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};
27 #[cfg_attr(stage0, macro_escape)]
28 #[cfg_attr(not(stage0), macro_use)]
39 /// Info about a parsing session.
40 pub struct ParseSess {
41 pub span_diagnostic: SpanHandler, // better be the same as the one in the reader!
42 /// Used to determine and report recursive mod inclusions
43 included_mod_stack: RefCell<Vec<Path>>,
44 pub node_id: Cell<ast::NodeId>,
47 pub fn new_parse_sess() -> ParseSess {
49 span_diagnostic: mk_span_handler(default_handler(Auto, None), CodeMap::new()),
50 included_mod_stack: RefCell::new(Vec::new()),
51 node_id: Cell::new(1),
55 pub fn new_parse_sess_special_handler(sh: SpanHandler) -> ParseSess {
58 included_mod_stack: RefCell::new(Vec::new()),
59 node_id: Cell::new(1),
64 pub fn next_node_id(&self) -> ast::NodeId {
65 self.reserve_node_ids(1)
67 pub fn reserve_node_ids(&self, count: ast::NodeId) -> ast::NodeId {
68 let v = self.node_id.get();
70 match v.checked_add(count) {
71 Some(next) => { self.node_id.set(next); }
72 None => panic!("Input too large, ran out of node ids!")
79 // a bunch of utility functions of the form parse_<thing>_from_<source>
80 // where <thing> includes crate, expr, item, stmt, tts, and one that
81 // uses a HOF to parse anything, and <source> includes file and
84 pub fn parse_crate_from_file(
86 cfg: ast::CrateConfig,
89 new_parser_from_file(sess, cfg, input).parse_crate_mod()
90 // why is there no p.abort_if_errors here?
93 pub fn parse_crate_attrs_from_file(
95 cfg: ast::CrateConfig,
97 ) -> Vec<ast::Attribute> {
98 let mut parser = new_parser_from_file(sess, cfg, input);
99 let (inner, _) = parser.parse_inner_attrs_and_next();
103 pub fn parse_crate_from_source_str(name: String,
105 cfg: ast::CrateConfig,
108 let mut p = new_parser_from_source_str(sess,
112 maybe_aborted(p.parse_crate_mod(),p)
115 pub fn parse_crate_attrs_from_source_str(name: String,
117 cfg: ast::CrateConfig,
119 -> Vec<ast::Attribute> {
120 let mut p = new_parser_from_source_str(sess,
124 let (inner, _) = maybe_aborted(p.parse_inner_attrs_and_next(),p);
128 pub fn parse_expr_from_source_str(name: String,
130 cfg: ast::CrateConfig,
133 let mut p = new_parser_from_source_str(sess, cfg, name, source);
134 maybe_aborted(p.parse_expr(), p)
137 pub fn parse_item_from_source_str(name: String,
139 cfg: ast::CrateConfig,
141 -> Option<P<ast::Item>> {
142 let mut p = new_parser_from_source_str(sess, cfg, name, source);
143 maybe_aborted(p.parse_item_with_outer_attributes(),p)
146 pub fn parse_meta_from_source_str(name: String,
148 cfg: ast::CrateConfig,
150 -> P<ast::MetaItem> {
151 let mut p = new_parser_from_source_str(sess, cfg, name, source);
152 maybe_aborted(p.parse_meta_item(),p)
155 pub fn parse_stmt_from_source_str(name: String,
157 cfg: ast::CrateConfig,
158 attrs: Vec<ast::Attribute> ,
161 let mut p = new_parser_from_source_str(
167 maybe_aborted(p.parse_stmt(attrs),p)
170 // Note: keep in sync with `with_hygiene::parse_tts_from_source_str`
171 // until #16472 is resolved.
173 // Warning: This parses with quote_depth > 0, which is not the default.
174 pub fn parse_tts_from_source_str(name: String,
176 cfg: ast::CrateConfig,
178 -> Vec<ast::TokenTree> {
179 let mut p = new_parser_from_source_str(
186 // right now this is re-creating the token trees from ... token trees.
