1 // Copyright 2012-2014 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::*;
14 use ast::{self, FnUnboxedClosureKind, FnMutUnboxedClosureKind};
15 use ast::{FnOnceUnboxedClosureKind};
16 use ast::{MethodImplItem, RegionTyParamBound, TraitTyParamBound, TraitBoundModifier};
17 use ast::{RequiredMethod, ProvidedMethod, TypeImplItem, TypeTraitItem};
18 use ast::{UnboxedClosureKind};
20 use owned_slice::OwnedSlice;
21 use attr::{AttrMetaMethods, AttributeMethods};
22 use codemap::{self, CodeMap, BytePos};
24 use parse::token::{self, BinOpToken, Token};
25 use parse::lexer::comments;
27 use print::pp::{self, break_offset, word, space, zerobreak, hardbreak};
28 use print::pp::{Breaks, Consistent, Inconsistent, eof};
31 use std::{ascii, mem};
32 use std::io::{self, IoResult};
35 pub enum AnnNode<'a> {
36 NodeIdent(&'a ast::Ident),
37 NodeName(&'a ast::Name),
38 NodeBlock(&'a ast::Block),
39 NodeItem(&'a ast::Item),
40 NodeExpr(&'a ast::Expr),
41 NodePat(&'a ast::Pat),
45 fn pre(&self, _state: &mut State, _node: AnnNode) -> IoResult<()> { Ok(()) }
46 fn post(&self, _state: &mut State, _node: AnnNode) -> IoResult<()> { Ok(()) }
52 impl PpAnn for NoAnn {}
55 pub struct CurrentCommentAndLiteral {
60 pub struct State<'a> {
62 cm: Option<&'a CodeMap>,
63 comments: Option<Vec<comments::Comment> >,
64 literals: Option<Vec<comments::Literal> >,
65 cur_cmnt_and_lit: CurrentCommentAndLiteral,
66 boxes: Vec<pp::Breaks>,
68 encode_idents_with_hygiene: bool,
71 pub fn rust_printer(writer: Box<io::Writer+'static>) -> State<'static> {
72 static NO_ANN: NoAnn = NoAnn;
73 rust_printer_annotated(writer, &NO_ANN)
76 pub fn rust_printer_annotated<'a>(writer: Box<io::Writer+'static>,
77 ann: &'a PpAnn) -> State<'a> {
79 s: pp::mk_printer(writer, default_columns),
83 cur_cmnt_and_lit: CurrentCommentAndLiteral {
89 encode_idents_with_hygiene: false,
93 #[allow(non_upper_case_globals)]
94 pub const indent_unit: uint = 4u;
96 #[allow(non_upper_case_globals)]
97 pub const default_columns: uint = 78u;
99 /// Requires you to pass an input filename and reader so that
100 /// it can scan the input text for comments and literals to
102 pub fn print_crate<'a>(cm: &'a CodeMap,
103 span_diagnostic: &diagnostic::SpanHandler,
106 input: &mut io::Reader,
107 out: Box<io::Writer+'static>,
109 is_expanded: bool) -> IoResult<()> {
110 let mut s = State::new_from_input(cm,
117 try!(s.print_mod(&krate.module, krate.attrs[]));
118 try!(s.print_remaining_comments());
123 pub fn new_from_input(cm: &'a CodeMap,
124 span_diagnostic: &diagnostic::SpanHandler,
126 input: &mut io::Reader,
127 out: Box<io::Writer+'static>,
129 is_expanded: bool) -> State<'a> {
130 let (cmnts, lits) = comments::gather_comments_and_literals(
140 // If the code is post expansion, don't use the table of
141 // literals, since it doesn't correspond with the literals
142 // in the AST anymore.
143 if is_expanded { None } else { Some(lits) })
146 pub fn new(cm: &'a CodeMap,
147 out: Box<io::Writer+'static>,
149 comments: Option<Vec<comments::Comment>>,
150 literals: Option<Vec<comments::Literal>>) -> State<'a> {
152 s: pp::mk_printer(out, default_columns),
156 cur_cmnt_and_lit: CurrentCommentAndLiteral {
162 encode_idents_with_hygiene: false,
167 pub fn to_string<F>(f: F) -> String where
168 F: FnOnce(&mut State) -> IoResult<()>,
170 use std::raw::TraitObject;
171 let mut s = rust_printer(box Vec::new());
173 eof(&mut s.s).unwrap();
175 // FIXME(pcwalton): A nasty function to extract the string from an `io::Writer`
176 // that we "know" to be a `Vec<u8>` that works around the lack of checked
178 let obj: &TraitObject = mem::transmute(&s.s.out);
179 mem::transmute::<*mut (), &Vec<u8>>(obj.data)
181 String::from_utf8(wr.clone()).unwrap()
184 pub fn binop_to_string(op: BinOpToken) -> &'static str {
190 token::Percent => "%",
199 pub fn token_to_string(tok: &Token) -> String {
201 token::Eq => "=".to_string(),
202 token::Lt => "<".to_string(),
203 token::Le => "<=".to_string(),
204 token::EqEq => "==".to_string(),
205 token::Ne => "!=".to_string(),
206 token::Ge => ">=".to_string(),
207 token::Gt => ">".to_string(),
208 token::Not => "!".to_string(),
209 token::Tilde => "~".to_string(),
210 token::OrOr => "||".to_string(),
211 token::AndAnd => "&&".to_string(),
212 token::BinOp(op) => binop_to_string(op).to_string(),
213 token::BinOpEq(op) => format!("{}=", binop_to_string(op)),
215 /* Structural symbols */
216 token::At => "@".to_string(),
217 token::Dot => ".".to_string(),
218 token::DotDot => "..".to_string(),
219 token::DotDotDot => "...".to_string(),
220 token::Comma => ",".to_string(),
221 token::Semi => ";".to_string(),
222 token::Colon => ":".to_string(),
223 token::ModSep => "::".to_string(),
224 token::RArrow => "->".to_string(),
225 token::LArrow => "<-".to_string(),
226 token::FatArrow => "=>".to_string(),
227 token::OpenDelim(token::Paren) => "(".to_string(),
228 token::CloseDelim(token::Paren) => ")".to_string(),
229 token::OpenDelim(token::Bracket) => "[".to_string(),
230 token::CloseDelim(token::Bracket) => "]".to_string(),
231 token::OpenDelim(token::Brace) => "{".to_string(),
232 token::CloseDelim(token::Brace) => "}".to_string(),
233 token::Pound => "#".to_string(),
234 token::Dollar => "$".to_string(),
235 token::Question => "?".to_string(),
238 token::Literal(lit, suf) => {
239 let mut out = match lit {
240 token::Byte(b) => format!("b'{}'", b.as_str()),
241 token::Char(c) => format!("'{}'", c.as_str()),
242 token::Float(c) => c.as_str().to_string(),
243 token::Integer(c) => c.as_str().to_string(),
244 token::Str_(s) => format!("\"{}\"", s.as_str()),
245 token::StrRaw(s, n) => format!("r{delim}\"{string}\"{delim}",
246 delim=repeat("#", n),
248 token::Binary(v) => format!("b\"{}\"", v.as_str()),
249 token::BinaryRaw(s, n) => format!("br{delim}\"{string}\"{delim}",
250 delim=repeat("#", n),
254 if let Some(s) = suf {
255 out.push_str(s.as_str())
261 /* Name components */
262 token::Ident(s, _) => token::get_ident(s).get().to_string(),
263 token::Lifetime(s) => format!("{}", token::get_ident(s)),
264 token::Underscore => "_".to_string(),
267 token::DocComment(s) => s.as_str().to_string(),
268 token::SubstNt(s, _) => format!("${}", s),
269 token::MatchNt(s, t, _, _) => format!("${}:{}", s, t),
270 token::Eof => "<eof>".to_string(),
271 token::Whitespace => " ".to_string(),
272 token::Comment => "/* */".to_string(),
273 token::Shebang(s) => format!("/* shebang: {}*/", s.as_str()),
275 token::Interpolated(ref nt) => match *nt {
276 token::NtExpr(ref e) => expr_to_string(&**e),
277 token::NtMeta(ref e) => meta_item_to_string(&**e),
278 token::NtTy(ref e) => ty_to_string(&**e),
279 token::NtPath(ref e) => path_to_string(&**e),
280 token::NtItem(..) => "an interpolated item".to_string(),
281 token::NtBlock(..) => "an interpolated block".to_string(),
282 token::NtStmt(..) => "an interpolated statement".to_string(),
283 token::NtPat(..) => "an interpolated pattern".to_string(),
284 token::NtIdent(..) => "an interpolated identifier".to_string(),
285 token::NtTT(..) => "an interpolated tt".to_string(),
290 // FIXME (Issue #16472): the thing_to_string_impls macro should go away
291 // after we revise the syntax::ext::quote::ToToken impls to go directly
292 // to token-trees instead of thing -> string -> token-trees.
294 macro_rules! thing_to_string_impls {
295 ($to_string:ident) => {
297 pub fn ty_to_string(ty: &ast::Ty) -> String {
298 $to_string(|s| s.print_type(ty))
301 pub fn bounds_to_string(bounds: &[ast::TyParamBound]) -> String {
302 $to_string(|s| s.print_bounds("", bounds))
305 pub fn pat_to_string(pat: &ast::Pat) -> String {
306 $to_string(|s| s.print_pat(pat))
309 pub fn arm_to_string(arm: &ast::Arm) -> String {
310 $to_string(|s| s.print_arm(arm))
313 pub fn expr_to_string(e: &ast::Expr) -> String {
314 $to_string(|s| s.print_expr(e))
317 pub fn lifetime_to_string(e: &ast::Lifetime) -> String {
318 $to_string(|s| s.print_lifetime(e))
321 pub fn tt_to_string(tt: &ast::TokenTree) -> String {
322 $to_string(|s| s.print_tt(tt))
325 pub fn tts_to_string(tts: &[ast::TokenTree]) -> String {
326 $to_string(|s| s.print_tts(tts))
329 pub fn stmt_to_string(stmt: &ast::Stmt) -> String {
330 $to_string(|s| s.print_stmt(stmt))
333 pub fn item_to_string(i: &ast::Item) -> String {
334 $to_string(|s| s.print_item(i))
337 pub fn view_item_to_string(i: &ast::ViewItem) -> String {
338 $to_string(|s| s.print_view_item(i))
341 pub fn generics_to_string(generics: &ast::Generics) -> String {
342 $to_string(|s| s.print_generics(generics))
345 pub fn ty_method_to_string(p: &ast::TypeMethod) -> String {
346 $to_string(|s| s.print_ty_method(p))
349 pub fn method_to_string(p: &ast::Method) -> String {
350 $to_string(|s| s.print_method(p))
353 pub fn fn_block_to_string(p: &ast::FnDecl) -> String {
354 $to_string(|s| s.print_fn_block_args(p, None))
357 pub fn path_to_string(p: &ast::Path) -> String {
358 $to_string(|s| s.print_path(p, false))
361 pub fn ident_to_string(id: &ast::Ident) -> String {
362 $to_string(|s| s.print_ident(*id))
365 pub fn fun_to_string(decl: &ast::FnDecl, unsafety: ast::Unsafety, name: ast::Ident,
366 opt_explicit_self: Option<&ast::ExplicitSelf_>,
367 generics: &ast::Generics) -> String {
369 try!(s.print_fn(decl, Some(unsafety), abi::Rust,
370 name, generics, opt_explicit_self, ast::Inherited));
371 try!(s.end()); // Close the head box
372 s.end() // Close the outer box
376 pub fn block_to_string(blk: &ast::Block) -> String {
378 // containing cbox, will be closed by print-block at }
379 try!(s.cbox(indent_unit));
380 // head-ibox, will be closed by print-block after {
386 pub fn meta_item_to_string(mi: &ast::MetaItem) -> String {
387 $to_string(|s| s.print_meta_item(mi))
390 pub fn attribute_to_string(attr: &ast::Attribute) -> String {
391 $to_string(|s| s.print_attribute(attr))
394 pub fn lit_to_string(l: &ast::Lit) -> String {
395 $to_string(|s| s.print_literal(l))
398 pub fn explicit_self_to_string(explicit_self: &ast::ExplicitSelf_) -> String {
399 $to_string(|s| s.print_explicit_self(explicit_self, ast::MutImmutable).map(|_| {}))
402 pub fn variant_to_string(var: &ast::Variant) -> String {
403 $to_string(|s| s.print_variant(var))
406 pub fn arg_to_string(arg: &ast::Arg) -> String {
407 $to_string(|s| s.print_arg(arg))
410 pub fn mac_to_string(arg: &ast::Mac) -> String {
411 $to_string(|s| s.print_mac(arg, ::parse::token::Paren))
416 thing_to_string_impls! { to_string }
418 // FIXME (Issue #16472): the whole `with_hygiene` mod should go away
419 // after we revise the syntax::ext::quote::ToToken impls to go directly
420 // to token-trees instea of thing -> string -> token-trees.
