6 import std::option::some;
7 import std::option::none;
9 import std::either::left;
10 import std::either::right;
11 import std::map::hashmap;
12 import token::can_begin_expr;
13 import ex = ext::base;
15 import std::map::new_str_hash;
16 import util::interner;
20 tag restriction { UNRESTRICTED; RESTRICT_NO_CALL_EXPRS; }
22 tag file_type { CRATE_FILE; SOURCE_FILE; }
24 tag ty_or_bang { a_ty(@ast::ty); a_bang; }
26 type parse_sess = @{cm: codemap::codemap, mutable next_id: node_id};
28 fn next_node_id(sess: &parse_sess) -> node_id {
29 let rv = sess.next_id;
36 fn peek() -> token::token;
38 fn swap(token::token, uint, uint);
39 fn look_ahead(uint) -> token::token;
42 fn restrict(restriction);
43 fn get_restriction() -> restriction;
44 fn get_file_type() -> file_type;
45 fn get_cfg() -> ast::crate_cfg;
46 fn get_span() -> span;
47 fn get_lo_pos() -> uint;
48 fn get_hi_pos() -> uint;
49 fn get_last_lo_pos() -> uint;
50 fn get_last_hi_pos() -> uint;
51 fn get_prec_table() -> @[op_spec];
52 fn get_str(token::str_num) -> str;
53 fn get_reader() -> lexer::reader;
54 fn get_filemap() -> codemap::filemap;
55 fn get_bad_expr_words() -> hashmap<str, ()>;
56 fn get_chpos() -> uint;
57 fn get_byte_pos() -> uint;
58 fn get_id() -> node_id;
59 fn get_sess() -> parse_sess;
62 fn new_parser_from_file(sess: parse_sess, cfg: &ast::crate_cfg, path: &str,
63 chpos: uint, byte_pos: uint, ftype: file_type) ->
65 let src = io::read_whole_file_str(path);
66 let filemap = codemap::new_filemap(path, chpos, byte_pos);
67 sess.cm.files += [filemap];
68 let itr = @interner::mk(str::hash, str::eq);
69 let rdr = lexer::new_reader(sess.cm, src, filemap, itr);
70 ret new_parser(sess, cfg, rdr, ftype);
73 fn new_parser(sess: parse_sess, cfg: &ast::crate_cfg, rdr: lexer::reader,
74 ftype: file_type) -> parser {
75 obj stdio_parser(sess: parse_sess,
78 mutable tok: token::token,
79 mutable tok_span: span,
80 mutable last_tok_span: span,
81 mutable buffer: [{tok: token::token, span: span}],
82 mutable restr: restriction,
85 bad_words: hashmap<str, ()>) {
86 fn peek() -> token::token { ret tok; }
88 last_tok_span = tok_span;
89 if vec::len(buffer) == 0u {
90 let next = lexer::next_token(rdr);
92 tok_span = ast_util::mk_sp(next.chpos, rdr.get_chpos());
94 let next = vec::pop(buffer);
99 fn swap(next: token::token, lo: uint, hi: uint) {
101 tok_span = ast_util::mk_sp(lo, hi);
103 fn look_ahead(distance: uint) -> token::token {
104 while vec::len(buffer) < distance {
105 let next = lexer::next_token(rdr);
106 let sp = ast_util::mk_sp(next.chpos, rdr.get_chpos());
107 buffer = [{tok: next.tok, span: sp}] + buffer;
109 ret buffer[distance - 1u].tok;
111 fn fatal(m: &str) -> ! {
112 codemap::emit_error(some(self.get_span()), m, sess.cm);
116 codemap::emit_warning(some(self.get_span()), m, sess.cm);
118 fn restrict(r: restriction) { restr = r; }
119 fn get_restriction() -> restriction { ret restr; }
120 fn get_span() -> span { ret tok_span; }
121 fn get_lo_pos() -> uint { ret tok_span.lo; }
122 fn get_hi_pos() -> uint { ret tok_span.hi; }
123 fn get_last_lo_pos() -> uint { ret last_tok_span.lo; }
124 fn get_last_hi_pos() -> uint { ret last_tok_span.hi; }
125 fn get_file_type() -> file_type { ret ftype; }
126 fn get_cfg() -> ast::crate_cfg { ret cfg; }
127 fn get_prec_table() -> @[op_spec] { ret precs; }
128 fn get_str(i: token::str_num) -> str {
129 ret interner::get(*rdr.get_interner(), i);
131 fn get_reader() -> lexer::reader { ret rdr; }
132 fn get_filemap() -> codemap::filemap { ret rdr.get_filemap(); }
133 fn get_bad_expr_words() -> hashmap<str, ()> { ret bad_words; }
134 fn get_chpos() -> uint { ret rdr.get_chpos(); }
135 fn get_byte_pos() -> uint { ret rdr.get_byte_pos(); }
136 fn get_id() -> node_id { ret next_node_id(sess); }
137 fn get_sess() -> parse_sess { ret sess; }
139 let tok0 = lexer::next_token(rdr);
140 let span0 = ast_util::mk_sp(tok0.chpos, rdr.get_chpos());
141 ret stdio_parser(sess, cfg, ftype, tok0.tok, span0, span0, [],
142 UNRESTRICTED, rdr, prec_table(), bad_expr_word_table());
145 // These are the words that shouldn't be allowed as value identifiers,
146 // because, if used at the start of a line, they will cause the line to be
147 // interpreted as a specific kind of statement, which would be confusing.
148 fn bad_expr_word_table() -> hashmap<str, ()> {
149 let words = new_str_hash();
150 words.insert("mod", ());
151 words.insert("if", ());
152 words.insert("else", ());
153 words.insert("while", ());
154 words.insert("do", ());
155 words.insert("alt", ());
156 words.insert("for", ());
157 words.insert("each", ());
158 words.insert("break", ());
159 words.insert("cont", ());
160 words.insert("put", ());
161 words.insert("ret", ());
162 words.insert("be", ());
163 words.insert("fail", ());
164 words.insert("type", ());
165 words.insert("resource", ());
166 words.insert("check", ());
167 words.insert("assert", ());
168 words.insert("claim", ());
169 words.insert("prove", ());
170 words.insert("native", ());
171 words.insert("fn", ());
172 words.insert("lambda", ());
173 words.insert("pure", ());
174 words.insert("iter", ());
175 words.insert("block", ());
176 words.insert("import", ());
177 words.insert("export", ());
178 words.insert("let", ());
179 words.insert("const", ());
180 words.insert("log", ());
181 words.insert("log_err", ());
182 words.insert("tag", ());
183 words.insert("obj", ());
184 words.insert("copy", ());
188 fn unexpected(p: &parser, t: token::token) -> ! {
189 let s: str = "unexpected token: ";
190 s += token::to_str(p.get_reader(), t);
194 fn expect(p: &parser, t: token::token) {
198 let s: str = "expecting ";
199 s += token::to_str(p.get_reader(), t);
201 s += token::to_str(p.get_reader(), p.peek());
206 fn expect_gt(p: &parser) {
207 if p.peek() == token::GT {
209 } else if p.peek() == token::BINOP(token::LSR) {
210 p.swap(token::GT, p.get_lo_pos() + 1u, p.get_hi_pos());
211 } else if p.peek() == token::BINOP(token::ASR) {
212 p.swap(token::BINOP(token::LSR), p.get_lo_pos() + 1u, p.get_hi_pos());
214 let s: str = "expecting ";
215 s += token::to_str(p.get_reader(), token::GT);
217 s += token::to_str(p.get_reader(), p.peek());
222 fn spanned<@T>(lo: uint, hi: uint, node: &T) -> spanned<T> {
223 ret {node: node, span: ast_util::mk_sp(lo, hi)};
226 fn parse_ident(p: &parser) -> ast::ident {
228 token::IDENT(i, _) { p.bump(); ret p.get_str(i); }
229 _ { p.fatal("expecting ident"); }
233 fn parse_value_ident(p: &parser) -> ast::ident {
238 fn eat(p: &parser, tok: &token::token) -> bool {
239 ret if p.peek() == tok { p.bump(); true } else { false };
242 fn is_word(p: &parser, word: &str) -> bool {
244 token::IDENT(sid, false) { str::eq(word, p.get_str(sid)) }
249 fn eat_word(p: &parser, word: &str) -> bool {
251 token::IDENT(sid, false) {
252 if str::eq(word, p.get_str(sid)) {
255 } else { ret false; }
261 fn expect_word(p: &parser, word: &str) {
262 if !eat_word(p, word) {
263 p.fatal("expecting " + word + ", found " +
264 token::to_str(p.get_reader(), p.peek()));
268 fn check_bad_word(p: &parser) {
270 token::IDENT(sid, false) {
271 let w = p.get_str(sid);
272 if p.get_bad_expr_words().contains_key(w) {
273 p.fatal("found " + w + " in expression position");
280 fn parse_ty_fn(proto: ast::proto, p: &parser) -> ast::ty_ {
281 fn parse_fn_input_ty(p: &parser) -> ast::ty_arg {
282 let lo = p.get_lo_pos();
283 // Ignore arg name, if present
284 if is_plain_ident(p) && p.look_ahead(1u) == token::COLON {
289 if p.peek() == token::BINOP(token::AND) {
291 mode = ast::alias(eat_word(p, "mutable"));
293 let t = parse_ty(p, false);
294 ret spanned(lo, t.span.hi, {mode: mode, ty: t});
296 let lo = p.get_lo_pos();
298 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
299 parse_fn_input_ty, p);
300 // FIXME: there's no syntax for this right now anyway
301 // auto constrs = parse_constrs(~[], p);
302 let constrs: [@ast::constr] = [];
303 let output: @ast::ty;
304 let cf = ast::return;
305 if p.peek() == token::RARROW {
307 let tmp = parse_ty_or_bang(p);
309 a_ty(t) { output = t; }
311 output = @spanned(lo, inputs.span.hi, ast::ty_bot);
315 } else { output = @spanned(lo, inputs.span.hi, ast::ty_nil); }
316 ret ast::ty_fn(proto, inputs.node, output, cf, constrs);
319 fn parse_proto(p: &parser) -> ast::proto {
320 if eat_word(p, "iter") {
322 } else if eat_word(p, "fn") {
324 } else if eat_word(p, "block") {
325 ret ast::proto_block;
326 } else { unexpected(p, p.peek()); }
329 fn parse_ty_obj(p: &parser, hi: &mutable uint) -> ast::ty_ {
330 fn parse_method_sig(p: &parser) -> ast::ty_method {
331 let flo = p.get_lo_pos();
332 let proto: ast::proto = parse_proto(p);
333 let ident = parse_value_ident(p);
334 let f = parse_ty_fn(proto, p);
335 expect(p, token::SEMI);
337 ast::ty_fn(proto, inputs, output, cf, constrs) {
338 ret spanned(flo, output.span.hi,
349 parse_seq(token::LBRACE, token::RBRACE, none, parse_method_sig, p);
351 ret ast::ty_obj(meths.node);
354 fn parse_mt(p: &parser) -> ast::mt {
355 let mut = parse_mutability(p);
356 let t = parse_ty(p, false);
357 ret {ty: t, mut: mut};
360 fn parse_ty_field(p: &parser) -> ast::ty_field {
361 let lo = p.get_lo_pos();
362 let mut = parse_mutability(p);
363 let id = parse_ident(p);
364 expect(p, token::COLON);
365 let ty = parse_ty(p, false);
366 ret spanned(lo, ty.span.hi, {ident: id, mt: {ty: ty, mut: mut}});
369 // if i is the jth ident in args, return j
371 fn ident_index(p: &parser, args: &[ast::arg], i: &ast::ident) -> uint {
373 for a: ast::arg in args { if a.ident == i { ret j; } j += 1u; }
374 p.fatal("Unbound variable " + i + " in constraint arg");
377 fn parse_type_constr_arg(p: &parser) -> @ast::ty_constr_arg {
378 let sp = p.get_span();
379 let carg = ast::carg_base;
380 expect(p, token::BINOP(token::STAR));
381 if p.peek() == token::DOT {
382 // "*..." notation for record fields
384 let pth: ast::path = parse_path(p);
385 carg = ast::carg_ident(pth);
387 // No literals yet, I guess?
