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 source_map::{SourceMap, FilePathMapping};
17 use syntax_pos::{Span, SourceFile, 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;
27 use rustc_data_structures::fx::FxHashSet;
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<FxHashSet<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 source_map: Lrc<SourceMap>,
61 pub buffered_lints: Lock<Vec<BufferedEarlyLint>>,
65 pub fn new(file_path_mapping: FilePathMapping) -> Self {
66 let cm = Lrc::new(SourceMap::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, source_map: Lrc<SourceMap>) -> ParseSess {
76 span_diagnostic: handler,
77 unstable_features: UnstableFeatures::from_environment(),
78 config: FxHashSet::default(),
79 missing_fragment_specifiers: Lock::new(FxHashSet::default()),
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 source_map(&self) -> &SourceMap {
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 source_file_to_stream(sess, sess.source_map().new_source_file(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 = source_file_to_parser(sess, sess.source_map().new_source_file(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 source_file_to_parser(sess, file_to_source_file(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 source_map, 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 = source_file_to_parser(sess, file_to_source_file(sess, path, Some(sp)));
200 p.directory.ownership = directory_ownership;
201 p.root_module_name = module_name;
205 /// Given a source_file and config, return a parser
206 fn source_file_to_parser(sess: & ParseSess, source_file: Lrc<SourceFile>) -> Parser {
207 let end_pos = source_file.end_pos;
208 let mut parser = stream_to_parser(sess, source_file_to_stream(sess, source_file, 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 source_map and return the new source_file.
228 fn file_to_source_file(sess: &ParseSess, path: &Path, spanopt: Option<Span>)
230 match sess.source_map().load_file(path) {
231 Ok(source_file) => source_file,
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 source_file, produce a sequence of token-trees
243 pub fn source_file_to_stream(sess: &ParseSess,
244 source_file: Lrc<SourceFile>,
245 override_span: Option<Span>) -> TokenStream {
246 let mut srdr = lexer::StringReader::new(sess, source_file, override_span);
248 panictry!(srdr.parse_all_token_trees())
251 /// Given stream and the `ParseSess`, produce a parser
252 pub fn stream_to_parser(sess: &ParseSess, stream: TokenStream) -> Parser {
253 Parser::new(sess, stream, None, true, false)
256 /// Parse a string representing a character literal into its final form.
257 /// Rather than just accepting/rejecting a given literal, unescapes it as
258 /// well. Can take any slice prefixed by a character escape. Returns the
259 /// character and the number of characters consumed.
260 fn char_lit(lit: &str, diag: Option<(Span, &Handler)>) -> (char, isize) {
263 // Handle non-escaped chars first.
264 if lit.as_bytes()[0] != b'\\' {
265 // If the first byte isn't '\\' it might part of a multi-byte char, so
266 // get the char with chars().
267 let c = lit.chars().next().unwrap();
271 // Handle escaped chars.
272 match lit.as_bytes()[1] as char {
281 let v = u32::from_str_radix(&lit[2..4], 16).unwrap();
282 let c = char::from_u32(v).unwrap();
286 assert_eq!(lit.as_bytes()[2], b'{');
287 let idx = lit.find('}').unwrap();
289 // All digits and '_' are ascii, so treat each byte as a char.
