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1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 pub use self::AnnNode::*;
12
13 use syntax::abi::Abi;
14 use syntax::ast;
15 use syntax::codemap::{self, CodeMap, BytePos, Spanned};
16 use syntax::errors;
17 use syntax::parse::token::{self, BinOpToken};
18 use syntax::parse::lexer::comments;
19 use syntax::parse;
20 use syntax::print::pp::{self, break_offset, word, space, hardbreak};
21 use syntax::print::pp::{Breaks, eof};
22 use syntax::print::pp::Breaks::{Consistent, Inconsistent};
23 use syntax::print::pprust::{self as ast_pp, PrintState};
24 use syntax::ptr::P;
25
26 use hir;
27 use hir::{Crate, PatKind, RegionTyParamBound, TraitTyParamBound, TraitBoundModifier};
28
29 use std::io::{self, Write, Read};
30
31 pub enum AnnNode<'a> {
32 NodeName(&'a ast::Name),
33 NodeBlock(&'a hir::Block),
34 NodeItem(&'a hir::Item),
35 NodeSubItem(ast::NodeId),
36 NodeExpr(&'a hir::Expr),
37 NodePat(&'a hir::Pat),
38 }
39
40 pub trait PpAnn {
41 fn pre(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> {
42 Ok(())
43 }
44 fn post(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> {
45 Ok(())
46 }
47 }
48
49 #[derive(Copy, Clone)]
50 pub struct NoAnn;
51
52 impl PpAnn for NoAnn {}
53
54
55 pub struct State<'a> {
56 krate: Option<&'a Crate>,
57 pub s: pp::Printer<'a>,
58 cm: Option<&'a CodeMap>,
59 comments: Option<Vec<comments::Comment>>,
60 literals: Option<Vec<comments::Literal>>,
61 cur_cmnt_and_lit: ast_pp::CurrentCommentAndLiteral,
62 boxes: Vec<pp::Breaks>,
63 ann: &'a (PpAnn + 'a),
64 }
65
66 impl<'a> PrintState<'a> for State<'a> {
67 fn writer(&mut self) -> &mut pp::Printer<'a> {
68 &mut self.s
69 }
70
71 fn boxes(&mut self) -> &mut Vec<pp::Breaks> {
72 &mut self.boxes
73 }
74
75 fn comments(&mut self) -> &mut Option<Vec<comments::Comment>> {
76 &mut self.comments
77 }
78
79 fn cur_cmnt_and_lit(&mut self) -> &mut ast_pp::CurrentCommentAndLiteral {
80 &mut self.cur_cmnt_and_lit
81 }
82
83 fn literals(&self) -> &Option<Vec<comments::Literal>> {
84 &self.literals
85 }
86 }
87
88 pub fn rust_printer<'a>(writer: Box<Write + 'a>, krate: Option<&'a Crate>) -> State<'a> {
89 static NO_ANN: NoAnn = NoAnn;
90 rust_printer_annotated(writer, &NO_ANN, krate)
91 }
92
93 pub fn rust_printer_annotated<'a>(writer: Box<Write + 'a>,
94 ann: &'a PpAnn,
95 krate: Option<&'a Crate>)
96 -> State<'a> {
97 State {
98 krate: krate,
99 s: pp::mk_printer(writer, default_columns),
100 cm: None,
101 comments: None,
102 literals: None,
103 cur_cmnt_and_lit: ast_pp::CurrentCommentAndLiteral {
104 cur_cmnt: 0,
105 cur_lit: 0,
106 },
107 boxes: Vec::new(),
108 ann: ann,
109 }
110 }
111
112 #[allow(non_upper_case_globals)]
113 pub const indent_unit: usize = 4;
114
115 #[allow(non_upper_case_globals)]
116 pub const default_columns: usize = 78;
117
118
119 /// Requires you to pass an input filename and reader so that
120 /// it can scan the input text for comments and literals to
121 /// copy forward.
122 pub fn print_crate<'a>(cm: &'a CodeMap,
123 span_diagnostic: &errors::Handler,
124 krate: &hir::Crate,
125 filename: String,
126 input: &mut Read,
127 out: Box<Write + 'a>,
128 ann: &'a PpAnn,
129 is_expanded: bool)
130 -> io::Result<()> {
131 let mut s = State::new_from_input(cm, span_diagnostic, filename, input,
132 out, ann, is_expanded, Some(krate));
133
134 // When printing the AST, we sometimes need to inject `#[no_std]` here.
135 // Since you can't compile the HIR, it's not necessary.
136
137 try!(s.print_mod(&krate.module, &krate.attrs));
138 try!(s.print_remaining_comments());
139 eof(&mut s.s)
140 }
141
142 impl<'a> State<'a> {
143 pub fn new_from_input(cm: &'a CodeMap,
144 span_diagnostic: &errors::Handler,
145 filename: String,
146 input: &mut Read,
147 out: Box<Write + 'a>,
148 ann: &'a PpAnn,
149 is_expanded: bool,
150 krate: Option<&'a Crate>)
151 -> State<'a> {
152 let (cmnts, lits) = comments::gather_comments_and_literals(span_diagnostic,
153 filename,
154 input);
155
156 State::new(cm,
157 out,
158 ann,
159 Some(cmnts),
160 // If the code is post expansion, don't use the table of
161 // literals, since it doesn't correspond with the literals
162 // in the AST anymore.
163 if is_expanded {
164 None
165 } else {
166 Some(lits)
167 },
168 krate)
169 }
170
171 pub fn new(cm: &'a CodeMap,
172 out: Box<Write + 'a>,
173 ann: &'a PpAnn,
174 comments: Option<Vec<comments::Comment>>,
175 literals: Option<Vec<comments::Literal>>,
176 krate: Option<&'a Crate>)
177 -> State<'a> {
178 State {
179 krate: krate,
180 s: pp::mk_printer(out, default_columns),
181 cm: Some(cm),
182 comments: comments.clone(),
183 literals: literals.clone(),
184 cur_cmnt_and_lit: ast_pp::CurrentCommentAndLiteral {
185 cur_cmnt: 0,
186 cur_lit: 0,
187 },
188 boxes: Vec::new(),
189 ann: ann,
190 }
191 }
192 }
193
194 pub fn to_string<F>(f: F) -> String
195 where F: FnOnce(&mut State) -> io::Result<()>
196 {
197 let mut wr = Vec::new();
198 {
199 let mut printer = rust_printer(Box::new(&mut wr), None);
200 f(&mut printer).unwrap();
201 eof(&mut printer.s).unwrap();
202 }
203 String::from_utf8(wr).unwrap()
204 }
205
206 pub fn binop_to_string(op: BinOpToken) -> &'static str {
207 match op {
208 token::Plus => "+",
209 token::Minus => "-",
210 token::Star => "*",
211 token::Slash => "/",
212 token::Percent => "%",
213 token::Caret => "^",
214 token::And => "&",
215 token::Or => "|",
216 token::Shl => "<<",
217 token::Shr => ">>",
218 }
219 }
220
221 pub fn ty_to_string(ty: &hir::Ty) -> String {
222 to_string(|s| s.print_type(ty))
223 }
224
225 pub fn bounds_to_string(bounds: &[hir::TyParamBound]) -> String {
226 to_string(|s| s.print_bounds("", bounds))
227 }
228
229 pub fn pat_to_string(pat: &hir::Pat) -> String {
230 to_string(|s| s.print_pat(pat))
231 }
232
233 pub fn arm_to_string(arm: &hir::Arm) -> String {
234 to_string(|s| s.print_arm(arm))
235 }
236
237 pub fn expr_to_string(e: &hir::Expr) -> String {
238 to_string(|s| s.print_expr(e))
239 }
240
241 pub fn lifetime_to_string(e: &hir::Lifetime) -> String {
242 to_string(|s| s.print_lifetime(e))
243 }
244
245 pub fn stmt_to_string(stmt: &hir::Stmt) -> String {
246 to_string(|s| s.print_stmt(stmt))
247 }
248
249 pub fn item_to_string(i: &hir::Item) -> String {
250 to_string(|s| s.print_item(i))
251 }
252
253 pub fn impl_item_to_string(i: &hir::ImplItem) -> String {
254 to_string(|s| s.print_impl_item(i))
255 }
256
257 pub fn trait_item_to_string(i: &hir::TraitItem) -> String {
258 to_string(|s| s.print_trait_item(i))
259 }
260
261 pub fn generics_to_string(generics: &hir::Generics) -> String {
262 to_string(|s| s.print_generics(generics))
263 }
264
265 pub fn where_clause_to_string(i: &hir::WhereClause) -> String {
266 to_string(|s| s.print_where_clause(i))
267 }
268
269 pub fn fn_block_to_string(p: &hir::FnDecl) -> String {
270 to_string(|s| s.print_fn_block_args(p))
271 }
272
273 pub fn path_to_string(p: &hir::Path) -> String {
274 to_string(|s| s.print_path(p, false, 0))
275 }
276
277 pub fn name_to_string(name: ast::Name) -> String {
278 to_string(|s| s.print_name(name))
279 }
280
281 pub fn fun_to_string(decl: &hir::FnDecl,
282 unsafety: hir::Unsafety,
283 constness: hir::Constness,
284 name: ast::Name,
285 opt_explicit_self: Option<&hir::ExplicitSelf_>,
286 generics: &hir::Generics)
287 -> String {
288 to_string(|s| {
289 try!(s.head(""));
290 try!(s.print_fn(decl,
291 unsafety,
292 constness,
293 Abi::Rust,
294 Some(name),
295 generics,
296 opt_explicit_self,
297 hir::Inherited));
298 try!(s.end()); // Close the head box
299 s.end() // Close the outer box
300 })
301 }
302
303 pub fn block_to_string(blk: &hir::Block) -> String {
304 to_string(|s| {
305 // containing cbox, will be closed by print-block at }
306 try!(s.cbox(indent_unit));
307 // head-ibox, will be closed by print-block after {
308 try!(s.ibox(0));
309 s.print_block(blk)
310 })
311 }
312
313 pub fn explicit_self_to_string(explicit_self: &hir::ExplicitSelf_) -> String {
314 to_string(|s| s.print_explicit_self(explicit_self, hir::MutImmutable).map(|_| {}))
315 }
316
317 pub fn variant_to_string(var: &hir::Variant) -> String {
318 to_string(|s| s.print_variant(var))
319 }
320
321 pub fn arg_to_string(arg: &hir::Arg) -> String {
322 to_string(|s| s.print_arg(arg, false))
323 }
324
325 pub fn visibility_qualified(vis: hir::Visibility, s: &str) -> String {
326 match vis {
327 hir::Public => format!("pub {}", s),
328 hir::Inherited => s.to_string(),
329 }
330 }
331
332 fn needs_parentheses(expr: &hir::Expr) -> bool {
333 match expr.node {
334 hir::ExprAssign(..) |
335 hir::ExprBinary(..) |
336 hir::ExprClosure(..) |
337 hir::ExprAssignOp(..) |
338 hir::ExprCast(..) |
339 hir::ExprType(..) => true,
340 _ => false,
341 }
342 }
343
344 impl<'a> State<'a> {
345 pub fn cbox(&mut self, u: usize) -> io::Result<()> {
346 self.boxes.push(pp::Breaks::Consistent);
347 pp::cbox(&mut self.s, u)
348 }
349
350 pub fn nbsp(&mut self) -> io::Result<()> {
351 word(&mut self.s, " ")
352 }
353
354 pub fn word_nbsp(&mut self, w: &str) -> io::Result<()> {
355 try!(word(&mut self.s, w));
356 self.nbsp()
357 }
358
359 pub fn head(&mut self, w: &str) -> io::Result<()> {
360 // outer-box is consistent
361 try!(self.cbox(indent_unit));
362 // head-box is inconsistent
363 try!(self.ibox(w.len() + 1));
364 // keyword that starts the head
365 if !w.is_empty() {
366 try!(self.word_nbsp(w));
367 }
368 Ok(())
369 }
370
371 pub fn bopen(&mut self) -> io::Result<()> {
372 try!(word(&mut self.s, "{"));
373 self.end() // close the head-box
374 }
375
376 pub fn bclose_(&mut self, span: codemap::Span, indented: usize) -> io::Result<()> {
377 self.bclose_maybe_open(span, indented, true)
378 }
379 pub fn bclose_maybe_open(&mut self,
380 span: codemap::Span,
381 indented: usize,
382 close_box: bool)
383 -> io::Result<()> {
384 try!(self.maybe_print_comment(span.hi));
385 try!(self.break_offset_if_not_bol(1, -(indented as isize)));
386 try!(word(&mut self.s, "}"));
387 if close_box {
388 try!(self.end()); // close the outer-box
389 }
390 Ok(())
391 }
392 pub fn bclose(&mut self, span: codemap::Span) -> io::Result<()> {
393 self.bclose_(span, indent_unit)
394 }
395
396 pub fn in_cbox(&self) -> bool {
397 match self.boxes.last() {
398 Some(&last_box) => last_box == pp::Breaks::Consistent,
399 None => false,
400 }
401 }
402 pub fn space_if_not_bol(&mut self) -> io::Result<()> {
403 if !self.is_bol() {
404 try!(space(&mut self.s));
405 }
406 Ok(())
407 }
408 pub fn break_offset_if_not_bol(&mut self, n: usize, off: isize) -> io::Result<()> {
409 if !self.is_bol() {
410 break_offset(&mut self.s, n, off)
411 } else {
412 if off != 0 && self.s.last_token().is_hardbreak_tok() {
413 // We do something pretty sketchy here: tuck the nonzero
414 // offset-adjustment we were going to deposit along with the
415 // break into the previous hardbreak.