388 ret @{node: carg, span: sp};
391 fn parse_constr_arg(args: &[ast::arg], p: &parser) -> @ast::constr_arg {
392 let sp = p.get_span();
393 let carg = ast::carg_base;
394 if p.peek() == token::BINOP(token::STAR) {
397 let i: ast::ident = parse_value_ident(p);
398 carg = ast::carg_ident(ident_index(p, args, i));
400 ret @{node: carg, span: sp};
403 fn parse_ty_constr(fn_args: &[ast::arg], p: &parser) -> @ast::constr {
404 let lo = p.get_lo_pos();
405 let path = parse_path(p);
406 let pf = bind parse_constr_arg(fn_args, _);
407 let args: {node: [@ast::constr_arg], span: span} =
408 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA), pf, p);
409 ret @spanned(lo, args.span.hi,
410 {path: path, args: args.node, id: p.get_id()});
413 fn parse_constr_in_type(p: &parser) -> @ast::ty_constr {
414 let lo = p.get_lo_pos();
415 let path = parse_path(p);
416 let args: [@ast::ty_constr_arg] =
417 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
418 parse_type_constr_arg, p).node;
419 let hi = p.get_lo_pos();
420 let tc: ast::ty_constr_ = {path: path, args: args, id: p.get_id()};
421 ret @spanned(lo, hi, tc);
425 fn parse_constrs<T>(pser: fn(&parser) -> @ast::constr_general<T>, p: &parser)
426 -> [@ast::constr_general<T>] {
427 let constrs: [@ast::constr_general<T>] = [];
429 let constr = pser(p);
431 if p.peek() == token::COMMA { p.bump(); } else { break; }
436 fn parse_type_constraints(p: &parser) -> [@ast::ty_constr] {
437 ret parse_constrs(parse_constr_in_type, p);
440 fn parse_ty_postfix(orig_t: ast::ty_, p: &parser, colons_before_params: bool)
442 let lo = p.get_lo_pos();
444 if colons_before_params && p.peek() == token::MOD_SEP {
446 expect(p, token::LT);
447 } else if !colons_before_params && p.peek() == token::LT {
449 } else { ret @spanned(lo, p.get_lo_pos(), orig_t); }
451 // If we're here, we have explicit type parameter instantiation.
452 let seq = parse_seq_to_gt(some(token::COMMA), bind parse_ty(_, false), p);
455 ast::ty_path(pth, ann) {
456 let hi = p.get_hi_pos();
458 ast::ty_path(spanned(lo, hi,
459 {global: pth.node.global,
460 idents: pth.node.idents,
463 _ { p.fatal("type parameter instantiation only allowed for paths"); }
467 fn parse_ty_or_bang(p: &parser) -> ty_or_bang {
469 token::NOT. { p.bump(); ret a_bang; }
470 _ { ret a_ty(parse_ty(p, false)); }
474 fn parse_ty(p: &parser, colons_before_params: bool) -> @ast::ty {
475 let lo = p.get_lo_pos();
478 // FIXME: do something with this
480 if eat_word(p, "bool") {
482 } else if eat_word(p, "int") {
484 } else if eat_word(p, "uint") {
486 } else if eat_word(p, "float") {
488 } else if eat_word(p, "str") {
490 } else if eat_word(p, "char") {
493 } else if (eat_word(p, "task")) {
496 } else if eat_word(p, "i8") {
497 t = ast::ty_machine(ast::ty_i8);
498 } else if eat_word(p, "i16") {
499 t = ast::ty_machine(ast::ty_i16);
500 } else if eat_word(p, "i32") {
501 t = ast::ty_machine(ast::ty_i32);
502 } else if eat_word(p, "i64") {
503 t = ast::ty_machine(ast::ty_i64);
504 } else if eat_word(p, "u8") {
505 t = ast::ty_machine(ast::ty_u8);
506 } else if eat_word(p, "u16") {
507 t = ast::ty_machine(ast::ty_u16);
508 } else if eat_word(p, "u32") {
509 t = ast::ty_machine(ast::ty_u32);
510 } else if eat_word(p, "u64") {
511 t = ast::ty_machine(ast::ty_u64);
512 } else if eat_word(p, "f32") {
513 t = ast::ty_machine(ast::ty_f32);
514 } else if eat_word(p, "f64") {
515 t = ast::ty_machine(ast::ty_f64);
516 } else if p.peek() == token::LPAREN {
518 if p.peek() == token::RPAREN {
523 let ts = [parse_ty(p, false)];
524 while p.peek() == token::COMMA {
526 ts += [parse_ty(p, false)];
528 if vec::len(ts) == 1u {
530 } else { t = ast::ty_tup(ts); }
532 expect(p, token::RPAREN);
534 } else if p.peek() == token::AT {
536 let mt = parse_mt(p);
539 } else if p.peek() == token::BINOP(token::STAR) {
541 let mt = parse_mt(p);
544 } else if p.peek() == token::LBRACE {
546 parse_seq(token::LBRACE, token::RBRACE, some(token::COMMA),
549 t = ast::ty_rec(elems.node);
550 if p.peek() == token::COLON {
553 ast::ty_constr(@spanned(lo, hi, t),
554 parse_type_constraints(p));
556 } else if p.peek() == token::LBRACKET {
557 expect(p, token::LBRACKET);
558 t = ast::ty_vec(parse_mt(p));
560 expect(p, token::RBRACKET);
561 } else if eat_word(p, "fn") {
562 t = parse_ty_fn(ast::proto_fn, p);
563 alt t { ast::ty_fn(_, _, out, _, _) { hi = out.span.hi; } }
564 } else if eat_word(p, "block") {
565 t = parse_ty_fn(ast::proto_block, p);
566 alt t { ast::ty_fn(_, _, out, _, _) { hi = out.span.hi; } }
567 } else if eat_word(p, "iter") {
568 t = parse_ty_fn(ast::proto_iter, p);
569 alt t { ast::ty_fn(_, _, out, _, _) { hi = out.span.hi; } }
570 } else if eat_word(p, "obj") {
571 t = parse_ty_obj(p, hi);
572 } else if eat_word(p, "mutable") {
573 p.warn("ignoring deprecated 'mutable' type constructor");
574 let typ = parse_ty(p, false);
577 } else if p.peek() == token::MOD_SEP || is_ident(p.peek()) {
578 let path = parse_path(p);
579 t = ast::ty_path(path, p.get_id());
581 } else { p.fatal("expecting type"); }
582 ret parse_ty_postfix(t, p, colons_before_params);
585 fn parse_arg_mode(p: &parser) -> ast::mode {
586 if eat(p, token::BINOP(token::AND)) {
587 ast::alias(eat_word(p, "mutable"))
588 } else if eat(p, token::BINOP(token::MINUS)) {
593 fn parse_arg(p: &parser) -> ast::arg {
594 let i = parse_value_ident(p);
595 expect(p, token::COLON);
596 let m = parse_arg_mode(p);
597 let t = parse_ty(p, false);
598 ret {mode: m, ty: t, ident: i, id: p.get_id()};
601 fn parse_fn_block_arg(p: &parser) -> ast::arg {
602 let m = parse_arg_mode(p);
603 let i = parse_value_ident(p);
604 let t = @spanned(p.get_lo_pos(), p.get_hi_pos(), ast::ty_infer);
605 ret {mode: m, ty: t, ident: i, id: p.get_id()};
608 fn parse_seq_to_before_gt<T>(sep: option::t<token::token>,
609 f: fn(&parser) -> T, p: &parser) -> [T] {
612 while p.peek() != token::GT && p.peek() != token::BINOP(token::LSR) &&
613 p.peek() != token::BINOP(token::ASR) {
615 some(t) { if first { first = false; } else { expect(p, t); } }
624 fn parse_seq_to_gt<T>(sep: option::t<token::token>, f: fn(&parser) -> T,
626 let v = parse_seq_to_before_gt(sep, f, p);
632 fn parse_seq_lt_gt<T>(sep: option::t<token::token>, f: fn(&parser) -> T,
633 p: &parser) -> spanned<[T]> {
634 let lo = p.get_lo_pos();
635 expect(p, token::LT);
636 let result = parse_seq_to_before_gt::<T>(sep, f, p);
637 let hi = p.get_hi_pos();
639 ret spanned(lo, hi, result);
642 fn parse_seq_to_end<T>(ket: token::token, sep: option::t<token::token>,
643 f: fn(&parser) -> T, p: &parser) -> [T] {
644 let val = parse_seq_to_before_end(ket, sep, f, p);
649 fn parse_seq_to_before_end<T>(ket: token::token, sep: option::t<token::token>,
650 f: fn(&parser) -> T, p: &parser) -> [T] {
651 let first: bool = true;
653 while p.peek() != ket {
655 some(t) { if first { first = false; } else { expect(p, t); } }
664 fn parse_seq<T>(bra: token::token, ket: token::token,
665 sep: option::t<token::token>, f: fn(&parser) -> T, p: &parser)
667 let lo = p.get_lo_pos();
669 let result = parse_seq_to_before_end::<T>(ket, sep, f, p);
670 let hi = p.get_hi_pos();
672 ret spanned(lo, hi, result);
676 fn parse_lit(p: &parser) -> ast::lit {
677 let sp = p.get_span();
678 let lit: ast::lit_ = ast::lit_nil;
679 if eat_word(p, "true") {
680 lit = ast::lit_bool(true);
681 } else if eat_word(p, "false") {
682 lit = ast::lit_bool(false);
685 token::LIT_INT(i) { p.bump(); lit = ast::lit_int(i); }
686 token::LIT_UINT(u) { p.bump(); lit = ast::lit_uint(u); }
687 token::LIT_FLOAT(s) {
689 lit = ast::lit_float(p.get_str(s));
691 token::LIT_MACH_INT(tm, i) {