291 for c in lit[3..idx].bytes() {
292 let c = char::from(c);
294 let x = c.to_digit(16).unwrap();
295 v = v.checked_mul(16).unwrap().checked_add(x).unwrap();
298 let c = char::from_u32(v).unwrap_or_else(|| {
299 if let Some((span, diag)) = diag {
300 let mut diag = diag.struct_span_err(span, "invalid unicode character escape");
302 diag.help("unicode escape must be at most 10FFFF").emit();
304 diag.help("unicode escape must not be a surrogate").emit();
309 (c, (idx + 1) as isize)
311 _ => panic!("lexer should have rejected a bad character escape {}", lit)
315 /// Parse a string representing a string literal into its final form. Does
317 pub fn str_lit(lit: &str, diag: Option<(Span, &Handler)>) -> String {
318 debug!("str_lit: given {}", lit.escape_default());
319 let mut res = String::with_capacity(lit.len());
321 let error = |i| format!("lexer should have rejected {} at {}", lit, i);
323 /// Eat everything up to a non-whitespace
324 fn eat<'a>(it: &mut iter::Peekable<str::CharIndices<'a>>) {
326 match it.peek().map(|x| x.1) {
327 Some(' ') | Some('\n') | Some('\r') | Some('\t') => {
335 let mut chars = lit.char_indices().peekable();
336 while let Some((i, c)) = chars.next() {
339 let ch = chars.peek().unwrap_or_else(|| {
340 panic!("{}", error(i))
345 } else if ch == '\r' {
347 let ch = chars.peek().unwrap_or_else(|| {
348 panic!("{}", error(i))
352 panic!("lexer accepted bare CR");
356 // otherwise, a normal escape
357 let (c, n) = char_lit(&lit[i..], diag);
358 for _ in 0..n - 1 { // we don't need to move past the first \
365 let ch = chars.peek().unwrap_or_else(|| {
366 panic!("{}", error(i))
370 panic!("lexer accepted bare CR");
379 res.shrink_to_fit(); // probably not going to do anything, unless there was an escape.
380 debug!("parse_str_lit: returning {}", res);
384 /// Parse a string representing a raw string literal into its final form. The
385 /// only operation this does is convert embedded CRLF into a single LF.
386 fn raw_str_lit(lit: &str) -> String {
387 debug!("raw_str_lit: given {}", lit.escape_default());
388 let mut res = String::with_capacity(lit.len());
390 let mut chars = lit.chars().peekable();
391 while let Some(c) = chars.next() {
393 if *chars.peek().unwrap() != '\n' {
394 panic!("lexer accepted bare CR");
407 // check if `s` looks like i32 or u1234 etc.
408 fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
410 first_chars.contains(&char_at(s, 0)) &&
411 s[1..].chars().all(|c| '0' <= c && c <= '9')
415 ($opt_diag:expr, |$span:ident, $diag:ident| $($body:tt)*) => {
417 Some(($span, $diag)) => { $($body)* }
423 crate fn lit_token(lit: token::Lit, suf: Option<Symbol>, diag: Option<(Span, &Handler)>)
424 -> (bool /* suffix illegal? */, Option<ast::LitKind>) {
428 token::Byte(i) => (true, Some(LitKind::Byte(byte_lit(&i.as_str()).0))),
429 token::Char(i) => (true, Some(LitKind::Char(char_lit(&i.as_str(), diag).0))),
431 // There are some valid suffixes for integer and float literals,
432 // so all the handling is done internally.
433 token::Integer(s) => (false, integer_lit(&s.as_str(), suf, diag)),
434 token::Float(s) => (false, float_lit(&s.as_str(), suf, diag)),
436 token::Str_(mut sym) => {
437 // If there are no characters requiring special treatment we can
438 // reuse the symbol from the Token. Otherwise, we must generate a
439 // new symbol because the string in the LitKind is different to the
440 // string in the Token.
441 let s = &sym.as_str();
442 if s.as_bytes().iter().any(|&c| c == b'\\' || c == b'\r') {
443 sym = Symbol::intern(&str_lit(s, diag));
445 (true, Some(LitKind::Str(sym, ast::StrStyle::Cooked)))
447 token::StrRaw(mut sym, n) => {
449 let s = &sym.as_str();
450 if s.contains('\r') {
451 sym = Symbol::intern(&raw_str_lit(s));
453 (true, Some(LitKind::Str(sym, ast::StrStyle::Raw(n))))
455 token::ByteStr(i) => {
456 (true, Some(LitKind::ByteStr(byte_str_lit(&i.as_str()))))
458 token::ByteStrRaw(i, _) => {
459 (true, Some(LitKind::ByteStr(Lrc::new(i.to_string().into_bytes()))))
464 fn filtered_float_lit(data: Symbol, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
465 -> Option<ast::LitKind> {
466 debug!("filtered_float_lit: {}, {:?}", data, suffix);
467 let suffix = match suffix {
468 Some(suffix) => suffix,
469 None => return Some(ast::LitKind::FloatUnsuffixed(data)),
472 Some(match &*suffix.as_str() {
473 "f32" => ast::LitKind::Float(data, ast::FloatTy::F32),
474 "f64" => ast::LitKind::Float(data, ast::FloatTy::F64),
476 err!(diag, |span, diag| {
477 if suf.len() >= 2 && looks_like_width_suffix(&['f'], suf) {
478 // if it looks like a width, lets try to be helpful.
