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::{self, Span, CodeMap, FileMap};
15 use errors::{Handler, ColorConfig, FatalError};
16 use parse::parser::Parser;
17 use parse::token::InternedString;
21 use std::cell::RefCell;
24 use std::path::{Path, PathBuf};
28 pub type PResult<T> = Result<T, FatalError>;
41 /// Info about a parsing session.
42 pub struct ParseSess {
43 pub span_diagnostic: Handler, // better be the same as the one in the reader!
44 /// Used to determine and report recursive mod inclusions
45 included_mod_stack: RefCell<Vec<PathBuf>>,
46 code_map: Rc<CodeMap>,
50 pub fn new() -> ParseSess {
51 let cm = Rc::new(CodeMap::new());
52 let handler = Handler::new(ColorConfig::Auto, None, true, false, cm.clone());
53 ParseSess::with_span_handler(handler, cm)
56 pub fn with_span_handler(handler: Handler, code_map: Rc<CodeMap>) -> ParseSess {
58 span_diagnostic: handler,
59 included_mod_stack: RefCell::new(vec![]),
64 pub fn codemap(&self) -> &CodeMap {
69 // a bunch of utility functions of the form parse_<thing>_from_<source>
70 // where <thing> includes crate, expr, item, stmt, tts, and one that
71 // uses a HOF to parse anything, and <source> includes file and
74 pub fn parse_crate_from_file(
76 cfg: ast::CrateConfig,
79 panictry!(new_parser_from_file(sess, cfg, input).parse_crate_mod())
80 // why is there no p.abort_if_errors here?
83 pub fn parse_crate_attrs_from_file(
85 cfg: ast::CrateConfig,
87 ) -> Vec<ast::Attribute> {
88 // FIXME: maybe_aborted?
89 panictry!(new_parser_from_file(sess, cfg, input).parse_inner_attributes())
92 pub fn parse_crate_from_source_str(name: String,
94 cfg: ast::CrateConfig,
97 let mut p = new_parser_from_source_str(sess,
101 maybe_aborted(panictry!(p.parse_crate_mod()),p)
104 pub fn parse_crate_attrs_from_source_str(name: String,
106 cfg: ast::CrateConfig,
108 -> Vec<ast::Attribute> {
109 let mut p = new_parser_from_source_str(sess,
113 maybe_aborted(panictry!(p.parse_inner_attributes()), p)
116 pub fn parse_expr_from_source_str(name: String,
118 cfg: ast::CrateConfig,
121 let mut p = new_parser_from_source_str(sess, cfg, name, source);
122 maybe_aborted(panictry!(p.parse_expr()), p)
125 pub fn parse_item_from_source_str(name: String,
127 cfg: ast::CrateConfig,
129 -> Option<P<ast::Item>> {
130 let mut p = new_parser_from_source_str(sess, cfg, name, source);
131 maybe_aborted(panictry!(p.parse_item()), p)
134 pub fn parse_meta_from_source_str(name: String,
136 cfg: ast::CrateConfig,
138 -> P<ast::MetaItem> {
139 let mut p = new_parser_from_source_str(sess, cfg, name, source);
140 maybe_aborted(panictry!(p.parse_meta_item()), p)
143 pub fn parse_stmt_from_source_str(name: String,
145 cfg: ast::CrateConfig,
147 -> Option<P<ast::Stmt>> {
148 let mut p = new_parser_from_source_str(
154 maybe_aborted(panictry!(p.parse_stmt()), p)
157 // Warning: This parses with quote_depth > 0, which is not the default.
158 pub fn parse_tts_from_source_str(name: String,
160 cfg: ast::CrateConfig,
162 -> Vec<ast::TokenTree> {
163 let mut p = new_parser_from_source_str(
170 // right now this is re-creating the token trees from ... token trees.
