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 //! The main parser interface
14 use codemap::{Span, CodeMap, FileMap};
15 use diagnostic::{SpanHandler, mk_span_handler, default_handler, Auto};
16 use parse::attr::ParserAttr;
17 use parse::parser::Parser;
20 use std::cell::{Cell, RefCell};
38 /// Info about a parsing session.
39 pub struct ParseSess {
40 pub span_diagnostic: SpanHandler, // better be the same as the one in the reader!
41 /// Used to determine and report recursive mod inclusions
42 included_mod_stack: RefCell<Vec<Path>>,
43 pub node_id: Cell<ast::NodeId>,
46 pub fn new_parse_sess() -> ParseSess {
48 span_diagnostic: mk_span_handler(default_handler(Auto, None), CodeMap::new()),
49 included_mod_stack: RefCell::new(Vec::new()),
50 node_id: Cell::new(1),
54 pub fn new_parse_sess_special_handler(sh: SpanHandler) -> ParseSess {
57 included_mod_stack: RefCell::new(Vec::new()),
58 node_id: Cell::new(1),
63 pub fn next_node_id(&self) -> ast::NodeId {
64 self.reserve_node_ids(1)
66 pub fn reserve_node_ids(&self, count: ast::NodeId) -> ast::NodeId {
67 let v = self.node_id.get();
69 match v.checked_add(count) {
70 Some(next) => { self.node_id.set(next); }
71 None => panic!("Input too large, ran out of node ids!")
78 // a bunch of utility functions of the form parse_<thing>_from_<source>
79 // where <thing> includes crate, expr, item, stmt, tts, and one that
80 // uses a HOF to parse anything, and <source> includes file and
83 pub fn parse_crate_from_file(
85 cfg: ast::CrateConfig,
88 new_parser_from_file(sess, cfg, input).parse_crate_mod()
89 // why is there no p.abort_if_errors here?
92 pub fn parse_crate_attrs_from_file(
94 cfg: ast::CrateConfig,
96 ) -> Vec<ast::Attribute> {
97 let mut parser = new_parser_from_file(sess, cfg, input);
98 let (inner, _) = parser.parse_inner_attrs_and_next();
102 pub fn parse_crate_from_source_str(name: String,
104 cfg: ast::CrateConfig,
107 let mut p = new_parser_from_source_str(sess,
111 maybe_aborted(p.parse_crate_mod(),p)
114 pub fn parse_crate_attrs_from_source_str(name: String,
116 cfg: ast::CrateConfig,
118 -> Vec<ast::Attribute> {
119 let mut p = new_parser_from_source_str(sess,
123 let (inner, _) = maybe_aborted(p.parse_inner_attrs_and_next(),p);
127 pub fn parse_expr_from_source_str(name: String,
129 cfg: ast::CrateConfig,
132 let mut p = new_parser_from_source_str(sess, cfg, name, source);
133 maybe_aborted(p.parse_expr(), p)
136 pub fn parse_item_from_source_str(name: String,
138 cfg: ast::CrateConfig,
140 -> Option<P<ast::Item>> {
141 let mut p = new_parser_from_source_str(sess, cfg, name, source);
142 maybe_aborted(p.parse_item_with_outer_attributes(),p)
145 pub fn parse_meta_from_source_str(name: String,
147 cfg: ast::CrateConfig,
149 -> P<ast::MetaItem> {
150 let mut p = new_parser_from_source_str(sess, cfg, name, source);
151 maybe_aborted(p.parse_meta_item(),p)
154 pub fn parse_stmt_from_source_str(name: String,
156 cfg: ast::CrateConfig,
157 attrs: Vec<ast::Attribute> ,
160 let mut p = new_parser_from_source_str(
166 maybe_aborted(p.parse_stmt(attrs),p)
169 // Note: keep in sync with `with_hygiene::parse_tts_from_source_str`
170 // until #16472 is resolved.
172 // Warning: This parses with quote_depth > 0, which is not the default.
