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 ast::{self, CrateConfig};
15 use syntax_pos::{self, Span, FileMap};
16 use errors::{Handler, ColorConfig, DiagnosticBuilder};
17 use feature_gate::UnstableFeatures;
18 use parse::parser::Parser;
22 use tokenstream::{TokenStream, TokenTree};
24 use std::cell::RefCell;
25 use std::collections::HashSet;
27 use std::path::{Path, PathBuf};
31 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: RefCell<HashSet<Span>>,
50 /// Used to determine and report recursive mod inclusions
51 included_mod_stack: RefCell<Vec<PathBuf>>,
52 code_map: Rc<CodeMap>,
56 pub fn new() -> Self {
57 let cm = Rc::new(CodeMap::new());
58 let handler = Handler::with_tty_emitter(ColorConfig::Auto,
62 ParseSess::with_span_handler(handler, cm)
65 pub fn with_span_handler(handler: Handler, code_map: Rc<CodeMap>) -> ParseSess {
67 span_diagnostic: handler,
68 unstable_features: UnstableFeatures::from_environment(),
69 config: HashSet::new(),
70 missing_fragment_specifiers: RefCell::new(HashSet::new()),
71 included_mod_stack: RefCell::new(vec![]),
76 pub fn codemap(&self) -> &CodeMap {
82 pub struct Directory {
84 pub ownership: DirectoryOwnership,
87 #[derive(Copy, Clone)]
88 pub enum DirectoryOwnership {
91 UnownedViaMod(bool /* legacy warnings? */),
94 // a bunch of utility functions of the form parse_<thing>_from_<source>
95 // where <thing> includes crate, expr, item, stmt, tts, and one that
96 // uses a HOF to parse anything, and <source> includes file and
99 pub fn parse_crate_from_file<'a>(input: &Path, sess: &'a ParseSess) -> PResult<'a, ast::Crate> {
100 let mut parser = new_parser_from_file(sess, input);
101 parser.parse_crate_mod()
104 pub fn parse_crate_attrs_from_file<'a>(input: &Path, sess: &'a ParseSess)
105 -> PResult<'a, Vec<ast::Attribute>> {
106 let mut parser = new_parser_from_file(sess, input);
107 parser.parse_inner_attributes()
110 pub fn parse_crate_from_source_str<'a>(name: String, source: String, sess: &'a ParseSess)
111 -> PResult<'a, ast::Crate> {
112 new_parser_from_source_str(sess, name, source).parse_crate_mod()
115 pub fn parse_crate_attrs_from_source_str<'a>(name: String, source: String, sess: &'a ParseSess)
116 -> PResult<'a, Vec<ast::Attribute>> {
117 new_parser_from_source_str(sess, name, source).parse_inner_attributes()
120 pub fn parse_expr_from_source_str<'a>(name: String, source: String, sess: &'a ParseSess)
121 -> PResult<'a, P<ast::Expr>> {
122 new_parser_from_source_str(sess, name, source).parse_expr()
127 /// Returns `Ok(Some(item))` when successful, `Ok(None)` when no item was found, and`Err`
128 /// when a syntax error occurred.
129 pub fn parse_item_from_source_str<'a>(name: String, source: String, sess: &'a ParseSess)
130 -> PResult<'a, Option<P<ast::Item>>> {
131 new_parser_from_source_str(sess, name, source).parse_item()
134 pub fn parse_meta_from_source_str<'a>(name: String, source: String, sess: &'a ParseSess)
135 -> PResult<'a, ast::MetaItem> {
136 new_parser_from_source_str(sess, name, source).parse_meta_item()
139 pub fn parse_stmt_from_source_str<'a>(name: String, source: String, sess: &'a ParseSess)
140 -> PResult<'a, Option<ast::Stmt>> {
141 new_parser_from_source_str(sess, name, source).parse_stmt()
144 pub fn parse_stream_from_source_str<'a>(name: String, source: String, sess: &'a ParseSess)
146 filemap_to_stream(sess, sess.codemap().new_filemap(name, None, source))
149 // Create a new parser from a source string
150 pub fn new_parser_from_source_str<'a>(sess: &'a ParseSess, name: String, source: String)
152 filemap_to_parser(sess, sess.codemap().new_filemap(name, None, source))
155 /// Create a new parser, handling errors as appropriate
156 /// if the file doesn't exist
157 pub fn new_parser_from_file<'a>(sess: &'a ParseSess, path: &Path) -> Parser<'a> {
158 filemap_to_parser(sess, file_to_filemap(sess, path, None))
161 /// Given a session, a crate config, a path, and a span, add
162 /// the file at the given path to the codemap, and return a parser.
