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New upstream version 1.48.0~beta.8+dfsg1
[rustc.git] / compiler / rustc_ast_pretty / src / pprust.rs
1 use crate::pp::Breaks::{Consistent, Inconsistent};
2 use crate::pp::{self, Breaks};
3
4 use rustc_ast::attr;
5 use rustc_ast::ptr::P;
6 use rustc_ast::token::{self, BinOpToken, CommentKind, DelimToken, Nonterminal, Token, TokenKind};
7 use rustc_ast::tokenstream::{TokenStream, TokenTree};
8 use rustc_ast::util::classify;
9 use rustc_ast::util::comments::{gather_comments, Comment, CommentStyle};
10 use rustc_ast::util::parser::{self, AssocOp, Fixity};
11 use rustc_ast::{self as ast, BlockCheckMode, PatKind, RangeEnd, RangeSyntax};
12 use rustc_ast::{GenericArg, MacArgs};
13 use rustc_ast::{GenericBound, SelfKind, TraitBoundModifier};
14 use rustc_ast::{InlineAsmOperand, InlineAsmRegOrRegClass};
15 use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
16 use rustc_span::edition::Edition;
17 use rustc_span::source_map::{SourceMap, Spanned};
18 use rustc_span::symbol::{kw, sym, Ident, IdentPrinter, Symbol};
19 use rustc_span::{BytePos, FileName, Span};
20
21 use std::borrow::Cow;
22
23 #[cfg(test)]
24 mod tests;
25
26 pub enum MacHeader<'a> {
27 Path(&'a ast::Path),
28 Keyword(&'static str),
29 }
30
31 pub enum AnnNode<'a> {
32 Ident(&'a Ident),
33 Name(&'a Symbol),
34 Block(&'a ast::Block),
35 Item(&'a ast::Item),
36 SubItem(ast::NodeId),
37 Expr(&'a ast::Expr),
38 Pat(&'a ast::Pat),
39 Crate(&'a ast::Crate),
40 }
41
42 pub trait PpAnn {
43 fn pre(&self, _state: &mut State<'_>, _node: AnnNode<'_>) {}
44 fn post(&self, _state: &mut State<'_>, _node: AnnNode<'_>) {}
45 }
46
47 #[derive(Copy, Clone)]
48 pub struct NoAnn;
49
50 impl PpAnn for NoAnn {}
51
52 pub struct Comments<'a> {
53 sm: &'a SourceMap,
54 comments: Vec<Comment>,
55 current: usize,
56 }
57
58 impl<'a> Comments<'a> {
59 pub fn new(sm: &'a SourceMap, filename: FileName, input: String) -> Comments<'a> {
60 let comments = gather_comments(sm, filename, input);
61 Comments { sm, comments, current: 0 }
62 }
63
64 pub fn next(&self) -> Option<Comment> {
65 self.comments.get(self.current).cloned()
66 }
67
68 pub fn trailing_comment(
69 &mut self,
70 span: rustc_span::Span,
71 next_pos: Option<BytePos>,
72 ) -> Option<Comment> {
73 if let Some(cmnt) = self.next() {
74 if cmnt.style != CommentStyle::Trailing {
75 return None;
76 }
77 let span_line = self.sm.lookup_char_pos(span.hi());
78 let comment_line = self.sm.lookup_char_pos(cmnt.pos);
79 let next = next_pos.unwrap_or_else(|| cmnt.pos + BytePos(1));
80 if span.hi() < cmnt.pos && cmnt.pos < next && span_line.line == comment_line.line {
81 return Some(cmnt);
82 }
83 }
84
85 None
86 }
87 }
88
89 pub struct State<'a> {
90 pub s: pp::Printer,
91 comments: Option<Comments<'a>>,
92 ann: &'a (dyn PpAnn + 'a),
93 is_expanded: bool,
94 }
95
96 crate const INDENT_UNIT: usize = 4;
97
98 /// Requires you to pass an input filename and reader so that
99 /// it can scan the input text for comments to copy forward.
100 pub fn print_crate<'a>(
101 sm: &'a SourceMap,
102 krate: &ast::Crate,
103 filename: FileName,
104 input: String,
105 ann: &'a dyn PpAnn,
106 is_expanded: bool,
107 edition: Edition,
108 has_injected_crate: bool,
109 ) -> String {
110 let mut s = State {
111 s: pp::mk_printer(),
112 comments: Some(Comments::new(sm, filename, input)),
113 ann,
114 is_expanded,
115 };
116
117 if is_expanded && has_injected_crate {
118 // We need to print `#![no_std]` (and its feature gate) so that
119 // compiling pretty-printed source won't inject libstd again.
120 // However, we don't want these attributes in the AST because
121 // of the feature gate, so we fake them up here.
122
123 // `#![feature(prelude_import)]`
124 let pi_nested = attr::mk_nested_word_item(Ident::with_dummy_span(sym::prelude_import));
125 let list = attr::mk_list_item(Ident::with_dummy_span(sym::feature), vec![pi_nested]);
126 let fake_attr = attr::mk_attr_inner(list);
127 s.print_attribute(&fake_attr);
128
129 // Currently, in Rust 2018 we don't have `extern crate std;` at the crate
130 // root, so this is not needed, and actually breaks things.
131 if edition == Edition::Edition2015 {
132 // `#![no_std]`
133 let no_std_meta = attr::mk_word_item(Ident::with_dummy_span(sym::no_std));
134 let fake_attr = attr::mk_attr_inner(no_std_meta);
135 s.print_attribute(&fake_attr);
136 }
137 }
138
139 s.print_mod(&krate.module, &krate.attrs);
140 s.print_remaining_comments();
141 s.ann.post(&mut s, AnnNode::Crate(krate));
142 s.s.eof()
143 }
144
145 pub fn to_string(f: impl FnOnce(&mut State<'_>)) -> String {
146 let mut printer =
147 State { s: pp::mk_printer(), comments: None, ann: &NoAnn, is_expanded: false };
148 f(&mut printer);
149 printer.s.eof()
150 }
151
152 // This makes printed token streams look slightly nicer,
153 // and also addresses some specific regressions described in #63896 and #73345.
154 fn tt_prepend_space(tt: &TokenTree, prev: &TokenTree) -> bool {
155 if let TokenTree::Token(token) = prev {
156 if let token::DocComment(comment_kind, ..) = token.kind {
157 return comment_kind != CommentKind::Line;
158 }
159 }
160 match tt {
161 TokenTree::Token(token) => match token.kind {
162 token::Comma => false,
163 _ => true,
164 },
165 TokenTree::Delimited(_, DelimToken::Paren, _) => match prev {
166 TokenTree::Token(token) => match token.kind {
167 token::Ident(_, _) => false,
168 _ => true,
169 },
170 _ => true,
171 },
172 TokenTree::Delimited(_, DelimToken::Bracket, _) => match prev {
173 TokenTree::Token(token) => match token.kind {
174 token::Pound => false,
175 _ => true,
176 },
177 _ => true,
178 },
179 TokenTree::Delimited(..) => true,
180 }
181 }
182
183 fn binop_to_string(op: BinOpToken) -> &'static str {
184 match op {
185 token::Plus => "+",
186 token::Minus => "-",
187 token::Star => "*",
188 token::Slash => "/",
189 token::Percent => "%",
190 token::Caret => "^",
191 token::And => "&",
192 token::Or => "|",
193 token::Shl => "<<",
194 token::Shr => ">>",
195 }
196 }
197
198 fn doc_comment_to_string(
199 comment_kind: CommentKind,
200 attr_style: ast::AttrStyle,
201 data: Symbol,
202 ) -> String {
203 match (comment_kind, attr_style) {
204 (CommentKind::Line, ast::AttrStyle::Outer) => format!("///{}", data),
205 (CommentKind::Line, ast::AttrStyle::Inner) => format!("//!{}", data),
206 (CommentKind::Block, ast::AttrStyle::Outer) => format!("/**{}*/", data),
207 (CommentKind::Block, ast::AttrStyle::Inner) => format!("/*!{}*/", data),
208 }
209 }
210
211 pub fn literal_to_string(lit: token::Lit) -> String {
212 let token::Lit { kind, symbol, suffix } = lit;
213 let mut out = match kind {
214 token::Byte => format!("b'{}'", symbol),
215 token::Char => format!("'{}'", symbol),
216 token::Str => format!("\"{}\"", symbol),
217 token::StrRaw(n) => {
218 format!("r{delim}\"{string}\"{delim}", delim = "#".repeat(n as usize), string = symbol)
219 }
220 token::ByteStr => format!("b\"{}\"", symbol),
221 token::ByteStrRaw(n) => {
222 format!("br{delim}\"{string}\"{delim}", delim = "#".repeat(n as usize), string = symbol)
223 }
224 token::Integer | token::Float | token::Bool | token::Err => symbol.to_string(),
225 };
226
227 if let Some(suffix) = suffix {
228 out.push_str(&suffix.as_str())
229 }
230
231 out
232 }
233
234 /// Print the token kind precisely, without converting `$crate` into its respective crate name.
235 pub fn token_kind_to_string(tok: &TokenKind) -> String {
236 token_kind_to_string_ext(tok, None)
237 }
238
239 fn token_kind_to_string_ext(tok: &TokenKind, convert_dollar_crate: Option<Span>) -> String {
240 match *tok {
241 token::Eq => "=".to_string(),
242 token::Lt => "<".to_string(),
243 token::Le => "<=".to_string(),
244 token::EqEq => "==".to_string(),
245 token::Ne => "!=".to_string(),
246 token::Ge => ">=".to_string(),
247 token::Gt => ">".to_string(),
248 token::Not => "!".to_string(),
249 token::Tilde => "~".to_string(),
250 token::OrOr => "||".to_string(),
251 token::AndAnd => "&&".to_string(),
252 token::BinOp(op) => binop_to_string(op).to_string(),
253 token::BinOpEq(op) => format!("{}=", binop_to_string(op)),
254
255 /* Structural symbols */
256 token::At => "@".to_string(),
257 token::Dot => ".".to_string(),
258 token::DotDot => "..".to_string(),
259 token::DotDotDot => "...".to_string(),
260 token::DotDotEq => "..=".to_string(),
261 token::Comma => ",".to_string(),
262 token::Semi => ";".to_string(),
263 token::Colon => ":".to_string(),
264 token::ModSep => "::".to_string(),
265 token::RArrow => "->".to_string(),
266 token::LArrow => "<-".to_string(),
267 token::FatArrow => "=>".to_string(),
268 token::OpenDelim(token::Paren) => "(".to_string(),
269 token::CloseDelim(token::Paren) => ")".to_string(),
270 token::OpenDelim(token::Bracket) => "[".to_string(),
271 token::CloseDelim(token::Bracket) => "]".to_string(),
272 token::OpenDelim(token::Brace) => "{".to_string(),
273 token::CloseDelim(token::Brace) => "}".to_string(),
274 token::OpenDelim(token::NoDelim) | token::CloseDelim(token::NoDelim) => "".to_string(),
275 token::Pound => "#".to_string(),
276 token::Dollar => "$".to_string(),
277 token::Question => "?".to_string(),
278 token::SingleQuote => "'".to_string(),
279
280 /* Literals */
281 token::Literal(lit) => literal_to_string(lit),
282
283 /* Name components */
284 token::Ident(s, is_raw) => IdentPrinter::new(s, is_raw, convert_dollar_crate).to_string(),
285 token::Lifetime(s) => s.to_string(),
286
287 /* Other */
288 token::DocComment(comment_kind, attr_style, data) => {
289 doc_comment_to_string(comment_kind, attr_style, data)
290 }
291 token::Eof => "<eof>".to_string(),
292
293 token::Interpolated(ref nt) => nonterminal_to_string(nt),
294 }
295 }
296
297 /// Print the token precisely, without converting `$crate` into its respective crate name.