173 pub fn parse_tts_from_source_str(name: String,
175 cfg: ast::CrateConfig,
177 -> Vec<ast::TokenTree> {
178 let mut p = new_parser_from_source_str(
185 // right now this is re-creating the token trees from ... token trees.
186 maybe_aborted(p.parse_all_token_trees(),p)
189 // Note: keep in sync with `with_hygiene::new_parser_from_source_str`
190 // until #16472 is resolved.
191 // Create a new parser from a source string
192 pub fn new_parser_from_source_str<'a>(sess: &'a ParseSess,
193 cfg: ast::CrateConfig,
197 filemap_to_parser(sess, string_to_filemap(sess, source, name), cfg)
200 /// Create a new parser, handling errors as appropriate
201 /// if the file doesn't exist
202 pub fn new_parser_from_file<'a>(sess: &'a ParseSess,
203 cfg: ast::CrateConfig,
204 path: &Path) -> Parser<'a> {
205 filemap_to_parser(sess, file_to_filemap(sess, path, None), cfg)
208 /// Given a session, a crate config, a path, and a span, add
209 /// the file at the given path to the codemap, and return a parser.
210 /// On an error, use the given span as the source of the problem.
211 pub fn new_sub_parser_from_file<'a>(sess: &'a ParseSess,
212 cfg: ast::CrateConfig,
214 owns_directory: bool,
215 module_name: Option<String>,
216 sp: Span) -> Parser<'a> {
217 let mut p = filemap_to_parser(sess, file_to_filemap(sess, path, Some(sp)), cfg);
218 p.owns_directory = owns_directory;
219 p.root_module_name = module_name;
223 // Note: keep this in sync with `with_hygiene::filemap_to_parser` until
224 // #16472 is resolved.
225 /// Given a filemap and config, return a parser
226 pub fn filemap_to_parser<'a>(sess: &'a ParseSess,
227 filemap: Rc<FileMap>,
228 cfg: ast::CrateConfig) -> Parser<'a> {
229 tts_to_parser(sess, filemap_to_tts(sess, filemap), cfg)
232 // must preserve old name for now, because quote! from the *existing*
233 // compiler expands into it
234 pub fn new_parser_from_tts<'a>(sess: &'a ParseSess,
235 cfg: ast::CrateConfig,
236 tts: Vec<ast::TokenTree>) -> Parser<'a> {
237 tts_to_parser(sess, tts, cfg)
243 /// Given a session and a path and an optional span (for error reporting),
244 /// add the path to the session's codemap and return the new filemap.
245 pub fn file_to_filemap(sess: &ParseSess, path: &Path, spanopt: Option<Span>)
247 let err = |&: msg: &str| {
249 Some(sp) => sess.span_diagnostic.span_fatal(sp, msg),
250 None => sess.span_diagnostic.handler().fatal(msg),
253 let bytes = match File::open(path).read_to_end() {
256 err(&format!("couldn't read {:?}: {:?}",
262 match str::from_utf8(&bytes[]).ok() {
264 return string_to_filemap(sess, s.to_string(),
265 path.as_str().unwrap().to_string())
268 err(&format!("{:?} is not UTF-8 encoded", path.display())[])
274 /// Given a session and a string, add the string to
275 /// the session's codemap and return the new filemap
276 pub fn string_to_filemap(sess: &ParseSess, source: String, path: String)
278 sess.span_diagnostic.cm.new_filemap(path, source)
281 // Note: keep this in sync with `with_hygiene::filemap_to_tts` (apart
282 // from the StringReader constructor), until #16472 is resolved.
283 /// Given a filemap, produce a sequence of token-trees
284 pub fn filemap_to_tts(sess: &ParseSess, filemap: Rc<FileMap>)
285 -> Vec<ast::TokenTree> {
286 // it appears to me that the cfg doesn't matter here... indeed,
287 // parsing tt's probably shouldn't require a parser at all.