422 pub mod with_hygiene {
425 use std::io::IoResult;
426 use super::indent_unit;
428 // This function is the trick that all the rest of the routines
430 pub fn to_string_hyg<F>(f: F) -> String where
431 F: FnOnce(&mut super::State) -> IoResult<()>,
433 super::to_string(move |s| {
434 s.encode_idents_with_hygiene = true;
439 thing_to_string_impls! { to_string_hyg }
442 pub fn visibility_qualified(vis: ast::Visibility, s: &str) -> String {
444 ast::Public => format!("pub {}", s),
445 ast::Inherited => s.to_string()
449 fn needs_parentheses(expr: &ast::Expr) -> bool {
451 ast::ExprAssign(..) | ast::ExprBinary(..) |
452 ast::ExprClosure(..) |
453 ast::ExprAssignOp(..) | ast::ExprCast(..) => true,
459 pub fn ibox(&mut self, u: uint) -> IoResult<()> {
460 self.boxes.push(pp::Inconsistent);
461 pp::ibox(&mut self.s, u)
464 pub fn end(&mut self) -> IoResult<()> {
465 self.boxes.pop().unwrap();
469 pub fn cbox(&mut self, u: uint) -> IoResult<()> {
470 self.boxes.push(pp::Consistent);
471 pp::cbox(&mut self.s, u)
475 pub fn rbox(&mut self, u: uint, b: pp::Breaks) -> IoResult<()> {
477 pp::rbox(&mut self.s, u, b)
480 pub fn nbsp(&mut self) -> IoResult<()> { word(&mut self.s, " ") }
482 pub fn word_nbsp(&mut self, w: &str) -> IoResult<()> {
483 try!(word(&mut self.s, w));
487 pub fn word_space(&mut self, w: &str) -> IoResult<()> {
488 try!(word(&mut self.s, w));
492 pub fn popen(&mut self) -> IoResult<()> { word(&mut self.s, "(") }
494 pub fn pclose(&mut self) -> IoResult<()> { word(&mut self.s, ")") }
496 pub fn head(&mut self, w: &str) -> IoResult<()> {
497 // outer-box is consistent
498 try!(self.cbox(indent_unit));
499 // head-box is inconsistent
500 try!(self.ibox(w.len() + 1));
501 // keyword that starts the head
503 try!(self.word_nbsp(w));
508 pub fn bopen(&mut self) -> IoResult<()> {
509 try!(word(&mut self.s, "{"));
510 self.end() // close the head-box
513 pub fn bclose_(&mut self, span: codemap::Span,
514 indented: uint) -> IoResult<()> {
515 self.bclose_maybe_open(span, indented, true)
517 pub fn bclose_maybe_open (&mut self, span: codemap::Span,
518 indented: uint, close_box: bool) -> IoResult<()> {
519 try!(self.maybe_print_comment(span.hi));
520 try!(self.break_offset_if_not_bol(1u, -(indented as int)));
521 try!(word(&mut self.s, "}"));
523 try!(self.end()); // close the outer-box
527 pub fn bclose(&mut self, span: codemap::Span) -> IoResult<()> {
528 self.bclose_(span, indent_unit)
531 pub fn is_begin(&mut self) -> bool {
532 match self.s.last_token() { pp::Begin(_) => true, _ => false }
535 pub fn is_end(&mut self) -> bool {
536 match self.s.last_token() { pp::End => true, _ => false }
539 // is this the beginning of a line?
540 pub fn is_bol(&mut self) -> bool {
541 self.s.last_token().is_eof() || self.s.last_token().is_hardbreak_tok()
544 pub fn in_cbox(&self) -> bool {
545 match self.boxes.last() {
546 Some(&last_box) => last_box == pp::Consistent,
551 pub fn hardbreak_if_not_bol(&mut self) -> IoResult<()> {
553 try!(hardbreak(&mut self.s))
557 pub fn space_if_not_bol(&mut self) -> IoResult<()> {
558 if !self.is_bol() { try!(space(&mut self.s)); }
561 pub fn break_offset_if_not_bol(&mut self, n: uint,
562 off: int) -> IoResult<()> {
564 break_offset(&mut self.s, n, off)
566 if off != 0 && self.s.last_token().is_hardbreak_tok() {
567 // We do something pretty sketchy here: tuck the nonzero
568 // offset-adjustment we were going to deposit along with the
569 // break into the previous hardbreak.
570 self.s.replace_last_token(pp::hardbreak_tok_offset(off));
576 // Synthesizes a comment that was not textually present in the original source
578 pub fn synth_comment(&mut self, text: String) -> IoResult<()> {
579 try!(word(&mut self.s, "/*"));
580 try!(space(&mut self.s));
581 try!(word(&mut self.s, text[]));
582 try!(space(&mut self.s));
583 word(&mut self.s, "*/")
586 pub fn commasep<T, F>(&mut self, b: Breaks, elts: &[T], mut op: F) -> IoResult<()> where
587 F: FnMut(&mut State, &T) -> IoResult<()>,
589 try!(self.rbox(0u, b));
590 let mut first = true;
591 for elt in elts.iter() {
592 if first { first = false; } else { try!(self.word_space(",")); }
599 pub fn commasep_cmnt<T, F, G>(&mut self,
603 mut get_span: G) -> IoResult<()> where
604 F: FnMut(&mut State, &T) -> IoResult<()>,
605 G: FnMut(&T) -> codemap::Span,
607 try!(self.rbox(0u, b));
608 let len = elts.len();
610 for elt in elts.iter() {
611 try!(self.maybe_print_comment(get_span(elt).hi));
615 try!(word(&mut self.s, ","));
616 try!(self.maybe_print_trailing_comment(get_span(elt),
617 Some(get_span(&elts[i]).hi)));
618 try!(self.space_if_not_bol());
624 pub fn commasep_exprs(&mut self, b: Breaks,
625 exprs: &[P<ast::Expr>]) -> IoResult<()> {
626 self.commasep_cmnt(b, exprs, |s, e| s.print_expr(&**e), |e| e.span)
629 pub fn print_mod(&mut self, _mod: &ast::Mod,
630 attrs: &[ast::Attribute]) -> IoResult<()> {
631 try!(self.print_inner_attributes(attrs));
632 for vitem in _mod.view_items.iter() {
633 try!(self.print_view_item(vitem));
635 for item in _mod.items.iter() {
636 try!(self.print_item(&**item));
641 pub fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod,
642 attrs: &[ast::Attribute]) -> IoResult<()> {
643 try!(self.print_inner_attributes(attrs));
644 for vitem in nmod.view_items.iter() {
645 try!(self.print_view_item(vitem));
647 for item in nmod.items.iter() {
648 try!(self.print_foreign_item(&**item));
653 pub fn print_opt_lifetime(&mut self,
654 lifetime: &Option<ast::Lifetime>) -> IoResult<()> {
655 for l in lifetime.iter() {
656 try!(self.print_lifetime(l));
662 pub fn print_type(&mut self, ty: &ast::Ty) -> IoResult<()> {
663 try!(self.maybe_print_comment(ty.span.lo));
666 ast::TyVec(ref ty) => {
667 try!(word(&mut self.s, "["));
668 try!(self.print_type(&**ty));
669 try!(word(&mut self.s, "]"));
671 ast::TyPtr(ref mt) => {
672 try!(word(&mut self.s, "*"));
674 ast::MutMutable => try!(self.word_nbsp("mut")),
675 ast::MutImmutable => try!(self.word_nbsp("const")),
677 try!(self.print_type(&*mt.ty));
679 ast::TyRptr(ref lifetime, ref mt) => {
680 try!(word(&mut self.s, "&"));
681 try!(self.print_opt_lifetime(lifetime));
682 try!(self.print_mt(mt));
684 ast::TyTup(ref elts) => {
686 try!(self.commasep(Inconsistent, elts[],
687 |s, ty| s.print_type(&**ty)));
689 try!(word(&mut self.s, ","));
693 ast::TyParen(ref typ) => {
695 try!(self.print_type(&**typ));
698 ast::TyBareFn(ref f) => {
699 let generics = ast::Generics {
700 lifetimes: f.lifetimes.clone(),
701 ty_params: OwnedSlice::empty(),
702 where_clause: ast::WhereClause {
703 id: ast::DUMMY_NODE_ID,
704 predicates: Vec::new(),
707 try!(self.print_ty_fn(Some(f.abi),
713 &OwnedSlice::empty(),
717 ast::TyPath(ref path, _) => {
718 try!(self.print_path(path, false));
720 ast::TyObjectSum(ref ty, ref bounds) => {
721 try!(self.print_type(&**ty));
722 try!(self.print_bounds("+", bounds[]));
724 ast::TyPolyTraitRef(ref bounds) => {
725 try!(self.print_bounds("", bounds[]));
727 ast::TyQPath(ref qpath) => {
728 try!(word(&mut self.s, "<"));
729 try!(self.print_type(&*qpath.self_type));
730 try!(space(&mut self.s));
731 try!(self.word_space("as"));
732 try!(self.print_trait_ref(&*qpath.trait_ref));
733 try!(word(&mut self.s, ">"));
734 try!(word(&mut self.s, "::"));
735 try!(self.print_ident(qpath.item_name));
737 ast::TyFixedLengthVec(ref ty, ref v) => {
738 try!(word(&mut self.s, "["));
739 try!(self.print_type(&**ty));
740 try!(word(&mut self.s, "; "));
741 try!(self.print_expr(&**v));
742 try!(word(&mut self.s, "]"));
744 ast::TyTypeof(ref e) => {
745 try!(word(&mut self.s, "typeof("));
746 try!(self.print_expr(&**e));
747 try!(word(&mut self.s, ")"));
750 try!(word(&mut self.s, "_"));
756 pub fn print_foreign_item(&mut self,
757 item: &ast::ForeignItem) -> IoResult<()> {
758 try!(self.hardbreak_if_not_bol());
759 try!(self.maybe_print_comment(item.span.lo));
760 try!(self.print_outer_attributes(item.attrs[]));
762 ast::ForeignItemFn(ref decl, ref generics) => {
763 try!(self.print_fn(&**decl, None, abi::Rust, item.ident, generics,
765 try!(self.end()); // end head-ibox
766 try!(word(&mut self.s, ";"));
767 self.end() // end the outer fn box
769 ast::ForeignItemStatic(ref t, m) => {
770 try!(self.head(visibility_qualified(item.vis,
773 try!(self.word_space("mut"));
775 try!(self.print_ident(item.ident));
776 try!(self.word_space(":"));
777 try!(self.print_type(&**t));
778 try!(word(&mut self.s, ";"));
779 try!(self.end()); // end the head-ibox
780 self.end() // end the outer cbox
785 fn print_associated_type(&mut self, typedef: &ast::AssociatedType)