187 maybe_aborted(p.parse_all_token_trees(),p)
190 // Note: keep in sync with `with_hygiene::new_parser_from_source_str`
191 // until #16472 is resolved.
192 // Create a new parser from a source string
193 pub fn new_parser_from_source_str<'a>(sess: &'a ParseSess,
194 cfg: ast::CrateConfig,
198 filemap_to_parser(sess, string_to_filemap(sess, source, name), cfg)
201 /// Create a new parser, handling errors as appropriate
202 /// if the file doesn't exist
203 pub fn new_parser_from_file<'a>(sess: &'a ParseSess,
204 cfg: ast::CrateConfig,
205 path: &Path) -> Parser<'a> {
206 filemap_to_parser(sess, file_to_filemap(sess, path, None), cfg)
209 /// Given a session, a crate config, a path, and a span, add
210 /// the file at the given path to the codemap, and return a parser.
211 /// On an error, use the given span as the source of the problem.
212 pub fn new_sub_parser_from_file<'a>(sess: &'a ParseSess,
213 cfg: ast::CrateConfig,
215 owns_directory: bool,
216 module_name: Option<String>,
217 sp: Span) -> Parser<'a> {
218 let mut p = filemap_to_parser(sess, file_to_filemap(sess, path, Some(sp)), cfg);
219 p.owns_directory = owns_directory;
220 p.root_module_name = module_name;
224 // Note: keep this in sync with `with_hygiene::filemap_to_parser` until
225 // #16472 is resolved.
226 /// Given a filemap and config, return a parser
227 pub fn filemap_to_parser<'a>(sess: &'a ParseSess,
228 filemap: Rc<FileMap>,
229 cfg: ast::CrateConfig) -> Parser<'a> {
230 tts_to_parser(sess, filemap_to_tts(sess, filemap), cfg)
233 // must preserve old name for now, because quote! from the *existing*
234 // compiler expands into it
235 pub fn new_parser_from_tts<'a>(sess: &'a ParseSess,
236 cfg: ast::CrateConfig,
237 tts: Vec<ast::TokenTree>) -> Parser<'a> {
238 tts_to_parser(sess, tts, cfg)
244 /// Given a session and a path and an optional span (for error reporting),
245 /// add the path to the session's codemap and return the new filemap.
246 pub fn file_to_filemap(sess: &ParseSess, path: &Path, spanopt: Option<Span>)
248 let err = |&: msg: &str| {
250 Some(sp) => sess.span_diagnostic.span_fatal(sp, msg),
251 None => sess.span_diagnostic.handler().fatal(msg),
254 let bytes = match File::open(path).read_to_end() {
257 err(format!("couldn't read {}: {}",
263 match str::from_utf8(bytes[]).ok() {
265 return string_to_filemap(sess, s.to_string(),
266 path.as_str().unwrap().to_string())
269 err(format!("{} is not UTF-8 encoded", path.display())[])
275 /// Given a session and a string, add the string to
276 /// the session's codemap and return the new filemap
277 pub fn string_to_filemap(sess: &ParseSess, source: String, path: String)
279 sess.span_diagnostic.cm.new_filemap(path, source)
282 // Note: keep this in sync with `with_hygiene::filemap_to_tts` (apart
283 // from the StringReader constructor), until #16472 is resolved.
284 /// Given a filemap, produce a sequence of token-trees
285 pub fn filemap_to_tts(sess: &ParseSess, filemap: Rc<FileMap>)
286 -> Vec<ast::TokenTree> {
287 // it appears to me that the cfg doesn't matter here... indeed,
288 // parsing tt's probably shouldn't require a parser at all.
