pub use self::AnnNode::*;
use crate::abi::{self, Abi};
use crate::ast::Attribute;
use crate::ast::{self, BlockCheckMode, PatKind, RangeEnd};
use crate::ast::{RegionTyParamBound, SelfKind, TraitBoundModifier, TraitTyParamBound};
use crate::attr;
use crate::codemap::{self, CodeMap};
use crate::parse::lexer::comments;
use crate::parse::token::{self, BinOpToken, Token};
use crate::parse::{self, ParseSess};
use crate::print::pp::Breaks::{Consistent, Inconsistent};
use crate::print::pp::{self, break_offset, hardbreak, space, word, zerobreak};
use crate::print::pp::{eof, Breaks};
use crate::ptr::P;
use crate::std_inject;
use crate::symbol::{keywords, Symbol};
use crate::syntax_pos::DUMMY_SP;
use crate::syntax_pos::{self, BytePos};
use crate::tokenstream::{self, TokenStream, TokenTree};
use crate::util::parser::AssocOp;
use std::ascii;
use std::io::{self, Read, Write};
use std::iter;
pub enum AnnNode<'a> {
NodeIdent(&'a ast::Ident),
NodeName(&'a ast::Name),
NodeBlock(&'a ast::Block),
NodeItem(&'a ast::Item),
NodeSubItem(ast::NodeId),
NodeExpr(&'a ast::Expr),
NodePat(&'a ast::Pat),
}
pub trait PpAnn {
fn pre(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> {
Ok(())
}
fn post(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> {
Ok(())
}
}
#[derive(Copy, Clone)]
pub struct NoAnn;
impl PpAnn for NoAnn {}
#[derive(Copy, Clone)]
pub struct CurrentCommentAndLiteral {
pub cur_cmnt: usize,
pub cur_lit: usize,
}
pub struct State<'a> {
pub s: pp::Printer<'a>,
cm: Option<&'a CodeMap>,
comments: Option<Vec<comments::Comment>>,
literals: Option<Vec<comments::Literal>>,
cur_cmnt_and_lit: CurrentCommentAndLiteral,
boxes: Vec<pp::Breaks>,
ann: &'a (dyn PpAnn + 'a),
}
pub fn rust_printer<'a>(writer: Box<dyn Write + 'a>) -> State<'a> {
static NO_ANN: NoAnn = NoAnn;
rust_printer_annotated(writer, &NO_ANN)
}
pub fn rust_printer_annotated<'a>(writer: Box<dyn Write + 'a>, ann: &'a dyn PpAnn) -> State<'a> {
State {
s: pp::mk_printer(writer, DEFAULT_COLUMNS),
cm: None,
comments: None,
literals: None,
cur_cmnt_and_lit: CurrentCommentAndLiteral {
cur_cmnt: 0,
cur_lit: 0,
},
boxes: Vec::new(),
ann: ann,
}
}
pub const INDENT_UNIT: usize = 4;
pub const DEFAULT_COLUMNS: usize = 78;
pub fn print_crate<'a>(
cm: &'a CodeMap,
sess: &ParseSess,
krate: &ast::Crate,
filename: String,
input: &mut dyn Read,
out: Box<dyn Write + 'a>,
ann: &'a dyn PpAnn,
is_expanded: bool,
) -> io::Result<()> {
let mut s = State::new_from_input(cm, sess, filename, input, out, ann, is_expanded);
if is_expanded && !std_inject::injected_crate_name(krate).is_none() {
let prelude_import_meta = attr::mk_list_word_item(Symbol::intern("prelude_import"));
let list = attr::mk_list_item(Symbol::intern("feature"), vec![prelude_import_meta]);
let fake_attr = attr::mk_attr_inner(DUMMY_SP, attr::mk_attr_id(), list);
s.print_attribute(&fake_attr)?;
let no_std_meta = attr::mk_word_item(Symbol::intern("no_std"));
let fake_attr = attr::mk_attr_inner(DUMMY_SP, attr::mk_attr_id(), no_std_meta);
s.print_attribute(&fake_attr)?;
}
s.print_mod(&krate.module, &krate.attrs)?;
s.print_remaining_comments()?;
eof(&mut s.s)
}
impl<'a> State<'a> {
pub fn new_from_input(
cm: &'a CodeMap,
sess: &ParseSess,
filename: String,
input: &mut dyn Read,
out: Box<dyn Write + 'a>,
ann: &'a dyn PpAnn,
is_expanded: bool,
) -> State<'a> {
let (cmnts, lits) = comments::gather_comments_and_literals(sess, filename, input);
State::new(
cm,
out,
ann,
Some(cmnts),
if is_expanded { None } else { Some(lits) },
)
}
pub fn new(
cm: &'a CodeMap,
out: Box<dyn Write + 'a>,
ann: &'a dyn PpAnn,
comments: Option<Vec<comments::Comment>>,
literals: Option<Vec<comments::Literal>>,
) -> State<'a> {
State {
s: pp::mk_printer(out, DEFAULT_COLUMNS),
cm: Some(cm),
comments: comments,
literals: literals,
cur_cmnt_and_lit: CurrentCommentAndLiteral {
cur_cmnt: 0,
cur_lit: 0,
},
boxes: Vec::new(),
ann: ann,
}
}
}
pub fn to_string<F>(f: F) -> String
where
F: FnOnce(&mut State) -> io::Result<()>,
{
let mut wr = Vec::new();
{
let mut printer = rust_printer(Box::new(&mut wr));
f(&mut printer).unwrap();
eof(&mut printer.s).unwrap();
}
String::from_utf8(wr).unwrap()
}
pub fn binop_to_string(op: BinOpToken) -> &'static str {
match op {
token::Plus => "+",
token::Minus => "-",
token::Star => "*",
token::Slash => "/",
token::Percent => "%",
token::Caret => "^",
token::And => "&",
token::Or => "|",
token::Shl => "<<",
token::Shr => ">>",
}
}
pub fn token_to_string(tok: &Token) -> String {
match *tok {
token::Eq => "=".to_string(),
token::Lt => "<".to_string(),
token::Le => "<=".to_string(),
token::EqEq => "==".to_string(),
token::Ne => "!=".to_string(),
token::Ge => ">=".to_string(),
token::Gt => ">".to_string(),
token::Not => "!".to_string(),
token::Tilde => "~".to_string(),
token::OrOr => "||".to_string(),
token::AndAnd => "&&".to_string(),
token::BinOp(op) => binop_to_string(op).to_string(),
token::BinOpEq(op) => format!("{}=", binop_to_string(op)),
token::At => "@".to_string(),
token::Dot => ".".to_string(),
token::DotDot => "..".to_string(),
token::DotDotDot => "...".to_string(),
token::Comma => ",".to_string(),
token::Semi => ";".to_string(),
token::Colon => ":".to_string(),
token::ModSep => "::".to_string(),
token::RArrow => "->".to_string(),
token::LArrow => "<-".to_string(),
token::FatArrow => "=>".to_string(),
token::OpenDelim(token::Paren) => "(".to_string(),
token::CloseDelim(token::Paren) => ")".to_string(),
token::OpenDelim(token::Bracket) => "[".to_string(),
token::CloseDelim(token::Bracket) => "]".to_string(),
token::OpenDelim(token::Brace) => "{".to_string(),
token::CloseDelim(token::Brace) => "}".to_string(),
token::OpenDelim(token::NoDelim) | token::CloseDelim(token::NoDelim) => " ".to_string(),
token::Pound => "#".to_string(),
token::Dollar => "$".to_string(),
token::Question => "?".to_string(),
token::Literal(lit, suf) => {
let mut out = match lit {
token::Byte(b) => format!("b'{}'", b),
token::Char(c) => format!("'{}'", c),
token::Float(c) | token::Integer(c) => c.to_string(),
token::Str_(s) => format!("\"{}\"", s),
token::StrRaw(s, n) => format!(
"r{delim}\"{string}\"{delim}",
delim = repeat("#", n),
string = s
),
token::ByteStr(v) => format!("b\"{}\"", v),
token::ByteStrRaw(s, n) => format!(
"br{delim}\"{string}\"{delim}",
delim = repeat("#", n),
string = s
),
};
if let Some(s) = suf {
out.push_str(&s.as_str())
}
out
}
token::Ident(s) => s.to_string(),
token::Lifetime(s) => s.to_string(),
token::Underscore => "_".to_string(),
token::DocComment(s) => s.to_string(),
token::SubstNt(s) => format!("${}", s),
token::Eof => "<eof>".to_string(),
token::Whitespace => " ".to_string(),
token::Comment => "/* */".to_string(),
token::Shebang(s) => format!("/* shebang: {}*/", s),
token::Interpolated(ref nt) => match **nt {
token::NtExpr(ref e) => expr_to_string(e),
token::NtMeta(ref e) => meta_item_to_string(e),
token::NtTy(ref e) => ty_to_string(e),
token::NtPath(ref e) => path_to_string(e),
token::NtItem(ref e) => item_to_string(e),
token::NtBlock(ref e) => block_to_string(e),
token::NtStmt(ref e) => stmt_to_string(e),
token::NtPat(ref e) => pat_to_string(e),
token::NtIdent(ref e) => ident_to_string(e.node),
token::NtTT(ref tree) => tt_to_string(tree.clone()),
token::NtArm(ref e) => arm_to_string(e),
token::NtImplItem(ref e) => impl_item_to_string(e),
token::NtTraitItem(ref e) => trait_item_to_string(e),
token::NtGenerics(ref e) => generics_to_string(e),
token::NtWhereClause(ref e) => where_clause_to_string(e),
token::NtArg(ref e) => arg_to_string(e),
token::NtVis(ref e) => vis_to_string(e),
},
}
}
pub fn ty_to_string(ty: &ast::Ty) -> String {
to_string(|s| s.print_type(ty))
}
pub fn bounds_to_string(bounds: &[ast::TyParamBound]) -> String {
to_string(|s| s.print_bounds("", bounds))
}
pub fn pat_to_string(pat: &ast::Pat) -> String {
to_string(|s| s.print_pat(pat))
}
pub fn arm_to_string(arm: &ast::Arm) -> String {
to_string(|s| s.print_arm(arm))
}
pub fn expr_to_string(e: &ast::Expr) -> String {
to_string(|s| s.print_expr(e))
}
pub fn lifetime_to_string(e: &ast::Lifetime) -> String {
to_string(|s| s.print_lifetime(e))
}
pub fn tt_to_string(tt: tokenstream::TokenTree) -> String {
to_string(|s| s.print_tt(tt))
}
pub fn tts_to_string(tts: &[tokenstream::TokenTree]) -> String {
to_string(|s| s.print_tts(tts.iter().cloned().collect()))
}
pub fn tokens_to_string(tokens: TokenStream) -> String {
to_string(|s| s.print_tts(tokens))
}
pub fn stmt_to_string(stmt: &ast::Stmt) -> String {
to_string(|s| s.print_stmt(stmt))
}
pub fn attr_to_string(attr: &ast::Attribute) -> String {
to_string(|s| s.print_attribute(attr))
}
pub fn item_to_string(i: &ast::Item) -> String {
to_string(|s| s.print_item(i))
}
pub fn impl_item_to_string(i: &ast::ImplItem) -> String {
to_string(|s| s.print_impl_item(i))
}
pub fn trait_item_to_string(i: &ast::TraitItem) -> String {
to_string(|s| s.print_trait_item(i))
}
pub fn generics_to_string(generics: &ast::Generics) -> String {
to_string(|s| s.print_generics(generics))
}
pub fn where_clause_to_string(i: &ast::WhereClause) -> String {
to_string(|s| s.print_where_clause(i))
}
pub fn fn_block_to_string(p: &ast::FnDecl) -> String {
to_string(|s| s.print_fn_block_args(p))
}
pub fn path_to_string(p: &ast::Path) -> String {
to_string(|s| s.print_path(p, false, 0, false))
}
pub fn ident_to_string(id: ast::Ident) -> String {
to_string(|s| s.print_ident(id))
}
pub fn vis_to_string(v: &ast::Visibility) -> String {
to_string(|s| s.print_visibility(v))
}
pub fn fun_to_string(
decl: &ast::FnDecl,
unsafety: ast::Unsafety,
constness: ast::Constness,
name: ast::Ident,
generics: &ast::Generics,
) -> String {
to_string(|s| {
s.head("")?;
s.print_fn(
decl,
unsafety,
constness,
Abi::Rust,
Some(name),
generics,
&ast::Visibility::Inherited,
)?;
s.end()?;
s.end()
})
}
pub fn block_to_string(blk: &ast::Block) -> String {
to_string(|s| {
s.cbox(INDENT_UNIT)?;
s.ibox(0)?;
s.print_block(blk)
})
}
pub fn meta_list_item_to_string(li: &ast::NestedMetaItem) -> String {
to_string(|s| s.print_meta_list_item(li))
}
pub fn meta_item_to_string(mi: &ast::MetaItem) -> String {
to_string(|s| s.print_meta_item(mi))
}
pub fn attribute_to_string(attr: &ast::Attribute) -> String {
to_string(|s| s.print_attribute(attr))
}
pub fn lit_to_string(l: &ast::Lit) -> String {
to_string(|s| s.print_literal(l))
}
pub fn variant_to_string(var: &ast::Variant) -> String {
to_string(|s| s.print_variant(var))
}
pub fn arg_to_string(arg: &ast::Arg) -> String {
to_string(|s| s.print_arg(arg, false))
}
pub fn mac_to_string(arg: &ast::Mac) -> String {
to_string(|s| s.print_mac(arg, crate::parse::token::Paren))
}
pub fn visibility_qualified(vis: &ast::Visibility, s: &str) -> String {
format!("{}{}", to_string(|s| s.print_visibility(vis)), s)
}
fn needs_parentheses(expr: &ast::Expr) -> bool {
match expr.node {
ast::ExprKind::Assign(..)