479 let msg = format!("invalid width `{}` for float literal", &suf[1..]);
480 diag.struct_span_err(span, &msg).help("valid widths are 32 and 64").emit()
482 let msg = format!("invalid suffix `{}` for float literal", suf);
483 diag.struct_span_err(span, &msg)
484 .help("valid suffixes are `f32` and `f64`")
489 ast::LitKind::FloatUnsuffixed(data)
493 fn float_lit(s: &str, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
494 -> Option<ast::LitKind> {
495 debug!("float_lit: {:?}, {:?}", s, suffix);
496 // FIXME #2252: bounds checking float literals is deferred until trans
498 // Strip underscores without allocating a new String unless necessary.
500 let s = if s.chars().any(|c| c == '_') {
501 s2 = s.chars().filter(|&c| c != '_').collect::<String>();
507 filtered_float_lit(Symbol::intern(s), suffix, diag)
510 /// Parse a string representing a byte literal into its final form. Similar to `char_lit`
511 fn byte_lit(lit: &str) -> (u8, usize) {
512 let err = |i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
515 (lit.as_bytes()[0], 1)
517 assert_eq!(lit.as_bytes()[0], b'\\', "{}", err(0));
518 let b = match lit.as_bytes()[1] {
527 match u64::from_str_radix(&lit[2..4], 16).ok() {
534 None => panic!(err(3))
542 fn byte_str_lit(lit: &str) -> Lrc<Vec<u8>> {
543 let mut res = Vec::with_capacity(lit.len());
545 let error = |i| panic!("lexer should have rejected {} at {}", lit, i);
547 /// Eat everything up to a non-whitespace
548 fn eat<I: Iterator<Item=(usize, u8)>>(it: &mut iter::Peekable<I>) {
550 match it.peek().map(|x| x.1) {
551 Some(b' ') | Some(b'\n') | Some(b'\r') | Some(b'\t') => {
559 // byte string literals *must* be ASCII, but the escapes don't have to be
560 let mut chars = lit.bytes().enumerate().peekable();
563 Some((i, b'\\')) => {
564 match chars.peek().unwrap_or_else(|| error(i)).1 {
565 b'\n' => eat(&mut chars),
568 if chars.peek().unwrap_or_else(|| error(i)).1 != b'\n' {
569 panic!("lexer accepted bare CR");
574 // otherwise, a normal escape
575 let (c, n) = byte_lit(&lit[i..]);
576 // we don't need to move past the first \
584 Some((i, b'\r')) => {
585 if chars.peek().unwrap_or_else(|| error(i)).1 != b'\n' {
586 panic!("lexer accepted bare CR");
591 Some((_, c)) => res.push(c),
599 fn integer_lit(s: &str, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
600 -> Option<ast::LitKind> {
601 // s can only be ascii, byte indexing is fine
603 // Strip underscores without allocating a new String unless necessary.
605 let mut s = if s.chars().any(|c| c == '_') {
606 s2 = s.chars().filter(|&c| c != '_').collect::<String>();
612 debug!("integer_lit: {}, {:?}", s, suffix);
616 let mut ty = ast::LitIntType::Unsuffixed;
618 if char_at(s, 0) == '0' && s.len() > 1 {
619 match char_at(s, 1) {
627 // 1f64 and 2f32 etc. are valid float literals.