289 let cfg = Vec::new();
290 let srdr = lexer::StringReader::new(&sess.span_diagnostic, filemap);
291 let mut p1 = Parser::new(sess, cfg, box srdr);
292 p1.parse_all_token_trees()
295 /// Given tts and cfg, produce a parser
296 pub fn tts_to_parser<'a>(sess: &'a ParseSess,
297 tts: Vec<ast::TokenTree>,
298 cfg: ast::CrateConfig) -> Parser<'a> {
299 let trdr = lexer::new_tt_reader(&sess.span_diagnostic, None, None, tts);
300 Parser::new(sess, cfg, box trdr)
303 // FIXME (Issue #16472): The `with_hygiene` mod should go away after
304 // ToToken impls are revised to go directly to token-trees.
305 pub mod with_hygiene {
307 use codemap::FileMap;
308 use parse::parser::Parser;
310 use super::ParseSess;
311 use super::{maybe_aborted, string_to_filemap, tts_to_parser};
313 // Note: keep this in sync with `super::parse_tts_from_source_str` until
314 // #16472 is resolved.
316 // Warning: This parses with quote_depth > 0, which is not the default.
317 pub fn parse_tts_from_source_str(name: String,
319 cfg: ast::CrateConfig,
320 sess: &ParseSess) -> Vec<ast::TokenTree> {
321 let mut p = new_parser_from_source_str(
328 // right now this is re-creating the token trees from ... token trees.
329 maybe_aborted(p.parse_all_token_trees(),p)
332 // Note: keep this in sync with `super::new_parser_from_source_str` until
333 // #16472 is resolved.
334 // Create a new parser from a source string
335 fn new_parser_from_source_str<'a>(sess: &'a ParseSess,
336 cfg: ast::CrateConfig,
338 source: String) -> Parser<'a> {
339 filemap_to_parser(sess, string_to_filemap(sess, source, name), cfg)
342 // Note: keep this in sync with `super::filemap_to_parserr` until
343 // #16472 is resolved.
344 /// Given a filemap and config, return a parser
345 fn filemap_to_parser<'a>(sess: &'a ParseSess,
346 filemap: Rc<FileMap>,
347 cfg: ast::CrateConfig) -> Parser<'a> {
348 tts_to_parser(sess, filemap_to_tts(sess, filemap), cfg)
351 // Note: keep this in sync with `super::filemap_to_tts` until
352 // #16472 is resolved.
353 /// Given a filemap, produce a sequence of token-trees
354 fn filemap_to_tts(sess: &ParseSess, filemap: Rc<FileMap>)
355 -> Vec<ast::TokenTree> {
356 // it appears to me that the cfg doesn't matter here... indeed,
357 // parsing tt's probably shouldn't require a parser at all.
358 use super::lexer::make_reader_with_embedded_idents as make_reader;
359 let cfg = Vec::new();
360 let srdr = make_reader(&sess.span_diagnostic, filemap);
361 let mut p1 = Parser::new(sess, cfg, box srdr);
362 p1.parse_all_token_trees()
366 /// Abort if necessary
367 pub fn maybe_aborted<T>(result: T, mut p: Parser) -> T {
372 /// Parse a string representing a character literal into its final form.
373 /// Rather than just accepting/rejecting a given literal, unescapes it as
374 /// well. Can take any slice prefixed by a character escape. Returns the
375 /// character and the number of characters consumed.