298 pub fn token_to_string(token: &Token) -> String {
299 token_to_string_ext(token, false)
300 }
301
302 fn token_to_string_ext(token: &Token, convert_dollar_crate: bool) -> String {
303 let convert_dollar_crate = convert_dollar_crate.then_some(token.span);
304 token_kind_to_string_ext(&token.kind, convert_dollar_crate)
305 }
306
307 pub fn nonterminal_to_string(nt: &Nonterminal) -> String {
308 match *nt {
309 token::NtExpr(ref e) => expr_to_string(e),
310 token::NtMeta(ref e) => attr_item_to_string(e),
311 token::NtTy(ref e) => ty_to_string(e),
312 token::NtPath(ref e) => path_to_string(e),
313 token::NtItem(ref e) => item_to_string(e),
314 token::NtBlock(ref e) => block_to_string(e),
315 token::NtStmt(ref e) => stmt_to_string(e),
316 token::NtPat(ref e) => pat_to_string(e),
317 token::NtIdent(e, is_raw) => IdentPrinter::for_ast_ident(e, is_raw).to_string(),
318 token::NtLifetime(e) => e.to_string(),
319 token::NtLiteral(ref e) => expr_to_string(e),
320 token::NtTT(ref tree) => tt_to_string(tree),
321 token::NtVis(ref e) => vis_to_string(e),
322 }
323 }
324
325 pub fn ty_to_string(ty: &ast::Ty) -> String {
326 to_string(|s| s.print_type(ty))
327 }
328
329 pub fn bounds_to_string(bounds: &[ast::GenericBound]) -> String {
330 to_string(|s| s.print_type_bounds("", bounds))
331 }
332
333 pub fn pat_to_string(pat: &ast::Pat) -> String {
334 to_string(|s| s.print_pat(pat))
335 }
336
337 pub fn expr_to_string(e: &ast::Expr) -> String {
338 to_string(|s| s.print_expr(e))
339 }
340
341 pub fn tt_to_string(tt: &TokenTree) -> String {
342 to_string(|s| s.print_tt(tt, false))
343 }
344
345 pub fn tts_to_string(tokens: &TokenStream) -> String {
346 to_string(|s| s.print_tts(tokens, false))
347 }
348
349 pub fn stmt_to_string(stmt: &ast::Stmt) -> String {
350 to_string(|s| s.print_stmt(stmt))
351 }
352
353 pub fn item_to_string(i: &ast::Item) -> String {
354 to_string(|s| s.print_item(i))
355 }
356
357 pub fn generic_params_to_string(generic_params: &[ast::GenericParam]) -> String {
358 to_string(|s| s.print_generic_params(generic_params))
359 }
360
361 pub fn path_to_string(p: &ast::Path) -> String {
362 to_string(|s| s.print_path(p, false, 0))
363 }
364
365 pub fn path_segment_to_string(p: &ast::PathSegment) -> String {
366 to_string(|s| s.print_path_segment(p, false))
367 }
368
369 pub fn vis_to_string(v: &ast::Visibility) -> String {
370 to_string(|s| s.print_visibility(v))
371 }
372
373 fn block_to_string(blk: &ast::Block) -> String {
374 to_string(|s| {
375 // Containing cbox, will be closed by `print_block` at `}`.
376 s.cbox(INDENT_UNIT);
377 // Head-ibox, will be closed by `print_block` after `{`.
378 s.ibox(0);
379 s.print_block(blk)
380 })
381 }
382
383 pub fn meta_list_item_to_string(li: &ast::NestedMetaItem) -> String {
384 to_string(|s| s.print_meta_list_item(li))
385 }
386
387 fn attr_item_to_string(ai: &ast::AttrItem) -> String {
388 to_string(|s| s.print_attr_item(ai, ai.path.span))
389 }
390
391 pub fn attribute_to_string(attr: &ast::Attribute) -> String {
392 to_string(|s| s.print_attribute(attr))
393 }
394
395 pub fn param_to_string(arg: &ast::Param) -> String {
396 to_string(|s| s.print_param(arg, false))
397 }
398
399 fn visibility_qualified(vis: &ast::Visibility, s: &str) -> String {
400 format!("{}{}", to_string(|s| s.print_visibility(vis)), s)
401 }
402
403 impl std::ops::Deref for State<'_> {
404 type Target = pp::Printer;
405 fn deref(&self) -> &Self::Target {
406 &self.s
407 }
408 }
409
410 impl std::ops::DerefMut for State<'_> {
411 fn deref_mut(&mut self) -> &mut Self::Target {
412 &mut self.s
413 }
414 }
415
416 pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::DerefMut {
417 fn comments(&mut self) -> &mut Option<Comments<'a>>;
418 fn print_ident(&mut self, ident: Ident);
419 fn print_generic_args(&mut self, args: &ast::GenericArgs, colons_before_params: bool);
420
421 fn strsep<T, F>(
422 &mut self,
423 sep: &'static str,
424 space_before: bool,
425 b: Breaks,
426 elts: &[T],
427 mut op: F,
428 ) where
429 F: FnMut(&mut Self, &T),
430 {
431 self.rbox(0, b);
432 if let Some((first, rest)) = elts.split_first() {
433 op(self, first);
434 for elt in rest {
435 if space_before {
436 self.space();
437 }
438 self.word_space(sep);
439 op(self, elt);
440 }
441 }
442 self.end();
443 }
444
445 fn commasep<T, F>(&mut self, b: Breaks, elts: &[T], op: F)
446 where
447 F: FnMut(&mut Self, &T),
448 {
449 self.strsep(",", false, b, elts, op)
450 }
451
452 fn maybe_print_comment(&mut self, pos: BytePos) {
453 while let Some(ref cmnt) = self.next_comment() {
454 if cmnt.pos < pos {
455 self.print_comment(cmnt);
456 } else {
457 break;
458 }
459 }
460 }
461
462 fn print_comment(&mut self, cmnt: &Comment) {
463 match cmnt.style {
464 CommentStyle::Mixed => {
465 if !self.is_beginning_of_line() {
466 self.zerobreak();
467 }
468 if let Some((last, lines)) = cmnt.lines.split_last() {
469 self.ibox(0);
470
471 for line in lines {
472 self.word(line.clone());
473 self.hardbreak()
474 }
475
476 self.word(last.clone());
477 self.space();
478
479 self.end();
480 }
481 self.zerobreak()
482 }
483 CommentStyle::Isolated => {
484 self.hardbreak_if_not_bol();
485 for line in &cmnt.lines {
486 // Don't print empty lines because they will end up as trailing
487 // whitespace.
488 if !line.is_empty() {
489 self.word(line.clone());
490 }
491 self.hardbreak();
492 }
493 }
494 CommentStyle::Trailing => {
495 if !self.is_beginning_of_line() {
496 self.word(" ");
497 }
498 if cmnt.lines.len() == 1 {
499 self.word(cmnt.lines[0].clone());
500 self.hardbreak()
501 } else {
502 self.ibox(0);
503 for line in &cmnt.lines {
504 if !line.is_empty() {
505 self.word(line.clone());
506 }
507 self.hardbreak();
508 }
509 self.end();
510 }
511 }
512 CommentStyle::BlankLine => {
513 // We need to do at least one, possibly two hardbreaks.
514 let twice = match self.last_token() {
515 pp::Token::String(s) => ";" == s,
516 pp::Token::Begin(_) => true,
517 pp::Token::End => true,
518 _ => false,
519 };
520 if twice {
521 self.hardbreak();
522 }
523 self.hardbreak();
524 }
525 }
526 if let Some(cmnts) = self.comments() {
527 cmnts.current += 1;
528 }
529 }
530
531 fn next_comment(&mut self) -> Option<Comment> {
532 self.comments().as_mut().and_then(|c| c.next())
533 }
534
535 fn print_literal(&mut self, lit: &ast::Lit) {
536 self.maybe_print_comment(lit.span.lo());
537 self.word(lit.token.to_string())
538 }
539
540 fn print_string(&mut self, st: &str, style: ast::StrStyle) {
541 let st = match style {
542 ast::StrStyle::Cooked => (format!("\"{}\"", st.escape_debug())),
543 ast::StrStyle::Raw(n) => {
544 format!("r{delim}\"{string}\"{delim}", delim = "#".repeat(n as usize), string = st)
545 }
546 };
547 self.word(st)
548 }
549
550 fn print_symbol(&mut self, sym: Symbol, style: ast::StrStyle) {
551 self.print_string(&sym.as_str(), style);
552 }
553
554 fn print_inner_attributes(&mut self, attrs: &[ast::Attribute]) {
555 self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, true)
556 }
557
558 fn print_inner_attributes_no_trailing_hardbreak(&mut self, attrs: &[ast::Attribute]) {
559 self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, false)
560 }
561
562 fn print_outer_attributes(&mut self, attrs: &[ast::Attribute]) {
563 self.print_either_attributes(attrs, ast::AttrStyle::Outer, false, true)
564 }
565
566 fn print_inner_attributes_inline(&mut self, attrs: &[ast::Attribute]) {
567 self.print_either_attributes(attrs, ast::AttrStyle::Inner, true, true)
568 }
569
570 fn print_outer_attributes_inline(&mut self, attrs: &[ast::Attribute]) {
571 self.print_either_attributes(attrs, ast::AttrStyle::Outer, true, true)
572 }
573
574 fn print_either_attributes(
575 &mut self,
576 attrs: &[ast::Attribute],
577 kind: ast::AttrStyle,
578 is_inline: bool,
579 trailing_hardbreak: bool,
580 ) {
581 let mut count = 0;
582 for attr in attrs {
583 if attr.style == kind {
584 self.print_attribute_inline(attr, is_inline);
585 if is_inline {
586 self.nbsp();
587 }
588 count += 1;
589 }
590 }
591 if count > 0 && trailing_hardbreak && !is_inline {
592 self.hardbreak_if_not_bol();
593 }
594 }
595
596 fn print_attribute(&mut self, attr: &ast::Attribute) {
597 self.print_attribute_inline(attr, false)
598 }
599
600 fn print_attribute_inline(&mut self, attr: &ast::Attribute, is_inline: bool) {
601 if !is_inline {
602 self.hardbreak_if_not_bol();
603 }
604 self.maybe_print_comment(attr.span.lo());
605 match attr.kind {
606 ast::AttrKind::Normal(ref item) => {
607 match attr.style {
608 ast::AttrStyle::Inner => self.word("#!["),
609 ast::AttrStyle::Outer => self.word("#["),
610 }
611 self.print_attr_item(&item, attr.span);
612 self.word("]");
613 }
614 ast::AttrKind::DocComment(comment_kind, data) => {
615 self.word(doc_comment_to_string(comment_kind, attr.style, data));
616 self.hardbreak()
617 }
618 }
619 }
620
621 fn print_attr_item(&mut self, item: &ast::AttrItem, span: Span) {
622 self.ibox(0);
623 match &item.args {
624 MacArgs::Delimited(_, delim, tokens) => self.print_mac_common(
625 Some(MacHeader::Path(&item.path)),
626 false,
627 None,
628 delim.to_token(),
629 tokens,
630 true,
631 span,
632 ),
633 MacArgs::Empty | MacArgs::Eq(..) => {
634 self.print_path(&item.path, false, 0);
635 if let MacArgs::Eq(_, tokens) = &item.args {
636 self.space();
637 self.word_space("=");
638 self.print_tts(tokens, true);
639 }
640 }
641 }
642 self.end();
643 }
644
645 fn print_meta_list_item(&mut self, item: &ast::NestedMetaItem) {
646 match item {
647 ast::NestedMetaItem::MetaItem(ref mi) => self.print_meta_item(mi),
648 ast::NestedMetaItem::Literal(ref lit) => self.print_literal(lit),
649 }
650 }
651
652 fn print_meta_item(&mut self, item: &ast::MetaItem) {
653 self.ibox(INDENT_UNIT);
654 match item.kind {
655 ast::MetaItemKind::Word => self.print_path(&item.path, false, 0),
656 ast::MetaItemKind::NameValue(ref value) => {
657 self.print_path(&item.path, false, 0);
658 self.space();
659 self.word_space("=");
660 self.print_literal(value);
661 }
662 ast::MetaItemKind::List(ref items) => {
663 self.print_path(&item.path, false, 0);
664 self.popen();
665 self.commasep(Consistent, &items[..], |s, i| s.print_meta_list_item(i));
666 self.pclose();
667 }
668 }
669 self.end();
670 }
671
672 /// This doesn't deserve to be called "pretty" printing, but it should be
673 /// meaning-preserving. A quick hack that might help would be to look at the
674 /// spans embedded in the TTs to decide where to put spaces and newlines.
675 /// But it'd be better to parse these according to the grammar of the
676 /// appropriate macro, transcribe back into the grammar we just parsed from,
677 /// and then pretty-print the resulting AST nodes (so, e.g., we print
678 /// expression arguments as expressions). It can be done! I think.