288 let cfg = Vec::new();
289 let srdr = lexer::StringReader::new(&sess.span_diagnostic, filemap);
290 let mut p1 = Parser::new(sess, cfg, box srdr);
291 p1.parse_all_token_trees()
294 /// Given tts and cfg, produce a parser
295 pub fn tts_to_parser<'a>(sess: &'a ParseSess,
296 tts: Vec<ast::TokenTree>,
297 cfg: ast::CrateConfig) -> Parser<'a> {
298 let trdr = lexer::new_tt_reader(&sess.span_diagnostic, None, None, tts);
299 let mut p = Parser::new(sess, cfg, box trdr);
300 p.check_unknown_macro_variable();
304 // FIXME (Issue #16472): The `with_hygiene` mod should go away after
305 // ToToken impls are revised to go directly to token-trees.
306 pub mod with_hygiene {
308 use codemap::FileMap;
309 use parse::parser::Parser;
311 use super::ParseSess;
312 use super::{maybe_aborted, string_to_filemap, tts_to_parser};
314 // Note: keep this in sync with `super::parse_tts_from_source_str` until
315 // #16472 is resolved.
317 // Warning: This parses with quote_depth > 0, which is not the default.
318 pub fn parse_tts_from_source_str(name: String,
320 cfg: ast::CrateConfig,
321 sess: &ParseSess) -> Vec<ast::TokenTree> {
322 let mut p = new_parser_from_source_str(
329 // right now this is re-creating the token trees from ... token trees.
330 maybe_aborted(p.parse_all_token_trees(),p)
333 // Note: keep this in sync with `super::new_parser_from_source_str` until
334 // #16472 is resolved.
335 // Create a new parser from a source string
336 fn new_parser_from_source_str<'a>(sess: &'a ParseSess,
337 cfg: ast::CrateConfig,
339 source: String) -> Parser<'a> {
340 filemap_to_parser(sess, string_to_filemap(sess, source, name), cfg)
343 // Note: keep this in sync with `super::filemap_to_parserr` until
344 // #16472 is resolved.
345 /// Given a filemap and config, return a parser
346 fn filemap_to_parser<'a>(sess: &'a ParseSess,
347 filemap: Rc<FileMap>,
348 cfg: ast::CrateConfig) -> Parser<'a> {
349 tts_to_parser(sess, filemap_to_tts(sess, filemap), cfg)
352 // Note: keep this in sync with `super::filemap_to_tts` until
353 // #16472 is resolved.
354 /// Given a filemap, produce a sequence of token-trees
355 fn filemap_to_tts(sess: &ParseSess, filemap: Rc<FileMap>)
356 -> Vec<ast::TokenTree> {
357 // it appears to me that the cfg doesn't matter here... indeed,
358 // parsing tt's probably shouldn't require a parser at all.
359 use super::lexer::make_reader_with_embedded_idents as make_reader;
360 let cfg = Vec::new();
361 let srdr = make_reader(&sess.span_diagnostic, filemap);
362 let mut p1 = Parser::new(sess, cfg, box srdr);
363 p1.parse_all_token_trees()
367 /// Abort if necessary
368 pub fn maybe_aborted<T>(result: T, mut p: Parser) -> T {
373 /// Parse a string representing a character literal into its final form.
374 /// Rather than just accepting/rejecting a given literal, unescapes it as
375 /// well. Can take any slice prefixed by a character escape. Returns the
376 /// character and the number of characters consumed.