171 maybe_aborted(panictry!(p.parse_all_token_trees()),p)
174 // Create a new parser from a source string
175 pub fn new_parser_from_source_str<'a>(sess: &'a ParseSess,
176 cfg: ast::CrateConfig,
180 filemap_to_parser(sess, sess.codemap().new_filemap(name, source), cfg)
183 /// Create a new parser, handling errors as appropriate
184 /// if the file doesn't exist
185 pub fn new_parser_from_file<'a>(sess: &'a ParseSess,
186 cfg: ast::CrateConfig,
187 path: &Path) -> Parser<'a> {
188 filemap_to_parser(sess, file_to_filemap(sess, path, None), cfg)
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 pub fn new_sub_parser_from_file<'a>(sess: &'a ParseSess,
195 cfg: ast::CrateConfig,
197 owns_directory: bool,
198 module_name: Option<String>,
199 sp: Span) -> Parser<'a> {
200 let mut p = filemap_to_parser(sess, file_to_filemap(sess, path, Some(sp)), cfg);
201 p.owns_directory = owns_directory;
202 p.root_module_name = module_name;
206 /// Given a filemap and config, return a parser
207 pub fn filemap_to_parser<'a>(sess: &'a ParseSess,
208 filemap: Rc<FileMap>,
209 cfg: ast::CrateConfig) -> Parser<'a> {
210 let end_pos = filemap.end_pos;
211 let mut parser = tts_to_parser(sess, filemap_to_tts(sess, filemap), cfg);
213 if parser.token == token::Eof && parser.span == codemap::DUMMY_SP {
214 parser.span = codemap::mk_sp(end_pos, end_pos);
220 // must preserve old name for now, because quote! from the *existing*
221 // compiler expands into it
222 pub fn new_parser_from_tts<'a>(sess: &'a ParseSess,
223 cfg: ast::CrateConfig,
224 tts: Vec<ast::TokenTree>) -> Parser<'a> {
225 tts_to_parser(sess, tts, cfg)
231 /// Given a session and a path and an optional span (for error reporting),
232 /// add the path to the session's codemap and return the new filemap.
233 fn file_to_filemap(sess: &ParseSess, path: &Path, spanopt: Option<Span>)
235 match sess.codemap().load_file(path) {
236 Ok(filemap) => filemap,
238 let msg = format!("couldn't read {:?}: {}", path.display(), e);
240 Some(sp) => panic!(sess.span_diagnostic.span_fatal(sp, &msg)),
241 None => panic!(sess.span_diagnostic.fatal(&msg))
247 /// Given a filemap, produce a sequence of token-trees
248 pub fn filemap_to_tts(sess: &ParseSess, filemap: Rc<FileMap>)
249 -> Vec<ast::TokenTree> {
250 // it appears to me that the cfg doesn't matter here... indeed,
251 // parsing tt's probably shouldn't require a parser at all.
252 let cfg = Vec::new();
253 let srdr = lexer::StringReader::new(&sess.span_diagnostic, filemap);
254 let mut p1 = Parser::new(sess, cfg, Box::new(srdr));
255 panictry!(p1.parse_all_token_trees())
258 /// Given tts and cfg, produce a parser
259 pub fn tts_to_parser<'a>(sess: &'a ParseSess,
260 tts: Vec<ast::TokenTree>,
261 cfg: ast::CrateConfig) -> Parser<'a> {
262 let trdr = lexer::new_tt_reader(&sess.span_diagnostic, None, None, tts);
263 let mut p = Parser::new(sess, cfg, Box::new(trdr));
264 panictry!(p.check_unknown_macro_variable());
268 /// Abort if necessary
269 pub fn maybe_aborted<T>(result: T, p: Parser) -> T {
274 /// Parse a string representing a character literal into its final form.
275 /// Rather than just accepting/rejecting a given literal, unescapes it as
276 /// well. Can take any slice prefixed by a character escape. Returns the
277 /// character and the number of characters consumed.
