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.
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.
11 pub use self::AnnNode
::*;
15 use syntax
::codemap
::{self, CodeMap, BytePos, Spanned}
;
17 use syntax
::parse
::token
::{self, BinOpToken}
;
18 use syntax
::parse
::lexer
::comments
;
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}
;
27 use hir
::{Crate, PatKind, RegionTyParamBound, TraitTyParamBound, TraitBoundModifier}
;
29 use std
::io
::{self, Write, Read}
;
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
),
41 fn pre(&self, _state
: &mut State
, _node
: AnnNode
) -> io
::Result
<()> {
44 fn post(&self, _state
: &mut State
, _node
: AnnNode
) -> io
::Result
<()> {
49 #[derive(Copy, Clone)]
52 impl PpAnn
for NoAnn {}
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
),
66 impl<'a
> PrintState
<'a
> for State
<'a
> {
67 fn writer(&mut self) -> &mut pp
::Printer
<'a
> {
71 fn boxes(&mut self) -> &mut Vec
<pp
::Breaks
> {
75 fn comments(&mut self) -> &mut Option
<Vec
<comments
::Comment
>> {
79 fn cur_cmnt_and_lit(&mut self) -> &mut ast_pp
::CurrentCommentAndLiteral
{
80 &mut self.cur_cmnt_and_lit
83 fn literals(&self) -> &Option
<Vec
<comments
::Literal
>> {
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
)
93 pub fn rust_printer_annotated
<'a
>(writer
: Box
<Write
+ 'a
>,
95 krate
: Option
<&'a Crate
>)
99 s
: pp
::mk_printer(writer
, default_columns
),
103 cur_cmnt_and_lit
: ast_pp
::CurrentCommentAndLiteral
{
112 #[allow(non_upper_case_globals)]
113 pub const indent_unit
: usize = 4;
115 #[allow(non_upper_case_globals)]
116 pub const default_columns
: usize = 78;
119 /// Requires you to pass an input filename and reader so that
120 /// it can scan the input text for comments and literals to
122 pub fn print_crate
<'a
>(cm
: &'a CodeMap
,
123 span_diagnostic
: &errors
::Handler
,
127 out
: Box
<Write
+ 'a
>,
131 let mut s
= State
::new_from_input(cm
, span_diagnostic
, filename
, input
,
132 out
, ann
, is_expanded
, Some(krate
));
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.
137 try
!(s
.print_mod(&krate
.module
, &krate
.attrs
));
138 try
!(s
.print_remaining_comments());
143 pub fn new_from_input(cm
: &'a CodeMap
,
144 span_diagnostic
: &errors
::Handler
,
147 out
: Box
<Write
+ 'a
>,
150 krate
: Option
<&'a Crate
>)
152 let (cmnts
, lits
) = comments
::gather_comments_and_literals(span_diagnostic
,
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.
171 pub fn new(cm
: &'a CodeMap
,
172 out
: Box
<Write
+ 'a
>,
174 comments
: Option
<Vec
<comments
::Comment
>>,
175 literals
: Option
<Vec
<comments
::Literal
>>,
176 krate
: Option
<&'a Crate
>)
180 s
: pp
::mk_printer(out
, default_columns
),
182 comments
: comments
.clone(),
183 literals
: literals
.clone(),
184 cur_cmnt_and_lit
: ast_pp
::CurrentCommentAndLiteral
{
194 pub fn to_string
<F
>(f
: F
) -> String
195 where F
: FnOnce(&mut State
) -> io
::Result
<()>
197 let mut wr
= Vec
::new();
199 let mut printer
= rust_printer(Box
::new(&mut wr
), None
);
200 f(&mut printer
).unwrap();
201 eof(&mut printer
.s
).unwrap();
203 String
::from_utf8(wr
).unwrap()
206 pub fn binop_to_string(op
: BinOpToken
) -> &'
static str {
212 token
::Percent
=> "%",
221 pub fn ty_to_string(ty
: &hir
::Ty
) -> String
{
222 to_string(|s
| s
.print_type(ty
))
225 pub fn bounds_to_string(bounds
: &[hir
::TyParamBound
]) -> String
{
226 to_string(|s
| s
.print_bounds("", bounds
))
229 pub fn pat_to_string(pat
: &hir
::Pat
) -> String
{
230 to_string(|s
| s
.print_pat(pat
))
233 pub fn arm_to_string(arm
: &hir
::Arm
) -> String
{
234 to_string(|s
| s
.print_arm(arm
))
237 pub fn expr_to_string(e
: &hir
::Expr
) -> String
{
238 to_string(|s
| s
.print_expr(e
))
241 pub fn lifetime_to_string(e
: &hir
::Lifetime
) -> String
{
242 to_string(|s
| s
.print_lifetime(e
))
245 pub fn stmt_to_string(stmt
: &hir
::Stmt
) -> String
{
246 to_string(|s
| s
.print_stmt(stmt
))
249 pub fn item_to_string(i
: &hir
::Item
) -> String
{
250 to_string(|s
| s
.print_item(i
))
253 pub fn impl_item_to_string(i
: &hir
::ImplItem
) -> String
{
254 to_string(|s
| s
.print_impl_item(i
))
257 pub fn trait_item_to_string(i
: &hir
::TraitItem
) -> String
{
258 to_string(|s
| s
.print_trait_item(i
))
261 pub fn generics_to_string(generics
: &hir
::Generics
) -> String
{
262 to_string(|s
| s
.print_generics(generics
))
265 pub fn where_clause_to_string(i
: &hir
::WhereClause
) -> String
{
266 to_string(|s
| s
.print_where_clause(i
))
269 pub fn fn_block_to_string(p
: &hir
::FnDecl
) -> String
{
270 to_string(|s
| s
.print_fn_block_args(p
))
273 pub fn path_to_string(p
: &hir
::Path
) -> String
{
274 to_string(|s
| s
.print_path(p
, false, 0))
277 pub fn name_to_string(name
: ast
::Name
) -> String
{
278 to_string(|s
| s
.print_name(name
))
281 pub fn fun_to_string(decl