| ast::ExprKind::Binary(..)
| ast::ExprKind::Closure(..)
| ast::ExprKind::AssignOp(..)
| ast::ExprKind::Cast(..)
| ast::ExprKind::InPlace(..)
| ast::ExprKind::Type(..) => true,
_ => false,
}
}
pub trait PrintState<'a> {
fn writer(&mut self) -> &mut pp::Printer<'a>;
fn boxes(&mut self) -> &mut Vec<pp::Breaks>;
fn comments(&mut self) -> &mut Option<Vec<comments::Comment>>;
fn cur_cmnt_and_lit(&mut self) -> &mut CurrentCommentAndLiteral;
fn literals(&self) -> &Option<Vec<comments::Literal>>;
fn word_space(&mut self, w: &str) -> io::Result<()> {
word(self.writer(), w)?;
space(self.writer())
}
fn popen(&mut self) -> io::Result<()> {
word(self.writer(), "(")
}
fn pclose(&mut self) -> io::Result<()> {
word(self.writer(), ")")
}
fn is_begin(&mut self) -> bool {
match self.writer().last_token() {
pp::Token::Begin(_) => true,
_ => false,
}
}
fn is_end(&mut self) -> bool {
match self.writer().last_token() {
pp::Token::End => true,
_ => false,
}
}
fn is_bol(&mut self) -> bool {
self.writer().last_token().is_eof() || self.writer().last_token().is_hardbreak_tok()
}
fn hardbreak_if_not_bol(&mut self) -> io::Result<()> {
if !self.is_bol() {
hardbreak(self.writer())?
}
Ok(())
}
fn rbox(&mut self, u: usize, b: pp::Breaks) -> io::Result<()> {
self.boxes().push(b);
pp::rbox(self.writer(), u, b)
}
fn ibox(&mut self, u: usize) -> io::Result<()> {
self.boxes().push(pp::Breaks::Inconsistent);
pp::ibox(self.writer(), u)
}
fn end(&mut self) -> io::Result<()> {
self.boxes().pop().unwrap();
pp::end(self.writer())
}
fn commasep<T, F>(&mut self, b: Breaks, elts: &[T], mut op: F) -> io::Result<()>
where
F: FnMut(&mut Self, &T) -> io::Result<()>,
{
self.rbox(0, b)?;
let mut first = true;
for elt in elts {
if first {
first = false;
} else {
self.word_space(",")?;
}
op(self, elt)?;
}
self.end()
}
fn next_lit(&mut self, pos: BytePos) -> Option<comments::Literal> {
let mut cur_lit = self.cur_cmnt_and_lit().cur_lit;
let mut result = None;
if let Some(ref lits) = *self.literals() {
while cur_lit < lits.len() {
let ltrl = (*lits)[cur_lit].clone();
if ltrl.pos > pos {
break;
}
cur_lit += 1;
if ltrl.pos == pos {
result = Some(ltrl);
break;
}
}
}
self.cur_cmnt_and_lit().cur_lit = cur_lit;
result
}
fn maybe_print_comment(&mut self, pos: BytePos) -> io::Result<()> {
while let Some(ref cmnt) = self.next_comment() {
if cmnt.pos < pos {
self.print_comment(cmnt)?;
self.cur_cmnt_and_lit().cur_cmnt += 1;
} else {
break;
}
}
Ok(())
}
fn print_comment(&mut self, cmnt: &comments::Comment) -> io::Result<()> {
match cmnt.style {
comments::Mixed => {
assert_eq!(cmnt.lines.len(), 1);
zerobreak(self.writer())?;
word(self.writer(), &cmnt.lines[0])?;
zerobreak(self.writer())
}
comments::Isolated => {
self.hardbreak_if_not_bol()?;
for line in &cmnt.lines {
if !line.is_empty() {
word(self.writer(), &line[..])?;
}
hardbreak(self.writer())?;
}
Ok(())
}
comments::Trailing => {
if !self.is_bol() {
word(self.writer(), " ")?;
}
if cmnt.lines.len() == 1 {
word(self.writer(), &cmnt.lines[0])?;
hardbreak(self.writer())
} else {
self.ibox(0)?;
for line in &cmnt.lines {
if !line.is_empty() {
word(self.writer(), &line[..])?;
}
hardbreak(self.writer())?;
}
self.end()
}
}
comments::BlankLine => {
let is_semi = match self.writer().last_token() {
pp::Token::String(s, _) => ";" == s,
_ => false,
};
if is_semi || self.is_begin() || self.is_end() {
hardbreak(self.writer())?;
}
hardbreak(self.writer())
}
}
}
fn next_comment(&mut self) -> Option<comments::Comment> {
let cur_cmnt = self.cur_cmnt_and_lit().cur_cmnt;
match *self.comments() {
Some(ref cmnts) => {
if cur_cmnt < cmnts.len() {
Some(cmnts[cur_cmnt].clone())
} else {
None
}
}
_ => None,
}
}
fn print_literal(&mut self, lit: &ast::Lit) -> io::Result<()> {
self.maybe_print_comment(lit.span.lo)?;
if let Some(ref ltrl) = self.next_lit(lit.span.lo) {
return word(self.writer(), &(*ltrl).lit);
}
match lit.node {
ast::LitKind::Str(st, style) => self.print_string(&st.as_str(), style),
ast::LitKind::Byte(byte) => {
let mut res = String::from("b'");
res.extend(ascii::escape_default(byte).map(|c| c as char));
res.push('\'');
word(self.writer(), &res[..])
}
ast::LitKind::Char(ch) => {
let mut res = String::from("'");
res.extend(ch.escape_default());
res.push('\'');
word(self.writer(), &res[..])
}
ast::LitKind::Int(i, t) => match t {
ast::LitIntType::Signed(st) => word(self.writer(), &st.val_to_string(i as i128)),
ast::LitIntType::Unsigned(ut) => word(self.writer(), &ut.val_to_string(i)),
ast::LitIntType::Unsuffixed => word(self.writer(), &format!("{}", i)),
},
ast::LitKind::Float(ref f, t) => {
word(self.writer(), &format!("{}{}", &f, t.ty_to_string()))
}
ast::LitKind::FloatUnsuffixed(ref f) => word(self.writer(), &f.as_str()),
ast::LitKind::Bool(val) => {
if val {
word(self.writer(), "true")
} else {
word(self.writer(), "false")
}
}
ast::LitKind::ByteStr(ref v) => {
let mut escaped: String = String::new();
for &ch in v.iter() {
escaped.extend(ascii::escape_default(ch).map(|c| c as char));
}
word(self.writer(), &format!("b\"{}\"", escaped))
}
}
}
fn print_string(&mut self, st: &str, style: ast::StrStyle) -> io::Result<()> {
let st = match style {
ast::StrStyle::Cooked => format!("\"{}\"", parse::escape_default(st)),
ast::StrStyle::Raw(n) => format!(
"r{delim}\"{string}\"{delim}",
delim = repeat("#", n),
string = st
),
};
word(self.writer(), &st[..])
}
fn print_inner_attributes(&mut self, attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, true)
}
fn print_inner_attributes_no_trailing_hardbreak(
&mut self,
attrs: &[ast::Attribute],
) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, false)
}
fn print_outer_attributes(&mut self, attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Outer, false, true)
}
fn print_inner_attributes_inline(&mut self, attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Inner, true, true)
}
fn print_outer_attributes_inline(&mut self, attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Outer, true, true)
}
fn print_either_attributes(
&mut self,
attrs: &[ast::Attribute],
kind: ast::AttrStyle,
is_inline: bool,
trailing_hardbreak: bool,
) -> io::Result<()> {
let mut count = 0;
for attr in attrs {
if attr.style == kind {
self.print_attribute_inline(attr, is_inline)?;
if is_inline {
self.nbsp()?;
}
count += 1;
}
}
if count > 0 && trailing_hardbreak && !is_inline {
self.hardbreak_if_not_bol()?;
}
Ok(())
}
fn print_attribute(&mut self, attr: &ast::Attribute) -> io::Result<()> {
self.print_attribute_inline(attr, false)
}
fn print_attribute_inline(&mut self, attr: &ast::Attribute, is_inline: bool) -> io::Result<()> {
if !is_inline {
self.hardbreak_if_not_bol()?;
}
self.maybe_print_comment(attr.span.lo)?;
if attr.is_sugared_doc {
word(self.writer(), &attr.value_str().unwrap().as_str())?;
hardbreak(self.writer())
} else {
match attr.style {
ast::AttrStyle::Inner => word(self.writer(), "#![")?,
ast::AttrStyle::Outer => word(self.writer(), "#[")?,
}
if let Some(mi) = attr.meta() {
self.print_meta_item(&mi)?
} else {
for (i, segment) in attr.path.segments.iter().enumerate() {
if i > 0 {
word(self.writer(), "::")?