628 if let Some(suf) = suffix {
629 if looks_like_width_suffix(&['f'], &suf.as_str()) {
630 let err = match base {
631 16 => Some("hexadecimal float literal is not supported"),
632 8 => Some("octal float literal is not supported"),
633 2 => Some("binary float literal is not supported"),
636 if let Some(err) = err {
637 err!(diag, |span, diag| diag.span_err(span, err));
639 return filtered_float_lit(Symbol::intern(s), Some(suf), diag)
647 if let Some(suf) = suffix {
648 if suf.as_str().is_empty() {
649 err!(diag, |span, diag| diag.span_bug(span, "found empty literal suffix in Some"));
651 ty = match &*suf.as_str() {
652 "isize" => ast::LitIntType::Signed(ast::IntTy::Isize),
653 "i8" => ast::LitIntType::Signed(ast::IntTy::I8),
654 "i16" => ast::LitIntType::Signed(ast::IntTy::I16),
655 "i32" => ast::LitIntType::Signed(ast::IntTy::I32),
656 "i64" => ast::LitIntType::Signed(ast::IntTy::I64),
657 "i128" => ast::LitIntType::Signed(ast::IntTy::I128),
658 "usize" => ast::LitIntType::Unsigned(ast::UintTy::Usize),
659 "u8" => ast::LitIntType::Unsigned(ast::UintTy::U8),
660 "u16" => ast::LitIntType::Unsigned(ast::UintTy::U16),
661 "u32" => ast::LitIntType::Unsigned(ast::UintTy::U32),
662 "u64" => ast::LitIntType::Unsigned(ast::UintTy::U64),
663 "u128" => ast::LitIntType::Unsigned(ast::UintTy::U128),
665 // i<digits> and u<digits> look like widths, so lets
666 // give an error message along those lines
667 err!(diag, |span, diag| {
668 if looks_like_width_suffix(&['i', 'u'], suf) {
669 let msg = format!("invalid width `{}` for integer literal", &suf[1..]);
670 diag.struct_span_err(span, &msg)
671 .help("valid widths are 8, 16, 32, 64 and 128")
674 let msg = format!("invalid suffix `{}` for numeric literal", suf);
675 diag.struct_span_err(span, &msg)
676 .help("the suffix must be one of the integral types \
677 (`u32`, `isize`, etc)")
687 debug!("integer_lit: the type is {:?}, base {:?}, the new string is {:?}, the original \
688 string was {:?}, the original suffix was {:?}", ty, base, s, orig, suffix);
690 Some(match u128::from_str_radix(s, base) {
691 Ok(r) => ast::LitKind::Int(r, ty),
693 // small bases are lexed as if they were base 10, e.g, the string
694 // might be `0b10201`. This will cause the conversion above to fail,
695 // but these cases have errors in the lexer: we don't want to emit
696 // two errors, and we especially don't want to emit this error since
697 // it isn't necessarily true.
698 let already_errored = base < 10 &&
699 s.chars().any(|c| c.to_digit(10).map_or(false, |d| d >= base));
701 if !already_errored {
702 err!(diag, |span, diag| diag.span_err(span, "int literal is too large"));
704 ast::LitKind::Int(0, ty)
709 /// `SeqSep` : a sequence separator (token)
710 /// and whether a trailing separator is allowed.
712 pub sep: Option<token::Token>,
713 pub trailing_sep_allowed: bool,
717 pub fn trailing_allowed(t: token::Token) -> SeqSep {
720 trailing_sep_allowed: true,
724 pub fn none() -> SeqSep {
727 trailing_sep_allowed: false,
735 use syntax_pos::{Span, BytePos, Pos, NO_EXPANSION};
736 use ast::{self, Ident, PatKind};
737 use attr::first_attr_value_str_by_name;
739 use print::pprust::item_to_string;
740 use tokenstream::{self, DelimSpan, TokenTree};
741 use util::parser_testing::string_to_stream;
742 use util::parser_testing::{string_to_expr, string_to_item};
745 // produce a syntax_pos::span
746 fn sp(a: u32, b: u32) -> Span {
747 Span::new(BytePos(a), BytePos(b), NO_EXPANSION)
751 #[test] fn bad_path_expr_1() {
753 string_to_expr("::abc::def::return".to_string());
