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(
184 p.quote_depth += 1us;
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 {:?}: {}",
257 path.display(), e)[]);
261 match str::from_utf8(&bytes[]).ok() {
263 return string_to_filemap(sess, s.to_string(),
264 path.as_str().unwrap().to_string())
267 err(&format!("{:?} is not UTF-8 encoded", path.display())[])
273 /// Given a session and a string, add the string to
274 /// the session's codemap and return the new filemap
275 pub fn string_to_filemap(sess: &ParseSess, source: String, path: String)
277 sess.span_diagnostic.cm.new_filemap(path, source)
280 // Note: keep this in sync with `with_hygiene::filemap_to_tts` (apart
281 // from the StringReader constructor), until #16472 is resolved.
282 /// Given a filemap, produce a sequence of token-trees
283 pub fn filemap_to_tts(sess: &ParseSess, filemap: Rc<FileMap>)
284 -> Vec<ast::TokenTree> {
285 // it appears to me that the cfg doesn't matter here... indeed,
286 // parsing tt's probably shouldn't require a parser at all.
287 let cfg = Vec::new();
288 let srdr = lexer::StringReader::new(&sess.span_diagnostic, filemap);
289 let mut p1 = Parser::new(sess, cfg, box srdr);
290 p1.parse_all_token_trees()
293 /// Given tts and cfg, produce a parser
294 pub fn tts_to_parser<'a>(sess: &'a ParseSess,
295 tts: Vec<ast::TokenTree>,
296 cfg: ast::CrateConfig) -> Parser<'a> {
297 let trdr = lexer::new_tt_reader(&sess.span_diagnostic, None, None, tts);
298 let mut p = Parser::new(sess, cfg, box trdr);
299 p.check_unknown_macro_variable();
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(
327 p.quote_depth += 1us;
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, 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, isize) {
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: usize, lit: &str) -> Option<(char, isize)> {
404 num::from_str_radix(&lit[2..len], 16)
405 .and_then(char::from_u32)
406 .map(|x| (x, len as isize))
409 let unicode_escape = |&: | -> Option<(char, isize)>
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 isize + 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<(usize, 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, usize) {
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(0is));
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=(usize, u8)>>(it: &mut iter::Peekable<(usize, 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 16us => sd.span_err(sp, "hexadecimal float literal is not supported"),
687 8us => sd.span_err(sp, "octal float literal is not supported"),
688 2us => 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::TyIs(true), ast::Plus),
705 "is" => ast::SignedIntLit(ast::TyIs(false), ast::Plus),
706 "i8" => ast::SignedIntLit(ast::TyI8, ast::Plus),
707 "i16" => ast::SignedIntLit(ast::TyI16, ast::Plus),
708 "i32" => ast::SignedIntLit(ast::TyI32, ast::Plus),
709 "i64" => ast::SignedIntLit(ast::TyI64, ast::Plus),
710 "u" => ast::UnsignedIntLit(ast::TyUs(true)),
711 "us" => ast::UnsignedIntLit(ast::TyUs(false)),
712 "u8" => ast::UnsignedIntLit(ast::TyU8),
713 "u16" => ast::UnsignedIntLit(ast::TyU16),
714 "u32" => ast::UnsignedIntLit(ast::TyU32),