377 pub fn char_lit(lit: &str) -> (char, int) {
378 use std::{num, char};
380 let mut chars = lit.chars();
381 let c = match (chars.next(), chars.next()) {
382 (Some(c), None) if c != '\\' => return (c, 1),
383 (Some('\\'), Some(c)) => match c {
393 _ => panic!("lexer accepted invalid char escape `{}`", lit)
397 Some(x) => return (x, 2),
401 let msg = format!("lexer should have rejected a bad character escape {}", lit);
404 fn esc(len: uint, lit: &str) -> Option<(char, int)> {
405 num::from_str_radix(&lit[2..len], 16)
406 .and_then(char::from_u32)
407 .map(|x| (x, len as int))
410 let unicode_escape = |&: | -> Option<(char, int)>
411 if lit.as_bytes()[2] == b'{' {
412 let idx = lit.find('}').expect(msg2);
413 let subslice = &lit[3..idx];
414 num::from_str_radix(subslice, 16)
415 .and_then(char::from_u32)
416 .map(|x| (x, subslice.chars().count() as int + 4))
422 return match lit.as_bytes()[1] as char {
423 'x' | 'X' => esc(4, lit),
424 'u' => unicode_escape(),
430 /// Parse a string representing a string literal into its final form. Does
432 pub fn str_lit(lit: &str) -> String {
433 debug!("parse_str_lit: given {}", lit.escape_default());
434 let mut res = String::with_capacity(lit.len());
436 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
437 let error = |&: i| format!("lexer should have rejected {} at {}", lit, i);
439 /// Eat everything up to a non-whitespace
440 fn eat<'a>(it: &mut iter::Peekable<(uint, char), str::CharIndices<'a>>) {
442 match it.peek().map(|x| x.1) {
443 Some(' ') | Some('\n') | Some('\r') | Some('\t') => {
451 let mut chars = lit.char_indices().peekable();
457 let ch = chars.peek().unwrap_or_else(|| {
458 panic!("{}", error(i).as_slice())
463 } else if ch == '\r' {
465 let ch = chars.peek().unwrap_or_else(|| {
466 panic!("{}", error(i).as_slice())
470 panic!("lexer accepted bare CR");
474 // otherwise, a normal escape
475 let (c, n) = char_lit(&lit[i..]);
476 for _ in range(0, n - 1) { // we don't need to move past the first \
483 let ch = chars.peek().unwrap_or_else(|| {
484 panic!("{}", error(i).as_slice())
488 panic!("lexer accepted bare CR");
500 res.shrink_to_fit(); // probably not going to do anything, unless there was an escape.
501 debug!("parse_str_lit: returning {}", res);
505 /// Parse a string representing a raw string literal into its final form. The
506 /// only operation this does is convert embedded CRLF into a single LF.
507 pub fn raw_str_lit(lit: &str) -> String {
508 debug!("raw_str_lit: given {}", lit.escape_default());
509 let mut res = String::with_capacity(lit.len());
511 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
512 let mut chars = lit.chars().peekable();
517 if *chars.peek().unwrap() != '\n' {
518 panic!("lexer accepted bare CR");
534 // check if `s` looks like i32 or u1234 etc.
535 fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
537 first_chars.contains(&s.char_at(0)) &&
538 s[1..].chars().all(|c| '0' <= c && c <= '9')
541 fn filtered_float_lit(data: token::InternedString, suffix: Option<&str>,
542 sd: &SpanHandler, sp: Span) -> ast::Lit_ {
543 debug!("filtered_float_lit: {}, {:?}", data, suffix);
545 Some("f32") => ast::LitFloat(data, ast::TyF32),
546 Some("f64") => ast::LitFloat(data, ast::TyF64),
548 if suf.len() >= 2 && looks_like_width_suffix(&['f'], suf) {
549 // if it looks like a width, lets try to be helpful.