376 pub fn char_lit(lit: &str) -> (char, int) {
377 use std::{num, char};
379 let mut chars = lit.chars();
380 let c = match (chars.next(), chars.next()) {
381 (Some(c), None) if c != '\\' => return (c, 1),
382 (Some('\\'), Some(c)) => match c {
392 _ => panic!("lexer accepted invalid char escape `{}`", lit)
396 Some(x) => return (x, 2),
400 let msg = format!("lexer should have rejected a bad character escape {}", lit);
403 fn esc(len: uint, lit: &str) -> Option<(char, int)> {
404 num::from_str_radix(lit[2..len], 16)
405 .and_then(char::from_u32)
406 .map(|x| (x, len as int))
409 let unicode_escape = |&: | -> Option<(char, int)>
410 if lit.as_bytes()[2] == b'{' {
411 let idx = lit.find('}').expect(msg2);
412 let subslice = lit[3..idx];
413 num::from_str_radix(subslice, 16)
414 .and_then(char::from_u32)
415 .map(|x| (x, subslice.chars().count() as int + 4))
421 return match lit.as_bytes()[1] as char {
422 'x' | 'X' => esc(4, lit),
423 'u' => unicode_escape(),
429 /// Parse a string representing a string literal into its final form. Does
431 pub fn str_lit(lit: &str) -> String {
432 debug!("parse_str_lit: given {}", lit.escape_default());
433 let mut res = String::with_capacity(lit.len());
435 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
436 let error = |&: i| format!("lexer should have rejected {} at {}", lit, i);
438 /// Eat everything up to a non-whitespace
439 fn eat<'a>(it: &mut iter::Peekable<(uint, char), str::CharIndices<'a>>) {
441 match it.peek().map(|x| x.1) {
442 Some(' ') | Some('\n') | Some('\r') | Some('\t') => {
450 let mut chars = lit.char_indices().peekable();
456 let ch = chars.peek().unwrap_or_else(|| {
457 panic!("{}", error(i).as_slice())
462 } else if ch == '\r' {
464 let ch = chars.peek().unwrap_or_else(|| {
465 panic!("{}", error(i).as_slice())
469 panic!("lexer accepted bare CR");
473 // otherwise, a normal escape
474 let (c, n) = char_lit(lit[i..]);
475 for _ in range(0, n - 1) { // we don't need to move past the first \
482 let ch = chars.peek().unwrap_or_else(|| {
483 panic!("{}", error(i).as_slice())
487 panic!("lexer accepted bare CR");
499 res.shrink_to_fit(); // probably not going to do anything, unless there was an escape.
500 debug!("parse_str_lit: returning {}", res);
504 /// Parse a string representing a raw string literal into its final form. The
505 /// only operation this does is convert embedded CRLF into a single LF.
506 pub fn raw_str_lit(lit: &str) -> String {
507 debug!("raw_str_lit: given {}", lit.escape_default());
508 let mut res = String::with_capacity(lit.len());
510 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
511 let mut chars = lit.chars().peekable();
516 if *chars.peek().unwrap() != '\n' {
517 panic!("lexer accepted bare CR");
533 // check if `s` looks like i32 or u1234 etc.
534 fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
536 first_chars.contains(&s.char_at(0)) &&
537 s[1..].chars().all(|c| '0' <= c && c <= '9')
540 fn filtered_float_lit(data: token::InternedString, suffix: Option<&str>,
541 sd: &SpanHandler, sp: Span) -> ast::Lit_ {
542 debug!("filtered_float_lit: {}, {}", data, suffix);
544 Some("f32") => ast::LitFloat(data, ast::TyF32),
545 Some("f64") => ast::LitFloat(data, ast::TyF64),
547 if suf.len() >= 2 && looks_like_width_suffix(&['f'], suf) {
548 // if it looks like a width, lets try to be helpful.