788 try!(self.print_outer_attributes(typedef.attrs[]));
789 try!(self.word_space("type"));
790 try!(self.print_ty_param(&typedef.ty_param));
791 word(&mut self.s, ";")
794 fn print_typedef(&mut self, typedef: &ast::Typedef) -> IoResult<()> {
795 try!(self.word_space("type"));
796 try!(self.print_ident(typedef.ident));
797 try!(space(&mut self.s));
798 try!(self.word_space("="));
799 try!(self.print_type(&*typedef.typ));
800 word(&mut self.s, ";")
803 /// Pretty-print an item
804 pub fn print_item(&mut self, item: &ast::Item) -> IoResult<()> {
805 try!(self.hardbreak_if_not_bol());
806 try!(self.maybe_print_comment(item.span.lo));
807 try!(self.print_outer_attributes(item.attrs[]));
808 try!(self.ann.pre(self, NodeItem(item)));
810 ast::ItemStatic(ref ty, m, ref expr) => {
811 try!(self.head(visibility_qualified(item.vis,
813 if m == ast::MutMutable {
814 try!(self.word_space("mut"));
816 try!(self.print_ident(item.ident));
817 try!(self.word_space(":"));
818 try!(self.print_type(&**ty));
819 try!(space(&mut self.s));
820 try!(self.end()); // end the head-ibox
822 try!(self.word_space("="));
823 try!(self.print_expr(&**expr));
824 try!(word(&mut self.s, ";"));
825 try!(self.end()); // end the outer cbox
827 ast::ItemConst(ref ty, ref expr) => {
828 try!(self.head(visibility_qualified(item.vis,
830 try!(self.print_ident(item.ident));
831 try!(self.word_space(":"));
832 try!(self.print_type(&**ty));
833 try!(space(&mut self.s));
834 try!(self.end()); // end the head-ibox
836 try!(self.word_space("="));
837 try!(self.print_expr(&**expr));
838 try!(word(&mut self.s, ";"));
839 try!(self.end()); // end the outer cbox
841 ast::ItemFn(ref decl, unsafety, abi, ref typarams, ref body) => {
851 try!(word(&mut self.s, " "));
852 try!(self.print_block_with_attrs(&**body, item.attrs[]));
854 ast::ItemMod(ref _mod) => {
855 try!(self.head(visibility_qualified(item.vis,
857 try!(self.print_ident(item.ident));
860 try!(self.print_mod(_mod, item.attrs[]));
861 try!(self.bclose(item.span));
863 ast::ItemForeignMod(ref nmod) => {
864 try!(self.head("extern"));
865 try!(self.word_nbsp(nmod.abi.to_string()[]));
867 try!(self.print_foreign_mod(nmod, item.attrs[]));
868 try!(self.bclose(item.span));
870 ast::ItemTy(ref ty, ref params) => {
871 try!(self.ibox(indent_unit));
873 try!(self.word_nbsp(visibility_qualified(item.vis,
875 try!(self.print_ident(item.ident));
876 try!(self.print_generics(params));
877 try!(self.end()); // end the inner ibox
879 try!(space(&mut self.s));
880 try!(self.word_space("="));
881 try!(self.print_type(&**ty));
882 try!(self.print_where_clause(params));
883 try!(word(&mut self.s, ";"));
884 try!(self.end()); // end the outer ibox
886 ast::ItemEnum(ref enum_definition, ref params) => {
887 try!(self.print_enum_def(
895 ast::ItemStruct(ref struct_def, ref generics) => {
896 try!(self.head(visibility_qualified(item.vis,"struct")[]));
897 try!(self.print_struct(&**struct_def, generics, item.ident, item.span));
900 ast::ItemImpl(unsafety,
907 try!(self.print_visibility(item.vis));
908 try!(self.print_unsafety(unsafety));
909 try!(self.word_nbsp("impl"));
911 if generics.is_parameterized() {
912 try!(self.print_generics(generics));
913 try!(space(&mut self.s));
917 ast::ImplPolarity::Negative => {
918 try!(word(&mut self.s, "!"));
925 try!(self.print_trait_ref(t));
926 try!(space(&mut self.s));
927 try!(self.word_space("for"));
932 try!(self.print_type(&**ty));
933 try!(self.print_where_clause(generics));
935 try!(space(&mut self.s));
937 try!(self.print_inner_attributes(item.attrs[]));
938 for impl_item in impl_items.iter() {
940 ast::MethodImplItem(ref meth) => {
941 try!(self.print_method(&**meth));
943 ast::TypeImplItem(ref typ) => {
944 try!(self.print_typedef(&**typ));
948 try!(self.bclose(item.span));
950 ast::ItemTrait(unsafety, ref generics, ref bounds, ref methods) => {
952 try!(self.print_visibility(item.vis));
953 try!(self.print_unsafety(unsafety));
954 try!(self.word_nbsp("trait"));
955 try!(self.print_ident(item.ident));
956 try!(self.print_generics(generics));
957 let bounds: Vec<_> = bounds.iter().map(|b| b.clone()).collect();
958 let mut real_bounds = Vec::with_capacity(bounds.len());
959 for b in bounds.into_iter() {
960 if let TraitTyParamBound(ref ptr, ast::TraitBoundModifier::Maybe) = b {
961 try!(space(&mut self.s));
962 try!(self.word_space("for ?"));
963 try!(self.print_trait_ref(&ptr.trait_ref));
968 try!(self.print_bounds(":", real_bounds[]));
969 try!(self.print_where_clause(generics));
970 try!(word(&mut self.s, " "));
972 for meth in methods.iter() {
973 try!(self.print_trait_method(meth));
975 try!(self.bclose(item.span));
977 // I think it's reasonable to hide the context here:
978 ast::ItemMac(codemap::Spanned { node: ast::MacInvocTT(ref pth, ref tts, _),
980 try!(self.print_visibility(item.vis));
981 try!(self.print_path(pth, false));
982 try!(word(&mut self.s, "! "));
983 try!(self.print_ident(item.ident));
984 try!(self.cbox(indent_unit));
986 try!(self.print_tts(tts[]));
988 try!(word(&mut self.s, ";"));
992 self.ann.post(self, NodeItem(item))
995 fn print_trait_ref(&mut self, t: &ast::TraitRef) -> IoResult<()> {
996 self.print_path(&t.path, false)
999 fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) -> IoResult<()> {
1000 if !t.bound_lifetimes.is_empty() {
1001 try!(word(&mut self.s, "for<"));
1002 let mut comma = false;
1003 for lifetime_def in t.bound_lifetimes.iter() {
1005 try!(self.word_space(","))
1007 try!(self.print_lifetime_def(lifetime_def));
1010 try!(word(&mut self.s, ">"));
1013 self.print_trait_ref(&t.trait_ref)
1016 pub fn print_enum_def(&mut self, enum_definition: &ast::EnumDef,
1017 generics: &ast::Generics, ident: ast::Ident,
1018 span: codemap::Span,
1019 visibility: ast::Visibility) -> IoResult<()> {
1020 try!(self.head(visibility_qualified(visibility, "enum")[]));
1021 try!(self.print_ident(ident));
1022 try!(self.print_generics(generics));
1023 try!(self.print_where_clause(generics));
1024 try!(space(&mut self.s));
1025 self.print_variants(enum_definition.variants[], span)
1028 pub fn print_variants(&mut self,
1029 variants: &[P<ast::Variant>],
1030 span: codemap::Span) -> IoResult<()> {
1032 for v in variants.iter() {
1033 try!(self.space_if_not_bol());
1034 try!(self.maybe_print_comment(v.span.lo));
1035 try!(self.print_outer_attributes(v.node.attrs[]));
1036 try!(self.ibox(indent_unit));
1037 try!(self.print_variant(&**v));
1038 try!(word(&mut self.s, ","));
1040 try!(self.maybe_print_trailing_comment(v.span, None));
1045 pub fn print_visibility(&mut self, vis: ast::Visibility) -> IoResult<()> {
1047 ast::Public => self.word_nbsp("pub"),
1048 ast::Inherited => Ok(())
1052 pub fn print_struct(&mut self,
1053 struct_def: &ast::StructDef,
1054 generics: &ast::Generics,
1056 span: codemap::Span) -> IoResult<()> {
1057 try!(self.print_ident(ident));
1058 try!(self.print_generics(generics));
1059 try!(self.print_where_clause(generics));
1060 if ast_util::struct_def_is_tuple_like(struct_def) {
1061 if !struct_def.fields.is_empty() {
1064 Inconsistent, struct_def.fields[],
1066 match field.node.kind {
1067 ast::NamedField(..) => panic!("unexpected named field"),
1068 ast::UnnamedField(vis) => {
1069 try!(s.print_visibility(vis));
1070 try!(s.maybe_print_comment(field.span.lo));
1071 s.print_type(&*field.node.ty)
1076 try!(self.pclose());
1078 try!(word(&mut self.s, ";"));
1080 self.end() // close the outer-box
1084 try!(self.hardbreak_if_not_bol());
1086 for field in struct_def.fields.iter() {
1087 match field.node.kind {
1088 ast::UnnamedField(..) => panic!("unexpected unnamed field"),
1089 ast::NamedField(ident, visibility) => {
1090 try!(self.hardbreak_if_not_bol());
1091 try!(self.maybe_print_comment(field.span.lo));
1092 try!(self.print_outer_attributes(field.node.attrs[]));
1093 try!(self.print_visibility(visibility));
1094 try!(self.print_ident(ident));
1095 try!(self.word_nbsp(":"));
1096 try!(self.print_type(&*field.node.ty));
1097 try!(word(&mut self.s, ","));
1106 /// This doesn't deserve to be called "pretty" printing, but it should be
1107 /// meaning-preserving. A quick hack that might help would be to look at the
1108 /// spans embedded in the TTs to decide where to put spaces and newlines.
1109 /// But it'd be better to parse these according to the grammar of the
1110 /// appropriate macro, transcribe back into the grammar we just parsed from,
1111 /// and then pretty-print the resulting AST nodes (so, e.g., we print
1112 /// expression arguments as expressions). It can be done! I think.
