper(v, &it.span);
}
v.visit_type(&*node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_slice<'ast, V>(v: &mut V, node: &'ast TypeSlice)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.bracket_token.span);
v.visit_type(&*node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_trait_object<'ast, V>(v: &mut V, node: &'ast TypeTraitObject)
where
V: Visit<'ast> + ?Sized,
{
if let Some(it) = &node.dyn_token {
tokens_helper(v, &it.span);
}
for el in Punctuated::pairs(&node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_tuple<'ast, V>(v: &mut V, node: &'ast TypeTuple)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.paren_token.span);
for el in Punctuated::pairs(&node.elems) {
let (it, p) = el.into_tuple();
v.visit_type(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_un_op<'ast, V>(v: &mut V, node: &'ast UnOp)
where
V: Visit<'ast> + ?Sized,
{
match node {
UnOp::Deref(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
UnOp::Not(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
UnOp::Neg(_binding_0) => {
tokens_helper(v, &_binding_0.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_use_glob<'ast, V>(v: &mut V, node: &'ast UseGlob)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.star_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_use_group<'ast, V>(v: &mut V, node: &'ast UseGroup)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.brace_token.span);
for el in Punctuated::pairs(&node.items) {
let (it, p) = el.into_tuple();
v.visit_use_tree(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_use_name<'ast, V>(v: &mut V, node: &'ast UseName)
where
V: Visit<'ast> + ?Sized,
{
v.visit_ident(&node.ident);
}
#[cfg(feature = "full")]
pub fn visit_use_path<'ast, V>(v: &mut V, node: &'ast UsePath)
where
V: Visit<'ast> + ?Sized,
{
v.visit_ident(&node.ident);
tokens_helper(v, &node.colon2_token.spans);
v.visit_use_tree(&*node.tree);
}
#[cfg(feature = "full")]
pub fn visit_use_rename<'ast, V>(v: &mut V, node: &'ast UseRename)
where
V: Visit<'ast> + ?Sized,
{
v.visit_ident(&node.ident);
tokens_helper(v, &node.as_token.span);
v.visit_ident(&node.rename);
}
#[cfg(feature = "full")]
pub fn visit_use_tree<'ast, V>(v: &mut V, node: &'ast UseTree)
where
V: Visit<'ast> + ?Sized,
{
match node {
UseTree::Path(_binding_0) => {
v.visit_use_path(_binding_0);
}
UseTree::Name(_binding_0) => {
v.visit_use_name(_binding_0);
}
UseTree::Rename(_binding_0) => {
v.visit_use_rename(_binding_0);
}
UseTree::Glob(_binding_0) => {
v.visit_use_glob(_binding_0);
}
UseTree::Group(_binding_0) => {
v.visit_use_group(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_variadic<'ast, V>(v: &mut V, node: &'ast Variadic)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
tokens_helper(v, &node.dots.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_variant<'ast, V>(v: &mut V, node: &'ast Variant)
where
V: Visit<'ast> + ?Sized,
{
for it in &node.attrs {
v.visit_attribute(it);
}
v.visit_ident(&node.ident);
v.visit_fields(&node.fields);
if let Some(it) = &node.discriminant {
tokens_helper(v, &(it).0.spans);
v.visit_expr(&(it).1);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_vis_crate<'ast, V>(v: &mut V, node: &'ast VisCrate)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.crate_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_vis_public<'ast, V>(v: &mut V, node: &'ast VisPublic)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.pub_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_vis_restricted<'ast, V>(v: &mut V, node: &'ast VisRestricted)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.pub_token.span);
tokens_helper(v, &node.paren_token.span);
if let Some(it) = &node.in_token {
tokens_helper(v, &it.span);
}
v.visit_path(&*node.path);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_visibility<'ast, V>(v: &mut V, node: &'ast Visibility)
where
V: Visit<'ast> + ?Sized,
{
match node {
Visibility::Public(_binding_0) => {
v.visit_vis_public(_binding_0);
}
Visibility::Crate(_binding_0) => {
v.visit_vis_crate(_binding_0);
}
Visibility::Restricted(_binding_0) => {
v.visit_vis_restricted(_binding_0);
}
Visibility::Inherited => {}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_where_clause<'ast, V>(v: &mut V, node: &'ast WhereClause)
where
V: Visit<'ast> + ?Sized,
{
tokens_helper(v, &node.where_token.span);
for el in Punctuated::pairs(&node.predicates) {
let (it, p) = el.into_tuple();
v.visit_where_predicate(it);
if let Some(p) = p {
tokens_helper(v, &p.spans);
}
}
}src/attr.rs (line 183)
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pub fn parse_meta(&self) -> Result<Meta> {
fn clone_ident_segment(segment: &PathSegment) -> PathSegment {
PathSegment {
ident: segment.ident.clone(),
arguments: PathArguments::None,
}
}
let path = Path {
leading_colon: self
.path
.leading_colon
.as_ref()
.map(|colon| Token),
segments: self
.path
.segments
.pairs()
.map(|pair| match pair {
Pair::Punctuated(seg, punct) => {
Pair::Punctuated(clone_ident_segment(seg), Token)
}
Pair::End(seg) => Pair::End(clone_ident_segment(seg)),
})
.collect(),
};
let parser = |input: ParseStream| parsing::parse_meta_after_path(path, input);
parse::Parser::parse2(parser, self.tokens.clone())
}src/item.rs (line 3285)
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fn to_tokens(&self, tokens: &mut TokenStream) {
self.constness.to_tokens(tokens);
self.asyncness.to_tokens(tokens);
self.unsafety.to_tokens(tokens);
self.abi.to_tokens(tokens);
self.fn_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
self.paren_token.surround(tokens, |tokens| {
let mut last_is_variadic = false;
for pair in self.inputs.pairs() {
last_is_variadic = maybe_variadic_to_tokens(pair.value(), tokens);
pair.punct().to_tokens(tokens);
}
if self.variadic.is_some() && !last_is_variadic {
if !self.inputs.empty_or_trailing() {
<Token![,]>::default().to_tokens(tokens);
}
self.variadic.to_tokens(tokens);
}
});
self.output.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
}src/generics.rs (line 1072)
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fn to_tokens(&self, tokens: &mut TokenStream) {
if self.params.is_empty() {
return;
}
TokensOrDefault(&self.lt_token).to_tokens(tokens);
// Print lifetimes before types and consts, regardless of their
// order in self.params.
//
// TODO: ordering rules for const parameters vs type parameters have
// not been settled yet. https://github.com/rust-lang/rust/issues/44580
let mut trailing_or_empty = true;
for param in self.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
}
for param in self.params.pairs() {
match **param.value() {
GenericParam::Type(_) | GenericParam::Const(_) => {
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
trailing_or_empty = true;
}
param.to_tokens(tokens);
}
GenericParam::Lifetime(_) => {}
}
}
TokensOrDefault(&self.gt_token).to_tokens(tokens);
}
}
impl<'a> ToTokens for ImplGenerics<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if self.0.params.is_empty() {
return;
}
TokensOrDefault(&self.0.lt_token).to_tokens(tokens);
// Print lifetimes before types and consts, regardless of their
// order in self.params.
//
// TODO: ordering rules for const parameters vs type parameters have
// not been settled yet. https://github.com/rust-lang/rust/issues/44580
let mut trailing_or_empty = true;
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
}
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
continue;
}
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
trailing_or_empty = true;
}
match *param.value() {
GenericParam::Lifetime(_) => unreachable!(),
GenericParam::Type(param) => {
// Leave off the type parameter defaults
tokens.append_all(param.attrs.outer());
param.ident.to_tokens(tokens);
if !param.bounds.is_empty() {
TokensOrDefault(¶m.colon_token).to_tokens(tokens);
param.bounds.to_tokens(tokens);
}
}
GenericParam::Const(param) => {
// Leave off the const parameter defaults
tokens.append_all(param.attrs.outer());
param.const_token.to_tokens(tokens);
param.ident.to_tokens(tokens);
param.colon_token.to_tokens(tokens);
param.ty.to_tokens(tokens);
}
}
param.punct().to_tokens(tokens);
}
TokensOrDefault(&self.0.gt_token).to_tokens(tokens);
}
}
impl<'a> ToTokens for TypeGenerics<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if self.0.params.is_empty() {
return;
}
TokensOrDefault(&self.0.lt_token).to_tokens(tokens);
// Print lifetimes before types and consts, regardless of their
// order in self.params.
//
// TODO: ordering rules for const parameters vs type parameters have
// not been settled yet. https://github.com/rust-lang/rust/issues/44580
let mut trailing_or_empty = true;
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(def) = *param.value() {
// Leave off the lifetime bounds and attributes
def.lifetime.to_tokens(tokens);
param.punct().to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
}
for param in self.0.params.pairs() {
if let GenericParam::Lifetime(_) = **param.value() {
continue;
}
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
trailing_or_empty = true;
}
match *param.value() {
GenericParam::Lifetime(_) => unreachable!(),
GenericParam::Type(param) => {
// Leave off the type parameter defaults
param.ident.to_tokens(tokens);
}
GenericParam::Const(param) => {
// Leave off the const parameter defaults
param.ident.to_tokens(tokens);
}
}
param.punct().to_tokens(tokens);
}
TokensOrDefault(&self.0.gt_token).to_tokens(tokens);
}
}
impl<'a> ToTokens for Turbofish<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if !self.0.params.is_empty() {
<Token![::]>::default().to_tokens(tokens);
TypeGenerics(self.0).to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for BoundLifetimes {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.for_token.to_tokens(tokens);
self.lt_token.to_tokens(tokens);
self.lifetimes.to_tokens(tokens);
self.gt_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for LifetimeDef {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.lifetime.to_tokens(tokens);
if !self.bounds.is_empty() {
TokensOrDefault(&self.colon_token).to_tokens(tokens);
self.bounds.to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TypeParam {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.ident.to_tokens(tokens);
if !self.bounds.is_empty() {
TokensOrDefault(&self.colon_token).to_tokens(tokens);
self.bounds.to_tokens(tokens);
}
if let Some(default) = &self.default {
#[cfg(feature = "full")]
{
if self.eq_token.is_none() {
if let Type::Verbatim(default) = default {
let mut iter = default.clone().into_iter().peekable();
while let Some(token) = iter.next() {
if let TokenTree::Punct(q) = token {
if q.as_char() == '~' {
if let Some(TokenTree::Ident(c)) = iter.peek() {
if c == "const" {
if self.bounds.is_empty() {
TokensOrDefault(&self.colon_token)
.to_tokens(tokens);
}
return default.to_tokens(tokens);
}
}
}
}
}
}
}
}
TokensOrDefault(&self.eq_token).to_tokens(tokens);
default.to_tokens(tokens);
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TraitBound {
fn to_tokens(&self, tokens: &mut TokenStream) {
let to_tokens = |tokens: &mut TokenStream| {
#[cfg(feature = "full")]
let skip = match self.path.segments.pairs().next() {
Some(Pair::Punctuated(t, p)) if t.ident == "const" => {
Token.to_tokens(tokens);
t.to_tokens(tokens);
1
}
_ => 0,
};
self.modifier.to_tokens(tokens);
self.lifetimes.to_tokens(tokens);
#[cfg(feature = "full")]
{
self.path.leading_colon.to_tokens(tokens);
tokens.append_all(self.path.segments.pairs().skip(skip));
}
#[cfg(not(feature = "full"))]
{
self.path.to_tokens(tokens);
}
};
match &self.paren_token {
Some(paren) => paren.surround(tokens, to_tokens),
None => to_tokens(tokens),
}
}src/path.rs (line 761)
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fn to_tokens(&self, tokens: &mut TokenStream) {
self.colon2_token.to_tokens(tokens);
self.lt_token.to_tokens(tokens);
// Print lifetimes before types/consts/bindings, regardless of their
// order in self.args.
let mut trailing_or_empty = true;
for param in self.args.pairs() {
match **param.value() {
GenericArgument::Lifetime(_) => {
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
GenericArgument::Type(_)
| GenericArgument::Const(_)
| GenericArgument::Binding(_)
| GenericArgument::Constraint(_) => {}
}
}
for param in self.args.pairs() {
match **param.value() {
GenericArgument::Type(_)
| GenericArgument::Const(_)
| GenericArgument::Binding(_)
| GenericArgument::Constraint(_) => {
if !trailing_or_empty {
<Token![,]>::default().to_tokens(tokens);
}
param.to_tokens(tokens);
trailing_or_empty = param.punct().is_some();
}
GenericArgument::Lifetime(_) => {}
}
}
self.gt_token.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for Binding {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
self.eq_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for Constraint {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
self.colon_token.to_tokens(tokens);
self.bounds.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for ParenthesizedGenericArguments {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.paren_token.surround(tokens, |tokens| {
self.inputs.to_tokens(tokens);
});
self.output.to_tokens(tokens);
}
}
pub(crate) fn print_path(tokens: &mut TokenStream, qself: &Option<QSelf>, path: &Path) {
let qself = match qself {
Some(qself) => qself,
None => {
path.to_tokens(tokens);
return;
}
};
qself.lt_token.to_tokens(tokens);
qself.ty.to_tokens(tokens);
let pos = cmp::min(qself.position, path.segments.len());
let mut segments = path.segments.pairs();
if pos > 0 {
TokensOrDefault(&qself.as_token).to_tokens(tokens);
path.leading_colon.to_tokens(tokens);
for (i, segment) in segments.by_ref().take(pos).enumerate() {
if i + 1 == pos {
segment.value().to_tokens(tokens);
qself.gt_token.to_tokens(tokens);
segment.punct().to_tokens(tokens);
} else {
segment.to_tokens(tokens);
}
}
} else {
qself.gt_token.to_tokens(tokens);
path.leading_colon.to_tokens(tokens);
}
for segment in segments {
segment.to_tokens(tokens);
}
}sourcepub fn pairs_mut(&mut self) -> PairsMut<'_, T, P> ⓘ
pub fn pairs_mut(&mut self) -> PairsMut<'_, T, P> ⓘ
Returns an iterator over the contents of this sequence as mutably borrowed punctuated pairs.
Examples found in repository?
src/gen/visit_mut.rs (line 801)
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pub fn visit_angle_bracketed_generic_arguments_mut<V>(
v: &mut V,
node: &mut AngleBracketedGenericArguments,
)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.colon2_token {
tokens_helper(v, &mut it.spans);
}
tokens_helper(v, &mut node.lt_token.spans);
for el in Punctuated::pairs_mut(&mut node.args) {
let (it, p) = el.into_tuple();
v.visit_generic_argument_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
tokens_helper(v, &mut node.gt_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_arm_mut<V>(v: &mut V, node: &mut Arm)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_pat_mut(&mut node.pat);
if let Some(it) = &mut node.guard {
tokens_helper(v, &mut (it).0.span);
v.visit_expr_mut(&mut *(it).1);
}
tokens_helper(v, &mut node.fat_arrow_token.spans);
v.visit_expr_mut(&mut *node.body);
if let Some(it) = &mut node.comma {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_attr_style_mut<V>(v: &mut V, node: &mut AttrStyle)
where
V: VisitMut + ?Sized,
{
match node {
AttrStyle::Outer => {}
AttrStyle::Inner(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_attribute_mut<V>(v: &mut V, node: &mut Attribute)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.pound_token.spans);
v.visit_attr_style_mut(&mut node.style);
tokens_helper(v, &mut node.bracket_token.span);
v.visit_path_mut(&mut node.path);
skip!(node.tokens);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_bare_fn_arg_mut<V>(v: &mut V, node: &mut BareFnArg)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.name {
v.visit_ident_mut(&mut (it).0);
tokens_helper(v, &mut (it).1.spans);
}
v.visit_type_mut(&mut node.ty);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_bin_op_mut<V>(v: &mut V, node: &mut BinOp)
where
V: VisitMut + ?Sized,
{
match node {
BinOp::Add(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Sub(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Mul(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Div(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Rem(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::And(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Or(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::BitXor(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::BitAnd(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::BitOr(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Shl(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Shr(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Eq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Lt(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Le(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Ne(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Ge(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::Gt(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::AddEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::SubEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::MulEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::DivEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::RemEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::BitXorEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::BitAndEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::BitOrEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::ShlEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
BinOp::ShrEq(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_binding_mut<V>(v: &mut V, node: &mut Binding)
where
V: VisitMut + ?Sized,
{
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_type_mut(&mut node.ty);
}
#[cfg(feature = "full")]
pub fn visit_block_mut<V>(v: &mut V, node: &mut Block)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.brace_token.span);
for it in &mut node.stmts {
v.visit_stmt_mut(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_bound_lifetimes_mut<V>(v: &mut V, node: &mut BoundLifetimes)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.for_token.span);
tokens_helper(v, &mut node.lt_token.spans);
for el in Punctuated::pairs_mut(&mut node.lifetimes) {
let (it, p) = el.into_tuple();
v.visit_lifetime_def_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
tokens_helper(v, &mut node.gt_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_const_param_mut<V>(v: &mut V, node: &mut ConstParam)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.const_token.span);
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut node.ty);
if let Some(it) = &mut node.eq_token {
tokens_helper(v, &mut it.spans);
}
if let Some(it) = &mut node.default {
v.visit_expr_mut(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_constraint_mut<V>(v: &mut V, node: &mut Constraint)
where
V: VisitMut + ?Sized,
{
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon_token.spans);
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "derive")]
pub fn visit_data_mut<V>(v: &mut V, node: &mut Data)
where
V: VisitMut + ?Sized,
{
match node {
Data::Struct(_binding_0) => {
v.visit_data_struct_mut(_binding_0);
}
Data::Enum(_binding_0) => {
v.visit_data_enum_mut(_binding_0);
}
Data::Union(_binding_0) => {
v.visit_data_union_mut(_binding_0);
}
}
}
#[cfg(feature = "derive")]
pub fn visit_data_enum_mut<V>(v: &mut V, node: &mut DataEnum)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.enum_token.span);
tokens_helper(v, &mut node.brace_token.span);
for el in Punctuated::pairs_mut(&mut node.variants) {
let (it, p) = el.into_tuple();
v.visit_variant_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "derive")]
pub fn visit_data_struct_mut<V>(v: &mut V, node: &mut DataStruct)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.struct_token.span);
v.visit_fields_mut(&mut node.fields);
if let Some(it) = &mut node.semi_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "derive")]
pub fn visit_data_union_mut<V>(v: &mut V, node: &mut DataUnion)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.union_token.span);
v.visit_fields_named_mut(&mut node.fields);
}
#[cfg(feature = "derive")]
pub fn visit_derive_input_mut<V>(v: &mut V, node: &mut DeriveInput)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
v.visit_data_mut(&mut node.data);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_mut<V>(v: &mut V, node: &mut Expr)
where
V: VisitMut + ?Sized,
{
match node {
Expr::Array(_binding_0) => {
full!(v.visit_expr_array_mut(_binding_0));
}
Expr::Assign(_binding_0) => {
full!(v.visit_expr_assign_mut(_binding_0));
}
Expr::AssignOp(_binding_0) => {
full!(v.visit_expr_assign_op_mut(_binding_0));
}
Expr::Async(_binding_0) => {
full!(v.visit_expr_async_mut(_binding_0));
}
Expr::Await(_binding_0) => {
full!(v.visit_expr_await_mut(_binding_0));
}
Expr::Binary(_binding_0) => {
v.visit_expr_binary_mut(_binding_0);
}
Expr::Block(_binding_0) => {
full!(v.visit_expr_block_mut(_binding_0));
}
Expr::Box(_binding_0) => {
full!(v.visit_expr_box_mut(_binding_0));
}
Expr::Break(_binding_0) => {
full!(v.visit_expr_break_mut(_binding_0));
}
Expr::Call(_binding_0) => {
v.visit_expr_call_mut(_binding_0);
}
Expr::Cast(_binding_0) => {
v.visit_expr_cast_mut(_binding_0);
}
Expr::Closure(_binding_0) => {
full!(v.visit_expr_closure_mut(_binding_0));
}
Expr::Continue(_binding_0) => {
full!(v.visit_expr_continue_mut(_binding_0));
}
Expr::Field(_binding_0) => {
v.visit_expr_field_mut(_binding_0);
}
Expr::ForLoop(_binding_0) => {
full!(v.visit_expr_for_loop_mut(_binding_0));
}
Expr::Group(_binding_0) => {
full!(v.visit_expr_group_mut(_binding_0));
}
Expr::If(_binding_0) => {
full!(v.visit_expr_if_mut(_binding_0));
}
Expr::Index(_binding_0) => {
v.visit_expr_index_mut(_binding_0);
}
Expr::Let(_binding_0) => {
full!(v.visit_expr_let_mut(_binding_0));
}
Expr::Lit(_binding_0) => {
v.visit_expr_lit_mut(_binding_0);
}
Expr::Loop(_binding_0) => {
full!(v.visit_expr_loop_mut(_binding_0));
}
Expr::Macro(_binding_0) => {
full!(v.visit_expr_macro_mut(_binding_0));
}
Expr::Match(_binding_0) => {
full!(v.visit_expr_match_mut(_binding_0));
}
Expr::MethodCall(_binding_0) => {
full!(v.visit_expr_method_call_mut(_binding_0));
}
Expr::Paren(_binding_0) => {
v.visit_expr_paren_mut(_binding_0);
}
Expr::Path(_binding_0) => {
v.visit_expr_path_mut(_binding_0);
}
Expr::Range(_binding_0) => {
full!(v.visit_expr_range_mut(_binding_0));
}
Expr::Reference(_binding_0) => {
full!(v.visit_expr_reference_mut(_binding_0));
}
Expr::Repeat(_binding_0) => {
full!(v.visit_expr_repeat_mut(_binding_0));
}
Expr::Return(_binding_0) => {
full!(v.visit_expr_return_mut(_binding_0));
}
Expr::Struct(_binding_0) => {
full!(v.visit_expr_struct_mut(_binding_0));
}
Expr::Try(_binding_0) => {
full!(v.visit_expr_try_mut(_binding_0));
}
Expr::TryBlock(_binding_0) => {
full!(v.visit_expr_try_block_mut(_binding_0));
}
Expr::Tuple(_binding_0) => {
full!(v.visit_expr_tuple_mut(_binding_0));
}
Expr::Type(_binding_0) => {
full!(v.visit_expr_type_mut(_binding_0));
}
Expr::Unary(_binding_0) => {
v.visit_expr_unary_mut(_binding_0);
}
Expr::Unsafe(_binding_0) => {
full!(v.visit_expr_unsafe_mut(_binding_0));
}
Expr::Verbatim(_binding_0) => {
skip!(_binding_0);
}
Expr::While(_binding_0) => {
full!(v.visit_expr_while_mut(_binding_0));
}
Expr::Yield(_binding_0) => {
full!(v.visit_expr_yield_mut(_binding_0));
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_expr_array_mut<V>(v: &mut V, node: &mut ExprArray)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.bracket_token.span);
for el in Punctuated::pairs_mut(&mut node.elems) {
let (it, p) = el.into_tuple();
v.visit_expr_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_expr_assign_mut<V>(v: &mut V, node: &mut ExprAssign)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.left);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_expr_mut(&mut *node.right);
}
#[cfg(feature = "full")]
pub fn visit_expr_assign_op_mut<V>(v: &mut V, node: &mut ExprAssignOp)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.left);
v.visit_bin_op_mut(&mut node.op);
v.visit_expr_mut(&mut *node.right);
}
#[cfg(feature = "full")]
pub fn visit_expr_async_mut<V>(v: &mut V, node: &mut ExprAsync)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.async_token.span);
if let Some(it) = &mut node.capture {
tokens_helper(v, &mut it.span);
}
v.visit_block_mut(&mut node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_await_mut<V>(v: &mut V, node: &mut ExprAwait)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.base);
tokens_helper(v, &mut node.dot_token.spans);
tokens_helper(v, &mut node.await_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_binary_mut<V>(v: &mut V, node: &mut ExprBinary)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.left);
v.visit_bin_op_mut(&mut node.op);
v.visit_expr_mut(&mut *node.right);