679 fn print_tt(&mut self, tt: &TokenTree, convert_dollar_crate: bool) {
680 match tt {
681 TokenTree::Token(token) => {
682 self.word(token_to_string_ext(&token, convert_dollar_crate));
683 if let token::DocComment(..) = token.kind {
684 self.hardbreak()
685 }
686 }
687 TokenTree::Delimited(dspan, delim, tts) => {
688 self.print_mac_common(
689 None,
690 false,
691 None,
692 *delim,
693 tts,
694 convert_dollar_crate,
695 dspan.entire(),
696 );
697 }
698 }
699 }
700
701 fn print_tts(&mut self, tts: &TokenStream, convert_dollar_crate: bool) {
702 let mut iter = tts.trees().peekable();
703 while let Some(tt) = iter.next() {
704 self.print_tt(&tt, convert_dollar_crate);
705 if let Some(next) = iter.peek() {
706 if tt_prepend_space(next, &tt) {
707 self.space();
708 }
709 }
710 }
711 }
712
713 fn print_mac_common(
714 &mut self,
715 header: Option<MacHeader<'_>>,
716 has_bang: bool,
717 ident: Option<Ident>,
718 delim: DelimToken,
719 tts: &TokenStream,
720 convert_dollar_crate: bool,
721 span: Span,
722 ) {
723 if delim == DelimToken::Brace {
724 self.cbox(INDENT_UNIT);
725 }
726 match header {
727 Some(MacHeader::Path(path)) => self.print_path(path, false, 0),
728 Some(MacHeader::Keyword(kw)) => self.word(kw),
729 None => {}
730 }
731 if has_bang {
732 self.word("!");
733 }
734 if let Some(ident) = ident {
735 self.nbsp();
736 self.print_ident(ident);
737 }
738 match delim {
739 DelimToken::Brace => {
740 if header.is_some() || has_bang || ident.is_some() {
741 self.nbsp();
742 }
743 self.word("{");
744 if !tts.is_empty() {
745 self.space();
746 }
747 }
748 _ => self.word(token_kind_to_string(&token::OpenDelim(delim))),
749 }
750 self.ibox(0);
751 self.print_tts(tts, convert_dollar_crate);
752 self.end();
753 match delim {
754 DelimToken::Brace => self.bclose(span),
755 _ => self.word(token_kind_to_string(&token::CloseDelim(delim))),
756 }
757 }
758
759 fn print_path(&mut self, path: &ast::Path, colons_before_params: bool, depth: usize) {
760 self.maybe_print_comment(path.span.lo());
761
762 for (i, segment) in path.segments[..path.segments.len() - depth].iter().enumerate() {
763 if i > 0 {
764 self.word("::")
765 }
766 self.print_path_segment(segment, colons_before_params);
767 }
768 }
769
770 fn print_path_segment(&mut self, segment: &ast::PathSegment, colons_before_params: bool) {
771 if segment.ident.name != kw::PathRoot {
772 self.print_ident(segment.ident);
773 if let Some(ref args) = segment.args {
774 self.print_generic_args(args, colons_before_params);
775 }
776 }
777 }
778
779 fn head<S: Into<Cow<'static, str>>>(&mut self, w: S) {
780 let w = w.into();
781 // Outer-box is consistent.
782 self.cbox(INDENT_UNIT);
783 // Head-box is inconsistent.
784 self.ibox(w.len() + 1);
785 // Keyword that starts the head.
786 if !w.is_empty() {
787 self.word_nbsp(w);
788 }
789 }
790
791 fn bopen(&mut self) {
792 self.word("{");
793 self.end(); // Close the head-box.
794 }
795
796 fn bclose_maybe_open(&mut self, span: rustc_span::Span, close_box: bool) {
797 self.maybe_print_comment(span.hi());
798 self.break_offset_if_not_bol(1, -(INDENT_UNIT as isize));
799 self.word("}");
800 if close_box {
801 self.end(); // Close the outer-box.
802 }
803 }
804
805 fn bclose(&mut self, span: rustc_span::Span) {
806 self.bclose_maybe_open(span, true)
807 }
808
809 fn break_offset_if_not_bol(&mut self, n: usize, off: isize) {
810 if !self.is_beginning_of_line() {
811 self.break_offset(n, off)
812 } else {
813 if off != 0 && self.last_token().is_hardbreak_tok() {
814 // We do something pretty sketchy here: tuck the nonzero
815 // offset-adjustment we were going to deposit along with the
816 // break into the previous hardbreak.
817 self.replace_last_token(pp::Printer::hardbreak_tok_offset(off));
818 }
819 }
820 }
821 }
822
823 impl<'a> PrintState<'a> for State<'a> {
824 fn comments(&mut self) -> &mut Option<Comments<'a>> {
825 &mut self.comments
826 }
827
828 fn print_ident(&mut self, ident: Ident) {
829 self.s.word(IdentPrinter::for_ast_ident(ident, ident.is_raw_guess()).to_string());
830 self.ann.post(self, AnnNode::Ident(&ident))
831 }
832
833 fn print_generic_args(&mut self, args: &ast::GenericArgs, colons_before_params: bool) {
834 if colons_before_params {
835 self.s.word("::")
836 }
837
838 match *args {
839 ast::GenericArgs::AngleBracketed(ref data) => {
840 self.s.word("<");
841 self.commasep(Inconsistent, &data.args, |s, arg| match arg {
842 ast::AngleBracketedArg::Arg(a) => s.print_generic_arg(a),
843 ast::AngleBracketedArg::Constraint(c) => s.print_assoc_constraint(c),
844 });
845 self.s.word(">")
846 }
847
848 ast::GenericArgs::Parenthesized(ref data) => {
849 self.s.word("(");
850 self.commasep(Inconsistent, &data.inputs, |s, ty| s.print_type(ty));
851 self.s.word(")");
852 self.print_fn_ret_ty(&data.output);
853 }
854 }
855 }
856 }
857
858 impl<'a> State<'a> {
859 // Synthesizes a comment that was not textually present in the original source
860 // file.
861 pub fn synth_comment(&mut self, text: String) {
862 self.s.word("/*");
863 self.s.space();
864 self.s.word(text);
865 self.s.space();
866 self.s.word("*/")
867 }
868
869 crate fn commasep_cmnt<T, F, G>(&mut self, b: Breaks, elts: &[T], mut op: F, mut get_span: G)
870 where
871 F: FnMut(&mut State<'_>, &T),
872 G: FnMut(&T) -> rustc_span::Span,
873 {
874 self.rbox(0, b);
875 let len = elts.len();
876 let mut i = 0;
877 for elt in elts {
878 self.maybe_print_comment(get_span(elt).hi());
879 op(self, elt);
880 i += 1;
881 if i < len {
882 self.s.word(",");
883 self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi()));
884 self.space_if_not_bol();
885 }
886 }
887 self.end();
888 }
889
890 crate fn commasep_exprs(&mut self, b: Breaks, exprs: &[P<ast::Expr>]) {
891 self.commasep_cmnt(b, exprs, |s, e| s.print_expr(e), |e| e.span)
892 }
893
894 pub fn print_mod(&mut self, _mod: &ast::Mod, attrs: &[ast::Attribute]) {
895 self.print_inner_attributes(attrs);
896 for item in &_mod.items {
897 self.print_item(item);
898 }
899 }
900
901 crate fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod, attrs: &[ast::Attribute]) {
902 self.print_inner_attributes(attrs);
903 for item in &nmod.items {
904 self.print_foreign_item(item);
905 }
906 }
907
908 pub fn print_opt_lifetime(&mut self, lifetime: &Option<ast::Lifetime>) {
909 if let Some(lt) = *lifetime {
910 self.print_lifetime(lt);
911 self.nbsp();
912 }
913 }
914
915 pub fn print_assoc_constraint(&mut self, constraint: &ast::AssocTyConstraint) {
916 self.print_ident(constraint.ident);
917 self.s.space();
918 match &constraint.kind {
919 ast::AssocTyConstraintKind::Equality { ty } => {
920 self.word_space("=");
921 self.print_type(ty);
922 }
923 ast::AssocTyConstraintKind::Bound { bounds } => {
924 self.print_type_bounds(":", &*bounds);
925 }
926 }
927 }
928
929 pub fn print_generic_arg(&mut self, generic_arg: &GenericArg) {
930 match generic_arg {
931 GenericArg::Lifetime(lt) => self.print_lifetime(*lt),
932 GenericArg::Type(ty) => self.print_type(ty),
933 GenericArg::Const(ct) => self.print_expr(&ct.value),
934 }
935 }
936
937 pub fn print_type(&mut self, ty: &ast::Ty) {
938 self.maybe_print_comment(ty.span.lo());
939 self.ibox(0);
940 match ty.kind {
941 ast::TyKind::Slice(ref ty) => {
942 self.s.word("[");
943 self.print_type(ty);
944 self.s.word("]");
945 }
946 ast::TyKind::Ptr(ref mt) => {
947 self.s.word("*");
948 self.print_mt(mt, true);
949 }
950 ast::TyKind::Rptr(ref lifetime, ref mt) => {
951 self.s.word("&");
952 self.print_opt_lifetime(lifetime);
953 self.print_mt(mt, false);
954 }
955 ast::TyKind::Never => {
956 self.s.word("!");
957 }
958 ast::TyKind::Tup(ref elts) => {
959 self.popen();
960 self.commasep(Inconsistent, &elts[..], |s, ty| s.print_type(ty));
961 if elts.len() == 1 {
962 self.s.word(",");
963 }
964 self.pclose();
965 }
966 ast::TyKind::Paren(ref typ) => {
967 self.popen();
968 self.print_type(typ);
969 self.pclose();
970 }
971 ast::TyKind::BareFn(ref f) => {
972 self.print_ty_fn(f.ext, f.unsafety, &f.decl, None, &f.generic_params);
973 }
974 ast::TyKind::Path(None, ref path) => {
975 self.print_path(path, false, 0);
976 }
977 ast::TyKind::Path(Some(ref qself), ref path) => self.print_qpath(path, qself, false),
978 ast::TyKind::TraitObject(ref bounds, syntax) => {
979 let prefix = if syntax == ast::TraitObjectSyntax::Dyn { "dyn" } else { "" };
980 self.print_type_bounds(prefix, &bounds[..]);
981 }
982 ast::TyKind::ImplTrait(_, ref bounds) => {
983 self.print_type_bounds("impl", &bounds[..]);
984 }
985 ast::TyKind::Array(ref ty, ref length) => {
986 self.s.word("[");
987 self.print_type(ty);
988 self.s.word("; ");
989 self.print_expr(&length.value);
990 self.s.word("]");
991 }
992 ast::TyKind::Typeof(ref e) => {
993 self.s.word("typeof(");
994 self.print_expr(&e.value);
995 self.s.word(")");
996 }
997 ast::TyKind::Infer => {
998 self.s.word("_");
999 }
1000 ast::TyKind::Err => {
1001 self.popen();
1002 self.s.word("/*ERROR*/");
1003 self.pclose();
1004 }
1005 ast::TyKind::ImplicitSelf => {
1006 self.s.word("Self");
1007 }
1008 ast::TyKind::MacCall(ref m) => {
1009 self.print_mac(m);
1010 }
1011 ast::TyKind::CVarArgs => {
1012 self.s.word("...");
1013 }
1014 }
1015 self.end();
1016 }
1017
1018 crate fn print_foreign_item(&mut self, item: &ast::ForeignItem) {
1019 let ast::Item { id, span, ident, ref attrs, ref kind, ref vis, tokens: _ } = *item;
1020 self.ann.pre(self, AnnNode::SubItem(id));
1021 self.hardbreak_if_not_bol();
1022 self.maybe_print_comment(span.lo());
1023 self.print_outer_attributes(attrs);
1024 match kind {
1025 ast::ForeignItemKind::Fn(def, sig, gen, body) => {
1026 self.print_fn_full(sig, ident, gen, vis, *def, body.as_deref(), attrs);
1027 }
1028 ast::ForeignItemKind::Static(ty, mutbl, body) => {
1029 let def = ast::Defaultness::Final;
1030 self.print_item_const(ident, Some(*mutbl), ty, body.as_deref(), vis, def);
1031 }
1032 ast::ForeignItemKind::TyAlias(def, generics, bounds, ty) => {
1033 self.print_associated_type(ident, generics, bounds, ty.as_deref(), vis, *def);
1034 }
1035 ast::ForeignItemKind::MacCall(m) => {
1036 self.print_mac(m);
1037 if m.args.need_semicolon() {
1038 self.s.word(";");
1039 }
1040 }
1041 }
1042 self.ann.post(self, AnnNode::SubItem(id))
1043 }
1044
1045 fn print_item_const(
1046 &mut self,
1047 ident: Ident,
1048 mutbl: Option<ast::Mutability>,
1049 ty: &ast::Ty,
1050 body: Option<&ast::Expr>,
1051 vis: &ast::Visibility,
1052 defaultness: ast::Defaultness,
1053 ) {
1054 self.head("");
1055 self.print_visibility(vis);
1056 self.print_defaultness(defaultness);
1057 let leading = match mutbl {
1058 None => "const",
1059 Some(ast::Mutability::Not) => "static",
1060 Some(ast::Mutability::Mut) => "static mut",
1061 };
1062 self.word_space(leading);
1063 self.print_ident(ident);
1064 self.word_space(":");
1065 self.print_type(ty);
1066 self.s.space();
1067 self.end(); // end the head-ibox
1068 if let Some(body) = body {
1069 self.word_space("=");
1070 self.print_expr(body);
1071 }
1072 self.s.word(";");
1073 self.end(); // end the outer cbox
1074 }
1075
1076 fn print_associated_type(
1077 &mut self,
1078 ident: Ident,
1079 generics: &ast::Generics,
1080 bounds: &ast::GenericBounds,
1081 ty: Option<&ast::Ty>,
1082 vis: &ast::Visibility,
1083 defaultness: ast::Defaultness,
1084 ) {
1085 self.head("");
1086 self.print_visibility(vis);
1087 self.print_defaultness(defaultness);
1088 self.word_space("type");
1089 self.print_ident(ident);
1090 self.print_generic_params(&generics.params);
1091 self.print_type_bounds(":", bounds);
1092 self.print_where_clause(&generics.where_clause);
1093 if let Some(ty) = ty {
1094 self.s.space();
1095 self.word_space("=");
1096 self.print_type(ty);
1097 }
1098 self.s.word(";");
1099 self.end(); // end inner head-block
1100 self.end(); // end outer head-block
1101 }
1102
1103 /// Pretty-prints an item.