549 sd.span_err(sp, &*format!("illegal width `{}` for float literal, \
550 valid widths are 32 and 64", suf[1..]));
552 sd.span_err(sp, &*format!("illegal suffix `{}` for float literal, \
553 valid suffixes are `f32` and `f64`", suf));
556 ast::LitFloatUnsuffixed(data)
558 None => ast::LitFloatUnsuffixed(data)
561 pub fn float_lit(s: &str, suffix: Option<&str>, sd: &SpanHandler, sp: Span) -> ast::Lit_ {
562 debug!("float_lit: {}, {}", s, suffix);
563 // FIXME #2252: bounds checking float literals is defered until trans
564 let s = s.chars().filter(|&c| c != '_').collect::<String>();
565 let data = token::intern_and_get_ident(&*s);
566 filtered_float_lit(data, suffix, sd, sp)
569 /// Parse a string representing a byte literal into its final form. Similar to `char_lit`
570 pub fn byte_lit(lit: &str) -> (u8, uint) {
571 let err = |&: i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
574 (lit.as_bytes()[0], 1)
576 assert!(lit.as_bytes()[0] == b'\\', err(0i));
577 let b = match lit.as_bytes()[1] {
586 match ::std::num::from_str_radix::<u64>(lit[2..4], 16) {
593 None => panic!(err(3))
601 pub fn binary_lit(lit: &str) -> Rc<Vec<u8>> {
602 let mut res = Vec::with_capacity(lit.len());
604 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
605 let error = |&: i| format!("lexer should have rejected {} at {}", lit, i);
607 /// Eat everything up to a non-whitespace
608 fn eat<'a, I: Iterator<Item=(uint, u8)>>(it: &mut iter::Peekable<(uint, u8), I>) {
610 match it.peek().map(|x| x.1) {
611 Some(b' ') | Some(b'\n') | Some(b'\r') | Some(b'\t') => {
619 // binary literals *must* be ASCII, but the escapes don't have to be
620 let mut chars = lit.bytes().enumerate().peekable();
623 Some((i, b'\\')) => {
625 match chars.peek().expect(em.as_slice()).1 {
626 b'\n' => eat(&mut chars),
629 if chars.peek().expect(em.as_slice()).1 != b'\n' {
630 panic!("lexer accepted bare CR");
635 // otherwise, a normal escape
636 let (c, n) = byte_lit(lit[i..]);
637 // we don't need to move past the first \
638 for _ in range(0, n - 1) {
645 Some((i, b'\r')) => {
647 if chars.peek().expect(em.as_slice()).1 != b'\n' {
648 panic!("lexer accepted bare CR");
653 Some((_, c)) => res.push(c),
661 pub fn integer_lit(s: &str, suffix: Option<&str>, sd: &SpanHandler, sp: Span) -> ast::Lit_ {
662 // s can only be ascii, byte indexing is fine
664 let s2 = s.chars().filter(|&c| c != '_').collect::<String>();
667 debug!("integer_lit: {}, {}", s, suffix);
671 let mut ty = ast::UnsuffixedIntLit(ast::Plus);
673 if s.char_at(0) == '0' && s.len() > 1 {
682 // 1f64 and 2f32 etc. are valid float literals.
684 Some(suf) if looks_like_width_suffix(&['f'], suf) => {
686 16u => sd.span_err(sp, "hexadecimal float literal is not supported"),
687 8u => sd.span_err(sp, "octal float literal is not supported"),
688 2u => sd.span_err(sp, "binary float literal is not supported"),
691 let ident = token::intern_and_get_ident(&*s);
692 return filtered_float_lit(ident, suffix, sd, sp)
701 if let Some(suf) = suffix {
702 if suf.is_empty() { sd.span_bug(sp, "found empty literal suffix in Some")}
704 "i" => ast::SignedIntLit(ast::TyI, ast::Plus),
705 "i8" => ast::SignedIntLit(ast::TyI8, ast::Plus),
706 "i16" => ast::SignedIntLit(ast::TyI16, ast::Plus),
707 "i32" => ast::SignedIntLit(ast::TyI32, ast::Plus),
708 "i64" => ast::SignedIntLit(ast::TyI64, ast::Plus),