}
#[cfg(feature = "full")]
pub fn visit_expr_block_mut<V>(v: &mut V, node: &mut ExprBlock)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.label {
v.visit_label_mut(it);
}
v.visit_block_mut(&mut node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_box_mut<V>(v: &mut V, node: &mut ExprBox)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.box_token.span);
v.visit_expr_mut(&mut *node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_break_mut<V>(v: &mut V, node: &mut ExprBreak)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.break_token.span);
if let Some(it) = &mut node.label {
v.visit_lifetime_mut(it);
}
if let Some(it) = &mut node.expr {
v.visit_expr_mut(&mut **it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_call_mut<V>(v: &mut V, node: &mut ExprCall)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.func);
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.args) {
let (it, p) = el.into_tuple();
v.visit_expr_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_cast_mut<V>(v: &mut V, node: &mut ExprCast)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.as_token.span);
v.visit_type_mut(&mut *node.ty);
}
#[cfg(feature = "full")]
pub fn visit_expr_closure_mut<V>(v: &mut V, node: &mut ExprClosure)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.movability {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.asyncness {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.capture {
tokens_helper(v, &mut it.span);
}
tokens_helper(v, &mut node.or1_token.spans);
for el in Punctuated::pairs_mut(&mut node.inputs) {
let (it, p) = el.into_tuple();
v.visit_pat_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
tokens_helper(v, &mut node.or2_token.spans);
v.visit_return_type_mut(&mut node.output);
v.visit_expr_mut(&mut *node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_continue_mut<V>(v: &mut V, node: &mut ExprContinue)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.continue_token.span);
if let Some(it) = &mut node.label {
v.visit_lifetime_mut(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_field_mut<V>(v: &mut V, node: &mut ExprField)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.base);
tokens_helper(v, &mut node.dot_token.spans);
v.visit_member_mut(&mut node.member);
}
#[cfg(feature = "full")]
pub fn visit_expr_for_loop_mut<V>(v: &mut V, node: &mut ExprForLoop)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.label {
v.visit_label_mut(it);
}
tokens_helper(v, &mut node.for_token.span);
v.visit_pat_mut(&mut node.pat);
tokens_helper(v, &mut node.in_token.span);
v.visit_expr_mut(&mut *node.expr);
v.visit_block_mut(&mut node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_group_mut<V>(v: &mut V, node: &mut ExprGroup)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.group_token.span);
v.visit_expr_mut(&mut *node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_if_mut<V>(v: &mut V, node: &mut ExprIf)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.if_token.span);
v.visit_expr_mut(&mut *node.cond);
v.visit_block_mut(&mut node.then_branch);
if let Some(it) = &mut node.else_branch {
tokens_helper(v, &mut (it).0.span);
v.visit_expr_mut(&mut *(it).1);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_index_mut<V>(v: &mut V, node: &mut ExprIndex)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.bracket_token.span);
v.visit_expr_mut(&mut *node.index);
}
#[cfg(feature = "full")]
pub fn visit_expr_let_mut<V>(v: &mut V, node: &mut ExprLet)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.let_token.span);
v.visit_pat_mut(&mut node.pat);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_expr_mut(&mut *node.expr);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_lit_mut<V>(v: &mut V, node: &mut ExprLit)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_lit_mut(&mut node.lit);
}
#[cfg(feature = "full")]
pub fn visit_expr_loop_mut<V>(v: &mut V, node: &mut ExprLoop)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.label {
v.visit_label_mut(it);
}
tokens_helper(v, &mut node.loop_token.span);
v.visit_block_mut(&mut node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_macro_mut<V>(v: &mut V, node: &mut ExprMacro)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_macro_mut(&mut node.mac);
}
#[cfg(feature = "full")]
pub fn visit_expr_match_mut<V>(v: &mut V, node: &mut ExprMatch)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.match_token.span);
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.brace_token.span);
for it in &mut node.arms {
v.visit_arm_mut(it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_method_call_mut<V>(v: &mut V, node: &mut ExprMethodCall)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.receiver);
tokens_helper(v, &mut node.dot_token.spans);
v.visit_ident_mut(&mut node.method);
if let Some(it) = &mut node.turbofish {
v.visit_method_turbofish_mut(it);
}
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.args) {
let (it, p) = el.into_tuple();
v.visit_expr_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_paren_mut<V>(v: &mut V, node: &mut ExprParen)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.paren_token.span);
v.visit_expr_mut(&mut *node.expr);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_path_mut<V>(v: &mut V, node: &mut ExprPath)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.qself {
v.visit_qself_mut(it);
}
v.visit_path_mut(&mut node.path);
}
#[cfg(feature = "full")]
pub fn visit_expr_range_mut<V>(v: &mut V, node: &mut ExprRange)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.from {
v.visit_expr_mut(&mut **it);
}
v.visit_range_limits_mut(&mut node.limits);
if let Some(it) = &mut node.to {
v.visit_expr_mut(&mut **it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_reference_mut<V>(v: &mut V, node: &mut ExprReference)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.and_token.spans);
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
v.visit_expr_mut(&mut *node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_repeat_mut<V>(v: &mut V, node: &mut ExprRepeat)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.bracket_token.span);
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.semi_token.spans);
v.visit_expr_mut(&mut *node.len);
}
#[cfg(feature = "full")]
pub fn visit_expr_return_mut<V>(v: &mut V, node: &mut ExprReturn)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.return_token.span);
if let Some(it) = &mut node.expr {
v.visit_expr_mut(&mut **it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_struct_mut<V>(v: &mut V, node: &mut ExprStruct)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_path_mut(&mut node.path);
tokens_helper(v, &mut node.brace_token.span);
for el in Punctuated::pairs_mut(&mut node.fields) {
let (it, p) = el.into_tuple();
v.visit_field_value_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
if let Some(it) = &mut node.dot2_token {
tokens_helper(v, &mut it.spans);
}
if let Some(it) = &mut node.rest {
v.visit_expr_mut(&mut **it);
}
}
#[cfg(feature = "full")]
pub fn visit_expr_try_mut<V>(v: &mut V, node: &mut ExprTry)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.question_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_expr_try_block_mut<V>(v: &mut V, node: &mut ExprTryBlock)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.try_token.span);
v.visit_block_mut(&mut node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_tuple_mut<V>(v: &mut V, node: &mut ExprTuple)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.elems) {
let (it, p) = el.into_tuple();
v.visit_expr_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_expr_type_mut<V>(v: &mut V, node: &mut ExprType)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut *node.ty);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_expr_unary_mut<V>(v: &mut V, node: &mut ExprUnary)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_un_op_mut(&mut node.op);
v.visit_expr_mut(&mut *node.expr);
}
#[cfg(feature = "full")]
pub fn visit_expr_unsafe_mut<V>(v: &mut V, node: &mut ExprUnsafe)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.unsafe_token.span);
v.visit_block_mut(&mut node.block);
}
#[cfg(feature = "full")]
pub fn visit_expr_while_mut<V>(v: &mut V, node: &mut ExprWhile)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.label {
v.visit_label_mut(it);
}
tokens_helper(v, &mut node.while_token.span);
v.visit_expr_mut(&mut *node.cond);
v.visit_block_mut(&mut node.body);
}
#[cfg(feature = "full")]
pub fn visit_expr_yield_mut<V>(v: &mut V, node: &mut ExprYield)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.yield_token.span);
if let Some(it) = &mut node.expr {
v.visit_expr_mut(&mut **it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_field_mut<V>(v: &mut V, node: &mut Field)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
if let Some(it) = &mut node.ident {
v.visit_ident_mut(it);
}
if let Some(it) = &mut node.colon_token {
tokens_helper(v, &mut it.spans);
}
v.visit_type_mut(&mut node.ty);
}
#[cfg(feature = "full")]
pub fn visit_field_pat_mut<V>(v: &mut V, node: &mut FieldPat)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_member_mut(&mut node.member);
if let Some(it) = &mut node.colon_token {
tokens_helper(v, &mut it.spans);
}
v.visit_pat_mut(&mut *node.pat);
}
#[cfg(feature = "full")]
pub fn visit_field_value_mut<V>(v: &mut V, node: &mut FieldValue)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_member_mut(&mut node.member);
if let Some(it) = &mut node.colon_token {
tokens_helper(v, &mut it.spans);
}
v.visit_expr_mut(&mut node.expr);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_fields_mut<V>(v: &mut V, node: &mut Fields)
where
V: VisitMut + ?Sized,
{
match node {
Fields::Named(_binding_0) => {
v.visit_fields_named_mut(_binding_0);
}
Fields::Unnamed(_binding_0) => {
v.visit_fields_unnamed_mut(_binding_0);
}
Fields::Unit => {}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_fields_named_mut<V>(v: &mut V, node: &mut FieldsNamed)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.brace_token.span);
for el in Punctuated::pairs_mut(&mut node.named) {
let (it, p) = el.into_tuple();
v.visit_field_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_fields_unnamed_mut<V>(v: &mut V, node: &mut FieldsUnnamed)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.unnamed) {
let (it, p) = el.into_tuple();
v.visit_field_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_file_mut<V>(v: &mut V, node: &mut File)
where
V: VisitMut + ?Sized,
{
skip!(node.shebang);
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
for it in &mut node.items {
v.visit_item_mut(it);
}
}
#[cfg(feature = "full")]
pub fn visit_fn_arg_mut<V>(v: &mut V, node: &mut FnArg)
where
V: VisitMut + ?Sized,
{
match node {
FnArg::Receiver(_binding_0) => {
v.visit_receiver_mut(_binding_0);
}
FnArg::Typed(_binding_0) => {
v.visit_pat_type_mut(_binding_0);
}
}
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_mut<V>(v: &mut V, node: &mut ForeignItem)
where
V: VisitMut + ?Sized,
{
match node {
ForeignItem::Fn(_binding_0) => {
v.visit_foreign_item_fn_mut(_binding_0);
}
ForeignItem::Static(_binding_0) => {
v.visit_foreign_item_static_mut(_binding_0);
}
ForeignItem::Type(_binding_0) => {
v.visit_foreign_item_type_mut(_binding_0);
}
ForeignItem::Macro(_binding_0) => {
v.visit_foreign_item_macro_mut(_binding_0);
}
ForeignItem::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_fn_mut<V>(v: &mut V, node: &mut ForeignItemFn)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
v.visit_signature_mut(&mut node.sig);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_macro_mut<V>(v: &mut V, node: &mut ForeignItemMacro)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_macro_mut(&mut node.mac);
if let Some(it) = &mut node.semi_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_static_mut<V>(v: &mut V, node: &mut ForeignItemStatic)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.static_token.span);
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut *node.ty);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_foreign_item_type_mut<V>(v: &mut V, node: &mut ForeignItemType)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.type_token.span);
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_generic_argument_mut<V>(v: &mut V, node: &mut GenericArgument)
where
V: VisitMut + ?Sized,
{
match node {
GenericArgument::Lifetime(_binding_0) => {
v.visit_lifetime_mut(_binding_0);
}
GenericArgument::Type(_binding_0) => {
v.visit_type_mut(_binding_0);
}
GenericArgument::Const(_binding_0) => {
v.visit_expr_mut(_binding_0);
}
GenericArgument::Binding(_binding_0) => {
v.visit_binding_mut(_binding_0);
}
GenericArgument::Constraint(_binding_0) => {
v.visit_constraint_mut(_binding_0);
}
}
}
#[cfg(feature = "full")]
pub fn visit_generic_method_argument_mut<V>(v: &mut V, node: &mut GenericMethodArgument)
where
V: VisitMut + ?Sized,
{
match node {
GenericMethodArgument::Type(_binding_0) => {
v.visit_type_mut(_binding_0);
}
GenericMethodArgument::Const(_binding_0) => {
v.visit_expr_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_generic_param_mut<V>(v: &mut V, node: &mut GenericParam)
where
V: VisitMut + ?Sized,
{
match node {
GenericParam::Type(_binding_0) => {
v.visit_type_param_mut(_binding_0);
}
GenericParam::Lifetime(_binding_0) => {
v.visit_lifetime_def_mut(_binding_0);
}
GenericParam::Const(_binding_0) => {
v.visit_const_param_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_generics_mut<V>(v: &mut V, node: &mut Generics)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.lt_token {
tokens_helper(v, &mut it.spans);
}
for el in Punctuated::pairs_mut(&mut node.params) {
let (it, p) = el.into_tuple();
v.visit_generic_param_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
if let Some(it) = &mut node.gt_token {
tokens_helper(v, &mut it.spans);
}
if let Some(it) = &mut node.where_clause {
v.visit_where_clause_mut(it);
}
}
pub fn visit_ident_mut<V>(v: &mut V, node: &mut Ident)
where
V: VisitMut + ?Sized,
{
let mut span = node.span();
v.visit_span_mut(&mut span);
node.set_span(span);
}
#[cfg(feature = "full")]
pub fn visit_impl_item_mut<V>(v: &mut V, node: &mut ImplItem)
where
V: VisitMut + ?Sized,
{
match node {
ImplItem::Const(_binding_0) => {
v.visit_impl_item_const_mut(_binding_0);
}
ImplItem::Method(_binding_0) => {
v.visit_impl_item_method_mut(_binding_0);
}
ImplItem::Type(_binding_0) => {
v.visit_impl_item_type_mut(_binding_0);
}
ImplItem::Macro(_binding_0) => {
v.visit_impl_item_macro_mut(_binding_0);
}
ImplItem::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_impl_item_const_mut<V>(v: &mut V, node: &mut ImplItemConst)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
if let Some(it) = &mut node.defaultness {
tokens_helper(v, &mut it.span);
}
tokens_helper(v, &mut node.const_token.span);
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut node.ty);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_expr_mut(&mut node.expr);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_impl_item_macro_mut<V>(v: &mut V, node: &mut ImplItemMacro)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_macro_mut(&mut node.mac);
if let Some(it) = &mut node.semi_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_impl_item_method_mut<V>(v: &mut V, node: &mut ImplItemMethod)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
if let Some(it) = &mut node.defaultness {
tokens_helper(v, &mut it.span);
}
v.visit_signature_mut(&mut node.sig);
v.visit_block_mut(&mut node.block);
}
#[cfg(feature = "full")]
pub fn visit_impl_item_type_mut<V>(v: &mut V, node: &mut ImplItemType)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
if let Some(it) = &mut node.defaultness {
tokens_helper(v, &mut it.span);
}
tokens_helper(v, &mut node.type_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_type_mut(&mut node.ty);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_index_mut<V>(v: &mut V, node: &mut Index)
where
V: VisitMut + ?Sized,
{
skip!(node.index);
v.visit_span_mut(&mut node.span);
}
#[cfg(feature = "full")]
pub fn visit_item_mut<V>(v: &mut V, node: &mut Item)
where
V: VisitMut + ?Sized,
{
match node {
Item::Const(_binding_0) => {
v.visit_item_const_mut(_binding_0);
}
Item::Enum(_binding_0) => {
v.visit_item_enum_mut(_binding_0);
}
Item::ExternCrate(_binding_0) => {
v.visit_item_extern_crate_mut(_binding_0);
}
Item::Fn(_binding_0) => {
v.visit_item_fn_mut(_binding_0);
}
Item::ForeignMod(_binding_0) => {
v.visit_item_foreign_mod_mut(_binding_0);
}
Item::Impl(_binding_0) => {
v.visit_item_impl_mut(_binding_0);
}
Item::Macro(_binding_0) => {
v.visit_item_macro_mut(_binding_0);
}
Item::Macro2(_binding_0) => {
v.visit_item_macro2_mut(_binding_0);
}
Item::Mod(_binding_0) => {
v.visit_item_mod_mut(_binding_0);
}
Item::Static(_binding_0) => {
v.visit_item_static_mut(_binding_0);
}
Item::Struct(_binding_0) => {
v.visit_item_struct_mut(_binding_0);
}
Item::Trait(_binding_0) => {
v.visit_item_trait_mut(_binding_0);
}
Item::TraitAlias(_binding_0) => {
v.visit_item_trait_alias_mut(_binding_0);
}
Item::Type(_binding_0) => {
v.visit_item_type_mut(_binding_0);
}
Item::Union(_binding_0) => {
v.visit_item_union_mut(_binding_0);
}
Item::Use(_binding_0) => {
v.visit_item_use_mut(_binding_0);
}
Item::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_item_const_mut<V>(v: &mut V, node: &mut ItemConst)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.const_token.span);
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut *node.ty);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_enum_mut<V>(v: &mut V, node: &mut ItemEnum)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.enum_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
tokens_helper(v, &mut node.brace_token.span);
for el in Punctuated::pairs_mut(&mut node.variants) {
let (it, p) = el.into_tuple();
v.visit_variant_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_item_extern_crate_mut<V>(v: &mut V, node: &mut ItemExternCrate)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.extern_token.span);
tokens_helper(v, &mut node.crate_token.span);
v.visit_ident_mut(&mut node.ident);
if let Some(it) = &mut node.rename {
tokens_helper(v, &mut (it).0.span);
v.visit_ident_mut(&mut (it).1);
}
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_fn_mut<V>(v: &mut V, node: &mut ItemFn)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
v.visit_signature_mut(&mut node.sig);
v.visit_block_mut(&mut *node.block);
}
#[cfg(feature = "full")]
pub fn visit_item_foreign_mod_mut<V>(v: &mut V, node: &mut ItemForeignMod)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_abi_mut(&mut node.abi);
tokens_helper(v, &mut node.brace_token.span);
for it in &mut node.items {
v.visit_foreign_item_mut(it);
}
}
#[cfg(feature = "full")]
pub fn visit_item_impl_mut<V>(v: &mut V, node: &mut ItemImpl)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.defaultness {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.unsafety {
tokens_helper(v, &mut it.span);
}
tokens_helper(v, &mut node.impl_token.span);
v.visit_generics_mut(&mut node.generics);
if let Some(it) = &mut node.trait_ {
if let Some(it) = &mut (it).0 {
tokens_helper(v, &mut it.spans);
}
v.visit_path_mut(&mut (it).1);
tokens_helper(v, &mut (it).2.span);
}
v.visit_type_mut(&mut *node.self_ty);
tokens_helper(v, &mut node.brace_token.span);
for it in &mut node.items {
v.visit_impl_item_mut(it);
}
}
#[cfg(feature = "full")]
pub fn visit_item_macro_mut<V>(v: &mut V, node: &mut ItemMacro)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.ident {
v.visit_ident_mut(it);
}
v.visit_macro_mut(&mut node.mac);
if let Some(it) = &mut node.semi_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_item_macro2_mut<V>(v: &mut V, node: &mut ItemMacro2)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.macro_token.span);
v.visit_ident_mut(&mut node.ident);
skip!(node.rules);
}
#[cfg(feature = "full")]
pub fn visit_item_mod_mut<V>(v: &mut V, node: &mut ItemMod)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.mod_token.span);
v.visit_ident_mut(&mut node.ident);
if let Some(it) = &mut node.content {
tokens_helper(v, &mut (it).0.span);
for it in &mut (it).1 {
v.visit_item_mut(it);
}
}
if let Some(it) = &mut node.semi {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_item_static_mut<V>(v: &mut V, node: &mut ItemStatic)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.static_token.span);
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut *node.ty);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_expr_mut(&mut *node.expr);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_struct_mut<V>(v: &mut V, node: &mut ItemStruct)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.struct_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
v.visit_fields_mut(&mut node.fields);
if let Some(it) = &mut node.semi_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_item_trait_mut<V>(v: &mut V, node: &mut ItemTrait)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
if let Some(it) = &mut node.unsafety {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.auto_token {
tokens_helper(v, &mut it.span);
}
tokens_helper(v, &mut node.trait_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
if let Some(it) = &mut node.colon_token {
tokens_helper(v, &mut it.spans);
}
for el in Punctuated::pairs_mut(&mut node.supertraits) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
tokens_helper(v, &mut node.brace_token.span);
for it in &mut node.items {
v.visit_trait_item_mut(it);
}
}
#[cfg(feature = "full")]
pub fn visit_item_trait_alias_mut<V>(v: &mut V, node: &mut ItemTraitAlias)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.trait_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
tokens_helper(v, &mut node.eq_token.spans);
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_type_mut<V>(v: &mut V, node: &mut ItemType)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.type_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_type_mut(&mut *node.ty);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_item_union_mut<V>(v: &mut V, node: &mut ItemUnion)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.union_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
v.visit_fields_named_mut(&mut node.fields);
}
#[cfg(feature = "full")]
pub fn visit_item_use_mut<V>(v: &mut V, node: &mut ItemUse)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_visibility_mut(&mut node.vis);
tokens_helper(v, &mut node.use_token.span);
if let Some(it) = &mut node.leading_colon {
tokens_helper(v, &mut it.spans);
}
v.visit_use_tree_mut(&mut node.tree);
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_label_mut<V>(v: &mut V, node: &mut Label)
where
V: VisitMut + ?Sized,
{
v.visit_lifetime_mut(&mut node.name);
tokens_helper(v, &mut node.colon_token.spans);
}
pub fn visit_lifetime_mut<V>(v: &mut V, node: &mut Lifetime)
where
V: VisitMut + ?Sized,
{
v.visit_span_mut(&mut node.apostrophe);
v.visit_ident_mut(&mut node.ident);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_lifetime_def_mut<V>(v: &mut V, node: &mut LifetimeDef)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_lifetime_mut(&mut node.lifetime);
if let Some(it) = &mut node.colon_token {
tokens_helper(v, &mut it.spans);
}
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_lifetime_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
pub fn visit_lit_mut<V>(v: &mut V, node: &mut Lit)
where
V: VisitMut + ?Sized,
{
match node {
Lit::Str(_binding_0) => {
v.visit_lit_str_mut(_binding_0);
}
Lit::ByteStr(_binding_0) => {
v.visit_lit_byte_str_mut(_binding_0);
}
Lit::Byte(_binding_0) => {
v.visit_lit_byte_mut(_binding_0);
}
Lit::Char(_binding_0) => {
v.visit_lit_char_mut(_binding_0);
}
Lit::Int(_binding_0) => {
v.visit_lit_int_mut(_binding_0);
}
Lit::Float(_binding_0) => {
v.visit_lit_float_mut(_binding_0);
}
Lit::Bool(_binding_0) => {
v.visit_lit_bool_mut(_binding_0);
}
Lit::Verbatim(_binding_0) => {
skip!(_binding_0);
}
}
}
pub fn visit_lit_bool_mut<V>(v: &mut V, node: &mut LitBool)
where
V: VisitMut + ?Sized,
{
skip!(node.value);
v.visit_span_mut(&mut node.span);
}
pub fn visit_lit_byte_mut<V>(v: &mut V, node: &mut LitByte)
where
V: VisitMut + ?Sized,
{}
pub fn visit_lit_byte_str_mut<V>(v: &mut V, node: &mut LitByteStr)
where
V: VisitMut + ?Sized,
{}
pub fn visit_lit_char_mut<V>(v: &mut V, node: &mut LitChar)
where
V: VisitMut + ?Sized,
{}
pub fn visit_lit_float_mut<V>(v: &mut V, node: &mut LitFloat)
where
V: VisitMut + ?Sized,
{}
pub fn visit_lit_int_mut<V>(v: &mut V, node: &mut LitInt)
where
V: VisitMut + ?Sized,
{}
pub fn visit_lit_str_mut<V>(v: &mut V, node: &mut LitStr)
where
V: VisitMut + ?Sized,
{}
#[cfg(feature = "full")]
pub fn visit_local_mut<V>(v: &mut V, node: &mut Local)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.let_token.span);
v.visit_pat_mut(&mut node.pat);
if let Some(it) = &mut node.init {
tokens_helper(v, &mut (it).0.spans);