1113 pub fn print_tt(&mut self, tt: &ast::TokenTree) -> IoResult<()> {
1115 ast::TtToken(_, ref tk) => {
1116 try!(word(&mut self.s, token_to_string(tk)[]));
1118 parse::token::DocComment(..) => {
1119 hardbreak(&mut self.s)
1124 ast::TtDelimited(_, ref delimed) => {
1125 try!(word(&mut self.s, token_to_string(&delimed.open_token())[]));
1126 try!(space(&mut self.s));
1127 try!(self.print_tts(delimed.tts[]));
1128 try!(space(&mut self.s));
1129 word(&mut self.s, token_to_string(&delimed.close_token())[])
1131 ast::TtSequence(_, ref seq) => {
1132 try!(word(&mut self.s, "$("));
1133 for tt_elt in seq.tts.iter() {
1134 try!(self.print_tt(tt_elt));
1136 try!(word(&mut self.s, ")"));
1137 match seq.separator {
1139 try!(word(&mut self.s, token_to_string(tk)[]));
1144 ast::ZeroOrMore => word(&mut self.s, "*"),
1145 ast::OneOrMore => word(&mut self.s, "+"),
1151 pub fn print_tts(&mut self, tts: &[ast::TokenTree]) -> IoResult<()> {
1153 for (i, tt) in tts.iter().enumerate() {
1155 try!(space(&mut self.s));
1157 try!(self.print_tt(tt));
1162 pub fn print_variant(&mut self, v: &ast::Variant) -> IoResult<()> {
1163 try!(self.print_visibility(v.node.vis));
1165 ast::TupleVariantKind(ref args) => {
1166 try!(self.print_ident(v.node.name));
1167 if !args.is_empty() {
1169 try!(self.commasep(Consistent,
1171 |s, arg| s.print_type(&*arg.ty)));
1172 try!(self.pclose());
1175 ast::StructVariantKind(ref struct_def) => {
1176 try!(self.head(""));
1177 let generics = ast_util::empty_generics();
1178 try!(self.print_struct(&**struct_def, &generics, v.node.name, v.span));
1181 match v.node.disr_expr {
1183 try!(space(&mut self.s));
1184 try!(self.word_space("="));
1185 self.print_expr(&**d)
1191 pub fn print_ty_method(&mut self, m: &ast::TypeMethod) -> IoResult<()> {
1192 try!(self.hardbreak_if_not_bol());
1193 try!(self.maybe_print_comment(m.span.lo));
1194 try!(self.print_outer_attributes(m.attrs[]));
1195 try!(self.print_ty_fn(None,
1201 &OwnedSlice::empty(),
1203 Some(&m.explicit_self.node)));
1204 word(&mut self.s, ";")
1207 pub fn print_trait_method(&mut self,
1208 m: &ast::TraitItem) -> IoResult<()> {
1210 RequiredMethod(ref ty_m) => self.print_ty_method(ty_m),
1211 ProvidedMethod(ref m) => self.print_method(&**m),
1212 TypeTraitItem(ref t) => self.print_associated_type(&**t),
1216 pub fn print_impl_item(&mut self, ii: &ast::ImplItem) -> IoResult<()> {
1218 MethodImplItem(ref m) => self.print_method(&**m),
1219 TypeImplItem(ref td) => self.print_typedef(&**td),
1223 pub fn print_method(&mut self, meth: &ast::Method) -> IoResult<()> {
1224 try!(self.hardbreak_if_not_bol());
1225 try!(self.maybe_print_comment(meth.span.lo));
1226 try!(self.print_outer_attributes(meth.attrs[]));
1228 ast::MethDecl(ident,
1236 try!(self.print_fn(&**decl,
1241 Some(&explicit_self.node),
1243 try!(word(&mut self.s, " "));
1244 self.print_block_with_attrs(&**body, meth.attrs[])
1246 ast::MethMac(codemap::Spanned { node: ast::MacInvocTT(ref pth, ref tts, _),
1248 // code copied from ItemMac:
1249 try!(self.print_path(pth, false));
1250 try!(word(&mut self.s, "! "));
1251 try!(self.cbox(indent_unit));
1253 try!(self.print_tts(tts[]));
1254 try!(self.pclose());
1255 try!(word(&mut self.s, ";"));
1261 pub fn print_outer_attributes(&mut self,
1262 attrs: &[ast::Attribute]) -> IoResult<()> {
1264 for attr in attrs.iter() {
1265 match attr.node.style {
1267 try!(self.print_attribute(attr));
1270 _ => {/* fallthrough */ }
1274 try!(self.hardbreak_if_not_bol());
1279 pub fn print_inner_attributes(&mut self,
1280 attrs: &[ast::Attribute]) -> IoResult<()> {
1282 for attr in attrs.iter() {
1283 match attr.node.style {
1285 try!(self.print_attribute(attr));
1288 _ => {/* fallthrough */ }
1292 try!(self.hardbreak_if_not_bol());
1297 pub fn print_attribute(&mut self, attr: &ast::Attribute) -> IoResult<()> {
1298 try!(self.hardbreak_if_not_bol());
1299 try!(self.maybe_print_comment(attr.span.lo));
1300 if attr.node.is_sugared_doc {
1301 word(&mut self.s, attr.value_str().unwrap().get())
1303 match attr.node.style {
1304 ast::AttrInner => try!(word(&mut self.s, "#![")),
1305 ast::AttrOuter => try!(word(&mut self.s, "#[")),
1307 try!(self.print_meta_item(&*attr.meta()));
1308 word(&mut self.s, "]")
1313 pub fn print_stmt(&mut self, st: &ast::Stmt) -> IoResult<()> {
1314 try!(self.maybe_print_comment(st.span.lo));
1316 ast::StmtDecl(ref decl, _) => {
1317 try!(self.print_decl(&**decl));
1319 ast::StmtExpr(ref expr, _) => {
1320 try!(self.space_if_not_bol());
1321 try!(self.print_expr(&**expr));
1323 ast::StmtSemi(ref expr, _) => {
1324 try!(self.space_if_not_bol());
1325 try!(self.print_expr(&**expr));
1326 try!(word(&mut self.s, ";"));
1328 ast::StmtMac(ref mac, style) => {
1329 try!(self.space_if_not_bol());
1330 let delim = match style {
1331 ast::MacStmtWithBraces => token::Brace,
1334 try!(self.print_mac(&**mac, delim));
1336 ast::MacStmtWithBraces => {}
1337 _ => try!(word(&mut self.s, ";")),
1341 if parse::classify::stmt_ends_with_semi(&st.node) {
1342 try!(word(&mut self.s, ";"));
1344 self.maybe_print_trailing_comment(st.span, None)
1347 pub fn print_block(&mut self, blk: &ast::Block) -> IoResult<()> {
1348 self.print_block_with_attrs(blk, &[])
1351 pub fn print_block_unclosed(&mut self, blk: &ast::Block) -> IoResult<()> {
1352 self.print_block_unclosed_indent(blk, indent_unit)
1355 pub fn print_block_unclosed_indent(&mut self, blk: &ast::Block,
1356 indented: uint) -> IoResult<()> {
1357 self.print_block_maybe_unclosed(blk, indented, &[], false)
1360 pub fn print_block_with_attrs(&mut self,
1362 attrs: &[ast::Attribute]) -> IoResult<()> {
1363 self.print_block_maybe_unclosed(blk, indent_unit, attrs, true)
1366 pub fn print_block_maybe_unclosed(&mut self,
1369 attrs: &[ast::Attribute],
1370 close_box: bool) -> IoResult<()> {
1372 ast::UnsafeBlock(..) => try!(self.word_space("unsafe")),
1373 ast::DefaultBlock => ()
1375 try!(self.maybe_print_comment(blk.span.lo));
1376 try!(self.ann.pre(self, NodeBlock(blk)));
1379 try!(self.print_inner_attributes(attrs));
1381 for vi in blk.view_items.iter() {
1382 try!(self.print_view_item(vi));
1384 for st in blk.stmts.iter() {
1385 try!(self.print_stmt(&**st));
1389 try!(self.space_if_not_bol());
1390 try!(self.print_expr(&**expr));
1391 try!(self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi)));
1395 try!(self.bclose_maybe_open(blk.span, indented, close_box));
1396 self.ann.post(self, NodeBlock(blk))
1399 fn print_else(&mut self, els: Option<&ast::Expr>) -> IoResult<()> {
1403 // "another else-if"
1404 ast::ExprIf(ref i, ref then, ref e) => {
1405 try!(self.cbox(indent_unit - 1u));
1406 try!(self.ibox(0u));
1407 try!(word(&mut self.s, " else if "));
1408 try!(self.print_expr(&**i));
1409 try!(space(&mut self.s));
1410 try!(self.print_block(&**then));
1411 self.print_else(e.as_ref().map(|e| &**e))
1413 // "another else-if-let"
1414 ast::ExprIfLet(ref pat, ref expr, ref then, ref e) => {
1415 try!(self.cbox(indent_unit - 1u));
1416 try!(self.ibox(0u));
1417 try!(word(&mut self.s, " else if let "));
1418 try!(self.print_pat(&**pat));
1419 try!(space(&mut self.s));
1420 try!(self.word_space("="));
1421 try!(self.print_expr(&**expr));
1422 try!(space(&mut self.s));
1423 try!(self.print_block(&**then));
1424 self.print_else(e.as_ref().map(|e| &**e))
1427 ast::ExprBlock(ref b) => {
1428 try!(self.cbox(indent_unit - 1u));
1429 try!(self.ibox(0u));
1430 try!(word(&mut self.s, " else "));
1431 self.print_block(&**b)
1433 // BLEAH, constraints would be great here
1435 panic!("print_if saw if with weird alternative");
1443 pub fn print_if(&mut self, test: &ast::Expr, blk: &ast::Block,
1444 elseopt: Option<&ast::Expr>) -> IoResult<()> {
1445 try!(self.head("if"));
1446 try!(self.print_expr(test));
1447 try!(space(&mut self.s));
1448 try!(self.print_block(blk));
1449 self.print_else(elseopt)
1452 pub fn print_if_let(&mut self, pat: &ast::Pat, expr: &ast::Expr, blk: &ast::Block,
1453 elseopt: Option<&ast::Expr>) -> IoResult<()> {
1454 try!(self.head("if let"));
1455 try!(self.print_pat(pat));
1456 try!(space(&mut self.s));
1457 try!(self.word_space("="));
1458 try!(self.print_expr(expr));
1459 try!(space(&mut self.s));
1460 try!(self.print_block(blk));
1461 self.print_else(elseopt)
1464 pub fn print_mac(&mut self, m: &ast::Mac, delim: token::DelimToken)
1467 // I think it's reasonable to hide the ctxt here:
1468 ast::MacInvocTT(ref pth, ref tts, _) => {
1469 try!(self.print_path(pth, false));
1470 try!(word(&mut self.s, "!"));
1472 token::Paren => try!(self.popen()),
1473 token::Bracket => try!(word(&mut self.s, "[")),
1474 token::Brace => try!(self.bopen()),
1476 try!(self.print_tts(tts.as_slice()));
1478 token::Paren => self.pclose(),
1479 token::Bracket => word(&mut self.s, "]"),
1480 token::Brace => self.bclose(m.span),
1487 fn print_call_post(&mut self, args: &[P<ast::Expr>]) -> IoResult<()> {
1489 try!(self.commasep_exprs(Inconsistent, args));
1493 pub fn print_expr_maybe_paren(&mut self, expr: &ast::Expr) -> IoResult<()> {