163 /// On an error, use the given span as the source of the problem.
164 pub fn new_sub_parser_from_file<'a>(sess: &'a ParseSess,
166 directory_ownership: DirectoryOwnership,
167 module_name: Option<String>,
168 sp: Span) -> Parser<'a> {
169 let mut p = filemap_to_parser(sess, file_to_filemap(sess, path, Some(sp)));
170 p.directory.ownership = directory_ownership;
171 p.root_module_name = module_name;
175 /// Given a filemap and config, return a parser
176 pub fn filemap_to_parser<'a>(sess: &'a ParseSess, filemap: Rc<FileMap>, ) -> Parser<'a> {
177 let end_pos = filemap.end_pos;
178 let mut parser = stream_to_parser(sess, filemap_to_stream(sess, filemap));
180 if parser.token == token::Eof && parser.span == syntax_pos::DUMMY_SP {
181 parser.span = syntax_pos::mk_sp(end_pos, end_pos);
187 // must preserve old name for now, because quote! from the *existing*
188 // compiler expands into it
189 pub fn new_parser_from_tts<'a>(sess: &'a ParseSess, tts: Vec<TokenTree>) -> Parser<'a> {
190 stream_to_parser(sess, tts.into_iter().collect())
196 /// Given a session and a path and an optional span (for error reporting),
197 /// add the path to the session's codemap and return the new filemap.
198 fn file_to_filemap(sess: &ParseSess, path: &Path, spanopt: Option<Span>)
200 match sess.codemap().load_file(path) {
201 Ok(filemap) => filemap,
203 let msg = format!("couldn't read {:?}: {}", path.display(), e);
205 Some(sp) => panic!(sess.span_diagnostic.span_fatal(sp, &msg)),
206 None => panic!(sess.span_diagnostic.fatal(&msg))
212 /// Given a filemap, produce a sequence of token-trees
213 pub fn filemap_to_stream(sess: &ParseSess, filemap: Rc<FileMap>) -> TokenStream {
214 let mut srdr = lexer::StringReader::new(sess, filemap);
216 panictry!(srdr.parse_all_token_trees())
219 /// Given stream and the ParseSess, produce a parser
220 pub fn stream_to_parser<'a>(sess: &'a ParseSess, stream: TokenStream) -> Parser<'a> {
221 let mut p = Parser::new(sess, stream, None, false);
222 p.check_unknown_macro_variable();
226 /// Parse a string representing a character literal into its final form.
227 /// Rather than just accepting/rejecting a given literal, unescapes it as
228 /// well. Can take any slice prefixed by a character escape. Returns the
229 /// character and the number of characters consumed.
230 pub fn char_lit(lit: &str) -> (char, isize) {
233 // Handle non-escaped chars first.
234 if lit.as_bytes()[0] != b'\\' {
235 // If the first byte isn't '\\' it might part of a multi-byte char, so
236 // get the char with chars().
237 let c = lit.chars().next().unwrap();
241 // Handle escaped chars.