416 self.s.replace_last_token(pp::hardbreak_tok_offset(off));
417 }
418 Ok(())
419 }
420 }
421
422 // Synthesizes a comment that was not textually present in the original source
423 // file.
424 pub fn synth_comment(&mut self, text: String) -> io::Result<()> {
425 try!(word(&mut self.s, "/*"));
426 try!(space(&mut self.s));
427 try!(word(&mut self.s, &text[..]));
428 try!(space(&mut self.s));
429 word(&mut self.s, "*/")
430 }
431
432
433 pub fn commasep_cmnt<T, F, G>(&mut self,
434 b: Breaks,
435 elts: &[T],
436 mut op: F,
437 mut get_span: G)
438 -> io::Result<()>
439 where F: FnMut(&mut State, &T) -> io::Result<()>,
440 G: FnMut(&T) -> codemap::Span
441 {
442 try!(self.rbox(0, b));
443 let len = elts.len();
444 let mut i = 0;
445 for elt in elts {
446 try!(self.maybe_print_comment(get_span(elt).hi));
447 try!(op(self, elt));
448 i += 1;
449 if i < len {
450 try!(word(&mut self.s, ","));
451 try!(self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi)));
452 try!(self.space_if_not_bol());
453 }
454 }
455 self.end()
456 }
457
458 pub fn commasep_exprs(&mut self, b: Breaks, exprs: &[P<hir::Expr>]) -> io::Result<()> {
459 self.commasep_cmnt(b, exprs, |s, e| s.print_expr(&e), |e| e.span)
460 }
461
462 pub fn print_mod(&mut self, _mod: &hir::Mod, attrs: &[ast::Attribute]) -> io::Result<()> {
463 try!(self.print_inner_attributes(attrs));
464 for item_id in &_mod.item_ids {
465 try!(self.print_item_id(item_id));
466 }
467 Ok(())
468 }
469
470 pub fn print_foreign_mod(&mut self,
471 nmod: &hir::ForeignMod,
472 attrs: &[ast::Attribute])
473 -> io::Result<()> {
474 try!(self.print_inner_attributes(attrs));
475 for item in &nmod.items {
476 try!(self.print_foreign_item(item));
477 }
478 Ok(())
479 }
480
481 pub fn print_opt_lifetime(&mut self, lifetime: &Option<hir::Lifetime>) -> io::Result<()> {
482 if let Some(l) = *lifetime {
483 try!(self.print_lifetime(&l));
484 try!(self.nbsp());
485 }
486 Ok(())
487 }
488
489 pub fn print_type(&mut self, ty: &hir::Ty) -> io::Result<()> {
490 try!(self.maybe_print_comment(ty.span.lo));
491 try!(self.ibox(0));
492 match ty.node {
493 hir::TyVec(ref ty) => {
494 try!(word(&mut self.s, "["));
495 try!(self.print_type(&ty));
496 try!(word(&mut self.s, "]"));
497 }
498 hir::TyPtr(ref mt) => {
499 try!(word(&mut self.s, "*"));
500 match mt.mutbl {
501 hir::MutMutable => try!(self.word_nbsp("mut")),
502 hir::MutImmutable => try!(self.word_nbsp("const")),
503 }
504 try!(self.print_type(&mt.ty));
505 }
506 hir::TyRptr(ref lifetime, ref mt) => {
507 try!(word(&mut self.s, "&"));
508 try!(self.print_opt_lifetime(lifetime));
509 try!(self.print_mt(mt));
510 }
511 hir::TyTup(ref elts) => {
512 try!(self.popen());
513 try!(self.commasep(Inconsistent, &elts[..], |s, ty| s.print_type(&ty)));
514 if elts.len() == 1 {
515 try!(word(&mut self.s, ","));
516 }
517 try!(self.pclose());
518 }
519 hir::TyBareFn(ref f) => {
520 let generics = hir::Generics {
521 lifetimes: f.lifetimes.clone(),
522 ty_params: hir::HirVec::new(),
523 where_clause: hir::WhereClause {
524 id: ast::DUMMY_NODE_ID,
525 predicates: hir::HirVec::new(),
526 },
527 };
528 try!(self.print_ty_fn(f.abi, f.unsafety, &f.decl, None, &generics, None));
529 }
530 hir::TyPath(None, ref path) => {
531 try!(self.print_path(path, false, 0));
532 }
533 hir::TyPath(Some(ref qself), ref path) => {
534 try!(self.print_qpath(path, qself, false))
535 }
536 hir::TyObjectSum(ref ty, ref bounds) => {
537 try!(self.print_type(&ty));
538 try!(self.print_bounds("+", &bounds[..]));
539 }
540 hir::TyPolyTraitRef(ref bounds) => {
541 try!(self.print_bounds("", &bounds[..]));
542 }
543 hir::TyFixedLengthVec(ref ty, ref v) => {
544 try!(word(&mut self.s, "["));
545 try!(self.print_type(&ty));
546 try!(word(&mut self.s, "; "));
547 try!(self.print_expr(&v));
548 try!(word(&mut self.s, "]"));
549 }
550 hir::TyTypeof(ref e) => {
551 try!(word(&mut self.s, "typeof("));
552 try!(self.print_expr(&e));
553 try!(word(&mut self.s, ")"));
554 }
555 hir::TyInfer => {
556 try!(word(&mut self.s, "_"));
557 }
558 }
559 self.end()
560 }
561
562 pub fn print_foreign_item(&mut self, item: &hir::ForeignItem) -> io::Result<()> {
563 try!(self.hardbreak_if_not_bol());
564 try!(self.maybe_print_comment(item.span.lo));
565 try!(self.print_outer_attributes(&item.attrs));
566 match item.node {
567 hir::ForeignItemFn(ref decl, ref generics) => {
568 try!(self.head(""));
569 try!(self.print_fn(decl,
570 hir::Unsafety::Normal,
571 hir::Constness::NotConst,
572 Abi::Rust,
573 Some(item.name),
574 generics,
575 None,
576 item.vis));
577 try!(self.end()); // end head-ibox
578 try!(word(&mut self.s, ";"));
579 self.end() // end the outer fn box
580 }
581 hir::ForeignItemStatic(ref t, m) => {
582 try!(self.head(&visibility_qualified(item.vis, "static")));
583 if m {
584 try!(self.word_space("mut"));
585 }
586 try!(self.print_name(item.name));
587 try!(self.word_space(":"));
588 try!(self.print_type(&t));
589 try!(word(&mut self.s, ";"));
590 try!(self.end()); // end the head-ibox
591 self.end() // end the outer cbox
592 }
593 }
594 }
595
596 fn print_associated_const(&mut self,
597 name: ast::Name,
598 ty: &hir::Ty,
599 default: Option<&hir::Expr>,
600 vis: hir::Visibility)
601 -> io::Result<()> {
602 try!(word(&mut self.s, &visibility_qualified(vis, "")));
603 try!(self.word_space("const"));
604 try!(self.print_name(name));
605 try!(self.word_space(":"));
606 try!(self.print_type(ty));
607 if let Some(expr) = default {
608 try!(space(&mut self.s));
609 try!(self.word_space("="));
610 try!(self.print_expr(expr));
611 }
612 word(&mut self.s, ";")
613 }
614
615 fn print_associated_type(&mut self,
616 name: ast::Name,
617 bounds: Option<&hir::TyParamBounds>,
618 ty: Option<&hir::Ty>)
619 -> io::Result<()> {
620 try!(self.word_space("type"));
621 try!(self.print_name(name));
622 if let Some(bounds) = bounds {
623 try!(self.print_bounds(":", bounds));
624 }
625 if let Some(ty) = ty {
626 try!(space(&mut self.s));
627 try!(self.word_space("="));
628 try!(self.print_type(ty));
629 }
630 word(&mut self.s, ";")
631 }
632
633 pub fn print_item_id(&mut self, item_id: &hir::ItemId) -> io::Result<()> {
634 if let Some(krate) = self.krate {
635 // skip nested items if krate context was not provided
636 let item = &krate.items[&item_id.id];
637 self.print_item(item)
638 } else {
639 Ok(())
640 }
641 }
642
643 /// Pretty-print an item
644 pub fn print_item(&mut self, item: &hir::Item) -> io::Result<()> {
645 try!(self.hardbreak_if_not_bol());
646 try!(self.maybe_print_comment(item.span.lo));
647 try!(self.print_outer_attributes(&item.attrs));
648 try!(self.ann.pre(self, NodeItem(item)));
649 match item.node {
650 hir::ItemExternCrate(ref optional_path) => {
651 try!(self.head(&visibility_qualified(item.vis, "extern crate")));
652 if let Some(p) = *optional_path {
653 let val = p.as_str();
654 if val.contains("-") {
655 try!(self.print_string(&val, ast::StrStyle::Cooked));
656 } else {
657 try!(self.print_name(p));
658 }
659 try!(space(&mut self.s));
660 try!(word(&mut self.s, "as"));
661 try!(space(&mut self.s));
662 }
663 try!(self.print_name(item.name));
664 try!(word(&mut self.s, ";"));
665 try!(self.end()); // end inner head-block
666 try!(self.end()); // end outer head-block
667 }
668 hir::ItemUse(ref vp) => {
669 try!(self.head(&visibility_qualified(item.vis, "use")));
670 try!(self.print_view_path(&vp));
671 try!(word(&mut self.s, ";"));
672 try!(self.end()); // end inner head-block
673 try!(self.end()); // end outer head-block
674 }
675 hir::ItemStatic(ref ty, m, ref expr) => {