}
if segment.identifier.name != keywords::CrateRoot.name()
&& segment.identifier.name != "$crate"
{
word(self.writer(), &segment.identifier.name.as_str())?;
}
}
space(self.writer())?;
self.print_tts(attr.tokens.clone())?;
}
word(self.writer(), "]")
}
}
fn print_meta_list_item(&mut self, item: &ast::NestedMetaItem) -> io::Result<()> {
match item.node {
ast::NestedMetaItemKind::MetaItem(ref mi) => self.print_meta_item(mi),
ast::NestedMetaItemKind::Literal(ref lit) => self.print_literal(lit),
}
}
fn print_meta_item(&mut self, item: &ast::MetaItem) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
match item.node {
ast::MetaItemKind::Word => {
word(self.writer(), &item.name.as_str())?;
}
ast::MetaItemKind::NameValue(ref value) => {
self.word_space(&item.name.as_str())?;
self.word_space("=")?;
self.print_literal(value)?;
}
ast::MetaItemKind::List(ref items) => {
word(self.writer(), &item.name.as_str())?;
self.popen()?;
self.commasep(Consistent, &items[..], |s, i| s.print_meta_list_item(i))?;
self.pclose()?;
}
}
self.end()
}
fn print_tt(&mut self, tt: tokenstream::TokenTree) -> io::Result<()> {
match tt {
TokenTree::Token(_, ref tk) => {
word(self.writer(), &token_to_string(tk))?;
match *tk {
parse::token::DocComment(..) => hardbreak(self.writer()),
_ => Ok(()),
}
}
TokenTree::Delimited(_, ref delimed) => {
word(self.writer(), &token_to_string(&delimed.open_token()))?;
space(self.writer())?;
self.print_tts(delimed.stream())?;
space(self.writer())?;
word(self.writer(), &token_to_string(&delimed.close_token()))
}
}
}
fn print_tts(&mut self, tts: tokenstream::TokenStream) -> io::Result<()> {
self.ibox(0)?;
for (i, tt) in tts.into_trees().enumerate() {
if i != 0 {
space(self.writer())?;
}
self.print_tt(tt)?;
}
self.end()
}
fn space_if_not_bol(&mut self) -> io::Result<()> {
if !self.is_bol() {
space(self.writer())?;
}
Ok(())
}
fn nbsp(&mut self) -> io::Result<()> {
word(self.writer(), " ")
}
}
impl<'a> PrintState<'a> for State<'a> {
fn writer(&mut self) -> &mut pp::Printer<'a> {
&mut self.s
}
fn boxes(&mut self) -> &mut Vec<pp::Breaks> {
&mut self.boxes
}
fn comments(&mut self) -> &mut Option<Vec<comments::Comment>> {
&mut self.comments
}
fn cur_cmnt_and_lit(&mut self) -> &mut CurrentCommentAndLiteral {
&mut self.cur_cmnt_and_lit
}
fn literals(&self) -> &Option<Vec<comments::Literal>> {
&self.literals
}
}
impl<'a> State<'a> {
pub fn cbox(&mut self, u: usize) -> io::Result<()> {
self.boxes.push(pp::Breaks::Consistent);
pp::cbox(&mut self.s, u)
}
pub fn word_nbsp(&mut self, w: &str) -> io::Result<()> {
word(&mut self.s, w)?;
self.nbsp()
}
pub fn head(&mut self, w: &str) -> io::Result<()> {
self.cbox(INDENT_UNIT)?;
self.ibox(w.len() + 1)?;
if !w.is_empty() {
self.word_nbsp(w)?;
}
Ok(())
}
pub fn bopen(&mut self) -> io::Result<()> {
word(&mut self.s, "{")?;
self.end()
}
pub fn bclose_(&mut self, span: syntax_pos::Span, indented: usize) -> io::Result<()> {
self.bclose_maybe_open(span, indented, true)
}
pub fn bclose_maybe_open(
&mut self,
span: syntax_pos::Span,
indented: usize,
close_box: bool,
) -> io::Result<()> {
self.maybe_print_comment(span.hi)?;
self.break_offset_if_not_bol(1, -(indented as isize))?;
word(&mut self.s, "}")?;
if close_box {
self.end()?;
}
Ok(())
}
pub fn bclose(&mut self, span: syntax_pos::Span) -> io::Result<()> {
self.bclose_(span, INDENT_UNIT)
}
pub fn in_cbox(&self) -> bool {
match self.boxes.last() {
Some(&last_box) => last_box == pp::Breaks::Consistent,
None => false,
}
}
pub fn break_offset_if_not_bol(&mut self, n: usize, off: isize) -> io::Result<()> {
if !self.is_bol() {
break_offset(&mut self.s, n, off)
} else {
if off != 0 && self.s.last_token().is_hardbreak_tok() {
self.s.replace_last_token(pp::hardbreak_tok_offset(off));
}
Ok(())
}
}
pub fn synth_comment(&mut self, text: String) -> io::Result<()> {
word(&mut self.s, "/*")?;
space(&mut self.s)?;
word(&mut self.s, &text[..])?;
space(&mut self.s)?;
word(&mut self.s, "*/")
}
pub fn commasep_cmnt<T, F, G>(
&mut self,
b: Breaks,
elts: &[T],
mut op: F,
mut get_span: G,
) -> io::Result<()>
where
F: FnMut(&mut State, &T) -> io::Result<()>,
G: FnMut(&T) -> syntax_pos::Span,
{
self.rbox(0, b)?;
let len = elts.len();
let mut i = 0;
for elt in elts {
self.maybe_print_comment(get_span(elt).hi)?;
op(self, elt)?;
i += 1;
if i < len {
word(&mut self.s, ",")?;
self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi))?;
self.space_if_not_bol()?;
}
}
self.end()
}
pub fn commasep_exprs(&mut self, b: Breaks, exprs: &[P<ast::Expr>]) -> io::Result<()> {
self.commasep_cmnt(b, exprs, |s, e| s.print_expr(e), |e| e.span)
}
pub fn print_mod(&mut self, _mod: &ast::Mod, attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_inner_attributes(attrs)?;
for item in &_mod.items {
self.print_item(item)?;
}
Ok(())
}
pub fn print_foreign_mod(
&mut self,
nmod: &ast::ForeignMod,
attrs: &[ast::Attribute],
) -> io::Result<()> {
self.print_inner_attributes(attrs)?;
for item in &nmod.items {
self.print_foreign_item(item)?;
}
Ok(())
}
pub fn print_opt_lifetime(&mut self, lifetime: &Option<ast::Lifetime>) -> io::Result<()> {
if let Some(l) = *lifetime {
self.print_lifetime(&l)?;
self.nbsp()?;
}
Ok(())
}
pub fn print_type(&mut self, ty: &ast::Ty) -> io::Result<()> {
self.maybe_print_comment(ty.span.lo)?;
self.ibox(0)?;
match ty.node {
ast::TyKind::Slice(ref ty) => {
word(&mut self.s, "[")?;
self.print_type(ty)?;
word(&mut self.s, "]")?;
}
ast::TyKind::Ptr(ref mt) => {
word(&mut self.s, "*")?;
match mt.mutbl {
ast::Mutability::Mutable => self.word_nbsp("mut")?,
ast::Mutability::Immutable => self.word_nbsp("const")?,
}
self.print_type(&mt.ty)?;
}
ast::TyKind::Rptr(ref lifetime, ref mt) => {
word(&mut self.s, "&")?;
self.print_opt_lifetime(lifetime)?;
self.print_mt(mt)?;
}
ast::TyKind::Never => {
word(&mut self.s, "!")?;
}
ast::TyKind::Tup(ref elts) => {
self.popen()?;
self.commasep(Inconsistent, &elts[..], |s, ty| s.print_type(ty))?;
if elts.len() == 1 {
word(&mut self.s, ",")?;
}
self.pclose()?;
}
ast::TyKind::Paren(ref typ) => {
self.popen()?;
self.print_type(typ)?;
self.pclose()?;
}
ast::TyKind::BareFn(ref f) => {
let generics = ast::Generics {
lifetimes: f.lifetimes.clone(),
ty_params: Vec::new(),
where_clause: ast::WhereClause {
id: ast::DUMMY_NODE_ID,
predicates: Vec::new(),
},
span: syntax_pos::DUMMY_SP,
};
self.print_ty_fn(f.abi, f.unsafety, &f.decl, None, &generics)?;
}
ast::TyKind::Path(None, ref path) => {
self.print_path(path, false, 0, false)?;
}
ast::TyKind::Path(Some(ref qself), ref path) => self.print_qpath(path, qself, false)?,
ast::TyKind::TraitObject(ref bounds) => {
self.print_bounds("", &bounds[..])?;
}
ast::TyKind::ImplTrait(ref bounds) => {
self.print_bounds("impl ", &bounds[..])?;
}
ast::TyKind::Array(ref ty, ref v) => {
word(&mut self.s, "[")?;
self.print_type(ty)?;
word(&mut self.s, "; ")?;
self.print_expr(v)?;
word(&mut self.s, "]")?;
}
ast::TyKind::Typeof(ref e) => {
word(&mut self.s, "typeof(")?;
self.print_expr(e)?;
word(&mut self.s, ")")?;
}
ast::TyKind::Infer => {
word(&mut self.s, "_")?;
}
ast::TyKind::Err => {
word(&mut self.s, "?")?;
}
ast::TyKind::ImplicitSelf => {
word(&mut self.s, "Self")?;
}
ast::TyKind::Mac(ref m) => {
self.print_mac(m, token::Paren)?;
}
}
self.end()
}
pub fn print_foreign_item(&mut self, item: &ast::ForeignItem) -> io::Result<()> {
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(item.span.lo)?;
self.print_outer_attributes(&item.attrs)?;
match item.node {
ast::ForeignItemKind::Fn(ref decl, ref generics) => {
self.head("")?;
self.print_fn(
decl,
ast::Unsafety::Normal,
ast::Constness::NotConst,
Abi::Rust,
Some(item.ident),
generics,
&item.vis,
)?;
self.end()?;
word(&mut self.s, ";")?;
self.end()
}
ast::ForeignItemKind::Static(ref t, m) => {
self.head(&visibility_qualified(&item.vis, "static"))?;
if m {
self.word_space("mut")?;
}
self.print_ident(item.ident)?;
self.word_space(":")?;
self.print_type(t)?;
word(&mut self.s, ";")?;
self.end()?;
self.end()
}
}
}
fn print_associated_const(
&mut self,
ident: ast::Ident,
ty: &ast::Ty,
default: Option<&ast::Expr>,
vis: &ast::Visibility,
) -> io::Result<()> {
word(&mut self.s, &visibility_qualified(vis, ""))?;
self.word_space("const")?;
self.print_ident(ident)?;
self.word_space(":")?;
self.print_type(ty)?;
if let Some(expr) = default {
space(&mut self.s)?;
self.word_space("=")?;
self.print_expr(expr)?;
}
word(&mut self.s, ";")
}
fn print_associated_type(
&mut self,
ident: ast::Ident,
bounds: Option<&ast::TyParamBounds>,
ty: Option<&ast::Ty>,
) -> io::Result<()> {
self.word_space("type")?;
self.print_ident(ident)?;
if let Some(bounds) = bounds {
self.print_bounds(":", bounds)?;
}
if let Some(ty) = ty {
space(&mut self.s)?;
self.word_space("=")?;
self.print_type(ty)?;
}
word(&mut self.s, ";")
}
pub fn print_item(&mut self, item: &ast::Item) -> io::Result<()> {
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(item.span.lo)?;
self.print_outer_attributes(&item.attrs)?;
self.ann.pre(self, NodeItem(item))?;
match item.node {
ast::ItemKind::ExternCrate(ref optional_path) => {
self.head(&visibility_qualified(&item.vis, "extern crate"))?;
if let Some(p) = *optional_path {
let val = p.as_str();
if val.contains('-') {
self.print_string(&val, ast::StrStyle::Cooked)?;
} else {
self.print_name(p)?;
}
space(&mut self.s)?;
word(&mut self.s, "as")?;
space(&mut self.s)?;
}
self.print_ident(item.ident)?;
word(&mut self.s, ";")?;
self.end()?;
self.end()?;
}
ast::ItemKind::Use(ref vp) => {
self.head(&visibility_qualified(&item.vis, "use"))?;
self.print_view_path(vp)?;
word(&mut self.s, ";")?;
self.end()?;
self.end()?;
}
ast::ItemKind::Static(ref ty, m, ref expr) => {
self.head(&visibility_qualified(&item.vis, "static"))?;
if m == ast::Mutability::Mutable {