242 match lit.as_bytes()[1] as char {
251 let v = u32::from_str_radix(&lit[2..4], 16).unwrap();
252 let c = char::from_u32(v).unwrap();
256 assert!(lit.as_bytes()[2] == b'{');
257 let idx = lit.find('}').unwrap();
258 let v = u32::from_str_radix(&lit[3..idx], 16).unwrap();
259 let c = char::from_u32(v).unwrap();
260 (c, (idx + 1) as isize)
262 _ => panic!("lexer should have rejected a bad character escape {}", lit)
266 /// Parse a string representing a string literal into its final form. Does
268 pub fn str_lit(lit: &str) -> String {
269 debug!("parse_str_lit: given {}", lit.escape_default());
270 let mut res = String::with_capacity(lit.len());
272 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
273 let error = |i| format!("lexer should have rejected {} at {}", lit, i);
275 /// Eat everything up to a non-whitespace
276 fn eat<'a>(it: &mut iter::Peekable<str::CharIndices<'a>>) {
278 match it.peek().map(|x| x.1) {
279 Some(' ') | Some('\n') | Some('\r') | Some('\t') => {
287 let mut chars = lit.char_indices().peekable();
293 let ch = chars.peek().unwrap_or_else(|| {
294 panic!("{}", error(i))
299 } else if ch == '\r' {
301 let ch = chars.peek().unwrap_or_else(|| {
302 panic!("{}", error(i))
306 panic!("lexer accepted bare CR");
310 // otherwise, a normal escape
311 let (c, n) = char_lit(&lit[i..]);
312 for _ in 0..n - 1 { // we don't need to move past the first \
319 let ch = chars.peek().unwrap_or_else(|| {
320 panic!("{}", error(i))
324 panic!("lexer accepted bare CR");
336 res.shrink_to_fit(); // probably not going to do anything, unless there was an escape.
337 debug!("parse_str_lit: returning {}", res);
341 /// Parse a string representing a raw string literal into its final form. The
342 /// only operation this does is convert embedded CRLF into a single LF.
343 pub fn raw_str_lit(lit: &str) -> String {
344 debug!("raw_str_lit: given {}", lit.escape_default());
345 let mut res = String::with_capacity(lit.len());
347 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
348 let mut chars = lit.chars().peekable();
353 if *chars.peek().unwrap() != '\n' {
354 panic!("lexer accepted bare CR");
370 // check if `s` looks like i32 or u1234 etc.
371 fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
373 first_chars.contains(&char_at(s, 0)) &&
374 s[1..].chars().all(|c| '0' <= c && c <= '9')
378 ($opt_diag:expr, |$span:ident, $diag:ident| $($body:tt)*) => {
380 Some(($span, $diag)) => { $($body)* }
386 pub fn lit_token(lit: token::Lit, suf: Option<Symbol>, diag: Option<(Span, &Handler)>)
387 -> (bool /* suffix illegal? */, Option<ast::LitKind>) {
391 token::Byte(i) => (true, Some(LitKind::Byte(byte_lit(&i.as_str()).0))),
392 token::Char(i) => (true, Some(LitKind::Char(char_lit(&i.as_str()).0))),
394 // There are some valid suffixes for integer and float literals,
395 // so all the handling is done internally.
396 token::Integer(s) => (false, integer_lit(&s.as_str(), suf, diag)),
397 token::Float(s) => (false, float_lit(&s.as_str(), suf, diag)),
400 let s = Symbol::intern(&str_lit(&s.as_str()));
401 (true, Some(LitKind::Str(s, ast::StrStyle::Cooked)))
403 token::StrRaw(s, n) => {
404 let s = Symbol::intern(&raw_str_lit(&s.as_str()));
405 (true, Some(LitKind::Str(s, ast::StrStyle::Raw(n))))
407 token::ByteStr(i) => {
408 (true, Some(LitKind::ByteStr(byte_str_lit(&i.as_str()))))
410 token::ByteStrRaw(i, _) => {
411 (true, Some(LitKind::ByteStr(Rc::new(i.to_string().into_bytes()))))
416 fn filtered_float_lit(data: Symbol, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
417 -> Option<ast::LitKind> {
418 debug!("filtered_float_lit: {}, {:?}", data, suffix);
419 let suffix = match suffix {
420 Some(suffix) => suffix,
421 None => return Some(ast::LitKind::FloatUnsuffixed(data)),
424 Some(match &*suffix.as_str() {
425 "f32" => ast::LitKind::Float(data, ast::FloatTy::F32),
426 "f64" => ast::LitKind::Float(data, ast::FloatTy::F64),
428 err!(diag, |span, diag| {
429 if suf.len() >= 2 && looks_like_width_suffix(&['f'], suf) {
430 // if it looks like a width, lets try to be helpful.