676 try!(self.head(&visibility_qualified(item.vis, "static")));
677 if m == hir::MutMutable {
678 try!(self.word_space("mut"));
679 }
680 try!(self.print_name(item.name));
681 try!(self.word_space(":"));
682 try!(self.print_type(&ty));
683 try!(space(&mut self.s));
684 try!(self.end()); // end the head-ibox
685
686 try!(self.word_space("="));
687 try!(self.print_expr(&expr));
688 try!(word(&mut self.s, ";"));
689 try!(self.end()); // end the outer cbox
690 }
691 hir::ItemConst(ref ty, ref expr) => {
692 try!(self.head(&visibility_qualified(item.vis, "const")));
693 try!(self.print_name(item.name));
694 try!(self.word_space(":"));
695 try!(self.print_type(&ty));
696 try!(space(&mut self.s));
697 try!(self.end()); // end the head-ibox
698
699 try!(self.word_space("="));
700 try!(self.print_expr(&expr));
701 try!(word(&mut self.s, ";"));
702 try!(self.end()); // end the outer cbox
703 }
704 hir::ItemFn(ref decl, unsafety, constness, abi, ref typarams, ref body) => {
705 try!(self.head(""));
706 try!(self.print_fn(decl,
707 unsafety,
708 constness,
709 abi,
710 Some(item.name),
711 typarams,
712 None,
713 item.vis));
714 try!(word(&mut self.s, " "));
715 try!(self.print_block_with_attrs(&body, &item.attrs));
716 }
717 hir::ItemMod(ref _mod) => {
718 try!(self.head(&visibility_qualified(item.vis, "mod")));
719 try!(self.print_name(item.name));
720 try!(self.nbsp());
721 try!(self.bopen());
722 try!(self.print_mod(_mod, &item.attrs));
723 try!(self.bclose(item.span));
724 }
725 hir::ItemForeignMod(ref nmod) => {
726 try!(self.head("extern"));
727 try!(self.word_nbsp(&nmod.abi.to_string()));
728 try!(self.bopen());
729 try!(self.print_foreign_mod(nmod, &item.attrs));
730 try!(self.bclose(item.span));
731 }
732 hir::ItemTy(ref ty, ref params) => {
733 try!(self.ibox(indent_unit));
734 try!(self.ibox(0));
735 try!(self.word_nbsp(&visibility_qualified(item.vis, "type")));
736 try!(self.print_name(item.name));
737 try!(self.print_generics(params));
738 try!(self.end()); // end the inner ibox
739
740 try!(self.print_where_clause(&params.where_clause));
741 try!(space(&mut self.s));
742 try!(self.word_space("="));
743 try!(self.print_type(&ty));
744 try!(word(&mut self.s, ";"));
745 try!(self.end()); // end the outer ibox
746 }
747 hir::ItemEnum(ref enum_definition, ref params) => {
748 try!(self.print_enum_def(enum_definition, params, item.name, item.span, item.vis));
749 }
750 hir::ItemStruct(ref struct_def, ref generics) => {
751 try!(self.head(&visibility_qualified(item.vis, "struct")));
752 try!(self.print_struct(struct_def, generics, item.name, item.span, true));
753 }
754
755 hir::ItemDefaultImpl(unsafety, ref trait_ref) => {
756 try!(self.head(""));
757 try!(self.print_visibility(item.vis));
758 try!(self.print_unsafety(unsafety));
759 try!(self.word_nbsp("impl"));
760 try!(self.print_trait_ref(trait_ref));
761 try!(space(&mut self.s));
762 try!(self.word_space("for"));
763 try!(self.word_space(".."));
764 try!(self.bopen());
765 try!(self.bclose(item.span));
766 }
767 hir::ItemImpl(unsafety,
768 polarity,
769 ref generics,
770 ref opt_trait,
771 ref ty,
772 ref impl_items) => {
773 try!(self.head(""));
774 try!(self.print_visibility(item.vis));
775 try!(self.print_unsafety(unsafety));
776 try!(self.word_nbsp("impl"));
777
778 if generics.is_parameterized() {
779 try!(self.print_generics(generics));
780 try!(space(&mut self.s));
781 }
782
783 match polarity {
784 hir::ImplPolarity::Negative => {
785 try!(word(&mut self.s, "!"));
786 }
787 _ => {}
788 }
789
790 match opt_trait {
791 &Some(ref t) => {
792 try!(self.print_trait_ref(t));
793 try!(space(&mut self.s));
794 try!(self.word_space("for"));
795 }
796 &None => {}
797 }
798
799 try!(self.print_type(&ty));
800 try!(self.print_where_clause(&generics.where_clause));
801
802 try!(space(&mut self.s));
803 try!(self.bopen());
804 try!(self.print_inner_attributes(&item.attrs));
805 for impl_item in impl_items {
806 try!(self.print_impl_item(impl_item));
807 }
808 try!(self.bclose(item.span));
809 }
810 hir::ItemTrait(unsafety, ref generics, ref bounds, ref trait_items) => {
811 try!(self.head(""));
812 try!(self.print_visibility(item.vis));
813 try!(self.print_unsafety(unsafety));
814 try!(self.word_nbsp("trait"));
815 try!(self.print_name(item.name));
816 try!(self.print_generics(generics));
817 let mut real_bounds = Vec::with_capacity(bounds.len());
818 for b in bounds.iter() {
819 if let TraitTyParamBound(ref ptr, hir::TraitBoundModifier::Maybe) = *b {
820 try!(space(&mut self.s));
821 try!(self.word_space("for ?"));
822 try!(self.print_trait_ref(&ptr.trait_ref));
823 } else {
824 real_bounds.push(b.clone());
825 }
826 }
827 try!(self.print_bounds(":", &real_bounds[..]));
828 try!(self.print_where_clause(&generics.where_clause));
829 try!(word(&mut self.s, " "));
830 try!(self.bopen());
831 for trait_item in trait_items {
832 try!(self.print_trait_item(trait_item));
833 }
834 try!(self.bclose(item.span));
835 }
836 }
837 self.ann.post(self, NodeItem(item))
838 }
839
840 fn print_trait_ref(&mut self, t: &hir::TraitRef) -> io::Result<()> {
841 self.print_path(&t.path, false, 0)
842 }
843
844 fn print_formal_lifetime_list(&mut self, lifetimes: &[hir::LifetimeDef]) -> io::Result<()> {
845 if !lifetimes.is_empty() {
846 try!(word(&mut self.s, "for<"));
847 let mut comma = false;
848 for lifetime_def in lifetimes {
849 if comma {
850 try!(self.word_space(","))
851 }
852 try!(self.print_lifetime_def(lifetime_def));
853 comma = true;
854 }
855 try!(word(&mut self.s, ">"));
856 }
857 Ok(())
858 }
859
860 fn print_poly_trait_ref(&mut self, t: &hir::PolyTraitRef) -> io::Result<()> {
861 try!(self.print_formal_lifetime_list(&t.bound_lifetimes));
862 self.print_trait_ref(&t.trait_ref)
863 }
864
865 pub fn print_enum_def(&mut self,
866 enum_definition: &hir::EnumDef,
867 generics: &hir::Generics,
868 name: ast::Name,
869 span: codemap::Span,
870 visibility: hir::Visibility)
871 -> io::Result<()> {
872 try!(self.head(&visibility_qualified(visibility, "enum")));
873 try!(self.print_name(name));
874 try!(self.print_generics(generics));
875 try!(self.print_where_clause(&generics.where_clause));
876 try!(space(&mut self.s));
877 self.print_variants(&enum_definition.variants, span)
878 }
879
880 pub fn print_variants(&mut self,
881 variants: &[hir::Variant],
882 span: codemap::Span)
883 -> io::Result<()> {
884 try!(self.bopen());
885 for v in variants {
886 try!(self.space_if_not_bol());
887 try!(self.maybe_print_comment(v.span.lo));
888 try!(self.print_outer_attributes(&v.node.attrs));
889 try!(self.ibox(indent_unit));
890 try!(self.print_variant(v));
891 try!(word(&mut self.s, ","));
892 try!(self.end());
893 try!(self.maybe_print_trailing_comment(v.span, None));
894 }
895 self.bclose(span)
896 }
897
898 pub fn print_visibility(&mut self, vis: hir::Visibility) -> io::Result<()> {
899 match vis {
900 hir::Public => self.word_nbsp("pub"),
901 hir::Inherited => Ok(()),
902 }
903 }
904
905 pub fn print_struct(&mut self,
906 struct_def: &hir::VariantData,
907 generics: &hir::Generics,
908 name: ast::Name,
909 span: codemap::Span,
910 print_finalizer: bool)
911 -> io::Result<()> {
912 try!(self.print_name(name));
913 try!(self.print_generics(generics));
914 if !struct_def.is_struct() {
915 if struct_def.is_tuple() {
916 try!(self.popen());
917 try!(self.commasep(Inconsistent, struct_def.fields(), |s, field| {
918 match field.node.kind {
919 hir::NamedField(..) => panic!("unexpected named field"),
920 hir::UnnamedField(vis) => {
921 try!(s.print_visibility(vis));