: &hir
::FnDecl
,
282 unsafety
: hir
::Unsafety
,
283 constness
: hir
::Constness
,
285 opt_explicit_self
: Option
<&hir
::ExplicitSelf_
>,
286 generics
: &hir
::Generics
)
290 try
!(s
.print_fn(decl
,
298 try
!(s
.end()); // Close the head box
299 s
.end() // Close the outer box
303 pub fn block_to_string(blk
: &hir
::Block
) -> String
{
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 {
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(|_
| {}
))
317 pub fn variant_to_string(var
: &hir
::Variant
) -> String
{
318 to_string(|s
| s
.print_variant(var
))
321 pub fn arg_to_string(arg
: &hir
::Arg
) -> String
{
322 to_string(|s
| s
.print_arg(arg
, false))
325 pub fn visibility_qualified(vis
: hir
::Visibility
, s
: &str) -> String
{
327 hir
::Public
=> format
!("pub {}", s
),
328 hir
::Inherited
=> s
.to_string(),
332 fn needs_parentheses(expr
: &hir
::Expr
) -> bool
{
334 hir
::ExprAssign(..) |
335 hir
::ExprBinary(..) |
336 hir
::ExprClosure(..) |
337 hir
::ExprAssignOp(..) |
339 hir
::ExprType(..) => true,
345 pub fn cbox(&mut self, u
: usize) -> io
::Result
<()> {
346 self.boxes
.push(pp
::Breaks
::Consistent
);
347 pp
::cbox(&mut self.s
, u
)
350 pub fn nbsp(&mut self) -> io
::Result
<()> {
351 word(&mut self.s
, " ")
354 pub fn word_nbsp(&mut self, w
: &str) -> io
::Result
<()> {
355 try
!(word(&mut self.s
, w
));
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
366 try
!(self.word_nbsp(w
));
371 pub fn bopen(&mut self) -> io
::Result
<()> {
372 try
!(word(&mut self.s
, "{"));
373 self.end() // close the head-box
376 pub fn bclose_(&mut self, span
: codemap
::Span
, indented
: usize) -> io
::Result
<()> {
377 self.bclose_maybe_open(span
, indented
, true)
379 pub fn bclose_maybe_open(&mut self,
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
, "}"));
388 try
!(self.end()); // close the outer-box
392 pub fn bclose(&mut self, span
: codemap
::Span
) -> io
::Result
<()> {
393 self.bclose_(span
, indent_unit
)
396 pub fn in_cbox(&self) -> bool
{
397 match self.boxes
.last() {
398 Some(&last_box
) => last_box
== pp
::Breaks
::Consistent
,
402 pub fn space_if_not_bol(&mut self) -> io
::Result
<()> {
404 try
!(space(&mut self.s
));
408 pub fn break_offset_if_not_bol(&mut self, n
: usize, off
: isize) -> io
::Result
<()> {
410 break_offset(&mut self.s
, n
, off
)
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
));
422 // Synthesizes a comment that was not textually present in the original source
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
, "*/")
433 pub fn commasep_cmnt
<T
, F
, G
>(&mut self,
439 where F
: FnMut(&mut State
, &T
) -> io
::Result
<()>,
440 G
: FnMut(&T
) -> codemap
::Span
442 try
!(self.rbox(0, b
));
443 let len
= elts
.len();
446 try
!(self.maybe_print_comment(get_span(elt
).hi
));
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());
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
)
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
));
470 pub fn print_foreign_mod(&mut self,
471 nmod
: &hir
::ForeignMod
,
472 attrs
: &[ast
::Attribute
])
474 try
!(self.print_inner_attributes(attrs
));
475 for item
in &nmod
.items
{
476 try
!(self.print_foreign_item(item
));
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
));
489 pub fn print_type(&mut self, ty
: &hir
::Ty
) -> io
::Result
<()> {
490 try
!(self.maybe_print_comment(ty
.span
.lo
));
493 hir
::TyVec(ref ty
) => {
494 try
!(word(&mut self.s
, "["));
495 try
!(self.print_type(&ty
));
496 try
!(word(&mut self.s
, "]"));
498 hir
::TyPtr(ref mt
) => {
499 try
!(word(&mut self.s
, "*"));
501 hir
::MutMutable
=> try
!(self.word_nbsp("mut")),
502 hir
::MutImmutable
=> try
!(self.word_nbsp("const")),
504 try
!(self.print_type(&mt
.ty
));
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
));
511 hir
::TyTup(ref elts
) => {
513 try
!(self.commasep(Inconsistent
, &elts
[..], |s
, ty
| s
.print_type(&ty
)));
515 try
!(word(&mut self.s
, ","));
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(),
528 try
!(self.print_ty_fn(f
.abi
, f
.unsafety
, &f
.decl
, None
, &generics
, None
));
530 hir
::TyPath(None
, ref path
) => {
531 try
!(self.print_path(path
, false, 0));
533 hir
::TyPath(Some(ref qself
), ref path
) => {
534 try
!(self.print_qpath(path
, qself
, false))
536 hir
::TyObjectSum(ref ty
, ref bounds
) => {
537 try
!(self.print_type(&ty
));
538 try
!(self.print_bounds("+", &bounds
[..]));
540 hir
::TyPolyTraitRef(ref bounds
) => {
541 try
!(self.print_bounds("", &bounds
[..]));
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
, "]"));
550 hir
::TyTypeof(ref e
) => {
551 try
!(word(&mut self.s
, "typeof("));
552 try
!(self.print_expr(&e
));
553 try
!(word(&mut self.s
, ")"));
556 try
!(word(&mut self.s
, "_"));
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
));
567 hir
::ForeignItemFn(ref decl