431 let msg = format!("invalid width `{}` for float literal", &suf[1..]);
432 diag.struct_span_err(span, &msg).help("valid widths are 32 and 64").emit()
434 let msg = format!("invalid suffix `{}` for float literal", suf);
435 diag.struct_span_err(span, &msg)
436 .help("valid suffixes are `f32` and `f64`")
441 ast::LitKind::FloatUnsuffixed(data)
445 pub fn float_lit(s: &str, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
446 -> Option<ast::LitKind> {
447 debug!("float_lit: {:?}, {:?}", s, suffix);
448 // FIXME #2252: bounds checking float literals is deferred until trans
449 let s = s.chars().filter(|&c| c != '_').collect::<String>();
450 filtered_float_lit(Symbol::intern(&s), suffix, diag)
453 /// Parse a string representing a byte literal into its final form. Similar to `char_lit`
454 pub fn byte_lit(lit: &str) -> (u8, usize) {
455 let err = |i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
458 (lit.as_bytes()[0], 1)
460 assert!(lit.as_bytes()[0] == b'\\', err(0));
461 let b = match lit.as_bytes()[1] {
470 match u64::from_str_radix(&lit[2..4], 16).ok() {
477 None => panic!(err(3))
485 pub fn byte_str_lit(lit: &str) -> Rc<Vec<u8>> {
486 let mut res = Vec::with_capacity(lit.len());
488 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
489 let error = |i| format!("lexer should have rejected {} at {}", lit, i);
491 /// Eat everything up to a non-whitespace
492 fn eat<'a, I: Iterator<Item=(usize, u8)>>(it: &mut iter::Peekable<I>) {
494 match it.peek().map(|x| x.1) {
495 Some(b' ') | Some(b'\n') | Some(b'\r') | Some(b'\t') => {
503 // byte string literals *must* be ASCII, but the escapes don't have to be
504 let mut chars = lit.bytes().enumerate().peekable();
507 Some((i, b'\\')) => {
509 match chars.peek().expect(&em).1 {
510 b'\n' => eat(&mut chars),
513 if chars.peek().expect(&em).1 != b'\n' {
514 panic!("lexer accepted bare CR");
519 // otherwise, a normal escape
520 let (c, n) = byte_lit(&lit[i..]);
521 // we don't need to move past the first \
529 Some((i, b'\r')) => {
531 if chars.peek().expect(&em).1 != b'\n' {
532 panic!("lexer accepted bare CR");
537 Some((_, c)) => res.push(c),
545 pub fn integer_lit(s: &str, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
546 -> Option<ast::LitKind> {
547 // s can only be ascii, byte indexing is fine
549 let s2 = s.chars().filter(|&c| c != '_').collect::<String>();
552 debug!("integer_lit: {}, {:?}", s, suffix);
556 let mut ty = ast::LitIntType::Unsuffixed;
558 if char_at(s, 0) == '0' && s.len() > 1 {
559 match char_at(s, 1) {
567 // 1f64 and 2f32 etc. are valid float literals.