693 lit = ast::lit_mach_int(tm, i);
695 token::LIT_MACH_FLOAT(tm, s) {
697 lit = ast::lit_mach_float(tm, p.get_str(s));
699 token::LIT_CHAR(c) { p.bump(); lit = ast::lit_char(c); }
700 token::LIT_STR(s) { p.bump(); lit = ast::lit_str(p.get_str(s)); }
703 expect(p, token::RPAREN);
706 t { unexpected(p, t); }
709 ret {node: lit, span: sp};
712 fn is_ident(t: token::token) -> bool {
713 alt t { token::IDENT(_, _) { ret true; } _ { } }
717 fn is_plain_ident(p: &parser) -> bool {
718 ret alt p.peek() { token::IDENT(_, false) { true } _ { false } };
721 fn parse_path(p: &parser) -> ast::path {
722 let lo = p.get_lo_pos();
726 if p.peek() == token::MOD_SEP {
729 } else { global = false; }
731 let ids: [ast::ident] = [];
736 ids += [p.get_str(i)];
739 if p.peek() == token::MOD_SEP && p.look_ahead(1u) != token::LT {
746 ret spanned(lo, hi, {global: global, idents: ids, types: []});
749 fn parse_path_and_ty_param_substs(p: &parser) -> ast::path {
750 let lo = p.get_lo_pos();
751 let path = parse_path(p);
752 if p.peek() == token::MOD_SEP {
756 parse_seq_lt_gt(some(token::COMMA), bind parse_ty(_, false), p);
757 let hi = seq.span.hi;
760 {global: path.node.global,
761 idents: path.node.idents,
767 fn parse_mutability(p: &parser) -> ast::mutability {
768 if eat_word(p, "mutable") {
769 if p.peek() == token::QUES { p.bump(); ret ast::maybe_mut; }
775 fn parse_field(p: &parser, sep: &token::token) -> ast::field {
776 let lo = p.get_lo_pos();
777 let m = parse_mutability(p);
778 let i = parse_ident(p);
780 let e = parse_expr(p);
781 ret spanned(lo, e.span.hi, {mut: m, ident: i, expr: e});
784 fn mk_expr(p: &parser, lo: uint, hi: uint, node: &ast::expr_) -> @ast::expr {
785 ret @{id: p.get_id(), node: node, span: ast_util::mk_sp(lo, hi)};
788 fn mk_mac_expr(p: &parser, lo: uint, hi: uint, m: &ast::mac_) -> @ast::expr {
789 ret @{id: p.get_id(),
790 node: ast::expr_mac({node: m, span: ast_util::mk_sp(lo, hi)}),
791 span: ast_util::mk_sp(lo, hi)};
794 fn parse_bottom_expr(p: &parser) -> @ast::expr {
795 let lo = p.get_lo_pos();
796 let hi = p.get_hi_pos();
799 if p.peek() == token::LPAREN {
801 if p.peek() == token::RPAREN {
804 let lit = @spanned(lo, hi, ast::lit_nil);
805 ret mk_expr(p, lo, hi, ast::expr_lit(lit));
807 let es = [parse_expr(p)];
808 while p.peek() == token::COMMA { p.bump(); es += [parse_expr(p)]; }
810 expect(p, token::RPAREN);
811 if vec::len(es) == 1u {
812 ret mk_expr(p, lo, hi, es[0].node);
813 } else { ret mk_expr(p, lo, hi, ast::expr_tup(es)); }
814 } else if p.peek() == token::LBRACE {
816 if is_word(p, "mutable") ||
817 is_plain_ident(p) && p.look_ahead(1u) == token::COLON {
818 let fields = [parse_field(p, token::COLON)];
820 while p.peek() != token::RBRACE {
821 if eat_word(p, "with") { base = some(parse_expr(p)); break; }
822 expect(p, token::COMMA);
823 fields += [parse_field(p, token::COLON)];
826 expect(p, token::RBRACE);
827 ex = ast::expr_rec(fields, base);
828 } else if p.peek() == token::BINOP(token::OR) {
829 ret parse_fn_block_expr(p);
831 let blk = parse_block_tail(p, lo, ast::checked);
832 ret mk_expr(p, blk.span.lo, blk.span.hi, ast::expr_block(blk));
834 } else if eat_word(p, "if") {
835 ret parse_if_expr(p);
836 } else if eat_word(p, "for") {
837 ret parse_for_expr(p);
838 } else if eat_word(p, "while") {
839 ret parse_while_expr(p);
840 } else if eat_word(p, "do") {
841 ret parse_do_while_expr(p);
842 } else if eat_word(p, "alt") {
843 ret parse_alt_expr(p);
845 } else if (eat_word(p, "spawn")) {
846 ret parse_spawn_expr(p);
848 } else if eat_word(p, "fn") {
849 ret parse_fn_expr(p, ast::proto_fn);
850 } else if eat_word(p, "block") {
851 ret parse_fn_expr(p, ast::proto_block);
852 } else if eat_word(p, "lambda") {
853 ret parse_fn_expr(p, ast::proto_closure);
854 } else if eat_word(p, "unchecked") {
855 expect(p, token::LBRACE);
856 let blk = parse_block_tail(p, lo, ast::unchecked);
857 ret mk_expr(p, blk.span.lo, blk.span.hi, ast::expr_block(blk));
858 } else if p.peek() == token::LBRACKET {
860 let mut = parse_mutability(p);
862 parse_seq_to_end(token::RBRACKET, some(token::COMMA), parse_expr,
864 ex = ast::expr_vec(es, mut);
865 } else if p.peek() == token::POUND_LT {
867 let ty = parse_ty(p, false);
868 expect(p, token::GT);
870 /* hack: early return to take advantage of specialized function */
871 ret mk_mac_expr(p, lo, p.get_hi_pos(), ast::mac_embed_type(ty))
872 } else if p.peek() == token::POUND_LBRACE {
874 let blk = ast::mac_embed_block(parse_block_tail(p, lo, ast::checked));
875 ret mk_mac_expr(p, lo, p.get_hi_pos(), blk);
876 } else if p.peek() == token::ELLIPSIS {
878 ret mk_mac_expr(p, lo, p.get_hi_pos(), ast::mac_ellipsis)
879 } else if p.peek() == token::TILDE {
881 ex = ast::expr_uniq(parse_expr(p));
882 } else if eat_word(p, "obj") {
885 // Only make people type () if they're actually adding new fields
886 let fields: option::t<[ast::anon_obj_field]> = none;
887 if p.peek() == token::LPAREN {
890 some(parse_seq_to_end(token::RPAREN, some(token::COMMA),
891 parse_anon_obj_field, p));
893 let meths: [@ast::method] = [];
894 let inner_obj: option::t<@ast::expr> = none;
895 expect(p, token::LBRACE);
896 while p.peek() != token::RBRACE {
897 if eat_word(p, "with") {
898 inner_obj = some(parse_expr(p));
899 } else { meths += [parse_method(p)]; }
902 expect(p, token::RBRACE);
903 // fields and methods may be *additional* or *overriding* fields
904 // and methods if there's a inner_obj, or they may be the *only*
905 // fields and methods if there's no inner_obj.
907 // We don't need to pull ".node" out of fields because it's not a
909 let ob = {fields: fields, methods: meths, inner_obj: inner_obj};
910 ex = ast::expr_anon_obj(ob);
911 } else if eat_word(p, "bind") {
912 let e = parse_expr_res(p, RESTRICT_NO_CALL_EXPRS);
913 fn parse_expr_opt(p: &parser) -> option::t<@ast::expr> {
915 token::UNDERSCORE. { p.bump(); ret none; }
916 _ { ret some(parse_expr(p)); }
920 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
923 ex = ast::expr_bind(e, es.node);
924 } else if p.peek() == token::POUND {
925 let ex_ext = parse_syntax_ext(p);
928 } else if eat_word(p, "fail") {
929 if can_begin_expr(p.peek()) {
930 let e = parse_expr(p);
932 ex = ast::expr_fail(some(e));
933 } else { ex = ast::expr_fail(none); }
934 } else if eat_word(p, "log") {
935 let e = parse_expr(p);
936 ex = ast::expr_log(1, e);
938 } else if eat_word(p, "log_err") {
939 let e = parse_expr(p);
940 ex = ast::expr_log(0, e);
942 } else if eat_word(p, "assert") {
943 let e = parse_expr(p);
944 ex = ast::expr_assert(e);
946 } else if eat_word(p, "check") {
947 /* Should be a predicate (pure boolean function) applied to
948 arguments that are all either slot variables or literals.
949 but the typechecker enforces that. */
951 let e = parse_expr(p);
953 ex = ast::expr_check(ast::checked, e);
954 } else if eat_word(p, "claim") {
955 /* Same rules as check, except that if check-claims
956 is enabled (a command-line flag), then the parser turns
959 let e = parse_expr(p);
961 ex = ast::expr_check(ast::unchecked, e);
962 } else if eat_word(p, "ret") {
963 if can_begin_expr(p.peek()) {
964 let e = parse_expr(p);
966 ex = ast::expr_ret(some(e));
967 } else { ex = ast::expr_ret(none); }
968 } else if eat_word(p, "break") {
969 ex = ast::expr_break;
971 } else if eat_word(p, "cont") {
974 } else if eat_word(p, "put") {
976 token::SEMI. { ex = ast::expr_put(none); }
978 let e = parse_expr(p);
980 ex = ast::expr_put(some(e));
983 } else if eat_word(p, "be") {
984 let e = parse_expr(p);
986 // FIXME: Is this the right place for this check?