278 pub fn char_lit(lit: &str) -> (char, isize) {
281 let mut chars = lit.chars();
282 let c = match (chars.next(), chars.next()) {
283 (Some(c), None) if c != '\\' => return (c, 1),
284 (Some('\\'), Some(c)) => match c {
294 _ => panic!("lexer accepted invalid char escape `{}`", lit)
298 Some(x) => return (x, 2),
302 let msg = format!("lexer should have rejected a bad character escape {}", lit);
305 fn esc(len: usize, lit: &str) -> Option<(char, isize)> {
306 u32::from_str_radix(&lit[2..len], 16).ok()
307 .and_then(char::from_u32)
308 .map(|x| (x, len as isize))
311 let unicode_escape = || -> Option<(char, isize)> {
312 if lit.as_bytes()[2] == b'{' {
313 let idx = lit.find('}').expect(msg2);
314 let subslice = &lit[3..idx];
315 u32::from_str_radix(subslice, 16).ok()
316 .and_then(char::from_u32)
317 .map(|x| (x, subslice.chars().count() as isize + 4))
324 return match lit.as_bytes()[1] as char {
325 'x' | 'X' => esc(4, lit),
326 'u' => unicode_escape(),
332 /// Parse a string representing a string literal into its final form. Does
334 pub fn str_lit(lit: &str) -> String {
335 debug!("parse_str_lit: given {}", lit.escape_default());
336 let mut res = String::with_capacity(lit.len());
338 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
339 let error = |i| format!("lexer should have rejected {} at {}", lit, i);
341 /// Eat everything up to a non-whitespace
342 fn eat<'a>(it: &mut iter::Peekable<str::CharIndices<'a>>) {
344 match it.peek().map(|x| x.1) {
345 Some(' ') | Some('\n') | Some('\r') | Some('\t') => {
353 let mut chars = lit.char_indices().peekable();
359 let ch = chars.peek().unwrap_or_else(|| {
360 panic!("{}", error(i))
365 } else if ch == '\r' {
367 let ch = chars.peek().unwrap_or_else(|| {
368 panic!("{}", error(i))
372 panic!("lexer accepted bare CR");
376 // otherwise, a normal escape
377 let (c, n) = char_lit(&lit[i..]);
378 for _ in 0..n - 1 { // we don't need to move past the first \
385 let ch = chars.peek().unwrap_or_else(|| {
386 panic!("{}", error(i))
390 panic!("lexer accepted bare CR");
402 res.shrink_to_fit(); // probably not going to do anything, unless there was an escape.
403 debug!("parse_str_lit: returning {}", res);
407 /// Parse a string representing a raw string literal into its final form. The
408 /// only operation this does is convert embedded CRLF into a single LF.
409 pub fn raw_str_lit(lit: &str) -> String {
410 debug!("raw_str_lit: given {}", lit.escape_default());
411 let mut res = String::with_capacity(lit.len());
413 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
414 let mut chars = lit.chars().peekable();
419 if *chars.peek().unwrap() != '\n' {
420 panic!("lexer accepted bare CR");
436 // check if `s` looks like i32 or u1234 etc.
437 fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
439 first_chars.contains(&char_at(s, 0)) &&
440 s[1..].chars().all(|c| '0' <= c && c <= '9')
443 fn filtered_float_lit(data: token::InternedString, suffix: Option<&str>,
444 sd: &Handler, sp: Span) -> ast::Lit_ {
445 debug!("filtered_float_lit: {}, {:?}", data, suffix);
446 match suffix.as_ref().map(|s| &**s) {
447 Some("f32") => ast::LitFloat(data, ast::TyF32),
448 Some("f64") => ast::LitFloat(data, ast::TyF64),
450 if suf.len() >= 2 && looks_like_width_suffix(&['f'], suf) {
451 // if it looks like a width, lets try to be helpful.
452 sd.span_err(sp, &format!("invalid width `{}` for float literal", &suf[1..]));
453 sd.fileline_help(sp, "valid widths are 32 and 64");
455 sd.span_err(sp, &format!("invalid suffix `{}` for float literal", suf));
456 sd.fileline_help(sp, "valid suffixes are `f32` and `f64`");
459 ast::LitFloatUnsuffixed(data)
461 None => ast::LitFloatUnsuffixed(data)
464 pub fn float_lit(s: &str, suffix: Option<InternedString>,
465 sd: &Handler, sp: Span) -> ast::Lit_ {
466 debug!("float_lit: {:?}, {:?}", s, suffix);
467 // FIXME #2252: bounds checking float literals is deferred until trans
468 let s = s.chars().filter(|&c| c != '_').collect::<String>();