1494 let needs_par = needs_parentheses(expr);
1498 try!(self.print_expr(expr));
1500 try!(self.pclose());
1505 pub fn print_expr(&mut self, expr: &ast::Expr) -> IoResult<()> {
1506 try!(self.maybe_print_comment(expr.span.lo));
1507 try!(self.ibox(indent_unit));
1508 try!(self.ann.pre(self, NodeExpr(expr)));
1510 ast::ExprBox(ref p, ref e) => {
1511 try!(word(&mut self.s, "box"));
1512 try!(word(&mut self.s, "("));
1513 try!(p.as_ref().map_or(Ok(()), |e|self.print_expr(&**e)));
1514 try!(self.word_space(")"));
1515 try!(self.print_expr(&**e));
1517 ast::ExprVec(ref exprs) => {
1518 try!(self.ibox(indent_unit));
1519 try!(word(&mut self.s, "["));
1520 try!(self.commasep_exprs(Inconsistent, exprs[]));
1521 try!(word(&mut self.s, "]"));
1525 ast::ExprRepeat(ref element, ref count) => {
1526 try!(self.ibox(indent_unit));
1527 try!(word(&mut self.s, "["));
1528 try!(self.print_expr(&**element));
1529 try!(self.word_space(";"));
1530 try!(self.print_expr(&**count));
1531 try!(word(&mut self.s, "]"));
1535 ast::ExprStruct(ref path, ref fields, ref wth) => {
1536 try!(self.print_path(path, true));
1537 try!(word(&mut self.s, "{"));
1538 try!(self.commasep_cmnt(
1542 try!(s.ibox(indent_unit));
1543 try!(s.print_ident(field.ident.node));
1544 try!(s.word_space(":"));
1545 try!(s.print_expr(&*field.expr));
1551 try!(self.ibox(indent_unit));
1552 if !fields.is_empty() {
1553 try!(word(&mut self.s, ","));
1554 try!(space(&mut self.s));
1556 try!(word(&mut self.s, ".."));
1557 try!(self.print_expr(&**expr));
1560 _ => try!(word(&mut self.s, ","))
1562 try!(word(&mut self.s, "}"));
1564 ast::ExprTup(ref exprs) => {
1566 try!(self.commasep_exprs(Inconsistent, exprs[]));
1567 if exprs.len() == 1 {
1568 try!(word(&mut self.s, ","));
1570 try!(self.pclose());
1572 ast::ExprCall(ref func, ref args) => {
1573 try!(self.print_expr_maybe_paren(&**func));
1574 try!(self.print_call_post(args[]));
1576 ast::ExprMethodCall(ident, ref tys, ref args) => {
1577 let base_args = args.slice_from(1);
1578 try!(self.print_expr(&*args[0]));
1579 try!(word(&mut self.s, "."));
1580 try!(self.print_ident(ident.node));
1582 try!(word(&mut self.s, "::<"));
1583 try!(self.commasep(Inconsistent, tys[],
1584 |s, ty| s.print_type(&**ty)));
1585 try!(word(&mut self.s, ">"));
1587 try!(self.print_call_post(base_args));
1589 ast::ExprBinary(op, ref lhs, ref rhs) => {
1590 try!(self.print_expr(&**lhs));
1591 try!(space(&mut self.s));
1592 try!(self.word_space(ast_util::binop_to_string(op)));
1593 try!(self.print_expr(&**rhs));
1595 ast::ExprUnary(op, ref expr) => {
1596 try!(word(&mut self.s, ast_util::unop_to_string(op)));
1597 try!(self.print_expr_maybe_paren(&**expr));
1599 ast::ExprAddrOf(m, ref expr) => {
1600 try!(word(&mut self.s, "&"));
1601 try!(self.print_mutability(m));
1602 try!(self.print_expr_maybe_paren(&**expr));
1604 ast::ExprLit(ref lit) => try!(self.print_literal(&**lit)),
1605 ast::ExprCast(ref expr, ref ty) => {
1606 try!(self.print_expr(&**expr));
1607 try!(space(&mut self.s));
1608 try!(self.word_space("as"));
1609 try!(self.print_type(&**ty));
1611 ast::ExprIf(ref test, ref blk, ref elseopt) => {
1612 try!(self.print_if(&**test, &**blk, elseopt.as_ref().map(|e| &**e)));
1614 ast::ExprIfLet(ref pat, ref expr, ref blk, ref elseopt) => {
1615 try!(self.print_if_let(&**pat, &**expr, &** blk, elseopt.as_ref().map(|e| &**e)));
1617 ast::ExprWhile(ref test, ref blk, opt_ident) => {
1618 for ident in opt_ident.iter() {
1619 try!(self.print_ident(*ident));
1620 try!(self.word_space(":"));
1622 try!(self.head("while"));
1623 try!(self.print_expr(&**test));
1624 try!(space(&mut self.s));
1625 try!(self.print_block(&**blk));
1627 ast::ExprWhileLet(ref pat, ref expr, ref blk, opt_ident) => {
1628 for ident in opt_ident.iter() {
1629 try!(self.print_ident(*ident));
1630 try!(self.word_space(":"));
1632 try!(self.head("while let"));
1633 try!(self.print_pat(&**pat));
1634 try!(space(&mut self.s));
1635 try!(self.word_space("="));
1636 try!(self.print_expr(&**expr));
1637 try!(space(&mut self.s));
1638 try!(self.print_block(&**blk));
1640 ast::ExprForLoop(ref pat, ref iter, ref blk, opt_ident) => {
1641 for ident in opt_ident.iter() {
1642 try!(self.print_ident(*ident));
1643 try!(self.word_space(":"));
1645 try!(self.head("for"));
1646 try!(self.print_pat(&**pat));
1647 try!(space(&mut self.s));
1648 try!(self.word_space("in"));
1649 try!(self.print_expr(&**iter));
1650 try!(space(&mut self.s));
1651 try!(self.print_block(&**blk));
1653 ast::ExprLoop(ref blk, opt_ident) => {
1654 for ident in opt_ident.iter() {
1655 try!(self.print_ident(*ident));
1656 try!(self.word_space(":"));
1658 try!(self.head("loop"));
1659 try!(space(&mut self.s));
1660 try!(self.print_block(&**blk));
1662 ast::ExprMatch(ref expr, ref arms, _) => {
1663 try!(self.cbox(indent_unit));
1665 try!(self.word_nbsp("match"));
1666 try!(self.print_expr(&**expr));
1667 try!(space(&mut self.s));
1669 for arm in arms.iter() {
1670 try!(self.print_arm(arm));
1672 try!(self.bclose_(expr.span, indent_unit));
1674 ast::ExprClosure(capture_clause, opt_kind, ref decl, ref body) => {
1675 try!(self.print_capture_clause(capture_clause));
1677 try!(self.print_fn_block_args(&**decl, opt_kind));
1678 try!(space(&mut self.s));
1680 if !body.stmts.is_empty() || !body.expr.is_some() {
1681 try!(self.print_block_unclosed(&**body));
1683 // we extract the block, so as not to create another set of boxes
1684 match body.expr.as_ref().unwrap().node {
1685 ast::ExprBlock(ref blk) => {
1686 try!(self.print_block_unclosed(&**blk));
1689 // this is a bare expression
1690 try!(self.print_expr(body.expr.as_ref().map(|e| &**e).unwrap()));
1691 try!(self.end()); // need to close a box
1695 // a box will be closed by print_expr, but we didn't want an overall
1696 // wrapper so we closed the corresponding opening. so create an
1697 // empty box to satisfy the close.
1700 ast::ExprBlock(ref blk) => {
1701 // containing cbox, will be closed by print-block at }
1702 try!(self.cbox(indent_unit));
1703 // head-box, will be closed by print-block after {
1704 try!(self.ibox(0u));
1705 try!(self.print_block(&**blk));
1707 ast::ExprAssign(ref lhs, ref rhs) => {
1708 try!(self.print_expr(&**lhs));
1709 try!(space(&mut self.s));
1710 try!(self.word_space("="));
1711 try!(self.print_expr(&**rhs));
1713 ast::ExprAssignOp(op, ref lhs, ref rhs) => {
1714 try!(self.print_expr(&**lhs));
1715 try!(space(&mut self.s));
1716 try!(word(&mut self.s, ast_util::binop_to_string(op)));
1717 try!(self.word_space("="));
1718 try!(self.print_expr(&**rhs));
1720 ast::ExprField(ref expr, id) => {
1721 try!(self.print_expr(&**expr));
1722 try!(word(&mut self.s, "."));
1723 try!(self.print_ident(id.node));
1725 ast::ExprTupField(ref expr, id) => {
1726 try!(self.print_expr(&**expr));
1727 try!(word(&mut self.s, "."));
1728 try!(self.print_uint(id.node));
1730 ast::ExprIndex(ref expr, ref index) => {
1731 try!(self.print_expr(&**expr));
1732 try!(word(&mut self.s, "["));
1733 try!(self.print_expr(&**index));
1734 try!(word(&mut self.s, "]"));
1736 ast::ExprRange(ref start, ref end) => {
1737 if let &Some(ref e) = start {
1738 try!(self.print_expr(&**e));
1740 if start.is_some() || end.is_some() {
1741 try!(word(&mut self.s, ".."));
1743 if let &Some(ref e) = end {
1744 try!(self.print_expr(&**e));
1747 ast::ExprPath(ref path) => try!(self.print_path(path, true)),
1748 ast::ExprBreak(opt_ident) => {
1749 try!(word(&mut self.s, "break"));
1750 try!(space(&mut self.s));
1751 for ident in opt_ident.iter() {
1752 try!(self.print_ident(*ident));
1753 try!(space(&mut self.s));
1756 ast::ExprAgain(opt_ident) => {
1757 try!(word(&mut self.s, "continue"));
1758 try!(space(&mut self.s));
1759 for ident in opt_ident.iter() {
1760 try!(self.print_ident(*ident));
1761 try!(space(&mut self.s))
1764 ast::ExprRet(ref result) => {
1765 try!(word(&mut self.s, "return"));
1768 try!(word(&mut self.s, " "));
1769 try!(self.print_expr(&**expr));
1774 ast::ExprInlineAsm(ref a) => {
1775 try!(word(&mut self.s, "asm!"));
1777 try!(self.print_string(a.asm.get(), a.asm_str_style));
1778 try!(self.word_space(":"));
1780 try!(self.commasep(Inconsistent, a.outputs[],
1781 |s, &(ref co, ref o, is_rw)| {
1782 match co.get().slice_shift_char() {
1783 Some(('=', operand)) if is_rw => {
1784 try!(s.print_string(format!("+{}", operand)[],
1787 _ => try!(s.print_string(co.get(), ast::CookedStr))
1790 try!(s.print_expr(&**o));
1794 try!(space(&mut self.s));
1795 try!(self.word_space(":"));
1797 try!(self.commasep(Inconsistent, a.inputs[],
1798 |s, &(ref co, ref o)| {
1799 try!(s.print_string(co.get(), ast::CookedStr));
1801 try!(s.print_expr(&**o));
1805 try!(space(&mut self.s));
1806 try!(self.word_space(":"));
1808 try!(self.commasep(Inconsistent, a.clobbers[],
1810 try!(s.print_string(co.get(), ast::CookedStr));
1814 let mut options = vec!();
1816 options.push("volatile");
1819 options.push("alignstack");
1821 if a.dialect == ast::AsmDialect::AsmIntel {
