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
13 use rustc_data_structures::sync::{Lrc, Lock};
14 use ast::{self, CrateConfig, NodeId};
15 use early_buffered_lints::{BufferedEarlyLint, BufferedEarlyLintId};
16 use codemap::{CodeMap, FilePathMapping};
17 use syntax_pos::{Span, FileMap, FileName, MultiSpan};
18 use errors::{Handler, ColorConfig, DiagnosticBuilder};
19 use feature_gate::UnstableFeatures;
20 use parse::parser::Parser;
24 use tokenstream::{TokenStream, TokenTree};
25 use diagnostics::plugin::ErrorMap;
28 use std::collections::HashSet;
30 use std::path::{Path, PathBuf};
33 pub type PResult<'a, T> = Result<T, DiagnosticBuilder<'a>>;
44 /// Info about a parsing session.
45 pub struct ParseSess {
46 pub span_diagnostic: Handler,
47 pub unstable_features: UnstableFeatures,
48 pub config: CrateConfig,
49 pub missing_fragment_specifiers: Lock<HashSet<Span>>,
50 /// Places where raw identifiers were used. This is used for feature gating
52 pub raw_identifier_spans: Lock<Vec<Span>>,
53 /// The registered diagnostics codes
54 crate registered_diagnostics: Lock<ErrorMap>,
55 // Spans where a `mod foo;` statement was included in a non-mod.rs file.
56 // These are used to issue errors if the non_modrs_mods feature is not enabled.
57 pub non_modrs_mods: Lock<Vec<(ast::Ident, Span)>>,
58 /// Used to determine and report recursive mod inclusions
59 included_mod_stack: Lock<Vec<PathBuf>>,
60 code_map: Lrc<CodeMap>,
61 pub buffered_lints: Lock<Vec<BufferedEarlyLint>>,
65 pub fn new(file_path_mapping: FilePathMapping) -> Self {
66 let cm = Lrc::new(CodeMap::new(file_path_mapping));
67 let handler = Handler::with_tty_emitter(ColorConfig::Auto,
71 ParseSess::with_span_handler(handler, cm)
74 pub fn with_span_handler(handler: Handler, code_map: Lrc<CodeMap>) -> ParseSess {
76 span_diagnostic: handler,
77 unstable_features: UnstableFeatures::from_environment(),
78 config: HashSet::new(),
79 missing_fragment_specifiers: Lock::new(HashSet::new()),
80 raw_identifier_spans: Lock::new(Vec::new()),
81 registered_diagnostics: Lock::new(ErrorMap::new()),
82 included_mod_stack: Lock::new(vec![]),
84 non_modrs_mods: Lock::new(vec![]),
85 buffered_lints: Lock::new(vec![]),
89 pub fn codemap(&self) -> &CodeMap {
93 pub fn buffer_lint<S: Into<MultiSpan>>(&self,
94 lint_id: BufferedEarlyLintId,
99 self.buffered_lints.with_lock(|buffered_lints| {
100 buffered_lints.push(BufferedEarlyLint{
111 pub struct Directory<'a> {
112 pub path: Cow<'a, Path>,
113 pub ownership: DirectoryOwnership,
116 #[derive(Copy, Clone)]
117 pub enum DirectoryOwnership {
119 // None if `mod.rs`, `Some("foo")` if we're in `foo.rs`
120 relative: Option<ast::Ident>,
123 UnownedViaMod(bool /* legacy warnings? */),
126 // a bunch of utility functions of the form parse_<thing>_from_<source>
127 // where <thing> includes crate, expr, item, stmt, tts, and one that
128 // uses a HOF to parse anything, and <source> includes file and
131 pub fn parse_crate_from_file<'a>(input: &Path, sess: &'a ParseSess) -> PResult<'a, ast::Crate> {
132 let mut parser = new_parser_from_file(sess, input);
133 parser.parse_crate_mod()
136 pub fn parse_crate_attrs_from_file<'a>(input: &Path, sess: &'a ParseSess)
137 -> PResult<'a, Vec<ast::Attribute>> {
138 let mut parser = new_parser_from_file(sess, input);
139 parser.parse_inner_attributes()
142 pub fn parse_crate_from_source_str(name: FileName, source: String, sess: &ParseSess)
143 -> PResult<ast::Crate> {
144 new_parser_from_source_str(sess, name, source).parse_crate_mod()
147 pub fn parse_crate_attrs_from_source_str(name: FileName, source: String, sess: &ParseSess)
148 -> PResult<Vec<ast::Attribute>> {
149 new_parser_from_source_str(sess, name, source).parse_inner_attributes()
152 crate fn parse_expr_from_source_str(name: FileName, source: String, sess: &ParseSess)
153 -> PResult<P<ast::Expr>> {
154 new_parser_from_source_str(sess, name, source).parse_expr()
159 /// Returns `Ok(Some(item))` when successful, `Ok(None)` when no item was found, and `Err`
160 /// when a syntax error occurred.