self.word_space("mut")?;
}
self.print_ident(item.ident)?;
self.word_space(":")?;
self.print_type(ty)?;
space(&mut self.s)?;
self.end()?;
self.word_space("=")?;
self.print_expr(expr)?;
word(&mut self.s, ";")?;
self.end()?;
}
ast::ItemKind::Const(ref ty, ref expr) => {
self.head(&visibility_qualified(&item.vis, "const"))?;
self.print_ident(item.ident)?;
self.word_space(":")?;
self.print_type(ty)?;
space(&mut self.s)?;
self.end()?;
self.word_space("=")?;
self.print_expr(expr)?;
word(&mut self.s, ";")?;
self.end()?;
}
ast::ItemKind::Fn(ref decl, unsafety, constness, abi, ref typarams, ref body) => {
self.head("")?;
self.print_fn(
decl,
unsafety,
constness.node,
abi,
Some(item.ident),
typarams,
&item.vis,
)?;
word(&mut self.s, " ")?;
self.print_block_with_attrs(body, &item.attrs)?;
}
ast::ItemKind::Mod(ref _mod) => {
self.head(&visibility_qualified(&item.vis, "mod"))?;
self.print_ident(item.ident)?;
self.nbsp()?;
self.bopen()?;
self.print_mod(_mod, &item.attrs)?;
self.bclose(item.span)?;
}
ast::ItemKind::ForeignMod(ref nmod) => {
self.head("extern")?;
self.word_nbsp(&nmod.abi.to_string())?;
self.bopen()?;
self.print_foreign_mod(nmod, &item.attrs)?;
self.bclose(item.span)?;
}
ast::ItemKind::GlobalAsm(ref ga) => {
self.head(&visibility_qualified(&item.vis, "global_asm!"))?;
word(&mut self.s, &ga.asm.as_str())?;
self.end()?;
}
ast::ItemKind::Ty(ref ty, ref params) => {
self.ibox(INDENT_UNIT)?;
self.ibox(0)?;
self.word_nbsp(&visibility_qualified(&item.vis, "type"))?;
self.print_ident(item.ident)?;
self.print_generics(params)?;
self.end()?;
self.print_where_clause(¶ms.where_clause)?;
space(&mut self.s)?;
self.word_space("=")?;
self.print_type(ty)?;
word(&mut self.s, ";")?;
self.end()?;
}
ast::ItemKind::Enum(ref enum_definition, ref params) => {
self.print_enum_def(enum_definition, params, item.ident, item.span, &item.vis)?;
}
ast::ItemKind::Struct(ref struct_def, ref generics) => {
self.head(&visibility_qualified(&item.vis, "struct"))?;
self.print_struct(struct_def, generics, item.ident, item.span, true)?;
}
ast::ItemKind::Union(ref struct_def, ref generics) => {
self.head(&visibility_qualified(&item.vis, "union"))?;
self.print_struct(struct_def, generics, item.ident, item.span, true)?;
}
ast::ItemKind::DefaultImpl(unsafety, ref trait_ref) => {
self.head("")?;
self.print_visibility(&item.vis)?;
self.print_unsafety(unsafety)?;
self.word_nbsp("impl")?;
self.print_trait_ref(trait_ref)?;
space(&mut self.s)?;
self.word_space("for")?;
self.word_space("..")?;
self.bopen()?;
self.bclose(item.span)?;
}
ast::ItemKind::Impl(
unsafety,
polarity,
defaultness,
ref generics,
ref opt_trait,
ref ty,
ref impl_items,
) => {
self.head("")?;
self.print_visibility(&item.vis)?;
self.print_defaultness(defaultness)?;
self.print_unsafety(unsafety)?;
self.word_nbsp("impl")?;
if generics.is_parameterized() {
self.print_generics(generics)?;
space(&mut self.s)?;
}
if polarity == ast::ImplPolarity::Negative {
word(&mut self.s, "!")?;
}
if let Some(ref t) = *opt_trait {
self.print_trait_ref(t)?;
space(&mut self.s)?;
self.word_space("for")?;
}
self.print_type(ty)?;
self.print_where_clause(&generics.where_clause)?;
space(&mut self.s)?;
self.bopen()?;
self.print_inner_attributes(&item.attrs)?;
for impl_item in impl_items {
self.print_impl_item(impl_item)?;
}
self.bclose(item.span)?;
}
ast::ItemKind::Trait(unsafety, ref generics, ref bounds, ref trait_items) => {
self.head("")?;
self.print_visibility(&item.vis)?;
self.print_unsafety(unsafety)?;
self.word_nbsp("trait")?;
self.print_ident(item.ident)?;
self.print_generics(generics)?;
let mut real_bounds = Vec::with_capacity(bounds.len());
for b in bounds.iter() {
if let TraitTyParamBound(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
space(&mut self.s)?;
self.word_space("for ?")?;
self.print_trait_ref(&ptr.trait_ref)?;
} else {
real_bounds.push(b.clone());
}
}
self.print_bounds(":", &real_bounds[..])?;
self.print_where_clause(&generics.where_clause)?;
word(&mut self.s, " ")?;
self.bopen()?;
for trait_item in trait_items {
self.print_trait_item(trait_item)?;
}
self.bclose(item.span)?;
}
ast::ItemKind::Mac(codemap::Spanned { ref node, .. }) => {
self.print_path(&node.path, false, 0, false)?;
word(&mut self.s, "! ")?;
self.print_ident(item.ident)?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
self.print_tts(node.stream())?;
self.pclose()?;
word(&mut self.s, ";")?;
self.end()?;
}
ast::ItemKind::MacroDef(ref tts) => {
word(&mut self.s, "macro_rules! ")?;
self.print_ident(item.ident)?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
self.print_tts(tts.stream())?;
self.pclose()?;
word(&mut self.s, ";")?;
self.end()?;
}
}
self.ann.post(self, NodeItem(item))
}
fn print_trait_ref(&mut self, t: &ast::TraitRef) -> io::Result<()> {
self.print_path(&t.path, false, 0, false)
}
fn print_formal_lifetime_list(&mut self, lifetimes: &[ast::LifetimeDef]) -> io::Result<()> {
if !lifetimes.is_empty() {
word(&mut self.s, "for<")?;
let mut comma = false;
for lifetime_def in lifetimes {
if comma {
self.word_space(",")?
}
self.print_outer_attributes_inline(&lifetime_def.attrs)?;
self.print_lifetime_bounds(&lifetime_def.lifetime, &lifetime_def.bounds)?;
comma = true;
}
word(&mut self.s, ">")?;
}
Ok(())
}
fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) -> io::Result<()> {
self.print_formal_lifetime_list(&t.bound_lifetimes)?;
self.print_trait_ref(&t.trait_ref)
}
pub fn print_enum_def(
&mut self,
enum_definition: &ast::EnumDef,
generics: &ast::Generics,
ident: ast::Ident,
span: syntax_pos::Span,
visibility: &ast::Visibility,
) -> io::Result<()> {
self.head(&visibility_qualified(visibility, "enum"))?;
self.print_ident(ident)?;
self.print_generics(generics)?;
self.print_where_clause(&generics.where_clause)?;
space(&mut self.s)?;
self.print_variants(&enum_definition.variants, span)
}
pub fn print_variants(
&mut self,
variants: &[ast::Variant],
span: syntax_pos::Span,
) -> io::Result<()> {
self.bopen()?;
for v in variants {
self.space_if_not_bol()?;
self.maybe_print_comment(v.span.lo)?;
self.print_outer_attributes(&v.node.attrs)?;
self.ibox(INDENT_UNIT)?;
self.print_variant(v)?;
word(&mut self.s, ",")?;
self.end()?;
self.maybe_print_trailing_comment(v.span, None)?;
}
self.bclose(span)
}
pub fn print_visibility(&mut self, vis: &ast::Visibility) -> io::Result<()> {
match *vis {
ast::Visibility::Public => self.word_nbsp("pub"),
ast::Visibility::Crate(_) => self.word_nbsp("pub(crate)"),
ast::Visibility::Restricted { ref path, .. } => {
let path = to_string(|s| s.print_path(path, false, 0, true));
if path == "self" || path == "super" {
self.word_nbsp(&format!("pub({})", path))
} else {
self.word_nbsp(&format!("pub(in {})", path))
}
}
ast::Visibility::Inherited => Ok(()),
}
}
pub fn print_defaultness(&mut self, defatulness: ast::Defaultness) -> io::Result<()> {
if let ast::Defaultness::Default = defatulness {
self.word_nbsp("default")?;
}
Ok(())
}
pub fn print_struct(
&mut self,
struct_def: &ast::VariantData,
generics: &ast::Generics,
ident: ast::Ident,
span: syntax_pos::Span,
print_finalizer: bool,
) -> io::Result<()> {
self.print_ident(ident)?;
self.print_generics(generics)?;
if !struct_def.is_struct() {
if struct_def.is_tuple() {
self.popen()?;
self.commasep(Inconsistent, struct_def.fields(), |s, field| {
s.maybe_print_comment(field.span.lo)?;
s.print_outer_attributes(&field.attrs)?;
s.print_visibility(&field.vis)?;
s.print_type(&field.ty)
})?;
self.pclose()?;
}
self.print_where_clause(&generics.where_clause)?;
if print_finalizer {
word(&mut self.s, ";")?;
}
self.end()?;
self.end()
} else {
self.print_where_clause(&generics.where_clause)?;
self.nbsp()?;
self.bopen()?;
self.hardbreak_if_not_bol()?;
for field in struct_def.fields() {
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(field.span.lo)?;
self.print_outer_attributes(&field.attrs)?;
self.print_visibility(&field.vis)?;
self.print_ident(field.ident.unwrap())?;
self.word_nbsp(":")?;
self.print_type(&field.ty)?;
word(&mut self.s, ",")?;
}
self.bclose(span)
}
}
pub fn print_variant(&mut self, v: &ast::Variant) -> io::Result<()> {
self.head("")?;
let generics = ast::Generics::default();
self.print_struct(&v.node.data, &generics, v.node.name, v.span, false)?;
match v.node.disr_expr {
Some(ref d) => {
space(&mut self.s)?;
self.word_space("=")?;
self.print_expr(d)
}
_ => Ok(()),
}
}
pub fn print_method_sig(
&mut self,
ident: ast::Ident,
m: &ast::MethodSig,
vis: &ast::Visibility,
) -> io::Result<()> {
self.print_fn(
&m.decl,
m.unsafety,
m.constness.node,
m.abi,
Some(ident),
&m.generics,
vis,
)
}
pub fn print_trait_item(&mut self, ti: &ast::TraitItem) -> io::Result<()> {
self.ann.pre(self, NodeSubItem(ti.id))?;
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(ti.span.lo)?;
self.print_outer_attributes(&ti.attrs)?;
match ti.node {
ast::TraitItemKind::Const(ref ty, ref default) => {
self.print_associated_const(
ti.ident,
ty,
default.as_ref().map(|expr| &**expr),
&ast::Visibility::Inherited,
)?;
}
ast::TraitItemKind::Method(ref sig, ref body) => {
if body.is_some() {
self.head("")?;
}
self.print_method_sig(ti.ident, sig, &ast::Visibility::Inherited)?;
if let Some(ref body) = *body {
self.nbsp()?;
self.print_block_with_attrs(body, &ti.attrs)?;
} else {
word(&mut self.s, ";")?;
}
}
ast::TraitItemKind::Type(ref bounds, ref default) => {
self.print_associated_type(
ti.ident,
Some(bounds),
default.as_ref().map(|ty| &**ty),
)?;
}
ast::TraitItemKind::Macro(codemap::Spanned { ref node, .. }) => {
self.print_path(&node.path, false, 0, false)?;
word(&mut self.s, "! ")?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
self.print_tts(node.stream())?;
self.pclose()?;
word(&mut self.s, ";")?;
self.end()?