1822 options.push("intel");
1825 if options.len() > 0 {
1826 try!(space(&mut self.s));
1827 try!(self.word_space(":"));
1828 try!(self.commasep(Inconsistent, &*options,
1830 try!(s.print_string(co, ast::CookedStr));
1835 try!(self.pclose());
1837 ast::ExprMac(ref m) => try!(self.print_mac(m, token::Paren)),
1838 ast::ExprParen(ref e) => {
1840 try!(self.print_expr(&**e));
1841 try!(self.pclose());
1844 try!(self.ann.post(self, NodeExpr(expr)));
1848 pub fn print_local_decl(&mut self, loc: &ast::Local) -> IoResult<()> {
1849 try!(self.print_pat(&*loc.pat));
1850 if let Some(ref ty) = loc.ty {
1851 try!(self.word_space(":"));
1852 try!(self.print_type(&**ty));
1857 pub fn print_decl(&mut self, decl: &ast::Decl) -> IoResult<()> {
1858 try!(self.maybe_print_comment(decl.span.lo));
1860 ast::DeclLocal(ref loc) => {
1861 try!(self.space_if_not_bol());
1862 try!(self.ibox(indent_unit));
1863 try!(self.word_nbsp("let"));
1865 try!(self.ibox(indent_unit));
1866 try!(self.print_local_decl(&**loc));
1868 if let Some(ref init) = loc.init {
1870 try!(self.word_space("="));
1871 try!(self.print_expr(&**init));
1875 ast::DeclItem(ref item) => self.print_item(&**item)
1879 pub fn print_ident(&mut self, ident: ast::Ident) -> IoResult<()> {
1880 if self.encode_idents_with_hygiene {
1881 let encoded = ident.encode_with_hygiene();
1882 try!(word(&mut self.s, encoded[]))
1884 try!(word(&mut self.s, token::get_ident(ident).get()))
1886 self.ann.post(self, NodeIdent(&ident))
1889 pub fn print_uint(&mut self, i: uint) -> IoResult<()> {
1890 word(&mut self.s, i.to_string()[])
1893 pub fn print_name(&mut self, name: ast::Name) -> IoResult<()> {
1894 try!(word(&mut self.s, token::get_name(name).get()));
1895 self.ann.post(self, NodeName(&name))
1898 pub fn print_for_decl(&mut self, loc: &ast::Local,
1899 coll: &ast::Expr) -> IoResult<()> {
1900 try!(self.print_local_decl(loc));
1901 try!(space(&mut self.s));
1902 try!(self.word_space("in"));
1903 self.print_expr(coll)
1906 fn print_path(&mut self,
1908 colons_before_params: bool)
1911 try!(self.maybe_print_comment(path.span.lo));
1913 try!(word(&mut self.s, "::"));
1916 let mut first = true;
1917 for segment in path.segments.iter() {
1921 try!(word(&mut self.s, "::"))
1924 try!(self.print_ident(segment.identifier));
1926 try!(self.print_path_parameters(&segment.parameters, colons_before_params));
1932 fn print_path_parameters(&mut self,
1933 parameters: &ast::PathParameters,
1934 colons_before_params: bool)
1937 if parameters.is_empty() {
1941 if colons_before_params {
1942 try!(word(&mut self.s, "::"))
1946 ast::AngleBracketedParameters(ref data) => {
1947 try!(word(&mut self.s, "<"));
1949 let mut comma = false;
1950 for lifetime in data.lifetimes.iter() {
1952 try!(self.word_space(","))
1954 try!(self.print_lifetime(lifetime));
1958 if !data.types.is_empty() {
1960 try!(self.word_space(","))
1965 |s, ty| s.print_type(&**ty)));
1969 for binding in data.bindings.iter() {
1971 try!(self.word_space(","))
1973 try!(self.print_ident(binding.ident));
1974 try!(space(&mut self.s));
1975 try!(self.word_space("="));
1976 try!(self.print_type(&*binding.ty));
1980 try!(word(&mut self.s, ">"))
1983 ast::ParenthesizedParameters(ref data) => {
1984 try!(word(&mut self.s, "("));
1988 |s, ty| s.print_type(&**ty)));
1989 try!(word(&mut self.s, ")"));
1994 try!(self.space_if_not_bol());
1995 try!(self.word_space("->"));
1996 try!(self.print_type(&**ty));
2005 pub fn print_pat(&mut self, pat: &ast::Pat) -> IoResult<()> {
2006 try!(self.maybe_print_comment(pat.span.lo));
2007 try!(self.ann.pre(self, NodePat(pat)));
2008 /* Pat isn't normalized, but the beauty of it
2009 is that it doesn't matter */
2011 ast::PatWild(ast::PatWildSingle) => try!(word(&mut self.s, "_")),
2012 ast::PatWild(ast::PatWildMulti) => try!(word(&mut self.s, "..")),
2013 ast::PatIdent(binding_mode, ref path1, ref sub) => {
2014 match binding_mode {
2015 ast::BindByRef(mutbl) => {
2016 try!(self.word_nbsp("ref"));
2017 try!(self.print_mutability(mutbl));
2019 ast::BindByValue(ast::MutImmutable) => {}
2020 ast::BindByValue(ast::MutMutable) => {
2021 try!(self.word_nbsp("mut"));
2024 try!(self.print_ident(path1.node));
2027 try!(word(&mut self.s, "@"));
2028 try!(self.print_pat(&**p));
2033 ast::PatEnum(ref path, ref args_) => {
2034 try!(self.print_path(path, true));
2036 None => try!(word(&mut self.s, "(..)")),
2038 if !args.is_empty() {
2040 try!(self.commasep(Inconsistent, args[],
2041 |s, p| s.print_pat(&**p)));
2042 try!(self.pclose());
2047 ast::PatStruct(ref path, ref fields, etc) => {
2048 try!(self.print_path(path, true));
2050 try!(self.word_space("{"));
2051 try!(self.commasep_cmnt(
2052 Consistent, fields[],
2054 try!(s.cbox(indent_unit));
2055 if !f.node.is_shorthand {
2056 try!(s.print_ident(f.node.ident));
2057 try!(s.word_nbsp(":"));
2059 try!(s.print_pat(&*f.node.pat));
2062 |f| f.node.pat.span));
2064 if fields.len() != 0u { try!(self.word_space(",")); }
2065 try!(word(&mut self.s, ".."));
2067 try!(space(&mut self.s));
2068 try!(word(&mut self.s, "}"));
2070 ast::PatTup(ref elts) => {
2072 try!(self.commasep(Inconsistent,
2074 |s, p| s.print_pat(&**p)));
2075 if elts.len() == 1 {
2076 try!(word(&mut self.s, ","));
2078 try!(self.pclose());
2080 ast::PatBox(ref inner) => {
2081 try!(word(&mut self.s, "box "));
2082 try!(self.print_pat(&**inner));
2084 ast::PatRegion(ref inner) => {
2085 try!(word(&mut self.s, "&"));
2086 try!(self.print_pat(&**inner));
2088 ast::PatLit(ref e) => try!(self.print_expr(&**e)),
2089 ast::PatRange(ref begin, ref end) => {
2090 try!(self.print_expr(&**begin));
2091 try!(space(&mut self.s));
2092 try!(word(&mut self.s, "..."));
2093 try!(self.print_expr(&**end));
2095 ast::PatVec(ref before, ref slice, ref after) => {
2096 try!(word(&mut self.s, "["));
2097 try!(self.commasep(Inconsistent,
2099 |s, p| s.print_pat(&**p)));
2100 for p in slice.iter() {
2101 if !before.is_empty() { try!(self.word_space(",")); }
2102 try!(self.print_pat(&**p));
2104 ast::Pat { node: ast::PatWild(ast::PatWildMulti), .. } => {
2105 // this case is handled by print_pat
2107 _ => try!(word(&mut self.s, "..")),
2109 if !after.is_empty() { try!(self.word_space(",")); }
2111 try!(self.commasep(Inconsistent,
2113 |s, p| s.print_pat(&**p)));
2114 try!(word(&mut self.s, "]"));
2116 ast::PatMac(ref m) => try!(self.print_mac(m, token::Paren)),
2118 self.ann.post(self, NodePat(pat))
2121 fn print_arm(&mut self, arm: &ast::Arm) -> IoResult<()> {
2122 // I have no idea why this check is necessary, but here it
2124 if arm.attrs.is_empty() {
2125 try!(space(&mut self.s));
2127 try!(self.cbox(indent_unit));
2128 try!(self.ibox(0u));
2129 try!(self.print_outer_attributes(arm.attrs[]));
2130 let mut first = true;
2131 for p in arm.pats.iter() {
2135 try!(space(&mut self.s));
2136 try!(self.word_space("|"));
2138 try!(self.print_pat(&**p));
2140 try!(space(&mut self.s));
2141 if let Some(ref e) = arm.guard {
2142 try!(self.word_space("if"));
2143 try!(self.print_expr(&**e));
2144 try!(space(&mut self.s));
2146 try!(self.word_space("=>"));
2148 match arm.body.node {
2149 ast::ExprBlock(ref blk) => {
2150 // the block will close the pattern's ibox
2151 try!(self.print_block_unclosed_indent(&**blk, indent_unit));
2153 // If it is a user-provided unsafe block, print a comma after it
2154 if let ast::UnsafeBlock(ast::UserProvided) = blk.rules {
2155 try!(word(&mut self.s, ","));
2159 try!(self.end()); // close the ibox for the pattern
2160 try!(self.print_expr(&*arm.body));
2161 try!(word(&mut self.s, ","));
2164 self.end() // close enclosing cbox
2167 // Returns whether it printed anything
2168 fn print_explicit_self(&mut self,
2169 explicit_self: &ast::ExplicitSelf_,
2170 mutbl: ast::Mutability) -> IoResult<bool> {
2171 try!(self.print_mutability(mutbl));
2172 match *explicit_self {
2173 ast::SelfStatic => { return Ok(false); }
2174 ast::SelfValue(_) => {
2175 try!(word(&mut self.s, "self"));
2177 ast::SelfRegion(ref lt, m, _) => {
2178 try!(word(&mut self.s, "&"));
2179 try!(self.print_opt_lifetime(lt));
2180 try!(self.print_mutability(m));
2181 try!(word(&mut self.s, "self"));
2183 ast::SelfExplicit(ref typ, _) => {
2184 try!(word(&mut self.s, "self"));
2185 try!(self.word_space(":"));
2186 try!(self.print_type(&**typ));
2192 pub fn print_fn(&mut self,
2194 unsafety: Option<ast::Unsafety>,
2197 generics: &ast::Generics,
2198 opt_explicit_self: Option<&ast::ExplicitSelf_>,
2199 vis: ast::Visibility) -> IoResult<()> {
2200 try!(self.head(""));
2201 try!(self.print_fn_header_info(opt_explicit_self, unsafety, abi, vis));
2203 try!(self.print_ident(name));
2204 try!(self.print_generics(generics));
2205 try!(self.print_fn_args_and_ret(decl, opt_explicit_self));
2206 self.print_where_clause(generics)
2209 pub fn print_fn_args(&mut self, decl: &ast::FnDecl,
2210 opt_explicit_self: Option<&ast::ExplicitSelf_>)
2212 // It is unfortunate to duplicate the commasep logic, but we want the
2213 // self type and the args all in the same box.