922 try!(s.maybe_print_comment(field.span.lo));
923 s.print_type(&field.node.ty)
924 }
925 }
926 }));
927 try!(self.pclose());
928 }
929 try!(self.print_where_clause(&generics.where_clause));
930 if print_finalizer {
931 try!(word(&mut self.s, ";"));
932 }
933 try!(self.end());
934 self.end() // close the outer-box
935 } else {
936 try!(self.print_where_clause(&generics.where_clause));
937 try!(self.nbsp());
938 try!(self.bopen());
939 try!(self.hardbreak_if_not_bol());
940
941 for field in struct_def.fields() {
942 match field.node.kind {
943 hir::UnnamedField(..) => panic!("unexpected unnamed field"),
944 hir::NamedField(name, visibility) => {
945 try!(self.hardbreak_if_not_bol());
946 try!(self.maybe_print_comment(field.span.lo));
947 try!(self.print_outer_attributes(&field.node.attrs));
948 try!(self.print_visibility(visibility));
949 try!(self.print_name(name));
950 try!(self.word_nbsp(":"));
951 try!(self.print_type(&field.node.ty));
952 try!(word(&mut self.s, ","));
953 }
954 }
955 }
956
957 self.bclose(span)
958 }
959 }
960
961 pub fn print_variant(&mut self, v: &hir::Variant) -> io::Result<()> {
962 try!(self.head(""));
963 let generics = ::util::empty_generics();
964 try!(self.print_struct(&v.node.data, &generics, v.node.name, v.span, false));
965 match v.node.disr_expr {
966 Some(ref d) => {
967 try!(space(&mut self.s));
968 try!(self.word_space("="));
969 self.print_expr(&d)
970 }
971 _ => Ok(()),
972 }
973 }
974 pub fn print_method_sig(&mut self,
975 name: ast::Name,
976 m: &hir::MethodSig,
977 vis: hir::Visibility)
978 -> io::Result<()> {
979 self.print_fn(&m.decl,
980 m.unsafety,
981 m.constness,
982 m.abi,
983 Some(name),
984 &m.generics,
985 Some(&m.explicit_self.node),
986 vis)
987 }
988
989 pub fn print_trait_item(&mut self, ti: &hir::TraitItem) -> io::Result<()> {
990 try!(self.ann.pre(self, NodeSubItem(ti.id)));
991 try!(self.hardbreak_if_not_bol());
992 try!(self.maybe_print_comment(ti.span.lo));
993 try!(self.print_outer_attributes(&ti.attrs));
994 match ti.node {
995 hir::ConstTraitItem(ref ty, ref default) => {
996 try!(self.print_associated_const(ti.name,
997 &ty,
998 default.as_ref().map(|expr| &**expr),
999 hir::Inherited));
1000 }
1001 hir::MethodTraitItem(ref sig, ref body) => {
1002 if body.is_some() {
1003 try!(self.head(""));
1004 }
1005 try!(self.print_method_sig(ti.name, sig, hir::Inherited));
1006 if let Some(ref body) = *body {
1007 try!(self.nbsp());
1008 try!(self.print_block_with_attrs(body, &ti.attrs));
1009 } else {
1010 try!(word(&mut self.s, ";"));
1011 }
1012 }
1013 hir::TypeTraitItem(ref bounds, ref default) => {
1014 try!(self.print_associated_type(ti.name,
1015 Some(bounds),
1016 default.as_ref().map(|ty| &**ty)));
1017 }
1018 }
1019 self.ann.post(self, NodeSubItem(ti.id))
1020 }
1021
1022 pub fn print_impl_item(&mut self, ii: &hir::ImplItem) -> io::Result<()> {
1023 try!(self.ann.pre(self, NodeSubItem(ii.id)));
1024 try!(self.hardbreak_if_not_bol());
1025 try!(self.maybe_print_comment(ii.span.lo));
1026 try!(self.print_outer_attributes(&ii.attrs));
1027 match ii.node {
1028 hir::ImplItemKind::Const(ref ty, ref expr) => {
1029 try!(self.print_associated_const(ii.name, &ty, Some(&expr), ii.vis));
1030 }
1031 hir::ImplItemKind::Method(ref sig, ref body) => {
1032 try!(self.head(""));
1033 try!(self.print_method_sig(ii.name, sig, ii.vis));
1034 try!(self.nbsp());
1035 try!(self.print_block_with_attrs(body, &ii.attrs));
1036 }
1037 hir::ImplItemKind::Type(ref ty) => {
1038 try!(self.print_associated_type(ii.name, None, Some(ty)));
1039 }
1040 }
1041 self.ann.post(self, NodeSubItem(ii.id))
1042 }
1043
1044 pub fn print_stmt(&mut self, st: &hir::Stmt) -> io::Result<()> {
1045 try!(self.maybe_print_comment(st.span.lo));
1046 match st.node {
1047 hir::StmtDecl(ref decl, _) => {
1048 try!(self.print_decl(&decl));
1049 }
1050 hir::StmtExpr(ref expr, _) => {
1051 try!(self.space_if_not_bol());
1052 try!(self.print_expr(&expr));
1053 }
1054 hir::StmtSemi(ref expr, _) => {
1055 try!(self.space_if_not_bol());
1056 try!(self.print_expr(&expr));
1057 try!(word(&mut self.s, ";"));
1058 }
1059 }
1060 if stmt_ends_with_semi(&st.node) {
1061 try!(word(&mut self.s, ";"));
1062 }
1063 self.maybe_print_trailing_comment(st.span, None)
1064 }
1065
1066 pub fn print_block(&mut self, blk: &hir::Block) -> io::Result<()> {
1067 self.print_block_with_attrs(blk, &[])
1068 }
1069
1070 pub fn print_block_unclosed(&mut self, blk: &hir::Block) -> io::Result<()> {
1071 self.print_block_unclosed_indent(blk, indent_unit)
1072 }
1073
1074 pub fn print_block_unclosed_indent(&mut self,
1075 blk: &hir::Block,
1076 indented: usize)
1077 -> io::Result<()> {
1078 self.print_block_maybe_unclosed(blk, indented, &[], false)
1079 }
1080
1081 pub fn print_block_with_attrs(&mut self,
1082 blk: &hir::Block,
1083 attrs: &[ast::Attribute])
1084 -> io::Result<()> {
1085 self.print_block_maybe_unclosed(blk, indent_unit, attrs, true)
1086 }
1087
1088 pub fn print_block_maybe_unclosed(&mut self,
1089 blk: &hir::Block,
1090 indented: usize,
1091 attrs: &[ast::Attribute],
1092 close_box: bool)
1093 -> io::Result<()> {
1094 match blk.rules {
1095 hir::UnsafeBlock(..) => try!(self.word_space("unsafe")),
1096 hir::PushUnsafeBlock(..) => try!(self.word_space("push_unsafe")),
1097 hir::PopUnsafeBlock(..) => try!(self.word_space("pop_unsafe")),
1098 hir::PushUnstableBlock => try!(self.word_space("push_unstable")),
1099 hir::PopUnstableBlock => try!(self.word_space("pop_unstable")),
1100 hir::DefaultBlock => (),
1101 }
1102 try!(self.maybe_print_comment(blk.span.lo));
1103 try!(self.ann.pre(self, NodeBlock(blk)));
1104 try!(self.bopen());
1105
1106 try!(self.print_inner_attributes(attrs));
1107
1108 for st in &blk.stmts {
1109 try!(self.print_stmt(st));
1110 }
1111 match blk.expr {
1112 Some(ref expr) => {
1113 try!(self.space_if_not_bol());
1114 try!(self.print_expr(&expr));
1115 try!(self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi)));
1116 }
1117 _ => (),
1118 }
1119 try!(self.bclose_maybe_open(blk.span, indented, close_box));
1120 self.ann.post(self, NodeBlock(blk))
1121 }
1122
1123 fn print_else(&mut self, els: Option<&hir::Expr>) -> io::Result<()> {
1124 match els {
1125 Some(_else) => {
1126 match _else.node {
1127 // "another else-if"
1128 hir::ExprIf(ref i, ref then, ref e) => {
1129 try!(self.cbox(indent_unit - 1));
1130 try!(self.ibox(0));
1131 try!(word(&mut self.s, " else if "));
1132 try!(self.print_expr(&i));
1133 try!(space(&mut self.s));
1134 try!(self.print_block(&then));
1135 self.print_else(e.as_ref().map(|e| &**e))
1136 }
1137 // "final else"
1138 hir::ExprBlock(ref b) => {
1139 try!(self.cbox(indent_unit - 1));
1140 try!(self.ibox(0));
1141 try!(word(&mut self.s, " else "));
1142 self.print_block(&b)
1143 }
1144 // BLEAH, constraints would be great here
1145 _ => {
1146 panic!("print_if saw if with weird alternative");
1147 }
1148 }
1149 }
1150 _ => Ok(()),
1151 }
1152 }
1153
1154 pub fn print_if(&mut self,
1155 test: &hir::Expr,
1156 blk: &hir::Block,
1157 elseopt: Option<&hir::Expr>)
1158 -> io::Result<()> {
1159 try!(self.head("if"));
1160 try!(self.print_expr(test));
1161 try!(space(&mut self.s));
1162 try!(self.print_block(blk));
1163 self.print_else(elseopt)
1164 }
1165
1166 pub fn print_if_let(&mut self,
1167 pat: &hir::Pat,
1168 expr: &hir::Expr,
1169 blk: &hir::Block,
1170 elseopt: Option<&hir::Expr>)
1171 -> io::Result<()> {
1172 try!(self.head("if let"));
1173 try!(self.print_pat(pat));
1174 try!(space(&mut self.s));
1175 try!(self.word_space("="));
1176 try!(self.print_expr(expr));
1177 try!(space(&mut self.s));