v.visit_expr_mut(&mut *(it).1);
}
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_macro_mut<V>(v: &mut V, node: &mut Macro)
where
V: VisitMut + ?Sized,
{
v.visit_path_mut(&mut node.path);
tokens_helper(v, &mut node.bang_token.spans);
v.visit_macro_delimiter_mut(&mut node.delimiter);
skip!(node.tokens);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_macro_delimiter_mut<V>(v: &mut V, node: &mut MacroDelimiter)
where
V: VisitMut + ?Sized,
{
match node {
MacroDelimiter::Paren(_binding_0) => {
tokens_helper(v, &mut _binding_0.span);
}
MacroDelimiter::Brace(_binding_0) => {
tokens_helper(v, &mut _binding_0.span);
}
MacroDelimiter::Bracket(_binding_0) => {
tokens_helper(v, &mut _binding_0.span);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_member_mut<V>(v: &mut V, node: &mut Member)
where
V: VisitMut + ?Sized,
{
match node {
Member::Named(_binding_0) => {
v.visit_ident_mut(_binding_0);
}
Member::Unnamed(_binding_0) => {
v.visit_index_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_meta_mut<V>(v: &mut V, node: &mut Meta)
where
V: VisitMut + ?Sized,
{
match node {
Meta::Path(_binding_0) => {
v.visit_path_mut(_binding_0);
}
Meta::List(_binding_0) => {
v.visit_meta_list_mut(_binding_0);
}
Meta::NameValue(_binding_0) => {
v.visit_meta_name_value_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_meta_list_mut<V>(v: &mut V, node: &mut MetaList)
where
V: VisitMut + ?Sized,
{
v.visit_path_mut(&mut node.path);
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.nested) {
let (it, p) = el.into_tuple();
v.visit_nested_meta_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_meta_name_value_mut<V>(v: &mut V, node: &mut MetaNameValue)
where
V: VisitMut + ?Sized,
{
v.visit_path_mut(&mut node.path);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_lit_mut(&mut node.lit);
}
#[cfg(feature = "full")]
pub fn visit_method_turbofish_mut<V>(v: &mut V, node: &mut MethodTurbofish)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.colon2_token.spans);
tokens_helper(v, &mut node.lt_token.spans);
for el in Punctuated::pairs_mut(&mut node.args) {
let (it, p) = el.into_tuple();
v.visit_generic_method_argument_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
tokens_helper(v, &mut node.gt_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_nested_meta_mut<V>(v: &mut V, node: &mut NestedMeta)
where
V: VisitMut + ?Sized,
{
match node {
NestedMeta::Meta(_binding_0) => {
v.visit_meta_mut(_binding_0);
}
NestedMeta::Lit(_binding_0) => {
v.visit_lit_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_parenthesized_generic_arguments_mut<V>(
v: &mut V,
node: &mut ParenthesizedGenericArguments,
)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.inputs) {
let (it, p) = el.into_tuple();
v.visit_type_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
v.visit_return_type_mut(&mut node.output);
}
#[cfg(feature = "full")]
pub fn visit_pat_mut<V>(v: &mut V, node: &mut Pat)
where
V: VisitMut + ?Sized,
{
match node {
Pat::Box(_binding_0) => {
v.visit_pat_box_mut(_binding_0);
}
Pat::Ident(_binding_0) => {
v.visit_pat_ident_mut(_binding_0);
}
Pat::Lit(_binding_0) => {
v.visit_pat_lit_mut(_binding_0);
}
Pat::Macro(_binding_0) => {
v.visit_pat_macro_mut(_binding_0);
}
Pat::Or(_binding_0) => {
v.visit_pat_or_mut(_binding_0);
}
Pat::Path(_binding_0) => {
v.visit_pat_path_mut(_binding_0);
}
Pat::Range(_binding_0) => {
v.visit_pat_range_mut(_binding_0);
}
Pat::Reference(_binding_0) => {
v.visit_pat_reference_mut(_binding_0);
}
Pat::Rest(_binding_0) => {
v.visit_pat_rest_mut(_binding_0);
}
Pat::Slice(_binding_0) => {
v.visit_pat_slice_mut(_binding_0);
}
Pat::Struct(_binding_0) => {
v.visit_pat_struct_mut(_binding_0);
}
Pat::Tuple(_binding_0) => {
v.visit_pat_tuple_mut(_binding_0);
}
Pat::TupleStruct(_binding_0) => {
v.visit_pat_tuple_struct_mut(_binding_0);
}
Pat::Type(_binding_0) => {
v.visit_pat_type_mut(_binding_0);
}
Pat::Verbatim(_binding_0) => {
skip!(_binding_0);
}
Pat::Wild(_binding_0) => {
v.visit_pat_wild_mut(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_pat_box_mut<V>(v: &mut V, node: &mut PatBox)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.box_token.span);
v.visit_pat_mut(&mut *node.pat);
}
#[cfg(feature = "full")]
pub fn visit_pat_ident_mut<V>(v: &mut V, node: &mut PatIdent)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.by_ref {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
v.visit_ident_mut(&mut node.ident);
if let Some(it) = &mut node.subpat {
tokens_helper(v, &mut (it).0.spans);
v.visit_pat_mut(&mut *(it).1);
}
}
#[cfg(feature = "full")]
pub fn visit_pat_lit_mut<V>(v: &mut V, node: &mut PatLit)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.expr);
}
#[cfg(feature = "full")]
pub fn visit_pat_macro_mut<V>(v: &mut V, node: &mut PatMacro)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_macro_mut(&mut node.mac);
}
#[cfg(feature = "full")]
pub fn visit_pat_or_mut<V>(v: &mut V, node: &mut PatOr)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.leading_vert {
tokens_helper(v, &mut it.spans);
}
for el in Punctuated::pairs_mut(&mut node.cases) {
let (it, p) = el.into_tuple();
v.visit_pat_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_pat_path_mut<V>(v: &mut V, node: &mut PatPath)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.qself {
v.visit_qself_mut(it);
}
v.visit_path_mut(&mut node.path);
}
#[cfg(feature = "full")]
pub fn visit_pat_range_mut<V>(v: &mut V, node: &mut PatRange)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_expr_mut(&mut *node.lo);
v.visit_range_limits_mut(&mut node.limits);
v.visit_expr_mut(&mut *node.hi);
}
#[cfg(feature = "full")]
pub fn visit_pat_reference_mut<V>(v: &mut V, node: &mut PatReference)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.and_token.spans);
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
v.visit_pat_mut(&mut *node.pat);
}
#[cfg(feature = "full")]
pub fn visit_pat_rest_mut<V>(v: &mut V, node: &mut PatRest)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.dot2_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_pat_slice_mut<V>(v: &mut V, node: &mut PatSlice)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.bracket_token.span);
for el in Punctuated::pairs_mut(&mut node.elems) {
let (it, p) = el.into_tuple();
v.visit_pat_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_pat_struct_mut<V>(v: &mut V, node: &mut PatStruct)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_path_mut(&mut node.path);
tokens_helper(v, &mut node.brace_token.span);
for el in Punctuated::pairs_mut(&mut node.fields) {
let (it, p) = el.into_tuple();
v.visit_field_pat_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
if let Some(it) = &mut node.dot2_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_pat_tuple_mut<V>(v: &mut V, node: &mut PatTuple)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.elems) {
let (it, p) = el.into_tuple();
v.visit_pat_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_pat_tuple_struct_mut<V>(v: &mut V, node: &mut PatTupleStruct)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_path_mut(&mut node.path);
v.visit_pat_tuple_mut(&mut node.pat);
}
#[cfg(feature = "full")]
pub fn visit_pat_type_mut<V>(v: &mut V, node: &mut PatType)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_pat_mut(&mut *node.pat);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut *node.ty);
}
#[cfg(feature = "full")]
pub fn visit_pat_wild_mut<V>(v: &mut V, node: &mut PatWild)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.underscore_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_path_mut<V>(v: &mut V, node: &mut Path)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.leading_colon {
tokens_helper(v, &mut it.spans);
}
for el in Punctuated::pairs_mut(&mut node.segments) {
let (it, p) = el.into_tuple();
v.visit_path_segment_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_path_arguments_mut<V>(v: &mut V, node: &mut PathArguments)
where
V: VisitMut + ?Sized,
{
match node {
PathArguments::None => {}
PathArguments::AngleBracketed(_binding_0) => {
v.visit_angle_bracketed_generic_arguments_mut(_binding_0);
}
PathArguments::Parenthesized(_binding_0) => {
v.visit_parenthesized_generic_arguments_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_path_segment_mut<V>(v: &mut V, node: &mut PathSegment)
where
V: VisitMut + ?Sized,
{
v.visit_ident_mut(&mut node.ident);
v.visit_path_arguments_mut(&mut node.arguments);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_predicate_eq_mut<V>(v: &mut V, node: &mut PredicateEq)
where
V: VisitMut + ?Sized,
{
v.visit_type_mut(&mut node.lhs_ty);
tokens_helper(v, &mut node.eq_token.spans);
v.visit_type_mut(&mut node.rhs_ty);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_predicate_lifetime_mut<V>(v: &mut V, node: &mut PredicateLifetime)
where
V: VisitMut + ?Sized,
{
v.visit_lifetime_mut(&mut node.lifetime);
tokens_helper(v, &mut node.colon_token.spans);
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_lifetime_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_predicate_type_mut<V>(v: &mut V, node: &mut PredicateType)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.lifetimes {
v.visit_bound_lifetimes_mut(it);
}
v.visit_type_mut(&mut node.bounded_ty);
tokens_helper(v, &mut node.colon_token.spans);
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_qself_mut<V>(v: &mut V, node: &mut QSelf)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.lt_token.spans);
v.visit_type_mut(&mut *node.ty);
skip!(node.position);
if let Some(it) = &mut node.as_token {
tokens_helper(v, &mut it.span);
}
tokens_helper(v, &mut node.gt_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_range_limits_mut<V>(v: &mut V, node: &mut RangeLimits)
where
V: VisitMut + ?Sized,
{
match node {
RangeLimits::HalfOpen(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
RangeLimits::Closed(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_receiver_mut<V>(v: &mut V, node: &mut Receiver)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
if let Some(it) = &mut node.reference {
tokens_helper(v, &mut (it).0.spans);
if let Some(it) = &mut (it).1 {
v.visit_lifetime_mut(it);
}
}
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
tokens_helper(v, &mut node.self_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_return_type_mut<V>(v: &mut V, node: &mut ReturnType)
where
V: VisitMut + ?Sized,
{
match node {
ReturnType::Default => {}
ReturnType::Type(_binding_0, _binding_1) => {
tokens_helper(v, &mut _binding_0.spans);
v.visit_type_mut(&mut **_binding_1);
}
}
}
#[cfg(feature = "full")]
pub fn visit_signature_mut<V>(v: &mut V, node: &mut Signature)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.constness {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.asyncness {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.unsafety {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.abi {
v.visit_abi_mut(it);
}
tokens_helper(v, &mut node.fn_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.inputs) {
let (it, p) = el.into_tuple();
v.visit_fn_arg_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
if let Some(it) = &mut node.variadic {
v.visit_variadic_mut(it);
}
v.visit_return_type_mut(&mut node.output);
}
pub fn visit_span_mut<V>(v: &mut V, node: &mut Span)
where
V: VisitMut + ?Sized,
{}
#[cfg(feature = "full")]
pub fn visit_stmt_mut<V>(v: &mut V, node: &mut Stmt)
where
V: VisitMut + ?Sized,
{
match node {
Stmt::Local(_binding_0) => {
v.visit_local_mut(_binding_0);
}
Stmt::Item(_binding_0) => {
v.visit_item_mut(_binding_0);
}
Stmt::Expr(_binding_0) => {
v.visit_expr_mut(_binding_0);
}
Stmt::Semi(_binding_0, _binding_1) => {
v.visit_expr_mut(_binding_0);
tokens_helper(v, &mut _binding_1.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_trait_bound_mut<V>(v: &mut V, node: &mut TraitBound)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.paren_token {
tokens_helper(v, &mut it.span);
}
v.visit_trait_bound_modifier_mut(&mut node.modifier);
if let Some(it) = &mut node.lifetimes {
v.visit_bound_lifetimes_mut(it);
}
v.visit_path_mut(&mut node.path);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_trait_bound_modifier_mut<V>(v: &mut V, node: &mut TraitBoundModifier)
where
V: VisitMut + ?Sized,
{
match node {
TraitBoundModifier::None => {}
TraitBoundModifier::Maybe(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item_mut<V>(v: &mut V, node: &mut TraitItem)
where
V: VisitMut + ?Sized,
{
match node {
TraitItem::Const(_binding_0) => {
v.visit_trait_item_const_mut(_binding_0);
}
TraitItem::Method(_binding_0) => {
v.visit_trait_item_method_mut(_binding_0);
}
TraitItem::Type(_binding_0) => {
v.visit_trait_item_type_mut(_binding_0);
}
TraitItem::Macro(_binding_0) => {
v.visit_trait_item_macro_mut(_binding_0);
}
TraitItem::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item_const_mut<V>(v: &mut V, node: &mut TraitItemConst)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.const_token.span);
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon_token.spans);
v.visit_type_mut(&mut node.ty);
if let Some(it) = &mut node.default {
tokens_helper(v, &mut (it).0.spans);
v.visit_expr_mut(&mut (it).1);
}
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_trait_item_macro_mut<V>(v: &mut V, node: &mut TraitItemMacro)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_macro_mut(&mut node.mac);
if let Some(it) = &mut node.semi_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item_method_mut<V>(v: &mut V, node: &mut TraitItemMethod)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_signature_mut(&mut node.sig);
if let Some(it) = &mut node.default {
v.visit_block_mut(it);
}
if let Some(it) = &mut node.semi_token {
tokens_helper(v, &mut it.spans);
}
}
#[cfg(feature = "full")]
pub fn visit_trait_item_type_mut<V>(v: &mut V, node: &mut TraitItemType)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.type_token.span);
v.visit_ident_mut(&mut node.ident);
v.visit_generics_mut(&mut node.generics);
if let Some(it) = &mut node.colon_token {
tokens_helper(v, &mut it.spans);
}
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
if let Some(it) = &mut node.default {
tokens_helper(v, &mut (it).0.spans);
v.visit_type_mut(&mut (it).1);
}
tokens_helper(v, &mut node.semi_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_mut<V>(v: &mut V, node: &mut Type)
where
V: VisitMut + ?Sized,
{
match node {
Type::Array(_binding_0) => {
v.visit_type_array_mut(_binding_0);
}
Type::BareFn(_binding_0) => {
v.visit_type_bare_fn_mut(_binding_0);
}
Type::Group(_binding_0) => {
v.visit_type_group_mut(_binding_0);
}
Type::ImplTrait(_binding_0) => {
v.visit_type_impl_trait_mut(_binding_0);
}
Type::Infer(_binding_0) => {
v.visit_type_infer_mut(_binding_0);
}
Type::Macro(_binding_0) => {
v.visit_type_macro_mut(_binding_0);
}
Type::Never(_binding_0) => {
v.visit_type_never_mut(_binding_0);
}
Type::Paren(_binding_0) => {
v.visit_type_paren_mut(_binding_0);
}
Type::Path(_binding_0) => {
v.visit_type_path_mut(_binding_0);
}
Type::Ptr(_binding_0) => {
v.visit_type_ptr_mut(_binding_0);
}
Type::Reference(_binding_0) => {
v.visit_type_reference_mut(_binding_0);
}
Type::Slice(_binding_0) => {
v.visit_type_slice_mut(_binding_0);
}
Type::TraitObject(_binding_0) => {
v.visit_type_trait_object_mut(_binding_0);
}
Type::Tuple(_binding_0) => {
v.visit_type_tuple_mut(_binding_0);
}
Type::Verbatim(_binding_0) => {
skip!(_binding_0);
}
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_array_mut<V>(v: &mut V, node: &mut TypeArray)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.bracket_token.span);
v.visit_type_mut(&mut *node.elem);
tokens_helper(v, &mut node.semi_token.spans);
v.visit_expr_mut(&mut node.len);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_bare_fn_mut<V>(v: &mut V, node: &mut TypeBareFn)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.lifetimes {
v.visit_bound_lifetimes_mut(it);
}
if let Some(it) = &mut node.unsafety {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.abi {
v.visit_abi_mut(it);
}
tokens_helper(v, &mut node.fn_token.span);
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.inputs) {
let (it, p) = el.into_tuple();
v.visit_bare_fn_arg_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
if let Some(it) = &mut node.variadic {
v.visit_variadic_mut(it);
}
v.visit_return_type_mut(&mut node.output);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_group_mut<V>(v: &mut V, node: &mut TypeGroup)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.group_token.span);
v.visit_type_mut(&mut *node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_impl_trait_mut<V>(v: &mut V, node: &mut TypeImplTrait)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.impl_token.span);
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_infer_mut<V>(v: &mut V, node: &mut TypeInfer)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.underscore_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_macro_mut<V>(v: &mut V, node: &mut TypeMacro)
where
V: VisitMut + ?Sized,
{
v.visit_macro_mut(&mut node.mac);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_never_mut<V>(v: &mut V, node: &mut TypeNever)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.bang_token.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_param_mut<V>(v: &mut V, node: &mut TypeParam)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_ident_mut(&mut node.ident);
if let Some(it) = &mut node.colon_token {
tokens_helper(v, &mut it.spans);
}
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
if let Some(it) = &mut node.eq_token {
tokens_helper(v, &mut it.spans);
}
if let Some(it) = &mut node.default {
v.visit_type_mut(it);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_param_bound_mut<V>(v: &mut V, node: &mut TypeParamBound)
where
V: VisitMut + ?Sized,
{
match node {
TypeParamBound::Trait(_binding_0) => {
v.visit_trait_bound_mut(_binding_0);
}
TypeParamBound::Lifetime(_binding_0) => {
v.visit_lifetime_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_paren_mut<V>(v: &mut V, node: &mut TypeParen)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.paren_token.span);
v.visit_type_mut(&mut *node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_path_mut<V>(v: &mut V, node: &mut TypePath)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.qself {
v.visit_qself_mut(it);
}
v.visit_path_mut(&mut node.path);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_ptr_mut<V>(v: &mut V, node: &mut TypePtr)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.star_token.spans);
if let Some(it) = &mut node.const_token {
tokens_helper(v, &mut it.span);
}
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
v.visit_type_mut(&mut *node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_reference_mut<V>(v: &mut V, node: &mut TypeReference)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.and_token.spans);
if let Some(it) = &mut node.lifetime {
v.visit_lifetime_mut(it);
}
if let Some(it) = &mut node.mutability {
tokens_helper(v, &mut it.span);
}
v.visit_type_mut(&mut *node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_slice_mut<V>(v: &mut V, node: &mut TypeSlice)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.bracket_token.span);
v.visit_type_mut(&mut *node.elem);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_trait_object_mut<V>(v: &mut V, node: &mut TypeTraitObject)
where
V: VisitMut + ?Sized,
{
if let Some(it) = &mut node.dyn_token {
tokens_helper(v, &mut it.span);
}
for el in Punctuated::pairs_mut(&mut node.bounds) {
let (it, p) = el.into_tuple();
v.visit_type_param_bound_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_type_tuple_mut<V>(v: &mut V, node: &mut TypeTuple)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.paren_token.span);
for el in Punctuated::pairs_mut(&mut node.elems) {
let (it, p) = el.into_tuple();
v.visit_type_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_un_op_mut<V>(v: &mut V, node: &mut UnOp)
where
V: VisitMut + ?Sized,
{
match node {
UnOp::Deref(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
UnOp::Not(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
UnOp::Neg(_binding_0) => {
tokens_helper(v, &mut _binding_0.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_use_glob_mut<V>(v: &mut V, node: &mut UseGlob)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.star_token.spans);
}
#[cfg(feature = "full")]
pub fn visit_use_group_mut<V>(v: &mut V, node: &mut UseGroup)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.brace_token.span);
for el in Punctuated::pairs_mut(&mut node.items) {
let (it, p) = el.into_tuple();
v.visit_use_tree_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}
#[cfg(feature = "full")]
pub fn visit_use_name_mut<V>(v: &mut V, node: &mut UseName)
where
V: VisitMut + ?Sized,
{
v.visit_ident_mut(&mut node.ident);
}
#[cfg(feature = "full")]
pub fn visit_use_path_mut<V>(v: &mut V, node: &mut UsePath)
where
V: VisitMut + ?Sized,
{
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.colon2_token.spans);
v.visit_use_tree_mut(&mut *node.tree);
}
#[cfg(feature = "full")]
pub fn visit_use_rename_mut<V>(v: &mut V, node: &mut UseRename)
where
V: VisitMut + ?Sized,
{
v.visit_ident_mut(&mut node.ident);
tokens_helper(v, &mut node.as_token.span);
v.visit_ident_mut(&mut node.rename);
}
#[cfg(feature = "full")]
pub fn visit_use_tree_mut<V>(v: &mut V, node: &mut UseTree)
where
V: VisitMut + ?Sized,
{
match node {
UseTree::Path(_binding_0) => {
v.visit_use_path_mut(_binding_0);
}
UseTree::Name(_binding_0) => {
v.visit_use_name_mut(_binding_0);
}
UseTree::Rename(_binding_0) => {
v.visit_use_rename_mut(_binding_0);
}
UseTree::Glob(_binding_0) => {
v.visit_use_glob_mut(_binding_0);
}
UseTree::Group(_binding_0) => {
v.visit_use_group_mut(_binding_0);
}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_variadic_mut<V>(v: &mut V, node: &mut Variadic)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
tokens_helper(v, &mut node.dots.spans);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_variant_mut<V>(v: &mut V, node: &mut Variant)
where
V: VisitMut + ?Sized,
{
for it in &mut node.attrs {
v.visit_attribute_mut(it);
}
v.visit_ident_mut(&mut node.ident);
v.visit_fields_mut(&mut node.fields);
if let Some(it) = &mut node.discriminant {
tokens_helper(v, &mut (it).0.spans);
v.visit_expr_mut(&mut (it).1);
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_vis_crate_mut<V>(v: &mut V, node: &mut VisCrate)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.crate_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_vis_public_mut<V>(v: &mut V, node: &mut VisPublic)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.pub_token.span);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_vis_restricted_mut<V>(v: &mut V, node: &mut VisRestricted)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.pub_token.span);
tokens_helper(v, &mut node.paren_token.span);
if let Some(it) = &mut node.in_token {
tokens_helper(v, &mut it.span);
}
v.visit_path_mut(&mut *node.path);
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_visibility_mut<V>(v: &mut V, node: &mut Visibility)
where
V: VisitMut + ?Sized,
{
match node {
Visibility::Public(_binding_0) => {
v.visit_vis_public_mut(_binding_0);
}
Visibility::Crate(_binding_0) => {
v.visit_vis_crate_mut(_binding_0);
}
Visibility::Restricted(_binding_0) => {
v.visit_vis_restricted_mut(_binding_0);
}
Visibility::Inherited => {}
}
}
#[cfg(any(feature = "derive", feature = "full"))]
pub fn visit_where_clause_mut<V>(v: &mut V, node: &mut WhereClause)
where
V: VisitMut + ?Sized,
{
tokens_helper(v, &mut node.where_token.span);
for el in Punctuated::pairs_mut(&mut node.predicates) {
let (it, p) = el.into_tuple();
v.visit_where_predicate_mut(it);
if let Some(p) = p {
tokens_helper(v, &mut p.spans);
}
}
}More examples
src/generics.rs (line 891)
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fn parse(input: ParseStream) -> Result<Self> {
#[cfg(feature = "full")]
let tilde_const = if input.peek(Token![~]) && input.peek2(Token![const]) {
let tilde_token = input.parse::<Token![~]>()?;
let const_token = input.parse::<Token![const]>()?;
Some((tilde_token, const_token))
} else {
None
};
let modifier: TraitBoundModifier = input.parse()?;
let lifetimes: Option<BoundLifetimes> = input.parse()?;
let mut path: Path = input.parse()?;
if path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
}
#[cfg(feature = "full")]
{
if let Some((tilde_token, const_token)) = tilde_const {
path.segments.insert(
0,
PathSegment {
ident: Ident::new("const", const_token.span),
arguments: PathArguments::None,
},
);
let (_const, punct) = path.segments.pairs_mut().next().unwrap().into_tuple();
*punct.unwrap() = Token;
}
}
Ok(TraitBound {
paren_token: None,
modifier,
lifetimes,
path,
})
}sourcepub fn into_pairs(self) -> IntoPairs<T, P> ⓘ
pub fn into_pairs(self) -> IntoPairs<T, P> ⓘ
Returns an iterator over the contents of this sequence as owned punctuated pairs.
Examples found in repository?