568 if let Some(suf) = suffix {
569 if looks_like_width_suffix(&['f'], &suf.as_str()) {
570 let err = match base {
571 16 => Some("hexadecimal float literal is not supported"),
572 8 => Some("octal float literal is not supported"),
573 2 => Some("binary float literal is not supported"),
576 if let Some(err) = err {
577 err!(diag, |span, diag| diag.span_err(span, err));
579 return filtered_float_lit(Symbol::intern(&s), Some(suf), diag)
587 if let Some(suf) = suffix {
588 if suf.as_str().is_empty() {
589 err!(diag, |span, diag| diag.span_bug(span, "found empty literal suffix in Some"));
591 ty = match &*suf.as_str() {
592 "isize" => ast::LitIntType::Signed(ast::IntTy::Is),
593 "i8" => ast::LitIntType::Signed(ast::IntTy::I8),
594 "i16" => ast::LitIntType::Signed(ast::IntTy::I16),
595 "i32" => ast::LitIntType::Signed(ast::IntTy::I32),
596 "i64" => ast::LitIntType::Signed(ast::IntTy::I64),
597 "i128" => ast::LitIntType::Signed(ast::IntTy::I128),
598 "usize" => ast::LitIntType::Unsigned(ast::UintTy::Us),
599 "u8" => ast::LitIntType::Unsigned(ast::UintTy::U8),
600 "u16" => ast::LitIntType::Unsigned(ast::UintTy::U16),
601 "u32" => ast::LitIntType::Unsigned(ast::UintTy::U32),
602 "u64" => ast::LitIntType::Unsigned(ast::UintTy::U64),
603 "u128" => ast::LitIntType::Unsigned(ast::UintTy::U128),
605 // i<digits> and u<digits> look like widths, so lets
606 // give an error message along those lines
607 err!(diag, |span, diag| {
608 if looks_like_width_suffix(&['i', 'u'], suf) {
609 let msg = format!("invalid width `{}` for integer literal", &suf[1..]);
610 diag.struct_span_err(span, &msg)
611 .help("valid widths are 8, 16, 32, 64 and 128")
614 let msg = format!("invalid suffix `{}` for numeric literal", suf);
615 diag.struct_span_err(span, &msg)
616 .help("the suffix must be one of the integral types \
617 (`u32`, `isize`, etc)")
627 debug!("integer_lit: the type is {:?}, base {:?}, the new string is {:?}, the original \
628 string was {:?}, the original suffix was {:?}", ty, base, s, orig, suffix);
630 Some(match u128::from_str_radix(s, base) {
631 Ok(r) => ast::LitKind::Int(r, ty),
633 // small bases are lexed as if they were base 10, e.g, the string
634 // might be `0b10201`. This will cause the conversion above to fail,
635 // but these cases have errors in the lexer: we don't want to emit
636 // two errors, and we especially don't want to emit this error since
637 // it isn't necessarily true.
638 let already_errored = base < 10 &&
639 s.chars().any(|c| c.to_digit(10).map_or(false, |d| d >= base));
641 if !already_errored {
642 err!(diag, |span, diag| diag.span_err(span, "int literal is too large"));
644 ast::LitKind::Int(0, ty)
652 use syntax_pos::{self, Span, BytePos, Pos, NO_EXPANSION};
653 use codemap::Spanned;
654 use ast::{self, Ident, PatKind};
656 use attr::first_attr_value_str_by_name;
658 use parse::parser::Parser;
659 use print::pprust::item_to_string;
661 use tokenstream::{self, TokenTree};
662 use util::parser_testing::{string_to_stream, string_to_parser};
663 use util::parser_testing::{string_to_expr, string_to_item, string_to_stmt};
666 // produce a syntax_pos::span
667 fn sp(a: u32, b: u32) -> Span {