}
}
self.ann.post(self, NodeSubItem(ti.id))
}
pub fn print_impl_item(&mut self, ii: &ast::ImplItem) -> io::Result<()> {
self.ann.pre(self, NodeSubItem(ii.id))?;
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(ii.span.lo)?;
self.print_outer_attributes(&ii.attrs)?;
self.print_defaultness(ii.defaultness)?;
match ii.node {
ast::ImplItemKind::Const(ref ty, ref expr) => {
self.print_associated_const(ii.ident, ty, Some(expr), &ii.vis)?;
}
ast::ImplItemKind::Method(ref sig, ref body) => {
self.head("")?;
self.print_method_sig(ii.ident, sig, &ii.vis)?;
self.nbsp()?;
self.print_block_with_attrs(body, &ii.attrs)?;
}
ast::ImplItemKind::Type(ref ty) => {
self.print_associated_type(ii.ident, None, Some(ty))?;
}
ast::ImplItemKind::Macro(codemap::Spanned { ref node, .. }) => {
self.print_path(&node.path, false, 0, false)?;
word(&mut self.s, "! ")?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
self.print_tts(node.stream())?;
self.pclose()?;
word(&mut self.s, ";")?;
self.end()?
}
}
self.ann.post(self, NodeSubItem(ii.id))
}
pub fn print_stmt(&mut self, st: &ast::Stmt) -> io::Result<()> {
self.maybe_print_comment(st.span.lo)?;
match st.node {
ast::StmtKind::Local(ref loc) => {
self.print_outer_attributes(&loc.attrs)?;
self.space_if_not_bol()?;
self.ibox(INDENT_UNIT)?;
self.word_nbsp("let")?;
self.ibox(INDENT_UNIT)?;
self.print_local_decl(loc)?;
self.end()?;
if let Some(ref init) = loc.init {
self.nbsp()?;
self.word_space("=")?;
self.print_expr(init)?;
}
word(&mut self.s, ";")?;
self.end()?;
}
ast::StmtKind::Item(ref item) => self.print_item(item)?,
ast::StmtKind::Expr(ref expr) => {
self.space_if_not_bol()?;
self.print_expr_outer_attr_style(expr, false)?;
if parse::classify::expr_requires_semi_to_be_stmt(expr) {
word(&mut self.s, ";")?;
}
}
ast::StmtKind::Semi(ref expr) => {
self.space_if_not_bol()?;
self.print_expr_outer_attr_style(expr, false)?;
word(&mut self.s, ";")?;
}
ast::StmtKind::Mac(ref mac) => {
let (ref mac, style, ref attrs) = **mac;
self.space_if_not_bol()?;
self.print_outer_attributes(attrs)?;
let delim = match style {
ast::MacStmtStyle::Braces => token::Brace,
_ => token::Paren,
};
self.print_mac(mac, delim)?;
if style == ast::MacStmtStyle::Semicolon {
word(&mut self.s, ";")?;
}
}
}
self.maybe_print_trailing_comment(st.span, None)
}
pub fn print_block(&mut self, blk: &ast::Block) -> io::Result<()> {
self.print_block_with_attrs(blk, &[])
}
pub fn print_block_unclosed(&mut self, blk: &ast::Block) -> io::Result<()> {
self.print_block_unclosed_indent(blk, INDENT_UNIT)
}
pub fn print_block_unclosed_with_attrs(
&mut self,
blk: &ast::Block,
attrs: &[ast::Attribute],
) -> io::Result<()> {
self.print_block_maybe_unclosed(blk, INDENT_UNIT, attrs, false)
}
pub fn print_block_unclosed_indent(
&mut self,
blk: &ast::Block,
indented: usize,
) -> io::Result<()> {
self.print_block_maybe_unclosed(blk, indented, &[], false)
}
pub fn print_block_with_attrs(
&mut self,
blk: &ast::Block,
attrs: &[ast::Attribute],
) -> io::Result<()> {
self.print_block_maybe_unclosed(blk, INDENT_UNIT, attrs, true)
}
pub fn print_block_maybe_unclosed(
&mut self,
blk: &ast::Block,
indented: usize,
attrs: &[ast::Attribute],
close_box: bool,
) -> io::Result<()> {
match blk.rules {
BlockCheckMode::Unsafe(..) => self.word_space("unsafe")?,
BlockCheckMode::Default => (),
}
self.maybe_print_comment(blk.span.lo)?;
self.ann.pre(self, NodeBlock(blk))?;
self.bopen()?;
self.print_inner_attributes(attrs)?;
for (i, st) in blk.stmts.iter().enumerate() {
match st.node {
ast::StmtKind::Expr(ref expr) if i == blk.stmts.len() - 1 => {
self.maybe_print_comment(st.span.lo)?;
self.space_if_not_bol()?;
self.print_expr_outer_attr_style(expr, false)?;
self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi))?;
}
_ => self.print_stmt(st)?,
}
}
self.bclose_maybe_open(blk.span, indented, close_box)?;
self.ann.post(self, NodeBlock(blk))
}
fn print_else(&mut self, els: Option<&ast::Expr>) -> io::Result<()> {
match els {
Some(_else) => {
match _else.node {
ast::ExprKind::If(ref i, ref then, ref e) => {
self.cbox(INDENT_UNIT - 1)?;
self.ibox(0)?;
word(&mut self.s, " else if ")?;
self.print_expr(i)?;
space(&mut self.s)?;
self.print_block(then)?;
self.print_else(e.as_ref().map(|e| &**e))
}
ast::ExprKind::IfLet(ref pat, ref expr, ref then, ref e) => {
self.cbox(INDENT_UNIT - 1)?;
self.ibox(0)?;
word(&mut self.s, " else if let ")?;
self.print_pat(pat)?;
space(&mut self.s)?;
self.word_space("=")?;
self.print_expr(expr)?;
space(&mut self.s)?;
self.print_block(then)?;
self.print_else(e.as_ref().map(|e| &**e))
}
ast::ExprKind::Block(ref b) => {
self.cbox(INDENT_UNIT - 1)?;
self.ibox(0)?;
word(&mut self.s, " else ")?;
self.print_block(b)
}
_ => {
panic!("print_if saw if with weird alternative");
}
}
}
_ => Ok(()),
}
}
pub fn print_if(
&mut self,
test: &ast::Expr,
blk: &ast::Block,
elseopt: Option<&ast::Expr>,
) -> io::Result<()> {
self.head("if")?;
self.print_expr(test)?;
space(&mut self.s)?;
self.print_block(blk)?;
self.print_else(elseopt)
}
pub fn print_if_let(
&mut self,
pat: &ast::Pat,
expr: &ast::Expr,
blk: &ast::Block,
elseopt: Option<&ast::Expr>,
) -> io::Result<()> {
self.head("if let")?;
self.print_pat(pat)?;
space(&mut self.s)?;
self.word_space("=")?;
self.print_expr(expr)?;
space(&mut self.s)?;
self.print_block(blk)?;
self.print_else(elseopt)
}
pub fn print_mac(&mut self, m: &ast::Mac, delim: token::DelimToken) -> io::Result<()> {
self.print_path(&m.node.path, false, 0, false)?;
word(&mut self.s, "!")?;
match delim {
token::Paren => self.popen()?,
token::Bracket => word(&mut self.s, "[")?,
token::Brace => {
self.head("")?;
self.bopen()?;
}
token::NoDelim => {}
}
self.print_tts(m.node.stream())?;
match delim {
token::Paren => self.pclose(),
token::Bracket => word(&mut self.s, "]"),
token::Brace => self.bclose(m.span),
token::NoDelim => Ok(()),
}
}
fn print_call_post(&mut self, args: &[P<ast::Expr>]) -> io::Result<()> {
self.popen()?;
self.commasep_exprs(Inconsistent, args)?;
self.pclose()
}
pub fn check_expr_bin_needs_paren(&mut self, sub_expr: &ast::Expr, binop: ast::BinOp) -> bool {
match sub_expr.node {
ast::ExprKind::Binary(ref sub_op, _, _) => {
AssocOp::from_ast_binop(sub_op.node).precedence()
< AssocOp::from_ast_binop(binop.node).precedence()
}
_ => true,
}
}
pub fn print_expr_maybe_paren(&mut self, expr: &ast::Expr) -> io::Result<()> {
let needs_par = needs_parentheses(expr);
if needs_par {
self.popen()?;
}
self.print_expr(expr)?;
if needs_par {
self.pclose()?;
}
Ok(())
}
fn print_expr_in_place(&mut self, place: &ast::Expr, expr: &ast::Expr) -> io::Result<()> {
self.print_expr_maybe_paren(place)?;
space(&mut self.s)?;
self.word_space("<-")?;
self.print_expr_maybe_paren(expr)
}
fn print_expr_vec(&mut self, exprs: &[P<ast::Expr>], attrs: &[Attribute]) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
word(&mut self.s, "[")?;
self.print_inner_attributes_inline(attrs)?;
self.commasep_exprs(Inconsistent, &exprs[..])?;
word(&mut self.s, "]")?;
self.end()
}
fn print_expr_repeat(
&mut self,
element: &ast::Expr,
count: &ast::Expr,
attrs: &[Attribute],
) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
word(&mut self.s, "[")?;
self.print_inner_attributes_inline(attrs)?;
self.print_expr(element)?;
self.word_space(";")?;
self.print_expr(count)?;
word(&mut self.s, "]")?;
self.end()
}
fn print_expr_struct(
&mut self,
path: &ast::Path,
fields: &[ast::Field],
wth: &Option<P<ast::Expr>>,
attrs: &[Attribute],
) -> io::Result<()> {
self.print_path(path, true, 0, false)?;
word(&mut self.s, "{")?;
self.print_inner_attributes_inline(attrs)?;
self.commasep_cmnt(
Consistent,
&fields[..],
|s, field| {
s.ibox(INDENT_UNIT)?;
if !field.is_shorthand {
s.print_ident(field.ident.node)?;
s.word_space(":")?;
}
s.print_expr(&field.expr)?;
s.end()
},
|f| f.span,
)?;
match *wth {
Some(ref expr) => {
self.ibox(INDENT_UNIT)?;
if !fields.is_empty() {
word(&mut self.s, ",")?;
space(&mut self.s)?;
}
word(&mut self.s, "..")?;
self.print_expr(expr)?;
self.end()?;
}
_ => {
if !fields.is_empty() {
word(&mut self.s, ",")?