, ref generics
) => {
569 try
!(self.print_fn(decl
,
570 hir
::Unsafety
::Normal
,
571 hir
::Constness
::NotConst
,
577 try
!(self.end()); // end head-ibox
578 try
!(word(&mut self.s
, ";"));
579 self.end() // end the outer fn box
581 hir
::ForeignItemStatic(ref t
, m
) => {
582 try
!(self.head(&visibility_qualified(item
.vis
, "static")));
584 try
!(self.word_space("mut"));
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
596 fn print_associated_const(&mut self,
599 default: Option
<&hir
::Expr
>,
600 vis
: hir
::Visibility
)
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
));
612 word(&mut self.s
, ";")
615 fn print_associated_type(&mut self,
617 bounds
: Option
<&hir
::TyParamBounds
>,
618 ty
: Option
<&hir
::Ty
>)
620 try
!(self.word_space("type"));
621 try
!(self.print_name(name
));
622 if let Some(bounds
) = bounds
{
623 try
!(self.print_bounds(":", bounds
));
625 if let Some(ty
) = ty
{
626 try
!(space(&mut self.s
));
627 try
!(self.word_space("="));
628 try
!(self.print_type(ty
));
630 word(&mut self.s
, ";")
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
)
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
)));
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
));
657 try
!(self.print_name(p
));
659 try
!(space(&mut self.s
));
660 try
!(word(&mut self.s
, "as"));
661 try
!(space(&mut self.s
));
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
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
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"));
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
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
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
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
704 hir
::ItemFn(ref decl
, unsafety
, constness
, abi
, ref typarams
, ref body
) => {
706 try
!(self.print_fn(decl
,
714 try
!(word(&mut self.s
, " "));
715 try
!(self.print_block_with_attrs(&body
, &item
.attrs
));
717 hir
::ItemMod(ref _mod
) => {
718 try
!(self.head(&visibility_qualified(item
.vis
, "mod")));
719 try
!(self.print_name(item
.name
));
722 try
!(self.print_mod(_mod
, &item
.attrs
));
723 try
!(self.bclose(item
.span
));
725 hir
::ItemForeignMod(ref nmod
) => {
726 try
!(self.head("extern"));
727 try
!(self.word_nbsp(&nmod
.abi
.to_string()));
729 try
!(self.print_foreign_mod(nmod
, &item
.attrs
));
730 try
!(self.bclose(item
.span
));
732 hir
::ItemTy(ref ty
, ref params
) => {
733 try
!(self.ibox(indent_unit
));
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
740 try
!(self.print_where_clause(¶ms
.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
747 hir
::ItemEnum(ref enum_definition
, ref params
) => {
748 try
!(self.print_enum_def(enum_definition
, params
, item
.name
, item
.span
, item
.vis
));
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));
755 hir
::ItemDefaultImpl(unsafety
, ref trait_ref
) => {
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(".."));
765 try
!(self.bclose(item
.span
));
767 hir
::ItemImpl(unsafety
,
774 try
!(self.print_visibility(item
.vis
));
775 try
!(self.print_unsafety(unsafety
));
776 try
!(self.word_nbsp("impl"));
778 if generics
.is_parameterized() {
779 try
!(self.print_generics(generics
));
780 try
!(space(&mut self.s
));
784 hir
::ImplPolarity
::Negative
=> {
785 try
!(word(&mut self.s
, "!"));
792 try
!(self.print_trait_ref(t
));
793 try
!(space(&mut self.s
));
794 try
!(self.word_space("for"));
799 try
!(self.print_type(&ty
));
800 try
!(self.print_where_clause(&generics
.where_clause
));
802 try
!(space(&mut self.s
));
804 try
!(self.print_inner_attributes(&item
.attrs
));
805 for impl_item
in impl_items
{
806 try
!(self.print_impl_item(impl_item
));
808 try
!(self.bclose(item
.span
));
810 hir
::ItemTrait(unsafety
, ref generics
, ref bounds
, ref trait_items
) => {
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
));
824 real_bounds
.push(b
.clone());
827 try
!(self.print_bounds(":", &real_bounds
[..]));
828 try
!(self.print_where_clause(&generics
.where_clause
));
829 try
!(word(&mut self.s
, " "));
831 for trait_item
in trait_items
{
832 try
!(self.print_trait_item(trait_item
));
834 try
!(self.bclose(item
.span
));
837 self.ann
.post(self, NodeItem(item
))
840 fn print_trait_ref(&mut self, t
: &hir
::TraitRef
) -> io
::Result
<()> {
841 self.print_path(&t
.path
, false, 0)
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
{
850 try
!(self.word_space(","))
852 try
!(self.print_lifetime_def(lifetime_def
));
855 try
!(word(&mut self.s
, ">"));
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
)
865 pub fn print_enum_def(&mut self,
866 enum_definition
: &hir
::EnumDef
,
867 generics
: &hir
::Generics
,
870 visibility
: hir
::Visibility
)
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
)
880 pub fn print_variants(&mut self,