668 Span {lo: BytePos(a), hi: BytePos(b), expn_id: NO_EXPANSION}
671 fn str2seg(s: &str, lo: u32, hi: u32) -> ast::PathSegment {
672 ast::PathSegment::from_ident(Ident::from_str(s), sp(lo, hi))
675 #[test] fn path_exprs_1() {
676 assert!(string_to_expr("a".to_string()) ==
678 id: ast::DUMMY_NODE_ID,
679 node: ast::ExprKind::Path(None, ast::Path {
681 segments: vec![str2seg("a", 0, 1)],
684 attrs: ThinVec::new(),
688 #[test] fn path_exprs_2 () {
689 assert!(string_to_expr("::a::b".to_string()) ==
691 id: ast::DUMMY_NODE_ID,
692 node: ast::ExprKind::Path(None, ast::Path {
694 segments: vec![ast::PathSegment::crate_root(),
699 attrs: ThinVec::new(),
704 #[test] fn bad_path_expr_1() {
705 string_to_expr("::abc::def::return".to_string());
708 // check the token-tree-ization of macros
710 fn string_to_tts_macro () {
712 string_to_stream("macro_rules! zip (($a)=>($a))".to_string()).trees().collect();
713 let tts: &[TokenTree] = &tts[..];
715 match (tts.len(), tts.get(0), tts.get(1), tts.get(2), tts.get(3)) {
718 Some(&TokenTree::Token(_, token::Ident(name_macro_rules))),
719 Some(&TokenTree::Token(_, token::Not)),
720 Some(&TokenTree::Token(_, token::Ident(name_zip))),
721 Some(&TokenTree::Delimited(_, ref macro_delimed)),
723 if name_macro_rules.name == "macro_rules"
724 && name_zip.name == "zip" => {
725 let tts = ¯o_delimed.stream().trees().collect::<Vec<_>>();
726 match (tts.len(), tts.get(0), tts.get(1), tts.get(2)) {
729 Some(&TokenTree::Delimited(_, ref first_delimed)),
730 Some(&TokenTree::Token(_, token::FatArrow)),
731 Some(&TokenTree::Delimited(_, ref second_delimed)),
733 if macro_delimed.delim == token::Paren => {
734 let tts = &first_delimed.stream().trees().collect::<Vec<_>>();
735 match (tts.len(), tts.get(0), tts.get(1)) {
738 Some(&TokenTree::Token(_, token::Dollar)),
739 Some(&TokenTree::Token(_, token::Ident(ident))),
741 if first_delimed.delim == token::Paren && ident.name == "a" => {},
742 _ => panic!("value 3: {:?}", *first_delimed),
744 let tts = &second_delimed.stream().trees().collect::<Vec<_>>();
745 match (tts.len(), tts.get(0), tts.get(1)) {
748 Some(&TokenTree::Token(_, token::Dollar)),
749 Some(&TokenTree::Token(_, token::Ident(ident))),
751 if second_delimed.delim == token::Paren
752 && ident.name == "a" => {},
753 _ => panic!("value 4: {:?}", *second_delimed),
756 _ => panic!("value 2: {:?}", *macro_delimed),
759 _ => panic!("value: {:?}",tts),
764 fn string_to_tts_1() {
765 let tts = string_to_stream("fn a (b : i32) { b; }".to_string());
767 let expected = TokenStream::concat(vec![
768 TokenTree::Token(sp(0, 2), token::Ident(Ident::from_str("fn"))).into(),
769 TokenTree::Token(sp(3, 4), token::Ident(Ident::from_str("a"))).into(),
770 TokenTree::Delimited(
772 tokenstream::Delimited {
773 delim: token::DelimToken::Paren,
774 tts: TokenStream::concat(vec![
775 TokenTree::Token(sp(6, 7), token::Ident(Ident::from_str("b"))).into(),
776 TokenTree::Token(sp(8, 9), token::Colon).into(),
777 TokenTree::Token(sp(10, 13), token::Ident(Ident::from_str("i32"))).into(),
780 TokenTree::Delimited(
782 tokenstream::Delimited {
783 delim: token::DelimToken::Brace,
784 tts: TokenStream::concat(vec![