}
}
}
word(&mut self.s, "}")?;
Ok(())
}
fn print_expr_tup(&mut self, exprs: &[P<ast::Expr>], attrs: &[Attribute]) -> io::Result<()> {
self.popen()?;
self.print_inner_attributes_inline(attrs)?;
self.commasep_exprs(Inconsistent, &exprs[..])?;
if exprs.len() == 1 {
word(&mut self.s, ",")?;
}
self.pclose()
}
fn print_expr_call(&mut self, func: &ast::Expr, args: &[P<ast::Expr>]) -> io::Result<()> {
self.print_expr_maybe_paren(func)?;
self.print_call_post(args)
}
fn print_expr_method_call(
&mut self,
ident: ast::SpannedIdent,
tys: &[P<ast::Ty>],
args: &[P<ast::Expr>],
) -> io::Result<()> {
let base_args = &args[1..];
self.print_expr(&args[0])?;
word(&mut self.s, ".")?;
self.print_ident(ident.node)?;
if !tys.is_empty() {
word(&mut self.s, "::<")?;
self.commasep(Inconsistent, tys, |s, ty| s.print_type(ty))?;
word(&mut self.s, ">")?;
}
self.print_call_post(base_args)
}
fn print_expr_binary(
&mut self,
op: ast::BinOp,
lhs: &ast::Expr,
rhs: &ast::Expr,
) -> io::Result<()> {
if self.check_expr_bin_needs_paren(lhs, op) {
self.print_expr_maybe_paren(lhs)?;
} else {
self.print_expr(lhs)?;
}
space(&mut self.s)?;
self.word_space(op.node.to_string())?;
if self.check_expr_bin_needs_paren(rhs, op) {
self.print_expr_maybe_paren(rhs)
} else {
self.print_expr(rhs)
}
}
fn print_expr_unary(&mut self, op: ast::UnOp, expr: &ast::Expr) -> io::Result<()> {
word(&mut self.s, ast::UnOp::to_string(op))?;
self.print_expr_maybe_paren(expr)
}
fn print_expr_addr_of(
&mut self,
mutability: ast::Mutability,
expr: &ast::Expr,
) -> io::Result<()> {
word(&mut self.s, "&")?;
self.print_mutability(mutability)?;
self.print_expr_maybe_paren(expr)
}
pub fn print_expr(&mut self, expr: &ast::Expr) -> io::Result<()> {
self.print_expr_outer_attr_style(expr, true)
}
fn print_expr_outer_attr_style(&mut self, expr: &ast::Expr, is_inline: bool) -> io::Result<()> {
self.maybe_print_comment(expr.span.lo)?;
let attrs = &expr.attrs;
if is_inline {
self.print_outer_attributes_inline(attrs)?;
} else {
self.print_outer_attributes(attrs)?;
}
self.ibox(INDENT_UNIT)?;
self.ann.pre(self, NodeExpr(expr))?;
match expr.node {
ast::ExprKind::Box(ref expr) => {
self.word_space("box")?;
self.print_expr(expr)?;
}
ast::ExprKind::InPlace(ref place, ref expr) => {
self.print_expr_in_place(place, expr)?;
}
ast::ExprKind::Array(ref exprs) => {
self.print_expr_vec(&exprs[..], attrs)?;
}
ast::ExprKind::Repeat(ref element, ref count) => {
self.print_expr_repeat(element, count, attrs)?;
}
ast::ExprKind::Struct(ref path, ref fields, ref wth) => {
self.print_expr_struct(path, &fields[..], wth, attrs)?;
}
ast::ExprKind::Tup(ref exprs) => {
self.print_expr_tup(&exprs[..], attrs)?;
}
ast::ExprKind::Call(ref func, ref args) => {
self.print_expr_call(func, &args[..])?;
}
ast::ExprKind::MethodCall(ident, ref tys, ref args) => {
self.print_expr_method_call(ident, &tys[..], &args[..])?;
}
ast::ExprKind::Binary(op, ref lhs, ref rhs) => {
self.print_expr_binary(op, lhs, rhs)?;
}
ast::ExprKind::Unary(op, ref expr) => {
self.print_expr_unary(op, expr)?;
}
ast::ExprKind::AddrOf(m, ref expr) => {
self.print_expr_addr_of(m, expr)?;
}
ast::ExprKind::Lit(ref lit) => {
self.print_literal(lit)?;
}
ast::ExprKind::Cast(ref expr, ref ty) => {
if let ast::ExprKind::Cast(..) = expr.node {
self.print_expr(expr)?;
} else {
self.print_expr_maybe_paren(expr)?;
}
space(&mut self.s)?;
self.word_space("as")?;
self.print_type(ty)?;
}
ast::ExprKind::Type(ref expr, ref ty) => {
self.print_expr(expr)?;
self.word_space(":")?;
self.print_type(ty)?;
}
ast::ExprKind::If(ref test, ref blk, ref elseopt) => {
self.print_if(test, blk, elseopt.as_ref().map(|e| &**e))?;
}
ast::ExprKind::IfLet(ref pat, ref expr, ref blk, ref elseopt) => {
self.print_if_let(pat, expr, blk, elseopt.as_ref().map(|e| &**e))?;
}
ast::ExprKind::While(ref test, ref blk, opt_ident) => {
if let Some(ident) = opt_ident {
self.print_ident(ident.node)?;
self.word_space(":")?;
}
self.head("while")?;
self.print_expr(test)?;
space(&mut self.s)?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::WhileLet(ref pat, ref expr, ref blk, opt_ident) => {
if let Some(ident) = opt_ident {
self.print_ident(ident.node)?;
self.word_space(":")?;
}
self.head("while let")?;
self.print_pat(pat)?;
space(&mut self.s)?;
self.word_space("=")?;
self.print_expr(expr)?;
space(&mut self.s)?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::ForLoop(ref pat, ref iter, ref blk, opt_ident) => {
if let Some(ident) = opt_ident {
self.print_ident(ident.node)?;
self.word_space(":")?;
}
self.head("for")?;
self.print_pat(pat)?;
space(&mut self.s)?;
self.word_space("in")?;
self.print_expr(iter)?;
space(&mut self.s)?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::Loop(ref blk, opt_ident) => {
if let Some(ident) = opt_ident {
self.print_ident(ident.node)?;
self.word_space(":")?;
}
self.head("loop")?;
space(&mut self.s)?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::Match(ref expr, ref arms) => {
self.cbox(INDENT_UNIT)?;
self.ibox(4)?;
self.word_nbsp("match")?;
self.print_expr(expr)?;
space(&mut self.s)?;
self.bopen()?;
self.print_inner_attributes_no_trailing_hardbreak(attrs)?;
for arm in arms {
self.print_arm(arm)?;
}
self.bclose_(expr.span, INDENT_UNIT)?;
}
ast::ExprKind::Closure(capture_clause, ref decl, ref body, _) => {
self.print_capture_clause(capture_clause)?;
self.print_fn_block_args(decl)?;
space(&mut self.s)?;
self.print_expr(body)?;
self.end()?;
self.ibox(0)?;
}
ast::ExprKind::Block(ref blk) => {
self.cbox(INDENT_UNIT)?;
self.ibox(0)?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::Assign(ref lhs, ref rhs) => {
self.print_expr(lhs)?;
space(&mut self.s)?;
self.word_space("=")?;
self.print_expr(rhs)?;
}
ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
self.print_expr(lhs)?;
space(&mut self.s)?;
word(&mut self.s, op.node.to_string())?;
self.word_space("=")?;
self.print_expr(rhs)?;
}
ast::ExprKind::Field(ref expr, id) => {
self.print_expr(expr)?;
word(&mut self.s, ".")?;
self.print_ident(id.node)?;
}
ast::ExprKind::TupField(ref expr, id) => {
self.print_expr(expr)?;
word(&mut self.s, ".")?;
self.print_usize(id.node)?;
}
ast::ExprKind::Index(ref expr, ref index) => {
self.print_expr(expr)?;
word(&mut self.s, "[")?;
self.print_expr(index)?;
word(&mut self.s, "]")?;
}
ast::ExprKind::Range(ref start, ref end, limits) => {
if let Some(ref e) = *start {
self.print_expr(e)?;
}
if limits == ast::RangeLimits::HalfOpen {
word(&mut self.s, "..")?;
} else {
word(&mut self.s, "...")?;
}
if let Some(ref e) = *end {
self.print_expr(e)?;
}
}
ast::ExprKind::Path(None, ref path) => self.print_path(path, true, 0, false)?,
ast::ExprKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, true)?
}
ast::ExprKind::Break(opt_ident, ref opt_expr) => {
word(&mut self.s, "break")?;
space(&mut self.s)?;
if let Some(ident) = opt_ident {
self.print_ident(ident.node)?;
space(&mut self.s)?;
}
if let Some(ref expr) = *opt_expr {
self.print_expr(expr)?;
space(&mut self.s)?;
}
}
ast::ExprKind::Continue(opt_ident) => {
word(&mut self.s, "continue")?;
space(&mut self.s)?;
if let Some(ident) = opt_ident {
self.print_ident(ident.node)?;
space(&mut self.s)?
}
}
ast::ExprKind::Ret(ref result) => {
word(&mut self.s, "return")?;
if let Some(ref expr) = *result {
word(&mut self.s, " ")?;
self.print_expr(expr)?;
}
}
ast::ExprKind::InlineAsm(ref a) => {
word(&mut self.s, "asm!")?;
self.popen()?;
self.print_string(&a.asm.as_str(), a.asm_str_style)?;
self.word_space(":")?;
self.commasep(Inconsistent, &a.outputs, |s, out| {
let constraint = out.constraint.as_str();
let mut ch = constraint.chars();
match ch.next() {
Some('=') if out.is_rw => {
s.print_string(&format!("+{}", ch.as_str()), ast::StrStyle::Cooked)?
}
_ => s.print_string(&constraint, ast::StrStyle::Cooked)?,
}
s.popen()?;
s.print_expr(&out.expr)?;
s.pclose()?;
Ok(())
})?;
space(&mut self.s)?;
self.word_space(":")?;
self.commasep(Inconsistent, &a.inputs, |s, &(co, ref o)| {
s.print_string(&co.as_str(), ast::StrStyle::Cooked)?;
s.popen()?;
s.print_expr(o)?;
s.pclose()?;
Ok(())
})?;
space(&mut self.s)?;
self.word_space(":")?;
self.commasep(Inconsistent, &a.clobbers, |s, co| {
s.print_string(&co.as_str(), ast::StrStyle::Cooked)?;
Ok(())
})?;
let mut options = vec![];
if a.volatile {
options.push("volatile");
}
if a.alignstack {
options.push("alignstack");
}
if a.dialect == ast::AsmDialect::Intel {
options.push("intel");
}
if !options.is_empty() {
space(&mut self.s)?;
self.word_space(":")?;
self.commasep(Inconsistent, &options, |s, &co| {
s.print_string(co, ast::StrStyle::Cooked)?;
Ok(())
})?;
}
self.pclose()?;
}
ast::ExprKind::Mac(ref m) => self.print_mac(m, token::Paren)?,
ast::ExprKind::Paren(ref e) => {
self.popen()?;
self.print_inner_attributes_inline(attrs)?;
self.print_expr(e)?;
self.pclose()?;
}
ast::ExprKind::Try(ref e) => {
self.print_expr(e)?;
word(&mut self.s, "?")?