469 let data = token::intern_and_get_ident(&s);
470 filtered_float_lit(data, suffix.as_ref().map(|s| &**s), sd, sp)
473 /// Parse a string representing a byte literal into its final form. Similar to `char_lit`
474 pub fn byte_lit(lit: &str) -> (u8, usize) {
475 let err = |i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
478 (lit.as_bytes()[0], 1)
480 assert!(lit.as_bytes()[0] == b'\\', err(0));
481 let b = match lit.as_bytes()[1] {
490 match u64::from_str_radix(&lit[2..4], 16).ok() {
497 None => panic!(err(3))
505 pub fn byte_str_lit(lit: &str) -> Rc<Vec<u8>> {
506 let mut res = Vec::with_capacity(lit.len());
508 // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
509 let error = |i| format!("lexer should have rejected {} at {}", lit, i);
511 /// Eat everything up to a non-whitespace
512 fn eat<'a, I: Iterator<Item=(usize, u8)>>(it: &mut iter::Peekable<I>) {
514 match it.peek().map(|x| x.1) {
515 Some(b' ') | Some(b'\n') | Some(b'\r') | Some(b'\t') => {
523 // byte string literals *must* be ASCII, but the escapes don't have to be
524 let mut chars = lit.bytes().enumerate().peekable();
527 Some((i, b'\\')) => {
529 match chars.peek().expect(&em).1 {
530 b'\n' => eat(&mut chars),
533 if chars.peek().expect(&em).1 != b'\n' {
534 panic!("lexer accepted bare CR");
539 // otherwise, a normal escape
540 let (c, n) = byte_lit(&lit[i..]);
541 // we don't need to move past the first \
549 Some((i, b'\r')) => {
551 if chars.peek().expect(&em).1 != b'\n' {
552 panic!("lexer accepted bare CR");
557 Some((_, c)) => res.push(c),
565 pub fn integer_lit(s: &str,
566 suffix: Option<InternedString>,
570 // s can only be ascii, byte indexing is fine
572 let s2 = s.chars().filter(|&c| c != '_').collect::<String>();
575 debug!("integer_lit: {}, {:?}", s, suffix);
579 let mut ty = ast::UnsuffixedIntLit(ast::Plus);
581 if char_at(s, 0) == '0' && s.len() > 1 {
582 match char_at(s, 1) {
590 // 1f64 and 2f32 etc. are valid float literals.
591 if let Some(ref suf) = suffix {
592 if looks_like_width_suffix(&['f'], suf) {
594 16 => sd.span_err(sp, "hexadecimal float literal is not supported"),
595 8 => sd.span_err(sp, "octal float literal is not supported"),
596 2 => sd.span_err(sp, "binary float literal is not supported"),
599 let ident = token::intern_and_get_ident(&*s);
600 return filtered_float_lit(ident, Some(&**suf), sd, sp)
608 if let Some(ref suf) = suffix {
609 if suf.is_empty() { sd.span_bug(sp, "found empty literal suffix in Some")}
611 "isize" => ast::SignedIntLit(ast::TyIs, ast::Plus),
612 "i8" => ast::SignedIntLit(ast::TyI8, ast::Plus),
613 "i16" => ast::SignedIntLit(ast::TyI16, ast::Plus),
614 "i32" => ast::SignedIntLit(ast::TyI32, ast::Plus),
615 "i64" => ast::SignedIntLit(ast::TyI64, ast::Plus),
616 "usize" => ast::UnsignedIntLit(ast::TyUs),
617 "u8" => ast::UnsignedIntLit(ast::TyU8),
618 "u16" => ast::UnsignedIntLit(ast::TyU16),
619 "u32" => ast::UnsignedIntLit(ast::TyU32),
620 "u64" => ast::UnsignedIntLit(ast::TyU64),
622 // i<digits> and u<digits> look like widths, so lets
623 // give an error message along those lines
624 if looks_like_width_suffix(&['i', 'u'], suf) {
625 sd.span_err(sp, &format!("invalid width `{}` for integer literal",
627 sd.fileline_help(sp, "valid widths are 8, 16, 32 and 64");
629 sd.span_err(sp, &format!("invalid suffix `{}` for numeric literal", suf));
630 sd.fileline_help(sp, "the suffix must be one of the integral types \
631 (`u32`, `isize`, etc)");
639 debug!("integer_lit: the type is {:?}, base {:?}, the new string is {:?}, the original \
640 string was {:?}, the original suffix was {:?}", ty, base, s, orig, suffix);
642 let res = match u64::from_str_radix(s, base).ok() {
645 // small bases are lexed as if they were base 10, e.g, the string
646 // might be `0b10201`. This will cause the conversion above to fail,
647 // but these cases have errors in the lexer: we don't want to emit
648 // two errors, and we especially don't want to emit this error since
649 // it isn't necessarily true.