1104 crate fn print_item(&mut self, item: &ast::Item) {
1105 self.hardbreak_if_not_bol();
1106 self.maybe_print_comment(item.span.lo());
1107 self.print_outer_attributes(&item.attrs);
1108 self.ann.pre(self, AnnNode::Item(item));
1109 match item.kind {
1110 ast::ItemKind::ExternCrate(orig_name) => {
1111 self.head(visibility_qualified(&item.vis, "extern crate"));
1112 if let Some(orig_name) = orig_name {
1113 self.print_name(orig_name);
1114 self.s.space();
1115 self.s.word("as");
1116 self.s.space();
1117 }
1118 self.print_ident(item.ident);
1119 self.s.word(";");
1120 self.end(); // end inner head-block
1121 self.end(); // end outer head-block
1122 }
1123 ast::ItemKind::Use(ref tree) => {
1124 self.head(visibility_qualified(&item.vis, "use"));
1125 self.print_use_tree(tree);
1126 self.s.word(";");
1127 self.end(); // end inner head-block
1128 self.end(); // end outer head-block
1129 }
1130 ast::ItemKind::Static(ref ty, mutbl, ref body) => {
1131 let def = ast::Defaultness::Final;
1132 self.print_item_const(item.ident, Some(mutbl), ty, body.as_deref(), &item.vis, def);
1133 }
1134 ast::ItemKind::Const(def, ref ty, ref body) => {
1135 self.print_item_const(item.ident, None, ty, body.as_deref(), &item.vis, def);
1136 }
1137 ast::ItemKind::Fn(def, ref sig, ref gen, ref body) => {
1138 let body = body.as_deref();
1139 self.print_fn_full(sig, item.ident, gen, &item.vis, def, body, &item.attrs);
1140 }
1141 ast::ItemKind::Mod(ref _mod) => {
1142 self.head(to_string(|s| {
1143 s.print_visibility(&item.vis);
1144 s.print_unsafety(_mod.unsafety);
1145 s.word("mod");
1146 }));
1147 self.print_ident(item.ident);
1148
1149 if _mod.inline || self.is_expanded {
1150 self.nbsp();
1151 self.bopen();
1152 self.print_mod(_mod, &item.attrs);
1153 self.bclose(item.span);
1154 } else {
1155 self.s.word(";");
1156 self.end(); // end inner head-block
1157 self.end(); // end outer head-block
1158 }
1159 }
1160 ast::ItemKind::ForeignMod(ref nmod) => {
1161 self.head(to_string(|s| {
1162 s.print_unsafety(nmod.unsafety);
1163 s.word("extern");
1164 }));
1165 if let Some(abi) = nmod.abi {
1166 self.print_literal(&abi.as_lit());
1167 self.nbsp();
1168 }
1169 self.bopen();
1170 self.print_foreign_mod(nmod, &item.attrs);
1171 self.bclose(item.span);
1172 }
1173 ast::ItemKind::GlobalAsm(ref ga) => {
1174 self.head(visibility_qualified(&item.vis, "global_asm!"));
1175 self.s.word(ga.asm.to_string());
1176 self.end();
1177 }
1178 ast::ItemKind::TyAlias(def, ref generics, ref bounds, ref ty) => {
1179 let ty = ty.as_deref();
1180 self.print_associated_type(item.ident, generics, bounds, ty, &item.vis, def);
1181 }
1182 ast::ItemKind::Enum(ref enum_definition, ref params) => {
1183 self.print_enum_def(enum_definition, params, item.ident, item.span, &item.vis);
1184 }
1185 ast::ItemKind::Struct(ref struct_def, ref generics) => {
1186 self.head(visibility_qualified(&item.vis, "struct"));
1187 self.print_struct(struct_def, generics, item.ident, item.span, true);
1188 }
1189 ast::ItemKind::Union(ref struct_def, ref generics) => {
1190 self.head(visibility_qualified(&item.vis, "union"));
1191 self.print_struct(struct_def, generics, item.ident, item.span, true);
1192 }
1193 ast::ItemKind::Impl {
1194 unsafety,
1195 polarity,
1196 defaultness,
1197 constness,
1198 ref generics,
1199 ref of_trait,
1200 ref self_ty,
1201 ref items,
1202 } => {
1203 self.head("");
1204 self.print_visibility(&item.vis);
1205 self.print_defaultness(defaultness);
1206 self.print_unsafety(unsafety);
1207 self.word_nbsp("impl");
1208 self.print_constness(constness);
1209
1210 if !generics.params.is_empty() {
1211 self.print_generic_params(&generics.params);
1212 self.s.space();
1213 }
1214
1215 if let ast::ImplPolarity::Negative(_) = polarity {
1216 self.s.word("!");
1217 }
1218
1219 if let Some(ref t) = *of_trait {
1220 self.print_trait_ref(t);
1221 self.s.space();
1222 self.word_space("for");
1223 }
1224
1225 self.print_type(self_ty);
1226 self.print_where_clause(&generics.where_clause);
1227
1228 self.s.space();
1229 self.bopen();
1230 self.print_inner_attributes(&item.attrs);
1231 for impl_item in items {
1232 self.print_assoc_item(impl_item);
1233 }
1234 self.bclose(item.span);
1235 }
1236 ast::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, ref trait_items) => {
1237 self.head("");
1238 self.print_visibility(&item.vis);
1239 self.print_unsafety(unsafety);
1240 self.print_is_auto(is_auto);
1241 self.word_nbsp("trait");
1242 self.print_ident(item.ident);
1243 self.print_generic_params(&generics.params);
1244 let mut real_bounds = Vec::with_capacity(bounds.len());
1245 for b in bounds.iter() {
1246 if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
1247 self.s.space();
1248 self.word_space("for ?");
1249 self.print_trait_ref(&ptr.trait_ref);
1250 } else {
1251 real_bounds.push(b.clone());
1252 }
1253 }
1254 self.print_type_bounds(":", &real_bounds[..]);
1255 self.print_where_clause(&generics.where_clause);
1256 self.s.word(" ");
1257 self.bopen();
1258 self.print_inner_attributes(&item.attrs);
1259 for trait_item in trait_items {
1260 self.print_assoc_item(trait_item);
1261 }
1262 self.bclose(item.span);
1263 }
1264 ast::ItemKind::TraitAlias(ref generics, ref bounds) => {
1265 self.head("");
1266 self.print_visibility(&item.vis);
1267 self.word_nbsp("trait");
1268 self.print_ident(item.ident);
1269 self.print_generic_params(&generics.params);
1270 let mut real_bounds = Vec::with_capacity(bounds.len());
1271 // FIXME(durka) this seems to be some quite outdated syntax
1272 for b in bounds.iter() {
1273 if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
1274 self.s.space();
1275 self.word_space("for ?");
1276 self.print_trait_ref(&ptr.trait_ref);
1277 } else {
1278 real_bounds.push(b.clone());
1279 }
1280 }
1281 self.nbsp();
1282 self.print_type_bounds("=", &real_bounds[..]);
1283 self.print_where_clause(&generics.where_clause);
1284 self.s.word(";");
1285 }
1286 ast::ItemKind::MacCall(ref mac) => {
1287 self.print_mac(mac);
1288 if mac.args.need_semicolon() {
1289 self.s.word(";");
1290 }
1291 }
1292 ast::ItemKind::MacroDef(ref macro_def) => {
1293 let (kw, has_bang) = if macro_def.macro_rules {
1294 ("macro_rules", true)
1295 } else {
1296 self.print_visibility(&item.vis);
1297 ("macro", false)
1298 };
1299 self.print_mac_common(
1300 Some(MacHeader::Keyword(kw)),
1301 has_bang,
1302 Some(item.ident),
1303 macro_def.body.delim(),
1304 &macro_def.body.inner_tokens(),
1305 true,
1306 item.span,
1307 );
1308 }
1309 }
1310 self.ann.post(self, AnnNode::Item(item))
1311 }
1312
1313 fn print_trait_ref(&mut self, t: &ast::TraitRef) {
1314 self.print_path(&t.path, false, 0)
1315 }
1316
1317 fn print_formal_generic_params(&mut self, generic_params: &[ast::GenericParam]) {
1318 if !generic_params.is_empty() {
1319 self.s.word("for");
1320 self.print_generic_params(generic_params);
1321 self.nbsp();
1322 }
1323 }
1324
1325 fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) {
1326 self.print_formal_generic_params(&t.bound_generic_params);
1327 self.print_trait_ref(&t.trait_ref)
1328 }
1329
1330 crate fn print_enum_def(
1331 &mut self,
1332 enum_definition: &ast::EnumDef,
1333 generics: &ast::Generics,
1334 ident: Ident,
1335 span: rustc_span::Span,
1336 visibility: &ast::Visibility,
1337 ) {
1338 self.head(visibility_qualified(visibility, "enum"));
1339 self.print_ident(ident);
1340 self.print_generic_params(&generics.params);
1341 self.print_where_clause(&generics.where_clause);
1342 self.s.space();
1343 self.print_variants(&enum_definition.variants, span)
1344 }
1345
1346 crate fn print_variants(&mut self, variants: &[ast::Variant], span: rustc_span::Span) {
1347 self.bopen();
1348 for v in variants {
1349 self.space_if_not_bol();
1350 self.maybe_print_comment(v.span.lo());
1351 self.print_outer_attributes(&v.attrs);
1352 self.ibox(INDENT_UNIT);
1353 self.print_variant(v);
1354 self.s.word(",");
1355 self.end();
1356 self.maybe_print_trailing_comment(v.span, None);
1357 }
1358 self.bclose(span)
1359 }
1360
1361 crate fn print_visibility(&mut self, vis: &ast::Visibility) {
1362 match vis.kind {
1363 ast::VisibilityKind::Public => self.word_nbsp("pub"),
1364 ast::VisibilityKind::Crate(sugar) => match sugar {
1365 ast::CrateSugar::PubCrate => self.word_nbsp("pub(crate)"),
1366 ast::CrateSugar::JustCrate => self.word_nbsp("crate"),
1367 },
1368 ast::VisibilityKind::Restricted { ref path, .. } => {
1369 let path = to_string(|s| s.print_path(path, false, 0));
1370 if path == "self" || path == "super" {
1371 self.word_nbsp(format!("pub({})", path))
1372 } else {
1373 self.word_nbsp(format!("pub(in {})", path))
1374 }
1375 }
1376 ast::VisibilityKind::Inherited => {}
1377 }
1378 }
1379
1380 crate fn print_defaultness(&mut self, defaultness: ast::Defaultness) {
1381 if let ast::Defaultness::Default(_) = defaultness {
1382 self.word_nbsp("default");
1383 }
1384 }
1385
1386 crate fn print_struct(
1387 &mut self,
1388 struct_def: &ast::VariantData,
1389 generics: &ast::Generics,
1390 ident: Ident,
1391 span: rustc_span::Span,
1392 print_finalizer: bool,
1393 ) {
1394 self.print_ident(ident);
1395 self.print_generic_params(&generics.params);
1396 match struct_def {
1397 ast::VariantData::Tuple(..) | ast::VariantData::Unit(..) => {
1398 if let ast::VariantData::Tuple(..) = struct_def {
1399 self.popen();
1400 self.commasep(Inconsistent, struct_def.fields(), |s, field| {
1401 s.maybe_print_comment(field.span.lo());
1402 s.print_outer_attributes(&field.attrs);
1403 s.print_visibility(&field.vis);
1404 s.print_type(&field.ty)
1405 });
1406 self.pclose();
1407 }
1408 self.print_where_clause(&generics.where_clause);
1409 if print_finalizer {
1410 self.s.word(";");
1411 }
1412 self.end();
1413 self.end(); // Close the outer-box.