757 // check the token-tree-ization of macros
759 fn string_to_tts_macro () {
762 string_to_stream("macro_rules! zip (($a)=>($a))".to_string()).trees().collect();
763 let tts: &[TokenTree] = &tts[..];
765 match (tts.len(), tts.get(0), tts.get(1), tts.get(2), tts.get(3)) {
768 Some(&TokenTree::Token(_, token::Ident(name_macro_rules, false))),
769 Some(&TokenTree::Token(_, token::Not)),
770 Some(&TokenTree::Token(_, token::Ident(name_zip, false))),
771 Some(&TokenTree::Delimited(_, ref macro_delimed)),
773 if name_macro_rules.name == "macro_rules"
774 && name_zip.name == "zip" => {
775 let tts = ¯o_delimed.stream().trees().collect::<Vec<_>>();
776 match (tts.len(), tts.get(0), tts.get(1), tts.get(2)) {
779 Some(&TokenTree::Delimited(_, ref first_delimed)),
780 Some(&TokenTree::Token(_, token::FatArrow)),
781 Some(&TokenTree::Delimited(_, ref second_delimed)),
783 if macro_delimed.delim == token::Paren => {
784 let tts = &first_delimed.stream().trees().collect::<Vec<_>>();
785 match (tts.len(), tts.get(0), tts.get(1)) {
788 Some(&TokenTree::Token(_, token::Dollar)),
789 Some(&TokenTree::Token(_, token::Ident(ident, false))),
791 if first_delimed.delim == token::Paren && ident.name == "a" => {},
792 _ => panic!("value 3: {:?}", *first_delimed),
794 let tts = &second_delimed.stream().trees().collect::<Vec<_>>();
795 match (tts.len(), tts.get(0), tts.get(1)) {
798 Some(&TokenTree::Token(_, token::Dollar)),
799 Some(&TokenTree::Token(_, token::Ident(ident, false))),
801 if second_delimed.delim == token::Paren
802 && ident.name == "a" => {},
803 _ => panic!("value 4: {:?}", *second_delimed),
806 _ => panic!("value 2: {:?}", *macro_delimed),
809 _ => panic!("value: {:?}",tts),
815 fn string_to_tts_1() {
817 let tts = string_to_stream("fn a (b : i32) { b; }".to_string());
819 let expected = TokenStream::concat(vec![
820 TokenTree::Token(sp(0, 2), token::Ident(Ident::from_str("fn"), false)).into(),
821 TokenTree::Token(sp(3, 4), token::Ident(Ident::from_str("a"), false)).into(),
822 TokenTree::Delimited(
823 DelimSpan::from_pair(sp(5, 6), sp(13, 14)),
824 tokenstream::Delimited {
825 delim: token::DelimToken::Paren,
826 tts: TokenStream::concat(vec![
827 TokenTree::Token(sp(6, 7),
828 token::Ident(Ident::from_str("b"), false)).into(),
829 TokenTree::Token(sp(8, 9), token::Colon).into(),
830 TokenTree::Token(sp(10, 13),
831 token::Ident(Ident::from_str("i32"), false)).into(),
834 TokenTree::Delimited(
835 DelimSpan::from_pair(sp(15, 16), sp(20, 21)),
836 tokenstream::Delimited {
837 delim: token::DelimToken::Brace,
838 tts: TokenStream::concat(vec![
839 TokenTree::Token(sp(17, 18),
840 token::Ident(Ident::from_str("b"), false)).into(),
841 TokenTree::Token(sp(18, 19), token::Semi).into(),
846 assert_eq!(tts, expected);
850 #[test] fn parse_use() {
852 let use_s = "use foo::bar::baz;";
853 let vitem = string_to_item(use_s.to_string()).unwrap();
854 let vitem_s = item_to_string(&vitem);
855 assert_eq!(&vitem_s[..], use_s);
857 let use_s = "use foo::bar as baz;";
858 let vitem = string_to_item(use_s.to_string()).unwrap();
859 let vitem_s = item_to_string(&vitem);
860 assert_eq!(&vitem_s[..], use_s);
864 #[test] fn parse_extern_crate() {
866 let ex_s = "extern crate foo;";
867 let vitem = string_to_item(ex_s.to_string()).unwrap();
868 let vitem_s = item_to_string(&vitem);
869 assert_eq!(&vitem_s[..], ex_s);
871 let ex_s = "extern crate foo as bar;";
872 let vitem = string_to_item(ex_s.to_string()).unwrap();
873 let vitem_s = item_to_string(&vitem);
874 assert_eq!(&vitem_s[..], ex_s);