161 crate fn parse_item_from_source_str(name: FileName, source: String, sess: &ParseSess)
162 -> PResult<Option<P<ast::Item>>> {
163 new_parser_from_source_str(sess, name, source).parse_item()
166 crate fn parse_stmt_from_source_str(name: FileName, source: String, sess: &ParseSess)
167 -> PResult<Option<ast::Stmt>> {
168 new_parser_from_source_str(sess, name, source).parse_stmt()
171 pub fn parse_stream_from_source_str(name: FileName, source: String, sess: &ParseSess,
172 override_span: Option<Span>)
174 filemap_to_stream(sess, sess.codemap().new_filemap(name, source), override_span)
177 // Create a new parser from a source string
178 pub fn new_parser_from_source_str(sess: &ParseSess, name: FileName, source: String)
180 let mut parser = filemap_to_parser(sess, sess.codemap().new_filemap(name, source));
181 parser.recurse_into_file_modules = false;
185 /// Create a new parser, handling errors as appropriate
186 /// if the file doesn't exist
187 pub fn new_parser_from_file<'a>(sess: &'a ParseSess, path: &Path) -> Parser<'a> {
188 filemap_to_parser(sess, file_to_filemap(sess, path, None))
191 /// Given a session, a crate config, a path, and a span, add
192 /// the file at the given path to the codemap, and return a parser.
193 /// On an error, use the given span as the source of the problem.
194 crate fn new_sub_parser_from_file<'a>(sess: &'a ParseSess,
196 directory_ownership: DirectoryOwnership,
197 module_name: Option<String>,
198 sp: Span) -> Parser<'a> {
199 let mut p = filemap_to_parser(sess, file_to_filemap(sess, path, Some(sp)));
200 p.directory.ownership = directory_ownership;
201 p.root_module_name = module_name;
205 /// Given a filemap and config, return a parser
206 fn filemap_to_parser(sess: & ParseSess, filemap: Lrc<FileMap>) -> Parser {
207 let end_pos = filemap.end_pos;
208 let mut parser = stream_to_parser(sess, filemap_to_stream(sess, filemap, None));
210 if parser.token == token::Eof && parser.span.is_dummy() {
211 parser.span = Span::new(end_pos, end_pos, parser.span.ctxt());
217 // must preserve old name for now, because quote! from the *existing*
218 // compiler expands into it
219 pub fn new_parser_from_tts(sess: &ParseSess, tts: Vec<TokenTree>) -> Parser {
220 stream_to_parser(sess, tts.into_iter().collect())
226 /// Given a session and a path and an optional span (for error reporting),
227 /// add the path to the session's codemap and return the new filemap.
228 fn file_to_filemap(sess: &ParseSess, path: &Path, spanopt: Option<Span>)
230 match sess.codemap().load_file(path) {
231 Ok(filemap) => filemap,
233 let msg = format!("couldn't read {:?}: {}", path.display(), e);
235 Some(sp) => sess.span_diagnostic.span_fatal(sp, &msg).raise(),
236 None => sess.span_diagnostic.fatal(&msg).raise()
242 /// Given a filemap, produce a sequence of token-trees
243 pub fn filemap_to_stream(sess: &ParseSess, filemap: Lrc<FileMap>, override_span: Option<Span>)
245 let mut srdr = lexer::StringReader::new(sess, filemap, override_span);
247 panictry!(srdr.parse_all_token_trees())
250 /// Given stream and the `ParseSess`, produce a parser
251 pub fn stream_to_parser(sess: &ParseSess, stream: TokenStream) -> Parser {
252 Parser::new(sess, stream, None, true, false)
255 /// Parse a string representing a character literal into its final form.
256 /// Rather than just accepting/rejecting a given literal, unescapes it as
257 /// well. Can take any slice prefixed by a character escape. Returns the
258 /// character and the number of characters consumed.