881 variants
: &[hir
::Variant
],
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
, ","));
893 try
!(self.maybe_print_trailing_comment(v
.span
, None
));
898 pub fn print_visibility(&mut self, vis
: hir
::Visibility
) -> io
::Result
<()> {
900 hir
::Public
=> self.word_nbsp("pub"),
901 hir
::Inherited
=> Ok(()),
905 pub fn print_struct(&mut self,
906 struct_def
: &hir
::VariantData
,
907 generics
: &hir
::Generics
,
910 print_finalizer
: bool
)
912 try
!(self.print_name(name
));
913 try
!(self.print_generics(generics
));
914 if !struct_def
.is_struct() {
915 if struct_def
.is_tuple() {
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
)
929 try
!(self.print_where_clause(&generics
.where_clause
));
931 try
!(word(&mut self.s
, ";"));
934 self.end() // close the outer-box
936 try
!(self.print_where_clause(&generics
.where_clause
));
939 try
!(self.hardbreak_if_not_bol());
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
, ","));
961 pub fn print_variant(&mut self, v
: &hir
::Variant
) -> io
::Result
<()> {
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
{
967 try
!(space(&mut self.s
));
968 try
!(self.word_space("="));
974 pub fn print_method_sig(&mut self,
977 vis
: hir
::Visibility
)
979 self.print_fn(&m
.decl
,
985 Some(&m
.explicit_self
.node
),
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
));
995 hir
::ConstTraitItem(ref ty
, ref default) => {
996 try
!(self.print_associated_const(ti
.name
,
998 default.as_ref().map(|expr
| &**expr
),
1001 hir
::MethodTraitItem(ref sig
, ref body
) => {
1003 try
!(self.head(""));
1005 try
!(self.print_method_sig(ti
.name
, sig
, hir
::Inherited
));
1006 if let Some(ref body
) = *body
{
1008 try
!(self.print_block_with_attrs(body
, &ti
.attrs
));
1010 try
!(word(&mut self.s
, ";"));
1013 hir
::TypeTraitItem(ref bounds
, ref default) => {
1014 try
!(self.print_associated_type(ti
.name
,
1016 default.as_ref().map(|ty
| &**ty
)));
1019 self.ann
.post(self, NodeSubItem(ti
.id
))
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
));
1028 hir
::ImplItemKind
::Const(ref ty
, ref expr
) => {
1029 try
!(self.print_associated_const(ii
.name
, &ty
, Some(&expr
), ii
.vis
));
1031 hir
::ImplItemKind
::Method(ref sig
, ref body
) => {
1032 try
!(self.head(""));
1033 try
!(self.print_method_sig(ii
.name
, sig
, ii
.vis
));
1035 try
!(self.print_block_with_attrs(body
, &ii
.attrs
));
1037 hir
::ImplItemKind
::Type(ref ty
) => {
1038 try
!(self.print_associated_type(ii
.name
, None
, Some(ty
)));
1041 self.ann
.post(self, NodeSubItem(ii
.id
))
1044 pub fn print_stmt(&mut self, st
: &hir
::Stmt
) -> io
::Result
<()> {
1045 try
!(self.maybe_print_comment(st
.span
.lo
));
1047 hir
::StmtDecl(ref decl
, _
) => {
1048 try
!(self.print_decl(&decl
));
1050 hir
::StmtExpr(ref expr
, _
) => {
1051 try
!(self.space_if_not_bol());
1052 try
!(self.print_expr(&expr
));
1054 hir
::StmtSemi(ref expr
, _
) => {
1055 try
!(self.space_if_not_bol());
1056 try
!(self.print_expr(&expr
));
1057 try
!(word(&mut self.s
, ";"));
1060 if stmt_ends_with_semi(&st
.node
) {
1061 try
!(word(&mut self.s
, ";"));
1063 self.maybe_print_trailing_comment(st
.span
, None
)
1066 pub fn print_block(&mut self, blk
: &hir
::Block
) -> io
::Result
<()> {
1067 self.print_block_with_attrs(blk
, &[])
1070 pub fn print_block_unclosed(&mut self, blk
: &hir
::Block
) -> io
::Result
<()> {
1071 self.print_block_unclosed_indent(blk
, indent_unit
)
1074 pub fn print_block_unclosed_indent(&mut self,
1078 self.print_block_maybe_unclosed(blk
, indented
, &[], false)
1081 pub fn print_block_with_attrs(&mut self,
1083 attrs
: &[ast
::Attribute
])
1085 self.print_block_maybe_unclosed(blk
, indent_unit
, attrs
, true)
1088 pub fn print_block_maybe_unclosed(&mut self,
1091 attrs
: &[ast
::Attribute
],
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
=> (),
1102 try
!(self.maybe_print_comment(blk
.span
.lo
));
1103 try
!(self.ann
.pre(self, NodeBlock(blk
)));
1106 try
!(self.print_inner_attributes(attrs
));
1108 for st
in &blk
.stmts
{
1109 try
!(self.print_stmt(st
));
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
)));
1119 try
!(self.bclose_maybe_open(blk
.span
, indented
, close_box
));
1120 self.ann
.post(self, NodeBlock(blk
))
1123 fn print_else(&mut self, els
: Option
<&hir
::Expr
>) -> io
::Result
<()> {
1127 // "another else-if"
1128 hir
::ExprIf(ref i
, ref then
, ref e
) => {
1129 try
!(self.cbox(indent_unit
- 1));
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
))
1138 hir
::ExprBlock(ref b
) => {
1139 try
!(self.cbox(indent_unit
- 1));
1141 try
!(word(&mut self.s
, " else "));
1142 self.print_block(&b
)
1144 // BLEAH, constraints would be great here
1146 panic
!("print_if saw if with weird alternative");
1154 pub fn print_if(&mut self,
1157 elseopt
: Option
<&hir
::Expr
>)