1414 }
1415 ast::VariantData::Struct(..) => {
1416 self.print_where_clause(&generics.where_clause);
1417 self.nbsp();
1418 self.bopen();
1419 self.hardbreak_if_not_bol();
1420
1421 for field in struct_def.fields() {
1422 self.hardbreak_if_not_bol();
1423 self.maybe_print_comment(field.span.lo());
1424 self.print_outer_attributes(&field.attrs);
1425 self.print_visibility(&field.vis);
1426 self.print_ident(field.ident.unwrap());
1427 self.word_nbsp(":");
1428 self.print_type(&field.ty);
1429 self.s.word(",");
1430 }
1431
1432 self.bclose(span)
1433 }
1434 }
1435 }
1436
1437 crate fn print_variant(&mut self, v: &ast::Variant) {
1438 self.head("");
1439 self.print_visibility(&v.vis);
1440 let generics = ast::Generics::default();
1441 self.print_struct(&v.data, &generics, v.ident, v.span, false);
1442 if let Some(ref d) = v.disr_expr {
1443 self.s.space();
1444 self.word_space("=");
1445 self.print_expr(&d.value)
1446 }
1447 }
1448
1449 crate fn print_assoc_item(&mut self, item: &ast::AssocItem) {
1450 let ast::Item { id, span, ident, ref attrs, ref kind, ref vis, tokens: _ } = *item;
1451 self.ann.pre(self, AnnNode::SubItem(id));
1452 self.hardbreak_if_not_bol();
1453 self.maybe_print_comment(span.lo());
1454 self.print_outer_attributes(attrs);
1455 match kind {
1456 ast::AssocItemKind::Fn(def, sig, gen, body) => {
1457 self.print_fn_full(sig, ident, gen, vis, *def, body.as_deref(), attrs);
1458 }
1459 ast::AssocItemKind::Const(def, ty, body) => {
1460 self.print_item_const(ident, None, ty, body.as_deref(), vis, *def);
1461 }
1462 ast::AssocItemKind::TyAlias(def, generics, bounds, ty) => {
1463 self.print_associated_type(ident, generics, bounds, ty.as_deref(), vis, *def);
1464 }
1465 ast::AssocItemKind::MacCall(m) => {
1466 self.print_mac(m);
1467 if m.args.need_semicolon() {
1468 self.s.word(";");
1469 }
1470 }
1471 }
1472 self.ann.post(self, AnnNode::SubItem(id))
1473 }
1474
1475 crate fn print_stmt(&mut self, st: &ast::Stmt) {
1476 self.maybe_print_comment(st.span.lo());
1477 match st.kind {
1478 ast::StmtKind::Local(ref loc) => {
1479 self.print_outer_attributes(&loc.attrs);
1480 self.space_if_not_bol();
1481 self.ibox(INDENT_UNIT);
1482 self.word_nbsp("let");
1483
1484 self.ibox(INDENT_UNIT);
1485 self.print_local_decl(loc);
1486 self.end();
1487 if let Some(ref init) = loc.init {
1488 self.nbsp();
1489 self.word_space("=");
1490 self.print_expr(init);
1491 }
1492 self.s.word(";");
1493 self.end();
1494 }
1495 ast::StmtKind::Item(ref item) => self.print_item(item),
1496 ast::StmtKind::Expr(ref expr) => {
1497 self.space_if_not_bol();
1498 self.print_expr_outer_attr_style(expr, false);
1499 if classify::expr_requires_semi_to_be_stmt(expr) {
1500 self.s.word(";");
1501 }
1502 }
1503 ast::StmtKind::Semi(ref expr) => {
1504 self.space_if_not_bol();
1505 self.print_expr_outer_attr_style(expr, false);
1506 self.s.word(";");
1507 }
1508 ast::StmtKind::Empty => {
1509 self.space_if_not_bol();
1510 self.s.word(";");
1511 }
1512 ast::StmtKind::MacCall(ref mac) => {
1513 self.space_if_not_bol();
1514 self.print_outer_attributes(&mac.attrs);
1515 self.print_mac(&mac.mac);
1516 if mac.style == ast::MacStmtStyle::Semicolon {
1517 self.s.word(";");
1518 }
1519 }
1520 }
1521 self.maybe_print_trailing_comment(st.span, None)
1522 }
1523
1524 crate fn print_block(&mut self, blk: &ast::Block) {
1525 self.print_block_with_attrs(blk, &[])
1526 }
1527
1528 crate fn print_block_unclosed_indent(&mut self, blk: &ast::Block) {
1529 self.print_block_maybe_unclosed(blk, &[], false)
1530 }
1531
1532 crate fn print_block_with_attrs(&mut self, blk: &ast::Block, attrs: &[ast::Attribute]) {
1533 self.print_block_maybe_unclosed(blk, attrs, true)
1534 }
1535
1536 crate fn print_block_maybe_unclosed(
1537 &mut self,
1538 blk: &ast::Block,
1539 attrs: &[ast::Attribute],
1540 close_box: bool,
1541 ) {
1542 match blk.rules {
1543 BlockCheckMode::Unsafe(..) => self.word_space("unsafe"),
1544 BlockCheckMode::Default => (),
1545 }
1546 self.maybe_print_comment(blk.span.lo());
1547 self.ann.pre(self, AnnNode::Block(blk));
1548 self.bopen();
1549
1550 self.print_inner_attributes(attrs);
1551
1552 for (i, st) in blk.stmts.iter().enumerate() {
1553 match st.kind {
1554 ast::StmtKind::Expr(ref expr) if i == blk.stmts.len() - 1 => {
1555 self.maybe_print_comment(st.span.lo());
1556 self.space_if_not_bol();
1557 self.print_expr_outer_attr_style(expr, false);
1558 self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi()));
1559 }
1560 _ => self.print_stmt(st),
1561 }
1562 }
1563
1564 self.bclose_maybe_open(blk.span, close_box);
1565 self.ann.post(self, AnnNode::Block(blk))
1566 }
1567
1568 /// Print a `let pat = scrutinee` expression.
1569 crate fn print_let(&mut self, pat: &ast::Pat, scrutinee: &ast::Expr) {
1570 self.s.word("let ");
1571
1572 self.print_pat(pat);
1573 self.s.space();
1574
1575 self.word_space("=");
1576 self.print_expr_cond_paren(
1577 scrutinee,
1578 Self::cond_needs_par(scrutinee)
1579 || parser::needs_par_as_let_scrutinee(scrutinee.precedence().order()),
1580 )
1581 }
1582
1583 fn print_else(&mut self, els: Option<&ast::Expr>) {
1584 if let Some(_else) = els {
1585 match _else.kind {
1586 // Another `else if` block.
1587 ast::ExprKind::If(ref i, ref then, ref e) => {
1588 self.cbox(INDENT_UNIT - 1);
1589 self.ibox(0);
1590 self.s.word(" else if ");
1591 self.print_expr_as_cond(i);
1592 self.s.space();
1593 self.print_block(then);
1594 self.print_else(e.as_deref())
1595 }
1596 // Final `else` block.
1597 ast::ExprKind::Block(ref b, _) => {
1598 self.cbox(INDENT_UNIT - 1);
1599 self.ibox(0);
1600 self.s.word(" else ");
1601 self.print_block(b)
1602 }
1603 // Constraints would be great here!
1604 _ => {
1605 panic!("print_if saw if with weird alternative");
1606 }
1607 }
1608 }
1609 }
1610
1611 crate fn print_if(&mut self, test: &ast::Expr, blk: &ast::Block, elseopt: Option<&ast::Expr>) {
1612 self.head("if");
1613
1614 self.print_expr_as_cond(test);
1615 self.s.space();
1616
1617 self.print_block(blk);
1618 self.print_else(elseopt)
1619 }
1620
1621 crate fn print_mac(&mut self, m: &ast::MacCall) {
1622 self.print_mac_common(
1623 Some(MacHeader::Path(&m.path)),
1624 true,
1625 None,
1626 m.args.delim(),
1627 &m.args.inner_tokens(),
1628 true,
1629 m.span(),
1630 );
1631 }
1632
1633 fn print_call_post(&mut self, args: &[P<ast::Expr>]) {
1634 self.popen();
1635 self.commasep_exprs(Inconsistent, args);
1636 self.pclose()
1637 }
1638
1639 crate fn print_expr_maybe_paren(&mut self, expr: &ast::Expr, prec: i8) {
1640 self.print_expr_cond_paren(expr, expr.precedence().order() < prec)
1641 }
1642
1643 /// Prints an expr using syntax that's acceptable in a condition position, such as the `cond` in
1644 /// `if cond { ... }`.
1645 crate fn print_expr_as_cond(&mut self, expr: &ast::Expr) {
1646 self.print_expr_cond_paren(expr, Self::cond_needs_par(expr))
1647 }
1648
1649 /// Does `expr` need parenthesis when printed in a condition position?
1650 fn cond_needs_par(expr: &ast::Expr) -> bool {
1651 match expr.kind {
1652 // These cases need parens due to the parse error observed in #26461: `if return {}`
1653 // parses as the erroneous construct `if (return {})`, not `if (return) {}`.
1654 ast::ExprKind::Closure(..) | ast::ExprKind::Ret(..) | ast::ExprKind::Break(..) => true,
1655
1656 _ => parser::contains_exterior_struct_lit(expr),
1657 }
1658 }
1659
1660 /// Prints `expr` or `(expr)` when `needs_par` holds.
1661 fn print_expr_cond_paren(&mut self, expr: &ast::Expr, needs_par: bool) {
1662 if needs_par {
1663 self.popen();
1664 }
1665 self.print_expr(expr);
1666 if needs_par {
1667 self.pclose();
1668 }
1669 }
1670
1671 fn print_expr_vec(&mut self, exprs: &[P<ast::Expr>], attrs: &[ast::Attribute]) {
1672 self.ibox(INDENT_UNIT);
1673 self.s.word("[");
1674 self.print_inner_attributes_inline(attrs);
1675 self.commasep_exprs(Inconsistent, &exprs[..]);
1676 self.s.word("]");
1677 self.end();
1678 }
1679
1680 fn print_expr_repeat(
1681 &mut self,
1682 element: &ast::Expr,
1683 count: &ast::AnonConst,
1684 attrs: &[ast::Attribute],
1685 ) {
1686 self.ibox(INDENT_UNIT);
1687 self.s.word("[");
1688 self.print_inner_attributes_inline(attrs);
1689 self.print_expr(element);
1690 self.word_space(";");
1691 self.print_expr(&count.value);
1692 self.s.word("]");
1693 self.end();
1694 }
1695
1696 fn print_expr_struct(
1697 &mut self,
1698 path: &ast::Path,
1699 fields: &[ast::Field],
1700 wth: &Option<P<ast::Expr>>,
1701 attrs: &[ast::Attribute],
1702 ) {
1703 self.print_path(path, true, 0);
1704 self.s.word("{");
1705 self.print_inner_attributes_inline(attrs);
1706 self.commasep_cmnt(
1707 Consistent,
1708 &fields[..],
1709 |s, field| {
1710 s.print_outer_attributes(&field.attrs);
1711 s.ibox(INDENT_UNIT);
1712 if !field.is_shorthand {
1713 s.print_ident(field.ident);
1714 s.word_space(":");
1715 }
1716 s.print_expr(&field.expr);
1717 s.end();
1718 },
1719 |f| f.span,
1720 );
1721 match *wth {
1722 Some(ref expr) => {
1723 self.ibox(INDENT_UNIT);
1724 if !fields.is_empty() {
1725 self.s.word(",");
1726 self.s.space();
1727 }
1728 self.s.word("..");
1729 self.print_expr(expr);
1730 self.end();
1731 }
1732 _ => {
1733 if !fields.is_empty() {
1734 self.s.word(",")
1735 }
1736 }
1737 }
1738 self.s.word("}");
1739 }
1740
1741 fn print_expr_tup(&mut self, exprs: &[P<ast::Expr>], attrs: &[ast::Attribute]) {
1742 self.popen();
1743 self.print_inner_attributes_inline(attrs);
1744 self.commasep_exprs(Inconsistent, &exprs[..]);
1745 if exprs.len() == 1 {
1746 self.s.word(",");
1747 }
1748 self.pclose()
1749 }
1750
1751 fn print_expr_call(&mut self, func: &ast::Expr, args: &[P<ast::Expr>]) {
1752 let prec = match func.kind {
1753 ast::ExprKind::Field(..) => parser::PREC_FORCE_PAREN,
1754 _ => parser::PREC_POSTFIX,
1755 };
1756
1757 self.print_expr_maybe_paren(func, prec);
1758 self.print_call_post(args)
1759 }
1760
1761 fn print_expr_method_call(&mut self, segment: &ast::PathSegment, args: &[P<ast::Expr>]) {
1762 let base_args = &args[1..];
1763 self.print_expr_maybe_paren(&args[0], parser::PREC_POSTFIX);
1764 self.s.word(".");
1765 self.print_ident(segment.ident);
1766 if let Some(ref args) = segment.args {
1767 self.print_generic_args(args, true);
1768 }
1769 self.print_call_post(base_args)
1770 }
1771
1772 fn print_expr_binary(&mut self, op: ast::BinOp, lhs: &ast::Expr, rhs: &ast::Expr) {
1773 let assoc_op = AssocOp::from_ast_binop(op.node);
1774 let prec = assoc_op.precedence() as i8;
1775 let fixity = assoc_op.fixity();
1776
1777 let (left_prec, right_prec) = match fixity {
1778 Fixity::Left => (prec, prec + 1),
1779 Fixity::Right => (prec + 1, prec),
1780 Fixity::None => (prec + 1, prec + 1),
1781 };
1782
1783 let left_prec = match (&lhs.kind, op.node) {
1784 // These cases need parens: `x as i32 < y` has the parser thinking that `i32 < y` is
1785 // the beginning of a path type. It starts trying to parse `x as (i32 < y ...` instead
1786 // of `(x as i32) < ...`. We need to convince it _not_ to do that.