259 fn char_lit(lit: &str, diag: Option<(Span, &Handler)>) -> (char, isize) {
262 // Handle non-escaped chars first.
263 if lit.as_bytes()[0] != b'\\' {
264 // If the first byte isn't '\\' it might part of a multi-byte char, so
265 // get the char with chars().
266 let c = lit.chars().next().unwrap();
270 // Handle escaped chars.
271 match lit.as_bytes()[1] as char {
280 let v = u32::from_str_radix(&lit[2..4], 16).unwrap();
281 let c = char::from_u32(v).unwrap();
285 assert_eq!(lit.as_bytes()[2], b'{');
286 let idx = lit.find('}').unwrap();
288 // All digits and '_' are ascii, so treat each byte as a char.
290 for c in lit[3..idx].bytes() {
291 let c = char::from(c);
293 let x = c.to_digit(16).unwrap();
294 v = v.checked_mul(16).unwrap().checked_add(x).unwrap();
297 let c = char::from_u32(v).unwrap_or_else(|| {
298 if let Some((span, diag)) = diag {
299 let mut diag = diag.struct_span_err(span, "invalid unicode character escape");
301 diag.help("unicode escape must be at most 10FFFF").emit();
303 diag.help("unicode escape must not be a surrogate").emit();
308 (c, (idx + 1) as isize)
310 _ => panic!("lexer should have rejected a bad character escape {}", lit)
314 /// Parse a string representing a string literal into its final form. Does
316 pub fn str_lit(lit: &str, diag: Option<(Span, &Handler)>) -> String {
317 debug!("str_lit: given {}", lit.escape_default());
318 let mut res = String::with_capacity(lit.len());
320 let error = |i| format!("lexer should have rejected {} at {}", lit, i);
322 /// Eat everything up to a non-whitespace
323 fn eat<'a>(it: &mut iter::Peekable<str::CharIndices<'a>>) {
325 match it.peek().map(|x| x.1) {
326 Some(' ') | Some('\n') | Some('\r') | Some('\t') => {
334 let mut chars = lit.char_indices().peekable();
335 while let Some((i, c)) = chars.next() {
338 let ch = chars.peek().unwrap_or_else(|| {
339 panic!("{}", error(i))
344 } else if ch == '\r' {
346 let ch = chars.peek().unwrap_or_else(|| {
347 panic!("{}", error(i))
351 panic!("lexer accepted bare CR");
355 // otherwise, a normal escape
356 let (c, n) = char_lit(&lit[i..], diag);
357 for _ in 0..n - 1 { // we don't need to move past the first \
364 let ch = chars.peek().unwrap_or_else(|| {
365 panic!("{}", error(i))
369 panic!("lexer accepted bare CR");
378 res.shrink_to_fit(); // probably not going to do anything, unless there was an escape.
379 debug!("parse_str_lit: returning {}", res);
383 /// Parse a string representing a raw string literal into its final form. The
384 /// only operation this does is convert embedded CRLF into a single LF.
385 fn raw_str_lit(lit: &str) -> String {
386 debug!("raw_str_lit: given {}", lit.escape_default());
387 let mut res = String::with_capacity(lit.len());
389 let mut chars = lit.chars().peekable();
390 while let Some(c) = chars.next() {
392 if *chars.peek().unwrap() != '\n' {
393 panic!("lexer accepted bare CR");
406 // check if `s` looks like i32 or u1234 etc.
407 fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
409 first_chars.contains(&char_at(s, 0)) &&
410 s[1..].chars().all(|c| '0' <= c && c <= '9')
414 ($opt_diag:expr, |$span:ident, $diag:ident| $($body:tt)*) => {
416 Some(($span, $diag)) => { $($body)* }
422 crate fn lit_token(lit: token::Lit, suf: Option<Symbol>, diag: Option<(Span, &Handler)>)
423 -> (bool /* suffix illegal? */, Option<ast::LitKind>) {
427 token::Byte(i) => (true, Some(LitKind::Byte(byte_lit(&i.as_str()).0))),
428 token::Char(i) => (true, Some(LitKind::Char(char_lit(&i.as_str(), diag).0))),
430 // There are some valid suffixes for integer and float literals,
431 // so all the handling is done internally.