More examples
src/path.rs (line 659)
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pub fn qpath(input: ParseStream, expr_style: bool) -> Result<(Option<QSelf>, Path)> {
if input.peek(Token![<]) {
let lt_token: Token![<] = input.parse()?;
let this: Type = input.parse()?;
let path = if input.peek(Token![as]) {
let as_token: Token![as] = input.parse()?;
let path: Path = input.parse()?;
Some((as_token, path))
} else {
None
};
let gt_token: Token![>] = input.parse()?;
let colon2_token: Token![::] = input.parse()?;
let mut rest = Punctuated::new();
loop {
let path = PathSegment::parse_helper(input, expr_style)?;
rest.push_value(path);
if !input.peek(Token![::]) {
break;
}
let punct: Token![::] = input.parse()?;
rest.push_punct(punct);
}
let (position, as_token, path) = match path {
Some((as_token, mut path)) => {
let pos = path.segments.len();
path.segments.push_punct(colon2_token);
path.segments.extend(rest.into_pairs());
(pos, Some(as_token), path)
}
None => {
let path = Path {
leading_colon: Some(colon2_token),
segments: rest,
};
(0, None, path)
}
};
let qself = QSelf {
lt_token,
ty: Box::new(this),
position,
as_token,
gt_token,
};
Ok((Some(qself), path))
} else {
let path = Path::parse_helper(input, expr_style)?;
Ok((None, path))
}
}sourcepub fn push_value(&mut self, value: T)
pub fn push_value(&mut self, value: T)
Appends a syntax tree node onto the end of this punctuated sequence. The sequence must previously have a trailing punctuation.
Use push instead if the punctuated sequence may or may not already
have trailing punctuation.
Panics
Panics if the sequence does not already have a trailing punctuation when this method is called.
Examples found in repository?
src/punctuated.rs (line 227)
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pub fn push(&mut self, value: T)
where
P: Default,
{
if !self.empty_or_trailing() {
self.push_punct(Default::default());
}
self.push_value(value);
}
/// Inserts an element at position `index`.
///
/// # Panics
///
/// Panics if `index` is greater than the number of elements previously in
/// this punctuated sequence.
pub fn insert(&mut self, index: usize, value: T)
where
P: Default,
{
assert!(
index <= self.len(),
"Punctuated::insert: index out of range",
);
if index == self.len() {
self.push(value);
} else {
self.inner.insert(index, (value, Default::default()));
}
}
/// Clears the sequence of all values and punctuation, making it empty.
pub fn clear(&mut self) {
self.inner.clear();
self.last = None;
}
/// Parses zero or more occurrences of `T` separated by punctuation of type
/// `P`, with optional trailing punctuation.
///
/// Parsing continues until the end of this parse stream. The entire content
/// of this parse stream must consist of `T` and `P`.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Parse,
{
Self::parse_terminated_with(input, T::parse)
}
/// Parses zero or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, with optional trailing
/// punctuation.
///
/// Like [`parse_terminated`], the entire content of this stream is expected
/// to be parsed.
///
/// [`parse_terminated`]: Punctuated::parse_terminated
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}More examples
src/path.rs (line 25)
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fn from(segment: T) -> Self {
let mut path = Path {
leading_colon: None,
segments: Punctuated::new(),
};
path.segments.push_value(segment.into());
path
}
}
ast_struct! {
/// A segment of a path together with any path arguments on that segment.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct PathSegment {
pub ident: Ident,
pub arguments: PathArguments,
}
}
impl<T> From<T> for PathSegment
where
T: Into<Ident>,
{
fn from(ident: T) -> Self {
PathSegment {
ident: ident.into(),
arguments: PathArguments::None,
}
}
}
ast_enum! {
/// Angle bracketed or parenthesized arguments of a path segment.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
///
/// ## Angle bracketed
///
/// The `<'a, T>` in `std::slice::iter<'a, T>`.
///
/// ## Parenthesized
///
/// The `(A, B) -> C` in `Fn(A, B) -> C`.
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum PathArguments {
None,
/// The `<'a, T>` in `std::slice::iter<'a, T>`.
AngleBracketed(AngleBracketedGenericArguments),
/// The `(A, B) -> C` in `Fn(A, B) -> C`.
Parenthesized(ParenthesizedGenericArguments),
}
}
impl Default for PathArguments {
fn default() -> Self {
PathArguments::None
}
}
impl PathArguments {
pub fn is_empty(&self) -> bool {
match self {
PathArguments::None => true,
PathArguments::AngleBracketed(bracketed) => bracketed.args.is_empty(),
PathArguments::Parenthesized(_) => false,
}
}
pub fn is_none(&self) -> bool {
match self {
PathArguments::None => true,
PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => false,
}
}
}
ast_enum! {
/// An individual generic argument, like `'a`, `T`, or `Item = T`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub enum GenericArgument {
/// A lifetime argument.
Lifetime(Lifetime),
/// A type argument.
Type(Type),
/// A const expression. Must be inside of a block.
///
/// NOTE: Identity expressions are represented as Type arguments, as
/// they are indistinguishable syntactically.
Const(Expr),
/// A binding (equality constraint) on an associated type: the `Item =
/// u8` in `Iterator<Item = u8>`.
Binding(Binding),
/// An associated type bound: `Iterator<Item: Display>`.
Constraint(Constraint),
}
}
ast_struct! {
/// Angle bracketed arguments of a path segment: the `<K, V>` in `HashMap<K,
/// V>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct AngleBracketedGenericArguments {
pub colon2_token: Option<Token![::]>,
pub lt_token: Token![<],
pub args: Punctuated<GenericArgument, Token![,]>,
pub gt_token: Token![>],
}
}
ast_struct! {
/// A binding (equality constraint) on an associated type: `Item = u8`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct Binding {
pub ident: Ident,
pub eq_token: Token![=],
pub ty: Type,
}
}
ast_struct! {
/// An associated type bound: `Iterator<Item: Display>`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct Constraint {
pub ident: Ident,
pub colon_token: Token![:],
pub bounds: Punctuated<TypeParamBound, Token![+]>,
}
}
ast_struct! {
/// Arguments of a function path segment: the `(A, B) -> C` in `Fn(A,B) ->
/// C`.
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct ParenthesizedGenericArguments {
pub paren_token: token::Paren,
/// `(A, B)`
pub inputs: Punctuated<Type, Token![,]>,
/// `C`
pub output: ReturnType,
}
}
ast_struct! {
/// The explicit Self type in a qualified path: the `T` in `<T as
/// Display>::fmt`.
///
/// The actual path, including the trait and the associated item, is stored
/// separately. The `position` field represents the index of the associated
/// item qualified with this Self type.
///
/// ```text
/// <Vec<T> as a::b::Trait>::AssociatedItem
/// ^~~~~~ ~~~~~~~~~~~~~~^
/// ty position = 3
///
/// <Vec<T>>::AssociatedItem
/// ^~~~~~ ^
/// ty position = 0
/// ```
///
/// *This type is available only if Syn is built with the `"derive"` or `"full"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
pub struct QSelf {
pub lt_token: Token![<],
pub ty: Box<Type>,
pub position: usize,
pub as_token: Option<Token![as]>,
pub gt_token: Token![>],
}
}
#[cfg(feature = "parsing")]
pub mod parsing {
use super::*;
use crate::ext::IdentExt;
use crate::parse::{Parse, ParseStream, Result};
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Path {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericArgument {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) && !input.peek2(Token![+]) {
return Ok(GenericArgument::Lifetime(input.parse()?));
}
if input.peek(Ident) && input.peek2(Token![=]) {
let ident: Ident = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let ty = if input.peek(Lit) {
let begin = input.fork();
input.parse::<Lit>()?;
Type::Verbatim(verbatim::between(begin, input))
} else if input.peek(token::Brace) {
let begin = input.fork();
#[cfg(feature = "full")]
{
input.parse::<ExprBlock>()?;
}
#[cfg(not(feature = "full"))]
{
let content;
braced!(content in input);
content.parse::<Expr>()?;
}
Type::Verbatim(verbatim::between(begin, input))
} else {
input.parse()?
};
return Ok(GenericArgument::Binding(Binding {
ident,
eq_token,
ty,
}));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) && input.peek2(Token![:]) && !input.peek2(Token![::]) {
return Ok(GenericArgument::Constraint(input.parse()?));
}
}
if input.peek(Lit) || input.peek(token::Brace) {
return const_argument(input).map(GenericArgument::Const);
}
#[cfg(feature = "full")]
let begin = input.fork();
let argument: Type = input.parse()?;
#[cfg(feature = "full")]
{
if match &argument {
Type::Path(argument)
if argument.qself.is_none()
&& argument.path.leading_colon.is_none()
&& argument.path.segments.len() == 1 =>
{
match argument.path.segments[0].arguments {
PathArguments::AngleBracketed(_) => true,
_ => false,
}
}
_ => false,
} && if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
input.parse::<Type>()?;
true
} else if input.peek(Token![:]) {
input.parse::<Token![:]>()?;
input.call(constraint_bounds)?;
true
} else {
false
} {
let verbatim = verbatim::between(begin, input);
return Ok(GenericArgument::Type(Type::Verbatim(verbatim)));
}
}
Ok(GenericArgument::Type(argument))
}
}
pub fn const_argument(input: ParseStream) -> Result<Expr> {
let lookahead = input.lookahead1();
if input.peek(Lit) {
let lit = input.parse()?;
return Ok(Expr::Lit(lit));
}
#[cfg(feature = "full")]
{
if input.peek(Ident) {
let ident: Ident = input.parse()?;
return Ok(Expr::Path(ExprPath {
attrs: Vec::new(),
qself: None,
path: Path::from(ident),
}));
}
}
if input.peek(token::Brace) {
#[cfg(feature = "full")]
{
let block: ExprBlock = input.parse()?;
return Ok(Expr::Block(block));
}
#[cfg(not(feature = "full"))]
{
let begin = input.fork();
let content;
braced!(content in input);
content.parse::<Expr>()?;
let verbatim = verbatim::between(begin, input);
return Ok(Expr::Verbatim(verbatim));
}
}
Err(lookahead.error())
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for AngleBracketedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
Ok(AngleBracketedGenericArguments {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ParenthesizedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ParenthesizedGenericArguments {
paren_token: parenthesized!(content in input),
inputs: content.parse_terminated(Type::parse)?,
output: input.call(ReturnType::without_plus)?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for PathSegment {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
impl PathSegment {
fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
if input.peek(Token![super]) || input.peek(Token![self]) || input.peek(Token![crate]) {
let ident = input.call(Ident::parse_any)?;
return Ok(PathSegment::from(ident));
}
let ident = if input.peek(Token![Self]) {
input.call(Ident::parse_any)?
} else {
input.parse()?
};
if !expr_style && input.peek(Token![<]) && !input.peek(Token![<=])
|| input.peek(Token![::]) && input.peek3(Token![<])
{
Ok(PathSegment {
ident,
arguments: PathArguments::AngleBracketed(input.parse()?),
})
} else {
Ok(PathSegment::from(ident))
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Binding {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Binding {
ident: input.parse()?,
eq_token: input.parse()?,
ty: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Constraint {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Constraint {
ident: input.parse()?,
colon_token: input.parse()?,
bounds: constraint_bounds(input)?,
})
}
}
#[cfg(feature = "full")]
fn constraint_bounds(input: ParseStream) -> Result<Punctuated<TypeParamBound, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
Ok(bounds)
}
impl Path {
/// Parse a `Path` containing no path arguments on any of its segments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Path, Result, Token};
/// use syn::parse::{Parse, ParseStream};
///
/// // A simplified single `use` statement like:
/// //
/// // use std::collections::HashMap;
/// //
/// // Note that generic parameters are not allowed in a `use` statement
/// // so the following must not be accepted.
/// //
/// // use a::<b>::c;
/// struct SingleUse {
/// use_token: Token![use],
/// path: Path,
/// }
///
/// impl Parse for SingleUse {
/// fn parse(input: ParseStream) -> Result<Self> {
/// Ok(SingleUse {
/// use_token: input.parse()?,
/// path: input.call(Path::parse_mod_style)?,
/// })
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_mod_style(input: ParseStream) -> Result<Self> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
loop {
if !input.peek(Ident)
&& !input.peek(Token![super])
&& !input.peek(Token![self])
&& !input.peek(Token![Self])
&& !input.peek(Token![crate])
{
break;
}
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}
/// Determines whether this is a path of length 1 equal to the given
/// ident.
///
/// For them to compare equal, it must be the case that:
///
/// - the path has no leading colon,
/// - the number of path segments is 1,
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments, and
/// - the ident of the first path segment is equal to the given one.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Attribute, Error, Meta, NestedMeta, Result};
/// # use std::iter::FromIterator;
///
/// fn get_serde_meta_items(attr: &Attribute) -> Result<Vec<NestedMeta>> {
/// if attr.path.is_ident("serde") {
/// match attr.parse_meta()? {
/// Meta::List(meta) => Ok(Vec::from_iter(meta.nested)),
/// bad => Err(Error::new_spanned(bad, "unrecognized attribute")),
/// }
/// } else {
/// Ok(Vec::new())
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn is_ident<I: ?Sized>(&self, ident: &I) -> bool
where
Ident: PartialEq<I>,
{
match self.get_ident() {
Some(id) => id == ident,
None => false,
}
}
/// If this path consists of a single ident, returns the ident.
///
/// A path is considered an ident if:
///
/// - the path has no leading colon,
/// - the number of path segments is 1, and
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn get_ident(&self) -> Option<&Ident> {
if self.leading_colon.is_none()
&& self.segments.len() == 1
&& self.segments[0].arguments.is_none()
{
Some(&self.segments[0].ident)
} else {
None
}
}
pub(crate) fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
let mut path = Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
let value = PathSegment::parse_helper(input, expr_style)?;
segments.push_value(value);
segments
},
};
Path::parse_rest(input, &mut path, expr_style)?;
Ok(path)
}
pub(crate) fn parse_rest(
input: ParseStream,
path: &mut Self,
expr_style: bool,
) -> Result<()> {
while input.peek(Token![::]) && !input.peek3(token::Paren) {
let punct: Token![::] = input.parse()?;
path.segments.push_punct(punct);
let value = PathSegment::parse_helper(input, expr_style)?;
path.segments.push_value(value);
}
Ok(())
}
}
pub fn qpath(input: ParseStream, expr_style: bool) -> Result<(Option<QSelf>, Path)> {
if input.peek(Token![<]) {
let lt_token: Token![<] = input.parse()?;
let this: Type = input.parse()?;
let path = if input.peek(Token![as]) {
let as_token: Token![as] = input.parse()?;
let path: Path = input.parse()?;
Some((as_token, path))
} else {
None
};
let gt_token: Token![>] = input.parse()?;
let colon2_token: Token![::] = input.parse()?;
let mut rest = Punctuated::new();
loop {
let path = PathSegment::parse_helper(input, expr_style)?;
rest.push_value(path);
if !input.peek(Token![::]) {
break;
}
let punct: Token![::] = input.parse()?;
rest.push_punct(punct);
}
let (position, as_token, path) = match path {
Some((as_token, mut path)) => {
let pos = path.segments.len();
path.segments.push_punct(colon2_token);
path.segments.extend(rest.into_pairs());
(pos, Some(as_token), path)
}
None => {
let path = Path {
leading_colon: Some(colon2_token),
segments: rest,
};
(0, None, path)
}
};
let qself = QSelf {
lt_token,
ty: Box::new(this),
position,
as_token,
gt_token,
};
Ok((Some(qself), path))
} else {
let path = Path::parse_helper(input, expr_style)?;
Ok((None, path))
}
}src/attr.rs (line 540)
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fn parse_meta_path(input: ParseStream) -> Result<Path> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
while input.peek(Ident::peek_any) {
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}src/pat.rs (line 485)
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fn pat_struct(begin: ParseBuffer, input: ParseStream, path: Path) -> Result<Pat> {
let content;
let brace_token = braced!(content in input);
let mut fields = Punctuated::new();
let mut dot2_token = None;
while !content.is_empty() {
let attrs = content.call(Attribute::parse_outer)?;
if content.peek(Token![..]) {
dot2_token = Some(content.parse()?);
if !attrs.is_empty() {
return Ok(Pat::Verbatim(verbatim::between(begin, input)));
}
break;
}
let mut value = content.call(field_pat)?;
value.attrs = attrs;
fields.push_value(value);
if content.is_empty() {
break;
}
let punct: Token![,] = content.parse()?;
fields.push_punct(punct);
}
Ok(Pat::Struct(PatStruct {
attrs: Vec::new(),
path,
brace_token,
fields,
dot2_token,
}))
}
impl Member {
fn is_unnamed(&self) -> bool {
match *self {
Member::Named(_) => false,
Member::Unnamed(_) => true,
}
}
}
fn field_pat(input: ParseStream) -> Result<FieldPat> {
let boxed: Option<Token![box]> = input.parse()?;
let by_ref: Option<Token![ref]> = input.parse()?;
let mutability: Option<Token![mut]> = input.parse()?;
let member: Member = input.parse()?;
if boxed.is_none() && by_ref.is_none() && mutability.is_none() && input.peek(Token![:])
|| member.is_unnamed()
{
return Ok(FieldPat {
attrs: Vec::new(),
member,
colon_token: input.parse()?,
pat: Box::new(multi_pat_with_leading_vert(input)?),
});
}
let ident = match member {
Member::Named(ident) => ident,
Member::Unnamed(_) => unreachable!(),
};
let mut pat = Pat::Ident(PatIdent {
attrs: Vec::new(),
by_ref,
mutability,
ident: ident.clone(),
subpat: None,
});
if let Some(boxed) = boxed {
pat = Pat::Box(PatBox {
attrs: Vec::new(),
box_token: boxed,
pat: Box::new(pat),
});
}
Ok(FieldPat {
attrs: Vec::new(),
member: Member::Named(ident),
colon_token: None,
pat: Box::new(pat),
})
}
fn pat_range(
input: ParseStream,
begin: ParseBuffer,
qself: Option<QSelf>,
path: Path,
) -> Result<Pat> {
let limits: RangeLimits = input.parse()?;
let hi = input.call(pat_lit_expr)?;
if let Some(hi) = hi {
Ok(Pat::Range(PatRange {
attrs: Vec::new(),
lo: Box::new(Expr::Path(ExprPath {
attrs: Vec::new(),
qself,
path,
})),
limits,
hi,
}))
} else {
Ok(Pat::Verbatim(verbatim::between(begin, input)))
}
}
fn pat_range_half_open(input: ParseStream, begin: ParseBuffer) -> Result<Pat> {
let limits: RangeLimits = input.parse()?;
let hi = input.call(pat_lit_expr)?;
if hi.is_some() {
Ok(Pat::Verbatim(verbatim::between(begin, input)))
} else {
match limits {
RangeLimits::HalfOpen(dot2_token) => Ok(Pat::Rest(PatRest {
attrs: Vec::new(),
dot2_token,
})),
RangeLimits::Closed(_) => Err(input.error("expected range upper bound")),
}
}
}
fn pat_tuple(input: ParseStream) -> Result<PatTuple> {
let content;
let paren_token = parenthesized!(content in input);
let mut elems = Punctuated::new();
while !content.is_empty() {
let value = multi_pat_with_leading_vert(&content)?;
elems.push_value(value);
if content.is_empty() {
break;
}
let punct = content.parse()?;
elems.push_punct(punct);
}
Ok(PatTuple {
attrs: Vec::new(),
paren_token,
elems,
})
}
fn pat_reference(input: ParseStream) -> Result<PatReference> {
Ok(PatReference {
attrs: Vec::new(),
and_token: input.parse()?,
mutability: input.parse()?,
pat: input.parse()?,
})
}
fn pat_lit_or_range(input: ParseStream) -> Result<Pat> {
let begin = input.fork();
let lo = input.call(pat_lit_expr)?.unwrap();
if input.peek(Token![..]) {
let limits: RangeLimits = input.parse()?;
let hi = input.call(pat_lit_expr)?;
if let Some(hi) = hi {
Ok(Pat::Range(PatRange {
attrs: Vec::new(),
lo,
limits,
hi,
}))
} else {
Ok(Pat::Verbatim(verbatim::between(begin, input)))
}
} else if let Expr::Verbatim(verbatim) = *lo {
Ok(Pat::Verbatim(verbatim))
} else {
Ok(Pat::Lit(PatLit {
attrs: Vec::new(),
expr: lo,
}))
}
}
fn pat_lit_expr(input: ParseStream) -> Result<Option<Box<Expr>>> {
if input.is_empty()
|| input.peek(Token![|])
|| input.peek(Token![=])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![,])
|| input.peek(Token![;])
{
return Ok(None);
}
let neg: Option<Token![-]> = input.parse()?;
let lookahead = input.lookahead1();
let expr = if lookahead.peek(Lit) {
Expr::Lit(input.parse()?)
} else if lookahead.peek(Ident)
|| lookahead.peek(Token![::])
|| lookahead.peek(Token![<])
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![Self])
|| lookahead.peek(Token![super])
|| lookahead.peek(Token![crate])
{
Expr::Path(input.parse()?)
} else if lookahead.peek(Token![const]) {
Expr::Verbatim(input.call(expr::parsing::expr_const)?)
} else {
return Err(lookahead.error());
};
Ok(Some(Box::new(if let Some(neg) = neg {
Expr::Unary(ExprUnary {
attrs: Vec::new(),
op: UnOp::Neg(neg),
expr: Box::new(expr),
})
} else {
expr
})))
}
fn pat_slice(input: ParseStream) -> Result<PatSlice> {
let content;
let bracket_token = bracketed!(content in input);
let mut elems = Punctuated::new();
while !content.is_empty() {
let value = multi_pat_with_leading_vert(&content)?;
elems.push_value(value);
if content.is_empty() {
break;
}
let punct = content.parse()?;
elems.push_punct(punct);
}
Ok(PatSlice {
attrs: Vec::new(),
bracket_token,
elems,
})
}
fn pat_const(input: ParseStream) -> Result<TokenStream> {
let begin = input.fork();
input.parse::<Token![const]>()?;
let content;
braced!(content in input);
content.call(Attribute::parse_inner)?;
content.call(Block::parse_within)?;
Ok(verbatim::between(begin, input))
}
pub fn multi_pat(input: ParseStream) -> Result<Pat> {
multi_pat_impl(input, None)
}
pub fn multi_pat_with_leading_vert(input: ParseStream) -> Result<Pat> {
let leading_vert: Option<Token![|]> = input.parse()?;
multi_pat_impl(input, leading_vert)
}
fn multi_pat_impl(input: ParseStream, leading_vert: Option<Token![|]>) -> Result<Pat> {
let mut pat: Pat = input.parse()?;
if leading_vert.is_some()
|| input.peek(Token![|]) && !input.peek(Token![||]) && !input.peek(Token![|=])
{
let mut cases = Punctuated::new();
cases.push_value(pat);
while input.peek(Token![|]) && !input.peek(Token![||]) && !input.peek(Token![|=]) {
let punct = input.parse()?;
cases.push_punct(punct);
let pat: Pat = input.parse()?;
cases.push_value(pat);
}
pat = Pat::Or(PatOr {
attrs: Vec::new(),
leading_vert,
cases,
});
}
Ok(pat)
}src/expr.rs (line 1912)
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fn paren_or_tuple(input: ParseStream) -> Result<Expr> {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(Expr::Tuple(ExprTuple {
attrs: Vec::new(),
paren_token,
elems: Punctuated::new(),
}));
}
let first: Expr = content.parse()?;
if content.is_empty() {
return Ok(Expr::Paren(ExprParen {
attrs: Vec::new(),
paren_token,
expr: Box::new(first),
}));
}
let mut elems = Punctuated::new();
elems.push_value(first);
while !content.is_empty() {
let punct = content.parse()?;
elems.push_punct(punct);
if content.is_empty() {
break;
}
let value = content.parse()?;
elems.push_value(value);
}
Ok(Expr::Tuple(ExprTuple {
attrs: Vec::new(),
paren_token,
elems,
}))
}
#[cfg(feature = "full")]
fn array_or_repeat(input: ParseStream) -> Result<Expr> {
let content;
let bracket_token = bracketed!(content in input);
if content.is_empty() {
return Ok(Expr::Array(ExprArray {
attrs: Vec::new(),
bracket_token,
elems: Punctuated::new(),
}));
}
let first: Expr = content.parse()?;
if content.is_empty() || content.peek(Token![,]) {
let mut elems = Punctuated::new();
elems.push_value(first);
while !content.is_empty() {
let punct = content.parse()?;
elems.push_punct(punct);
if content.is_empty() {
break;
}
let value = content.parse()?;
elems.push_value(value);
}
Ok(Expr::Array(ExprArray {
attrs: Vec::new(),
bracket_token,
elems,
}))
} else if content.peek(Token![;]) {
let semi_token: Token![;] = content.parse()?;
let len: Expr = content.parse()?;
Ok(Expr::Repeat(ExprRepeat {
attrs: Vec::new(),
bracket_token,
expr: Box::new(first),
semi_token,
len: Box::new(len),
}))
} else {
Err(content.error("expected `,` or `;`"))
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprArray {
fn parse(input: ParseStream) -> Result<Self> {
let content;
let bracket_token = bracketed!(content in input);
let mut elems = Punctuated::new();
while !content.is_empty() {
let first: Expr = content.parse()?;
elems.push_value(first);
if content.is_empty() {
break;
}
let punct = content.parse()?;
elems.push_punct(punct);
}
Ok(ExprArray {
attrs: Vec::new(),
bracket_token,
elems,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprRepeat {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ExprRepeat {
bracket_token: bracketed!(content in input),
attrs: Vec::new(),
expr: content.parse()?,
semi_token: content.parse()?,
len: content.parse()?,
})
}
}
#[cfg(feature = "full")]
pub(crate) fn expr_early(input: ParseStream) -> Result<Expr> {
let mut attrs = input.call(expr_attrs)?;
let mut expr = if input.peek(Token![if]) {
Expr::If(input.parse()?)