709 "u" => ast::UnsignedIntLit(ast::TyU),
710 "u8" => ast::UnsignedIntLit(ast::TyU8),
711 "u16" => ast::UnsignedIntLit(ast::TyU16),
712 "u32" => ast::UnsignedIntLit(ast::TyU32),
713 "u64" => ast::UnsignedIntLit(ast::TyU64),
715 // i<digits> and u<digits> look like widths, so lets
716 // give an error message along those lines
717 if looks_like_width_suffix(&['i', 'u'], suf) {
718 sd.span_err(sp, &*format!("illegal width `{}` for integer literal; \
719 valid widths are 8, 16, 32 and 64",
722 sd.span_err(sp, &*format!("illegal suffix `{}` for numeric literal", suf));
730 debug!("integer_lit: the type is {}, base {}, the new string is {}, the original \
731 string was {}, the original suffix was {}", ty, base, s, orig, suffix);
733 let res: u64 = match ::std::num::from_str_radix(s, base) {
735 None => { sd.span_err(sp, "int literal is too large"); 0 }
739 let sign = ast::Sign::new(res);
741 ast::SignedIntLit(t, _) => ast::LitInt(res, ast::SignedIntLit(t, sign)),
742 ast::UnsuffixedIntLit(_) => ast::LitInt(res, ast::UnsuffixedIntLit(sign)),
743 us@ast::UnsignedIntLit(_) => ast::LitInt(res, us)
751 use codemap::{Span, BytePos, Pos, Spanned, NO_EXPANSION};
752 use owned_slice::OwnedSlice;
755 use attr::{first_attr_value_str_by_name, AttrMetaMethods};
756 use parse::parser::Parser;
757 use parse::token::{str_to_ident};
758 use print::pprust::view_item_to_string;
760 use util::parser_testing::{string_to_tts, string_to_parser};
761 use util::parser_testing::{string_to_expr, string_to_item};
762 use util::parser_testing::{string_to_stmt, string_to_view_item};
764 // produce a codemap::span
765 fn sp(a: u32, b: u32) -> Span {
766 Span {lo: BytePos(a), hi: BytePos(b), expn_id: NO_EXPANSION}
769 #[test] fn path_exprs_1() {
770 assert!(string_to_expr("a".to_string()) ==
772 id: ast::DUMMY_NODE_ID,
773 node: ast::ExprPath(ast::Path {
778 identifier: str_to_ident("a"),
779 parameters: ast::PathParameters::none(),
787 #[test] fn path_exprs_2 () {
788 assert!(string_to_expr("::a::b".to_string()) ==
790 id: ast::DUMMY_NODE_ID,
791 node: ast::ExprPath(ast::Path {
796 identifier: str_to_ident("a"),
797 parameters: ast::PathParameters::none(),
800 identifier: str_to_ident("b"),
801 parameters: ast::PathParameters::none(),
810 #[test] fn bad_path_expr_1() {
811 string_to_expr("::abc::def::return".to_string());
814 // check the token-tree-ization of macros
816 fn string_to_tts_macro () {
817 let tts = string_to_tts("macro_rules! zip (($a)=>($a))".to_string());
818 let tts: &[ast::TokenTree] = tts[];
820 [ast::TtToken(_, token::Ident(name_macro_rules, token::Plain)),
821 ast::TtToken(_, token::Not),
822 ast::TtToken(_, token::Ident(name_zip, token::Plain)),
823 ast::TtDelimited(_, ref macro_delimed)]
824 if name_macro_rules.as_str() == "macro_rules"
825 && name_zip.as_str() == "zip" => {
826 match macro_delimed.tts[] {
827 [ast::TtDelimited(_, ref first_delimed),
828 ast::TtToken(_, token::FatArrow),
829 ast::TtDelimited(_, ref second_delimed)]
830 if macro_delimed.delim == token::Paren => {
831 match first_delimed.tts[] {
832 [ast::TtToken(_, token::Dollar),
833 ast::TtToken(_, token::Ident(name, token::Plain))]
834 if first_delimed.delim == token::Paren
835 && name.as_str() == "a" => {},
836 _ => panic!("value 3: {}", **first_delimed),
838 match second_delimed.tts[] {