432 token::Integer(s) => (false, integer_lit(&s.as_str(), suf, diag)),
433 token::Float(s) => (false, float_lit(&s.as_str(), suf, diag)),
435 token::Str_(mut sym) => {
436 // If there are no characters requiring special treatment we can
437 // reuse the symbol from the Token. Otherwise, we must generate a
438 // new symbol because the string in the LitKind is different to the
439 // string in the Token.
440 let s = &sym.as_str();
441 if s.as_bytes().iter().any(|&c| c == b'\\' || c == b'\r') {
442 sym = Symbol::intern(&str_lit(s, diag));
444 (true, Some(LitKind::Str(sym, ast::StrStyle::Cooked)))
446 token::StrRaw(mut sym, n) => {
448 let s = &sym.as_str();
449 if s.contains('\r') {
450 sym = Symbol::intern(&raw_str_lit(s));
452 (true, Some(LitKind::Str(sym, ast::StrStyle::Raw(n))))
454 token::ByteStr(i) => {
455 (true, Some(LitKind::ByteStr(byte_str_lit(&i.as_str()))))
457 token::ByteStrRaw(i, _) => {
458 (true, Some(LitKind::ByteStr(Lrc::new(i.to_string().into_bytes()))))
463 fn filtered_float_lit(data: Symbol, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
464 -> Option<ast::LitKind> {
465 debug!("filtered_float_lit: {}, {:?}", data, suffix);
466 let suffix = match suffix {
467 Some(suffix) => suffix,
468 None => return Some(ast::LitKind::FloatUnsuffixed(data)),
471 Some(match &*suffix.as_str() {
472 "f32" => ast::LitKind::Float(data, ast::FloatTy::F32),
473 "f64" => ast::LitKind::Float(data, ast::FloatTy::F64),
475 err!(diag, |span, diag| {
476 if suf.len() >= 2 && looks_like_width_suffix(&['f'], suf) {
477 // if it looks like a width, lets try to be helpful.
478 let msg = format!("invalid width `{}` for float literal", &suf[1..]);
479 diag.struct_span_err(span, &msg).help("valid widths are 32 and 64").emit()
481 let msg = format!("invalid suffix `{}` for float literal", suf);
482 diag.struct_span_err(span, &msg)
483 .help("valid suffixes are `f32` and `f64`")
488 ast::LitKind::FloatUnsuffixed(data)
492 fn float_lit(s: &str, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
493 -> Option<ast::LitKind> {
494 debug!("float_lit: {:?}, {:?}", s, suffix);
495 // FIXME #2252: bounds checking float literals is deferred until trans
496 let s = s.chars().filter(|&c| c != '_').collect::<String>();
497 filtered_float_lit(Symbol::intern(&s), suffix, diag)
500 /// Parse a string representing a byte literal into its final form. Similar to `char_lit`
501 fn byte_lit(lit: &str) -> (u8, usize) {
502 let err = |i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
505 (lit.as_bytes()[0], 1)
507 assert_eq!(lit.as_bytes()[0], b'\\', "{}", err(0));
508 let b = match lit.as_bytes()[1] {
517 match u64::from_str_radix(&lit[2..4], 16).ok() {
524 None => panic!(err(3))
532 fn byte_str_lit(lit: &str) -> Lrc<Vec<u8>> {
533 let mut res = Vec::with_capacity(lit.len());
535 let error = |i| format!("lexer should have rejected {} at {}", lit, i);
537 /// Eat everything up to a non-whitespace
538 fn eat<I: Iterator<Item=(usize, u8)>>(it: &mut iter::Peekable<I>) {
540 match it.peek().map(|x| x.1) {
541 Some(b' ') | Some(b'\n') | Some(b'\r') | Some(b'\t') => {
549 // byte string literals *must* be ASCII, but the escapes don't have to be
550 let mut chars = lit.bytes().enumerate().peekable();
553 Some((i, b'\\')) => {
555 match chars.peek().expect(&em).1 {
556 b'\n' => eat(&mut chars),
559 if chars.peek().expect(&em).1 != b'\n' {
560 panic!("lexer accepted bare CR");
565 // otherwise, a normal escape
566 let (c, n) = byte_lit(&lit[i..]);
567 // we don't need to move past the first \
575 Some((i, b'\r')) => {
577 if chars.peek().expect(&em).1 != b'\n' {
578 panic!("lexer accepted bare CR");
583 Some((_, c)) => res.push(c),
591 fn integer_lit(s: &str, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
592 -> Option<ast::LitKind> {
593 // s can only be ascii, byte indexing is fine
595 let s2 = s.chars().filter(|&c| c != '_').collect::<String>();
598 debug!("integer_lit: {}, {:?}", s, suffix);
602 let mut ty = ast::LitIntType::Unsuffixed;
604 if char_at(s, 0) == '0' && s.len() > 1 {
605 match char_at(s, 1) {
613 // 1f64 and 2f32 etc. are valid float literals.