2214 try!(self.rbox(0u, Inconsistent));
2215 let mut first = true;
2216 for &explicit_self in opt_explicit_self.iter() {
2217 let m = match explicit_self {
2218 &ast::SelfStatic => ast::MutImmutable,
2219 _ => match decl.inputs[0].pat.node {
2220 ast::PatIdent(ast::BindByValue(m), _, _) => m,
2221 _ => ast::MutImmutable
2224 first = !try!(self.print_explicit_self(explicit_self, m));
2227 // HACK(eddyb) ignore the separately printed self argument.
2228 let args = if first {
2231 decl.inputs.slice_from(1)
2234 for arg in args.iter() {
2235 if first { first = false; } else { try!(self.word_space(",")); }
2236 try!(self.print_arg(arg));
2242 pub fn print_fn_args_and_ret(&mut self, decl: &ast::FnDecl,
2243 opt_explicit_self: Option<&ast::ExplicitSelf_>)
2246 try!(self.print_fn_args(decl, opt_explicit_self));
2248 try!(word(&mut self.s, ", ..."));
2250 try!(self.pclose());
2252 self.print_fn_output(decl)
2255 pub fn print_fn_block_args(
2258 unboxed_closure_kind: Option<UnboxedClosureKind>)
2260 try!(word(&mut self.s, "|"));
2261 match unboxed_closure_kind {
2263 Some(FnUnboxedClosureKind) => try!(self.word_space("&:")),
2264 Some(FnMutUnboxedClosureKind) => try!(self.word_space("&mut:")),
2265 Some(FnOnceUnboxedClosureKind) => try!(self.word_space(":")),
2267 try!(self.print_fn_args(decl, None));
2268 try!(word(&mut self.s, "|"));
2270 if let ast::Return(ref ty) = decl.output {
2271 if ty.node == ast::TyInfer {
2272 return self.maybe_print_comment(ty.span.lo);
2276 try!(self.space_if_not_bol());
2277 try!(self.word_space("->"));
2279 ast::Return(ref ty) => {
2280 try!(self.print_type(&**ty));
2281 self.maybe_print_comment(ty.span.lo)
2283 ast::NoReturn(span) => {
2284 try!(self.word_nbsp("!"));
2285 self.maybe_print_comment(span.lo)
2290 pub fn print_capture_clause(&mut self, capture_clause: ast::CaptureClause)
2292 match capture_clause {
2293 ast::CaptureByValue => self.word_space("move"),
2294 ast::CaptureByRef => Ok(()),
2298 pub fn print_proc_args(&mut self, decl: &ast::FnDecl) -> IoResult<()> {
2299 try!(word(&mut self.s, "proc"));
2300 try!(word(&mut self.s, "("));
2301 try!(self.print_fn_args(decl, None));
2302 try!(word(&mut self.s, ")"));
2304 if let ast::Return(ref ty) = decl.output {
2305 if ty.node == ast::TyInfer {
2306 return self.maybe_print_comment(ty.span.lo);
2310 try!(self.space_if_not_bol());
2311 try!(self.word_space("->"));
2313 ast::Return(ref ty) => {
2314 try!(self.print_type(&**ty));
2315 self.maybe_print_comment(ty.span.lo)
2317 ast::NoReturn(span) => {
2318 try!(self.word_nbsp("!"));
2319 self.maybe_print_comment(span.lo)
2324 pub fn print_bounds(&mut self,
2326 bounds: &[ast::TyParamBound])
2328 if !bounds.is_empty() {
2329 try!(word(&mut self.s, prefix));
2330 let mut first = true;
2331 for bound in bounds.iter() {
2336 try!(self.word_space("+"));
2340 TraitTyParamBound(ref tref, TraitBoundModifier::None) => {
2341 self.print_poly_trait_ref(tref)
2343 TraitTyParamBound(ref tref, TraitBoundModifier::Maybe) => {
2344 try!(word(&mut self.s, "?"));
2345 self.print_poly_trait_ref(tref)
2347 RegionTyParamBound(ref lt) => {
2348 self.print_lifetime(lt)
2358 pub fn print_lifetime(&mut self,
2359 lifetime: &ast::Lifetime)
2362 self.print_name(lifetime.name)
2365 pub fn print_lifetime_def(&mut self,
2366 lifetime: &ast::LifetimeDef)
2369 try!(self.print_lifetime(&lifetime.lifetime));
2371 for v in lifetime.bounds.iter() {
2372 try!(word(&mut self.s, sep));
2373 try!(self.print_lifetime(v));
2379 pub fn print_generics(&mut self,
2380 generics: &ast::Generics)
2383 let total = generics.lifetimes.len() + generics.ty_params.len();
2388 try!(word(&mut self.s, "<"));
2390 let mut ints = Vec::new();
2391 for i in range(0u, total) {
2395 try!(self.commasep(Inconsistent, ints[], |s, &idx| {
2396 if idx < generics.lifetimes.len() {
2397 let lifetime = &generics.lifetimes[idx];
2398 s.print_lifetime_def(lifetime)
2400 let idx = idx - generics.lifetimes.len();
2401 let param = &generics.ty_params[idx];
2402 s.print_ty_param(param)
2406 try!(word(&mut self.s, ">"));
2410 pub fn print_ty_param(&mut self, param: &ast::TyParam) -> IoResult<()> {
2411 try!(self.print_ident(param.ident));
2412 try!(self.print_bounds(":", param.bounds[]));
2413 match param.default {
2414 Some(ref default) => {
2415 try!(space(&mut self.s));
2416 try!(self.word_space("="));
2417 self.print_type(&**default)
2423 pub fn print_where_clause(&mut self, generics: &ast::Generics)
2425 if generics.where_clause.predicates.len() == 0 {
2429 try!(space(&mut self.s));
2430 try!(self.word_space("where"));
2432 for (i, predicate) in generics.where_clause
2437 try!(self.word_space(","));
2441 &ast::WherePredicate::BoundPredicate(ast::WhereBoundPredicate{ref bounded_ty,
2444 try!(self.print_type(&**bounded_ty));
2445 try!(self.print_bounds(":", bounds.as_slice()));
2447 &ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate{ref lifetime,
2450 try!(self.print_lifetime(lifetime));
2451 try!(word(&mut self.s, ":"));
2453 for (i, bound) in bounds.iter().enumerate() {
2454 try!(self.print_lifetime(bound));
2457 try!(word(&mut self.s, ":"));
2461 &ast::WherePredicate::EqPredicate(ast::WhereEqPredicate{ref path, ref ty, ..}) => {
2462 try!(self.print_path(path, false));
2463 try!(space(&mut self.s));
2464 try!(self.word_space("="));
2465 try!(self.print_type(&**ty));
2473 pub fn print_meta_item(&mut self, item: &ast::MetaItem) -> IoResult<()> {
2474 try!(self.ibox(indent_unit));
2476 ast::MetaWord(ref name) => {
2477 try!(word(&mut self.s, name.get()));
2479 ast::MetaNameValue(ref name, ref value) => {
2480 try!(self.word_space(name.get()));
2481 try!(self.word_space("="));
2482 try!(self.print_literal(value));
2484 ast::MetaList(ref name, ref items) => {
2485 try!(word(&mut self.s, name.get()));
2487 try!(self.commasep(Consistent,
2489 |s, i| s.print_meta_item(&**i)));
2490 try!(self.pclose());
2496 pub fn print_view_path(&mut self, vp: &ast::ViewPath) -> IoResult<()> {
2498 ast::ViewPathSimple(ident, ref path, _) => {
2499 try!(self.print_path(path, false));
2501 // FIXME(#6993) can't compare identifiers directly here
2502 if path.segments.last().unwrap().identifier.name !=
2504 try!(space(&mut self.s));
2505 try!(self.word_space("as"));
2506 try!(self.print_ident(ident));
2512 ast::ViewPathGlob(ref path, _) => {
2513 try!(self.print_path(path, false));
2514 word(&mut self.s, "::*")
2517 ast::ViewPathList(ref path, ref idents, _) => {
2518 if path.segments.is_empty() {
2519 try!(word(&mut self.s, "{"));
2521 try!(self.print_path(path, false));
2522 try!(word(&mut self.s, "::{"));
2524 try!(self.commasep(Inconsistent, idents[], |s, w| {
2526 ast::PathListIdent { name, .. } => {
2529 ast::PathListMod { .. } => {
2530 word(&mut s.s, "self")
2534 word(&mut self.s, "}")
2539 pub fn print_view_item(&mut self, item: &ast::ViewItem) -> IoResult<()> {
2540 try!(self.hardbreak_if_not_bol());
2541 try!(self.maybe_print_comment(item.span.lo));
2542 try!(self.print_outer_attributes(item.attrs[]));
2543 try!(self.print_visibility(item.vis));
2545 ast::ViewItemExternCrate(id, ref optional_path, _) => {
2546 try!(self.head("extern crate"));
2547 for &(ref p, style) in optional_path.iter() {
2548 try!(self.print_string(p.get(), style));
2549 try!(space(&mut self.s));
2550 try!(word(&mut self.s, "as"));
2551 try!(space(&mut self.s));
2553 try!(self.print_ident(id));
2556 ast::ViewItemUse(ref vp) => {
2557 try!(self.head("use"));
2558 try!(self.print_view_path(&**vp));
2561 try!(word(&mut self.s, ";"));
2562 try!(self.end()); // end inner head-block
2563 self.end() // end outer head-block
2566 pub fn print_mutability(&mut self,
2567 mutbl: ast::Mutability) -> IoResult<()> {
2569 ast::MutMutable => self.word_nbsp("mut"),
2570 ast::MutImmutable => Ok(()),
2574 pub fn print_mt(&mut self, mt: &ast::MutTy) -> IoResult<()> {
2575 try!(self.print_mutability(mt.mutbl));
2576 self.print_type(&*mt.ty)
2579 pub fn print_arg(&mut self, input: &ast::Arg) -> IoResult<()> {
2580 try!(self.ibox(indent_unit));
2581 match input.ty.node {
2582 ast::TyInfer => try!(self.print_pat(&*input.pat)),
2584 match input.pat.node {
2585 ast::PatIdent(_, ref path1, _) if
2587 parse::token::special_idents::invalid.name => {
2591 try!(self.print_pat(&*input.pat));
2592 try!(word(&mut self.s, ":"));
2593 try!(space(&mut self.s));
2596 try!(self.print_type(&*input.ty));
2602 pub fn print_fn_output(&mut self, decl: &ast::FnDecl) -> IoResult<()> {
2603 if let ast::Return(ref ty) = decl.output {
2605 ast::TyTup(ref tys) if tys.is_empty() => {
2606 return self.maybe_print_comment(ty.span.lo);
2612 try!(self.space_if_not_bol());
2613 try!(self.ibox(indent_unit));
2614 try!(self.word_space("->"));
2617 try!(self.word_nbsp("!")),
2618 ast::Return(ref ty) =>
2619 try!(self.print_type(&**ty))
2624 ast::Return(ref output) => self.maybe_print_comment(output.span.lo),
2629 pub fn print_ty_fn(&mut self,
2630 opt_abi: Option<abi::Abi>,
2631 opt_sigil: Option<char>,
2632 unsafety: ast::Unsafety,
2633 onceness: ast::Onceness,
2635 id: Option<ast::Ident>,
2636 bounds: &OwnedSlice<ast::TyParamBound>,
2637 generics: Option<&ast::Generics>,
2638 opt_explicit_self: Option<&ast::ExplicitSelf_>)
2640 try!(self.ibox(indent_unit));
2642 // Duplicates the logic in `print_fn_header_info()`. This is because that
2643 // function prints the sigil in the wrong place. That should be fixed.