839 [ast::TtToken(_, token::Dollar),
840 ast::TtToken(_, token::Ident(name, token::Plain))]
841 if second_delimed.delim == token::Paren
842 && name.as_str() == "a" => {},
843 _ => panic!("value 4: {}", **second_delimed),
846 _ => panic!("value 2: {}", **macro_delimed),
849 _ => panic!("value: {}",tts),
854 fn string_to_tts_1 () {
855 let tts = string_to_tts("fn a (b : int) { b; }".to_string());
856 assert_eq!(json::encode(&tts),
859 \"variant\":\"TtToken\",\
863 \"variant\":\"Ident\",\
872 \"variant\":\"TtToken\",\
876 \"variant\":\"Ident\",\
885 \"variant\":\"TtDelimited\",\
889 \"delim\":\"Paren\",\
893 \"variant\":\"TtToken\",\
897 \"variant\":\"Ident\",\
906 \"variant\":\"TtToken\",\
913 \"variant\":\"TtToken\",\
917 \"variant\":\"Ident\",\
931 \"variant\":\"TtDelimited\",\
935 \"delim\":\"Brace\",\
939 \"variant\":\"TtToken\",\
943 \"variant\":\"Ident\",\
952 \"variant\":\"TtToken\",\
967 #[test] fn ret_expr() {
968 assert!(string_to_expr("return d".to_string()) ==
970 id: ast::DUMMY_NODE_ID,
971 node:ast::ExprRet(Some(P(ast::Expr{
972 id: ast::DUMMY_NODE_ID,
973 node:ast::ExprPath(ast::Path{
978 identifier: str_to_ident("d"),
979 parameters: ast::PathParameters::none(),
989 #[test] fn parse_stmt_1 () {
990 assert!(string_to_stmt("b;".to_string()) ==
992 node: ast::StmtExpr(P(ast::Expr {
993 id: ast::DUMMY_NODE_ID,
994 node: ast::ExprPath(ast::Path {
999 identifier: str_to_ident("b"),
1000 parameters: ast::PathParameters::none(),
1005 ast::DUMMY_NODE_ID),
1010 fn parser_done(p: Parser){
1011 assert_eq!(p.token.clone(), token::Eof);
1014 #[test] fn parse_ident_pat () {
1015 let sess = new_parse_sess();
1016 let mut parser = string_to_parser(&sess, "b".to_string());
1017 assert!(parser.parse_pat()
1019 id: ast::DUMMY_NODE_ID,
1020 node: ast::PatIdent(ast::BindByValue(ast::MutImmutable),
1021 Spanned{ span:sp(0, 1),
1022 node: str_to_ident("b")
1026 parser_done(parser);
1029 // check the contents of the tt manually:
1030 #[test] fn parse_fundecl () {
1031 // this test depends on the intern order of "fn" and "int"
1032 assert!(string_to_item("fn a (b : int) { b; }".to_string()) ==
1034 P(ast::Item{ident:str_to_ident("a"),
1036 id: ast::DUMMY_NODE_ID,
1037 node: ast::ItemFn(P(ast::FnDecl {
1038 inputs: vec!(ast::Arg{
1039 ty: P(ast::Ty{id: ast::DUMMY_NODE_ID,
1040 node: ast::TyPath(ast::Path{
1046 str_to_ident("int"),
1047 parameters: ast::PathParameters::none(),
1050 }, ast::DUMMY_NODE_ID),
1054 id: ast::DUMMY_NODE_ID,
1055 node: ast::PatIdent(
1056 ast::BindByValue(ast::MutImmutable),
1059 node: str_to_ident("b")},
1064 id: ast::DUMMY_NODE_ID
1066 output: ast::Return(P(ast::Ty{id: ast::DUMMY_NODE_ID,
1067 node: ast::TyTup(vec![]),
1068 span:sp(15,15)})), // not sure
1071 ast::Unsafety::Normal,
1073 ast::Generics{ // no idea on either of these:
1074 lifetimes: Vec::new(),
1075 ty_params: OwnedSlice::empty(),
1076 where_clause: ast::WhereClause {
1077 id: ast::DUMMY_NODE_ID,
1078 predicates: Vec::new(),
1082 view_items: Vec::new(),
1083 stmts: vec!(P(Spanned{
1084 node: ast::StmtSemi(P(ast::Expr{
1085 id: ast::DUMMY_NODE_ID,
1086 node: ast::ExprPath(
1096 ast::PathParameters::none(),
1101 ast::DUMMY_NODE_ID),
1104 id: ast::DUMMY_NODE_ID,
1105 rules: ast::DefaultBlock, // no idea
1108 vis: ast::Inherited,
1112 #[test] fn parse_use() {
1113 let use_s = "use foo::bar::baz;";