550 sd.span_err(sp, &*format!("illegal width `{}` for float literal, \
551 valid widths are 32 and 64", &suf[1..]));
553 sd.span_err(sp, &*format!("illegal suffix `{}` for float literal, \
554 valid suffixes are `f32` and `f64`", suf));
557 ast::LitFloatUnsuffixed(data)
559 None => ast::LitFloatUnsuffixed(data)
562 pub fn float_lit(s: &str, suffix: Option<&str>, sd: &SpanHandler, sp: Span) -> ast::Lit_ {
563 debug!("float_lit: {:?}, {:?}", s, suffix);
564 // FIXME #2252: bounds checking float literals is defered until trans
565 let s = s.chars().filter(|&c| c != '_').collect::<String>();
566 let data = token::intern_and_get_ident(&*s);
567 filtered_float_lit(data, suffix, sd, sp)
570 /// Parse a string representing a byte literal into its final form. Similar to `char_lit`
571 pub fn byte_lit(lit: &str) -> (u8, uint) {
572 let err = |&: i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
575 (lit.as_bytes()[0], 1)
577 assert!(lit.as_bytes()[0] == b'\\', err(0i));
578 let b = match lit.as_bytes()[1] {
587 match ::std::num::from_str_radix::<u64>(&lit[2..4], 16) {
594 None => panic!(err(3))
602 pub fn binary_lit(lit: &str) -> Rc<Vec<u8>> {
603 let mut res = Vec::with_capacity(lit.len());
605 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
606 let error = |&: i| format!("lexer should have rejected {} at {}", lit, i);
608 /// Eat everything up to a non-whitespace
609 fn eat<'a, I: Iterator<Item=(uint, u8)>>(it: &mut iter::Peekable<(uint, u8), I>) {
611 match it.peek().map(|x| x.1) {
612 Some(b' ') | Some(b'\n') | Some(b'\r') | Some(b'\t') => {
620 // binary literals *must* be ASCII, but the escapes don't have to be
621 let mut chars = lit.bytes().enumerate().peekable();
624 Some((i, b'\\')) => {
626 match chars.peek().expect(em.as_slice()).1 {
627 b'\n' => eat(&mut chars),
630 if chars.peek().expect(em.as_slice()).1 != b'\n' {
631 panic!("lexer accepted bare CR");
636 // otherwise, a normal escape
637 let (c, n) = byte_lit(&lit[i..]);
638 // we don't need to move past the first \
639 for _ in range(0, n - 1) {
646 Some((i, b'\r')) => {
648 if chars.peek().expect(em.as_slice()).1 != b'\n' {
649 panic!("lexer accepted bare CR");
654 Some((_, c)) => res.push(c),
662 pub fn integer_lit(s: &str, suffix: Option<&str>, sd: &SpanHandler, sp: Span) -> ast::Lit_ {
663 // s can only be ascii, byte indexing is fine
665 let s2 = s.chars().filter(|&c| c != '_').collect::<String>();
668 debug!("integer_lit: {}, {:?}", s, suffix);
672 let mut ty = ast::UnsuffixedIntLit(ast::Plus);
674 if s.char_at(0) == '0' && s.len() > 1 {
683 // 1f64 and 2f32 etc. are valid float literals.
685 Some(suf) if looks_like_width_suffix(&['f'], suf) => {
687 16u => sd.span_err(sp, "hexadecimal float literal is not supported"),
688 8u => sd.span_err(sp, "octal float literal is not supported"),
689 2u => sd.span_err(sp, "binary float literal is not supported"),
692 let ident = token::intern_and_get_ident(&*s);
693 return filtered_float_lit(ident, suffix, sd, sp)
702 if let Some(suf) = suffix {
703 if suf.is_empty() { sd.span_bug(sp, "found empty literal suffix in Some")}
705 "i" => ast::SignedIntLit(ast::TyIs(true), ast::Plus),
706 "is" => ast::SignedIntLit(ast::TyIs(false), ast::Plus),
707 "i8" => ast::SignedIntLit(ast::TyI8, ast::Plus),
708 "i16" => ast::SignedIntLit(ast::TyI16, ast::Plus),
709 "i32" => ast::SignedIntLit(ast::TyI32, ast::Plus),