} else if input.peek(Token![while]) {
Expr::While(input.parse()?)
} else if input.peek(Token![for])
&& !(input.peek2(Token![<]) && (input.peek3(Lifetime) || input.peek3(Token![>])))
{
Expr::ForLoop(input.parse()?)
} else if input.peek(Token![loop]) {
Expr::Loop(input.parse()?)
} else if input.peek(Token![match]) {
Expr::Match(input.parse()?)
} else if input.peek(Token![try]) && input.peek2(token::Brace) {
Expr::TryBlock(input.parse()?)
} else if input.peek(Token![unsafe]) {
Expr::Unsafe(input.parse()?)
} else if input.peek(Token![const]) {
Expr::Verbatim(input.call(expr_const)?)
} else if input.peek(token::Brace) {
Expr::Block(input.parse()?)
} else {
let allow_struct = AllowStruct(true);
let mut expr = unary_expr(input, allow_struct)?;
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
return parse_expr(input, expr, allow_struct, Precedence::Any);
};
if input.peek(Token![.]) && !input.peek(Token![..]) || input.peek(Token![?]) {
expr = trailer_helper(input, expr)?;
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
let allow_struct = AllowStruct(true);
return parse_expr(input, expr, allow_struct, Precedence::Any);
}
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
Ok(expr)
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLit {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprLit {
attrs: Vec::new(),
lit: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn expr_group(input: ParseStream) -> Result<ExprGroup> {
let group = crate::group::parse_group(input)?;
Ok(ExprGroup {
attrs: Vec::new(),
group_token: group.token,
expr: group.content.parse()?,
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprParen {
fn parse(input: ParseStream) -> Result<Self> {
expr_paren(input)
}
}
fn expr_paren(input: ParseStream) -> Result<ExprParen> {
let content;
Ok(ExprParen {
attrs: Vec::new(),
paren_token: parenthesized!(content in input),
expr: content.parse()?,
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericMethodArgument {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lit) {
let lit = input.parse()?;
return Ok(GenericMethodArgument::Const(Expr::Lit(lit)));
}
if input.peek(token::Brace) {
let block: ExprBlock = input.parse()?;
return Ok(GenericMethodArgument::Const(Expr::Block(block)));
}
input.parse().map(GenericMethodArgument::Type)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for MethodTurbofish {
fn parse(input: ParseStream) -> Result<Self> {
Ok(MethodTurbofish {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value: GenericMethodArgument = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLet {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprLet {
attrs: Vec::new(),
let_token: input.parse()?,
pat: pat::parsing::multi_pat_with_leading_vert(input)?,
eq_token: input.parse()?,
expr: Box::new({
let allow_struct = AllowStruct(false);
let lhs = unary_expr(input, allow_struct)?;
parse_expr(input, lhs, allow_struct, Precedence::Compare)?
}),
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprIf {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
Ok(ExprIf {
attrs,
if_token: input.parse()?,
cond: Box::new(input.call(Expr::parse_without_eager_brace)?),
then_branch: input.parse()?,
else_branch: {
if input.peek(Token![else]) {
Some(input.call(else_block)?)
} else {
None
}
},
})
}
}
#[cfg(feature = "full")]
fn else_block(input: ParseStream) -> Result<(Token![else], Box<Expr>)> {
let else_token: Token![else] = input.parse()?;
let lookahead = input.lookahead1();
let else_branch = if input.peek(Token![if]) {
input.parse().map(Expr::If)?
} else if input.peek(token::Brace) {
Expr::Block(ExprBlock {
attrs: Vec::new(),
label: None,
block: input.parse()?,
})
} else {
return Err(lookahead.error());
};
Ok((else_token, Box::new(else_branch)))
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprForLoop {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let for_token: Token![for] = input.parse()?;
let pat = pat::parsing::multi_pat_with_leading_vert(input)?;
let in_token: Token![in] = input.parse()?;
let expr: Expr = input.call(Expr::parse_without_eager_brace)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprForLoop {
attrs,
label,
for_token,
pat,
in_token,
expr: Box::new(expr),
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLoop {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let loop_token: Token![loop] = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprLoop {
attrs,
label,
loop_token,
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprMatch {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let match_token: Token![match] = input.parse()?;
let expr = Expr::parse_without_eager_brace(input)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut arms = Vec::new();
while !content.is_empty() {
arms.push(content.call(Arm::parse)?);
}
Ok(ExprMatch {
attrs,
match_token,
expr: Box::new(expr),
brace_token,
arms,
})
}
}
macro_rules! impl_by_parsing_expr {
(
$(
$expr_type:ty, $variant:ident, $msg:expr,
)*
) => {
$(
#[cfg(all(feature = "full", feature = "printing"))]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for $expr_type {
fn parse(input: ParseStream) -> Result<Self> {
let mut expr: Expr = input.parse()?;
loop {
match expr {
Expr::$variant(inner) => return Ok(inner),
Expr::Group(next) => expr = *next.expr,
_ => return Err(Error::new_spanned(expr, $msg)),
}
}
}
}
)*
};
}
impl_by_parsing_expr! {
ExprAssign, Assign, "expected assignment expression",
ExprAssignOp, AssignOp, "expected compound assignment expression",
ExprAwait, Await, "expected await expression",
ExprBinary, Binary, "expected binary operation",
ExprCall, Call, "expected function call expression",
ExprCast, Cast, "expected cast expression",
ExprField, Field, "expected struct field access",
ExprIndex, Index, "expected indexing expression",
ExprMethodCall, MethodCall, "expected method call expression",
ExprRange, Range, "expected range expression",
ExprTry, Try, "expected try expression",
ExprTuple, Tuple, "expected tuple expression",
ExprType, Type, "expected type ascription expression",
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprBox {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = Vec::new();
let allow_struct = AllowStruct(true);
expr_box(input, attrs, allow_struct)
}
}
#[cfg(feature = "full")]
fn expr_box(
input: ParseStream,
attrs: Vec<Attribute>,
allow_struct: AllowStruct,
) -> Result<ExprBox> {
Ok(ExprBox {
attrs,
box_token: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprUnary {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = Vec::new();
let allow_struct = AllowStruct(true);
expr_unary(input, attrs, allow_struct)
}
}
#[cfg(feature = "full")]
fn expr_unary(
input: ParseStream,
attrs: Vec<Attribute>,
allow_struct: AllowStruct,
) -> Result<ExprUnary> {
Ok(ExprUnary {
attrs,
op: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprClosure {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_closure(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprReference {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
Ok(ExprReference {
attrs: Vec::new(),
and_token: input.parse()?,
raw: Reserved::default(),
mutability: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprBreak {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_break(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprReturn {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_ret(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprTryBlock {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprTryBlock {
attrs: Vec::new(),
try_token: input.parse()?,
block: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprYield {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprYield {
attrs: Vec::new(),
yield_token: input.parse()?,
expr: {
if !input.is_empty() && !input.peek(Token![,]) && !input.peek(Token![;]) {
Some(input.parse()?)
} else {
None
}
},
})
}
}
#[cfg(feature = "full")]
fn expr_closure(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprClosure> {
let movability: Option<Token![static]> = input.parse()?;
let asyncness: Option<Token![async]> = input.parse()?;
let capture: Option<Token![move]> = input.parse()?;
let or1_token: Token![|] = input.parse()?;
let mut inputs = Punctuated::new();
loop {
if input.peek(Token![|]) {
break;
}
let value = closure_arg(input)?;
inputs.push_value(value);
if input.peek(Token![|]) {
break;
}
let punct: Token![,] = input.parse()?;
inputs.push_punct(punct);
}
let or2_token: Token![|] = input.parse()?;
let (output, body) = if input.peek(Token![->]) {
let arrow_token: Token![->] = input.parse()?;
let ty: Type = input.parse()?;
let body: Block = input.parse()?;
let output = ReturnType::Type(arrow_token, Box::new(ty));
let block = Expr::Block(ExprBlock {
attrs: Vec::new(),
label: None,
block: body,
});
(output, block)
} else {
let body = ambiguous_expr(input, allow_struct)?;
(ReturnType::Default, body)
};
Ok(ExprClosure {
attrs: Vec::new(),
movability,
asyncness,
capture,
or1_token,
inputs,
or2_token,
output,
body: Box::new(body),
})
}src/generics.rs (lines 615-618)
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fn parse(input: ParseStream) -> Result<Self> {
if !input.peek(Token![<]) {
return Ok(Generics::default());
}
let lt_token: Token![<] = input.parse()?;
let mut params = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let attrs = input.call(Attribute::parse_outer)?;
let lookahead = input.lookahead1();
if lookahead.peek(Lifetime) {
params.push_value(GenericParam::Lifetime(LifetimeDef {
attrs,
..input.parse()?
}));
} else if lookahead.peek(Ident) {
params.push_value(GenericParam::Type(TypeParam {
attrs,
..input.parse()?
}));
} else if lookahead.peek(Token![const]) {
params.push_value(GenericParam::Const(ConstParam {
attrs,
..input.parse()?
}));
} else if input.peek(Token![_]) {
params.push_value(GenericParam::Type(TypeParam {
attrs,
ident: input.call(Ident::parse_any)?,
colon_token: None,
bounds: Punctuated::new(),
eq_token: None,
default: None,
}));
} else {
return Err(lookahead.error());
}
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
params.push_punct(punct);
}
let gt_token: Token![>] = input.parse()?;
Ok(Generics {
lt_token: Some(lt_token),
params,
gt_token: Some(gt_token),
where_clause: None,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericParam {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let lookahead = input.lookahead1();
if lookahead.peek(Ident) {
Ok(GenericParam::Type(TypeParam {
attrs,
..input.parse()?
}))
} else if lookahead.peek(Lifetime) {
Ok(GenericParam::Lifetime(LifetimeDef {
attrs,
..input.parse()?
}))
} else if lookahead.peek(Token![const]) {
Ok(GenericParam::Const(ConstParam {
attrs,
..input.parse()?
}))
} else {
Err(lookahead.error())
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for LifetimeDef {
fn parse(input: ParseStream) -> Result<Self> {
let has_colon;
Ok(LifetimeDef {
attrs: input.call(Attribute::parse_outer)?,
lifetime: input.parse()?,
colon_token: {
if input.peek(Token![:]) {
has_colon = true;
Some(input.parse()?)
} else {
has_colon = false;
None
}
},
bounds: {
let mut bounds = Punctuated::new();
if has_colon {
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
}
bounds
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for BoundLifetimes {
fn parse(input: ParseStream) -> Result<Self> {
Ok(BoundLifetimes {
for_token: input.parse()?,
lt_token: input.parse()?,
lifetimes: {
let mut lifetimes = Punctuated::new();
while !input.peek(Token![>]) {
lifetimes.push_value(input.parse()?);
if input.peek(Token![>]) {
break;
}
lifetimes.push_punct(input.parse()?);
}
lifetimes
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<BoundLifetimes> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![for]) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeParam {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let ident: Ident = input.parse()?;
let colon_token: Option<Token![:]> = input.parse()?;
let begin_bound = input.fork();
let mut is_maybe_const = false;
let mut bounds = Punctuated::new();
if colon_token.is_some() {
loop {
if input.peek(Token![,]) || input.peek(Token![>]) || input.peek(Token![=]) {
break;
}
if input.peek(Token![~]) && input.peek2(Token![const]) {
input.parse::<Token![~]>()?;
input.parse::<Token![const]>()?;
is_maybe_const = true;
}
let value: TypeParamBound = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct: Token![+] = input.parse()?;
bounds.push_punct(punct);
}
}
let mut eq_token: Option<Token![=]> = input.parse()?;
let mut default = if eq_token.is_some() {
Some(input.parse::<Type>()?)
} else {
None
};
if is_maybe_const {
bounds.clear();
eq_token = None;
default = Some(Type::Verbatim(verbatim::between(begin_bound, input)));
}
Ok(TypeParam {
attrs,
ident,
colon_token,
bounds,
eq_token,
default,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeParamBound {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) {
return input.parse().map(TypeParamBound::Lifetime);
}
if input.peek(token::Paren) {
let content;
let paren_token = parenthesized!(content in input);
let mut bound: TraitBound = content.parse()?;
bound.paren_token = Some(paren_token);
return Ok(TypeParamBound::Trait(bound));
}
input.parse().map(TypeParamBound::Trait)
}
}
impl TypeParamBound {
pub(crate) fn parse_multiple(
input: ParseStream,
allow_plus: bool,
) -> Result<Punctuated<Self, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
bounds.push_value(input.parse()?);
if !(allow_plus && input.peek(Token![+])) {
break;
}
bounds.push_punct(input.parse()?);
if !(input.peek(Ident::peek_any)
|| input.peek(Token![::])
|| input.peek(Token![?])
|| input.peek(Lifetime)
|| input.peek(token::Paren))
{
break;
}
}
Ok(bounds)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitBound {
fn parse(input: ParseStream) -> Result<Self> {
#[cfg(feature = "full")]
let tilde_const = if input.peek(Token![~]) && input.peek2(Token![const]) {
let tilde_token = input.parse::<Token![~]>()?;
let const_token = input.parse::<Token![const]>()?;
Some((tilde_token, const_token))
} else {
None
};
let modifier: TraitBoundModifier = input.parse()?;
let lifetimes: Option<BoundLifetimes> = input.parse()?;
let mut path: Path = input.parse()?;
if path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
}
#[cfg(feature = "full")]
{
if let Some((tilde_token, const_token)) = tilde_const {
path.segments.insert(
0,
PathSegment {
ident: Ident::new("const", const_token.span),
arguments: PathArguments::None,
},
);
let (_const, punct) = path.segments.pairs_mut().next().unwrap().into_tuple();
*punct.unwrap() = Token;
}
}
Ok(TraitBound {
paren_token: None,
modifier,
lifetimes,
path,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitBoundModifier {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![?]) {
input.parse().map(TraitBoundModifier::Maybe)
} else {
Ok(TraitBoundModifier::None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ConstParam {
fn parse(input: ParseStream) -> Result<Self> {
let mut default = None;
Ok(ConstParam {
attrs: input.call(Attribute::parse_outer)?,
const_token: input.parse()?,
ident: input.parse()?,
colon_token: input.parse()?,
ty: input.parse()?,
eq_token: {
if input.peek(Token![=]) {
let eq_token = input.parse()?;
default = Some(path::parsing::const_argument(input)?);
Some(eq_token)
} else {
None
}
},
default,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for WhereClause {
fn parse(input: ParseStream) -> Result<Self> {
Ok(WhereClause {
where_token: input.parse()?,
predicates: {
let mut predicates = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
predicates.push_value(value);
if !input.peek(Token![,]) {
break;
}
let punct = input.parse()?;
predicates.push_punct(punct);
}
predicates
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<WhereClause> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![where]) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for WherePredicate {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) && input.peek2(Token![:]) {
Ok(WherePredicate::Lifetime(PredicateLifetime {
lifetime: input.parse()?,
colon_token: input.parse()?,
bounds: {
let mut bounds = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
bounds
},
}))
} else {
Ok(WherePredicate::Type(PredicateType {
lifetimes: input.parse()?,
bounded_ty: input.parse()?,
colon_token: input.parse()?,
bounds: {
let mut bounds = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
bounds
},
}))
}
}Additional examples can be found in:
sourcepub fn push_punct(&mut self, punctuation: P)
pub fn push_punct(&mut self, punctuation: P)
Appends a trailing punctuation onto the end of this punctuated sequence. The sequence must be non-empty and must not already have trailing punctuation.
Panics
Panics if the sequence is empty or already has a trailing punctuation.
Examples found in repository?
src/punctuated.rs (line 225)
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pub fn push(&mut self, value: T)
where
P: Default,
{
if !self.empty_or_trailing() {
self.push_punct(Default::default());
}
self.push_value(value);
}
/// Inserts an element at position `index`.
///
/// # Panics
///
/// Panics if `index` is greater than the number of elements previously in
/// this punctuated sequence.
pub fn insert(&mut self, index: usize, value: T)
where
P: Default,
{
assert!(
index <= self.len(),
"Punctuated::insert: index out of range",
);
if index == self.len() {
self.push(value);
} else {
self.inner.insert(index, (value, Default::default()));
}
}
/// Clears the sequence of all values and punctuation, making it empty.
pub fn clear(&mut self) {
self.inner.clear();
self.last = None;
}
/// Parses zero or more occurrences of `T` separated by punctuation of type
/// `P`, with optional trailing punctuation.
///
/// Parsing continues until the end of this parse stream. The entire content
/// of this parse stream must consist of `T` and `P`.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Parse,
{
Self::parse_terminated_with(input, T::parse)
}
/// Parses zero or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, with optional trailing
/// punctuation.
///
/// Like [`parse_terminated`], the entire content of this stream is expected
/// to be parsed.
///
/// [`parse_terminated`]: Punctuated::parse_terminated
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}More examples
src/path.rs (line 376)
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fn parse(input: ParseStream) -> Result<Self> {
Ok(AngleBracketedGenericArguments {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ParenthesizedGenericArguments {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ParenthesizedGenericArguments {
paren_token: parenthesized!(content in input),
inputs: content.parse_terminated(Type::parse)?,
output: input.call(ReturnType::without_plus)?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for PathSegment {
fn parse(input: ParseStream) -> Result<Self> {
Self::parse_helper(input, false)
}
}
impl PathSegment {
fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
if input.peek(Token![super]) || input.peek(Token![self]) || input.peek(Token![crate]) {
let ident = input.call(Ident::parse_any)?;
return Ok(PathSegment::from(ident));
}
let ident = if input.peek(Token![Self]) {
input.call(Ident::parse_any)?
} else {
input.parse()?
};
if !expr_style && input.peek(Token![<]) && !input.peek(Token![<=])
|| input.peek(Token![::]) && input.peek3(Token![<])
{
Ok(PathSegment {
ident,
arguments: PathArguments::AngleBracketed(input.parse()?),
})
} else {
Ok(PathSegment::from(ident))
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Binding {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Binding {
ident: input.parse()?,
eq_token: input.parse()?,
ty: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Constraint {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Constraint {
ident: input.parse()?,
colon_token: input.parse()?,
bounds: constraint_bounds(input)?,
})
}
}
#[cfg(feature = "full")]
fn constraint_bounds(input: ParseStream) -> Result<Punctuated<TypeParamBound, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
Ok(bounds)
}
impl Path {
/// Parse a `Path` containing no path arguments on any of its segments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Path, Result, Token};
/// use syn::parse::{Parse, ParseStream};
///
/// // A simplified single `use` statement like:
/// //
/// // use std::collections::HashMap;
/// //
/// // Note that generic parameters are not allowed in a `use` statement
/// // so the following must not be accepted.
/// //
/// // use a::<b>::c;
/// struct SingleUse {
/// use_token: Token![use],
/// path: Path,
/// }
///
/// impl Parse for SingleUse {
/// fn parse(input: ParseStream) -> Result<Self> {
/// Ok(SingleUse {
/// use_token: input.parse()?,
/// path: input.call(Path::parse_mod_style)?,
/// })
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_mod_style(input: ParseStream) -> Result<Self> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
loop {
if !input.peek(Ident)
&& !input.peek(Token![super])
&& !input.peek(Token![self])
&& !input.peek(Token![Self])
&& !input.peek(Token![crate])
{
break;
}
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}
/// Determines whether this is a path of length 1 equal to the given
/// ident.
///
/// For them to compare equal, it must be the case that:
///
/// - the path has no leading colon,
/// - the number of path segments is 1,
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments, and
/// - the ident of the first path segment is equal to the given one.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
///
/// # Example
///
/// ```
/// use syn::{Attribute, Error, Meta, NestedMeta, Result};
/// # use std::iter::FromIterator;
///
/// fn get_serde_meta_items(attr: &Attribute) -> Result<Vec<NestedMeta>> {
/// if attr.path.is_ident("serde") {
/// match attr.parse_meta()? {
/// Meta::List(meta) => Ok(Vec::from_iter(meta.nested)),
/// bad => Err(Error::new_spanned(bad, "unrecognized attribute")),
/// }
/// } else {
/// Ok(Vec::new())
/// }
/// }
/// ```
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn is_ident<I: ?Sized>(&self, ident: &I) -> bool
where
Ident: PartialEq<I>,
{
match self.get_ident() {
Some(id) => id == ident,
None => false,
}
}
/// If this path consists of a single ident, returns the ident.