785 TokenTree::Token(sp(17, 18), token::Ident(Ident::from_str("b"))).into(),
786 TokenTree::Token(sp(18, 19), token::Semi).into(),
791 assert_eq!(tts, expected);
794 #[test] fn ret_expr() {
795 assert!(string_to_expr("return d".to_string()) ==
797 id: ast::DUMMY_NODE_ID,
798 node:ast::ExprKind::Ret(Some(P(ast::Expr{
799 id: ast::DUMMY_NODE_ID,
800 node:ast::ExprKind::Path(None, ast::Path{
802 segments: vec![str2seg("d", 7, 8)],
805 attrs: ThinVec::new(),
808 attrs: ThinVec::new(),
812 #[test] fn parse_stmt_1 () {
813 assert!(string_to_stmt("b;".to_string()) ==
815 node: ast::StmtKind::Expr(P(ast::Expr {
816 id: ast::DUMMY_NODE_ID,
817 node: ast::ExprKind::Path(None, ast::Path {
819 segments: vec![str2seg("b", 0, 1)],
822 attrs: ThinVec::new()})),
823 id: ast::DUMMY_NODE_ID,
828 fn parser_done(p: Parser){
829 assert_eq!(p.token.clone(), token::Eof);
832 #[test] fn parse_ident_pat () {
833 let sess = ParseSess::new();
834 let mut parser = string_to_parser(&sess, "b".to_string());
835 assert!(panictry!(parser.parse_pat())
837 id: ast::DUMMY_NODE_ID,
838 node: PatKind::Ident(ast::BindingMode::ByValue(ast::Mutability::Immutable),
839 Spanned{ span:sp(0, 1),
840 node: Ident::from_str("b")
847 // check the contents of the tt manually:
848 #[test] fn parse_fundecl () {
849 // this test depends on the intern order of "fn" and "i32"
850 assert_eq!(string_to_item("fn a (b : i32) { b; }".to_string()),
852 P(ast::Item{ident:Ident::from_str("a"),
854 id: ast::DUMMY_NODE_ID,
855 node: ast::ItemKind::Fn(P(ast::FnDecl {
856 inputs: vec![ast::Arg{
857 ty: P(ast::Ty{id: ast::DUMMY_NODE_ID,
858 node: ast::TyKind::Path(None, ast::Path{
860 segments: vec![str2seg("i32", 10, 13)],
865 id: ast::DUMMY_NODE_ID,
866 node: PatKind::Ident(
867 ast::BindingMode::ByValue(ast::Mutability::Immutable),
870 node: Ident::from_str("b")},
875 id: ast::DUMMY_NODE_ID
877 output: ast::FunctionRetTy::Default(sp(15, 15)),
880 ast::Unsafety::Normal,
883 node: ast::Constness::NotConst,
886 ast::Generics{ // no idea on either of these:
887 lifetimes: Vec::new(),
888 ty_params: Vec::new(),
889 where_clause: ast::WhereClause {
890 id: ast::DUMMY_NODE_ID,
891 predicates: Vec::new(),
893 span: syntax_pos::DUMMY_SP,
896 stmts: vec![ast::Stmt {
897 node: ast::StmtKind::Semi(P(ast::Expr{
898 id: ast::DUMMY_NODE_ID,
899 node: ast::ExprKind::Path(None,
902 segments: vec![str2seg("b", 17, 18)],
905 attrs: ThinVec::new()})),
906 id: ast::DUMMY_NODE_ID,
908 id: ast::DUMMY_NODE_ID,
909 rules: ast::BlockCheckMode::Default, // no idea
912 vis: ast::Visibility::Inherited,
916 #[test] fn parse_use() {
917 let use_s = "use foo::bar::baz;";
918 let vitem = string_to_item(use_s.to_string()).unwrap();
919 let vitem_s = item_to_string(&vitem);
920 assert_eq!(&vitem_s[..], use_s);
922 let use_s = "use foo::bar as baz;";
923 let vitem = string_to_item(use_s.to_string()).unwrap();
924 let vitem_s = item_to_string(&vitem);
925 assert_eq!(&vitem_s[..], use_s);
928 #[test] fn parse_extern_crate() {
929 let ex_s = "extern crate foo;";
930 let vitem = string_to_item(ex_s.to_string()).unwrap();
931 let vitem_s = item_to_string(&vitem);
932 assert_eq!(&vitem_s[..], ex_s);