614 if let Some(suf) = suffix {
615 if looks_like_width_suffix(&['f'], &suf.as_str()) {
616 let err = match base {
617 16 => Some("hexadecimal float literal is not supported"),
618 8 => Some("octal float literal is not supported"),
619 2 => Some("binary float literal is not supported"),
622 if let Some(err) = err {
623 err!(diag, |span, diag| diag.span_err(span, err));
625 return filtered_float_lit(Symbol::intern(s), Some(suf), diag)
633 if let Some(suf) = suffix {
634 if suf.as_str().is_empty() {
635 err!(diag, |span, diag| diag.span_bug(span, "found empty literal suffix in Some"));
637 ty = match &*suf.as_str() {
638 "isize" => ast::LitIntType::Signed(ast::IntTy::Isize),
639 "i8" => ast::LitIntType::Signed(ast::IntTy::I8),
640 "i16" => ast::LitIntType::Signed(ast::IntTy::I16),
641 "i32" => ast::LitIntType::Signed(ast::IntTy::I32),
642 "i64" => ast::LitIntType::Signed(ast::IntTy::I64),
643 "i128" => ast::LitIntType::Signed(ast::IntTy::I128),
644 "usize" => ast::LitIntType::Unsigned(ast::UintTy::Usize),
645 "u8" => ast::LitIntType::Unsigned(ast::UintTy::U8),
646 "u16" => ast::LitIntType::Unsigned(ast::UintTy::U16),
647 "u32" => ast::LitIntType::Unsigned(ast::UintTy::U32),
648 "u64" => ast::LitIntType::Unsigned(ast::UintTy::U64),
649 "u128" => ast::LitIntType::Unsigned(ast::UintTy::U128),
651 // i<digits> and u<digits> look like widths, so lets
652 // give an error message along those lines
653 err!(diag, |span, diag| {
654 if looks_like_width_suffix(&['i', 'u'], suf) {
655 let msg = format!("invalid width `{}` for integer literal", &suf[1..]);
656 diag.struct_span_err(span, &msg)
657 .help("valid widths are 8, 16, 32, 64 and 128")
660 let msg = format!("invalid suffix `{}` for numeric literal", suf);
661 diag.struct_span_err(span, &msg)
662 .help("the suffix must be one of the integral types \
663 (`u32`, `isize`, etc)")
673 debug!("integer_lit: the type is {:?}, base {:?}, the new string is {:?}, the original \
674 string was {:?}, the original suffix was {:?}", ty, base, s, orig, suffix);
676 Some(match u128::from_str_radix(s, base) {
677 Ok(r) => ast::LitKind::Int(r, ty),
679 // small bases are lexed as if they were base 10, e.g, the string
680 // might be `0b10201`. This will cause the conversion above to fail,
681 // but these cases have errors in the lexer: we don't want to emit
682 // two errors, and we especially don't want to emit this error since
683 // it isn't necessarily true.
684 let already_errored = base < 10 &&
685 s.chars().any(|c| c.to_digit(10).map_or(false, |d| d >= base));
687 if !already_errored {
688 err!(diag, |span, diag| diag.span_err(span, "int literal is too large"));
690 ast::LitKind::Int(0, ty)
695 /// `SeqSep` : a sequence separator (token)
696 /// and whether a trailing separator is allowed.