1178 try!(self.print_block(blk));
1179 self.print_else(elseopt)
1180 }
1181
1182
1183 fn print_call_post(&mut self, args: &[P<hir::Expr>]) -> io::Result<()> {
1184 try!(self.popen());
1185 try!(self.commasep_exprs(Inconsistent, args));
1186 self.pclose()
1187 }
1188
1189 pub fn print_expr_maybe_paren(&mut self, expr: &hir::Expr) -> io::Result<()> {
1190 let needs_par = needs_parentheses(expr);
1191 if needs_par {
1192 try!(self.popen());
1193 }
1194 try!(self.print_expr(expr));
1195 if needs_par {
1196 try!(self.pclose());
1197 }
1198 Ok(())
1199 }
1200
1201 fn print_expr_vec(&mut self, exprs: &[P<hir::Expr>]) -> io::Result<()> {
1202 try!(self.ibox(indent_unit));
1203 try!(word(&mut self.s, "["));
1204 try!(self.commasep_exprs(Inconsistent, &exprs[..]));
1205 try!(word(&mut self.s, "]"));
1206 self.end()
1207 }
1208
1209 fn print_expr_repeat(&mut self, element: &hir::Expr, count: &hir::Expr) -> io::Result<()> {
1210 try!(self.ibox(indent_unit));
1211 try!(word(&mut self.s, "["));
1212 try!(self.print_expr(element));
1213 try!(self.word_space(";"));
1214 try!(self.print_expr(count));
1215 try!(word(&mut self.s, "]"));
1216 self.end()
1217 }
1218
1219 fn print_expr_struct(&mut self,
1220 path: &hir::Path,
1221 fields: &[hir::Field],
1222 wth: &Option<P<hir::Expr>>)
1223 -> io::Result<()> {
1224 try!(self.print_path(path, true, 0));
1225 try!(word(&mut self.s, "{"));
1226 try!(self.commasep_cmnt(Consistent,
1227 &fields[..],
1228 |s, field| {
1229 try!(s.ibox(indent_unit));
1230 try!(s.print_name(field.name.node));
1231 try!(s.word_space(":"));
1232 try!(s.print_expr(&field.expr));
1233 s.end()
1234 },
1235 |f| f.span));
1236 match *wth {
1237 Some(ref expr) => {
1238 try!(self.ibox(indent_unit));
1239 if !fields.is_empty() {
1240 try!(word(&mut self.s, ","));
1241 try!(space(&mut self.s));
1242 }
1243 try!(word(&mut self.s, ".."));
1244 try!(self.print_expr(&expr));
1245 try!(self.end());
1246 }
1247 _ => if !fields.is_empty() {
1248 try!(word(&mut self.s, ","))
1249 },
1250 }
1251 try!(word(&mut self.s, "}"));
1252 Ok(())
1253 }
1254
1255 fn print_expr_tup(&mut self, exprs: &[P<hir::Expr>]) -> io::Result<()> {
1256 try!(self.popen());
1257 try!(self.commasep_exprs(Inconsistent, &exprs[..]));
1258 if exprs.len() == 1 {
1259 try!(word(&mut self.s, ","));
1260 }
1261 self.pclose()
1262 }
1263
1264 fn print_expr_call(&mut self, func: &hir::Expr, args: &[P<hir::Expr>]) -> io::Result<()> {
1265 try!(self.print_expr_maybe_paren(func));
1266 self.print_call_post(args)
1267 }
1268
1269 fn print_expr_method_call(&mut self,
1270 name: Spanned<ast::Name>,
1271 tys: &[P<hir::Ty>],
1272 args: &[P<hir::Expr>])
1273 -> io::Result<()> {
1274 let base_args = &args[1..];
1275 try!(self.print_expr(&args[0]));
1276 try!(word(&mut self.s, "."));
1277 try!(self.print_name(name.node));
1278 if !tys.is_empty() {
1279 try!(word(&mut self.s, "::<"));
1280 try!(self.commasep(Inconsistent, tys, |s, ty| s.print_type(&ty)));
1281 try!(word(&mut self.s, ">"));
1282 }
1283 self.print_call_post(base_args)
1284 }
1285
1286 fn print_expr_binary(&mut self,
1287 op: hir::BinOp,
1288 lhs: &hir::Expr,
1289 rhs: &hir::Expr)
1290 -> io::Result<()> {
1291 try!(self.print_expr(lhs));
1292 try!(space(&mut self.s));
1293 try!(self.word_space(::util::binop_to_string(op.node)));
1294 self.print_expr(rhs)
1295 }
1296
1297 fn print_expr_unary(&mut self, op: hir::UnOp, expr: &hir::Expr) -> io::Result<()> {
1298 try!(word(&mut self.s, ::util::unop_to_string(op)));
1299 self.print_expr_maybe_paren(expr)
1300 }
1301
1302 fn print_expr_addr_of(&mut self,
1303 mutability: hir::Mutability,
1304 expr: &hir::Expr)
1305 -> io::Result<()> {
1306 try!(word(&mut self.s, "&"));
1307 try!(self.print_mutability(mutability));
1308 self.print_expr_maybe_paren(expr)
1309 }
1310
1311 pub fn print_expr(&mut self, expr: &hir::Expr) -> io::Result<()> {
1312 try!(self.maybe_print_comment(expr.span.lo));
1313 try!(self.ibox(indent_unit));
1314 try!(self.ann.pre(self, NodeExpr(expr)));
1315 match expr.node {
1316 hir::ExprBox(ref expr) => {
1317 try!(self.word_space("box"));
1318 try!(self.print_expr(expr));
1319 }
1320 hir::ExprVec(ref exprs) => {
1321 try!(self.print_expr_vec(&exprs[..]));
1322 }
1323 hir::ExprRepeat(ref element, ref count) => {
1324 try!(self.print_expr_repeat(&element, &count));
1325 }
1326 hir::ExprStruct(ref path, ref fields, ref wth) => {
1327 try!(self.print_expr_struct(path, &fields[..], wth));
1328 }
1329 hir::ExprTup(ref exprs) => {
1330 try!(self.print_expr_tup(&exprs[..]));
1331 }
1332 hir::ExprCall(ref func, ref args) => {
1333 try!(self.print_expr_call(&func, &args[..]));
1334 }
1335 hir::ExprMethodCall(name, ref tys, ref args) => {
1336 try!(self.print_expr_method_call(name, &tys[..], &args[..]));
1337 }
1338 hir::ExprBinary(op, ref lhs, ref rhs) => {
1339 try!(self.print_expr_binary(op, &lhs, &rhs));
1340 }
1341 hir::ExprUnary(op, ref expr) => {
1342 try!(self.print_expr_unary(op, &expr));
1343 }
1344 hir::ExprAddrOf(m, ref expr) => {
1345 try!(self.print_expr_addr_of(m, &expr));
1346 }
1347 hir::ExprLit(ref lit) => {
1348 try!(self.print_literal(&lit));
1349 }
1350 hir::ExprCast(ref expr, ref ty) => {
1351 try!(self.print_expr(&expr));
1352 try!(space(&mut self.s));
1353 try!(self.word_space("as"));
1354 try!(self.print_type(&ty));
1355 }
1356 hir::ExprType(ref expr, ref ty) => {
1357 try!(self.print_expr(&expr));
1358 try!(self.word_space(":"));
1359 try!(self.print_type(&ty));
1360 }
1361 hir::ExprIf(ref test, ref blk, ref elseopt) => {
1362 try!(self.print_if(&test, &blk, elseopt.as_ref().map(|e| &**e)));
1363 }
1364 hir::ExprWhile(ref test, ref blk, opt_ident) => {
1365 if let Some(ident) = opt_ident {
1366 try!(self.print_name(ident.name));
1367 try!(self.word_space(":"));
1368 }
1369 try!(self.head("while"));
1370 try!(self.print_expr(&test));
1371 try!(space(&mut self.s));
1372 try!(self.print_block(&blk));
1373 }
1374 hir::ExprLoop(ref blk, opt_ident) => {
1375 if let Some(ident) = opt_ident {
1376 try!(self.print_name(ident.name));
1377 try!(self.word_space(":"));
1378 }
1379 try!(self.head("loop"));
1380 try!(space(&mut self.s));
1381 try!(self.print_block(&blk));
1382 }
1383 hir::ExprMatch(ref expr, ref arms, _) => {
1384 try!(self.cbox(indent_unit));
1385 try!(self.ibox(4));
1386 try!(self.word_nbsp("match"));
1387 try!(self.print_expr(&expr));
1388 try!(space(&mut self.s));
1389 try!(self.bopen());
1390 for arm in arms {
1391 try!(self.print_arm(arm));
1392 }
1393 try!(self.bclose_(expr.span, indent_unit));
1394 }
1395 hir::ExprClosure(capture_clause, ref decl, ref body) => {
1396 try!(self.print_capture_clause(capture_clause));
1397
1398 try!(self.print_fn_block_args(&decl));
1399 try!(space(&mut self.s));
1400
1401 let default_return = match decl.output {
1402 hir::DefaultReturn(..) => true,
1403 _ => false,
1404 };
1405
1406 if !default_return || !body.stmts.is_empty() || body.expr.is_none() {
1407 try!(self.print_block_unclosed(&body));
1408 } else {
1409 // we extract the block, so as not to create another set of boxes
1410 match body.expr.as_ref().unwrap().node {
1411 hir::ExprBlock(ref blk) => {
1412 try!(self.print_block_unclosed(&blk));
1413 }
1414 _ => {
1415 // this is a bare expression
1416 try!(self.print_expr(body.expr.as_ref().map(|e| &**e).unwrap()));
1417 try!(self.end()); // need to close a box
1418 }
1419 }
1420 }
1421 // a box will be closed by print_expr, but we didn't want an overall
1422 // wrapper so we closed the corresponding opening. so create an
1423 // empty box to satisfy the close.