987 if /*check*/ast_util::is_call_expr(e) {
989 ex = ast::expr_be(e);
990 } else { p.fatal("Non-call expression in tail call"); }
991 } else if eat_word(p, "copy") {
992 let e = parse_expr(p);
993 ex = ast::expr_copy(e);
995 } else if eat_word(p, "self") {
996 expect(p, token::DOT);
997 // The rest is a call expression.
998 let f: @ast::expr = parse_self_method(p);
1000 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
1003 ex = ast::expr_call(f, es.node);
1004 } else if p.peek() == token::MOD_SEP ||
1005 is_ident(p.peek()) && !is_word(p, "true") &&
1006 !is_word(p, "false") {
1008 let pth = parse_path_and_ty_param_substs(p);
1010 ex = ast::expr_path(pth);
1012 let lit = parse_lit(p);
1014 ex = ast::expr_lit(@lit);
1016 ret mk_expr(p, lo, hi, ex);
1019 fn parse_syntax_ext(p: &parser) -> @ast::expr {
1020 let lo = p.get_lo_pos();
1021 expect(p, token::POUND);
1022 ret parse_syntax_ext_naked(p, lo);
1025 fn parse_syntax_ext_naked(p: &parser, lo: uint) -> @ast::expr {
1026 let pth = parse_path(p);
1027 if vec::len(pth.node.idents) == 0u {
1028 p.fatal("expected a syntax expander name");
1030 //temporary for a backwards-compatible cycle:
1032 if p.peek() == token::LPAREN {
1033 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
1036 parse_seq(token::LBRACKET, token::RBRACKET, some(token::COMMA),
1039 let hi = es.span.hi;
1040 let e = mk_expr(p, es.span.lo, hi, ast::expr_vec(es.node, ast::imm));
1041 ret mk_mac_expr(p, lo, hi, ast::mac_invoc(pth, e, none));
1044 fn parse_self_method(p: &parser) -> @ast::expr {
1045 let sp = p.get_span();
1046 let f_name: ast::ident = parse_ident(p);
1047 ret mk_expr(p, sp.lo, sp.hi, ast::expr_self_method(f_name));
1050 fn parse_dot_or_call_expr(p: &parser) -> @ast::expr {
1051 ret parse_dot_or_call_expr_with(p, parse_bottom_expr(p));
1054 fn parse_dot_or_call_expr_with(p: &parser, e: @ast::expr) -> @ast::expr {
1060 if p.get_restriction() == RESTRICT_NO_CALL_EXPRS {
1066 parse_seq(token::LPAREN, token::RPAREN,
1067 some(token::COMMA), parse_expr, p);
1069 let nd = ast::expr_call(e, es.node);
1070 e = mk_expr(p, lo, hi, nd);
1075 let ix = parse_expr(p);
1077 expect(p, token::RBRACKET);
1078 e = mk_expr(p, lo, hi, ast::expr_index(e, ix));
1083 token::IDENT(i, _) {
1084 hi = p.get_hi_pos();
1086 e = mk_expr(p, lo, hi, ast::expr_field(e, p.get_str(i)));
1088 t { unexpected(p, t); }
1097 fn parse_prefix_expr(p: &parser) -> @ast::expr {
1098 if eat_word(p, "mutable") {
1099 p.warn("ignoring deprecated 'mutable' prefix operator");
1101 let lo = p.get_lo_pos();
1102 let hi = p.get_hi_pos();
1108 let e = parse_prefix_expr(p);
1110 ex = ast::expr_unary(ast::not, e);
1116 let e = parse_prefix_expr(p);
1118 ex = ast::expr_unary(ast::neg, e);
1122 let e = parse_prefix_expr(p);
1124 ex = ast::expr_unary(ast::deref, e);
1126 _ { ret parse_dot_or_call_expr(p); }
1131 let m = parse_mutability(p);
1132 let e = parse_prefix_expr(p);
1134 ex = ast::expr_unary(ast::box(m), e);
1136 _ { ret parse_dot_or_call_expr(p); }
1138 ret mk_expr(p, lo, hi, ex);
1141 fn parse_ternary(p: &parser) -> @ast::expr {
1142 let cond_expr = parse_binops(p);
1143 if p.peek() == token::QUES {
1145 let then_expr = parse_expr(p);
1146 expect(p, token::COLON);
1147 let else_expr = parse_expr(p);
1148 ret mk_expr(p, cond_expr.span.lo, else_expr.span.hi,
1149 ast::expr_ternary(cond_expr, then_expr, else_expr));
1150 } else { ret cond_expr; }
1153 type op_spec = {tok: token::token, op: ast::binop, prec: int};
1156 // FIXME make this a const, don't store it in parser state
1157 fn prec_table() -> @[op_spec] {
1158 ret @[{tok: token::BINOP(token::STAR), op: ast::mul, prec: 11},
1159 {tok: token::BINOP(token::SLASH), op: ast::div, prec: 11},
1160 {tok: token::BINOP(token::PERCENT), op: ast::rem, prec: 11},
1161 {tok: token::BINOP(token::PLUS), op: ast::add, prec: 10},
1162 {tok: token::BINOP(token::MINUS), op: ast::sub, prec: 10},
1163 {tok: token::BINOP(token::LSL), op: ast::lsl, prec: 9},
1164 {tok: token::BINOP(token::LSR), op: ast::lsr, prec: 9},
1165 {tok: token::BINOP(token::ASR), op: ast::asr, prec: 9},
1166 {tok: token::BINOP(token::AND), op: ast::bitand, prec: 8},
1167 {tok: token::BINOP(token::CARET), op: ast::bitxor, prec: 6},
1168 {tok: token::BINOP(token::OR), op: ast::bitor, prec: 6},
1169 // 'as' sits between here with 5
1170 {tok: token::LT, op: ast::lt, prec: 4},
1171 {tok: token::LE, op: ast::le, prec: 4},
1172 {tok: token::GE, op: ast::ge, prec: 4},
1173 {tok: token::GT, op: ast::gt, prec: 4},
1174 {tok: token::EQEQ, op: ast::eq, prec: 3},
1175 {tok: token::NE, op: ast::ne, prec: 3},
1176 {tok: token::ANDAND, op: ast::and, prec: 2},
1177 {tok: token::OROR, op: ast::or, prec: 1}];
1180 fn parse_binops(p: &parser) -> @ast::expr {
1181 ret parse_more_binops(p, parse_prefix_expr(p), 0);
1184 const unop_prec: int = 100;
1186 const as_prec: int = 5;
1187 const ternary_prec: int = 0;
1189 fn parse_more_binops(p: &parser, lhs: @ast::expr, min_prec: int) ->
1191 let peeked = p.peek();
1192 for cur: op_spec in *p.get_prec_table() {
1193 if cur.prec > min_prec && cur.tok == peeked {
1195 let rhs = parse_more_binops(p, parse_prefix_expr(p), cur.prec);
1197 mk_expr(p, lhs.span.lo, rhs.span.hi,
1198 ast::expr_binary(cur.op, lhs, rhs));
1199 ret parse_more_binops(p, bin, min_prec);
1202 if as_prec > min_prec && eat_word(p, "as") {
1203 let rhs = parse_ty(p, true);
1205 mk_expr(p, lhs.span.lo, rhs.span.hi, ast::expr_cast(lhs, rhs));
1206 ret parse_more_binops(p, _as, min_prec);
1211 fn parse_assign_expr(p: &parser) -> @ast::expr {
1212 let lo = p.get_lo_pos();
1213 let lhs = parse_ternary(p);
1217 let rhs = parse_expr(p);
1218 ret mk_expr(p, lo, rhs.span.hi, ast::expr_assign(lhs, rhs));
1220 token::BINOPEQ(op) {
1222 let rhs = parse_expr(p);
1225 token::PLUS. { aop = ast::add; }
1226 token::MINUS. { aop = ast::sub; }
1227 token::STAR. { aop = ast::mul; }
1228 token::SLASH. { aop = ast::div; }
1229 token::PERCENT. { aop = ast::rem; }
1230 token::CARET. { aop = ast::bitxor; }
1231 token::AND. { aop = ast::bitand; }
1232 token::OR. { aop = ast::bitor; }
1233 token::LSL. { aop = ast::lsl; }
1234 token::LSR. { aop = ast::lsr; }
1235 token::ASR. { aop = ast::asr; }
1237 ret mk_expr(p, lo, rhs.span.hi, ast::expr_assign_op(aop, lhs, rhs));
1241 let rhs = parse_expr(p);
1242 ret mk_expr(p, lo, rhs.span.hi, ast::expr_move(lhs, rhs));
1246 let rhs = parse_expr(p);
1247 ret mk_expr(p, lo, rhs.span.hi, ast::expr_swap(lhs, rhs));
1249 _ {/* fall through */ }
1254 fn parse_if_expr_1(p: &parser) ->
1257 els: option::t<@ast::expr>,
1260 let lo = p.get_last_lo_pos();
1261 let cond = parse_expr(p);
1262 let thn = parse_block(p);
1263 let els: option::t<@ast::expr> = none;
1264 let hi = thn.span.hi;
1265 if eat_word(p, "else") {
1266 let elexpr = parse_else_expr(p);
1268 hi = elexpr.span.hi;
1270 ret {cond: cond, then: thn, els: els, lo: lo, hi: hi};
1273 fn parse_if_expr(p: &parser) -> @ast::expr {
1274 if eat_word(p, "check") {
1275 let q = parse_if_expr_1(p);
1276 ret mk_expr(p, q.lo, q.hi, ast::expr_if_check(q.cond, q.then, q.els));
1278 let q = parse_if_expr_1(p);
1279 ret mk_expr(p, q.lo, q.hi, ast::expr_if(q.cond, q.then, q.els));
1283 fn parse_fn_expr(p: &parser, proto: ast::proto) -> @ast::expr {
1284 let lo = p.get_last_lo_pos();
1285 let decl = parse_fn_decl(p, ast::impure_fn, ast::il_normal);
1286 let body = parse_block(p);
1287 let _fn = {decl: decl, proto: proto, body: body};
1288 ret mk_expr(p, lo, body.span.hi, ast::expr_fn(_fn));
1291 fn parse_fn_block_expr(p: &parser) -> @ast::expr {
1292 let lo = p.get_last_lo_pos();
1293 let decl = parse_fn_block_decl(p);
1294 let body = parse_block_tail(p, lo, ast::checked);
1295 let _fn = {decl: decl, proto: ast::proto_block, body: body};
1296 ret mk_expr(p, lo, body.span.hi, ast::expr_fn(_fn));
1299 fn parse_else_expr(p: &parser) -> @ast::expr {
1300 if eat_word(p, "if") {
1301 ret parse_if_expr(p);
1303 let blk = parse_block(p);
1304 ret mk_expr(p, blk.span.lo, blk.span.hi, ast::expr_block(blk));
1308 fn parse_for_expr(p: &parser) -> @ast::expr {
1309 let lo = p.get_last_lo_pos();
1310 let is_each = eat_word(p, "each");
1311 let decl = parse_local(p, false);
1312 expect_word(p, "in");
1313 let seq = parse_expr(p);
1314 let body = parse_block(p);
1315 let hi = body.span.hi;
1317 ret mk_expr(p, lo, hi, ast::expr_for_each(decl, seq, body));
1318 } else { ret mk_expr(p, lo, hi, ast::expr_for(decl, seq, body)); }
1321 fn parse_while_expr(p: &parser) -> @ast::expr {
1322 let lo = p.get_last_lo_pos();
1323 let cond = parse_expr(p);
1324 let body = parse_block(p);
1325 let hi = body.span.hi;
1326 ret mk_expr(p, lo, hi, ast::expr_while(cond, body));
1329 fn parse_do_while_expr(p: &parser) -> @ast::expr {
1330 let lo = p.get_last_lo_pos();
1331 let body = parse_block(p);
1332 expect_word(p, "while");
1333 let cond = parse_expr(p);
1334 let hi = cond.span.hi;
1335 ret mk_expr(p, lo, hi, ast::expr_do_while(body, cond));
1338 fn parse_alt_expr(p: &parser) -> @ast::expr {
1339 let lo = p.get_last_lo_pos();
1340 let discriminant = parse_expr(p);
1341 expect(p, token::LBRACE);
1342 let arms: [ast::arm] = [];
1343 while p.peek() != token::RBRACE {
1344 let pats = parse_pats(p);
1346 if eat_word(p, "when") { guard = some(parse_expr(p)); }
1347 let blk = parse_block(p);
1348 arms += [{pats: pats, guard: guard, body: blk}];
1350 let hi = p.get_hi_pos();
1352 ret mk_expr(p, lo, hi, ast::expr_alt(discriminant, arms));
1355 fn parse_expr(p: &parser) -> @ast::expr {
1356 ret parse_expr_res(p, UNRESTRICTED);
1359 fn parse_expr_res(p: &parser, r: restriction) -> @ast::expr {
1360 let old = p.get_restriction();
1362 let e = parse_assign_expr(p);
1367 fn parse_initializer(p: &parser) -> option::t<ast::initializer> {
1371 ret some({op: ast::init_assign, expr: parse_expr(p)});
1375 ret some({op: ast::init_move, expr: parse_expr(p)});
1380 // Now that the the channel is the first argument to receive,
1381 // combining it with an initializer doesn't really make sense.