710 "i64" => ast::SignedIntLit(ast::TyI64, ast::Plus),
711 "u" => ast::UnsignedIntLit(ast::TyUs(true)),
712 "us" => ast::UnsignedIntLit(ast::TyUs(false)),
713 "u8" => ast::UnsignedIntLit(ast::TyU8),
714 "u16" => ast::UnsignedIntLit(ast::TyU16),
715 "u32" => ast::UnsignedIntLit(ast::TyU32),
716 "u64" => ast::UnsignedIntLit(ast::TyU64),
718 // i<digits> and u<digits> look like widths, so lets
719 // give an error message along those lines
720 if looks_like_width_suffix(&['i', 'u'], suf) {
721 sd.span_err(sp, &*format!("illegal width `{}` for integer literal; \
722 valid widths are 8, 16, 32 and 64",
725 sd.span_err(sp, &*format!("illegal suffix `{}` for numeric literal", suf));
733 debug!("integer_lit: the type is {:?}, base {:?}, the new string is {:?}, the original \
734 string was {:?}, the original suffix was {:?}", ty, base, s, orig, suffix);
736 let res: u64 = match ::std::num::from_str_radix(s, base) {
738 None => { sd.span_err(sp, "int literal is too large"); 0 }
742 let sign = ast::Sign::new(res);
744 ast::SignedIntLit(t, _) => ast::LitInt(res, ast::SignedIntLit(t, sign)),
745 ast::UnsuffixedIntLit(_) => ast::LitInt(res, ast::UnsuffixedIntLit(sign)),
746 us@ast::UnsignedIntLit(_) => ast::LitInt(res, us)
754 use codemap::{Span, BytePos, Pos, Spanned, NO_EXPANSION};
755 use owned_slice::OwnedSlice;
758 use attr::{first_attr_value_str_by_name, AttrMetaMethods};
759 use parse::parser::Parser;
760 use parse::token::{str_to_ident};
761 use print::pprust::view_item_to_string;
763 use util::parser_testing::{string_to_tts, string_to_parser};
764 use util::parser_testing::{string_to_expr, string_to_item};
765 use util::parser_testing::{string_to_stmt, string_to_view_item};
767 // produce a codemap::span
768 fn sp(a: u32, b: u32) -> Span {
769 Span {lo: BytePos(a), hi: BytePos(b), expn_id: NO_EXPANSION}
772 #[test] fn path_exprs_1() {
773 assert!(string_to_expr("a".to_string()) ==
775 id: ast::DUMMY_NODE_ID,
776 node: ast::ExprPath(ast::Path {
781 identifier: str_to_ident("a"),
782 parameters: ast::PathParameters::none(),
790 #[test] fn path_exprs_2 () {
791 assert!(string_to_expr("::a::b".to_string()) ==
793 id: ast::DUMMY_NODE_ID,
794 node: ast::ExprPath(ast::Path {
799 identifier: str_to_ident("a"),
800 parameters: ast::PathParameters::none(),
803 identifier: str_to_ident("b"),
804 parameters: ast::PathParameters::none(),
813 #[test] fn bad_path_expr_1() {
814 string_to_expr("::abc::def::return".to_string());
817 // check the token-tree-ization of macros
819 fn string_to_tts_macro () {
820 let tts = string_to_tts("macro_rules! zip (($a)=>($a))".to_string());
821 let tts: &[ast::TokenTree] = &tts[];
823 [ast::TtToken(_, token::Ident(name_macro_rules, token::Plain)),
824 ast::TtToken(_, token::Not),
825 ast::TtToken(_, token::Ident(name_zip, token::Plain)),
826 ast::TtDelimited(_, ref macro_delimed)]
827 if name_macro_rules.as_str() == "macro_rules"
828 && name_zip.as_str() == "zip" => {
829 match ¯o_delimed.tts[] {
830 [ast::TtDelimited(_, ref first_delimed),
831 ast::TtToken(_, token::FatArrow),
832 ast::TtDelimited(_, ref second_delimed)]
833 if macro_delimed.delim == token::Paren => {
834 match &first_delimed.tts[] {
835 [ast::TtToken(_, token::Dollar),
836 ast::TtToken(_, token::Ident(name, token::Plain))]
837 if first_delimed.delim == token::Paren
838 && name.as_str() == "a" => {},