878 fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
879 let item = string_to_item(src.to_string()).unwrap();
881 struct PatIdentVisitor {
884 impl<'a> ::visit::Visitor<'a> for PatIdentVisitor {
885 fn visit_pat(&mut self, p: &'a ast::Pat) {
887 PatKind::Ident(_ , ref spannedident, _) => {
888 self.spans.push(spannedident.span.clone());
891 ::visit::walk_pat(self, p);
896 let mut v = PatIdentVisitor { spans: Vec::new() };
897 ::visit::walk_item(&mut v, &item);
901 #[test] fn span_of_self_arg_pat_idents_are_correct() {
904 let srcs = ["impl z { fn a (&self, &myarg: i32) {} }",
905 "impl z { fn a (&mut self, &myarg: i32) {} }",
906 "impl z { fn a (&'a self, &myarg: i32) {} }",
907 "impl z { fn a (self, &myarg: i32) {} }",
908 "impl z { fn a (self: Foo, &myarg: i32) {} }",
912 let spans = get_spans_of_pat_idents(src);
913 let (lo, hi) = (spans[0].lo(), spans[0].hi());
914 assert!("self" == &src[lo.to_usize()..hi.to_usize()],
915 "\"{}\" != \"self\". src=\"{}\"",
916 &src[lo.to_usize()..hi.to_usize()], src)
921 #[test] fn parse_exprs () {
923 // just make sure that they parse....
924 string_to_expr("3 + 4".to_string());
925 string_to_expr("a::z.froob(b,&(987+3))".to_string());
929 #[test] fn attrs_fix_bug () {
931 string_to_item("pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
932 -> Result<Box<Writer>, String> {
935 (O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
939 fn wb() -> c_int { O_WRONLY as c_int }
941 let mut fflags: c_int = wb();
946 #[test] fn crlf_doc_comments() {
948 let sess = ParseSess::new(FilePathMapping::empty());
950 let name = FileName::Custom("source".to_string());
951 let source = "/// doc comment\r\nfn foo() {}".to_string();
952 let item = parse_item_from_source_str(name.clone(), source, &sess)
954 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
955 assert_eq!(doc, "/// doc comment");
957 let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
958 let item = parse_item_from_source_str(name.clone(), source, &sess)
960 let docs = item.attrs.iter().filter(|a| a.path == "doc")
961 .map(|a| a.value_str().unwrap().to_string()).collect::<Vec<_>>();
962 let b: &[_] = &["/// doc comment".to_string(), "/// line 2".to_string()];
963 assert_eq!(&docs[..], b);
965 let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
966 let item = parse_item_from_source_str(name, source, &sess).unwrap().unwrap();
967 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
968 assert_eq!(doc, "/** doc comment\n * with CRLF */");
975 let sess = ParseSess::new(FilePathMapping::empty());
976 let expr = parse::parse_expr_from_source_str(PathBuf::from("foo").into(),
977 "foo!( fn main() { body } )".to_string(), &sess).unwrap();
979 let tts: Vec<_> = match expr.node {
980 ast::ExprKind::Mac(ref mac) => mac.node.stream().trees().collect(),
981 _ => panic!("not a macro"),
984 let span = tts.iter().rev().next().unwrap().span();
986 match sess.source_map().span_to_snippet(span) {
987 Ok(s) => assert_eq!(&s[..], "{ body }"),
988 Err(_) => panic!("could not get snippet"),
993 // This tests that when parsing a string (rather than a file) we don't try
994 // and read in a file for a module declaration and just parse a stub.
995 // See `recurse_into_file_modules` in the parser.
997 fn out_of_line_mod() {
999 let sess = ParseSess::new(FilePathMapping::empty());
1000 let item = parse_item_from_source_str(
1001 PathBuf::from("foo").into(),
1002 "mod foo { struct S; mod this_does_not_exist; }".to_owned(),
1004 ).unwrap().unwrap();
1006 if let ast::ItemKind::Mod(ref m) = item.node {
1007 assert!(m.items.len() == 2);