715 "u64" => ast::UnsignedIntLit(ast::TyU64),
717 // i<digits> and u<digits> look like widths, so lets
718 // give an error message along those lines
719 if looks_like_width_suffix(&['i', 'u'], suf) {
720 sd.span_err(sp, &*format!("illegal width `{}` for integer literal; \
721 valid widths are 8, 16, 32 and 64",
724 sd.span_err(sp, &*format!("illegal suffix `{}` for numeric literal", suf));
732 debug!("integer_lit: the type is {:?}, base {:?}, the new string is {:?}, the original \
733 string was {:?}, the original suffix was {:?}", ty, base, s, orig, suffix);
735 let res: u64 = match ::std::num::from_str_radix(s, base) {
737 None => { sd.span_err(sp, "int literal is too large"); 0 }
741 let sign = ast::Sign::new(res);
743 ast::SignedIntLit(t, _) => ast::LitInt(res, ast::SignedIntLit(t, sign)),
744 ast::UnsuffixedIntLit(_) => ast::LitInt(res, ast::UnsuffixedIntLit(sign)),
745 us@ast::UnsignedIntLit(_) => ast::LitInt(res, us)
753 use codemap::{Span, BytePos, Pos, Spanned, NO_EXPANSION};
754 use owned_slice::OwnedSlice;
757 use attr::{first_attr_value_str_by_name, AttrMetaMethods};
758 use parse::parser::Parser;
759 use parse::token::{str_to_ident};
760 use print::pprust::view_item_to_string;
762 use util::parser_testing::{string_to_tts, string_to_parser};
763 use util::parser_testing::{string_to_expr, string_to_item};
764 use util::parser_testing::{string_to_stmt, string_to_view_item};
766 // produce a codemap::span
767 fn sp(a: u32, b: u32) -> Span {
768 Span {lo: BytePos(a), hi: BytePos(b), expn_id: NO_EXPANSION}
771 #[test] fn path_exprs_1() {
772 assert!(string_to_expr("a".to_string()) ==
774 id: ast::DUMMY_NODE_ID,
775 node: ast::ExprPath(ast::Path {
780 identifier: str_to_ident("a"),
781 parameters: ast::PathParameters::none(),
789 #[test] fn path_exprs_2 () {
790 assert!(string_to_expr("::a::b".to_string()) ==
792 id: ast::DUMMY_NODE_ID,
793 node: ast::ExprPath(ast::Path {
798 identifier: str_to_ident("a"),
799 parameters: ast::PathParameters::none(),
802 identifier: str_to_ident("b"),
803 parameters: ast::PathParameters::none(),
812 #[test] fn bad_path_expr_1() {
813 string_to_expr("::abc::def::return".to_string());
816 // check the token-tree-ization of macros
818 fn string_to_tts_macro () {
819 let tts = string_to_tts("macro_rules! zip (($a)=>($a))".to_string());
820 let tts: &[ast::TokenTree] = &tts[];
822 [ast::TtToken(_, token::Ident(name_macro_rules, token::Plain)),
823 ast::TtToken(_, token::Not),
824 ast::TtToken(_, token::Ident(name_zip, token::Plain)),
825 ast::TtDelimited(_, ref macro_delimed)]
826 if name_macro_rules.as_str() == "macro_rules"
827 && name_zip.as_str() == "zip" => {
828 match ¯o_delimed.tts[] {
829 [ast::TtDelimited(_, ref first_delimed),
830 ast::TtToken(_, token::FatArrow),
831 ast::TtDelimited(_, ref second_delimed)]
832 if macro_delimed.delim == token::Paren => {
833 match &first_delimed.tts[] {
834 [ast::TtToken(_, token::Dollar),
835 ast::TtToken(_, token::Ident(name, token::Plain))]
836 if first_delimed.delim == token::Paren
837 && name.as_str() == "a" => {},
838 _ => panic!("value 3: {:?}", **first_delimed),
840 match &second_delimed.tts[] {
841 [ast::TtToken(_, token::Dollar),