839 _ => panic!("value 3: {:?}", **first_delimed),
841 match &second_delimed.tts[] {
842 [ast::TtToken(_, token::Dollar),
843 ast::TtToken(_, token::Ident(name, token::Plain))]
844 if second_delimed.delim == token::Paren
845 && name.as_str() == "a" => {},
846 _ => panic!("value 4: {:?}", **second_delimed),
849 _ => panic!("value 2: {:?}", **macro_delimed),
852 _ => panic!("value: {:?}",tts),
857 fn string_to_tts_1 () {
858 let tts = string_to_tts("fn a (b : int) { b; }".to_string());
859 assert_eq!(json::encode(&tts),
862 \"variant\":\"TtToken\",\
866 \"variant\":\"Ident\",\
875 \"variant\":\"TtToken\",\
879 \"variant\":\"Ident\",\
888 \"variant\":\"TtDelimited\",\
892 \"delim\":\"Paren\",\
896 \"variant\":\"TtToken\",\
900 \"variant\":\"Ident\",\
909 \"variant\":\"TtToken\",\
916 \"variant\":\"TtToken\",\
920 \"variant\":\"Ident\",\
934 \"variant\":\"TtDelimited\",\
938 \"delim\":\"Brace\",\
942 \"variant\":\"TtToken\",\
946 \"variant\":\"Ident\",\
955 \"variant\":\"TtToken\",\
970 #[test] fn ret_expr() {
971 assert!(string_to_expr("return d".to_string()) ==
973 id: ast::DUMMY_NODE_ID,
974 node:ast::ExprRet(Some(P(ast::Expr{
975 id: ast::DUMMY_NODE_ID,
976 node:ast::ExprPath(ast::Path{
981 identifier: str_to_ident("d"),
982 parameters: ast::PathParameters::none(),
992 #[test] fn parse_stmt_1 () {
993 assert!(string_to_stmt("b;".to_string()) ==
995 node: ast::StmtExpr(P(ast::Expr {
996 id: ast::DUMMY_NODE_ID,
997 node: ast::ExprPath(ast::Path {
1002 identifier: str_to_ident("b"),
1003 parameters: ast::PathParameters::none(),
1008 ast::DUMMY_NODE_ID),
1013 fn parser_done(p: Parser){
1014 assert_eq!(p.token.clone(), token::Eof);
1017 #[test] fn parse_ident_pat () {
1018 let sess = new_parse_sess();
1019 let mut parser = string_to_parser(&sess, "b".to_string());
1020 assert!(parser.parse_pat()
1022 id: ast::DUMMY_NODE_ID,
1023 node: ast::PatIdent(ast::BindByValue(ast::MutImmutable),
1024 Spanned{ span:sp(0, 1),
1025 node: str_to_ident("b")
1029 parser_done(parser);
1032 // check the contents of the tt manually:
1033 #[test] fn parse_fundecl () {
1034 // this test depends on the intern order of "fn" and "int"
1035 assert!(string_to_item("fn a (b : int) { b; }".to_string()) ==
1037 P(ast::Item{ident:str_to_ident("a"),
1039 id: ast::DUMMY_NODE_ID,
1040 node: ast::ItemFn(P(ast::FnDecl {
1041 inputs: vec!(ast::Arg{
1042 ty: P(ast::Ty{id: ast::DUMMY_NODE_ID,
1043 node: ast::TyPath(ast::Path{
1049 str_to_ident("int"),
1050 parameters: ast::PathParameters::none(),
1053 }, ast::DUMMY_NODE_ID),
1057 id: ast::DUMMY_NODE_ID,
1058 node: ast::PatIdent(
1059 ast::BindByValue(ast::MutImmutable),
1062 node: str_to_ident("b")},
1067 id: ast::DUMMY_NODE_ID
1069 output: ast::DefaultReturn(sp(15, 15)),
1072 ast::Unsafety::Normal,
1074 ast::Generics{ // no idea on either of these:
1075 lifetimes: Vec::new(),
1076 ty_params: OwnedSlice::empty(),
1077 where_clause: ast::WhereClause {
1078 id: ast::DUMMY_NODE_ID,
1079 predicates: Vec::new(),
1083 view_items: Vec::new(),
1084 stmts: vec!(P(Spanned{
1085 node: ast::StmtSemi(P(ast::Expr{
1086 id: ast::DUMMY_NODE_ID,
1087 node: ast::ExprPath(
1097 ast::PathParameters::none(),
1102 ast::DUMMY_NODE_ID),
1105 id: ast::DUMMY_NODE_ID,
1106 rules: ast::DefaultBlock, // no idea
1109 vis: ast::Inherited,
1113 #[test] fn parse_use() {
1114 let use_s = "use foo::bar::baz;";