1114 let vitem = string_to_view_item(use_s.to_string());
1115 let vitem_s = view_item_to_string(&vitem);
1116 assert_eq!(vitem_s[], use_s);
1118 let use_s = "use foo::bar as baz;";
1119 let vitem = string_to_view_item(use_s.to_string());
1120 let vitem_s = view_item_to_string(&vitem);
1121 assert_eq!(vitem_s[], use_s);
1124 #[test] fn parse_extern_crate() {
1125 let ex_s = "extern crate foo;";
1126 let vitem = string_to_view_item(ex_s.to_string());
1127 let vitem_s = view_item_to_string(&vitem);
1128 assert_eq!(vitem_s[], ex_s);
1130 let ex_s = "extern crate \"foo\" as bar;";
1131 let vitem = string_to_view_item(ex_s.to_string());
1132 let vitem_s = view_item_to_string(&vitem);
1133 assert_eq!(vitem_s[], ex_s);
1136 fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
1137 let item = string_to_item(src.to_string()).unwrap();
1139 struct PatIdentVisitor {
1142 impl<'v> ::visit::Visitor<'v> for PatIdentVisitor {
1143 fn visit_pat(&mut self, p: &'v ast::Pat) {
1145 ast::PatIdent(_ , ref spannedident, _) => {
1146 self.spans.push(spannedident.span.clone());
1149 ::visit::walk_pat(self, p);
1154 let mut v = PatIdentVisitor { spans: Vec::new() };
1155 ::visit::walk_item(&mut v, &*item);
1159 #[test] fn span_of_self_arg_pat_idents_are_correct() {
1161 let srcs = ["impl z { fn a (&self, &myarg: int) {} }",
1162 "impl z { fn a (&mut self, &myarg: int) {} }",
1163 "impl z { fn a (&'a self, &myarg: int) {} }",
1164 "impl z { fn a (self, &myarg: int) {} }",
1165 "impl z { fn a (self: Foo, &myarg: int) {} }",
1168 for &src in srcs.iter() {
1169 let spans = get_spans_of_pat_idents(src);
1170 let Span{lo:lo,hi:hi,..} = spans[0];
1171 assert!("self" == src[lo.to_uint()..hi.to_uint()],
1172 "\"{}\" != \"self\". src=\"{}\"",
1173 src[lo.to_uint()..hi.to_uint()], src)
1177 #[test] fn parse_exprs () {
1178 // just make sure that they parse....
1179 string_to_expr("3 + 4".to_string());
1180 string_to_expr("a::z.froob(b,&(987+3))".to_string());
1183 #[test] fn attrs_fix_bug () {
1184 string_to_item("pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
1185 -> Result<Box<Writer>, String> {
1188 (O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
1192 fn wb() -> c_int { O_WRONLY as c_int }
1194 let mut fflags: c_int = wb();
1198 #[test] fn crlf_doc_comments() {
1199 let sess = new_parse_sess();
1201 let name = "<source>".to_string();
1202 let source = "/// doc comment\r\nfn foo() {}".to_string();
1203 let item = parse_item_from_source_str(name.clone(), source, Vec::new(), &sess).unwrap();
1204 let doc = first_attr_value_str_by_name(item.attrs.as_slice(), "doc").unwrap();
1205 assert_eq!(doc.get(), "/// doc comment");
1207 let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
1208 let item = parse_item_from_source_str(name.clone(), source, Vec::new(), &sess).unwrap();
1209 let docs = item.attrs.iter().filter(|a| a.name().get() == "doc")
1210 .map(|a| a.value_str().unwrap().get().to_string()).collect::<Vec<_>>();
1211 let b: &[_] = &["/// doc comment".to_string(), "/// line 2".to_string()];
1212 assert_eq!(docs[], b);
1214 let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
1215 let item = parse_item_from_source_str(name, source, Vec::new(), &sess).unwrap();
1216 let doc = first_attr_value_str_by_name(item.attrs.as_slice(), "doc").unwrap();
1217 assert_eq!(doc.get(), "/** doc comment\n * with CRLF */");