934 let ex_s = "extern crate foo as bar;";
935 let vitem = string_to_item(ex_s.to_string()).unwrap();
936 let vitem_s = item_to_string(&vitem);
937 assert_eq!(&vitem_s[..], ex_s);
940 fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
941 let item = string_to_item(src.to_string()).unwrap();
943 struct PatIdentVisitor {
946 impl<'a> ::visit::Visitor<'a> for PatIdentVisitor {
947 fn visit_pat(&mut self, p: &'a ast::Pat) {
949 PatKind::Ident(_ , ref spannedident, _) => {
950 self.spans.push(spannedident.span.clone());
953 ::visit::walk_pat(self, p);
958 let mut v = PatIdentVisitor { spans: Vec::new() };
959 ::visit::walk_item(&mut v, &item);
963 #[test] fn span_of_self_arg_pat_idents_are_correct() {
965 let srcs = ["impl z { fn a (&self, &myarg: i32) {} }",
966 "impl z { fn a (&mut self, &myarg: i32) {} }",
967 "impl z { fn a (&'a self, &myarg: i32) {} }",
968 "impl z { fn a (self, &myarg: i32) {} }",
969 "impl z { fn a (self: Foo, &myarg: i32) {} }",
973 let spans = get_spans_of_pat_idents(src);
974 let Span{ lo, hi, .. } = spans[0];
975 assert!("self" == &src[lo.to_usize()..hi.to_usize()],
976 "\"{}\" != \"self\". src=\"{}\"",
977 &src[lo.to_usize()..hi.to_usize()], src)
981 #[test] fn parse_exprs () {
982 // just make sure that they parse....
983 string_to_expr("3 + 4".to_string());
984 string_to_expr("a::z.froob(b,&(987+3))".to_string());
987 #[test] fn attrs_fix_bug () {
988 string_to_item("pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
989 -> Result<Box<Writer>, String> {
992 (O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
996 fn wb() -> c_int { O_WRONLY as c_int }
998 let mut fflags: c_int = wb();
1002 #[test] fn crlf_doc_comments() {
1003 let sess = ParseSess::new();
1005 let name = "<source>".to_string();
1006 let source = "/// doc comment\r\nfn foo() {}".to_string();
1007 let item = parse_item_from_source_str(name.clone(), source, &sess)
1009 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
1010 assert_eq!(doc, "/// doc comment");
1012 let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
1013 let item = parse_item_from_source_str(name.clone(), source, &sess)
1015 let docs = item.attrs.iter().filter(|a| a.path == "doc")
1016 .map(|a| a.value_str().unwrap().to_string()).collect::<Vec<_>>();
1017 let b: &[_] = &["/// doc comment".to_string(), "/// line 2".to_string()];
1018 assert_eq!(&docs[..], b);
1020 let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
1021 let item = parse_item_from_source_str(name, source, &sess).unwrap().unwrap();
1022 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
1023 assert_eq!(doc, "/** doc comment\n * with CRLF */");
1028 let sess = ParseSess::new();
1029 let expr = parse::parse_expr_from_source_str("foo".to_string(),
1030 "foo!( fn main() { body } )".to_string(), &sess).unwrap();
1032 let tts: Vec<_> = match expr.node {
1033 ast::ExprKind::Mac(ref mac) => mac.node.stream().trees().collect(),
1034 _ => panic!("not a macro"),
1037 let span = tts.iter().rev().next().unwrap().span();
1039 match sess.codemap().span_to_snippet(span) {
1040 Ok(s) => assert_eq!(&s[..], "{ body }"),
1041 Err(_) => panic!("could not get snippet"),