1424 try!(self.ibox(0));
1425 }
1426 hir::ExprBlock(ref blk) => {
1427 // containing cbox, will be closed by print-block at }
1428 try!(self.cbox(indent_unit));
1429 // head-box, will be closed by print-block after {
1430 try!(self.ibox(0));
1431 try!(self.print_block(&blk));
1432 }
1433 hir::ExprAssign(ref lhs, ref rhs) => {
1434 try!(self.print_expr(&lhs));
1435 try!(space(&mut self.s));
1436 try!(self.word_space("="));
1437 try!(self.print_expr(&rhs));
1438 }
1439 hir::ExprAssignOp(op, ref lhs, ref rhs) => {
1440 try!(self.print_expr(&lhs));
1441 try!(space(&mut self.s));
1442 try!(word(&mut self.s, ::util::binop_to_string(op.node)));
1443 try!(self.word_space("="));
1444 try!(self.print_expr(&rhs));
1445 }
1446 hir::ExprField(ref expr, name) => {
1447 try!(self.print_expr(&expr));
1448 try!(word(&mut self.s, "."));
1449 try!(self.print_name(name.node));
1450 }
1451 hir::ExprTupField(ref expr, id) => {
1452 try!(self.print_expr(&expr));
1453 try!(word(&mut self.s, "."));
1454 try!(self.print_usize(id.node));
1455 }
1456 hir::ExprIndex(ref expr, ref index) => {
1457 try!(self.print_expr(&expr));
1458 try!(word(&mut self.s, "["));
1459 try!(self.print_expr(&index));
1460 try!(word(&mut self.s, "]"));
1461 }
1462 hir::ExprRange(ref start, ref end) => {
1463 if let &Some(ref e) = start {
1464 try!(self.print_expr(&e));
1465 }
1466 try!(word(&mut self.s, ".."));
1467 if let &Some(ref e) = end {
1468 try!(self.print_expr(&e));
1469 }
1470 }
1471 hir::ExprPath(None, ref path) => {
1472 try!(self.print_path(path, true, 0))
1473 }
1474 hir::ExprPath(Some(ref qself), ref path) => {
1475 try!(self.print_qpath(path, qself, true))
1476 }
1477 hir::ExprBreak(opt_ident) => {
1478 try!(word(&mut self.s, "break"));
1479 try!(space(&mut self.s));
1480 if let Some(ident) = opt_ident {
1481 try!(self.print_name(ident.node.name));
1482 try!(space(&mut self.s));
1483 }
1484 }
1485 hir::ExprAgain(opt_ident) => {
1486 try!(word(&mut self.s, "continue"));
1487 try!(space(&mut self.s));
1488 if let Some(ident) = opt_ident {
1489 try!(self.print_name(ident.node.name));
1490 try!(space(&mut self.s))
1491 }
1492 }
1493 hir::ExprRet(ref result) => {
1494 try!(word(&mut self.s, "return"));
1495 match *result {
1496 Some(ref expr) => {
1497 try!(word(&mut self.s, " "));
1498 try!(self.print_expr(&expr));
1499 }
1500 _ => (),
1501 }
1502 }
1503 hir::ExprInlineAsm(ref a) => {
1504 try!(word(&mut self.s, "asm!"));
1505 try!(self.popen());
1506 try!(self.print_string(&a.asm, a.asm_str_style));
1507 try!(self.word_space(":"));
1508
1509 try!(self.commasep(Inconsistent, &a.outputs, |s, out| {
1510 match out.constraint.slice_shift_char() {
1511 Some(('=', operand)) if out.is_rw => {
1512 try!(s.print_string(&format!("+{}", operand), ast::StrStyle::Cooked))
1513 }
1514 _ => try!(s.print_string(&out.constraint, ast::StrStyle::Cooked)),
1515 }
1516 try!(s.popen());
1517 try!(s.print_expr(&out.expr));
1518 try!(s.pclose());
1519 Ok(())
1520 }));
1521 try!(space(&mut self.s));
1522 try!(self.word_space(":"));
1523
1524 try!(self.commasep(Inconsistent, &a.inputs, |s, &(ref co, ref o)| {
1525 try!(s.print_string(&co, ast::StrStyle::Cooked));
1526 try!(s.popen());
1527 try!(s.print_expr(&o));
1528 try!(s.pclose());
1529 Ok(())
1530 }));
1531 try!(space(&mut self.s));
1532 try!(self.word_space(":"));
1533
1534 try!(self.commasep(Inconsistent, &a.clobbers, |s, co| {
1535 try!(s.print_string(&co, ast::StrStyle::Cooked));
1536 Ok(())
1537 }));
1538
1539 let mut options = vec![];
1540 if a.volatile {
1541 options.push("volatile");
1542 }
1543 if a.alignstack {
1544 options.push("alignstack");
1545 }
1546 if a.dialect == ast::AsmDialect::Intel {
1547 options.push("intel");
1548 }
1549
1550 if !options.is_empty() {
1551 try!(space(&mut self.s));
1552 try!(self.word_space(":"));
1553 try!(self.commasep(Inconsistent, &options, |s, &co| {
1554 try!(s.print_string(co, ast::StrStyle::Cooked));
1555 Ok(())
1556 }));
1557 }
1558
1559 try!(self.pclose());
1560 }
1561 }
1562 try!(self.ann.post(self, NodeExpr(expr)));
1563 self.end()
1564 }
1565
1566 pub fn print_local_decl(&mut self, loc: &hir::Local) -> io::Result<()> {
1567 try!(self.print_pat(&loc.pat));
1568 if let Some(ref ty) = loc.ty {
1569 try!(self.word_space(":"));
1570 try!(self.print_type(&ty));
1571 }
1572 Ok(())
1573 }
1574
1575 pub fn print_decl(&mut self, decl: &hir::Decl) -> io::Result<()> {
1576 try!(self.maybe_print_comment(decl.span.lo));
1577 match decl.node {
1578 hir::DeclLocal(ref loc) => {
1579 try!(self.space_if_not_bol());
1580 try!(self.ibox(indent_unit));
1581 try!(self.word_nbsp("let"));
1582
1583 try!(self.ibox(indent_unit));
1584 try!(self.print_local_decl(&loc));
1585 try!(self.end());
1586 if let Some(ref init) = loc.init {
1587 try!(self.nbsp());
1588 try!(self.word_space("="));
1589 try!(self.print_expr(&init));
1590 }
1591 self.end()
1592 }
1593 hir::DeclItem(ref item) => {
1594 self.print_item_id(item)
1595 }
1596 }
1597 }
1598
1599 pub fn print_usize(&mut self, i: usize) -> io::Result<()> {
1600 word(&mut self.s, &i.to_string())
1601 }
1602
1603 pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> {
1604 try!(word(&mut self.s, &name.as_str()));
1605 self.ann.post(self, NodeName(&name))
1606 }
1607
1608 pub fn print_for_decl(&mut self, loc: &hir::Local, coll: &hir::Expr) -> io::Result<()> {
1609 try!(self.print_local_decl(loc));
1610 try!(space(&mut self.s));
1611 try!(self.word_space("in"));
1612 self.print_expr(coll)
1613 }
1614
1615 fn print_path(&mut self,
1616 path: &hir::Path,
1617 colons_before_params: bool,
1618 depth: usize)
1619 -> io::Result<()> {
1620 try!(self.maybe_print_comment(path.span.lo));
1621
1622 let mut first = !path.global;
1623 for segment in &path.segments[..path.segments.len() - depth] {
1624 if first {
1625 first = false
1626 } else {
1627 try!(word(&mut self.s, "::"))
1628 }
1629
1630 try!(self.print_name(segment.identifier.name));
1631
1632 try!(self.print_path_parameters(&segment.parameters, colons_before_params));
1633 }
1634
1635 Ok(())
1636 }
1637
1638 fn print_qpath(&mut self,
1639 path: &hir::Path,
1640 qself: &hir::QSelf,
1641 colons_before_params: bool)
1642 -> io::Result<()> {
1643 try!(word(&mut self.s, "<"));
1644 try!(self.print_type(&qself.ty));
1645 if qself.position > 0 {
1646 try!(space(&mut self.s));
1647 try!(self.word_space("as"));
1648 let depth = path.segments.len() - qself.position;
1649 try!(self.print_path(&path, false, depth));
1650 }
1651 try!(word(&mut self.s, ">"));
1652 try!(word(&mut self.s, "::"));
1653 let item_segment = path.segments.last().unwrap();
1654 try!(self.print_name(item_segment.identifier.name));
1655 self.print_path_parameters(&item_segment.parameters, colons_before_params)
1656 }
1657
1658 fn print_path_parameters(&mut self,
1659 parameters: &hir::PathParameters,
1660 colons_before_params: bool)
1661 -> io::Result<()> {
1662 if parameters.is_empty() {
1663 return Ok(());
1664 }
1665
1666 if colons_before_params {
1667 try!(word(&mut self.s, "::"))
1668 }
1669
1670 match *parameters {
1671 hir::AngleBracketedParameters(ref data) => {
1672 try!(word(&mut self.s, "<"));
1673
1674 let mut comma = false;
1675 for lifetime in &data.lifetimes {
1676 if comma {
1677 try!(self.word_space(","))
1678 }
1679 try!(self.print_lifetime(lifetime));
1680 comma = true;
1681 }
1682
1683 if !data.types.is_empty() {
1684 if comma {
1685 try!(self.word_space(","))
1686 }
1687 try!(self.commasep(Inconsistent, &data.types, |s, ty| s.print_type(&ty)));
1688 comma = true;
1689 }
1690
1691 for binding in data.bindings.iter() {
1692 if comma {
1693 try!(self.word_space(","))
1694 }
1695 try!(self.print_name(binding.name));
1696 try!(space(&mut self.s));
1697 try!(self.word_space("="));
1698 try!(self.print_type(&binding.ty));
1699 comma = true;
1700 }
1701
1702 try!(word(&mut self.s, ">"))
1703 }
1704
1705 hir::ParenthesizedParameters(ref data) => {
1706 try!(word(&mut self.s, "("));
1707 try!(self.commasep(Inconsistent, &data.inputs, |s, ty| s.print_type(&ty)));
1708 try!(word(&mut self.s, ")"));
1709
1710 match data.output {
1711 None => {}
1712 Some(ref ty) => {
1713 try!(self.space_if_not_bol());
1714 try!(self.word_space("->"));
1715 try!(self.print_type(&ty));
1716 }
1717 }
1718 }
1719 }
1720
1721 Ok(())
1722 }
1723
1724 pub fn print_pat(&mut self, pat: &hir::Pat) -> io::Result<()> {
1725 try!(self.maybe_print_comment(pat.span.lo));
1726 try!(self.ann.pre(self, NodePat(pat)));
1727 // Pat isn't normalized, but the beauty of it
1728 // is that it doesn't matter
1729 match pat.node {
1730 PatKind::Wild => try!(word(&mut self.s, "_")),
1731 PatKind::Ident(binding_mode, ref path1, ref sub) => {
1732 match binding_mode {
1733 hir::BindByRef(mutbl) => {
1734 try!(self.word_nbsp("ref"));
1735 try!(self.print_mutability(mutbl));
1736 }
1737 hir::BindByValue(hir::MutImmutable) => {}
1738 hir::BindByValue(hir::MutMutable) => {
1739 try!(self.word_nbsp("mut"));
1740 }
1741 }
1742 try!(self.print_name(path1.node.name));
1743 match *sub {
1744 Some(ref p) => {
1745 try!(word(&mut self.s, "@"));
1746 try!(self.print_pat(&p));
1747 }
1748 None => (),
1749 }
1750 }
1751 PatKind::TupleStruct(ref path, ref args_) => {
1752 try!(self.print_path(path, true, 0));
1753 match *args_ {
1754 None => try!(word(&mut self.s, "(..)")),