///
/// A path is considered an ident if:
///
/// - the path has no leading colon,
/// - the number of path segments is 1, and
/// - the first path segment has no angle bracketed or parenthesized
/// path arguments.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn get_ident(&self) -> Option<&Ident> {
if self.leading_colon.is_none()
&& self.segments.len() == 1
&& self.segments[0].arguments.is_none()
{
Some(&self.segments[0].ident)
} else {
None
}
}
pub(crate) fn parse_helper(input: ParseStream, expr_style: bool) -> Result<Self> {
let mut path = Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
let value = PathSegment::parse_helper(input, expr_style)?;
segments.push_value(value);
segments
},
};
Path::parse_rest(input, &mut path, expr_style)?;
Ok(path)
}
pub(crate) fn parse_rest(
input: ParseStream,
path: &mut Self,
expr_style: bool,
) -> Result<()> {
while input.peek(Token![::]) && !input.peek3(token::Paren) {
let punct: Token![::] = input.parse()?;
path.segments.push_punct(punct);
let value = PathSegment::parse_helper(input, expr_style)?;
path.segments.push_value(value);
}
Ok(())
}
}
pub fn qpath(input: ParseStream, expr_style: bool) -> Result<(Option<QSelf>, Path)> {
if input.peek(Token![<]) {
let lt_token: Token![<] = input.parse()?;
let this: Type = input.parse()?;
let path = if input.peek(Token![as]) {
let as_token: Token![as] = input.parse()?;
let path: Path = input.parse()?;
Some((as_token, path))
} else {
None
};
let gt_token: Token![>] = input.parse()?;
let colon2_token: Token![::] = input.parse()?;
let mut rest = Punctuated::new();
loop {
let path = PathSegment::parse_helper(input, expr_style)?;
rest.push_value(path);
if !input.peek(Token![::]) {
break;
}
let punct: Token![::] = input.parse()?;
rest.push_punct(punct);
}
let (position, as_token, path) = match path {
Some((as_token, mut path)) => {
let pos = path.segments.len();
path.segments.push_punct(colon2_token);
path.segments.extend(rest.into_pairs());
(pos, Some(as_token), path)
}
None => {
let path = Path {
leading_colon: Some(colon2_token),
segments: rest,
};
(0, None, path)
}
};
let qself = QSelf {
lt_token,
ty: Box::new(this),
position,
as_token,
gt_token,
};
Ok((Some(qself), path))
} else {
let path = Path::parse_helper(input, expr_style)?;
Ok((None, path))
}
}src/attr.rs (line 545)
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fn parse_meta_path(input: ParseStream) -> Result<Path> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
while input.peek(Ident::peek_any) {
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}src/pat.rs (line 490)
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fn pat_struct(begin: ParseBuffer, input: ParseStream, path: Path) -> Result<Pat> {
let content;
let brace_token = braced!(content in input);
let mut fields = Punctuated::new();
let mut dot2_token = None;
while !content.is_empty() {
let attrs = content.call(Attribute::parse_outer)?;
if content.peek(Token![..]) {
dot2_token = Some(content.parse()?);
if !attrs.is_empty() {
return Ok(Pat::Verbatim(verbatim::between(begin, input)));
}
break;
}
let mut value = content.call(field_pat)?;
value.attrs = attrs;
fields.push_value(value);
if content.is_empty() {
break;
}
let punct: Token![,] = content.parse()?;
fields.push_punct(punct);
}
Ok(Pat::Struct(PatStruct {
attrs: Vec::new(),
path,
brace_token,
fields,
dot2_token,
}))
}
impl Member {
fn is_unnamed(&self) -> bool {
match *self {
Member::Named(_) => false,
Member::Unnamed(_) => true,
}
}
}
fn field_pat(input: ParseStream) -> Result<FieldPat> {
let boxed: Option<Token![box]> = input.parse()?;
let by_ref: Option<Token![ref]> = input.parse()?;
let mutability: Option<Token![mut]> = input.parse()?;
let member: Member = input.parse()?;
if boxed.is_none() && by_ref.is_none() && mutability.is_none() && input.peek(Token![:])
|| member.is_unnamed()
{
return Ok(FieldPat {
attrs: Vec::new(),
member,
colon_token: input.parse()?,
pat: Box::new(multi_pat_with_leading_vert(input)?),
});
}
let ident = match member {
Member::Named(ident) => ident,
Member::Unnamed(_) => unreachable!(),
};
let mut pat = Pat::Ident(PatIdent {
attrs: Vec::new(),
by_ref,
mutability,
ident: ident.clone(),
subpat: None,
});
if let Some(boxed) = boxed {
pat = Pat::Box(PatBox {
attrs: Vec::new(),
box_token: boxed,
pat: Box::new(pat),
});
}
Ok(FieldPat {
attrs: Vec::new(),
member: Member::Named(ident),
colon_token: None,
pat: Box::new(pat),
})
}
fn pat_range(
input: ParseStream,
begin: ParseBuffer,
qself: Option<QSelf>,
path: Path,
) -> Result<Pat> {
let limits: RangeLimits = input.parse()?;
let hi = input.call(pat_lit_expr)?;
if let Some(hi) = hi {
Ok(Pat::Range(PatRange {
attrs: Vec::new(),
lo: Box::new(Expr::Path(ExprPath {
attrs: Vec::new(),
qself,
path,
})),
limits,
hi,
}))
} else {
Ok(Pat::Verbatim(verbatim::between(begin, input)))
}
}
fn pat_range_half_open(input: ParseStream, begin: ParseBuffer) -> Result<Pat> {
let limits: RangeLimits = input.parse()?;
let hi = input.call(pat_lit_expr)?;
if hi.is_some() {
Ok(Pat::Verbatim(verbatim::between(begin, input)))
} else {
match limits {
RangeLimits::HalfOpen(dot2_token) => Ok(Pat::Rest(PatRest {
attrs: Vec::new(),
dot2_token,
})),
RangeLimits::Closed(_) => Err(input.error("expected range upper bound")),
}
}
}
fn pat_tuple(input: ParseStream) -> Result<PatTuple> {
let content;
let paren_token = parenthesized!(content in input);
let mut elems = Punctuated::new();
while !content.is_empty() {
let value = multi_pat_with_leading_vert(&content)?;
elems.push_value(value);
if content.is_empty() {
break;
}
let punct = content.parse()?;
elems.push_punct(punct);
}
Ok(PatTuple {
attrs: Vec::new(),
paren_token,
elems,
})
}
fn pat_reference(input: ParseStream) -> Result<PatReference> {
Ok(PatReference {
attrs: Vec::new(),
and_token: input.parse()?,
mutability: input.parse()?,
pat: input.parse()?,
})
}
fn pat_lit_or_range(input: ParseStream) -> Result<Pat> {
let begin = input.fork();
let lo = input.call(pat_lit_expr)?.unwrap();
if input.peek(Token![..]) {
let limits: RangeLimits = input.parse()?;
let hi = input.call(pat_lit_expr)?;
if let Some(hi) = hi {
Ok(Pat::Range(PatRange {
attrs: Vec::new(),
lo,
limits,
hi,
}))
} else {
Ok(Pat::Verbatim(verbatim::between(begin, input)))
}
} else if let Expr::Verbatim(verbatim) = *lo {
Ok(Pat::Verbatim(verbatim))
} else {
Ok(Pat::Lit(PatLit {
attrs: Vec::new(),
expr: lo,
}))
}
}
fn pat_lit_expr(input: ParseStream) -> Result<Option<Box<Expr>>> {
if input.is_empty()
|| input.peek(Token![|])
|| input.peek(Token![=])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![,])
|| input.peek(Token![;])
{
return Ok(None);
}
let neg: Option<Token![-]> = input.parse()?;
let lookahead = input.lookahead1();
let expr = if lookahead.peek(Lit) {
Expr::Lit(input.parse()?)
} else if lookahead.peek(Ident)
|| lookahead.peek(Token![::])
|| lookahead.peek(Token![<])
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![Self])
|| lookahead.peek(Token![super])
|| lookahead.peek(Token![crate])
{
Expr::Path(input.parse()?)
} else if lookahead.peek(Token![const]) {
Expr::Verbatim(input.call(expr::parsing::expr_const)?)
} else {
return Err(lookahead.error());
};
Ok(Some(Box::new(if let Some(neg) = neg {
Expr::Unary(ExprUnary {
attrs: Vec::new(),
op: UnOp::Neg(neg),
expr: Box::new(expr),
})
} else {
expr
})))
}
fn pat_slice(input: ParseStream) -> Result<PatSlice> {
let content;
let bracket_token = bracketed!(content in input);
let mut elems = Punctuated::new();
while !content.is_empty() {
let value = multi_pat_with_leading_vert(&content)?;
elems.push_value(value);
if content.is_empty() {
break;
}
let punct = content.parse()?;
elems.push_punct(punct);
}
Ok(PatSlice {
attrs: Vec::new(),
bracket_token,
elems,
})
}
fn pat_const(input: ParseStream) -> Result<TokenStream> {
let begin = input.fork();
input.parse::<Token![const]>()?;
let content;
braced!(content in input);
content.call(Attribute::parse_inner)?;
content.call(Block::parse_within)?;
Ok(verbatim::between(begin, input))
}
pub fn multi_pat(input: ParseStream) -> Result<Pat> {
multi_pat_impl(input, None)
}
pub fn multi_pat_with_leading_vert(input: ParseStream) -> Result<Pat> {
let leading_vert: Option<Token![|]> = input.parse()?;
multi_pat_impl(input, leading_vert)
}
fn multi_pat_impl(input: ParseStream, leading_vert: Option<Token![|]>) -> Result<Pat> {
let mut pat: Pat = input.parse()?;
if leading_vert.is_some()
|| input.peek(Token![|]) && !input.peek(Token![||]) && !input.peek(Token![|=])
{
let mut cases = Punctuated::new();
cases.push_value(pat);
while input.peek(Token![|]) && !input.peek(Token![||]) && !input.peek(Token![|=]) {
let punct = input.parse()?;
cases.push_punct(punct);
let pat: Pat = input.parse()?;
cases.push_value(pat);
}
pat = Pat::Or(PatOr {
attrs: Vec::new(),
leading_vert,
cases,
});
}
Ok(pat)
}src/expr.rs (line 1915)
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fn paren_or_tuple(input: ParseStream) -> Result<Expr> {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(Expr::Tuple(ExprTuple {
attrs: Vec::new(),
paren_token,
elems: Punctuated::new(),
}));
}
let first: Expr = content.parse()?;
if content.is_empty() {
return Ok(Expr::Paren(ExprParen {
attrs: Vec::new(),
paren_token,
expr: Box::new(first),
}));
}
let mut elems = Punctuated::new();
elems.push_value(first);
while !content.is_empty() {
let punct = content.parse()?;
elems.push_punct(punct);
if content.is_empty() {
break;
}
let value = content.parse()?;
elems.push_value(value);
}
Ok(Expr::Tuple(ExprTuple {
attrs: Vec::new(),
paren_token,
elems,
}))
}
#[cfg(feature = "full")]
fn array_or_repeat(input: ParseStream) -> Result<Expr> {
let content;
let bracket_token = bracketed!(content in input);
if content.is_empty() {
return Ok(Expr::Array(ExprArray {
attrs: Vec::new(),
bracket_token,
elems: Punctuated::new(),
}));
}
let first: Expr = content.parse()?;
if content.is_empty() || content.peek(Token![,]) {
let mut elems = Punctuated::new();
elems.push_value(first);
while !content.is_empty() {
let punct = content.parse()?;
elems.push_punct(punct);
if content.is_empty() {
break;
}
let value = content.parse()?;
elems.push_value(value);
}
Ok(Expr::Array(ExprArray {
attrs: Vec::new(),
bracket_token,
elems,
}))
} else if content.peek(Token![;]) {
let semi_token: Token![;] = content.parse()?;
let len: Expr = content.parse()?;
Ok(Expr::Repeat(ExprRepeat {
attrs: Vec::new(),
bracket_token,
expr: Box::new(first),
semi_token,
len: Box::new(len),
}))
} else {
Err(content.error("expected `,` or `;`"))
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprArray {
fn parse(input: ParseStream) -> Result<Self> {
let content;
let bracket_token = bracketed!(content in input);
let mut elems = Punctuated::new();
while !content.is_empty() {
let first: Expr = content.parse()?;
elems.push_value(first);
if content.is_empty() {
break;
}
let punct = content.parse()?;
elems.push_punct(punct);
}
Ok(ExprArray {
attrs: Vec::new(),
bracket_token,
elems,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprRepeat {
fn parse(input: ParseStream) -> Result<Self> {
let content;
Ok(ExprRepeat {
bracket_token: bracketed!(content in input),
attrs: Vec::new(),
expr: content.parse()?,
semi_token: content.parse()?,
len: content.parse()?,
})
}
}
#[cfg(feature = "full")]
pub(crate) fn expr_early(input: ParseStream) -> Result<Expr> {
let mut attrs = input.call(expr_attrs)?;
let mut expr = if input.peek(Token![if]) {
Expr::If(input.parse()?)
} else if input.peek(Token![while]) {
Expr::While(input.parse()?)
} else if input.peek(Token![for])
&& !(input.peek2(Token![<]) && (input.peek3(Lifetime) || input.peek3(Token![>])))
{
Expr::ForLoop(input.parse()?)
} else if input.peek(Token![loop]) {
Expr::Loop(input.parse()?)
} else if input.peek(Token![match]) {
Expr::Match(input.parse()?)
} else if input.peek(Token![try]) && input.peek2(token::Brace) {
Expr::TryBlock(input.parse()?)
} else if input.peek(Token![unsafe]) {
Expr::Unsafe(input.parse()?)
} else if input.peek(Token![const]) {
Expr::Verbatim(input.call(expr_const)?)
} else if input.peek(token::Brace) {
Expr::Block(input.parse()?)
} else {
let allow_struct = AllowStruct(true);
let mut expr = unary_expr(input, allow_struct)?;
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
return parse_expr(input, expr, allow_struct, Precedence::Any);
};
if input.peek(Token![.]) && !input.peek(Token![..]) || input.peek(Token![?]) {
expr = trailer_helper(input, expr)?;
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
let allow_struct = AllowStruct(true);
return parse_expr(input, expr, allow_struct, Precedence::Any);
}
attrs.extend(expr.replace_attrs(Vec::new()));
expr.replace_attrs(attrs);
Ok(expr)
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLit {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprLit {
attrs: Vec::new(),
lit: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn expr_group(input: ParseStream) -> Result<ExprGroup> {
let group = crate::group::parse_group(input)?;
Ok(ExprGroup {
attrs: Vec::new(),
group_token: group.token,
expr: group.content.parse()?,
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprParen {
fn parse(input: ParseStream) -> Result<Self> {
expr_paren(input)
}
}
fn expr_paren(input: ParseStream) -> Result<ExprParen> {
let content;
Ok(ExprParen {
attrs: Vec::new(),
paren_token: parenthesized!(content in input),
expr: content.parse()?,
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericMethodArgument {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lit) {
let lit = input.parse()?;
return Ok(GenericMethodArgument::Const(Expr::Lit(lit)));
}
if input.peek(token::Brace) {
let block: ExprBlock = input.parse()?;
return Ok(GenericMethodArgument::Const(Expr::Block(block)));
}
input.parse().map(GenericMethodArgument::Type)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for MethodTurbofish {
fn parse(input: ParseStream) -> Result<Self> {
Ok(MethodTurbofish {
colon2_token: input.parse()?,
lt_token: input.parse()?,
args: {
let mut args = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let value: GenericMethodArgument = input.parse()?;
args.push_value(value);
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
args.push_punct(punct);
}
args
},
gt_token: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLet {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprLet {
attrs: Vec::new(),
let_token: input.parse()?,
pat: pat::parsing::multi_pat_with_leading_vert(input)?,
eq_token: input.parse()?,
expr: Box::new({
let allow_struct = AllowStruct(false);
let lhs = unary_expr(input, allow_struct)?;
parse_expr(input, lhs, allow_struct, Precedence::Compare)?
}),
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprIf {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
Ok(ExprIf {
attrs,
if_token: input.parse()?,
cond: Box::new(input.call(Expr::parse_without_eager_brace)?),
then_branch: input.parse()?,
else_branch: {
if input.peek(Token![else]) {
Some(input.call(else_block)?)
} else {
None
}
},
})
}
}
#[cfg(feature = "full")]
fn else_block(input: ParseStream) -> Result<(Token![else], Box<Expr>)> {
let else_token: Token![else] = input.parse()?;
let lookahead = input.lookahead1();
let else_branch = if input.peek(Token![if]) {
input.parse().map(Expr::If)?
} else if input.peek(token::Brace) {
Expr::Block(ExprBlock {
attrs: Vec::new(),
label: None,
block: input.parse()?,
})
} else {
return Err(lookahead.error());
};
Ok((else_token, Box::new(else_branch)))
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprForLoop {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let for_token: Token![for] = input.parse()?;
let pat = pat::parsing::multi_pat_with_leading_vert(input)?;
let in_token: Token![in] = input.parse()?;
let expr: Expr = input.call(Expr::parse_without_eager_brace)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprForLoop {
attrs,
label,
for_token,
pat,
in_token,
expr: Box::new(expr),
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprLoop {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let loop_token: Token![loop] = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprLoop {
attrs,
label,
loop_token,
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprMatch {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let match_token: Token![match] = input.parse()?;
let expr = Expr::parse_without_eager_brace(input)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut arms = Vec::new();
while !content.is_empty() {
arms.push(content.call(Arm::parse)?);
}
Ok(ExprMatch {
attrs,
match_token,
expr: Box::new(expr),
brace_token,
arms,
})
}
}
macro_rules! impl_by_parsing_expr {
(
$(
$expr_type:ty, $variant:ident, $msg:expr,
)*
) => {
$(
#[cfg(all(feature = "full", feature = "printing"))]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for $expr_type {
fn parse(input: ParseStream) -> Result<Self> {
let mut expr: Expr = input.parse()?;
loop {
match expr {
Expr::$variant(inner) => return Ok(inner),
Expr::Group(next) => expr = *next.expr,
_ => return Err(Error::new_spanned(expr, $msg)),
}
}
}
}
)*
};
}
impl_by_parsing_expr! {
ExprAssign, Assign, "expected assignment expression",
ExprAssignOp, AssignOp, "expected compound assignment expression",
ExprAwait, Await, "expected await expression",
ExprBinary, Binary, "expected binary operation",
ExprCall, Call, "expected function call expression",
ExprCast, Cast, "expected cast expression",
ExprField, Field, "expected struct field access",
ExprIndex, Index, "expected indexing expression",
ExprMethodCall, MethodCall, "expected method call expression",
ExprRange, Range, "expected range expression",
ExprTry, Try, "expected try expression",
ExprTuple, Tuple, "expected tuple expression",
ExprType, Type, "expected type ascription expression",
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprBox {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = Vec::new();
let allow_struct = AllowStruct(true);
expr_box(input, attrs, allow_struct)
}
}
#[cfg(feature = "full")]
fn expr_box(
input: ParseStream,
attrs: Vec<Attribute>,
allow_struct: AllowStruct,
) -> Result<ExprBox> {
Ok(ExprBox {
attrs,
box_token: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprUnary {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = Vec::new();
let allow_struct = AllowStruct(true);
expr_unary(input, attrs, allow_struct)
}
}
#[cfg(feature = "full")]
fn expr_unary(
input: ParseStream,
attrs: Vec<Attribute>,
allow_struct: AllowStruct,
) -> Result<ExprUnary> {
Ok(ExprUnary {
attrs,
op: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprClosure {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_closure(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprReference {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
Ok(ExprReference {
attrs: Vec::new(),
and_token: input.parse()?,
raw: Reserved::default(),
mutability: input.parse()?,
expr: Box::new(unary_expr(input, allow_struct)?),
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprBreak {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_break(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprReturn {
fn parse(input: ParseStream) -> Result<Self> {
let allow_struct = AllowStruct(true);
expr_ret(input, allow_struct)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprTryBlock {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprTryBlock {
attrs: Vec::new(),
try_token: input.parse()?,
block: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprYield {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprYield {
attrs: Vec::new(),
yield_token: input.parse()?,
expr: {
if !input.is_empty() && !input.peek(Token![,]) && !input.peek(Token![;]) {
Some(input.parse()?)
} else {
None
}
},
})
}
}
#[cfg(feature = "full")]
fn expr_closure(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprClosure> {
let movability: Option<Token![static]> = input.parse()?;
let asyncness: Option<Token![async]> = input.parse()?;
let capture: Option<Token![move]> = input.parse()?;
let or1_token: Token![|] = input.parse()?;
let mut inputs = Punctuated::new();
loop {
if input.peek(Token![|]) {
break;
}
let value = closure_arg(input)?;
inputs.push_value(value);
if input.peek(Token![|]) {
break;
}
let punct: Token![,] = input.parse()?;
inputs.push_punct(punct);
}
let or2_token: Token![|] = input.parse()?;
let (output, body) = if input.peek(Token![->]) {
let arrow_token: Token![->] = input.parse()?;
let ty: Type = input.parse()?;
let body: Block = input.parse()?;
let output = ReturnType::Type(arrow_token, Box::new(ty));
let block = Expr::Block(ExprBlock {
attrs: Vec::new(),
label: None,
block: body,
});
(output, block)
} else {
let body = ambiguous_expr(input, allow_struct)?;
(ReturnType::Default, body)
};
Ok(ExprClosure {
attrs: Vec::new(),
movability,
asyncness,
capture,
or1_token,
inputs,
or2_token,
output,
body: Box::new(body),
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprAsync {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprAsync {
attrs: Vec::new(),
async_token: input.parse()?,
capture: input.parse()?,
block: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn closure_arg(input: ParseStream) -> Result<Pat> {
let attrs = input.call(Attribute::parse_outer)?;
let mut pat: Pat = input.parse()?;
if input.peek(Token![:]) {
Ok(Pat::Type(PatType {
attrs,
pat: Box::new(pat),
colon_token: input.parse()?,
ty: input.parse()?,
}))
} else {
match &mut pat {
Pat::Box(pat) => pat.attrs = attrs,
Pat::Ident(pat) => pat.attrs = attrs,
Pat::Lit(pat) => pat.attrs = attrs,
Pat::Macro(pat) => pat.attrs = attrs,
Pat::Or(pat) => pat.attrs = attrs,
Pat::Path(pat) => pat.attrs = attrs,
Pat::Range(pat) => pat.attrs = attrs,
Pat::Reference(pat) => pat.attrs = attrs,
Pat::Rest(pat) => pat.attrs = attrs,
Pat::Slice(pat) => pat.attrs = attrs,
Pat::Struct(pat) => pat.attrs = attrs,
Pat::Tuple(pat) => pat.attrs = attrs,
Pat::TupleStruct(pat) => pat.attrs = attrs,
Pat::Type(_) => unreachable!(),
Pat::Verbatim(_) => {}
Pat::Wild(pat) => pat.attrs = attrs,
#[cfg(syn_no_non_exhaustive)]
_ => unreachable!(),
}
Ok(pat)
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprWhile {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let label: Option<Label> = input.parse()?;
let while_token: Token![while] = input.parse()?;
let cond = Expr::parse_without_eager_brace(input)?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ExprWhile {
attrs,
label,
while_token,
cond: Box::new(cond),
body: Block { brace_token, stmts },
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Label {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Label {
name: input.parse()?,
colon_token: input.parse()?,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<Label> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprContinue {
fn parse(input: ParseStream) -> Result<Self> {
Ok(ExprContinue {
attrs: Vec::new(),
continue_token: input.parse()?,
label: input.parse()?,
})
}
}
#[cfg(feature = "full")]
fn expr_break(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprBreak> {
Ok(ExprBreak {
attrs: Vec::new(),
break_token: input.parse()?,
label: input.parse()?,
expr: {
if input.is_empty()
|| input.peek(Token![,])
|| input.peek(Token![;])
|| !allow_struct.0 && input.peek(token::Brace)
{
None
} else {
let expr = ambiguous_expr(input, allow_struct)?;
Some(Box::new(expr))
}
},
})
}
#[cfg(feature = "full")]
fn expr_ret(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprReturn> {
Ok(ExprReturn {
attrs: Vec::new(),
return_token: input.parse()?,
expr: {
if input.is_empty() || input.peek(Token![,]) || input.peek(Token![;]) {
None
} else {
// NOTE: return is greedy and eats blocks after it even when in a
// position where structs are not allowed, such as in if statement
// conditions. For example:
//
// if return { println!("A") } {} // Prints "A"
let expr = ambiguous_expr(input, allow_struct)?;
Some(Box::new(expr))
}
},
})
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for FieldValue {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let member: Member = input.parse()?;
let (colon_token, value) = if input.peek(Token![:]) || !member.is_named() {
let colon_token: Token![:] = input.parse()?;
let value: Expr = input.parse()?;
(Some(colon_token), value)
} else if let Member::Named(ident) = &member {
let value = Expr::Path(ExprPath {
attrs: Vec::new(),
qself: None,
path: Path::from(ident.clone()),
});
(None, value)
} else {
unreachable!()
};
Ok(FieldValue {
attrs,
member,
colon_token,
expr: value,
})
}
}
#[cfg(feature = "full")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ExprStruct {
fn parse(input: ParseStream) -> Result<Self> {
let path: Path = input.parse()?;
expr_struct_helper(input, path)
}
}
#[cfg(feature = "full")]
fn expr_struct_helper(input: ParseStream, path: Path) -> Result<ExprStruct> {
let content;
let brace_token = braced!(content in input);
let mut fields = Punctuated::new();
while !content.is_empty() {
if content.peek(Token![..]) {
return Ok(ExprStruct {
attrs: Vec::new(),
brace_token,
path,
fields,
dot2_token: Some(content.parse()?),
rest: if content.is_empty() {
None
} else {
Some(Box::new(content.parse()?))
},
});
}
fields.push(content.parse()?);
if content.is_empty() {
break;
}
let punct: Token![,] = content.parse()?;
fields.push_punct(punct);
}
Ok(ExprStruct {
attrs: Vec::new(),
brace_token,
path,
fields,
dot2_token: None,
rest: None,
})
}src/generics.rs (line 646)
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fn parse(input: ParseStream) -> Result<Self> {
if !input.peek(Token![<]) {
return Ok(Generics::default());
}
let lt_token: Token![<] = input.parse()?;
let mut params = Punctuated::new();
loop {
if input.peek(Token![>]) {
break;
}
let attrs = input.call(Attribute::parse_outer)?;
let lookahead = input.lookahead1();
if lookahead.peek(Lifetime) {
params.push_value(GenericParam::Lifetime(LifetimeDef {
attrs,
..input.parse()?