1382 // case (token::RECV) {
1384 // ret some(rec(op = ast::init_recv,
1385 // expr = parse_expr(p)));
1393 fn parse_pats(p: &parser) -> [@ast::pat] {
1396 pats += [parse_pat(p)];
1397 if p.peek() == token::BINOP(token::OR) { p.bump(); } else { break; }
1402 fn parse_pat(p: &parser) -> @ast::pat {
1403 let lo = p.get_lo_pos();
1404 let hi = p.get_hi_pos();
1407 token::UNDERSCORE. { p.bump(); pat = ast::pat_wild; }
1410 let sub = parse_pat(p);
1411 pat = ast::pat_box(sub);
1419 while p.peek() != token::RBRACE {
1420 if first { first = false; } else { expect(p, token::COMMA); }
1422 if p.peek() == token::UNDERSCORE {
1424 if p.peek() != token::RBRACE {
1425 p.fatal("expecting }, found " +
1426 token::to_str(p.get_reader(), p.peek()));
1432 let fieldname = parse_ident(p);
1434 if p.peek() == token::COLON {
1436 subpat = parse_pat(p);
1438 if p.get_bad_expr_words().contains_key(fieldname) {
1439 p.fatal("found " + fieldname + " in binding position");
1443 node: ast::pat_bind(fieldname),
1444 span: ast_util::mk_sp(lo, hi)};
1446 fields += [{ident: fieldname, pat: subpat}];
1448 hi = p.get_hi_pos();
1450 pat = ast::pat_rec(fields, etc);
1454 if p.peek() == token::RPAREN {
1455 hi = p.get_hi_pos();
1458 ast::pat_lit(@{node: ast::lit_nil,
1459 span: ast_util::mk_sp(lo, hi)});
1461 let fields = [parse_pat(p)];
1462 while p.peek() == token::COMMA {
1464 fields += [parse_pat(p)];
1466 if vec::len(fields) == 1u { expect(p, token::COMMA); }
1467 hi = p.get_hi_pos();
1468 expect(p, token::RPAREN);
1469 pat = ast::pat_tup(fields);
1473 if !is_ident(tok) || is_word(p, "true") || is_word(p, "false") {
1474 let lit = parse_lit(p);
1476 pat = ast::pat_lit(@lit);
1477 } else if is_plain_ident(p) &&
1478 alt p.look_ahead(1u) {
1479 token::DOT. | token::LPAREN. | token::LBRACKET. {
1484 hi = p.get_hi_pos();
1485 pat = ast::pat_bind(parse_value_ident(p));
1487 let tag_path = parse_path_and_ty_param_substs(p);
1488 hi = tag_path.span.hi;
1489 let args: [@ast::pat];
1493 parse_seq(token::LPAREN, token::RPAREN,
1494 some(token::COMMA), parse_pat, p);
1498 token::DOT. { args = []; p.bump(); }
1499 _ { expect(p, token::LPAREN); fail; }
1501 pat = ast::pat_tag(tag_path, args);
1505 ret @{id: p.get_id(), node: pat, span: ast_util::mk_sp(lo, hi)};
1508 fn parse_local(p: &parser, allow_init: bool) -> @ast::local {
1509 let lo = p.get_lo_pos();
1510 let pat = parse_pat(p);
1511 let ty = @spanned(lo, lo, ast::ty_infer);
1512 if eat(p, token::COLON) { ty = parse_ty(p, false); }
1513 let init = if allow_init { parse_initializer(p) } else { none };
1514 ret @spanned(lo, p.get_last_hi_pos(),
1515 {ty: ty, pat: pat, init: init, id: p.get_id()});
1518 fn parse_let(p: &parser) -> @ast::decl {
1519 let lo = p.get_lo_pos();
1520 let locals = [parse_local(p, true)];
1521 while p.peek() == token::COMMA {
1523 locals += [parse_local(p, true)];
1525 ret @spanned(lo, p.get_last_hi_pos(), ast::decl_local(locals));
1528 fn parse_stmt(p: &parser) -> @ast::stmt {
1529 if p.get_file_type() == SOURCE_FILE {
1530 ret parse_source_stmt(p);
1531 } else { ret parse_crate_stmt(p); }
1534 fn parse_crate_stmt(p: &parser) -> @ast::stmt {
1535 let cdir = parse_crate_directive(p, []);
1536 ret @spanned(cdir.span.lo, cdir.span.hi,
1537 ast::stmt_crate_directive(@cdir));
1540 fn parse_source_stmt(p: &parser) -> @ast::stmt {
1541 let lo = p.get_lo_pos();
1542 if eat_word(p, "let") {
1543 let decl = parse_let(p);
1544 ret @spanned(lo, decl.span.hi, ast::stmt_decl(decl, p.get_id()));
1548 alt parse_outer_attrs_or_ext(p) {
1549 none. { item_attrs = []; }
1550 some(left(attrs)) { item_attrs = attrs; }
1552 ret @spanned(lo, ext.span.hi, ast::stmt_expr(ext, p.get_id()));
1556 let maybe_item = parse_item(p, item_attrs);
1558 // If we have attributes then we should have an item
1559 if vec::len(item_attrs) > 0u {
1561 some(_) {/* fallthrough */ }
1562 _ { ret p.fatal("expected item"); }
1570 let decl = @spanned(lo, hi, ast::decl_item(i));
1571 ret @spanned(lo, hi, ast::stmt_decl(decl, p.get_id()));
1574 // Remainder are line-expr stmts.
1575 let e = parse_expr(p);
1576 ret @spanned(lo, e.span.hi, ast::stmt_expr(e, p.get_id()));
1578 _ { p.fatal("expected statement"); }
1583 fn stmt_to_expr(stmt: @ast::stmt) -> option::t<@ast::expr> {
1584 ret alt stmt.node { ast::stmt_expr(e, _) { some(e) } _ { none } };
1587 fn stmt_ends_with_semi(stmt: &ast::stmt) -> bool {
1589 ast::stmt_decl(d, _) {
1591 ast::decl_local(_) { true }
1592 ast::decl_item(_) { false }
1595 ast::stmt_expr(e, _) {
1597 ast::expr_vec(_, _) { true }
1598 ast::expr_rec(_, _) { true }
1599 ast::expr_tup(_) { true }
1600 ast::expr_call(_, _) { true }
1601 ast::expr_self_method(_) { false }
1602 ast::expr_bind(_, _) { true }
1603 ast::expr_binary(_, _, _) { true }
1604 ast::expr_unary(_, _) { true }
1605 ast::expr_lit(_) { true }
1606 ast::expr_cast(_, _) { true }
1607 ast::expr_if(_, _, _) { false }
1608 ast::expr_ternary(_, _, _) { true }
1609 ast::expr_for(_, _, _) { false }
1610 ast::expr_for_each(_, _, _) { false }
1611 ast::expr_while(_, _) { false }
1612 ast::expr_do_while(_, _) { false }
1613 ast::expr_alt(_, _) { false }
1614 ast::expr_fn(_) { false }
1615 ast::expr_block(_) { false }
1616 ast::expr_copy(_) { true }
1617 ast::expr_move(_, _) { true }
1618 ast::expr_assign(_, _) { true }
1619 ast::expr_swap(_, _) { true }
1620 ast::expr_assign_op(_, _, _) { true }
1621 ast::expr_field(_, _) { true }
1622 ast::expr_index(_, _) { true }
1623 ast::expr_path(_) { true }
1624 ast::expr_mac(_) { true }
1625 ast::expr_fail(_) { true }
1626 ast::expr_break. { true }
1627 ast::expr_cont. { true }
1628 ast::expr_ret(_) { true }
1629 ast::expr_put(_) { true }
1630 ast::expr_be(_) { true }
1631 ast::expr_log(_, _) { true }
1632 ast::expr_check(_, _) { true }
1633 ast::expr_if_check(_, _, _) { false }
1634 ast::expr_anon_obj(_) { false }
1635 ast::expr_assert(_) { true }
1641 // We should not be calling this on a cdir.