2644 if opt_sigil == Some('~') && onceness == ast::Once {
2645 try!(word(&mut self.s, "proc"));
2646 } else if opt_sigil == Some('&') {
2647 try!(self.print_unsafety(unsafety));
2648 try!(self.print_extern_opt_abi(opt_abi));
2650 assert!(opt_sigil.is_none());
2651 try!(self.print_unsafety(unsafety));
2652 try!(self.print_opt_abi_and_extern_if_nondefault(opt_abi));
2653 try!(word(&mut self.s, "fn"));
2658 try!(word(&mut self.s, " "));
2659 try!(self.print_ident(id));
2664 match generics { Some(g) => try!(self.print_generics(g)), _ => () }
2665 try!(zerobreak(&mut self.s));
2667 if opt_sigil == Some('&') {
2668 try!(word(&mut self.s, "|"));
2673 try!(self.print_fn_args(decl, opt_explicit_self));
2675 if opt_sigil == Some('&') {
2676 try!(word(&mut self.s, "|"));
2679 try!(word(&mut self.s, ", ..."));
2681 try!(self.pclose());
2684 try!(self.print_bounds(":", bounds[]));
2686 try!(self.print_fn_output(decl));
2689 Some(generics) => try!(self.print_where_clause(generics)),
2696 pub fn maybe_print_trailing_comment(&mut self, span: codemap::Span,
2697 next_pos: Option<BytePos>)
2699 let cm = match self.cm {
2703 match self.next_comment() {
2705 if (*cmnt).style != comments::Trailing { return Ok(()) }
2706 let span_line = cm.lookup_char_pos(span.hi);
2707 let comment_line = cm.lookup_char_pos((*cmnt).pos);
2708 let mut next = (*cmnt).pos + BytePos(1);
2709 match next_pos { None => (), Some(p) => next = p }
2710 if span.hi < (*cmnt).pos && (*cmnt).pos < next &&
2711 span_line.line == comment_line.line {
2712 try!(self.print_comment(cmnt));
2713 self.cur_cmnt_and_lit.cur_cmnt += 1u;
2721 pub fn print_remaining_comments(&mut self) -> IoResult<()> {
2722 // If there aren't any remaining comments, then we need to manually
2723 // make sure there is a line break at the end.
2724 if self.next_comment().is_none() {
2725 try!(hardbreak(&mut self.s));
2728 match self.next_comment() {
2730 try!(self.print_comment(cmnt));
2731 self.cur_cmnt_and_lit.cur_cmnt += 1u;
2739 pub fn print_literal(&mut self, lit: &ast::Lit) -> IoResult<()> {
2740 try!(self.maybe_print_comment(lit.span.lo));
2741 match self.next_lit(lit.span.lo) {
2743 return word(&mut self.s, (*ltrl).lit[]);
2748 ast::LitStr(ref st, style) => self.print_string(st.get(), style),
2749 ast::LitByte(byte) => {
2750 let mut res = String::from_str("b'");
2751 ascii::escape_default(byte, |c| res.push(c as char));
2753 word(&mut self.s, res[])
2755 ast::LitChar(ch) => {
2756 let mut res = String::from_str("'");
2757 for c in ch.escape_default() {
2761 word(&mut self.s, res[])
2763 ast::LitInt(i, t) => {
2765 ast::SignedIntLit(st, ast::Plus) => {
2767 ast_util::int_ty_to_string(st, Some(i as i64))[])
2769 ast::SignedIntLit(st, ast::Minus) => {
2770 let istr = ast_util::int_ty_to_string(st, Some(-(i as i64)));
2772 format!("-{}", istr)[])
2774 ast::UnsignedIntLit(ut) => {
2775 word(&mut self.s, ast_util::uint_ty_to_string(ut, Some(i))[])
2777 ast::UnsuffixedIntLit(ast::Plus) => {
2778 word(&mut self.s, format!("{}", i)[])
2780 ast::UnsuffixedIntLit(ast::Minus) => {
2781 word(&mut self.s, format!("-{}", i)[])
2785 ast::LitFloat(ref f, t) => {
2790 ast_util::float_ty_to_string(t)[])[])
2792 ast::LitFloatUnsuffixed(ref f) => word(&mut self.s, f.get()),
2793 ast::LitBool(val) => {
2794 if val { word(&mut self.s, "true") } else { word(&mut self.s, "false") }
2796 ast::LitBinary(ref v) => {
2797 let mut escaped: String = String::new();
2798 for &ch in v.iter() {
2799 ascii::escape_default(ch as u8,
2800 |ch| escaped.push(ch as char));
2802 word(&mut self.s, format!("b\"{}\"", escaped)[])
2807 pub fn next_lit(&mut self, pos: BytePos) -> Option<comments::Literal> {
2808 match self.literals {
2810 while self.cur_cmnt_and_lit.cur_lit < lits.len() {
2811 let ltrl = (*lits)[self.cur_cmnt_and_lit.cur_lit].clone();
2812 if ltrl.pos > pos { return None; }
2813 self.cur_cmnt_and_lit.cur_lit += 1u;
2814 if ltrl.pos == pos { return Some(ltrl); }
2822 pub fn maybe_print_comment(&mut self, pos: BytePos) -> IoResult<()> {
2824 match self.next_comment() {
2826 if (*cmnt).pos < pos {
2827 try!(self.print_comment(cmnt));
2828 self.cur_cmnt_and_lit.cur_cmnt += 1u;
2837 pub fn print_comment(&mut self,
2838 cmnt: &comments::Comment) -> IoResult<()> {
2840 comments::Mixed => {
2841 assert_eq!(cmnt.lines.len(), 1u);
2842 try!(zerobreak(&mut self.s));
2843 try!(word(&mut self.s, cmnt.lines[0][]));
2844 zerobreak(&mut self.s)
2846 comments::Isolated => {
2847 try!(self.hardbreak_if_not_bol());
2848 for line in cmnt.lines.iter() {
2849 // Don't print empty lines because they will end up as trailing
2851 if !line.is_empty() {
2852 try!(word(&mut self.s, line[]));
2854 try!(hardbreak(&mut self.s));
2858 comments::Trailing => {
2859 try!(word(&mut self.s, " "));
2860 if cmnt.lines.len() == 1u {
2861 try!(word(&mut self.s, cmnt.lines[0][]));
2862 hardbreak(&mut self.s)
2864 try!(self.ibox(0u));
2865 for line in cmnt.lines.iter() {
2866 if !line.is_empty() {
2867 try!(word(&mut self.s, line[]));
2869 try!(hardbreak(&mut self.s));
2874 comments::BlankLine => {
2875 // We need to do at least one, possibly two hardbreaks.
2876 let is_semi = match self.s.last_token() {
2877 pp::String(s, _) => ";" == s,
2880 if is_semi || self.is_begin() || self.is_end() {
2881 try!(hardbreak(&mut self.s));
2883 hardbreak(&mut self.s)
2888 pub fn print_string(&mut self, st: &str,
2889 style: ast::StrStyle) -> IoResult<()> {
2890 let st = match style {
2892 (format!("\"{}\"", st.escape_default()))
2895 (format!("r{delim}\"{string}\"{delim}",
2896 delim=repeat("#", n),
2900 word(&mut self.s, st[])
2903 pub fn next_comment(&mut self) -> Option<comments::Comment> {
2904 match self.comments {
2905 Some(ref cmnts) => {
2906 if self.cur_cmnt_and_lit.cur_cmnt < cmnts.len() {
2907 Some(cmnts[self.cur_cmnt_and_lit.cur_cmnt].clone())
2916 pub fn print_opt_unsafety(&mut self,
2917 opt_unsafety: Option<ast::Unsafety>) -> IoResult<()> {
2918 match opt_unsafety {
2919 Some(unsafety) => self.print_unsafety(unsafety),
2924 pub fn print_opt_abi_and_extern_if_nondefault(&mut self,
2925 opt_abi: Option<abi::Abi>)
2928 Some(abi::Rust) => Ok(()),
2930 try!(self.word_nbsp("extern"));
2931 self.word_nbsp(abi.to_string()[])
2937 pub fn print_extern_opt_abi(&mut self,
2938 opt_abi: Option<abi::Abi>) -> IoResult<()> {
2941 try!(self.word_nbsp("extern"));
2942 self.word_nbsp(abi.to_string()[])
2948 pub fn print_fn_header_info(&mut self,
2949 _opt_explicit_self: Option<&ast::ExplicitSelf_>,
2950 opt_unsafety: Option<ast::Unsafety>,
2952 vis: ast::Visibility) -> IoResult<()> {
2953 try!(word(&mut self.s, visibility_qualified(vis, "").as_slice()));
2954 try!(self.print_opt_unsafety(opt_unsafety));
2956 if abi != abi::Rust {
2957 try!(self.word_nbsp("extern"));
2958 try!(self.word_nbsp(abi.to_string()[]));
2961 word(&mut self.s, "fn")
2964 pub fn print_unsafety(&mut self, s: ast::Unsafety) -> IoResult<()> {
2966 ast::Unsafety::Normal => Ok(()),
2967 ast::Unsafety::Unsafe => self.word_nbsp("unsafe"),
2972 fn repeat(s: &str, n: uint) -> String { iter::repeat(s).take(n).collect() }
2985 fn test_fun_to_string() {
2986 let abba_ident = token::str_to_ident("abba");
2988 let decl = ast::FnDecl {
2990 output: ast::Return(P(ast::Ty {id: 0,
2991 node: ast::TyTup(vec![]),
2992 span: codemap::DUMMY_SP})),
2995 let generics = ast_util::empty_generics();
2996 assert_eq!(fun_to_string(&decl, ast::Unsafety::Normal, abba_ident,
3002 fn test_variant_to_string() {
3003 let ident = token::str_to_ident("principal_skinner");
3005 let var = codemap::respan(codemap::DUMMY_SP, ast::Variant_ {
3008 // making this up as I go.... ?
3009 kind: ast::TupleVariantKind(Vec::new()),
3015 let varstr = variant_to_string(&var);
3016 assert_eq!(varstr, "pub principal_skinner");
3020 fn test_signed_int_to_string() {
3021 let pos_int = ast::LitInt(42, ast::SignedIntLit(ast::TyI32, ast::Plus));
3022 let neg_int = ast::LitInt((-42) as u64, ast::SignedIntLit(ast::TyI32, ast::Minus));
3023 assert_eq!(format!("-{}", lit_to_string(&codemap::dummy_spanned(pos_int))),
3024 lit_to_string(&codemap::dummy_spanned(neg_int)));