650 let already_errored = base < 10 &&
651 s.chars().any(|c| c.to_digit(10).map_or(false, |d| d >= base));
653 if !already_errored {
654 sd.span_err(sp, "int literal is too large");
661 let sign = ast::Sign::new(res);
663 ast::SignedIntLit(t, _) => ast::LitInt(res, ast::SignedIntLit(t, sign)),
664 ast::UnsuffixedIntLit(_) => ast::LitInt(res, ast::UnsuffixedIntLit(sign)),
665 us@ast::UnsignedIntLit(_) => ast::LitInt(res, us)
673 use codemap::{Span, BytePos, Pos, Spanned, NO_EXPANSION};
674 use ast::{self, TokenTree};
676 use attr::{first_attr_value_str_by_name, AttrMetaMethods};
678 use parse::parser::Parser;
679 use parse::token::{str_to_ident};
680 use print::pprust::item_to_string;
682 use util::parser_testing::{string_to_tts, string_to_parser};
683 use util::parser_testing::{string_to_expr, string_to_item, string_to_stmt};
685 // produce a codemap::span
686 fn sp(a: u32, b: u32) -> Span {
687 Span {lo: BytePos(a), hi: BytePos(b), expn_id: NO_EXPANSION}
690 #[test] fn path_exprs_1() {
691 assert!(string_to_expr("a".to_string()) ==
693 id: ast::DUMMY_NODE_ID,
694 node: ast::ExprPath(None, ast::Path {
699 identifier: str_to_ident("a"),
700 parameters: ast::PathParameters::none(),
709 #[test] fn path_exprs_2 () {
710 assert!(string_to_expr("::a::b".to_string()) ==
712 id: ast::DUMMY_NODE_ID,
713 node: ast::ExprPath(None, ast::Path {
718 identifier: str_to_ident("a"),
719 parameters: ast::PathParameters::none(),
722 identifier: str_to_ident("b"),
723 parameters: ast::PathParameters::none(),
733 #[test] fn bad_path_expr_1() {
734 string_to_expr("::abc::def::return".to_string());
737 // check the token-tree-ization of macros
739 fn string_to_tts_macro () {
740 let tts = string_to_tts("macro_rules! zip (($a)=>($a))".to_string());
741 let tts: &[ast::TokenTree] = &tts[..];
743 match (tts.len(), tts.get(0), tts.get(1), tts.get(2), tts.get(3)) {
746 Some(&TokenTree::Token(_, token::Ident(name_macro_rules, token::Plain))),
747 Some(&TokenTree::Token(_, token::Not)),
748 Some(&TokenTree::Token(_, token::Ident(name_zip, token::Plain))),
749 Some(&TokenTree::Delimited(_, ref macro_delimed)),
751 if name_macro_rules.name.as_str() == "macro_rules"
752 && name_zip.name.as_str() == "zip" => {
753 let tts = ¯o_delimed.tts[..];
754 match (tts.len(), tts.get(0), tts.get(1), tts.get(2)) {
757 Some(&TokenTree::Delimited(_, ref first_delimed)),
758 Some(&TokenTree::Token(_, token::FatArrow)),
759 Some(&TokenTree::Delimited(_, ref second_delimed)),
761 if macro_delimed.delim == token::Paren => {
762 let tts = &first_delimed.tts[..];
763 match (tts.len(), tts.get(0), tts.get(1)) {
766 Some(&TokenTree::Token(_, token::Dollar)),
767 Some(&TokenTree::Token(_, token::Ident(ident, token::Plain))),
769 if first_delimed.delim == token::Paren
770 && ident.name.as_str() == "a" => {},
771 _ => panic!("value 3: {:?}", **first_delimed),
773 let tts = &second_delimed.tts[..];
774 match (tts.len(), tts.get(0), tts.get(1)) {
777 Some(&TokenTree::Token(_, token::Dollar)),
778 Some(&TokenTree::Token(_, token::Ident(ident, token::Plain))),
780 if second_delimed.delim == token::Paren
781 && ident.name.as_str() == "a" => {},
782 _ => panic!("value 4: {:?}", **second_delimed),
785 _ => panic!("value 2: {:?}", **macro_delimed),
788 _ => panic!("value: {:?}",tts),
793 fn string_to_tts_1() {
794 let tts = string_to_tts("fn a (b : i32) { b; }".to_string());
797 TokenTree::Token(sp(0, 2),