842 ast::TtToken(_, token::Ident(name, token::Plain))]
843 if second_delimed.delim == token::Paren
844 && name.as_str() == "a" => {},
845 _ => panic!("value 4: {:?}", **second_delimed),
848 _ => panic!("value 2: {:?}", **macro_delimed),
851 _ => panic!("value: {:?}",tts),
856 fn string_to_tts_1 () {
857 let tts = string_to_tts("fn a (b : i32) { b; }".to_string());
858 assert_eq!(json::encode(&tts),
861 \"variant\":\"TtToken\",\
865 \"variant\":\"Ident\",\
874 \"variant\":\"TtToken\",\
878 \"variant\":\"Ident\",\
887 \"variant\":\"TtDelimited\",\
891 \"delim\":\"Paren\",\
895 \"variant\":\"TtToken\",\
899 \"variant\":\"Ident\",\
908 \"variant\":\"TtToken\",\
915 \"variant\":\"TtToken\",\
919 \"variant\":\"Ident\",\
933 \"variant\":\"TtDelimited\",\
937 \"delim\":\"Brace\",\
941 \"variant\":\"TtToken\",\
945 \"variant\":\"Ident\",\
954 \"variant\":\"TtToken\",\
969 #[test] fn ret_expr() {
970 assert!(string_to_expr("return d".to_string()) ==
972 id: ast::DUMMY_NODE_ID,
973 node:ast::ExprRet(Some(P(ast::Expr{
974 id: ast::DUMMY_NODE_ID,
975 node:ast::ExprPath(ast::Path{
980 identifier: str_to_ident("d"),
981 parameters: ast::PathParameters::none(),
991 #[test] fn parse_stmt_1 () {
992 assert!(string_to_stmt("b;".to_string()) ==
994 node: ast::StmtExpr(P(ast::Expr {
995 id: ast::DUMMY_NODE_ID,
996 node: ast::ExprPath(ast::Path {
1001 identifier: str_to_ident("b"),
1002 parameters: ast::PathParameters::none(),
1007 ast::DUMMY_NODE_ID),
1012 fn parser_done(p: Parser){
1013 assert_eq!(p.token.clone(), token::Eof);
1016 #[test] fn parse_ident_pat () {
1017 let sess = new_parse_sess();
1018 let mut parser = string_to_parser(&sess, "b".to_string());
1019 assert!(parser.parse_pat()
1021 id: ast::DUMMY_NODE_ID,
1022 node: ast::PatIdent(ast::BindByValue(ast::MutImmutable),
1023 Spanned{ span:sp(0, 1),
1024 node: str_to_ident("b")
1028 parser_done(parser);
1031 // check the contents of the tt manually:
1032 #[test] fn parse_fundecl () {
1033 // this test depends on the intern order of "fn" and "i32"
1034 assert_eq!(string_to_item("fn a (b : i32) { b; }".to_string()),
1036 P(ast::Item{ident:str_to_ident("a"),
1038 id: ast::DUMMY_NODE_ID,
1039 node: ast::ItemFn(P(ast::FnDecl {
1040 inputs: vec!(ast::Arg{
1041 ty: P(ast::Ty{id: ast::DUMMY_NODE_ID,
1042 node: ast::TyPath(ast::Path{
1048 str_to_ident("i32"),
1049 parameters: ast::PathParameters::none(),
1052 }, ast::DUMMY_NODE_ID),
1056 id: ast::DUMMY_NODE_ID,
1057 node: ast::PatIdent(
1058 ast::BindByValue(ast::MutImmutable),
1061 node: str_to_ident("b")},
1066 id: ast::DUMMY_NODE_ID
1068 output: ast::DefaultReturn(sp(15, 15)),
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: i32) {} }",
1162 "impl z { fn a (&mut self, &myarg: i32) {} }",
1163 "impl z { fn a (&'a self, &myarg: i32) {} }",
1164 "impl z { fn a (self, &myarg: i32) {} }",
1165 "impl z { fn a (self: Foo, &myarg: i32) {} }",
1168 for &src in srcs.iter() {
1169 let spans = get_spans_of_pat_idents(src);
1170 let Span{ lo, hi, .. } = spans[0];
1171 assert!("self" == &src[lo.to_usize()..hi.to_usize()],
1172 "\"{}\" != \"self\". src=\"{}\"",
1173 &src[lo.to_usize()..hi.to_usize()], 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 */");