1115 let vitem = string_to_view_item(use_s.to_string());
1116 let vitem_s = view_item_to_string(&vitem);
1117 assert_eq!(&vitem_s[], use_s);
1119 let use_s = "use foo::bar as baz;";
1120 let vitem = string_to_view_item(use_s.to_string());
1121 let vitem_s = view_item_to_string(&vitem);
1122 assert_eq!(&vitem_s[], use_s);
1125 #[test] fn parse_extern_crate() {
1126 let ex_s = "extern crate foo;";
1127 let vitem = string_to_view_item(ex_s.to_string());
1128 let vitem_s = view_item_to_string(&vitem);
1129 assert_eq!(&vitem_s[], ex_s);
1131 let ex_s = "extern crate \"foo\" as bar;";
1132 let vitem = string_to_view_item(ex_s.to_string());
1133 let vitem_s = view_item_to_string(&vitem);
1134 assert_eq!(&vitem_s[], ex_s);
1137 fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
1138 let item = string_to_item(src.to_string()).unwrap();
1140 struct PatIdentVisitor {
1143 impl<'v> ::visit::Visitor<'v> for PatIdentVisitor {
1144 fn visit_pat(&mut self, p: &'v ast::Pat) {
1146 ast::PatIdent(_ , ref spannedident, _) => {
1147 self.spans.push(spannedident.span.clone());
1150 ::visit::walk_pat(self, p);
1155 let mut v = PatIdentVisitor { spans: Vec::new() };
1156 ::visit::walk_item(&mut v, &*item);
1160 #[test] fn span_of_self_arg_pat_idents_are_correct() {
1162 let srcs = ["impl z { fn a (&self, &myarg: int) {} }",
1163 "impl z { fn a (&mut self, &myarg: int) {} }",
1164 "impl z { fn a (&'a self, &myarg: int) {} }",
1165 "impl z { fn a (self, &myarg: int) {} }",
1166 "impl z { fn a (self: Foo, &myarg: int) {} }",
1169 for &src in srcs.iter() {
1170 let spans = get_spans_of_pat_idents(src);
1171 let Span{ lo, hi, .. } = spans[0];
1172 assert!("self" == &src[lo.to_uint()..hi.to_uint()],
1173 "\"{}\" != \"self\". src=\"{}\"",
1174 &src[lo.to_uint()..hi.to_uint()], src)
1178 #[test] fn parse_exprs () {
1179 // just make sure that they parse....
1180 string_to_expr("3 + 4".to_string());
1181 string_to_expr("a::z.froob(b,&(987+3))".to_string());
1184 #[test] fn attrs_fix_bug () {
1185 string_to_item("pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
1186 -> Result<Box<Writer>, String> {
1189 (O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
1193 fn wb() -> c_int { O_WRONLY as c_int }
1195 let mut fflags: c_int = wb();
1199 #[test] fn crlf_doc_comments() {
1200 let sess = new_parse_sess();
1202 let name = "<source>".to_string();
1203 let source = "/// doc comment\r\nfn foo() {}".to_string();
1204 let item = parse_item_from_source_str(name.clone(), source, Vec::new(), &sess).unwrap();
1205 let doc = first_attr_value_str_by_name(item.attrs.as_slice(), "doc").unwrap();
1206 assert_eq!(doc.get(), "/// doc comment");
1208 let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
1209 let item = parse_item_from_source_str(name.clone(), source, Vec::new(), &sess).unwrap();
1210 let docs = item.attrs.iter().filter(|a| a.name().get() == "doc")
1211 .map(|a| a.value_str().unwrap().get().to_string()).collect::<Vec<_>>();
1212 let b: &[_] = &["/// doc comment".to_string(), "/// line 2".to_string()];
1213 assert_eq!(&docs[], b);
1215 let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
1216 let item = parse_item_from_source_str(name, source, Vec::new(), &sess).unwrap();
1217 let doc = first_attr_value_str_by_name(item.attrs.as_slice(), "doc").unwrap();
1218 assert_eq!(doc.get(), "/** doc comment\n * with CRLF */");