1642 ast::stmt_crate_directive(cdir) {
1648 fn parse_block(p: &parser) -> ast::blk {
1649 let lo = p.get_lo_pos();
1650 if eat_word(p, "unchecked") {
1651 be parse_block_tail(p, lo, ast::unchecked);
1653 expect(p, token::LBRACE);
1654 be parse_block_tail(p, lo, ast::checked);
1658 // Precondition: already parsed the '{' or '#{'
1659 // I guess that also means "already parsed the 'impure'" if
1660 // necessary, and this should take a qualifier.
1661 // some blocks start with "#{"...
1662 fn parse_block_tail(p: &parser, lo: uint, s: ast::check_mode) -> ast::blk {
1663 let stmts: [@ast::stmt] = [];
1664 let expr: option::t<@ast::expr> = none;
1665 while p.peek() != token::RBRACE {
1671 let stmt = parse_stmt(p);
1672 alt stmt_to_expr(stmt) {
1675 token::SEMI. { p.bump(); stmts += [stmt]; }
1676 token::RBRACE. { expr = some(e); }
1678 if stmt_ends_with_semi(*stmt) {
1679 p.fatal("expected ';' or '}' after " +
1680 "expression but found " +
1681 token::to_str(p.get_reader(), t));
1688 // Not an expression statement.
1692 if p.get_file_type() == SOURCE_FILE &&
1693 stmt_ends_with_semi(*stmt) {
1694 expect(p, token::SEMI);
1701 let hi = p.get_hi_pos();
1703 let bloc = {stmts: stmts, expr: expr, id: p.get_id(), rules: s};
1704 ret spanned(lo, hi, bloc);
1707 fn parse_ty_param(p: &parser) -> ast::ty_param {
1710 token::TILDE. { p.bump(); ast::kind_unique }
1711 token::AT. { p.bump(); ast::kind_shared }
1712 _ { ast::kind_pinned }
1714 ret {ident: parse_ident(p), kind: k};
1717 fn parse_ty_params(p: &parser) -> [ast::ty_param] {
1718 let ty_params: [ast::ty_param] = [];
1719 if p.peek() == token::LT {
1721 ty_params = parse_seq_to_gt(some(token::COMMA), parse_ty_param, p);
1723 if p.peek() == token::LT {
1725 parse_seq(token::LT, token::GT, some(token::COMMA),
1726 parse_ty_param, p).node;
1731 fn parse_fn_decl(p: &parser, purity: ast::purity, il: ast::inlineness) ->
1733 let inputs: ast::spanned<[ast::arg]> =
1734 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA), parse_arg,
1736 let rslt: ty_or_bang;
1737 // Use the args list to translate each bound variable
1738 // mentioned in a constraint to an arg index.
1739 // Seems weird to do this in the parser, but I'm not sure how else to.
1741 if p.peek() == token::COLON {
1743 constrs = parse_constrs(bind parse_ty_constr(inputs.node, _), p);
1745 if p.peek() == token::RARROW {
1747 rslt = parse_ty_or_bang(p);
1749 rslt = a_ty(@spanned(inputs.span.lo, inputs.span.hi, ast::ty_nil));
1753 ret {inputs: inputs.node,
1758 constraints: constrs};
1761 ret {inputs: inputs.node,
1762 output: @spanned(p.get_lo_pos(), p.get_hi_pos(), ast::ty_bot),
1766 constraints: constrs};
1771 fn parse_fn_block_decl(p: &parser) -> ast::fn_decl {
1772 let inputs: ast::spanned<[ast::arg]> =
1773 parse_seq(token::BINOP(token::OR), token::BINOP(token::OR),
1774 some(token::COMMA), parse_fn_block_arg, p);
1775 ret {inputs: inputs.node,
1776 output: @spanned(p.get_lo_pos(), p.get_hi_pos(), ast::ty_infer),
1777 purity: ast::impure_fn,
1783 fn parse_fn(p: &parser, proto: ast::proto, purity: ast::purity,
1784 il: ast::inlineness) -> ast::_fn {
1785 let decl = parse_fn_decl(p, purity, il);
1786 let body = parse_block(p);
1787 ret {decl: decl, proto: proto, body: body};
1790 fn parse_fn_header(p: &parser) -> {ident: ast::ident, tps: [ast::ty_param]} {
1791 let id = parse_value_ident(p);
1792 let ty_params = parse_ty_params(p);
1793 ret {ident: id, tps: ty_params};
1796 fn mk_item(p: &parser, lo: uint, hi: uint, ident: &ast::ident,
1797 node: &ast::item_, attrs: &[ast::attribute]) -> @ast::item {
1802 span: ast_util::mk_sp(lo, hi)};
1805 fn parse_item_fn_or_iter(p: &parser, purity: ast::purity, proto: ast::proto,
1806 attrs: &[ast::attribute], il: ast::inlineness) ->
1808 let lo = p.get_last_lo_pos();
1809 let t = parse_fn_header(p);
1810 let f = parse_fn(p, proto, purity, il);
1811 ret mk_item(p, lo, f.body.span.hi, t.ident, ast::item_fn(f, t.tps),
1815 fn parse_obj_field(p: &parser) -> ast::obj_field {
1816 let mut = parse_mutability(p);
1817 let ident = parse_value_ident(p);
1818 expect(p, token::COLON);
1819 let ty = parse_ty(p, false);
1820 ret {mut: mut, ty: ty, ident: ident, id: p.get_id()};
1823 fn parse_anon_obj_field(p: &parser) -> ast::anon_obj_field {
1824 let mut = parse_mutability(p);
1825 let ident = parse_value_ident(p);
1826 expect(p, token::COLON);
1827 let ty = parse_ty(p, false);
1828 expect(p, token::EQ);
1829 let expr = parse_expr(p);
1830 ret {mut: mut, ty: ty, expr: expr, ident: ident, id: p.get_id()};
1833 fn parse_method(p: &parser) -> @ast::method {
1834 let lo = p.get_lo_pos();
1835 let proto = parse_proto(p);
1836 let ident = parse_value_ident(p);
1837 let f = parse_fn(p, proto, ast::impure_fn, ast::il_normal);
1838 let meth = {ident: ident, meth: f, id: p.get_id()};
1839 ret @spanned(lo, f.body.span.hi, meth);
1842 fn parse_item_obj(p: &parser, attrs: &[ast::attribute]) -> @ast::item {
1843 let lo = p.get_last_lo_pos();
1844 let ident = parse_value_ident(p);
1845 let ty_params = parse_ty_params(p);
1846 let fields: ast::spanned<[ast::obj_field]> =
1847 parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
1848 parse_obj_field, p);
1849 let meths: [@ast::method] = [];
1850 expect(p, token::LBRACE);
1851 while p.peek() != token::RBRACE { meths += [parse_method(p)]; }
1852 let hi = p.get_hi_pos();
1853 expect(p, token::RBRACE);
1854 let ob: ast::_obj = {fields: fields.node, methods: meths};
1855 ret mk_item(p, lo, hi, ident, ast::item_obj(ob, ty_params, p.get_id()),
1859 fn parse_item_res(p: &parser, attrs: &[ast::attribute]) -> @ast::item {
1860 let lo = p.get_last_lo_pos();
1861 let ident = parse_value_ident(p);
1862 let ty_params = parse_ty_params(p);
1863 expect(p, token::LPAREN);
1864 let arg_ident = parse_value_ident(p);
1865 expect(p, token::COLON);
1866 let t = parse_ty(p, false);
1867 expect(p, token::RPAREN);
1868 let dtor = parse_block(p);
1871 [{mode: ast::alias(false),
1875 output: @spanned(lo, lo, ast::ty_nil),
1876 purity: ast::impure_fn,
1880 let f = {decl: decl, proto: ast::proto_fn, body: dtor};
1881 ret mk_item(p, lo, dtor.span.hi, ident,
1882 ast::item_res(f, p.get_id(), ty_params, p.get_id()), attrs);
1885 fn parse_mod_items(p: &parser, term: token::token,
1886 first_item_attrs: &[ast::attribute]) -> ast::_mod {
1887 // Shouldn't be any view items since we've already parsed an item attr
1889 if vec::len(first_item_attrs) == 0u { parse_view(p) } else { [] };
1890 let items: [@ast::item] = [];
1891 let initial_attrs = first_item_attrs;
1892 while p.peek() != term {
1893 let attrs = initial_attrs + parse_outer_attributes(p);
1895 alt parse_item(p, attrs) {
1896 some(i) { items += [i]; }
1898 p.fatal("expected item but found " +
1899 token::to_str(p.get_reader(), p.peek()));
1903 ret {view_items: view_items, items: items};
1906 fn parse_item_const(p: &parser, attrs: &[ast::attribute]) -> @ast::item {
1907 let lo = p.get_last_lo_pos();
1908 let id = parse_value_ident(p);
1909 expect(p, token::COLON);
1910 let ty = parse_ty(p, false);
1911 expect(p, token::EQ);
1912 let e = parse_expr(p);
1913 let hi = p.get_hi_pos();
1914 expect(p, token::SEMI);
1915 ret mk_item(p, lo, hi, id, ast::item_const(ty, e), attrs);
1918 fn parse_item_mod(p: &parser, attrs: &[ast::attribute]) -> @ast::item {
1919 let lo = p.get_last_lo_pos();
1920 let id = parse_ident(p);
1921 expect(p, token::LBRACE);
1922 let inner_attrs = parse_inner_attrs_and_next(p);
1923 let first_item_outer_attrs = inner_attrs.next;
1924 let m = parse_mod_items(p, token::RBRACE, first_item_outer_attrs);
1925 let hi = p.get_hi_pos();
1926 expect(p, token::RBRACE);
1927 ret mk_item(p, lo, hi, id, ast::item_mod(m), attrs + inner_attrs.inner);
1930 fn parse_item_native_type(p: &parser, attrs: &[ast::attribute]) ->
1932 let t = parse_type_decl(p);
