Enum ArgValue 

pub enum ArgValue {
    Literal(Lit),
    Type(Type),
    Expr(Expr),
    None,
}

Value for attribute or attribute argument, i.e. for #[attr = value] and #[attr(arg = value)] this is the value part of the attribute. Can be either a single literal or a single valid rust type name

Variants

Literal(Lit)

Attribute value represented by a literal

Type(Type)

Attribute value represented by a type name

Expr(Expr)

Attribute value represented by an expression

None

No value is given

Implementations

impl ArgValue

pub fn into_literal_value(self) -> Result<Lit, Error>

Converts into literal value for ArgValue::Literal variant or fails with Error::ArgValueMustBeLiteral otherwise

pub fn into_type_value(self) -> Result<Type, Error>

Converts into type value for ArgValue::Type variant or fails with Error::ArgValueMustBeType otherwise

pub fn into_type_expr(self) -> Result<Expr, Error>

Converts into type value for ArgValue::Expr variant or fails with Error::ArgValueMustBeExpr otherwise

pub fn to_literal_value(&self) -> Result<Lit, Error>

Constructs literal value for ArgValue::Literal variant or fails with Error::ArgValueMustBeLiteral otherwise

pub fn to_type_value(&self) -> Result<Type, Error>

Constructs type value for ArgValue::Type variant or fails with Error::ArgValueMustBeType otherwise

pub fn to_type_expr(&self) -> Result<Expr, Error>

Constructs type value for ArgValue::Expr variant or fails with Error::ArgValueMustBeExpr otherwise

pub fn as_literal_value(&self) -> Option<&Lit>

Returns a reference to a literal value for ArgValue::Literal variant, or None otherwise.

pub fn as_type_value(&self) -> Option<&Type>

Returns a reference to a literal value for ArgValue::Type variant, or None otherwise.

pub fn as_type_expr(&self) -> Option<&Expr>

Returns a reference to a literal value for ArgValue::Expr variant, or None otherwise.

pub fn is_none(&self) -> bool

Tests whether the self is set to ArgValue::None

pub fn is_some(&self) -> bool

Tests whether the self is not set to ArgValue::None

pub fn value_class(&self) -> Option<ValueClass>

Returns ValueClass for the current value, if any

Trait Implementations

impl Clone for ArgValue

fn clone(&self) -> ArgValue

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ArgValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<&[u8]> for ArgValue

fn from(val: &[u8]) -> Self

Converts to this type from the input type.

impl From<&str> for ArgValue

fn from(val: &str) -> Self

Converts to this type from the input type.

impl From<Ident> for ArgValue

fn from(ident: Ident) -> Self

Converts to this type from the input type.

impl From<Option<LitBool>> for ArgValue

fn from(val: Option<LitBool>) -> Self

Converts to this type from the input type.

impl From<Option<LitByteStr>> for ArgValue

fn from(val: Option<LitByteStr>) -> Self

Converts to this type from the input type.

impl From<Option<LitChar>> for ArgValue

fn from(val: Option<LitChar>) -> Self

Converts to this type from the input type.

impl From<Option<LitFloat>> for ArgValue

fn from(val: Option<LitFloat>) -> Self

Converts to this type from the input type.

impl From<Option<LitInt>> for ArgValue

fn from(val: Option<LitInt>) -> Self

Converts to this type from the input type.

impl From<Option<LitStr>> for ArgValue

fn from(val: Option<LitStr>) -> Self

Converts to this type from the input type.

impl From<Path> for ArgValue

fn from(path: Path) -> Self

Converts to this type from the input type.

impl From<String> for ArgValue

fn from(val: String) -> Self

Converts to this type from the input type.

impl From<Vec<u8>> for ArgValue

fn from(val: Vec<u8>) -> Self

Converts to this type from the input type.

impl From<bool> for ArgValue

fn from(val: bool) -> Self

Converts to this type from the input type.

impl From<char> for ArgValue

fn from(val: char) -> Self

Converts to this type from the input type.

impl From<f64> for ArgValue

fn from(val: f64) -> Self

Converts to this type from the input type.

impl From<isize> for ArgValue

fn from(val: isize) -> Self

Converts to this type from the input type.

impl From<usize> for ArgValue

fn from(val: usize) -> Self

Converts to this type from the input type.

impl Parse for ArgValue

fn parse(input: &ParseBuffer<'_>) -> Result<Self>

impl ToTokens for ArgValue

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.

impl TryFrom<ArgValue> for Expr

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Ident

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitBool

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitByteStr

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitChar

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitFloat

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitInt

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for LitStr

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<Expr>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<Ident>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitBool>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitByteStr>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitChar>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitFloat>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitInt>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<LitStr>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Option<Path>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Path

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for String

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for Vec<u8>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for bool

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ArgValue> for char

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ArgValue) -> Result<Self, Self::Error>

Performs the conversion.