1787 (&ast::ExprKind::Cast { .. }, ast::BinOpKind::Lt | ast::BinOpKind::Shl) => {
1788 parser::PREC_FORCE_PAREN
1789 }
1790 // We are given `(let _ = a) OP b`.
1791 //
1792 // - When `OP <= LAnd` we should print `let _ = a OP b` to avoid redundant parens
1793 // as the parser will interpret this as `(let _ = a) OP b`.
1794 //
1795 // - Otherwise, e.g. when we have `(let a = b) < c` in AST,
1796 // parens are required since the parser would interpret `let a = b < c` as
1797 // `let a = (b < c)`. To achieve this, we force parens.
1798 (&ast::ExprKind::Let { .. }, _) if !parser::needs_par_as_let_scrutinee(prec) => {
1799 parser::PREC_FORCE_PAREN
1800 }
1801 _ => left_prec,
1802 };
1803
1804 self.print_expr_maybe_paren(lhs, left_prec);
1805 self.s.space();
1806 self.word_space(op.node.to_string());
1807 self.print_expr_maybe_paren(rhs, right_prec)
1808 }
1809
1810 fn print_expr_unary(&mut self, op: ast::UnOp, expr: &ast::Expr) {
1811 self.s.word(ast::UnOp::to_string(op));
1812 self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
1813 }
1814
1815 fn print_expr_addr_of(
1816 &mut self,
1817 kind: ast::BorrowKind,
1818 mutability: ast::Mutability,
1819 expr: &ast::Expr,
1820 ) {
1821 self.s.word("&");
1822 match kind {
1823 ast::BorrowKind::Ref => self.print_mutability(mutability, false),
1824 ast::BorrowKind::Raw => {
1825 self.word_nbsp("raw");
1826 self.print_mutability(mutability, true);
1827 }
1828 }
1829 self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
1830 }
1831
1832 pub fn print_expr(&mut self, expr: &ast::Expr) {
1833 self.print_expr_outer_attr_style(expr, true)
1834 }
1835
1836 fn print_expr_outer_attr_style(&mut self, expr: &ast::Expr, is_inline: bool) {
1837 self.maybe_print_comment(expr.span.lo());
1838
1839 let attrs = &expr.attrs;
1840 if is_inline {
1841 self.print_outer_attributes_inline(attrs);
1842 } else {
1843 self.print_outer_attributes(attrs);
1844 }
1845
1846 self.ibox(INDENT_UNIT);
1847 self.ann.pre(self, AnnNode::Expr(expr));
1848 match expr.kind {
1849 ast::ExprKind::Box(ref expr) => {
1850 self.word_space("box");
1851 self.print_expr_maybe_paren(expr, parser::PREC_PREFIX);
1852 }
1853 ast::ExprKind::Array(ref exprs) => {
1854 self.print_expr_vec(&exprs[..], attrs);
1855 }
1856 ast::ExprKind::Repeat(ref element, ref count) => {
1857 self.print_expr_repeat(element, count, attrs);
1858 }
1859 ast::ExprKind::Struct(ref path, ref fields, ref wth) => {
1860 self.print_expr_struct(path, &fields[..], wth, attrs);
1861 }
1862 ast::ExprKind::Tup(ref exprs) => {
1863 self.print_expr_tup(&exprs[..], attrs);
1864 }
1865 ast::ExprKind::Call(ref func, ref args) => {
1866 self.print_expr_call(func, &args[..]);
1867 }
1868 ast::ExprKind::MethodCall(ref segment, ref args, _) => {
1869 self.print_expr_method_call(segment, &args[..]);
1870 }
1871 ast::ExprKind::Binary(op, ref lhs, ref rhs) => {
1872 self.print_expr_binary(op, lhs, rhs);
1873 }
1874 ast::ExprKind::Unary(op, ref expr) => {
1875 self.print_expr_unary(op, expr);
1876 }
1877 ast::ExprKind::AddrOf(k, m, ref expr) => {
1878 self.print_expr_addr_of(k, m, expr);
1879 }
1880 ast::ExprKind::Lit(ref lit) => {
1881 self.print_literal(lit);
1882 }
1883 ast::ExprKind::Cast(ref expr, ref ty) => {
1884 let prec = AssocOp::As.precedence() as i8;
1885 self.print_expr_maybe_paren(expr, prec);
1886 self.s.space();
1887 self.word_space("as");
1888 self.print_type(ty);
1889 }
1890 ast::ExprKind::Type(ref expr, ref ty) => {
1891 let prec = AssocOp::Colon.precedence() as i8;
1892 self.print_expr_maybe_paren(expr, prec);
1893 self.word_space(":");
1894 self.print_type(ty);
1895 }
1896 ast::ExprKind::Let(ref pat, ref scrutinee) => {
1897 self.print_let(pat, scrutinee);
1898 }
1899 ast::ExprKind::If(ref test, ref blk, ref elseopt) => {
1900 self.print_if(test, blk, elseopt.as_deref())
1901 }
1902 ast::ExprKind::While(ref test, ref blk, opt_label) => {
1903 if let Some(label) = opt_label {
1904 self.print_ident(label.ident);
1905 self.word_space(":");
1906 }
1907 self.head("while");
1908 self.print_expr_as_cond(test);
1909 self.s.space();
1910 self.print_block_with_attrs(blk, attrs);
1911 }
1912 ast::ExprKind::ForLoop(ref pat, ref iter, ref blk, opt_label) => {
1913 if let Some(label) = opt_label {
1914 self.print_ident(label.ident);
1915 self.word_space(":");
1916 }
1917 self.head("for");
1918 self.print_pat(pat);
1919 self.s.space();
1920 self.word_space("in");
1921 self.print_expr_as_cond(iter);
1922 self.s.space();
1923 self.print_block_with_attrs(blk, attrs);
1924 }
1925 ast::ExprKind::Loop(ref blk, opt_label) => {
1926 if let Some(label) = opt_label {
1927 self.print_ident(label.ident);
1928 self.word_space(":");
1929 }
1930 self.head("loop");
1931 self.s.space();
1932 self.print_block_with_attrs(blk, attrs);
1933 }
1934 ast::ExprKind::Match(ref expr, ref arms) => {
1935 self.cbox(INDENT_UNIT);
1936 self.ibox(INDENT_UNIT);
1937 self.word_nbsp("match");
1938 self.print_expr_as_cond(expr);
1939 self.s.space();
1940 self.bopen();
1941 self.print_inner_attributes_no_trailing_hardbreak(attrs);
1942 for arm in arms {
1943 self.print_arm(arm);
1944 }
1945 self.bclose(expr.span);
1946 }
1947 ast::ExprKind::Closure(
1948 capture_clause,
1949 asyncness,
1950 movability,
1951 ref decl,
1952 ref body,
1953 _,
1954 ) => {
1955 self.print_movability(movability);
1956 self.print_asyncness(asyncness);
1957 self.print_capture_clause(capture_clause);
1958
1959 self.print_fn_params_and_ret(decl, true);
1960 self.s.space();
1961 self.print_expr(body);
1962 self.end(); // need to close a box
1963
1964 // a box will be closed by print_expr, but we didn't want an overall
1965 // wrapper so we closed the corresponding opening. so create an
1966 // empty box to satisfy the close.
1967 self.ibox(0);
1968 }
1969 ast::ExprKind::Block(ref blk, opt_label) => {
1970 if let Some(label) = opt_label {
1971 self.print_ident(label.ident);
1972 self.word_space(":");
1973 }
1974 // containing cbox, will be closed by print-block at }
1975 self.cbox(INDENT_UNIT);
1976 // head-box, will be closed by print-block after {
1977 self.ibox(0);
1978 self.print_block_with_attrs(blk, attrs);
1979 }
1980 ast::ExprKind::Async(capture_clause, _, ref blk) => {
1981 self.word_nbsp("async");
1982 self.print_capture_clause(capture_clause);
1983 self.s.space();
1984 // cbox/ibox in analogy to the `ExprKind::Block` arm above
1985 self.cbox(INDENT_UNIT);
1986 self.ibox(0);
1987 self.print_block_with_attrs(blk, attrs);
1988 }
1989 ast::ExprKind::Await(ref expr) => {
1990 self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
1991 self.s.word(".await");
1992 }
1993 ast::ExprKind::Assign(ref lhs, ref rhs, _) => {
1994 let prec = AssocOp::Assign.precedence() as i8;
1995 self.print_expr_maybe_paren(lhs, prec + 1);
1996 self.s.space();
1997 self.word_space("=");
1998 self.print_expr_maybe_paren(rhs, prec);
1999 }
2000 ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
2001 let prec = AssocOp::Assign.precedence() as i8;
2002 self.print_expr_maybe_paren(lhs, prec + 1);
2003 self.s.space();
2004 self.s.word(op.node.to_string());
2005 self.word_space("=");
2006 self.print_expr_maybe_paren(rhs, prec);
2007 }
2008 ast::ExprKind::Field(ref expr, ident) => {
2009 self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
2010 self.s.word(".");
2011 self.print_ident(ident);
2012 }
2013 ast::ExprKind::Index(ref expr, ref index) => {
2014 self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
2015 self.s.word("[");
2016 self.print_expr(index);
2017 self.s.word("]");
2018 }
2019 ast::ExprKind::Range(ref start, ref end, limits) => {
2020 // Special case for `Range`. `AssocOp` claims that `Range` has higher precedence
2021 // than `Assign`, but `x .. x = x` gives a parse error instead of `x .. (x = x)`.
2022 // Here we use a fake precedence value so that any child with lower precedence than
2023 // a "normal" binop gets parenthesized. (`LOr` is the lowest-precedence binop.)