}
ast::ExprKind::Catch(ref blk) => {
self.head("do catch")?;
space(&mut self.s)?;
self.print_block_with_attrs(blk, attrs)?
}
}
self.ann.post(self, NodeExpr(expr))?;
self.end()
}
pub fn print_local_decl(&mut self, loc: &ast::Local) -> io::Result<()> {
self.print_pat(&loc.pat)?;
if let Some(ref ty) = loc.ty {
self.word_space(":")?;
self.print_type(ty)?;
}
Ok(())
}
pub fn print_ident(&mut self, ident: ast::Ident) -> io::Result<()> {
word(&mut self.s, &ident.name.as_str())?;
self.ann.post(self, NodeIdent(&ident))
}
pub fn print_usize(&mut self, i: usize) -> io::Result<()> {
word(&mut self.s, &i.to_string())
}
pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> {
word(&mut self.s, &name.as_str())?;
self.ann.post(self, NodeName(&name))
}
pub fn print_for_decl(&mut self, loc: &ast::Local, coll: &ast::Expr) -> io::Result<()> {
self.print_local_decl(loc)?;
space(&mut self.s)?;
self.word_space("in")?;
self.print_expr(coll)
}
fn print_path(
&mut self,
path: &ast::Path,
colons_before_params: bool,
depth: usize,
defaults_to_global: bool,
) -> io::Result<()> {
self.maybe_print_comment(path.span.lo)?;
let mut segments = path.segments[..path.segments.len() - depth].iter();
if defaults_to_global && path.is_global() {
segments.next();
}
for (i, segment) in segments.enumerate() {
if i > 0 {
word(&mut self.s, "::")?
}
if segment.identifier.name != keywords::CrateRoot.name()
&& segment.identifier.name != "$crate"
{
self.print_ident(segment.identifier)?;
if let Some(ref parameters) = segment.parameters {
self.print_path_parameters(parameters, colons_before_params)?;
}
}
}
Ok(())
}
fn print_qpath(
&mut self,
path: &ast::Path,
qself: &ast::QSelf,
colons_before_params: bool,
) -> io::Result<()> {
word(&mut self.s, "<")?;
self.print_type(&qself.ty)?;
if qself.position > 0 {
space(&mut self.s)?;
self.word_space("as")?;
let depth = path.segments.len() - qself.position;
self.print_path(path, false, depth, false)?;
}
word(&mut self.s, ">")?;
word(&mut self.s, "::")?;
let item_segment = path.segments.last().unwrap();
self.print_ident(item_segment.identifier)?;
match item_segment.parameters {
Some(ref parameters) => self.print_path_parameters(parameters, colons_before_params),
None => Ok(()),
}
}
fn print_path_parameters(
&mut self,
parameters: &ast::PathParameters,
colons_before_params: bool,
) -> io::Result<()> {
if colons_before_params {
word(&mut self.s, "::")?
}
match *parameters {
ast::PathParameters::AngleBracketed(ref data) => {
word(&mut self.s, "<")?;
let mut comma = false;
for lifetime in &data.lifetimes {
if comma {
self.word_space(",")?
}
self.print_lifetime(lifetime)?;
comma = true;
}
if !data.types.is_empty() {
if comma {
self.word_space(",")?
}
self.commasep(Inconsistent, &data.types, |s, ty| s.print_type(ty))?;
comma = true;
}
for binding in data.bindings.iter() {
if comma {
self.word_space(",")?
}
self.print_ident(binding.ident)?;
space(&mut self.s)?;
self.word_space("=")?;
self.print_type(&binding.ty)?;
comma = true;
}
word(&mut self.s, ">")?
}
ast::PathParameters::Parenthesized(ref data) => {
word(&mut self.s, "(")?;
self.commasep(Inconsistent, &data.inputs, |s, ty| s.print_type(ty))?;
word(&mut self.s, ")")?;
if let Some(ref ty) = data.output {
self.space_if_not_bol()?;
self.word_space("->")?;
self.print_type(ty)?;
}
}
}
Ok(())
}
pub fn print_pat(&mut self, pat: &ast::Pat) -> io::Result<()> {
self.maybe_print_comment(pat.span.lo)?;
self.ann.pre(self, NodePat(pat))?;
match pat.node {
PatKind::Wild => word(&mut self.s, "_")?,
PatKind::Ident(binding_mode, ref path1, ref sub) => {
match binding_mode {
ast::BindingMode::ByRef(mutbl) => {
self.word_nbsp("ref")?;
self.print_mutability(mutbl)?;
}
ast::BindingMode::ByValue(ast::Mutability::Immutable) => {}
ast::BindingMode::ByValue(ast::Mutability::Mutable) => {
self.word_nbsp("mut")?;
}
}
self.print_ident(path1.node)?;
if let Some(ref p) = *sub {
word(&mut self.s, "@")?;
self.print_pat(p)?;
}
}
PatKind::TupleStruct(ref path, ref elts, ddpos) => {
self.print_path(path, true, 0, false)?;
self.popen()?;
if let Some(ddpos) = ddpos {
self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(p))?;
if ddpos != 0 {
self.word_space(",")?;
}
word(&mut self.s, "..")?;
if ddpos != elts.len() {
word(&mut self.s, ",")?;
self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(p))?;
}
} else {
self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(p))?;
}
self.pclose()?;
}
PatKind::Path(None, ref path) => {
self.print_path(path, true, 0, false)?;
}
PatKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, false)?;
}
PatKind::Struct(ref path, ref fields, etc) => {
self.print_path(path, true, 0, false)?;
self.nbsp()?;
self.word_space("{")?;
self.commasep_cmnt(
Consistent,
&fields[..],
|s, f| {
s.cbox(INDENT_UNIT)?;
if !f.node.is_shorthand {
s.print_ident(f.node.ident)?;
s.word_nbsp(":")?;
}
s.print_pat(&f.node.pat)?;
s.end()
},
|f| f.node.pat.span,
)?;
if etc {
if !fields.is_empty() {
self.word_space(",")?;
}
word(&mut self.s, "..")?;
}
space(&mut self.s)?;
word(&mut self.s, "}")?;
}
PatKind::Tuple(ref elts, ddpos) => {
self.popen()?;
if let Some(ddpos) = ddpos {
self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(p))?;
if ddpos != 0 {
self.word_space(",")?;
}
word(&mut self.s, "..")?;
if ddpos != elts.len() {
word(&mut self.s, ",")?;
self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(p))?;
}
} else {
self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(p))?;
if elts.len() == 1 {
word(&mut self.s, ",")?;
}
}
self.pclose()?;
}
PatKind::Box(ref inner) => {
word(&mut self.s, "box ")?;
self.print_pat(inner)?;
}
PatKind::Ref(ref inner, mutbl) => {
word(&mut self.s, "&")?;
if mutbl == ast::Mutability::Mutable {
word(&mut self.s, "mut ")?;
}
self.print_pat(inner)?;
}
PatKind::Lit(ref e) => self.print_expr(&**e)?,
PatKind::Range(ref begin, ref end, ref end_kind) => {
self.print_expr(begin)?;
space(&mut self.s)?;
match *end_kind {
RangeEnd::Included => word(&mut self.s, "...")?,
RangeEnd::Excluded => word(&mut self.s, "..")?,
}
self.print_expr(end)?;
}
PatKind::Slice(ref before, ref slice, ref after) => {
word(&mut self.s, "[")?;
self.commasep(Inconsistent, &before[..], |s, p| s.print_pat(p))?;
if let Some(ref p) = *slice {
if !before.is_empty() {
self.word_space(",")?;
}
if p.node != PatKind::Wild {
self.print_pat(p)?;
}
word(&mut self.s, "..")?;
if !after.is_empty() {
self.word_space(",")?;
}
}
self.commasep(Inconsistent, &after[..], |s, p| s.print_pat(p))?;
word(&mut self.s, "]")?;
}
PatKind::Mac(ref m) => self.print_mac(m, token::Paren)?,
}
self.ann.post(self, NodePat(pat))
}
fn print_arm(&mut self, arm: &ast::Arm) -> io::Result<()> {
if arm.attrs.is_empty() {
space(&mut self.s)?;
}
self.cbox(INDENT_UNIT)?;
self.ibox(0)?;
self.maybe_print_comment(arm.pats[0].span.lo)?;
self.print_outer_attributes(&arm.attrs)?;
let mut first = true;
for p in &arm.pats {
if first {
first = false;
} else {
space(&mut self.s)?;
self.word_space("|")?;
}
self.print_pat(p)?;
}
space(&mut self.s)?;
if let Some(ref e) = arm.guard {
self.word_space("if")?;
self.print_expr(e)?;
space(&mut self.s)?;
}
self.word_space("=>")?;
match arm.body.node {
ast::ExprKind::Block(ref blk) => {
self.print_block_unclosed_indent(blk, INDENT_UNIT)?;
if let BlockCheckMode::Unsafe(ast::UserProvided) = blk.rules {
word(&mut self.s, ",")?;
}
}
_ => {
self.end()?;
self.print_expr(&arm.body)?;
word(&mut self.s, ",")?;
}
}
self.end()
}
fn print_explicit_self(&mut self, explicit_self: &ast::ExplicitSelf) -> io::Result<()> {
match explicit_self.node {
SelfKind::Value(m) => {
self.print_mutability(m)?;
word(&mut self.s, "self")
}
SelfKind::Region(ref lt, m) => {
word(&mut self.s, "&")?;
self.print_opt_lifetime(lt)?;
self.print_mutability(m)?;
word(&mut self.s, "self")
}
SelfKind::Explicit(ref typ, m) => {
self.print_mutability(m)?;
word(&mut self.s, "self")?;
self.word_space(":")?;
self.print_type(typ)
}
}
}
pub fn print_fn(
&mut self,
decl: &ast::FnDecl,
unsafety: ast::Unsafety,
constness: ast::Constness,
abi: abi::Abi,
name: Option<ast::Ident>,
generics: &ast::Generics,
vis: &ast::Visibility,
) -> io::Result<()> {
self.print_fn_header_info(unsafety, constness, abi, vis)?;
if let Some(name) = name {
self.nbsp()?;
self.print_ident(name)?;
}
self.print_generics(generics)?;
self.print_fn_args_and_ret(decl)?;
self.print_where_clause(&generics.where_clause)
}
pub fn print_fn_args_and_ret(&mut self, decl: &ast::FnDecl) -> io::Result<()> {
self.popen()?;
self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, false))?;
if decl.variadic {
word(&mut self.s, ", ...")?;
}
self.pclose()?;
self.print_fn_output(decl)
}
pub fn print_fn_block_args(&mut self, decl: &ast::FnDecl) -> io::Result<()> {
word(&mut self.s, "|")?;
self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, true))?;
word(&mut self.s, "|")?;
if let ast::FunctionRetTy::Default(..) = decl.output {
return Ok(());
}
self.space_if_not_bol()?;
self.word_space("->")?;
match decl.output {
ast::FunctionRetTy::Ty(ref ty) => {
self.print_type(ty)?;
self.maybe_print_comment(ty.span.lo)
}
ast::FunctionRetTy::Default(..) => unreachable!(),
}
}
pub fn print_capture_clause(&mut self, capture_clause: ast::CaptureBy) -> io::Result<()> {
match capture_clause {
ast::CaptureBy::Value => self.word_space("move"),
ast::CaptureBy::Ref => Ok(()),
}
}
pub fn print_bounds(&mut self, prefix: &str, bounds: &[ast::TyParamBound]) -> io::Result<()> {
if !bounds.is_empty() {
word(&mut self.s, prefix)?;
let mut first = true;
for bound in bounds {
self.nbsp()?;
if first {
first = false;
} else {
self.word_space("+")?;
}
(match *bound {
TraitTyParamBound(ref tref, TraitBoundModifier::None) => {
self.print_poly_trait_ref(tref)
}
TraitTyParamBound(ref tref, TraitBoundModifier::Maybe) => {
word(&mut self.s, "?")?;
self.print_poly_trait_ref(tref)
}
RegionTyParamBound(ref lt) => self.print_lifetime(lt),
})?