1933 let hi = p.get_hi_pos();
1934 expect(p, token::SEMI);
1935 ret @{ident: t.ident,
1937 node: ast::native_item_ty,
1939 span: ast_util::mk_sp(t.lo, hi)};
1942 fn parse_item_native_fn(p: &parser, attrs: &[ast::attribute]) ->
1944 let lo = p.get_last_lo_pos();
1945 let t = parse_fn_header(p);
1946 let decl = parse_fn_decl(p, ast::impure_fn, ast::il_normal);
1947 let link_name = none;
1948 if p.peek() == token::EQ { p.bump(); link_name = some(parse_str(p)); }
1949 let hi = p.get_hi_pos();
1950 expect(p, token::SEMI);
1951 ret @{ident: t.ident,
1953 node: ast::native_item_fn(link_name, decl, t.tps),
1955 span: ast_util::mk_sp(lo, hi)};
1958 fn parse_native_item(p: &parser, attrs: &[ast::attribute]) ->
1960 if eat_word(p, "type") {
1961 ret parse_item_native_type(p, attrs);
1962 } else if eat_word(p, "fn") {
1963 ret parse_item_native_fn(p, attrs);
1964 } else { unexpected(p, p.peek()); }
1967 fn parse_native_mod_items(p: &parser, native_name: &str, abi: ast::native_abi,
1968 first_item_attrs: &[ast::attribute]) ->
1970 // Shouldn't be any view items since we've already parsed an item attr
1972 if vec::len(first_item_attrs) == 0u {
1973 parse_native_view(p)
1975 let items: [@ast::native_item] = [];
1976 let initial_attrs = first_item_attrs;
1977 while p.peek() != token::RBRACE {
1978 let attrs = initial_attrs + parse_outer_attributes(p);
1980 items += [parse_native_item(p, attrs)];
1982 ret {native_name: native_name,
1984 view_items: view_items,
1988 fn parse_item_native_mod(p: &parser, attrs: &[ast::attribute]) -> @ast::item {
1989 let lo = p.get_last_lo_pos();
1990 let abi = ast::native_abi_cdecl;
1991 if !is_word(p, "mod") {
1992 let t = parse_str(p);
1993 if str::eq(t, "cdecl") {
1994 } else if str::eq(t, "rust") {
1995 abi = ast::native_abi_rust;
1996 } else if str::eq(t, "llvm") {
1997 abi = ast::native_abi_llvm;
1998 } else if str::eq(t, "rust-intrinsic") {
1999 abi = ast::native_abi_rust_intrinsic;
2000 } else if str::eq(t, "x86stdcall") {
2001 abi = ast::native_abi_x86stdcall;
2002 } else { p.fatal("unsupported abi: " + t); }
2004 expect_word(p, "mod");
2005 let id = parse_ident(p);
2007 if p.peek() == token::EQ {
2008 expect(p, token::EQ);
2009 native_name = parse_str(p);
2010 } else { native_name = id; }
2011 expect(p, token::LBRACE);
2012 let more_attrs = parse_inner_attrs_and_next(p);
2013 let inner_attrs = more_attrs.inner;
2014 let first_item_outer_attrs = more_attrs.next;
2016 parse_native_mod_items(p, native_name, abi, first_item_outer_attrs);
2017 let hi = p.get_hi_pos();
2018 expect(p, token::RBRACE);
2019 ret mk_item(p, lo, hi, id, ast::item_native_mod(m), attrs + inner_attrs);
2022 fn parse_type_decl(p: &parser) -> {lo: uint, ident: ast::ident} {
2023 let lo = p.get_last_lo_pos();
2024 let id = parse_ident(p);
2025 ret {lo: lo, ident: id};
2028 fn parse_item_type(p: &parser, attrs: &[ast::attribute]) -> @ast::item {
2029 let t = parse_type_decl(p);
2030 let tps = parse_ty_params(p);
2031 expect(p, token::EQ);
2032 let ty = parse_ty(p, false);
2033 let hi = p.get_hi_pos();
2034 expect(p, token::SEMI);
2035 ret mk_item(p, t.lo, hi, t.ident, ast::item_ty(ty, tps), attrs);
2038 fn parse_item_tag(p: &parser, attrs: &[ast::attribute]) -> @ast::item {
2039 let lo = p.get_last_lo_pos();
2040 let id = parse_ident(p);
2041 let ty_params = parse_ty_params(p);
2042 let variants: [ast::variant] = [];
2044 if p.peek() == token::EQ {
2045 if p.get_bad_expr_words().contains_key(id) {
2046 p.fatal("found " + id + " in tag constructor position");
2049 let ty = parse_ty(p, false);
2050 expect(p, token::SEMI);
2052 spanned(ty.span.lo, ty.span.hi,
2054 args: [{ty: ty, id: p.get_id()}],
2056 ret mk_item(p, lo, ty.span.hi, id,
2057 ast::item_tag([variant], ty_params), attrs);
2059 expect(p, token::LBRACE);
2060 while p.peek() != token::RBRACE {
2063 token::IDENT(name, _) {
2065 let vlo = p.get_lo_pos();
2067 let args: [ast::variant_arg] = [];
2068 let vhi = p.get_hi_pos();
2072 parse_seq(token::LPAREN, token::RPAREN,
2073 some(token::COMMA), bind parse_ty(_, false), p);
2074 for ty: @ast::ty in arg_tys.node {
2075 args += [{ty: ty, id: p.get_id()}];
2077 vhi = arg_tys.span.hi;
2081 expect(p, token::SEMI);
2083 let vr = {name: p.get_str(name), args: args, id: p.get_id()};
2084 variants += [spanned(vlo, vhi, vr)];
2086 token::RBRACE. {/* empty */ }
2088 p.fatal("expected name of variant or '}' but found " +
2089 token::to_str(p.get_reader(), tok));
2093 let hi = p.get_hi_pos();
2095 ret mk_item(p, lo, hi, id, ast::item_tag(variants, ty_params), attrs);
2098 fn parse_auth(p: &parser) -> ast::_auth {
2099 if eat_word(p, "unsafe") {
2100 ret ast::auth_unsafe;
2101 } else { unexpected(p, p.peek()); }
2104 fn parse_item(p: &parser, attrs: &[ast::attribute]) -> option::t<@ast::item> {
2105 if eat_word(p, "const") {
2106 ret some(parse_item_const(p, attrs));
2107 } else if eat_word(p, "inline") {
2108 expect_word(p, "fn");
2109 ret some(parse_item_fn_or_iter(p, ast::impure_fn, ast::proto_fn,
2110 attrs, ast::il_inline));
2111 } else if is_word(p, "fn") && p.look_ahead(1u) != token::LPAREN {
2113 ret some(parse_item_fn_or_iter(p, ast::impure_fn, ast::proto_fn,
2114 attrs, ast::il_normal));
2115 } else if eat_word(p, "pure") {
2116 expect_word(p, "fn");
2117 ret some(parse_item_fn_or_iter(p, ast::pure_fn, ast::proto_fn, attrs,
2119 } else if eat_word(p, "iter") {
2120 ret some(parse_item_fn_or_iter(p, ast::impure_fn, ast::proto_iter,
2121 attrs, ast::il_normal));
2122 } else if eat_word(p, "mod") {
2123 ret some(parse_item_mod(p, attrs));
2124 } else if eat_word(p, "native") {
2125 ret some(parse_item_native_mod(p, attrs));
2127 if eat_word(p, "type") {
2128 ret some(parse_item_type(p, attrs));
2129 } else if eat_word(p, "tag") {
2130 ret some(parse_item_tag(p, attrs));
2131 } else if is_word(p, "obj") && p.look_ahead(1u) != token::LPAREN {
2133 ret some(parse_item_obj(p, attrs));
2134 } else if eat_word(p, "resource") {
2135 ret some(parse_item_res(p, attrs));
2136 } else { ret none; }
2139 // A type to distingush between the parsing of item attributes or syntax
2140 // extensions, which both begin with token.POUND
2141 type attr_or_ext = option::t<either::t<[ast::attribute], @ast::expr>>;
2143 fn parse_outer_attrs_or_ext(p: &parser) -> attr_or_ext {
2144 if p.peek() == token::POUND {
2145 let lo = p.get_lo_pos();
2147 if p.peek() == token::LBRACKET {
2148 let first_attr = parse_attribute_naked(p, ast::attr_outer, lo);
2149 ret some(left([first_attr] + parse_outer_attributes(p)));
2150 } else if !(p.peek() == token::LT || p.peek() == token::LBRACKET) {
2151 ret some(right(parse_syntax_ext_naked(p, lo)));
2152 } else { ret none; }
2153 } else { ret none; }
2156 // Parse attributes that appear before an item
2157 fn parse_outer_attributes(p: &parser) -> [ast::attribute] {
2158 let attrs: [ast::attribute] = [];
2159 while p.peek() == token::POUND {
2160 attrs += [parse_attribute(p, ast::attr_outer)];
2165 fn parse_attribute(p: &parser, style: ast::attr_style) -> ast::attribute {
2166 let lo = p.get_lo_pos();
2167 expect(p, token::POUND);
2168 ret parse_attribute_naked(p, style, lo);
2171 fn parse_attribute_naked(p: &parser, style: ast::attr_style, lo: uint) ->
2173 expect(p, token::LBRACKET);
2174 let meta_item = parse_meta_item(p);
2175 expect(p, token::RBRACKET);
2176 let hi = p.get_hi_pos();
2177 ret spanned(lo, hi, {style: style, value: *meta_item});
2180 // Parse attributes that appear after the opening of an item, each terminated
2181 // by a semicolon. In addition to a vector of inner attributes, this function
2182 // also returns a vector that may contain the first outer attribute of the
2183 // next item (since we can't know whether the attribute is an inner attribute
2184 // of the containing item or an outer attribute of the first contained item
2185 // until we see the semi).