2024 let fake_prec = AssocOp::LOr.precedence() as i8;
2025 if let Some(ref e) = *start {
2026 self.print_expr_maybe_paren(e, fake_prec);
2027 }
2028 if limits == ast::RangeLimits::HalfOpen {
2029 self.s.word("..");
2030 } else {
2031 self.s.word("..=");
2032 }
2033 if let Some(ref e) = *end {
2034 self.print_expr_maybe_paren(e, fake_prec);
2035 }
2036 }
2037 ast::ExprKind::Path(None, ref path) => self.print_path(path, true, 0),
2038 ast::ExprKind::Path(Some(ref qself), ref path) => self.print_qpath(path, qself, true),
2039 ast::ExprKind::Break(opt_label, ref opt_expr) => {
2040 self.s.word("break");
2041 self.s.space();
2042 if let Some(label) = opt_label {
2043 self.print_ident(label.ident);
2044 self.s.space();
2045 }
2046 if let Some(ref expr) = *opt_expr {
2047 self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
2048 self.s.space();
2049 }
2050 }
2051 ast::ExprKind::Continue(opt_label) => {
2052 self.s.word("continue");
2053 self.s.space();
2054 if let Some(label) = opt_label {
2055 self.print_ident(label.ident);
2056 self.s.space()
2057 }
2058 }
2059 ast::ExprKind::Ret(ref result) => {
2060 self.s.word("return");
2061 if let Some(ref expr) = *result {
2062 self.s.word(" ");
2063 self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
2064 }
2065 }
2066 ast::ExprKind::InlineAsm(ref a) => {
2067 enum AsmArg<'a> {
2068 Template(String),
2069 Operand(&'a InlineAsmOperand),
2070 Options(InlineAsmOptions),
2071 }
2072
2073 let mut args = vec![];
2074 args.push(AsmArg::Template(InlineAsmTemplatePiece::to_string(&a.template)));
2075 args.extend(a.operands.iter().map(|(o, _)| AsmArg::Operand(o)));
2076 if !a.options.is_empty() {
2077 args.push(AsmArg::Options(a.options));
2078 }
2079
2080 self.word("asm!");
2081 self.popen();
2082 self.commasep(Consistent, &args, |s, arg| match arg {
2083 AsmArg::Template(template) => s.print_string(&template, ast::StrStyle::Cooked),
2084 AsmArg::Operand(op) => {
2085 let print_reg_or_class = |s: &mut Self, r: &InlineAsmRegOrRegClass| match r
2086 {
2087 InlineAsmRegOrRegClass::Reg(r) => {
2088 s.print_symbol(*r, ast::StrStyle::Cooked)
2089 }
2090 InlineAsmRegOrRegClass::RegClass(r) => s.word(r.to_string()),
2091 };
2092 match op {
2093 InlineAsmOperand::In { reg, expr } => {
2094 s.word("in");
2095 s.popen();
2096 print_reg_or_class(s, reg);
2097 s.pclose();
2098 s.space();
2099 s.print_expr(expr);
2100 }
2101 InlineAsmOperand::Out { reg, late, expr } => {
2102 s.word(if *late { "lateout" } else { "out" });
2103 s.popen();
2104 print_reg_or_class(s, reg);
2105 s.pclose();
2106 s.space();
2107 match expr {
2108 Some(expr) => s.print_expr(expr),
2109 None => s.word("_"),
2110 }
2111 }
2112 InlineAsmOperand::InOut { reg, late, expr } => {
2113 s.word(if *late { "inlateout" } else { "inout" });
2114 s.popen();
2115 print_reg_or_class(s, reg);
2116 s.pclose();
2117 s.space();
2118 s.print_expr(expr);
2119 }
2120 InlineAsmOperand::SplitInOut { reg, late, in_expr, out_expr } => {
2121 s.word(if *late { "inlateout" } else { "inout" });
2122 s.popen();
2123 print_reg_or_class(s, reg);
2124 s.pclose();
2125 s.space();
2126 s.print_expr(in_expr);
2127 s.space();
2128 s.word_space("=>");
2129 match out_expr {
2130 Some(out_expr) => s.print_expr(out_expr),
2131 None => s.word("_"),
2132 }
2133 }
2134 InlineAsmOperand::Const { expr } => {
2135 s.word("const");
2136 s.space();
2137 s.print_expr(expr);
2138 }
2139 InlineAsmOperand::Sym { expr } => {
2140 s.word("sym");
2141 s.space();
2142 s.print_expr(expr);
2143 }
2144 }
2145 }
2146 AsmArg::Options(opts) => {
2147 s.word("options");
2148 s.popen();
2149 let mut options = vec![];
2150 if opts.contains(InlineAsmOptions::PURE) {
2151 options.push("pure");
2152 }
2153 if opts.contains(InlineAsmOptions::NOMEM) {
2154 options.push("nomem");
2155 }
2156 if opts.contains(InlineAsmOptions::READONLY) {
2157 options.push("readonly");
2158 }
2159 if opts.contains(InlineAsmOptions::PRESERVES_FLAGS) {
2160 options.push("preserves_flags");
2161 }
2162 if opts.contains(InlineAsmOptions::NORETURN) {
2163 options.push("noreturn");
2164 }
2165 if opts.contains(InlineAsmOptions::NOSTACK) {
2166 options.push("nostack");
2167 }
2168 if opts.contains(InlineAsmOptions::ATT_SYNTAX) {
2169 options.push("att_syntax");
2170 }
2171 s.commasep(Inconsistent, &options, |s, &opt| {
2172 s.word(opt);
2173 });
2174 s.pclose();
2175 }
2176 });
2177 self.pclose();
2178 }
2179 ast::ExprKind::LlvmInlineAsm(ref a) => {
2180 self.s.word("llvm_asm!");
2181 self.popen();
2182 self.print_symbol(a.asm, a.asm_str_style);
2183 self.word_space(":");
2184
2185 self.commasep(Inconsistent, &a.outputs, |s, out| {
2186 let constraint = out.constraint.as_str();
2187 let mut ch = constraint.chars();
2188 match ch.next() {
2189 Some('=') if out.is_rw => {
2190 s.print_string(&format!("+{}", ch.as_str()), ast::StrStyle::Cooked)
2191 }
2192 _ => s.print_string(&constraint, ast::StrStyle::Cooked),
2193 }
2194 s.popen();
2195 s.print_expr(&out.expr);
2196 s.pclose();
2197 });
2198 self.s.space();
2199 self.word_space(":");
2200
2201 self.commasep(Inconsistent, &a.inputs, |s, &(co, ref o)| {
2202 s.print_symbol(co, ast::StrStyle::Cooked);
2203 s.popen();
2204 s.print_expr(o);
2205 s.pclose();
2206 });
2207 self.s.space();
2208 self.word_space(":");
2209
2210 self.commasep(Inconsistent, &a.clobbers, |s, &co| {
2211 s.print_symbol(co, ast::StrStyle::Cooked);
2212 });
2213
2214 let mut options = vec![];
2215 if a.volatile {
2216 options.push("volatile");
2217 }
2218 if a.alignstack {
2219 options.push("alignstack");
2220 }
2221 if a.dialect == ast::LlvmAsmDialect::Intel {
2222 options.push("intel");
2223 }
2224
2225 if !options.is_empty() {
2226 self.s.space();
2227 self.word_space(":");
2228 self.commasep(Inconsistent, &options, |s, &co| {
2229 s.print_string(co, ast::StrStyle::Cooked);
2230 });
2231 }
2232
2233 self.pclose();
2234 }
2235 ast::ExprKind::MacCall(ref m) => self.print_mac(m),
2236 ast::ExprKind::Paren(ref e) => {
2237 self.popen();
2238 self.print_inner_attributes_inline(attrs);
2239 self.print_expr(e);
2240 self.pclose();
2241 }
2242 ast::ExprKind::Yield(ref e) => {
2243 self.s.word("yield");
2244
2245 if let Some(ref expr) = *e {
2246 self.s.space();
2247 self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
2248 }
2249 }
2250 ast::ExprKind::Try(ref e) => {
2251 self.print_expr_maybe_paren(e, parser::PREC_POSTFIX);
2252 self.s.word("?")
2253 }
2254 ast::ExprKind::TryBlock(ref blk) => {
2255 self.head("try");
2256 self.s.space();
2257 self.print_block_with_attrs(blk, attrs)
2258 }
2259 ast::ExprKind::Err => {
2260 self.popen();
2261 self.s.word("/*ERROR*/");
2262 self.pclose()
2263 }
2264 }
2265 self.ann.post(self, AnnNode::Expr(expr));
2266 self.end();
2267 }
2268
2269 crate fn print_local_decl(&mut self, loc: &ast::Local) {
2270 self.print_pat(&loc.pat);
2271 if let Some(ref ty) = loc.ty {
2272 self.word_space(":");
2273 self.print_type(ty);
2274 }
2275 }
2276
2277 pub fn print_usize(&mut self, i: usize) {
2278 self.s.word(i.to_string())
2279 }
2280
2281 crate fn print_name(&mut self, name: Symbol) {
2282 self.s.word(name.to_string());
2283 self.ann.post(self, AnnNode::Name(&name))
2284 }
2285
2286 fn print_qpath(&mut self, path: &ast::Path, qself: &ast::QSelf, colons_before_params: bool) {
2287 self.s.word("<");
2288 self.print_type(&qself.ty);
2289 if qself.position > 0 {
2290 self.s.space();
2291 self.word_space("as");
2292 let depth = path.segments.len() - qself.position;
2293 self.print_path(path, false, depth);
2294 }
2295 self.s.word(">");
2296 self.s.word("::");
2297 let item_segment = path.segments.last().unwrap();
2298 self.print_ident(item_segment.ident);
2299 if let Some(ref args) = item_segment.args {
2300 self.print_generic_args(args, colons_before_params)
2301 }
2302 }
2303
2304 crate fn print_pat(&mut self, pat: &ast::Pat) {
2305 self.maybe_print_comment(pat.span.lo());
2306 self.ann.pre(self, AnnNode::Pat(pat));
2307 /* Pat isn't normalized, but the beauty of it
2308 is that it doesn't matter */
2309 match pat.kind {
2310 PatKind::Wild => self.s.word("_"),
2311 PatKind::Ident(binding_mode, ident, ref sub) => {
2312 match binding_mode {
2313 ast::BindingMode::ByRef(mutbl) => {
2314 self.word_nbsp("ref");
2315 self.print_mutability(mutbl, false);
2316 }
2317 ast::BindingMode::ByValue(ast::Mutability::Not) => {}
2318 ast::BindingMode::ByValue(ast::Mutability::Mut) => {
2319 self.word_nbsp("mut");
2320 }
2321 }
2322 self.print_ident(ident);
2323 if let Some(ref p) = *sub {
2324 self.s.space();
2325 self.s.word_space("@");
2326 self.print_pat(p);
2327 }
2328 }
2329 PatKind::TupleStruct(ref path, ref elts) => {
2330 self.print_path(path, true, 0);
2331 self.popen();
2332 self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(p));
2333 self.pclose();
2334 }
2335 PatKind::Or(ref pats) => {
2336 self.strsep("|", true, Inconsistent, &pats[..], |s, p| s.print_pat(p));
2337 }
2338 PatKind::Path(None, ref path) => {
2339 self.print_path(path, true, 0);
2340 }
2341 PatKind::Path(Some(ref qself), ref path) => {
2342 self.print_qpath(path, qself, false);
2343 }
2344 PatKind::Struct(ref path, ref fields, etc) => {
2345 self.print_path(path, true, 0);
2346 self.nbsp();
2347 self.word_space("{");
2348 self.commasep_cmnt(
2349 Consistent,
2350 &fields[..],
2351 |s, f| {
2352 s.cbox(INDENT_UNIT);
2353 if !f.is_shorthand {
2354 s.print_ident(f.ident);
2355 s.word_nbsp(":");
2356 }
2357 s.print_pat(&f.pat);
2358 s.end();
2359 },
2360 |f| f.pat.span,
2361 );
2362 if etc {
2363 if !fields.is_empty() {
2364 self.word_space(",");
2365 }
2366 self.s.word("..");
2367 }
2368 self.s.space();
2369 self.s.word("}");
2370 }
2371 PatKind::Tuple(ref elts) => {
2372 self.popen();
2373 self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(p));
2374 if elts.len() == 1 {
2375 self.s.word(",");
2376 }
2377 self.pclose();
2378 }
2379 PatKind::Box(ref inner) => {
2380 self.s.word("box ");
2381 self.print_pat(inner);
2382 }
2383 PatKind::Ref(ref inner, mutbl) => {
2384 self.s.word("&");
2385 if mutbl == ast::Mutability::Mut {
2386 self.s.word("mut ");
2387 }
2388 self.print_pat(inner);
2389 }
2390 PatKind::Lit(ref e) => self.print_expr(&**e),
2391 PatKind::Range(ref begin, ref end, Spanned { node: ref end_kind, .. }) => {
2392 if let Some(e) = begin {
2393 self.print_expr(e);
2394 self.s.space();
2395 }
2396 match *end_kind {
2397 RangeEnd::Included(RangeSyntax::DotDotDot) => self.s.word("..."),
2398 RangeEnd::Included(RangeSyntax::DotDotEq) => self.s.word("..="),
2399 RangeEnd::Excluded => self.s.word(".."),
2400 }
2401 if let Some(e) = end {
2402 self.print_expr(e);
2403 }
2404 }
2405 PatKind::Slice(ref elts) => {
2406 self.s.word("[");
2407 self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(p));
2408 self.s.word("]");
2409 }
2410 PatKind::Rest => self.s.word(".."),
2411 PatKind::Paren(ref inner) => {
2412 self.popen();
2413 self.print_pat(inner);
2414 self.pclose();
2415 }
2416 PatKind::MacCall(ref m) => self.print_mac(m),
2417 }
2418 self.ann.post(self, AnnNode::Pat(pat))
2419 }
2420
2421 fn print_arm(&mut self, arm: &ast::Arm) {
2422 // Note, I have no idea why this check is necessary, but here it is.
2423 if arm.attrs.is_empty() {
2424 self.s.space();
2425 }
2426 self.cbox(INDENT_UNIT);
2427 self.ibox(0);
2428 self.maybe_print_comment(arm.pat.span.lo());
2429 self.print_outer_attributes(&arm.attrs);
2430 self.print_pat(&arm.pat);
2431 self.s.space();
2432 if let Some(ref e) = arm.guard {
2433 self.word_space("if");
2434 self.print_expr(e);
2435 self.s.space();
2436 }
2437 self.word_space("=>");
2438
2439 match arm.body.kind {
2440 ast::ExprKind::Block(ref blk, opt_label) => {
2441 if let Some(label) = opt_label {
2442 self.print_ident(label.ident);
2443 self.word_space(":");
2444 }
2445
2446 // The block will close the pattern's ibox.
2447 self.print_block_unclosed_indent(blk);
2448
2449 // If it is a user-provided unsafe block, print a comma after it.
2450 if let BlockCheckMode::Unsafe(ast::UserProvided) = blk.rules {
2451 self.s.word(",");
2452 }
2453 }
2454 _ => {
2455 self.end(); // Close the ibox for the pattern.
2456 self.print_expr(&arm.body);
2457 self.s.word(",");
2458 }
2459 }
2460 self.end(); // Close enclosing cbox.