}
Ok(())
} else {
Ok(())
}
}
pub fn print_lifetime(&mut self, lifetime: &ast::Lifetime) -> io::Result<()> {
self.print_name(lifetime.ident.name)
}
pub fn print_lifetime_bounds(
&mut self,
lifetime: &ast::Lifetime,
bounds: &[ast::Lifetime],
) -> io::Result<()> {
self.print_lifetime(lifetime)?;
if !bounds.is_empty() {
word(&mut self.s, ": ")?;
for (i, bound) in bounds.iter().enumerate() {
if i != 0 {
word(&mut self.s, " + ")?;
}
self.print_lifetime(bound)?;
}
}
Ok(())
}
pub fn print_generics(&mut self, generics: &ast::Generics) -> io::Result<()> {
let total = generics.lifetimes.len() + generics.ty_params.len();
if total == 0 {
return Ok(());
}
word(&mut self.s, "<")?;
let mut ints = Vec::new();
for i in 0..total {
ints.push(i);
}
self.commasep(Inconsistent, &ints[..], |s, &idx| {
if idx < generics.lifetimes.len() {
let lifetime_def = &generics.lifetimes[idx];
s.print_outer_attributes_inline(&lifetime_def.attrs)?;
s.print_lifetime_bounds(&lifetime_def.lifetime, &lifetime_def.bounds)
} else {
let idx = idx - generics.lifetimes.len();
let param = &generics.ty_params[idx];
s.print_ty_param(param)
}
})?;
word(&mut self.s, ">")?;
Ok(())
}
pub fn print_ty_param(&mut self, param: &ast::TyParam) -> io::Result<()> {
self.print_outer_attributes_inline(¶m.attrs)?;
self.print_ident(param.ident)?;
self.print_bounds(":", ¶m.bounds)?;
match param.default {
Some(ref default) => {
space(&mut self.s)?;
self.word_space("=")?;
self.print_type(default)
}
_ => Ok(()),
}
}
pub fn print_where_clause(&mut self, where_clause: &ast::WhereClause) -> io::Result<()> {
if where_clause.predicates.is_empty() {
return Ok(());
}
space(&mut self.s)?;
self.word_space("where")?;
for (i, predicate) in where_clause.predicates.iter().enumerate() {
if i != 0 {
self.word_space(",")?;
}
match *predicate {
ast::WherePredicate::BoundPredicate(ast::WhereBoundPredicate {
ref bound_lifetimes,
ref bounded_ty,
ref bounds,
..
}) => {
self.print_formal_lifetime_list(bound_lifetimes)?;
self.print_type(bounded_ty)?;
self.print_bounds(":", bounds)?;
}
ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate {
ref lifetime,
ref bounds,
..
}) => {
self.print_lifetime_bounds(lifetime, bounds)?;
}
ast::WherePredicate::EqPredicate(ast::WhereEqPredicate {
ref lhs_ty,
ref rhs_ty,
..
}) => {
self.print_type(lhs_ty)?;
space(&mut self.s)?;
self.word_space("=")?;
self.print_type(rhs_ty)?;
}
}
}
Ok(())
}
pub fn print_view_path(&mut self, vp: &ast::ViewPath) -> io::Result<()> {
match vp.node {
ast::ViewPathSimple(ident, ref path) => {
self.print_path(path, false, 0, true)?;
if path.segments.last().unwrap().identifier.name != ident.name {
space(&mut self.s)?;
self.word_space("as")?;
self.print_ident(ident)?;
}
Ok(())
}
ast::ViewPathGlob(ref path) => {
self.print_path(path, false, 0, true)?;
word(&mut self.s, "::*")
}
ast::ViewPathList(ref path, ref idents) => {
if path.segments.is_empty() {
word(&mut self.s, "{")?;
} else {
self.print_path(path, false, 0, true)?;
word(&mut self.s, "::{")?;
}
self.commasep(Inconsistent, &idents[..], |s, w| {
s.print_ident(w.node.name)?;
if let Some(ident) = w.node.rename {
space(&mut s.s)?;
s.word_space("as")?;
s.print_ident(ident)?;
}
Ok(())
})?;
word(&mut self.s, "}")
}
}
}
pub fn print_mutability(&mut self, mutbl: ast::Mutability) -> io::Result<()> {
match mutbl {
ast::Mutability::Mutable => self.word_nbsp("mut"),
ast::Mutability::Immutable => Ok(()),
}
}
pub fn print_mt(&mut self, mt: &ast::MutTy) -> io::Result<()> {
self.print_mutability(mt.mutbl)?;
self.print_type(&mt.ty)
}
pub fn print_arg(&mut self, input: &ast::Arg, is_closure: bool) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
match input.ty.node {
ast::TyKind::Infer if is_closure => self.print_pat(&input.pat)?,
_ => {
if let Some(eself) = input.to_self() {
self.print_explicit_self(&eself)?;
} else {
let invalid = if let PatKind::Ident(_, ident, _) = input.pat.node {
ident.node.name == keywords::Invalid.name()
} else {
false
};
if !invalid {
self.print_pat(&input.pat)?;
word(&mut self.s, ":")?;
space(&mut self.s)?;
}
self.print_type(&input.ty)?;
}
}
}
self.end()
}
pub fn print_fn_output(&mut self, decl: &ast::FnDecl) -> io::Result<()> {
if let ast::FunctionRetTy::Default(..) = decl.output {
return Ok(());
}
self.space_if_not_bol()?;
self.ibox(INDENT_UNIT)?;
self.word_space("->")?;
match decl.output {
ast::FunctionRetTy::Default(..) => unreachable!(),
ast::FunctionRetTy::Ty(ref ty) => self.print_type(ty)?,
}
self.end()?;
match decl.output {
ast::FunctionRetTy::Ty(ref output) => self.maybe_print_comment(output.span.lo),
_ => Ok(()),
}
}
pub fn print_ty_fn(
&mut self,
abi: abi::Abi,
unsafety: ast::Unsafety,
decl: &ast::FnDecl,
name: Option<ast::Ident>,
generics: &ast::Generics,
) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
if !generics.lifetimes.is_empty() || !generics.ty_params.is_empty() {
word(&mut self.s, "for")?;
self.print_generics(generics)?;
}
let generics = ast::Generics {
lifetimes: Vec::new(),
ty_params: Vec::new(),
where_clause: ast::WhereClause {
id: ast::DUMMY_NODE_ID,
predicates: Vec::new(),
},
span: syntax_pos::DUMMY_SP,
};
self.print_fn(
decl,
unsafety,
ast::Constness::NotConst,
abi,
name,
&generics,
&ast::Visibility::Inherited,
)?;
self.end()
}
pub fn maybe_print_trailing_comment(
&mut self,
span: syntax_pos::Span,
next_pos: Option<BytePos>,
) -> io::Result<()> {
let cm = match self.cm {
Some(cm) => cm,
_ => return Ok(()),
};
if let Some(ref cmnt) = self.next_comment() {
if cmnt.style != comments::Trailing {
return Ok(());
}
let span_line = cm.lookup_char_pos(span.hi);
let comment_line = cm.lookup_char_pos(cmnt.pos);
let next = next_pos.unwrap_or(cmnt.pos + BytePos(1));
if span.hi < cmnt.pos && cmnt.pos < next && span_line.line == comment_line.line {
self.print_comment(cmnt)?;
self.cur_cmnt_and_lit.cur_cmnt += 1;
}
}
Ok(())
}
pub fn print_remaining_comments(&mut self) -> io::Result<()> {
if self.next_comment().is_none() {
hardbreak(&mut self.s)?;
}
while let Some(ref cmnt) = self.next_comment() {
self.print_comment(cmnt)?;
self.cur_cmnt_and_lit.cur_cmnt += 1;
}
Ok(())
}
pub fn print_opt_abi_and_extern_if_nondefault(
&mut self,
opt_abi: Option<Abi>,
) -> io::Result<()> {
match opt_abi {
Some(Abi::Rust) => Ok(()),
Some(abi) => {
self.word_nbsp("extern")?;
self.word_nbsp(&abi.to_string())
}
None => Ok(()),
}
}
pub fn print_extern_opt_abi(&mut self, opt_abi: Option<Abi>) -> io::Result<()> {
match opt_abi {
Some(abi) => {
self.word_nbsp("extern")?;
self.word_nbsp(&abi.to_string())
}
None => Ok(()),
}
}
pub fn print_fn_header_info(
&mut self,
unsafety: ast::Unsafety,
constness: ast::Constness,
abi: Abi,
vis: &ast::Visibility,
) -> io::Result<()> {
word(&mut self.s, &visibility_qualified(vis, ""))?;
match constness {
ast::Constness::NotConst => {}
ast::Constness::Const => self.word_nbsp("const")?,
}
self.print_unsafety(unsafety)?;
if abi != Abi::Rust {
self.word_nbsp("extern")?;
self.word_nbsp(&abi.to_string())?;
}
word(&mut self.s, "fn")
}
pub fn print_unsafety(&mut self, s: ast::Unsafety) -> io::Result<()> {
match s {
ast::Unsafety::Normal => Ok(()),
ast::Unsafety::Unsafe => self.word_nbsp("unsafe"),
}
}
}
fn repeat(s: &str, n: usize) -> String {
iter::repeat(s).take(n).collect()
}
#[cfg(test)]
mod tests {
use super::*;
use crate::ast;
use crate::codemap;
use crate::syntax_pos;
#[test]
fn test_fun_to_string() {
let abba_ident = ast::Ident::from_str("abba");
let decl = ast::FnDecl {
inputs: Vec::new(),
output: ast::FunctionRetTy::Default(syntax_pos::DUMMY_SP),
variadic: false,
};
let generics = ast::Generics::default();
assert_eq!(
fun_to_string(
&decl,
ast::Unsafety::Normal,
ast::Constness::NotConst,
abba_ident,
&generics
),
"fn abba()"
);
}
#[test]
fn test_variant_to_string() {
let ident = ast::Ident::from_str("principal_skinner");
let var = codemap::respan(
syntax_pos::DUMMY_SP,
ast::Variant_ {
name: ident,
attrs: Vec::new(),
data: ast::VariantData::Unit(ast::DUMMY_NODE_ID),
disr_expr: None,
},
);
let varstr = variant_to_string(&var);
assert_eq!(varstr, "principal_skinner");
}
}