698 pub sep: Option<token::Token>,
699 pub trailing_sep_allowed: bool,
703 pub fn trailing_allowed(t: token::Token) -> SeqSep {
706 trailing_sep_allowed: true,
710 pub fn none() -> SeqSep {
713 trailing_sep_allowed: false,
721 use syntax_pos::{Span, BytePos, Pos, NO_EXPANSION};
722 use ast::{self, Ident, PatKind};
723 use attr::first_attr_value_str_by_name;
725 use print::pprust::item_to_string;
726 use tokenstream::{self, TokenTree};
727 use util::parser_testing::string_to_stream;
728 use util::parser_testing::{string_to_expr, string_to_item};
731 // produce a syntax_pos::span
732 fn sp(a: u32, b: u32) -> Span {
733 Span::new(BytePos(a), BytePos(b), NO_EXPANSION)
737 #[test] fn bad_path_expr_1() {
739 string_to_expr("::abc::def::return".to_string());
743 // check the token-tree-ization of macros
745 fn string_to_tts_macro () {
748 string_to_stream("macro_rules! zip (($a)=>($a))".to_string()).trees().collect();
749 let tts: &[TokenTree] = &tts[..];
751 match (tts.len(), tts.get(0), tts.get(1), tts.get(2), tts.get(3)) {
754 Some(&TokenTree::Token(_, token::Ident(name_macro_rules, false))),
755 Some(&TokenTree::Token(_, token::Not)),
756 Some(&TokenTree::Token(_, token::Ident(name_zip, false))),
757 Some(&TokenTree::Delimited(_, ref macro_delimed)),
759 if name_macro_rules.name == "macro_rules"
760 && name_zip.name == "zip" => {
761 let tts = ¯o_delimed.stream().trees().collect::<Vec<_>>();
762 match (tts.len(), tts.get(0), tts.get(1), tts.get(2)) {
765 Some(&TokenTree::Delimited(_, ref first_delimed)),
766 Some(&TokenTree::Token(_, token::FatArrow)),
767 Some(&TokenTree::Delimited(_, ref second_delimed)),
769 if macro_delimed.delim == token::Paren => {
770 let tts = &first_delimed.stream().trees().collect::<Vec<_>>();
771 match (tts.len(), tts.get(0), tts.get(1)) {
774 Some(&TokenTree::Token(_, token::Dollar)),
775 Some(&TokenTree::Token(_, token::Ident(ident, false))),
777 if first_delimed.delim == token::Paren && ident.name == "a" => {},
778 _ => panic!("value 3: {:?}", *first_delimed),
780 let tts = &second_delimed.stream().trees().collect::<Vec<_>>();
781 match (tts.len(), tts.get(0), tts.get(1)) {
784 Some(&TokenTree::Token(_, token::Dollar)),
785 Some(&TokenTree::Token(_, token::Ident(ident, false))),
787 if second_delimed.delim == token::Paren
788 && ident.name == "a" => {},
789 _ => panic!("value 4: {:?}", *second_delimed),
792 _ => panic!("value 2: {:?}", *macro_delimed),
795 _ => panic!("value: {:?}",tts),
801 fn string_to_tts_1() {
803 let tts = string_to_stream("fn a (b : i32) { b; }".to_string());
805 let expected = TokenStream::concat(vec![
806 TokenTree::Token(sp(0, 2), token::Ident(Ident::from_str("fn"), false)).into(),
807 TokenTree::Token(sp(3, 4), token::Ident(Ident::from_str("a"), false)).into(),
808 TokenTree::Delimited(
810 tokenstream::Delimited {
811 delim: token::DelimToken::Paren,
812 tts: TokenStream::concat(vec![
813 TokenTree::Token(sp(6, 7),
814 token::Ident(Ident::from_str("b"), false)).into(),
815 TokenTree::Token(sp(8, 9), token::Colon).into(),
816 TokenTree::Token(sp(10, 13),
817 token::Ident(Ident::from_str("i32"), false)).into(),
820 TokenTree::Delimited(
822 tokenstream::Delimited {
823 delim: token::DelimToken::Brace,
824 tts: TokenStream::concat(vec![
825 TokenTree::Token(sp(17, 18),
826 token::Ident(Ident::from_str("b"), false)).into(),
827 TokenTree::Token(sp(18, 19), token::Semi).into(),
832 assert_eq!(tts, expected);
836 #[test] fn parse_use() {
838 let use_s = "use foo::bar::baz;";
839 let vitem = string_to_item(use_s.to_string()).unwrap();
840 let vitem_s = item_to_string(&vitem);
841 assert_eq!(&vitem_s[..], use_s);
843 let use_s = "use foo::bar as baz;";
844 let vitem = string_to_item(use_s.to_string()).unwrap();
845 let vitem_s = item_to_string(&vitem);
846 assert_eq!(&vitem_s[..], use_s);
850 #[test] fn parse_extern_crate() {
852 let ex_s = "extern crate foo;";