2461 }
2462
2463 fn print_explicit_self(&mut self, explicit_self: &ast::ExplicitSelf) {
2464 match explicit_self.node {
2465 SelfKind::Value(m) => {
2466 self.print_mutability(m, false);
2467 self.s.word("self")
2468 }
2469 SelfKind::Region(ref lt, m) => {
2470 self.s.word("&");
2471 self.print_opt_lifetime(lt);
2472 self.print_mutability(m, false);
2473 self.s.word("self")
2474 }
2475 SelfKind::Explicit(ref typ, m) => {
2476 self.print_mutability(m, false);
2477 self.s.word("self");
2478 self.word_space(":");
2479 self.print_type(typ)
2480 }
2481 }
2482 }
2483
2484 fn print_fn_full(
2485 &mut self,
2486 sig: &ast::FnSig,
2487 name: Ident,
2488 generics: &ast::Generics,
2489 vis: &ast::Visibility,
2490 defaultness: ast::Defaultness,
2491 body: Option<&ast::Block>,
2492 attrs: &[ast::Attribute],
2493 ) {
2494 if body.is_some() {
2495 self.head("");
2496 }
2497 self.print_visibility(vis);
2498 self.print_defaultness(defaultness);
2499 self.print_fn(&sig.decl, sig.header, Some(name), generics);
2500 if let Some(body) = body {
2501 self.nbsp();
2502 self.print_block_with_attrs(body, attrs);
2503 } else {
2504 self.s.word(";");
2505 }
2506 }
2507
2508 crate fn print_fn(
2509 &mut self,
2510 decl: &ast::FnDecl,
2511 header: ast::FnHeader,
2512 name: Option<Ident>,
2513 generics: &ast::Generics,
2514 ) {
2515 self.print_fn_header_info(header);
2516 if let Some(name) = name {
2517 self.nbsp();
2518 self.print_ident(name);
2519 }
2520 self.print_generic_params(&generics.params);
2521 self.print_fn_params_and_ret(decl, false);
2522 self.print_where_clause(&generics.where_clause)
2523 }
2524
2525 crate fn print_fn_params_and_ret(&mut self, decl: &ast::FnDecl, is_closure: bool) {
2526 let (open, close) = if is_closure { ("|", "|") } else { ("(", ")") };
2527 self.word(open);
2528 self.commasep(Inconsistent, &decl.inputs, |s, param| s.print_param(param, is_closure));
2529 self.word(close);
2530 self.print_fn_ret_ty(&decl.output)
2531 }
2532
2533 crate fn print_movability(&mut self, movability: ast::Movability) {
2534 match movability {
2535 ast::Movability::Static => self.word_space("static"),
2536 ast::Movability::Movable => {}
2537 }
2538 }
2539
2540 crate fn print_asyncness(&mut self, asyncness: ast::Async) {
2541 if asyncness.is_async() {
2542 self.word_nbsp("async");
2543 }
2544 }
2545
2546 crate fn print_capture_clause(&mut self, capture_clause: ast::CaptureBy) {
2547 match capture_clause {
2548 ast::CaptureBy::Value => self.word_space("move"),
2549 ast::CaptureBy::Ref => {}
2550 }
2551 }
2552
2553 pub fn print_type_bounds(&mut self, prefix: &'static str, bounds: &[ast::GenericBound]) {
2554 if !bounds.is_empty() {
2555 self.s.word(prefix);
2556 let mut first = true;
2557 for bound in bounds {
2558 if !(first && prefix.is_empty()) {
2559 self.nbsp();
2560 }
2561 if first {
2562 first = false;
2563 } else {
2564 self.word_space("+");
2565 }
2566
2567 match bound {
2568 GenericBound::Trait(tref, modifier) => {
2569 if modifier == &TraitBoundModifier::Maybe {
2570 self.s.word("?");
2571 }
2572 self.print_poly_trait_ref(tref);
2573 }
2574 GenericBound::Outlives(lt) => self.print_lifetime(*lt),
2575 }
2576 }
2577 }
2578 }
2579
2580 crate fn print_lifetime(&mut self, lifetime: ast::Lifetime) {
2581 self.print_name(lifetime.ident.name)
2582 }
2583
2584 crate fn print_lifetime_bounds(
2585 &mut self,
2586 lifetime: ast::Lifetime,
2587 bounds: &ast::GenericBounds,
2588 ) {
2589 self.print_lifetime(lifetime);
2590 if !bounds.is_empty() {
2591 self.s.word(": ");
2592 for (i, bound) in bounds.iter().enumerate() {
2593 if i != 0 {
2594 self.s.word(" + ");
2595 }
2596 match bound {
2597 ast::GenericBound::Outlives(lt) => self.print_lifetime(*lt),
2598 _ => panic!(),
2599 }
2600 }
2601 }
2602 }
2603
2604 crate fn print_generic_params(&mut self, generic_params: &[ast::GenericParam]) {
2605 if generic_params.is_empty() {
2606 return;
2607 }
2608
2609 self.s.word("<");
2610
2611 self.commasep(Inconsistent, &generic_params, |s, param| {
2612 s.print_outer_attributes_inline(&param.attrs);
2613
2614 match param.kind {
2615 ast::GenericParamKind::Lifetime => {
2616 let lt = ast::Lifetime { id: param.id, ident: param.ident };
2617 s.print_lifetime_bounds(lt, &param.bounds)
2618 }
2619 ast::GenericParamKind::Type { ref default } => {
2620 s.print_ident(param.ident);
2621 s.print_type_bounds(":", &param.bounds);
2622 if let Some(ref default) = default {
2623 s.s.space();
2624 s.word_space("=");
2625 s.print_type(default)
2626 }
2627 }
2628 ast::GenericParamKind::Const { ref ty, kw_span: _ } => {
2629 s.word_space("const");
2630 s.print_ident(param.ident);
2631 s.s.space();
2632 s.word_space(":");
2633 s.print_type(ty);
2634 s.print_type_bounds(":", &param.bounds)
2635 }
2636 }
2637 });
2638
2639 self.s.word(">");
2640 }
2641
2642 crate fn print_where_clause(&mut self, where_clause: &ast::WhereClause) {
2643 if where_clause.predicates.is_empty() && !where_clause.has_where_token {
2644 return;
2645 }
2646
2647 self.s.space();
2648 self.word_space("where");
2649
2650 for (i, predicate) in where_clause.predicates.iter().enumerate() {
2651 if i != 0 {
2652 self.word_space(",");
2653 }
2654
2655 match *predicate {
2656 ast::WherePredicate::BoundPredicate(ast::WhereBoundPredicate {
2657 ref bound_generic_params,
2658 ref bounded_ty,
2659 ref bounds,
2660 ..
2661 }) => {
2662 self.print_formal_generic_params(bound_generic_params);
2663 self.print_type(bounded_ty);
2664 self.print_type_bounds(":", bounds);
2665 }
2666 ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate {
2667 ref lifetime,
2668 ref bounds,
2669 ..
2670 }) => {
2671 self.print_lifetime_bounds(*lifetime, bounds);
2672 }
2673 ast::WherePredicate::EqPredicate(ast::WhereEqPredicate {
2674 ref lhs_ty,
2675 ref rhs_ty,
2676 ..
2677 }) => {
2678 self.print_type(lhs_ty);
2679 self.s.space();
2680 self.word_space("=");
2681 self.print_type(rhs_ty);
2682 }
2683 }
2684 }
2685 }
2686
2687 crate fn print_use_tree(&mut self, tree: &ast::UseTree) {
2688 match tree.kind {
2689 ast::UseTreeKind::Simple(rename, ..) => {
2690 self.print_path(&tree.prefix, false, 0);
2691 if let Some(rename) = rename {
2692 self.s.space();
2693 self.word_space("as");
2694 self.print_ident(rename);
2695 }
2696 }
2697 ast::UseTreeKind::Glob => {
2698 if !tree.prefix.segments.is_empty() {
2699 self.print_path(&tree.prefix, false, 0);
2700 self.s.word("::");
2701 }
2702 self.s.word("*");
2703 }
2704 ast::UseTreeKind::Nested(ref items) => {
2705 if tree.prefix.segments.is_empty() {
2706 self.s.word("{");
2707 } else {
2708 self.print_path(&tree.prefix, false, 0);
2709 self.s.word("::{");
2710 }
2711 self.commasep(Inconsistent, &items[..], |this, &(ref tree, _)| {
2712 this.print_use_tree(tree)
2713 });
2714 self.s.word("}");
2715 }
2716 }
2717 }
2718
2719 pub fn print_mutability(&mut self, mutbl: ast::Mutability, print_const: bool) {
2720 match mutbl {
2721 ast::Mutability::Mut => self.word_nbsp("mut"),
2722 ast::Mutability::Not => {
2723 if print_const {
2724 self.word_nbsp("const");
2725 }
2726 }
2727 }
2728 }
2729
2730 crate fn print_mt(&mut self, mt: &ast::MutTy, print_const: bool) {
2731 self.print_mutability(mt.mutbl, print_const);
2732 self.print_type(&mt.ty)
2733 }
2734
2735 crate fn print_param(&mut self, input: &ast::Param, is_closure: bool) {
2736 self.ibox(INDENT_UNIT);
2737
2738 self.print_outer_attributes_inline(&input.attrs);
2739
2740 match input.ty.kind {
2741 ast::TyKind::Infer if is_closure => self.print_pat(&input.pat),
2742 _ => {
2743 if let Some(eself) = input.to_self() {
2744 self.print_explicit_self(&eself);
2745 } else {
2746 let invalid = if let PatKind::Ident(_, ident, _) = input.pat.kind {
2747 ident.name == kw::Invalid
2748 } else {
2749 false
2750 };
2751 if !invalid {
2752 self.print_pat(&input.pat);
2753 self.s.word(":");
2754 self.s.space();
2755 }
2756 self.print_type(&input.ty);
2757 }
2758 }
2759 }
2760 self.end();
2761 }
2762
2763 crate fn print_fn_ret_ty(&mut self, fn_ret_ty: &ast::FnRetTy) {
2764 if let ast::FnRetTy::Ty(ty) = fn_ret_ty {
2765 self.space_if_not_bol();
2766 self.ibox(INDENT_UNIT);
2767 self.word_space("->");
2768 self.print_type(ty);
2769 self.end();
2770 self.maybe_print_comment(ty.span.lo());
2771 }
2772 }
2773
2774 crate fn print_ty_fn(
2775 &mut self,
2776 ext: ast::Extern,
2777 unsafety: ast::Unsafe,
2778 decl: &ast::FnDecl,
2779 name: Option<Ident>,
2780 generic_params: &[ast::GenericParam],
2781 ) {
2782 self.ibox(INDENT_UNIT);
2783 if !generic_params.is_empty() {
2784 self.s.word("for");
2785 self.print_generic_params(generic_params);
2786 }
2787 let generics = ast::Generics {
2788 params: Vec::new(),
2789 where_clause: ast::WhereClause {
2790 has_where_token: false,
2791 predicates: Vec::new(),
2792 span: rustc_span::DUMMY_SP,
2793 },
2794 span: rustc_span::DUMMY_SP,
2795 };
2796 let header = ast::FnHeader { unsafety, ext, ..ast::FnHeader::default() };
2797 self.print_fn(decl, header, name, &generics);
2798 self.end();
2799 }
2800
2801 crate fn maybe_print_trailing_comment(
2802 &mut self,
2803 span: rustc_span::Span,
2804 next_pos: Option<BytePos>,
2805 ) {
2806 if let Some(cmnts) = self.comments() {
2807 if let Some(cmnt) = cmnts.trailing_comment(span, next_pos) {
2808 self.print_comment(&cmnt);
2809 }
2810 }
2811 }
2812
2813 crate fn print_remaining_comments(&mut self) {
2814 // If there aren't any remaining comments, then we need to manually
2815 // make sure there is a line break at the end.
2816 if self.next_comment().is_none() {
2817 self.s.hardbreak();
2818 }
2819 while let Some(ref cmnt) = self.next_comment() {
2820 self.print_comment(cmnt);
2821 }
2822 }
2823
2824 crate fn print_fn_header_info(&mut self, header: ast::FnHeader) {
2825 self.print_constness(header.constness);
2826 self.print_asyncness(header.asyncness);
2827 self.print_unsafety(header.unsafety);
2828
2829 match header.ext {
2830 ast::Extern::None => {}
2831 ast::Extern::Implicit => {
2832 self.word_nbsp("extern");
2833 }
2834 ast::Extern::Explicit(abi) => {
2835 self.word_nbsp("extern");
2836 self.print_literal(&abi.as_lit());
2837 self.nbsp();
2838 }
2839 }
2840
2841 self.s.word("fn")
2842 }
2843
2844 crate fn print_unsafety(&mut self, s: ast::Unsafe) {
2845 match s {
2846 ast::Unsafe::No => {}
2847 ast::Unsafe::Yes(_) => self.word_nbsp("unsafe"),
2848 }
2849 }
2850
2851 crate fn print_constness(&mut self, s: ast::Const) {
2852 match s {
2853 ast::Const::No => {}
2854 ast::Const::Yes(_) => self.word_nbsp("const"),
2855 }
2856 }
2857
2858 crate fn print_is_auto(&mut self, s: ast::IsAuto) {
2859 match s {
2860 ast::IsAuto::Yes => self.word_nbsp("auto"),
2861 ast::IsAuto::No => {}
2862 }
2863 }
2864 }
backport for Debian buster