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
)
1166 pub fn print_if_let(&mut self,
1170 elseopt
: Option
<&hir
::Expr
>)
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
)
1183 fn print_call_post(&mut self, args
: &[P
<hir
::Expr
>]) -> io
::Result
<()> {
1185 try
!(self.commasep_exprs(Inconsistent
, args
));
1189 pub fn print_expr_maybe_paren(&mut self, expr
: &hir
::Expr
) -> io
::Result
<()> {
1190 let needs_par
= needs_parentheses(expr
);
1194 try
!(self.print_expr(expr
));
1196 try
!(self.pclose());
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
, "]"));
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
, "]"));
1219 fn print_expr_struct(&mut self,
1221 fields
: &[hir
::Field
],
1222 wth
: &Option
<P
<hir
::Expr
>>)
1224 try
!(self.print_path(path
, true, 0));
1225 try
!(word(&mut self.s
, "{"));
1226 try
!(self.commasep_cmnt(Consistent
,
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
));
1238 try
!(self.ibox(indent_unit
));
1239 if !fields
.is_empty() {
1240 try
!(word(&mut self.s
, ","));
1241 try
!(space(&mut self.s
));
1243 try
!(word(&mut self.s
, ".."));
1244 try
!(self.print_expr(&expr
));
1247 _
=> if !fields
.is_empty() {
1248 try
!(word(&mut self.s
, ","))
1251 try
!(word(&mut self.s
, "}"));
1255 fn print_expr_tup(&mut self, exprs
: &[P
<hir
::Expr
>]) -> io
::Result
<()> {
1257 try
!(self.commasep_exprs(Inconsistent
, &exprs
[..]));
1258 if exprs
.len() == 1 {
1259 try
!(word(&mut self.s
, ","));
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
)
1269 fn print_expr_method_call(&mut self,
1270 name
: Spanned
<ast
::Name
>,
1272 args
: &[P
<hir
::Expr
>])
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
, ">"));
1283 self.print_call_post(base_args
)
1286 fn print_expr_binary(&mut self,
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
)
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
)
1302 fn print_expr_addr_of(&mut self,
1303 mutability
: hir
::Mutability
,
1306 try
!(word(&mut self.s
, "&"));
1307 try
!(self.print_mutability(mutability
));
1308 self.print_expr_maybe_paren(expr
)
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
)));
1316 hir
::ExprBox(ref expr
) => {
1317 try
!(self.word_space("box"));
1318 try
!(self.print_expr(expr
));
1320 hir
::ExprVec(ref exprs
) => {
1321 try
!(self.print_expr_vec(&exprs
[..]));
1323 hir
::ExprRepeat(ref element
, ref count
) => {
1324 try
!(self.print_expr_repeat(&element
, &count
));
1326 hir
::ExprStruct(ref path
, ref fields
, ref wth
) => {
1327 try
!(self.print_expr_struct(path
, &fields
[..], wth
));
1329 hir
::ExprTup(ref exprs
) => {
1330 try
!(self.print_expr_tup(&exprs
[..]));
1332 hir
::ExprCall(ref func
, ref args
) => {
1333 try
!(self.print_expr_call(&func
, &args
[..]));
1335 hir
::ExprMethodCall(name
, ref tys
, ref args
) => {
1336 try
!(self.print_expr_method_call(name
, &tys
[..], &args
[..]));
1338 hir
::ExprBinary(op
, ref lhs
, ref rhs
) => {
1339 try
!(self.print_expr_binary(op
, &lhs
, &rhs
));
1341 hir
::ExprUnary(op
, ref expr
) => {
1342 try
!(self.print_expr_unary(op
, &expr
));
1344 hir
::ExprAddrOf(m
, ref expr
) => {
1345 try
!(self.print_expr_addr_of(m
, &expr
));
1347 hir
::ExprLit(ref lit
) => {
1348 try
!(self.print_literal(&lit
));
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
));
1356 hir
::ExprType(ref expr
, ref ty
) => {
1357 try
!(self.print_expr(&expr
));
1358 try
!(self.word_space(":"));
1359 try
!(self.print_type(&ty
));
1361 hir
::ExprIf(ref test
, ref blk
, ref elseopt
) => {
1362 try
!(self.print_if(&test
, &blk
, elseopt
.as_ref().map(|e
| &**e
)));
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(":"));
1369 try
!(self.head("while"));
1370 try
!(self.print_expr(&test
));
1371 try
!(space(&mut self.s
));
1372 try
!(self.print_block(&blk
));
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(":"));
1379 try
!(self.head("loop"));
1380 try
!(space(&mut self.s
));
1381 try
!(self.print_block(&blk
));
1383 hir
::ExprMatch(ref expr
, ref arms
, _
) => {
1384 try
!(self.cbox(indent_unit
));
1386 try
!(self.word_nbsp("match"));
1387 try
!(self.print_expr(&expr
));
1388 try
!(space(&mut self.s
));
1391 try
!(self.print_arm(arm
));
1393 try
!(self.bclose_(expr
.span
, indent_unit
));
1395 hir
::ExprClosure(capture_clause
, ref decl
, ref body
) => {
1396 try
!(self.print_capture_clause(capture_clause
));
1398 try
!(self.print_fn_block_args(&decl
));
1399 try
!(space(&mut self.s
));
1401 let default_return
= match decl
.output
{
1402 hir
::DefaultReturn(..) => true,
1406 if !default_return
|| !body
.stmts
.is_empty() || body
.expr
.is_none() {
1407 try
!(self.print_block_unclosed(&body
));
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
));
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
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.