1755 Some(ref args) => {
1756 try!(self.popen());
1757 try!(self.commasep(Inconsistent, &args[..], |s, p| s.print_pat(&p)));
1758 try!(self.pclose());
1759 }
1760 }
1761 }
1762 PatKind::Path(ref path) => {
1763 try!(self.print_path(path, true, 0));
1764 }
1765 PatKind::QPath(ref qself, ref path) => {
1766 try!(self.print_qpath(path, qself, false));
1767 }
1768 PatKind::Struct(ref path, ref fields, etc) => {
1769 try!(self.print_path(path, true, 0));
1770 try!(self.nbsp());
1771 try!(self.word_space("{"));
1772 try!(self.commasep_cmnt(Consistent,
1773 &fields[..],
1774 |s, f| {
1775 try!(s.cbox(indent_unit));
1776 if !f.node.is_shorthand {
1777 try!(s.print_name(f.node.name));
1778 try!(s.word_nbsp(":"));
1779 }
1780 try!(s.print_pat(&f.node.pat));
1781 s.end()
1782 },
1783 |f| f.node.pat.span));
1784 if etc {
1785 if !fields.is_empty() {
1786 try!(self.word_space(","));
1787 }
1788 try!(word(&mut self.s, ".."));
1789 }
1790 try!(space(&mut self.s));
1791 try!(word(&mut self.s, "}"));
1792 }
1793 PatKind::Tup(ref elts) => {
1794 try!(self.popen());
1795 try!(self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(&p)));
1796 if elts.len() == 1 {
1797 try!(word(&mut self.s, ","));
1798 }
1799 try!(self.pclose());
1800 }
1801 PatKind::Box(ref inner) => {
1802 try!(word(&mut self.s, "box "));
1803 try!(self.print_pat(&inner));
1804 }
1805 PatKind::Ref(ref inner, mutbl) => {
1806 try!(word(&mut self.s, "&"));
1807 if mutbl == hir::MutMutable {
1808 try!(word(&mut self.s, "mut "));
1809 }
1810 try!(self.print_pat(&inner));
1811 }
1812 PatKind::Lit(ref e) => try!(self.print_expr(&e)),
1813 PatKind::Range(ref begin, ref end) => {
1814 try!(self.print_expr(&begin));
1815 try!(space(&mut self.s));
1816 try!(word(&mut self.s, "..."));
1817 try!(self.print_expr(&end));
1818 }
1819 PatKind::Vec(ref before, ref slice, ref after) => {
1820 try!(word(&mut self.s, "["));
1821 try!(self.commasep(Inconsistent, &before[..], |s, p| s.print_pat(&p)));
1822 if let Some(ref p) = *slice {
1823 if !before.is_empty() {
1824 try!(self.word_space(","));
1825 }
1826 if p.node != PatKind::Wild {
1827 try!(self.print_pat(&p));
1828 }
1829 try!(word(&mut self.s, ".."));
1830 if !after.is_empty() {
1831 try!(self.word_space(","));
1832 }
1833 }
1834 try!(self.commasep(Inconsistent, &after[..], |s, p| s.print_pat(&p)));
1835 try!(word(&mut self.s, "]"));
1836 }
1837 }
1838 self.ann.post(self, NodePat(pat))
1839 }
1840
1841 fn print_arm(&mut self, arm: &hir::Arm) -> io::Result<()> {
1842 // I have no idea why this check is necessary, but here it
1843 // is :(
1844 if arm.attrs.is_empty() {
1845 try!(space(&mut self.s));
1846 }
1847 try!(self.cbox(indent_unit));
1848 try!(self.ibox(0));
1849 try!(self.print_outer_attributes(&arm.attrs));
1850 let mut first = true;
1851 for p in &arm.pats {
1852 if first {
1853 first = false;
1854 } else {
1855 try!(space(&mut self.s));
1856 try!(self.word_space("|"));
1857 }
1858 try!(self.print_pat(&p));
1859 }
1860 try!(space(&mut self.s));
1861 if let Some(ref e) = arm.guard {
1862 try!(self.word_space("if"));
1863 try!(self.print_expr(&e));
1864 try!(space(&mut self.s));
1865 }
1866 try!(self.word_space("=>"));
1867
1868 match arm.body.node {
1869 hir::ExprBlock(ref blk) => {
1870 // the block will close the pattern's ibox
1871 try!(self.print_block_unclosed_indent(&blk, indent_unit));
1872
1873 // If it is a user-provided unsafe block, print a comma after it
1874 if let hir::UnsafeBlock(hir::UserProvided) = blk.rules {
1875 try!(word(&mut self.s, ","));
1876 }
1877 }
1878 _ => {
1879 try!(self.end()); // close the ibox for the pattern
1880 try!(self.print_expr(&arm.body));
1881 try!(word(&mut self.s, ","));
1882 }
1883 }
1884 self.end() // close enclosing cbox
1885 }
1886
1887 // Returns whether it printed anything
1888 fn print_explicit_self(&mut self,
1889 explicit_self: &hir::ExplicitSelf_,
1890 mutbl: hir::Mutability)
1891 -> io::Result<bool> {
1892 try!(self.print_mutability(mutbl));
1893 match *explicit_self {
1894 hir::SelfStatic => {
1895 return Ok(false);
1896 }
1897 hir::SelfValue(_) => {
1898 try!(word(&mut self.s, "self"));
1899 }
1900 hir::SelfRegion(ref lt, m, _) => {
1901 try!(word(&mut self.s, "&"));
1902 try!(self.print_opt_lifetime(lt));
1903 try!(self.print_mutability(m));
1904 try!(word(&mut self.s, "self"));
1905 }
1906 hir::SelfExplicit(ref typ, _) => {
1907 try!(word(&mut self.s, "self"));
1908 try!(self.word_space(":"));
1909 try!(self.print_type(&typ));
1910 }
1911 }
1912 return Ok(true);
1913 }
1914
1915 pub fn print_fn(&mut self,
1916 decl: &hir::FnDecl,
1917 unsafety: hir::Unsafety,
1918 constness: hir::Constness,
1919 abi: Abi,
1920 name: Option<ast::Name>,
1921 generics: &hir::Generics,
1922 opt_explicit_self: Option<&hir::ExplicitSelf_>,
1923 vis: hir::Visibility)
1924 -> io::Result<()> {
1925 try!(self.print_fn_header_info(unsafety, constness, abi, vis));
1926
1927 if let Some(name) = name {
1928 try!(self.nbsp());
1929 try!(self.print_name(name));
1930 }
1931 try!(self.print_generics(generics));
1932 try!(self.print_fn_args_and_ret(decl, opt_explicit_self));
1933 self.print_where_clause(&generics.where_clause)
1934 }
1935
1936 pub fn print_fn_args(&mut self,
1937 decl: &hir::FnDecl,
1938 opt_explicit_self: Option<&hir::ExplicitSelf_>,
1939 is_closure: bool)
1940 -> io::Result<()> {
1941 // It is unfortunate to duplicate the commasep logic, but we want the
1942 // self type and the args all in the same box.
1943 try!(self.rbox(0, Inconsistent));
1944 let mut first = true;
1945 if let Some(explicit_self) = opt_explicit_self {
1946 let m = match explicit_self {
1947 &hir::SelfStatic => hir::MutImmutable,
1948 _ => match decl.inputs[0].pat.node {
1949 PatKind::Ident(hir::BindByValue(m), _, _) => m,
1950 _ => hir::MutImmutable,
1951 },
1952 };
1953 first = !try!(self.print_explicit_self(explicit_self, m));
1954 }
1955
1956 // HACK(eddyb) ignore the separately printed self argument.
1957 let args = if first {
1958 &decl.inputs[..]
1959 } else {
1960 &decl.inputs[1..]
1961 };
1962
1963 for arg in args {
1964 if first {
1965 first = false;
1966 } else {
1967 try!(self.word_space(","));
1968 }
1969 try!(self.print_arg(arg, is_closure));
1970 }
1971
1972 self.end()
1973 }
1974
1975 pub fn print_fn_args_and_ret(&mut self,
1976 decl: &hir::FnDecl,
1977 opt_explicit_self: Option<&hir::ExplicitSelf_>)
1978 -> io::Result<()> {
1979 try!(self.popen());
1980 try!(self.print_fn_args(decl, opt_explicit_self, false));
1981 if decl.variadic {
1982 try!(word(&mut self.s, ", ..."));
1983 }
1984 try!(self.pclose());
1985
1986 self.print_fn_output(decl)
1987 }
1988
1989 pub fn print_fn_block_args(&mut self, decl: &hir::FnDecl) -> io::Result<()> {
1990 try!(word(&mut self.s, "|"));
1991 try!(self.print_fn_args(decl, None, true));
1992 try!(word(&mut self.s, "|"));
1993
1994 if let hir::DefaultReturn(..) = decl.output {
1995 return Ok(());
1996 }
1997
1998 try!(self.space_if_not_bol());
1999 try!(self.word_space("->"));
2000 match decl.output {
2001 hir::Return(ref ty) => {
2002 try!(self.print_type(&ty));
2003 self.maybe_print_comment(ty.span.lo)
2004 }
2005 hir::DefaultReturn(..) => unreachable!(),
2006 hir::NoReturn(span) => {
2007 try!(self.word_nbsp("!"));
2008 self.maybe_print_comment(span.lo)
2009 }
2010 }
2011 }
2012
2013 pub fn print_capture_clause(&mut self, capture_clause: hir::CaptureClause) -> io::Result<()> {
2014 match capture_clause {
2015 hir::CaptureByValue => self.word_space("move"),
2016 hir::CaptureByRef => Ok(()),
2017 }
2018 }
2019
2020 pub fn print_bounds(&mut self, prefix: &str, bounds: &[hir::TyParamBound]) -> io::Result<()> {
2021 if !bounds.is_empty() {
2022 try!(word(&mut self.s, prefix));
2023 let mut first = true;
2024 for bound in bounds {
2025 try!(self.nbsp());
2026 if first {
2027 first = false;
2028 } else {
2029 try!(self.word_space("+"));
2030 }
2031
2032 try!(match *bound {
2033 TraitTyParamBound(ref tref, TraitBoundModifier::None) => {
2034 self.print_poly_trait_ref(tref)
2035 }
2036 TraitTyParamBound(ref tref, TraitBoundModifier::Maybe) => {
2037 try!(word(&mut self.s, "?"));
2038 self.print_poly_trait_ref(tref)
2039 }
2040 RegionTyParamBound(ref lt) => {
2041 self.print_lifetime(lt)
2042 }
2043 })
2044 }
2045 Ok(())
2046 } else {
2047 Ok(())
2048 }
2049 }
2050
2051 pub fn print_lifetime(&mut self, lifetime: &hir::Lifetime) -> io::Result<()> {
2052 self.print_name(lifetime.name)
2053 }
2054
2055 pub fn print_lifetime_def(&mut self, lifetime: &hir::LifetimeDef) -> io::Result<()> {
2056 try!(self.print_lifetime(&lifetime.lifetime));
2057 let mut sep = ":";
2058 for v in &lifetime.bounds {
2059 try!(word(&mut self.s, sep));
2060 try!(self.print_lifetime(v));
2061 sep = "+";
2062 }
2063 Ok(())
2064 }
2065
2066 pub fn print_generics(&mut self, generics: &hir::Generics) -> io::Result<()> {
2067 let total = generics.lifetimes.len() + generics.ty_params.len();
2068 if total == 0 {
2069 return Ok(());
2070 }
2071
2072 try!(word(&mut self.s, "<"));
2073
2074 let mut ints = Vec::new();
2075 for i in 0..total {
2076 ints.push(i);
2077 }
2078
2079 try!(self.commasep(Inconsistent, &ints[..], |s, &idx| {
2080 if idx < generics.lifetimes.len() {
2081 let lifetime = &generics.lifetimes[idx];
2082 s.print_lifetime_def(lifetime)