}));
} else if lookahead.peek(Ident) {
params.push_value(GenericParam::Type(TypeParam {
attrs,
..input.parse()?
}));
} else if lookahead.peek(Token![const]) {
params.push_value(GenericParam::Const(ConstParam {
attrs,
..input.parse()?
}));
} else if input.peek(Token![_]) {
params.push_value(GenericParam::Type(TypeParam {
attrs,
ident: input.call(Ident::parse_any)?,
colon_token: None,
bounds: Punctuated::new(),
eq_token: None,
default: None,
}));
} else {
return Err(lookahead.error());
}
if input.peek(Token![>]) {
break;
}
let punct = input.parse()?;
params.push_punct(punct);
}
let gt_token: Token![>] = input.parse()?;
Ok(Generics {
lt_token: Some(lt_token),
params,
gt_token: Some(gt_token),
where_clause: None,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for GenericParam {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let lookahead = input.lookahead1();
if lookahead.peek(Ident) {
Ok(GenericParam::Type(TypeParam {
attrs,
..input.parse()?
}))
} else if lookahead.peek(Lifetime) {
Ok(GenericParam::Lifetime(LifetimeDef {
attrs,
..input.parse()?
}))
} else if lookahead.peek(Token![const]) {
Ok(GenericParam::Const(ConstParam {
attrs,
..input.parse()?
}))
} else {
Err(lookahead.error())
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for LifetimeDef {
fn parse(input: ParseStream) -> Result<Self> {
let has_colon;
Ok(LifetimeDef {
attrs: input.call(Attribute::parse_outer)?,
lifetime: input.parse()?,
colon_token: {
if input.peek(Token![:]) {
has_colon = true;
Some(input.parse()?)
} else {
has_colon = false;
None
}
},
bounds: {
let mut bounds = Punctuated::new();
if has_colon {
loop {
if input.peek(Token![,]) || input.peek(Token![>]) {
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
}
bounds
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for BoundLifetimes {
fn parse(input: ParseStream) -> Result<Self> {
Ok(BoundLifetimes {
for_token: input.parse()?,
lt_token: input.parse()?,
lifetimes: {
let mut lifetimes = Punctuated::new();
while !input.peek(Token![>]) {
lifetimes.push_value(input.parse()?);
if input.peek(Token![>]) {
break;
}
lifetimes.push_punct(input.parse()?);
}
lifetimes
},
gt_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<BoundLifetimes> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![for]) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeParam {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let ident: Ident = input.parse()?;
let colon_token: Option<Token![:]> = input.parse()?;
let begin_bound = input.fork();
let mut is_maybe_const = false;
let mut bounds = Punctuated::new();
if colon_token.is_some() {
loop {
if input.peek(Token![,]) || input.peek(Token![>]) || input.peek(Token![=]) {
break;
}
if input.peek(Token![~]) && input.peek2(Token![const]) {
input.parse::<Token![~]>()?;
input.parse::<Token![const]>()?;
is_maybe_const = true;
}
let value: TypeParamBound = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct: Token![+] = input.parse()?;
bounds.push_punct(punct);
}
}
let mut eq_token: Option<Token![=]> = input.parse()?;
let mut default = if eq_token.is_some() {
Some(input.parse::<Type>()?)
} else {
None
};
if is_maybe_const {
bounds.clear();
eq_token = None;
default = Some(Type::Verbatim(verbatim::between(begin_bound, input)));
}
Ok(TypeParam {
attrs,
ident,
colon_token,
bounds,
eq_token,
default,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeParamBound {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) {
return input.parse().map(TypeParamBound::Lifetime);
}
if input.peek(token::Paren) {
let content;
let paren_token = parenthesized!(content in input);
let mut bound: TraitBound = content.parse()?;
bound.paren_token = Some(paren_token);
return Ok(TypeParamBound::Trait(bound));
}
input.parse().map(TypeParamBound::Trait)
}
}
impl TypeParamBound {
pub(crate) fn parse_multiple(
input: ParseStream,
allow_plus: bool,
) -> Result<Punctuated<Self, Token![+]>> {
let mut bounds = Punctuated::new();
loop {
bounds.push_value(input.parse()?);
if !(allow_plus && input.peek(Token![+])) {
break;
}
bounds.push_punct(input.parse()?);
if !(input.peek(Ident::peek_any)
|| input.peek(Token![::])
|| input.peek(Token![?])
|| input.peek(Lifetime)
|| input.peek(token::Paren))
{
break;
}
}
Ok(bounds)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitBound {
fn parse(input: ParseStream) -> Result<Self> {
#[cfg(feature = "full")]
let tilde_const = if input.peek(Token![~]) && input.peek2(Token![const]) {
let tilde_token = input.parse::<Token![~]>()?;
let const_token = input.parse::<Token![const]>()?;
Some((tilde_token, const_token))
} else {
None
};
let modifier: TraitBoundModifier = input.parse()?;
let lifetimes: Option<BoundLifetimes> = input.parse()?;
let mut path: Path = input.parse()?;
if path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
}
#[cfg(feature = "full")]
{
if let Some((tilde_token, const_token)) = tilde_const {
path.segments.insert(
0,
PathSegment {
ident: Ident::new("const", const_token.span),
arguments: PathArguments::None,
},
);
let (_const, punct) = path.segments.pairs_mut().next().unwrap().into_tuple();
*punct.unwrap() = Token;
}
}
Ok(TraitBound {
paren_token: None,
modifier,
lifetimes,
path,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TraitBoundModifier {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![?]) {
input.parse().map(TraitBoundModifier::Maybe)
} else {
Ok(TraitBoundModifier::None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ConstParam {
fn parse(input: ParseStream) -> Result<Self> {
let mut default = None;
Ok(ConstParam {
attrs: input.call(Attribute::parse_outer)?,
const_token: input.parse()?,
ident: input.parse()?,
colon_token: input.parse()?,
ty: input.parse()?,
eq_token: {
if input.peek(Token![=]) {
let eq_token = input.parse()?;
default = Some(path::parsing::const_argument(input)?);
Some(eq_token)
} else {
None
}
},
default,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for WhereClause {
fn parse(input: ParseStream) -> Result<Self> {
Ok(WhereClause {
where_token: input.parse()?,
predicates: {
let mut predicates = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
predicates.push_value(value);
if !input.peek(Token![,]) {
break;
}
let punct = input.parse()?;
predicates.push_punct(punct);
}
predicates
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<WhereClause> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![where]) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for WherePredicate {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Lifetime) && input.peek2(Token![:]) {
Ok(WherePredicate::Lifetime(PredicateLifetime {
lifetime: input.parse()?,
colon_token: input.parse()?,
bounds: {
let mut bounds = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
bounds
},
}))
} else {
Ok(WherePredicate::Type(PredicateType {
lifetimes: input.parse()?,
bounded_ty: input.parse()?,
colon_token: input.parse()?,
bounds: {
let mut bounds = Punctuated::new();
loop {
if input.is_empty()
|| input.peek(token::Brace)
|| input.peek(Token![,])
|| input.peek(Token![;])
|| input.peek(Token![:]) && !input.peek(Token![::])
|| input.peek(Token![=])
{
break;
}
let value = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct = input.parse()?;
bounds.push_punct(punct);
}
bounds
},
}))
}
}Additional examples can be found in:
sourcepub fn pop(&mut self) -> Option<Pair<T, P>>
pub fn pop(&mut self) -> Option<Pair<T, P>>
Removes the last punctuated pair from this sequence, or None if the
sequence is empty.
Examples found in repository?
src/item.rs (line 1464)
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fn pop_variadic(args: &mut Punctuated<FnArg, Token![,]>) -> Option<Variadic> {
let trailing_punct = args.trailing_punct();
let last = match args.last_mut()? {
FnArg::Typed(last) => last,
_ => return None,
};
let ty = match last.ty.as_ref() {
Type::Verbatim(ty) => ty,
_ => return None,
};
let mut variadic = Variadic {
attrs: Vec::new(),
dots: parse2(ty.clone()).ok()?,
};
if let Pat::Verbatim(pat) = last.pat.as_ref() {
if pat.to_string() == "..." && !trailing_punct {
variadic.attrs = mem::replace(&mut last.attrs, Vec::new());
args.pop();
}
}
Some(variadic)
}sourcepub fn trailing_punct(&self) -> bool
pub fn trailing_punct(&self) -> bool
Determines whether this punctuated sequence ends with a trailing punctuation.
Examples found in repository?
More examples
src/item.rs (line 1444)
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fn pop_variadic(args: &mut Punctuated<FnArg, Token![,]>) -> Option<Variadic> {
let trailing_punct = args.trailing_punct();
let last = match args.last_mut()? {
FnArg::Typed(last) => last,
_ => return None,
};
let ty = match last.ty.as_ref() {
Type::Verbatim(ty) => ty,
_ => return None,
};
let mut variadic = Variadic {
attrs: Vec::new(),
dots: parse2(ty.clone()).ok()?,
};
if let Pat::Verbatim(pat) = last.pat.as_ref() {
if pat.to_string() == "..." && !trailing_punct {
variadic.attrs = mem::replace(&mut last.attrs, Vec::new());
args.pop();
}
}
Some(variadic)
}src/attr.rs (line 549)
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fn parse_meta_path(input: ParseStream) -> Result<Path> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
while input.peek(Ident::peek_any) {
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}src/path.rs (line 530)
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pub fn parse_mod_style(input: ParseStream) -> Result<Self> {
Ok(Path {
leading_colon: input.parse()?,
segments: {
let mut segments = Punctuated::new();
loop {
if !input.peek(Ident)
&& !input.peek(Token![super])
&& !input.peek(Token![self])
&& !input.peek(Token![Self])
&& !input.peek(Token![crate])
{
break;
}
let ident = Ident::parse_any(input)?;
segments.push_value(PathSegment::from(ident));
if !input.peek(Token![::]) {
break;
}
let punct = input.parse()?;
segments.push_punct(punct);
}
if segments.is_empty() {
return Err(input.error("expected path"));
} else if segments.trailing_punct() {
return Err(input.error("expected path segment"));
}
segments
},
})
}src/ty.rs (line 492)
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pub(crate) fn ambig_ty(
input: ParseStream,
allow_plus: bool,
allow_group_generic: bool,
) -> Result<Type> {
let begin = input.fork();
if input.peek(token::Group) {
let mut group: TypeGroup = input.parse()?;
if input.peek(Token![::]) && input.peek3(Ident::peek_any) {
if let Type::Path(mut ty) = *group.elem {
Path::parse_rest(input, &mut ty.path, false)?;
return Ok(Type::Path(ty));
} else {
return Ok(Type::Path(TypePath {
qself: Some(QSelf {
lt_token: Token,
position: 0,
as_token: None,
gt_token: Token,
ty: group.elem,
}),
path: Path::parse_helper(input, false)?,
}));
}
} else if input.peek(Token![<]) && allow_group_generic
|| input.peek(Token![::]) && input.peek3(Token![<])
{
if let Type::Path(mut ty) = *group.elem {
let arguments = &mut ty.path.segments.last_mut().unwrap().arguments;
if let PathArguments::None = arguments {
*arguments = PathArguments::AngleBracketed(input.parse()?);
Path::parse_rest(input, &mut ty.path, false)?;
return Ok(Type::Path(ty));
} else {
group.elem = Box::new(Type::Path(ty));
}
}
}
return Ok(Type::Group(group));
}
let mut lifetimes = None::<BoundLifetimes>;
let mut lookahead = input.lookahead1();
if lookahead.peek(Token![for]) {
lifetimes = input.parse()?;
lookahead = input.lookahead1();
if !lookahead.peek(Ident)
&& !lookahead.peek(Token![fn])
&& !lookahead.peek(Token![unsafe])
&& !lookahead.peek(Token![extern])
&& !lookahead.peek(Token![super])
&& !lookahead.peek(Token![self])
&& !lookahead.peek(Token![Self])
&& !lookahead.peek(Token![crate])
|| input.peek(Token![dyn])
{
return Err(lookahead.error());
}
}
if lookahead.peek(token::Paren) {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(Type::Tuple(TypeTuple {
paren_token,
elems: Punctuated::new(),
}));
}
if content.peek(Lifetime) {
return Ok(Type::Paren(TypeParen {
paren_token,
elem: Box::new(Type::TraitObject(content.parse()?)),
}));
}
if content.peek(Token![?]) {
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds: {
let mut bounds = Punctuated::new();
bounds.push_value(TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
..content.parse()?
}));
while let Some(plus) = input.parse()? {
bounds.push_punct(plus);
bounds.push_value(input.parse()?);
}
bounds
},
}));
}
let mut first: Type = content.parse()?;
if content.peek(Token![,]) {
return Ok(Type::Tuple(TypeTuple {
paren_token,
elems: {
let mut elems = Punctuated::new();
elems.push_value(first);
elems.push_punct(content.parse()?);
while !content.is_empty() {
elems.push_value(content.parse()?);
if content.is_empty() {
break;
}
elems.push_punct(content.parse()?);
}
elems
},
}));
}
if allow_plus && input.peek(Token![+]) {
loop {
let first = match first {
Type::Path(TypePath { qself: None, path }) => {
TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
modifier: TraitBoundModifier::None,
lifetimes: None,
path,
})
}
Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
}) => {
if bounds.len() > 1 || bounds.trailing_punct() {
first = Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
});
break;
}
match bounds.into_iter().next().unwrap() {
TypeParamBound::Trait(trait_bound) => {
TypeParamBound::Trait(TraitBound {
paren_token: Some(paren_token),
..trait_bound
})
}
other @ TypeParamBound::Lifetime(_) => other,
}
}
_ => break,
};
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds: {
let mut bounds = Punctuated::new();
bounds.push_value(first);
while let Some(plus) = input.parse()? {
bounds.push_punct(plus);
bounds.push_value(input.parse()?);
}
bounds
},
}));
}
}
Ok(Type::Paren(TypeParen {
paren_token,
elem: Box::new(first),
}))
} else if lookahead.peek(Token![fn])
|| lookahead.peek(Token![unsafe])
|| lookahead.peek(Token![extern])
{
let allow_mut_self = true;
if let Some(mut bare_fn) = parse_bare_fn(input, allow_mut_self)? {
bare_fn.lifetimes = lifetimes;
Ok(Type::BareFn(bare_fn))
} else {
Ok(Type::Verbatim(verbatim::between(begin, input)))
}
} else if lookahead.peek(Ident)
|| input.peek(Token![super])
|| input.peek(Token![self])
|| input.peek(Token![Self])
|| input.peek(Token![crate])
|| lookahead.peek(Token![::])
|| lookahead.peek(Token![<])
{
let dyn_token: Option<Token![dyn]> = input.parse()?;
if let Some(dyn_token) = dyn_token {
let dyn_span = dyn_token.span;
let star_token: Option<Token![*]> = input.parse()?;
let bounds = TypeTraitObject::parse_bounds(dyn_span, input, allow_plus)?;
return Ok(if star_token.is_some() {
Type::Verbatim(verbatim::between(begin, input))
} else {
Type::TraitObject(TypeTraitObject {
dyn_token: Some(dyn_token),
bounds,
})
});
}
let ty: TypePath = input.parse()?;
if ty.qself.is_some() {
return Ok(Type::Path(ty));
}
if input.peek(Token![!]) && !input.peek(Token![!=]) {
let mut contains_arguments = false;
for segment in &ty.path.segments {
match segment.arguments {
PathArguments::None => {}
PathArguments::AngleBracketed(_) | PathArguments::Parenthesized(_) => {
contains_arguments = true;
}
}
}
if !contains_arguments {
let bang_token: Token![!] = input.parse()?;
let (delimiter, tokens) = mac::parse_delimiter(input)?;
return Ok(Type::Macro(TypeMacro {
mac: Macro {
path: ty.path,
bang_token,
delimiter,
tokens,
},
}));
}
}
if lifetimes.is_some() || allow_plus && input.peek(Token![+]) {
let mut bounds = Punctuated::new();
bounds.push_value(TypeParamBound::Trait(TraitBound {
paren_token: None,
modifier: TraitBoundModifier::None,
lifetimes,
path: ty.path,
}));
if allow_plus {
while input.peek(Token![+]) {
bounds.push_punct(input.parse()?);
if !(input.peek(Ident::peek_any)
|| input.peek(Token![::])
|| input.peek(Token![?])
|| input.peek(Lifetime)
|| input.peek(token::Paren))
{
break;
}
bounds.push_value(input.parse()?);
}
}
return Ok(Type::TraitObject(TypeTraitObject {
dyn_token: None,
bounds,
}));
}
Ok(Type::Path(ty))
} else if lookahead.peek(token::Bracket) {
let content;
let bracket_token = bracketed!(content in input);
let elem: Type = content.parse()?;
if content.peek(Token![;]) {
Ok(Type::Array(TypeArray {
bracket_token,
elem: Box::new(elem),
semi_token: content.parse()?,
len: content.parse()?,
}))
} else {
Ok(Type::Slice(TypeSlice {
bracket_token,
elem: Box::new(elem),
}))
}
} else if lookahead.peek(Token![*]) {
input.parse().map(Type::Ptr)
} else if lookahead.peek(Token![&]) {
input.parse().map(Type::Reference)
} else if lookahead.peek(Token![!]) && !input.peek(Token![=]) {
input.parse().map(Type::Never)
} else if lookahead.peek(Token![impl]) {
TypeImplTrait::parse(input, allow_plus).map(Type::ImplTrait)
} else if lookahead.peek(Token![_]) {
input.parse().map(Type::Infer)
} else if lookahead.peek(Lifetime) {
input.parse().map(Type::TraitObject)
} else {
Err(lookahead.error())
}
}sourcepub fn empty_or_trailing(&self) -> bool
pub fn empty_or_trailing(&self) -> bool
Returns true if either this Punctuated is empty, or it has a trailing
punctuation.
Equivalent to punctuated.is_empty() || punctuated.trailing_punct().
Examples found in repository?
src/punctuated.rs (line 167)
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pub fn push_value(&mut self, value: T) {
assert!(
self.empty_or_trailing(),
"Punctuated::push_value: cannot push value if Punctuated is missing trailing punctuation",
);
self.last = Some(Box::new(value));
}
/// Appends a trailing punctuation onto the end of this punctuated sequence.
/// The sequence must be non-empty and must not already have trailing
/// punctuation.
///
/// # Panics
///
/// Panics if the sequence is empty or already has a trailing punctuation.
pub fn push_punct(&mut self, punctuation: P) {
assert!(
self.last.is_some(),
"Punctuated::push_punct: cannot push punctuation if Punctuated is empty or already has trailing punctuation",
);
let last = self.last.take().unwrap();
self.inner.push((*last, punctuation));
}
/// Removes the last punctuated pair from this sequence, or `None` if the
/// sequence is empty.
pub fn pop(&mut self) -> Option<Pair<T, P>> {
if self.last.is_some() {
self.last.take().map(|t| Pair::End(*t))
} else {
self.inner.pop().map(|(t, p)| Pair::Punctuated(t, p))
}
}
/// Determines whether this punctuated sequence ends with a trailing
/// punctuation.
pub fn trailing_punct(&self) -> bool {
self.last.is_none() && !self.is_empty()
}
/// Returns true if either this `Punctuated` is empty, or it has a trailing
/// punctuation.
///
/// Equivalent to `punctuated.is_empty() || punctuated.trailing_punct()`.
pub fn empty_or_trailing(&self) -> bool {
self.last.is_none()
}
/// Appends a syntax tree node onto the end of this punctuated sequence.
///
/// If there is not a trailing punctuation in this sequence when this method
/// is called, the default value of punctuation type `P` is inserted before
/// the given value of type `T`.
pub fn push(&mut self, value: T)
where
P: Default,
{
if !self.empty_or_trailing() {
self.push_punct(Default::default());
}
self.push_value(value);
}
/// Inserts an element at position `index`.
///
/// # Panics
///
/// Panics if `index` is greater than the number of elements previously in
/// this punctuated sequence.
pub fn insert(&mut self, index: usize, value: T)
where
P: Default,
{
assert!(
index <= self.len(),
"Punctuated::insert: index out of range",
);
if index == self.len() {
self.push(value);
} else {
self.inner.insert(index, (value, Default::default()));
}
}
/// Clears the sequence of all values and punctuation, making it empty.
pub fn clear(&mut self) {
self.inner.clear();
self.last = None;
}
/// Parses zero or more occurrences of `T` separated by punctuation of type
/// `P`, with optional trailing punctuation.
///
/// Parsing continues until the end of this parse stream. The entire content
/// of this parse stream must consist of `T` and `P`.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Parse,
{
Self::parse_terminated_with(input, T::parse)
}
/// Parses zero or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, with optional trailing
/// punctuation.
///
/// Like [`parse_terminated`], the entire content of this stream is expected
/// to be parsed.
///
/// [`parse_terminated`]: Punctuated::parse_terminated
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
}
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<T, P> Clone for Punctuated<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
Punctuated {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Eq for Punctuated<T, P>
where
T: Eq,
P: Eq,
{
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> PartialEq for Punctuated<T, P>
where
T: PartialEq,
P: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
let Punctuated { inner, last } = self;
*inner == other.inner && *last == other.last
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Hash for Punctuated<T, P>
where
T: Hash,
P: Hash,
{
fn hash<H: Hasher>(&self, state: &mut H) {
let Punctuated { inner, last } = self;
inner.hash(state);
last.hash(state);
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut list = f.debug_list();
for (t, p) in &self.inner {
list.entry(t);
list.entry(p);
}
if let Some(last) = &self.last {
list.entry(last);
}
list.finish()
}
}
impl<T, P> FromIterator<T> for Punctuated<T, P>
where
P: Default,
{
fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<T> for Punctuated<T, P>
where
P: Default,
{
fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
for value in i {
self.push(value);
}
}
}
impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P> {
fn from_iter<I: IntoIterator<Item = Pair<T, P>>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P> {
fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I) {
assert!(
self.empty_or_trailing(),
"Punctuated::extend: Punctuated is not empty or does not have a trailing punctuation",
);
let mut nomore = false;
for pair in i {
if nomore {
panic!("Punctuated extended with items after a Pair::End");
}
match pair {
Pair::Punctuated(a, b) => self.inner.push((a, b)),
Pair::End(a) => {
self.last = Some(Box::new(a));
nomore = true;
}
}
}
}More examples
src/pat.rs (line 799)
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fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.path.to_tokens(tokens);
self.brace_token.surround(tokens, |tokens| {
self.fields.to_tokens(tokens);
// NOTE: We need a comma before the dot2 token if it is present.
if !self.fields.empty_or_trailing() && self.dot2_token.is_some() {
<Token![,]>::default().to_tokens(tokens);
}
self.dot2_token.to_tokens(tokens);
});
}src/item.rs (line 3290)
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fn to_tokens(&self, tokens: &mut TokenStream) {
self.constness.to_tokens(tokens);
self.asyncness.to_tokens(tokens);
self.unsafety.to_tokens(tokens);
self.abi.to_tokens(tokens);
self.fn_token.to_tokens(tokens);
self.ident.to_tokens(tokens);
self.generics.to_tokens(tokens);
self.paren_token.surround(tokens, |tokens| {
let mut last_is_variadic = false;
for pair in self.inputs.pairs() {
last_is_variadic = maybe_variadic_to_tokens(pair.value(), tokens);
pair.punct().to_tokens(tokens);
}
if self.variadic.is_some() && !last_is_variadic {
if !self.inputs.empty_or_trailing() {
<Token![,]>::default().to_tokens(tokens);
}
self.variadic.to_tokens(tokens);
}
});
self.output.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
}src/ty.rs (line 741)
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fn parse_bare_fn(input: ParseStream, allow_mut_self: bool) -> Result<Option<TypeBareFn>> {
let args;
let mut variadic = None;
let mut has_mut_self = false;
let bare_fn = TypeBareFn {
lifetimes: input.parse()?,
unsafety: input.parse()?,
abi: input.parse()?,
fn_token: input.parse()?,
paren_token: parenthesized!(args in input),
inputs: {
let mut inputs = Punctuated::new();
while !args.is_empty() {
let attrs = args.call(Attribute::parse_outer)?;
if inputs.empty_or_trailing() && args.peek(Token![...]) {
variadic = Some(Variadic {
attrs,
dots: args.parse()?,
});
break;
}
if let Some(arg) = parse_bare_fn_arg(&args, allow_mut_self)? {
inputs.push_value(BareFnArg { attrs, ..arg });
} else {
has_mut_self = true;
}
if args.is_empty() {
break;
}
let comma = args.parse()?;
if !has_mut_self {
inputs.push_punct(comma);
}
}
inputs
},
variadic,
output: input.call(ReturnType::without_plus)?,
};
if has_mut_self {
Ok(None)
} else {
Ok(Some(bare_fn))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeNever {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TypeNever {
bang_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeInfer {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TypeInfer {
underscore_token: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeTuple {
fn parse(input: ParseStream) -> Result<Self> {
let content;
let paren_token = parenthesized!(content in input);
if content.is_empty() {
return Ok(TypeTuple {
paren_token,
elems: Punctuated::new(),
});
}
let first: Type = content.parse()?;
Ok(TypeTuple {
paren_token,
elems: {
let mut elems = Punctuated::new();
elems.push_value(first);
elems.push_punct(content.parse()?);
while !content.is_empty() {
elems.push_value(content.parse()?);
if content.is_empty() {
break;
}
elems.push_punct(content.parse()?);
}
elems
},
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeMacro {
fn parse(input: ParseStream) -> Result<Self> {
Ok(TypeMacro {
mac: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypePath {
fn parse(input: ParseStream) -> Result<Self> {
let expr_style = false;
let (qself, mut path) = path::parsing::qpath(input, expr_style)?;
while path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let allow_associated_type = cfg!(feature = "full")
&& match &args.output {
ReturnType::Default => true,
ReturnType::Type(_, ty) => match **ty {
// TODO: probably some of the other kinds allow this too.