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 {
1431 try
!(self.print_block(&blk
));
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
));
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
));
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
));
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
));
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
, "]"));
1462 hir
::ExprRange(ref start
, ref end
) => {
1463 if let &Some(ref e
) = start
{
1464 try
!(self.print_expr(&e
));
1466 try
!(word(&mut self.s
, ".."));
1467 if let &Some(ref e
) = end
{
1468 try
!(self.print_expr(&e
));
1471 hir
::ExprPath(None
, ref path
) => {
1472 try
!(self.print_path(path
, true, 0))
1474 hir
::ExprPath(Some(ref qself
), ref path
) => {
1475 try
!(self.print_qpath(path
, qself
, true))
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
));
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
))
1493 hir
::ExprRet(ref result
) => {
1494 try
!(word(&mut self.s
, "return"));
1497 try
!(word(&mut self.s
, " "));
1498 try
!(self.print_expr(&expr
));
1503 hir
::ExprInlineAsm(ref a
) => {
1504 try
!(word(&mut self.s
, "asm!"));
1506 try
!(self.print_string(&a
.asm
, a
.asm_str_style
));
1507 try
!(self.word_space(":"));
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
))
1514 _
=> try
!(s
.print_string(&out
.constraint
, ast
::StrStyle
::Cooked
)),
1517 try
!(s
.print_expr(&out
.expr
));
1521 try
!(space(&mut self.s
));
1522 try
!(self.word_space(":"));
1524 try
!(self.commasep(Inconsistent
, &a
.inputs
, |s
, &(ref co
, ref o
)| {
1525 try
!(s
.print_string(&co
, ast
::StrStyle
::Cooked
));
1527 try
!(s
.print_expr(&o
));
1531 try
!(space(&mut self.s
));
1532 try
!(self.word_space(":"));
1534 try
!(self.commasep(Inconsistent
, &a
.clobbers
, |s
, co
| {
1535 try
!(s
.print_string(&co
, ast
::StrStyle
::Cooked
));
1539 let mut options
= vec
![];
1541 options
.push("volatile");
1544 options
.push("alignstack");
1546 if a
.dialect
== ast
::AsmDialect
::Intel
{
1547 options
.push("intel");
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
));
1559 try
!(self.pclose());
1562 try
!(self.ann
.post(self, NodeExpr(expr
)));
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
));
1575 pub fn print_decl(&mut self, decl
: &hir
::Decl
) -> io
::Result
<()> {
1576 try
!(self.maybe_print_comment(decl
.span
.lo
));
1578 hir
::DeclLocal(ref loc
) => {
1579 try
!(self.space_if_not_bol());
1580 try
!(self.ibox(indent_unit
));
1581 try
!(self.word_nbsp("let"));
1583 try
!(self.ibox(indent_unit
));
1584 try
!(self.print_local_decl(&loc
));
1586 if let Some(ref init
) = loc
.init
{
1588 try
!(self.word_space("="));
1589 try
!(self.print_expr(&init
));
1593 hir
::DeclItem(ref item
) => {
1594 self.print_item_id(item
)
1599 pub fn print_usize(&mut self, i
: usize) -> io
::Result
<()> {
1600 word(&mut self.s
, &i
.to_string())
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
))
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
)
1615 fn print_path(&mut self,
1617 colons_before_params
: bool
,
1620 try
!(self.maybe_print_comment(path
.span
.lo
));
1622 let mut first
= !path
.global
;
1623 for segment
in &path
.segments
[..path
.segments
.len() - depth
] {
1627 try
!(word(&mut self.s
, "::"))
1630 try
!(self.print_name(segment
.identifier
.name
));
1632 try
!(self.print_path_parameters(&segment
.parameters
, colons_before_params
));
1638 fn print_qpath(&mut self,
1641 colons_before_params
: bool
)
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
));
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
)
1658 fn print_path_parameters(&mut self,
1659 parameters
: &hir
::PathParameters
,
1660 colons_before_params
: bool
)
1662 if parameters
.is_empty() {
1666 if colons_before_params
{
1667 try
!(word(&mut self.s
, "::"))
1671 hir
::AngleBracketedParameters(ref data
) => {
1672 try
!(word(&mut self.s
, "<"));
1674 let mut comma
= false;
1675 for lifetime
in &data
.lifetimes
{
1677 try
!(self.word_space(","))
1679 try
!(self.print_lifetime(lifetime
));
1683 if !data
.types
.is_empty() {
1685 try
!(self.word_space(","))
1687 try
!(self.commasep(Inconsistent
, &data
.types
, |s
, ty
| s
.print_type(&ty
)));
1691 for binding
in data
.bindings
.iter() {
1693 try
!(self.word_space(","))
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
));
1702 try
!(word(&mut self.s
, ">"))
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
, ")"));
1713 try
!(self.space_if_not_bol());
1714 try
!(self.word_space("->"));
1715 try
!(self.print_type(&ty
));
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
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
));
1737 hir
::BindByValue(hir
::MutImmutable
) => {}
1738 hir
::BindByValue(hir
::MutMutable
) => {
1739 try
!(self.word_nbsp("mut"));
1742 try
!(self.print_name(path1
.node
.name
));
1745 try
!(word(&mut self.s
, "@"));
1746 try
!(self.print_pat(&p
));
1751 PatKind
::TupleStruct(ref path
, ref args_
) => {
1752 try
!(self.print_path(path
, true, 0));
1754 None
=> try
!(word(&mut self.s
, "(..)")),
1757 try
!(self.commasep(Inconsistent
, &args
[..], |s
, p
| s
.print_pat(&p
)));
1758 try
!(self.pclose());
1762 PatKind
::Path(ref path
) => {
1763 try
!(self.print_path(path
, true, 0));
1765 PatKind
::QPath(ref qself
, ref path
) => {
1766 try
!(self.print_qpath(path
, qself
, false));
1768 PatKind
::Struct(ref path
, ref fields
, etc
) => {
1769 try