2186 fn parse_inner_attrs_and_next(p: &parser) ->
2187 {inner: [ast::attribute], next: [ast::attribute]} {
2188 let inner_attrs: [ast::attribute] = [];
2189 let next_outer_attrs: [ast::attribute] = [];
2190 while p.peek() == token::POUND {
2191 let attr = parse_attribute(p, ast::attr_inner);
2192 if p.peek() == token::SEMI {
2194 inner_attrs += [attr];
2196 // It's not really an inner attribute
2198 spanned(attr.span.lo, attr.span.hi,
2199 {style: ast::attr_outer, value: attr.node.value});
2200 next_outer_attrs += [outer_attr];
2204 ret {inner: inner_attrs, next: next_outer_attrs};
2207 fn parse_meta_item(p: &parser) -> @ast::meta_item {
2208 let lo = p.get_lo_pos();
2209 let ident = parse_ident(p);
2213 let lit = parse_lit(p);
2214 let hi = p.get_hi_pos();
2215 ret @spanned(lo, hi, ast::meta_name_value(ident, lit));
2218 let inner_items = parse_meta_seq(p);
2219 let hi = p.get_hi_pos();
2220 ret @spanned(lo, hi, ast::meta_list(ident, inner_items));
2223 let hi = p.get_hi_pos();
2224 ret @spanned(lo, hi, ast::meta_word(ident));
2229 fn parse_meta_seq(p: &parser) -> [@ast::meta_item] {
2230 ret parse_seq(token::LPAREN, token::RPAREN, some(token::COMMA),
2231 parse_meta_item, p).node;
2234 fn parse_optional_meta(p: &parser) -> [@ast::meta_item] {
2235 alt p.peek() { token::LPAREN. { ret parse_meta_seq(p); } _ { ret []; } }
2238 fn parse_use(p: &parser) -> ast::view_item_ {
2239 let ident = parse_ident(p);
2240 let metadata = parse_optional_meta(p);
2241 ret ast::view_item_use(ident, metadata, p.get_id());
2244 fn parse_rest_import_name(p: &parser, first: &ast::ident,
2245 def_ident: option::t<ast::ident>) ->
2247 let identifiers: [ast::ident] = [first];
2248 let glob: bool = false;
2249 let from_idents = option::none::<[ast::import_ident]>;
2252 token::SEMI. { break; }
2254 if glob { p.fatal("cannot path into a glob"); }
2255 if option::is_some(from_idents) {
2256 p.fatal("cannot path into import list");
2260 _ { p.fatal("expecting '::' or ';'"); }
2263 token::IDENT(_, _) { identifiers += [parse_ident(p)]; }
2267 //the lexer can't tell the different kinds of stars apart ) :
2268 token::BINOP(token::STAR.) {
2276 fn parse_import_ident(p: &parser) -> ast::import_ident {
2277 let lo = p.get_lo_pos();
2278 let ident = parse_ident(p);
2279 let hi = p.get_hi_pos();
2280 ret spanned(lo, hi, {name: ident, id: p.get_id()});
2283 parse_seq(token::LBRACE, token::RBRACE, some(token::COMMA),
2284 parse_import_ident, p).node;
2285 if vec::is_empty(from_idents_) {
2286 p.fatal("at least one import is required");
2288 from_idents = some(from_idents_);
2294 p.fatal("expecting an identifier, or '*'");
2300 if glob { p.fatal("globbed imports can't be renamed"); }
2301 if option::is_some(from_idents) {
2302 p.fatal("can't rename import list");
2304 ret ast::view_item_import(i, identifiers, p.get_id());
2308 ret ast::view_item_import_glob(identifiers, p.get_id());
2309 } else if option::is_some(from_idents) {
2310 ret ast::view_item_import_from(identifiers,
2311 option::get(from_idents),
2314 let len = vec::len(identifiers);
2315 ret ast::view_item_import(identifiers[len - 1u], identifiers,
2322 fn parse_full_import_name(p: &parser, def_ident: &ast::ident) ->
2325 token::IDENT(i, _) {
2327 ret parse_rest_import_name(p, p.get_str(i), some(def_ident));
2329 _ { p.fatal("expecting an identifier"); }
2333 fn parse_import(p: &parser) -> ast::view_item_ {
2335 token::IDENT(i, _) {
2340 ret parse_full_import_name(p, p.get_str(i));
2342 _ { ret parse_rest_import_name(p, p.get_str(i), none); }
2345 _ { p.fatal("expecting an identifier"); }
2349 fn parse_export(p: &parser) -> ast::view_item_ {
2351 parse_seq_to_before_end(token::SEMI, option::some(token::COMMA),
2353 ret ast::view_item_export(ids, p.get_id());
2356 fn parse_view_item(p: &parser) -> @ast::view_item {
2357 let lo = p.get_lo_pos();
2359 if eat_word(p, "use") {
2361 } else if eat_word(p, "import") {
2363 } else if eat_word(p, "export") { parse_export(p) } else { fail };
2364 let hi = p.get_lo_pos();
2365 expect(p, token::SEMI);
2366 ret @spanned(lo, hi, the_item);
2369 fn is_view_item(p: &parser) -> bool {
2371 token::IDENT(sid, false) {
2372 let st = p.get_str(sid);
2373 ret str::eq(st, "use") || str::eq(st, "import") ||
2374 str::eq(st, "export");
2380 fn parse_view(p: &parser) -> [@ast::view_item] {
2381 let items: [@ast::view_item] = [];
2382 while is_view_item(p) { items += [parse_view_item(p)]; }
2386 fn parse_native_view(p: &parser) -> [@ast::view_item] {
2387 let items: [@ast::view_item] = [];
2388 while is_view_item(p) { items += [parse_view_item(p)]; }
2392 fn parse_crate_from_source_file(input: &str, cfg: &ast::crate_cfg,
2393 sess: &parse_sess) -> @ast::crate {
2394 let p = new_parser_from_file(sess, cfg, input, 0u, 0u, SOURCE_FILE);
2395 ret parse_crate_mod(p, cfg);
2398 fn parse_crate_from_source_str(name: &str, source: &str, cfg: &ast::crate_cfg,
2399 sess: &parse_sess) -> @ast::crate {
2400 let ftype = SOURCE_FILE;
2401 let filemap = codemap::new_filemap(name, 0u, 0u);
2402 sess.cm.files += [filemap];
2403 let itr = @interner::mk(str::hash, str::eq);
2404 let rdr = lexer::new_reader(sess.cm, source, filemap, itr);
2405 let p = new_parser(sess, cfg, rdr, ftype);
2406 ret parse_crate_mod(p, cfg);
2409 // Parses a source module as a crate
2410 fn parse_crate_mod(p: &parser, _cfg: &ast::crate_cfg) -> @ast::crate {
2411 let lo = p.get_lo_pos();
2412 let crate_attrs = parse_inner_attrs_and_next(p);
2413 let first_item_outer_attrs = crate_attrs.next;
2414 let m = parse_mod_items(p, token::EOF, first_item_outer_attrs);
2415 ret @spanned(lo, p.get_lo_pos(),
2418 attrs: crate_attrs.inner,
2419 config: p.get_cfg()});
2422 fn parse_str(p: &parser) -> str {
2424 token::LIT_STR(s) { p.bump(); ret p.get_str(s); }
2429 // Logic for parsing crate files (.rc)
2431 // Each crate file is a sequence of directives.
2433 // Each directive imperatively extends its environment with 0 or more items.
2434 fn parse_crate_directive(p: &parser, first_outer_attr: &[ast::attribute]) ->
2435 ast::crate_directive {
2437 // Collect the next attributes
2438 let outer_attrs = first_outer_attr + parse_outer_attributes(p);
2439 // In a crate file outer attributes are only going to apply to mods
2440 let expect_mod = vec::len(outer_attrs) > 0u;
2442 let lo = p.get_lo_pos();
2443 if expect_mod || is_word(p, "mod") {
2444 expect_word(p, "mod");
2445 let id = parse_ident(p);
2448 token::EQ. { p.bump(); some(parse_str(p)) }
2455 // mod x = "foo.rs";
2457 let hi = p.get_hi_pos();
2459 ret spanned(lo, hi, ast::cdir_src_mod(id, file_opt, outer_attrs));
2464 // mod x = "foo_dir" { ...directives... }
2467 let inner_attrs = parse_inner_attrs_and_next(p);
2468 let mod_attrs = outer_attrs + inner_attrs.inner;
2469 let next_outer_attr = inner_attrs.next;
2471 parse_crate_directives(p, token::RBRACE, next_outer_attr);
2472 let hi = p.get_hi_pos();
2473 expect(p, token::RBRACE);
2475 ast::cdir_dir_mod(id, file_opt, cdirs, mod_attrs));
2477 t { unexpected(p, t); }
2479 } else if eat_word(p, "auth") {
2480 let n = parse_path(p);
2481 expect(p, token::EQ);
2482 let a = parse_auth(p);
2483 let hi = p.get_hi_pos();
2484 expect(p, token::SEMI);
2485 ret spanned(lo, hi, ast::cdir_auth(n, a));
2486 } else if is_view_item(p) {
2487 let vi = parse_view_item(p);
2488 ret spanned(lo, vi.span.hi, ast::cdir_view_item(vi));
2489 } else { ret p.fatal("expected crate directive"); }
2492 fn parse_crate_directives(p: &parser, term: token::token,
2493 first_outer_attr: &[ast::attribute]) ->
2494 [@ast::crate_directive] {
2496 // This is pretty ugly. If we have an outer attribute then we can't accept
2497 // seeing the terminator next, so if we do see it then fail the same way
2498 // parse_crate_directive would
2499 if vec::len(first_outer_attr) > 0u && p.peek() == term {
2500 expect_word(p, "mod");
2503 let cdirs: [@ast::crate_directive] = [];
2504 while p.peek() != term {
2505 let cdir = @parse_crate_directive(p, first_outer_attr);
2511 fn parse_crate_from_crate_file(input: &str, cfg: &ast::crate_cfg,
2512 sess: &parse_sess) -> @ast::crate {
2513 let p = new_parser_from_file(sess, cfg, input, 0u, 0u, CRATE_FILE);
2514 let lo = p.get_lo_pos();
2515 let prefix = std::fs::dirname(p.get_filemap().name);
2516 let leading_attrs = parse_inner_attrs_and_next(p);
2517 let crate_attrs = leading_attrs.inner;
2518 let first_cdir_attr = leading_attrs.next;
2519 let cdirs = parse_crate_directives(p, token::EOF, first_cdir_attr);
2520 let deps: [str] = [];
2523 mode: eval::mode_parse,
2526 mutable chpos: p.get_chpos(),
2527 mutable byte_pos: p.get_byte_pos(),
2529 let m = eval::eval_crate_directives_to_mod(cx, cdirs, prefix);
2530 let hi = p.get_hi_pos();
2531 expect(p, token::EOF);
2532 ret @spanned(lo, hi,
2536 config: p.get_cfg()});
2539 fn parse_crate_from_file(input: &str, cfg: &ast::crate_cfg, sess: &parse_sess)
2541 if str::ends_with(input, ".rc") {
2542 parse_crate_from_crate_file(input, cfg, sess)
2543 } else if str::ends_with(input, ".rs") {
2544 parse_crate_from_source_file(input, cfg, sess)
2546 codemap::emit_error(none, "unknown input file type: " + input,
2556 // indent-tabs-mode: nil
2557 // c-basic-offset: 4
2558 // buffer-file-coding-system: utf-8-unix
2559 // compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";