853 let vitem = string_to_item(ex_s.to_string()).unwrap();
854 let vitem_s = item_to_string(&vitem);
855 assert_eq!(&vitem_s[..], ex_s);
857 let ex_s = "extern crate foo as bar;";
858 let vitem = string_to_item(ex_s.to_string()).unwrap();
859 let vitem_s = item_to_string(&vitem);
860 assert_eq!(&vitem_s[..], ex_s);
864 fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
865 let item = string_to_item(src.to_string()).unwrap();
867 struct PatIdentVisitor {
870 impl<'a> ::visit::Visitor<'a> for PatIdentVisitor {
871 fn visit_pat(&mut self, p: &'a ast::Pat) {
873 PatKind::Ident(_ , ref spannedident, _) => {
874 self.spans.push(spannedident.span.clone());
877 ::visit::walk_pat(self, p);
882 let mut v = PatIdentVisitor { spans: Vec::new() };
883 ::visit::walk_item(&mut v, &item);
887 #[test] fn span_of_self_arg_pat_idents_are_correct() {
890 let srcs = ["impl z { fn a (&self, &myarg: i32) {} }",
891 "impl z { fn a (&mut self, &myarg: i32) {} }",
892 "impl z { fn a (&'a self, &myarg: i32) {} }",
893 "impl z { fn a (self, &myarg: i32) {} }",
894 "impl z { fn a (self: Foo, &myarg: i32) {} }",
898 let spans = get_spans_of_pat_idents(src);
899 let (lo, hi) = (spans[0].lo(), spans[0].hi());
900 assert!("self" == &src[lo.to_usize()..hi.to_usize()],
901 "\"{}\" != \"self\". src=\"{}\"",
902 &src[lo.to_usize()..hi.to_usize()], src)
907 #[test] fn parse_exprs () {
909 // just make sure that they parse....
910 string_to_expr("3 + 4".to_string());
911 string_to_expr("a::z.froob(b,&(987+3))".to_string());
915 #[test] fn attrs_fix_bug () {
917 string_to_item("pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
918 -> Result<Box<Writer>, String> {
921 (O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
925 fn wb() -> c_int { O_WRONLY as c_int }
927 let mut fflags: c_int = wb();
932 #[test] fn crlf_doc_comments() {
934 let sess = ParseSess::new(FilePathMapping::empty());
936 let name = FileName::Custom("source".to_string());
937 let source = "/// doc comment\r\nfn foo() {}".to_string();
938 let item = parse_item_from_source_str(name.clone(), source, &sess)
940 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
941 assert_eq!(doc, "/// doc comment");
943 let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
944 let item = parse_item_from_source_str(name.clone(), source, &sess)
946 let docs = item.attrs.iter().filter(|a| a.path == "doc")
947 .map(|a| a.value_str().unwrap().to_string()).collect::<Vec<_>>();
948 let b: &[_] = &["/// doc comment".to_string(), "/// line 2".to_string()];
949 assert_eq!(&docs[..], b);
951 let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
952 let item = parse_item_from_source_str(name, source, &sess).unwrap().unwrap();
953 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
954 assert_eq!(doc, "/** doc comment\n * with CRLF */");
961 let sess = ParseSess::new(FilePathMapping::empty());
962 let expr = parse::parse_expr_from_source_str(PathBuf::from("foo").into(),
963 "foo!( fn main() { body } )".to_string(), &sess).unwrap();
965 let tts: Vec<_> = match expr.node {
966 ast::ExprKind::Mac(ref mac) => mac.node.stream().trees().collect(),
967 _ => panic!("not a macro"),
970 let span = tts.iter().rev().next().unwrap().span();
972 match sess.codemap().span_to_snippet(span) {
973 Ok(s) => assert_eq!(&s[..], "{ body }"),
974 Err(_) => panic!("could not get snippet"),
979 // This tests that when parsing a string (rather than a file) we don't try
980 // and read in a file for a module declaration and just parse a stub.
981 // See `recurse_into_file_modules` in the parser.
983 fn out_of_line_mod() {
985 let sess = ParseSess::new(FilePathMapping::empty());
986 let item = parse_item_from_source_str(
987 PathBuf::from("foo").into(),
988 "mod foo { struct S; mod this_does_not_exist; }".to_owned(),
992 if let ast::ItemKind::Mod(ref m) = item.node {
993 assert!(m.items.len() == 2);