!(self.print_path(path
, true, 0));
1771 try
!(self.word_space("{"));
1772 try
!(self.commasep_cmnt(Consistent
,
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(":"));
1780 try
!(s
.print_pat(&f
.node
.pat
));
1783 |f
| f
.node
.pat
.span
));
1785 if !fields
.is_empty() {
1786 try
!(self.word_space(","));
1788 try
!(word(&mut self.s
, ".."));
1790 try
!(space(&mut self.s
));
1791 try
!(word(&mut self.s
, "}"));
1793 PatKind
::Tup(ref elts
) => {
1795 try
!(self.commasep(Inconsistent
, &elts
[..], |s
, p
| s
.print_pat(&p
)));
1796 if elts
.len() == 1 {
1797 try
!(word(&mut self.s
, ","));
1799 try
!(self.pclose());
1801 PatKind
::Box(ref inner
) => {
1802 try
!(word(&mut self.s
, "box "));
1803 try
!(self.print_pat(&inner
));
1805 PatKind
::Ref(ref inner
, mutbl
) => {
1806 try
!(word(&mut self.s
, "&"));
1807 if mutbl
== hir
::MutMutable
{
1808 try
!(word(&mut self.s
, "mut "));
1810 try
!(self.print_pat(&inner
));
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
));
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(","));
1826 if p
.node
!= PatKind
::Wild
{
1827 try
!(self.print_pat(&p
));
1829 try
!(word(&mut self.s
, ".."));
1830 if !after
.is_empty() {
1831 try
!(self.word_space(","));
1834 try
!(self.commasep(Inconsistent
, &after
[..], |s
, p
| s
.print_pat(&p
)));
1835 try
!(word(&mut self.s
, "]"));
1838 self.ann
.post(self, NodePat(pat
))
1841 fn print_arm(&mut self, arm
: &hir
::Arm
) -> io
::Result
<()> {
1842 // I have no idea why this check is necessary, but here it
1844 if arm
.attrs
.is_empty() {
1845 try
!(space(&mut self.s
));
1847 try
!(self.cbox(indent_unit
));
1849 try
!(self.print_outer_attributes(&arm
.attrs
));
1850 let mut first
= true;
1851 for p
in &arm
.pats
{
1855 try
!(space(&mut self.s
));
1856 try
!(self.word_space("|"));
1858 try
!(self.print_pat(&p
));
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
));
1866 try
!(self.word_space("=>"));
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
));
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
, ","));
1879 try
!(self.end()); // close the ibox for the pattern
1880 try
!(self.print_expr(&arm
.body
));
1881 try
!(word(&mut self.s
, ","));
1884 self.end() // close enclosing cbox
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
=> {
1897 hir
::SelfValue(_
) => {
1898 try
!(word(&mut self.s
, "self"));
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"));
1906 hir
::SelfExplicit(ref typ
, _
) => {
1907 try
!(word(&mut self.s
, "self"));
1908 try
!(self.word_space(":"));
1909 try
!(self.print_type(&typ
));
1915 pub fn print_fn(&mut self,
1917 unsafety
: hir
::Unsafety
,
1918 constness
: hir
::Constness
,
1920 name
: Option
<ast
::Name
>,
1921 generics
: &hir
::Generics
,
1922 opt_explicit_self
: Option
<&hir
::ExplicitSelf_
>,
1923 vis
: hir
::Visibility
)
1925 try
!(self.print_fn_header_info(unsafety
, constness
, abi
, vis
));
1927 if let Some(name
) = name
{
1929 try
!(self.print_name(name
));
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
)
1936 pub fn print_fn_args(&mut self,
1938 opt_explicit_self
: Option
<&hir
::ExplicitSelf_
>,
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
,
1953 first
= !try
!(self.print_explicit_self(explicit_self
, m
));
1956 // HACK(eddyb) ignore the separately printed self argument.
1957 let args
= if first
{
1967 try
!(self.word_space(","));
1969 try
!(self.print_arg(arg
, is_closure
));
1975 pub fn print_fn_args_and_ret(&mut self,
1977 opt_explicit_self
: Option
<&hir
::ExplicitSelf_
>)
1980 try
!(self.print_fn_args(decl
, opt_explicit_self
, false));
1982 try
!(word(&mut self.s
, ", ..."));
1984 try
!(self.pclose());
1986 self.print_fn_output(decl
)
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
, "|"));
1994 if let hir
::DefaultReturn(..) = decl
.output
{
1998 try
!(self.space_if_not_bol());
1999 try
!(self.word_space("->"));
2001 hir
::Return(ref ty
) => {
2002 try
!(self.print_type(&ty
));
2003 self.maybe_print_comment(ty
.span
.lo
)
2005 hir
::DefaultReturn(..) => unreachable
!(),
2006 hir
::NoReturn(span
) => {
2007 try
!(self.word_nbsp("!"));
2008 self.maybe_print_comment(span
.lo
)
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(()),
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
{
2029 try
!(self.word_space("+"));
2033 TraitTyParamBound(ref tref
, TraitBoundModifier
::None
) => {
2034 self.print_poly_trait_ref(tref
)
2036 TraitTyParamBound(ref tref
, TraitBoundModifier
::Maybe
) => {
2037 try
!(word(&mut self.s
, "?"));
2038 self.print_poly_trait_ref(tref
)
2040 RegionTyParamBound(ref lt
) => {
2041 self.print_lifetime(lt
)
2051 pub fn print_lifetime(&mut self, lifetime
: &hir
::Lifetime
) -> io
::Result
<()> {
2052 self.print_name(lifetime
.name
)
2055 pub fn print_lifetime_def(&mut self, lifetime
: &hir
::LifetimeDef
) -> io
::Result
<()> {
2056 try
!(self.print_lifetime(&lifetime
.lifetime
));
2058 for v
in &lifetime
.bounds
{
2059 try
!(word(&mut self.s
, sep
));
2060 try
!(self.print_lifetime(v
));
2066 pub fn print_generics(&mut self, generics
: &hir
::Generics
) -> io
::Result
<()> {
2067 let total
= generics
.lifetimes
.len() + generics
.ty_params
.len();
2072 try
!(word(&mut self.s
, "<"));
2074 let mut ints
= Vec
::new();
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
)
2084 let idx
= idx
- generics
.lifetimes
.len();
2085 let param
= &generics
.ty_params
[idx
];
2086 s
.print_ty_param(param
)
2090 try