798 token::Ident(str_to_ident("fn"),
799 token::IdentStyle::Plain)),
800 TokenTree::Token(sp(3, 4),
801 token::Ident(str_to_ident("a"),
802 token::IdentStyle::Plain)),
803 TokenTree::Delimited(
805 Rc::new(ast::Delimited {
806 delim: token::DelimToken::Paren,
809 TokenTree::Token(sp(6, 7),
810 token::Ident(str_to_ident("b"),
811 token::IdentStyle::Plain)),
812 TokenTree::Token(sp(8, 9),
814 TokenTree::Token(sp(10, 13),
815 token::Ident(str_to_ident("i32"),
816 token::IdentStyle::Plain)),
818 close_span: sp(13, 14),
820 TokenTree::Delimited(
822 Rc::new(ast::Delimited {
823 delim: token::DelimToken::Brace,
824 open_span: sp(15, 16),
826 TokenTree::Token(sp(17, 18),
827 token::Ident(str_to_ident("b"),
828 token::IdentStyle::Plain)),
829 TokenTree::Token(sp(18, 19),
832 close_span: sp(20, 21),
836 assert_eq!(tts, expected);
839 #[test] fn ret_expr() {
840 assert!(string_to_expr("return d".to_string()) ==
842 id: ast::DUMMY_NODE_ID,
843 node:ast::ExprRet(Some(P(ast::Expr{
844 id: ast::DUMMY_NODE_ID,
845 node:ast::ExprPath(None, ast::Path{
850 identifier: str_to_ident("d"),
851 parameters: ast::PathParameters::none(),
863 #[test] fn parse_stmt_1 () {
864 assert!(string_to_stmt("b;".to_string()) ==
866 node: ast::StmtExpr(P(ast::Expr {
867 id: ast::DUMMY_NODE_ID,
868 node: ast::ExprPath(None, ast::Path {
873 identifier: str_to_ident("b"),
874 parameters: ast::PathParameters::none(),
885 fn parser_done(p: Parser){
886 assert_eq!(p.token.clone(), token::Eof);
889 #[test] fn parse_ident_pat () {
890 let sess = ParseSess::new();
891 let mut parser = string_to_parser(&sess, "b".to_string());
892 assert!(panictry!(parser.parse_pat())
894 id: ast::DUMMY_NODE_ID,
895 node: ast::PatIdent(ast::BindByValue(ast::MutImmutable),
896 Spanned{ span:sp(0, 1),
897 node: str_to_ident("b")
904 // check the contents of the tt manually:
905 #[test] fn parse_fundecl () {
906 // this test depends on the intern order of "fn" and "i32"
907 assert_eq!(string_to_item("fn a (b : i32) { b; }".to_string()),
909 P(ast::Item{ident:str_to_ident("a"),
911 id: ast::DUMMY_NODE_ID,
912 node: ast::ItemFn(P(ast::FnDecl {
913 inputs: vec!(ast::Arg{
914 ty: P(ast::Ty{id: ast::DUMMY_NODE_ID,
915 node: ast::TyPath(None, ast::Path{
922 parameters: ast::PathParameters::none(),
929 id: ast::DUMMY_NODE_ID,
931 ast::BindByValue(ast::MutImmutable),
934 node: str_to_ident("b")},
939 id: ast::DUMMY_NODE_ID
941 output: ast::DefaultReturn(sp(15, 15)),
944 ast::Unsafety::Normal,
945 ast::Constness::NotConst,
947 ast::Generics{ // no idea on either of these:
948 lifetimes: Vec::new(),
949 ty_params: P::empty(),
950 where_clause: ast::WhereClause {
951 id: ast::DUMMY_NODE_ID,
952 predicates: Vec::new(),
956 stmts: vec!(P(Spanned{
957 node: ast::StmtSemi(P(ast::Expr{
958 id: ast::DUMMY_NODE_ID,
959 node: ast::ExprPath(None,
969 ast::PathParameters::none(),
978 id: ast::DUMMY_NODE_ID,
979 rules: ast::DefaultBlock, // no idea
986 #[test] fn parse_use() {
987 let use_s = "use foo::bar::baz;";
988 let vitem = string_to_item(use_s.to_string()).unwrap();
989 let vitem_s = item_to_string(&*vitem);
990 assert_eq!(&vitem_s[..], use_s);
992 let use_s = "use foo::bar as baz;";
993 let vitem = string_to_item(use_s.to_string()).unwrap();
994 let vitem_s = item_to_string(&*vitem);
995 assert_eq!(&vitem_s[..], use_s);
998 #[test] fn parse_extern_crate() {
999 let ex_s = "extern crate foo;";