2083 } else {
2084 let idx = idx - generics.lifetimes.len();
2085 let param = &generics.ty_params[idx];
2086 s.print_ty_param(param)
2087 }
2088 }));
2089
2090 try!(word(&mut self.s, ">"));
2091 Ok(())
2092 }
2093
2094 pub fn print_ty_param(&mut self, param: &hir::TyParam) -> io::Result<()> {
2095 try!(self.print_name(param.name));
2096 try!(self.print_bounds(":", &param.bounds));
2097 match param.default {
2098 Some(ref default) => {
2099 try!(space(&mut self.s));
2100 try!(self.word_space("="));
2101 self.print_type(&default)
2102 }
2103 _ => Ok(()),
2104 }
2105 }
2106
2107 pub fn print_where_clause(&mut self, where_clause: &hir::WhereClause) -> io::Result<()> {
2108 if where_clause.predicates.is_empty() {
2109 return Ok(());
2110 }
2111
2112 try!(space(&mut self.s));
2113 try!(self.word_space("where"));
2114
2115 for (i, predicate) in where_clause.predicates.iter().enumerate() {
2116 if i != 0 {
2117 try!(self.word_space(","));
2118 }
2119
2120 match predicate {
2121 &hir::WherePredicate::BoundPredicate(hir::WhereBoundPredicate{ref bound_lifetimes,
2122 ref bounded_ty,
2123 ref bounds,
2124 ..}) => {
2125 try!(self.print_formal_lifetime_list(bound_lifetimes));
2126 try!(self.print_type(&bounded_ty));
2127 try!(self.print_bounds(":", bounds));
2128 }
2129 &hir::WherePredicate::RegionPredicate(hir::WhereRegionPredicate{ref lifetime,
2130 ref bounds,
2131 ..}) => {
2132 try!(self.print_lifetime(lifetime));
2133 try!(word(&mut self.s, ":"));
2134
2135 for (i, bound) in bounds.iter().enumerate() {
2136 try!(self.print_lifetime(bound));
2137
2138 if i != 0 {
2139 try!(word(&mut self.s, ":"));
2140 }
2141 }
2142 }
2143 &hir::WherePredicate::EqPredicate(hir::WhereEqPredicate{ref path, ref ty, ..}) => {
2144 try!(self.print_path(path, false, 0));
2145 try!(space(&mut self.s));
2146 try!(self.word_space("="));
2147 try!(self.print_type(&ty));
2148 }
2149 }
2150 }
2151
2152 Ok(())
2153 }
2154
2155 pub fn print_view_path(&mut self, vp: &hir::ViewPath) -> io::Result<()> {
2156 match vp.node {
2157 hir::ViewPathSimple(name, ref path) => {
2158 try!(self.print_path(path, false, 0));
2159
2160 if path.segments.last().unwrap().identifier.name != name {
2161 try!(space(&mut self.s));
2162 try!(self.word_space("as"));
2163 try!(self.print_name(name));
2164 }
2165
2166 Ok(())
2167 }
2168
2169 hir::ViewPathGlob(ref path) => {
2170 try!(self.print_path(path, false, 0));
2171 word(&mut self.s, "::*")
2172 }
2173
2174 hir::ViewPathList(ref path, ref segments) => {
2175 if path.segments.is_empty() {
2176 try!(word(&mut self.s, "{"));
2177 } else {
2178 try!(self.print_path(path, false, 0));
2179 try!(word(&mut self.s, "::{"));
2180 }
2181 try!(self.commasep(Inconsistent, &segments[..], |s, w| {
2182 match w.node {
2183 hir::PathListIdent { name, .. } => {
2184 s.print_name(name)
2185 }
2186 hir::PathListMod { .. } => {
2187 word(&mut s.s, "self")
2188 }
2189 }
2190 }));
2191 word(&mut self.s, "}")
2192 }
2193 }
2194 }
2195
2196 pub fn print_mutability(&mut self, mutbl: hir::Mutability) -> io::Result<()> {
2197 match mutbl {
2198 hir::MutMutable => self.word_nbsp("mut"),
2199 hir::MutImmutable => Ok(()),
2200 }
2201 }
2202
2203 pub fn print_mt(&mut self, mt: &hir::MutTy) -> io::Result<()> {
2204 try!(self.print_mutability(mt.mutbl));
2205 self.print_type(&mt.ty)
2206 }
2207
2208 pub fn print_arg(&mut self, input: &hir::Arg, is_closure: bool) -> io::Result<()> {
2209 try!(self.ibox(indent_unit));
2210 match input.ty.node {
2211 hir::TyInfer if is_closure => try!(self.print_pat(&input.pat)),
2212 _ => {
2213 match input.pat.node {
2214 PatKind::Ident(_, ref path1, _) if
2215 path1.node.name ==
2216 parse::token::special_idents::invalid.name => {
2217 // Do nothing.
2218 }
2219 _ => {
2220 try!(self.print_pat(&input.pat));
2221 try!(word(&mut self.s, ":"));
2222 try!(space(&mut self.s));
2223 }
2224 }
2225 try!(self.print_type(&input.ty));
2226 }
2227 }
2228 self.end()
2229 }
2230
2231 pub fn print_fn_output(&mut self, decl: &hir::FnDecl) -> io::Result<()> {
2232 if let hir::DefaultReturn(..) = decl.output {
2233 return Ok(());
2234 }
2235
2236 try!(self.space_if_not_bol());
2237 try!(self.ibox(indent_unit));
2238 try!(self.word_space("->"));
2239 match decl.output {
2240 hir::NoReturn(_) => try!(self.word_nbsp("!")),
2241 hir::DefaultReturn(..) => unreachable!(),
2242 hir::Return(ref ty) => try!(self.print_type(&ty)),
2243 }
2244 try!(self.end());
2245
2246 match decl.output {
2247 hir::Return(ref output) => self.maybe_print_comment(output.span.lo),
2248 _ => Ok(()),
2249 }
2250 }
2251
2252 pub fn print_ty_fn(&mut self,
2253 abi: Abi,
2254 unsafety: hir::Unsafety,
2255 decl: &hir::FnDecl,
2256 name: Option<ast::Name>,
2257 generics: &hir::Generics,
2258 opt_explicit_self: Option<&hir::ExplicitSelf_>)
2259 -> io::Result<()> {
2260 try!(self.ibox(indent_unit));
2261 if !generics.lifetimes.is_empty() || !generics.ty_params.is_empty() {
2262 try!(word(&mut self.s, "for"));
2263 try!(self.print_generics(generics));
2264 }
2265 let generics = hir::Generics {
2266 lifetimes: hir::HirVec::new(),
2267 ty_params: hir::HirVec::new(),
2268 where_clause: hir::WhereClause {
2269 id: ast::DUMMY_NODE_ID,
2270 predicates: hir::HirVec::new(),
2271 },
2272 };
2273 try!(self.print_fn(decl,
2274 unsafety,
2275 hir::Constness::NotConst,
2276 abi,
2277 name,
2278 &generics,
2279 opt_explicit_self,
2280 hir::Inherited));
2281 self.end()
2282 }
2283
2284 pub fn maybe_print_trailing_comment(&mut self,
2285 span: codemap::Span,
2286 next_pos: Option<BytePos>)
2287 -> io::Result<()> {
2288 let cm = match self.cm {
2289 Some(cm) => cm,
2290 _ => return Ok(()),
2291 };
2292 match self.next_comment() {
2293 Some(ref cmnt) => {
2294 if (*cmnt).style != comments::Trailing {
2295 return Ok(());
2296 }
2297 let span_line = cm.lookup_char_pos(span.hi);
2298 let comment_line = cm.lookup_char_pos((*cmnt).pos);
2299 let mut next = (*cmnt).pos + BytePos(1);
2300 match next_pos {
2301 None => (),
2302 Some(p) => next = p,
2303 }
2304 if span.hi < (*cmnt).pos && (*cmnt).pos < next &&
2305 span_line.line == comment_line.line {
2306 try!(self.print_comment(cmnt));
2307 self.cur_cmnt_and_lit.cur_cmnt += 1;
2308 }
2309 }
2310 _ => (),
2311 }
2312 Ok(())
2313 }
2314
2315 pub fn print_remaining_comments(&mut self) -> io::Result<()> {
2316 // If there aren't any remaining comments, then we need to manually
2317 // make sure there is a line break at the end.
2318 if self.next_comment().is_none() {
2319 try!(hardbreak(&mut self.s));
2320 }
2321 loop {
2322 match self.next_comment() {
2323 Some(ref cmnt) => {
2324 try!(self.print_comment(cmnt));
2325 self.cur_cmnt_and_lit.cur_cmnt += 1;
2326 }
2327 _ => break,
2328 }
2329 }
2330 Ok(())
2331 }
2332
2333 pub fn print_opt_abi_and_extern_if_nondefault(&mut self,
2334 opt_abi: Option<Abi>)
2335 -> io::Result<()> {
2336 match opt_abi {
2337 Some(Abi::Rust) => Ok(()),
2338 Some(abi) => {
2339 try!(self.word_nbsp("extern"));
2340 self.word_nbsp(&abi.to_string())
2341 }
2342 None => Ok(()),
2343 }
2344 }
2345
2346 pub fn print_extern_opt_abi(&mut self, opt_abi: Option<Abi>) -> io::Result<()> {
2347 match opt_abi {
2348 Some(abi) => {
2349 try!(self.word_nbsp("extern"));
2350 self.word_nbsp(&abi.to_string())
2351 }
2352 None => Ok(()),
2353 }
2354 }
2355
2356 pub fn print_fn_header_info(&mut self,
2357 unsafety: hir::Unsafety,
2358 constness: hir::Constness,
2359 abi: Abi,
2360 vis: hir::Visibility)
2361 -> io::Result<()> {
2362 try!(word(&mut self.s, &visibility_qualified(vis, "")));
2363 try!(self.print_unsafety(unsafety));
2364
2365 match constness {
2366 hir::Constness::NotConst => {}
2367 hir::Constness::Const => try!(self.word_nbsp("const")),
2368 }
2369
2370 if abi != Abi::Rust {
2371 try!(self.word_nbsp("extern"));
2372 try!(self.word_nbsp(&abi.to_string()));
2373 }
2374
2375 word(&mut self.s, "fn")
2376 }
2377
2378 pub fn print_unsafety(&mut self, s: hir::Unsafety) -> io::Result<()> {
2379 match s {
2380 hir::Unsafety::Normal => Ok(()),
2381 hir::Unsafety::Unsafe => self.word_nbsp("unsafe"),
2382 }
2383 }
2384 }
2385
2386 // Dup'ed from parse::classify, but adapted for the HIR.
2387 /// Does this expression require a semicolon to be treated
2388 /// as a statement? The negation of this: 'can this expression
2389 /// be used as a statement without a semicolon' -- is used
2390 /// as an early-bail-out in the parser so that, for instance,
2391 /// if true {...} else {...}
2392 /// |x| 5
2393 /// isn't parsed as (if true {...} else {...} | x) | 5
2394 fn expr_requires_semi_to_be_stmt(e: &hir::Expr) -> bool {
2395 match e.node {
2396 hir::ExprIf(..) |
2397 hir::ExprMatch(..) |
2398 hir::ExprBlock(_) |
2399 hir::ExprWhile(..) |
2400 hir::ExprLoop(..) => false,
2401 _ => true,
2402 }
2403 }
2404
2405 /// this statement requires a semicolon after it.
2406 /// note that in one case (stmt_semi), we've already
2407 /// seen the semicolon, and thus don't need another.
2408 fn stmt_ends_with_semi(stmt: &hir::Stmt_) -> bool {
2409 match *stmt {
2410 hir::StmtDecl(ref d, _) => {
2411 match d.node {
2412 hir::DeclLocal(_) => true,
2413 hir::DeclItem(_) => false,
2414 }
2415 }
2416 hir::StmtExpr(ref e, _) => {
2417 expr_requires_semi_to_be_stmt(&e)
2418 }
2419 hir::StmtSemi(..) => {
2420 false
2421 }
2422 }
2423 }