Type::Paren(_) => true,
_ => false,
},
};
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
if allow_associated_type {
Path::parse_rest(input, &mut path, expr_style)?;
}
}
Ok(TypePath { qself, path })
}
}
impl ReturnType {
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn without_plus(input: ParseStream) -> Result<Self> {
let allow_plus = false;
Self::parse(input, allow_plus)
}
pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
if input.peek(Token![->]) {
let arrow = input.parse()?;
let allow_group_generic = true;
let ty = ambig_ty(input, allow_plus, allow_group_generic)?;
Ok(ReturnType::Type(arrow, Box::new(ty)))
} else {
Ok(ReturnType::Default)
}
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for ReturnType {
fn parse(input: ParseStream) -> Result<Self> {
let allow_plus = true;
Self::parse(input, allow_plus)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeTraitObject {
fn parse(input: ParseStream) -> Result<Self> {
let allow_plus = true;
Self::parse(input, allow_plus)
}
}
impl TypeTraitObject {
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn without_plus(input: ParseStream) -> Result<Self> {
let allow_plus = false;
Self::parse(input, allow_plus)
}
// Only allow multiple trait references if allow_plus is true.
pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
let dyn_token: Option<Token![dyn]> = input.parse()?;
let dyn_span = match &dyn_token {
Some(token) => token.span,
None => input.span(),
};
let bounds = Self::parse_bounds(dyn_span, input, allow_plus)?;
Ok(TypeTraitObject { dyn_token, bounds })
}
fn parse_bounds(
dyn_span: Span,
input: ParseStream,
allow_plus: bool,
) -> Result<Punctuated<TypeParamBound, Token![+]>> {
let bounds = TypeParamBound::parse_multiple(input, allow_plus)?;
let mut last_lifetime_span = None;
let mut at_least_one_trait = false;
for bound in &bounds {
match bound {
TypeParamBound::Trait(_) => {
at_least_one_trait = true;
break;
}
TypeParamBound::Lifetime(lifetime) => {
last_lifetime_span = Some(lifetime.ident.span());
}
}
}
// Just lifetimes like `'a + 'b` is not a TraitObject.
if !at_least_one_trait {
let msg = "at least one trait is required for an object type";
return Err(error::new2(dyn_span, last_lifetime_span.unwrap(), msg));
}
Ok(bounds)
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeImplTrait {
fn parse(input: ParseStream) -> Result<Self> {
let allow_plus = true;
Self::parse(input, allow_plus)
}
}
impl TypeImplTrait {
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn without_plus(input: ParseStream) -> Result<Self> {
let allow_plus = false;
Self::parse(input, allow_plus)
}
pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
let impl_token: Token![impl] = input.parse()?;
let bounds = TypeParamBound::parse_multiple(input, allow_plus)?;
let mut last_lifetime_span = None;
let mut at_least_one_trait = false;
for bound in &bounds {
match bound {
TypeParamBound::Trait(_) => {
at_least_one_trait = true;
break;
}
TypeParamBound::Lifetime(lifetime) => {
last_lifetime_span = Some(lifetime.ident.span());
}
}
}
if !at_least_one_trait {
let msg = "at least one trait must be specified";
return Err(error::new2(
impl_token.span,
last_lifetime_span.unwrap(),
msg,
));
}
Ok(TypeImplTrait { impl_token, bounds })
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeGroup {
fn parse(input: ParseStream) -> Result<Self> {
let group = crate::group::parse_group(input)?;
Ok(TypeGroup {
group_token: group.token,
elem: group.content.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for TypeParen {
fn parse(input: ParseStream) -> Result<Self> {
let allow_plus = false;
Self::parse(input, allow_plus)
}
}
impl TypeParen {
fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
let content;
Ok(TypeParen {
paren_token: parenthesized!(content in input),
elem: Box::new({
let allow_group_generic = true;
ambig_ty(&content, allow_plus, allow_group_generic)?
}),
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for BareFnArg {
fn parse(input: ParseStream) -> Result<Self> {
let allow_mut_self = false;
parse_bare_fn_arg(input, allow_mut_self).map(Option::unwrap)
}
}
fn parse_bare_fn_arg(
input: ParseStream,
mut allow_mut_self: bool,
) -> Result<Option<BareFnArg>> {
let mut has_mut_self = false;
let arg = BareFnArg {
attrs: input.call(Attribute::parse_outer)?,
name: {
if (input.peek(Ident) || input.peek(Token![_]) || input.peek(Token![self]))
&& input.peek2(Token![:])
&& !input.peek2(Token![::])
{
let name = input.call(Ident::parse_any)?;
let colon: Token![:] = input.parse()?;
Some((name, colon))
} else if allow_mut_self
&& input.peek(Token![mut])
&& input.peek2(Token![self])
&& input.peek3(Token![:])
&& !input.peek3(Token![::])
{
has_mut_self = true;
allow_mut_self = false;
input.parse::<Token![mut]>()?;
input.parse::<Token![self]>()?;
input.parse::<Token![:]>()?;
None
} else {
None
}
},
ty: if !has_mut_self && input.peek(Token![...]) {
let dot3 = input.parse::<Token![...]>()?;
let args = vec![
TokenTree::Punct(Punct::new('.', Spacing::Joint)),
TokenTree::Punct(Punct::new('.', Spacing::Joint)),
TokenTree::Punct(Punct::new('.', Spacing::Alone)),
];
let tokens: TokenStream = args
.into_iter()
.zip(&dot3.spans)
.map(|(mut arg, span)| {
arg.set_span(*span);
arg
})
.collect();
Type::Verbatim(tokens)
} else if allow_mut_self && input.peek(Token![mut]) && input.peek2(Token![self]) {
has_mut_self = true;
input.parse::<Token![mut]>()?;
Type::Path(TypePath {
qself: None,
path: input.parse::<Token![self]>()?.into(),
})
} else {
input.parse()?
},
};
if has_mut_self {
Ok(None)
} else {
Ok(Some(arg))
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Abi {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Abi {
extern_token: input.parse()?,
name: input.parse()?,
})
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
impl Parse for Option<Abi> {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek(Token![extern]) {
input.parse().map(Some)
} else {
Ok(None)
}
}
}
}
#[cfg(feature = "printing")]
mod printing {
use super::*;
use crate::attr::FilterAttrs;
use crate::print::TokensOrDefault;
use proc_macro2::TokenStream;
use quote::{ToTokens, TokenStreamExt};
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TypeSlice {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.bracket_token.surround(tokens, |tokens| {
self.elem.to_tokens(tokens);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TypeArray {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.bracket_token.surround(tokens, |tokens| {
self.elem.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
self.len.to_tokens(tokens);
});
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TypePtr {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.star_token.to_tokens(tokens);
match &self.mutability {
Some(tok) => tok.to_tokens(tokens),
None => {
TokensOrDefault(&self.const_token).to_tokens(tokens);
}
}
self.elem.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TypeReference {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.and_token.to_tokens(tokens);
self.lifetime.to_tokens(tokens);
self.mutability.to_tokens(tokens);
self.elem.to_tokens(tokens);
}
}
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for TypeBareFn {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.lifetimes.to_tokens(tokens);
self.unsafety.to_tokens(tokens);
self.abi.to_tokens(tokens);
self.fn_token.to_tokens(tokens);
self.paren_token.surround(tokens, |tokens| {
self.inputs.to_tokens(tokens);
if let Some(variadic) = &self.variadic {
if !self.inputs.empty_or_trailing() {
let span = variadic.dots.spans[0];
Token.to_tokens(tokens);
}
variadic.to_tokens(tokens);
}
});
self.output.to_tokens(tokens);
}sourcepub fn push(&mut self, value: T)where
P: Default,
pub fn push(&mut self, value: T)where
P: Default,
Appends a syntax tree node onto the end of this punctuated sequence.
If there is not a trailing punctuation in this sequence when this method
is called, the default value of punctuation type P is inserted before
the given value of type T.
Examples found in repository?
src/punctuated.rs (line 246)
236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456
pub fn insert(&mut self, index: usize, value: T)
where
P: Default,
{
assert!(
index <= self.len(),
"Punctuated::insert: index out of range",
);
if index == self.len() {
self.push(value);
} else {
self.inner.insert(index, (value, Default::default()));
}
}
/// Clears the sequence of all values and punctuation, making it empty.
pub fn clear(&mut self) {
self.inner.clear();
self.last = None;
}
/// Parses zero or more occurrences of `T` separated by punctuation of type
/// `P`, with optional trailing punctuation.
///
/// Parsing continues until the end of this parse stream. The entire content
/// of this parse stream must consist of `T` and `P`.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Parse,
{
Self::parse_terminated_with(input, T::parse)
}
/// Parses zero or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, with optional trailing
/// punctuation.
///
/// Like [`parse_terminated`], the entire content of this stream is expected
/// to be parsed.
///
/// [`parse_terminated`]: Punctuated::parse_terminated
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_terminated_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Parse,
{
let mut punctuated = Punctuated::new();
loop {
if input.is_empty() {
break;
}
let value = parser(input)?;
punctuated.push_value(value);
if input.is_empty() {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
/// Parses one or more occurrences of `T` separated by punctuation of type
/// `P`, not accepting trailing punctuation.
///
/// Parsing continues as long as punctuation `P` is present at the head of
/// the stream. This method returns upon parsing a `T` and observing that it
/// is not followed by a `P`, even if there are remaining tokens in the
/// stream.
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty(input: ParseStream) -> Result<Self>
where
T: Parse,
P: Token + Parse,
{
Self::parse_separated_nonempty_with(input, T::parse)
}
/// Parses one or more occurrences of `T` using the given parse function,
/// separated by punctuation of type `P`, not accepting trailing
/// punctuation.
///
/// Like [`parse_separated_nonempty`], may complete early without parsing
/// the entire content of this stream.
///
/// [`parse_separated_nonempty`]: Punctuated::parse_separated_nonempty
///
/// *This function is available only if Syn is built with the `"parsing"`
/// feature.*
#[cfg(feature = "parsing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
pub fn parse_separated_nonempty_with(
input: ParseStream,
parser: fn(ParseStream) -> Result<T>,
) -> Result<Self>
where
P: Token + Parse,
{
let mut punctuated = Punctuated::new();
loop {
let value = parser(input)?;
punctuated.push_value(value);
if !P::peek(input.cursor()) {
break;
}
let punct = input.parse()?;
punctuated.push_punct(punct);
}
Ok(punctuated)
}
}
#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl<T, P> Clone for Punctuated<T, P>
where
T: Clone,
P: Clone,
{
fn clone(&self) -> Self {
Punctuated {
inner: self.inner.clone(),
last: self.last.clone(),
}
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Eq for Punctuated<T, P>
where
T: Eq,
P: Eq,
{
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> PartialEq for Punctuated<T, P>
where
T: PartialEq,
P: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
let Punctuated { inner, last } = self;
*inner == other.inner && *last == other.last
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T, P> Hash for Punctuated<T, P>
where
T: Hash,
P: Hash,
{
fn hash<H: Hasher>(&self, state: &mut H) {
let Punctuated { inner, last } = self;
inner.hash(state);
last.hash(state);
}
}
#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl<T: Debug, P: Debug> Debug for Punctuated<T, P> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut list = f.debug_list();
for (t, p) in &self.inner {
list.entry(t);
list.entry(p);
}
if let Some(last) = &self.last {
list.entry(last);
}
list.finish()
}
}
impl<T, P> FromIterator<T> for Punctuated<T, P>
where
P: Default,
{
fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self {
let mut ret = Punctuated::new();
ret.extend(i);
ret
}
}
impl<T, P> Extend<T> for Punctuated<T, P>
where
P: Default,
{
fn extend<I: IntoIterator<Item = T>>(&mut self, i: I) {
for value in i {
self.push(value);
}
}More examples
src/expr.rs (line 2708)
2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724
fn expr_struct_helper(input: ParseStream, path: Path) -> Result<ExprStruct> {
let content;
let brace_token = braced!(content in input);
let mut fields = Punctuated::new();
while !content.is_empty() {
if content.peek(Token![..]) {
return Ok(ExprStruct {
attrs: Vec::new(),
brace_token,
path,
fields,
dot2_token: Some(content.parse()?),
rest: if content.is_empty() {
None
} else {
Some(Box::new(content.parse()?))
},
});
}
fields.push(content.parse()?);
if content.is_empty() {
break;
}
let punct: Token![,] = content.parse()?;
fields.push_punct(punct);
}
Ok(ExprStruct {
attrs: Vec::new(),
brace_token,
path,
fields,
dot2_token: None,
rest: None,
})
}sourcepub fn insert(&mut self, index: usize, value: T)where
P: Default,
pub fn insert(&mut self, index: usize, value: T)where
P: Default,
Inserts an element at position index.
Panics
Panics if index is greater than the number of elements previously in
this punctuated sequence.
Examples found in repository?
src/generics.rs (lines 884-890)
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
fn parse(input: ParseStream) -> Result<Self> {
#[cfg(feature = "full")]
let tilde_const = if input.peek(Token![~]) && input.peek2(Token![const]) {
let tilde_token = input.parse::<Token![~]>()?;
let const_token = input.parse::<Token![const]>()?;
Some((tilde_token, const_token))
} else {
None
};
let modifier: TraitBoundModifier = input.parse()?;
let lifetimes: Option<BoundLifetimes> = input.parse()?;
let mut path: Path = input.parse()?;
if path.segments.last().unwrap().arguments.is_empty()
&& (input.peek(token::Paren) || input.peek(Token![::]) && input.peek3(token::Paren))
{
input.parse::<Option<Token![::]>>()?;
let args: ParenthesizedGenericArguments = input.parse()?;
let parenthesized = PathArguments::Parenthesized(args);
path.segments.last_mut().unwrap().arguments = parenthesized;
}
#[cfg(feature = "full")]
{
if let Some((tilde_token, const_token)) = tilde_const {
path.segments.insert(
0,
PathSegment {
ident: Ident::new("const", const_token.span),
arguments: PathArguments::None,
},
);
let (_const, punct) = path.segments.pairs_mut().next().unwrap().into_tuple();
*punct.unwrap() = Token;
}
}
Ok(TraitBound {
paren_token: None,
modifier,
lifetimes,
path,
})
}sourcepub fn clear(&mut self)
pub fn clear(&mut self)
Clears the sequence of all values and punctuation, making it empty.
Examples found in repository?
src/generics.rs (line 796)
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let ident: Ident = input.parse()?;
let colon_token: Option<Token![:]> = input.parse()?;
let begin_bound = input.fork();
let mut is_maybe_const = false;
let mut bounds = Punctuated::new();
if colon_token.is_some() {
loop {
if input.peek(Token![,]) || input.peek(Token![>]) || input.peek(Token![=]) {
break;
}
if input.peek(Token![~]) && input.peek2(Token![const]) {
input.parse::<Token![~]>()?;
input.parse::<Token![const]>()?;
is_maybe_const = true;
}
let value: TypeParamBound = input.parse()?;
bounds.push_value(value);
if !input.peek(Token![+]) {
break;
}
let punct: Token![+] = input.parse()?;
bounds.push_punct(punct);
}
}
let mut eq_token: Option<Token![=]> = input.parse()?;
let mut default = if eq_token.is_some() {
Some(input.parse::<Type>()?)
} else {
None
};
if is_maybe_const {
bounds.clear();
eq_token = None;
default = Some(Type::Verbatim(verbatim::between(begin_bound, input)));
}
Ok(TypeParam {
attrs,
ident,
colon_token,
bounds,
eq_token,
default,
})
}sourcepub fn parse_terminated(input: ParseStream<'_>) -> Result<Self>where
T: Parse,
P: Parse,
Available on crate feature parsing only.
pub fn parse_terminated(input: ParseStream<'_>) -> Result<Self>where
T: Parse,
P: Parse,
parsing only.Parses zero or more occurrences of T separated by punctuation of type
P, with optional trailing punctuation.
Parsing continues until the end of this parse stream. The entire content
of this parse stream must consist of T and P.
This function is available only if Syn is built with the "parsing"
feature.
sourcepub fn parse_terminated_with(
input: ParseStream<'_>,
parser: fn(_: ParseStream<'_>) -> Result<T>
) -> Result<Self>where
P: Parse,
Available on crate feature parsing only.
pub fn parse_terminated_with(
input: ParseStream<'_>,
parser: fn(_: ParseStream<'_>) -> Result<T>
) -> Result<Self>where
P: Parse,
parsing only.Parses zero or more occurrences of T using the given parse function,
separated by punctuation of type P, with optional trailing
punctuation.
Like parse_terminated, the entire content of this stream is expected
to be parsed.
This function is available only if Syn is built with the "parsing"
feature.
Examples found in repository?
More examples
sourcepub fn parse_separated_nonempty(input: ParseStream<'_>) -> Result<Self>where
T: Parse,
P: Token + Parse,
Available on crate feature parsing only.
pub fn parse_separated_nonempty(input: ParseStream<'_>) -> Result<Self>where
T: Parse,
P: Token + Parse,
parsing only.Parses one or more occurrences of T separated by punctuation of type
P, not accepting trailing punctuation.
Parsing continues as long as punctuation P is present at the head of
the stream. This method returns upon parsing a T and observing that it
is not followed by a P, even if there are remaining tokens in the
stream.
This function is available only if Syn is built with the "parsing"
feature.
sourcepub fn parse_separated_nonempty_with(
input: ParseStream<'_>,
parser: fn(_: ParseStream<'_>) -> Result<T>
) -> Result<Self>where
P: Token + Parse,
Available on crate feature parsing only.
pub fn parse_separated_nonempty_with(
input: ParseStream<'_>,
parser: fn(_: ParseStream<'_>) -> Result<T>
) -> Result<Self>where
P: Token + Parse,
parsing only.Parses one or more occurrences of T using the given parse function,
separated by punctuation of type P, not accepting trailing
punctuation.
Like parse_separated_nonempty, may complete early without parsing
the entire content of this stream.
This function is available only if Syn is built with the "parsing"
feature.
Trait Implementations§
source§impl<T, P> Clone for Punctuated<T, P>where
T: Clone,
P: Clone,
Available on crate feature clone-impls only.
impl<T, P> Clone for Punctuated<T, P>where
T: Clone,
P: Clone,
Available on crate feature
clone-impls only.source§impl<T: Debug, P: Debug> Debug for Punctuated<T, P>
Available on crate feature extra-traits only.
impl<T: Debug, P: Debug> Debug for Punctuated<T, P>
Available on crate feature
extra-traits only.source§impl<T, P> Default for Punctuated<T, P>
impl<T, P> Default for Punctuated<T, P>
source§impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P>
impl<T, P> Extend<Pair<T, P>> for Punctuated<T, P>
source§fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I)
fn extend<I: IntoIterator<Item = Pair<T, P>>>(&mut self, i: I)
Extends a collection with the contents of an iterator. Read more
source§fn extend_one(&mut self, item: A)
fn extend_one(&mut self, item: A)
🔬This is a nightly-only experimental API. (
extend_one)Extends a collection with exactly one element.
source§fn extend_reserve(&mut self, additional: usize)
fn extend_reserve(&mut self, additional: usize)
🔬This is a nightly-only experimental API. (
extend_one)Reserves capacity in a collection for the given number of additional elements. Read more
source§impl<T, P> Extend<T> for Punctuated<T, P>where
P: Default,
impl<T, P> Extend<T> for Punctuated<T, P>where
P: Default,
source§fn extend<I: IntoIterator<Item = T>>(&mut self, i: I)
fn extend<I: IntoIterator<Item = T>>(&mut self, i: I)
Extends a collection with the contents of an iterator. Read more
source§fn extend_one(&mut self, item: A)
fn extend_one(&mut self, item: A)
🔬This is a nightly-only experimental API. (
extend_one)Extends a collection with exactly one element.
source§fn extend_reserve(&mut self, additional: usize)
fn extend_reserve(&mut self, additional: usize)
🔬This is a nightly-only experimental API. (
extend_one)Reserves capacity in a collection for the given number of additional elements. Read more
source§impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P>
impl<T, P> FromIterator<Pair<T, P>> for Punctuated<T, P>
source§impl<T, P> FromIterator<T> for Punctuated<T, P>where
P: Default,
impl<T, P> FromIterator<T> for Punctuated<T, P>where
P: Default,
source§fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self
fn from_iter<I: IntoIterator<Item = T>>(i: I) -> Self
Creates a value from an iterator. Read more
source§impl<T, P> Hash for Punctuated<T, P>where
T: Hash,
P: Hash,
Available on crate feature extra-traits only.
impl<T, P> Hash for Punctuated<T, P>where
T: Hash,
P: Hash,
Available on crate feature
extra-traits only.source§impl<T, P> Index<usize> for Punctuated<T, P>
impl<T, P> Index<usize> for Punctuated<T, P>
source§impl<T, P> IndexMut<usize> for Punctuated<T, P>
impl<T, P> IndexMut<usize> for Punctuated<T, P>
source§impl<'a, T, P> IntoIterator for &'a Punctuated<T, P>
impl<'a, T, P> IntoIterator for &'a Punctuated<T, P>
source§impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P>
impl<'a, T, P> IntoIterator for &'a mut Punctuated<T, P>
source§impl<T, P> IntoIterator for Punctuated<T, P>
impl<T, P> IntoIterator for Punctuated<T, P>
source§impl<T, P> PartialEq<Punctuated<T, P>> for Punctuated<T, P>where
T: PartialEq,
P: PartialEq,
Available on crate feature extra-traits only.
impl<T, P> PartialEq<Punctuated<T, P>> for Punctuated<T, P>where
T: PartialEq,
P: PartialEq,
Available on crate feature
extra-traits only.source§impl<T, P> ToTokens for Punctuated<T, P>where
T: ToTokens,
P: ToTokens,
Available on crate feature printing only.
impl<T, P> ToTokens for Punctuated<T, P>where
T: ToTokens,
P: ToTokens,
Available on crate feature
printing only.source§fn to_tokens(&self, tokens: &mut TokenStream)
fn to_tokens(&self, tokens: &mut TokenStream)
source§fn to_token_stream(&self) -> TokenStream
fn to_token_stream(&self) -> TokenStream
source§fn into_token_stream(self) -> TokenStreamwhere
Self: Sized,
fn into_token_stream(self) -> TokenStreamwhere
Self: Sized,
impl<T, P> Eq for Punctuated<T, P>where
T: Eq,
P: Eq,
Available on crate feature
extra-traits only.