!(word(&mut self.s
, ">"));
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(":", ¶m
.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)
2107 pub fn print_where_clause(&mut self, where_clause
: &hir
::WhereClause
) -> io
::Result
<()> {
2108 if where_clause
.predicates
.is_empty() {
2112 try
!(space(&mut self.s
));
2113 try
!(self.word_space("where"));
2115 for (i
, predicate
) in where_clause
.predicates
.iter().enumerate() {
2117 try
!(self.word_space(","));
2121 &hir
::WherePredicate
::BoundPredicate(hir
::WhereBoundPredicate
{ref bound_lifetimes
,
2125 try
!(self.print_formal_lifetime_list(bound_lifetimes
));
2126 try
!(self.print_type(&bounded_ty
));
2127 try
!(self.print_bounds(":", bounds
));
2129 &hir
::WherePredicate
::RegionPredicate(hir
::WhereRegionPredicate
{ref lifetime
,
2132 try
!(self.print_lifetime(lifetime
));
2133 try
!(word(&mut self.s
, ":"));
2135 for (i
, bound
) in bounds
.iter().enumerate() {
2136 try
!(self.print_lifetime(bound
));
2139 try
!(word(&mut self.s
, ":"));
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
));
2155 pub fn print_view_path(&mut self, vp
: &hir
::ViewPath
) -> io
::Result
<()> {
2157 hir
::ViewPathSimple(name
, ref path
) => {
2158 try
!(self.print_path(path
, false, 0));
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
));
2169 hir
::ViewPathGlob(ref path
) => {
2170 try
!(self.print_path(path
, false, 0));
2171 word(&mut self.s
, "::*")
2174 hir
::ViewPathList(ref path
, ref segments
) => {
2175 if path
.segments
.is_empty() {
2176 try
!(word(&mut self.s
, "{"));
2178 try
!(self.print_path(path
, false, 0));
2179 try
!(word(&mut self.s
, "::{"));
2181 try
!(self.commasep(Inconsistent
, &segments
[..], |s
, w
| {
2183 hir
::PathListIdent { name, .. }
=> {
2186 hir
::PathListMod { .. }
=> {
2187 word(&mut s
.s
, "self")
2191 word(&mut self.s
, "}")
2196 pub fn print_mutability(&mut self, mutbl
: hir
::Mutability
) -> io
::Result
<()> {
2198 hir
::MutMutable
=> self.word_nbsp("mut"),
2199 hir
::MutImmutable
=> Ok(()),
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
)
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
)),
2213 match input
.pat
.node
{
2214 PatKind
::Ident(_
, ref path1
, _
) if
2216 parse
::token
::special_idents
::invalid
.name
=> {
2220 try
!(self.print_pat(&input
.pat
));
2221 try
!(word(&mut self.s
, ":"));
2222 try
!(space(&mut self.s
));
2225 try
!(self.print_type(&input
.ty
));
2231 pub fn print_fn_output(&mut self, decl
: &hir
::FnDecl
) -> io
::Result
<()> {
2232 if let hir
::DefaultReturn(..) = decl
.output
{
2236 try
!(self.space_if_not_bol());
2237 try
!(self.ibox(indent_unit
));
2238 try
!(self.word_space("->"));
2240 hir
::NoReturn(_
) => try
!(self.word_nbsp("!")),
2241 hir
::DefaultReturn(..) => unreachable
!(),
2242 hir
::Return(ref ty
) => try
!(self.print_type(&ty
)),
2247 hir
::Return(ref output
) => self.maybe_print_comment(output
.span
.lo
),
2252 pub fn print_ty_fn(&mut self,
2254 unsafety
: hir
::Unsafety
,
2256 name
: Option
<ast
::Name
>,
2257 generics
: &hir
::Generics
,
2258 opt_explicit_self
: Option
<&hir
::ExplicitSelf_
>)
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
));
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(),
2273 try
!(self.print_fn(decl
,
2275 hir
::Constness
::NotConst
,
2284 pub fn maybe_print_trailing_comment(&mut self,
2285 span
: codemap
::Span
,
2286 next_pos
: Option
<BytePos
>)
2288 let cm
= match self.cm
{
2292 match self.next_comment() {
2294 if (*cmnt
).style
!= comments
::Trailing
{
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);
2302 Some(p
) => next
= p
,
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;
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
));
2322 match self.next_comment() {
2324 try
!(self.print_comment(cmnt
));
2325 self.cur_cmnt_and_lit
.cur_cmnt
+= 1;
2333 pub fn print_opt_abi_and_extern_if_nondefault(&mut self,
2334 opt_abi
: Option
<Abi
>)
2337 Some(Abi
::Rust
) => Ok(()),
2339 try
!(self.word_nbsp("extern"));
2340 self.word_nbsp(&abi
.to_string())
2346 pub fn print_extern_opt_abi(&mut self, opt_abi
: Option
<Abi
>) -> io
::Result
<()> {
2349 try
!(self.word_nbsp("extern"));
2350 self.word_nbsp(&abi
.to_string())
2356 pub fn print_fn_header_info(&mut self,
2357 unsafety
: hir
::Unsafety
,
2358 constness
: hir
::Constness
,
2360 vis
: hir
::Visibility
)
2362 try
!(word(&mut self.s
, &visibility_qualified(vis
, "")));
2363 try
!(self.print_unsafety(unsafety
));
2366 hir
::Constness
::NotConst
=> {}
2367 hir
::Constness
::Const
=> try
!(self.word_nbsp("const")),
2370 if abi
!= Abi
::Rust
{
2371 try
!(self.word_nbsp("extern"));
2372 try
!(self.word_nbsp(&abi
.to_string()));
2375 word(&mut self.s
, "fn")
2378 pub fn print_unsafety(&mut self, s
: hir
::Unsafety
) -> io
::Result
<()> {
2380 hir
::Unsafety
::Normal
=> Ok(()),
2381 hir
::Unsafety
::Unsafe
=> self.word_nbsp("unsafe"),
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 {...}
2393 /// isn't parsed as (if true {...} else {...} | x) | 5
2394 fn expr_requires_semi_to_be_stmt(e
: &hir
::Expr
) -> bool
{
2397 hir
::ExprMatch(..) |
2399 hir
::ExprWhile(..) |
2400 hir
::ExprLoop(..) => false,
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
{
2410 hir
::StmtDecl(ref d
, _
) => {
2412 hir
::DeclLocal(_
) => true,
2413 hir
::DeclItem(_
) => false,
2416 hir
::StmtExpr(ref e
, _
) => {
2417 expr_requires_semi_to_be_stmt(&e
)
2419 hir
::StmtSemi(..) => {