1000 let vitem = string_to_item(ex_s.to_string()).unwrap();
1001 let vitem_s = item_to_string(&*vitem);
1002 assert_eq!(&vitem_s[..], ex_s);
1004 let ex_s = "extern crate foo as bar;";
1005 let vitem = string_to_item(ex_s.to_string()).unwrap();
1006 let vitem_s = item_to_string(&*vitem);
1007 assert_eq!(&vitem_s[..], ex_s);
1010 fn get_spans_of_pat_idents(src: &str) -> Vec<Span> {
1011 let item = string_to_item(src.to_string()).unwrap();
1013 struct PatIdentVisitor {
1016 impl<'v> ::visit::Visitor<'v> for PatIdentVisitor {
1017 fn visit_pat(&mut self, p: &'v ast::Pat) {
1019 ast::PatIdent(_ , ref spannedident, _) => {
1020 self.spans.push(spannedident.span.clone());
1023 ::visit::walk_pat(self, p);
1028 let mut v = PatIdentVisitor { spans: Vec::new() };
1029 ::visit::walk_item(&mut v, &*item);
1033 #[test] fn span_of_self_arg_pat_idents_are_correct() {
1035 let srcs = ["impl z { fn a (&self, &myarg: i32) {} }",
1036 "impl z { fn a (&mut self, &myarg: i32) {} }",
1037 "impl z { fn a (&'a self, &myarg: i32) {} }",
1038 "impl z { fn a (self, &myarg: i32) {} }",
1039 "impl z { fn a (self: Foo, &myarg: i32) {} }",
1043 let spans = get_spans_of_pat_idents(src);
1044 let Span{ lo, hi, .. } = spans[0];
1045 assert!("self" == &src[lo.to_usize()..hi.to_usize()],
1046 "\"{}\" != \"self\". src=\"{}\"",
1047 &src[lo.to_usize()..hi.to_usize()], src)
1051 #[test] fn parse_exprs () {
1052 // just make sure that they parse....
1053 string_to_expr("3 + 4".to_string());
1054 string_to_expr("a::z.froob(b,&(987+3))".to_string());
1057 #[test] fn attrs_fix_bug () {
1058 string_to_item("pub fn mk_file_writer(path: &Path, flags: &[FileFlag])
1059 -> Result<Box<Writer>, String> {
1062 (O_WRONLY | libc::consts::os::extra::O_BINARY) as c_int
1066 fn wb() -> c_int { O_WRONLY as c_int }
1068 let mut fflags: c_int = wb();
1072 #[test] fn crlf_doc_comments() {
1073 let sess = ParseSess::new();
1075 let name = "<source>".to_string();
1076 let source = "/// doc comment\r\nfn foo() {}".to_string();
1077 let item = parse_item_from_source_str(name.clone(), source, Vec::new(), &sess).unwrap();
1078 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
1079 assert_eq!(&doc[..], "/// doc comment");
1081 let source = "/// doc comment\r\n/// line 2\r\nfn foo() {}".to_string();
1082 let item = parse_item_from_source_str(name.clone(), source, Vec::new(), &sess).unwrap();
1083 let docs = item.attrs.iter().filter(|a| &*a.name() == "doc")
1084 .map(|a| a.value_str().unwrap().to_string()).collect::<Vec<_>>();
1085 let b: &[_] = &["/// doc comment".to_string(), "/// line 2".to_string()];
1086 assert_eq!(&docs[..], b);
1088 let source = "/** doc comment\r\n * with CRLF */\r\nfn foo() {}".to_string();
1089 let item = parse_item_from_source_str(name, source, Vec::new(), &sess).unwrap();
1090 let doc = first_attr_value_str_by_name(&item.attrs, "doc").unwrap();
1091 assert_eq!(&doc[..], "/** doc comment\n * with CRLF */");
1096 let sess = ParseSess::new();
1097 let expr = parse::parse_expr_from_source_str("foo".to_string(),
1098 "foo!( fn main() { body } )".to_string(), vec![], &sess);
1100 let tts = match expr.node {
1101 ast::ExprMac(ref mac) => mac.node.tts.clone(),
1102 _ => panic!("not a macro"),
1105 let span = tts.iter().rev().next().unwrap().get_span();
1107 match sess.codemap().span_to_snippet(span) {
1108 Ok(s) => assert_eq!(&s[..], "{ body }"),
1109 Err(_) => panic!("could not get snippet"),