1 // Copyright 2013 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 use ast::{self, Ident};
12 use source_map::FilePathMapping;
13 use parse::{ParseSess, PResult, source_file_to_stream};
14 use parse::{lexer, new_parser_from_source_str};
15 use parse::parser::Parser;
17 use tokenstream::TokenStream;
18 use std::iter::Peekable;
19 use std::path::PathBuf;
21 /// Map a string to tts, using a made-up filename:
22 pub fn string_to_stream(source_str: String) -> TokenStream {
23 let ps = ParseSess::new(FilePathMapping::empty());
24 source_file_to_stream(&ps, ps.source_map()
25 .new_source_file(PathBuf::from("bogofile").into(), source_str), None)
28 /// Map string to parser (via tts)
29 pub fn string_to_parser<'a>(ps: &'a ParseSess, source_str: String) -> Parser<'a> {
30 new_parser_from_source_str(ps, PathBuf::from("bogofile").into(), source_str)
33 fn with_error_checking_parse<'a, T, F>(s: String, ps: &'a ParseSess, f: F) -> T where
34 F: FnOnce(&mut Parser<'a>) -> PResult<'a, T>,
36 let mut p = string_to_parser(&ps, s);
37 let x = panictry!(f(&mut p));
42 /// Parse a string, return a crate.
43 pub fn string_to_crate (source_str : String) -> ast::Crate {
44 let ps = ParseSess::new(FilePathMapping::empty());
45 with_error_checking_parse(source_str, &ps, |p| {
50 /// Parse a string, return an expr
51 pub fn string_to_expr (source_str : String) -> P<ast::Expr> {
52 let ps = ParseSess::new(FilePathMapping::empty());
53 with_error_checking_parse(source_str, &ps, |p| {
58 /// Parse a string, return an item
59 pub fn string_to_item (source_str : String) -> Option<P<ast::Item>> {
60 let ps = ParseSess::new(FilePathMapping::empty());
61 with_error_checking_parse(source_str, &ps, |p| {
66 /// Parse a string, return a pat. Uses "irrefutable"... which doesn't
67 /// (currently) affect parsing.
68 pub fn string_to_pat(source_str: String) -> P<ast::Pat> {
69 let ps = ParseSess::new(FilePathMapping::empty());
70 with_error_checking_parse(source_str, &ps, |p| {
75 /// Convert a vector of strings to a vector of Ident's
76 pub fn strs_to_idents(ids: Vec<&str> ) -> Vec<Ident> {
77 ids.iter().map(|u| Ident::from_str(*u)).collect()
80 /// Does the given string match the pattern? whitespace in the first string
81 /// may be deleted or replaced with other whitespace to match the pattern.
82 /// This function is relatively Unicode-ignorant; fortunately, the careful design
83 /// of UTF-8 mitigates this ignorance. It doesn't do NKF-normalization(?).
84 pub fn matches_codepattern(a : &str, b : &str) -> bool {
85 let mut a_iter = a.chars().peekable();
86 let mut b_iter = b.chars().peekable();
89 let (a, b) = match (a_iter.peek(), b_iter.peek()) {
90 (None, None) => return true,
91 (None, _) => return false,
93 if is_pattern_whitespace(a) {
94 break // trailing whitespace check is out of loop for borrowck
99 (Some(&a), Some(&b)) => (a, b)
102 if is_pattern_whitespace(a) && is_pattern_whitespace(b) {
103 // skip whitespace for a and b
104 scan_for_non_ws_or_end(&mut a_iter);
105 scan_for_non_ws_or_end(&mut b_iter);
106 } else if is_pattern_whitespace(a) {
107 // skip whitespace for a
108 scan_for_non_ws_or_end(&mut a_iter);
117 // check if a has *only* trailing whitespace
118 a_iter.all(is_pattern_whitespace)
121 /// Advances the given peekable `Iterator` until it reaches a non-whitespace character
122 fn scan_for_non_ws_or_end<I: Iterator<Item= char>>(iter: &mut Peekable<I>) {
123 while lexer::is_pattern_whitespace(iter.peek().cloned()) {
128 pub fn is_pattern_whitespace(c: char) -> bool {
129 lexer::is_pattern_whitespace(Some(c))
138 assert_eq!(matches_codepattern("",""),true);
139 assert_eq!(matches_codepattern("","a"),false);
140 assert_eq!(matches_codepattern("a",""),false);
141 assert_eq!(matches_codepattern("a","a"),true);
142 assert_eq!(matches_codepattern("a b","a \n\t\r b"),true);
143 assert_eq!(matches_codepattern("a b ","a \n\t\r b"),true);
144 assert_eq!(matches_codepattern("a b","a \n\t\r b "),false);
145 assert_eq!(matches_codepattern("a b","a b"),true);
146 assert_eq!(matches_codepattern("ab","a b"),false);
147 assert_eq!(matches_codepattern("a b","ab"),true);
148 assert_eq!(matches_codepattern(" a b","ab"),true);
152 fn pattern_whitespace() {
153 assert_eq!(matches_codepattern("","\x0C"), false);
154 assert_eq!(matches_codepattern("a b ","a \u{0085}\n\t\r b"),true);
155 assert_eq!(matches_codepattern("a b","a \u{0085}\n\t\r b "),false);
159 fn non_pattern_whitespace() {
160 // These have the property 'White_Space' but not 'Pattern_White_Space'
161 assert_eq!(matches_codepattern("a b","a\u{2002}b"), false);
162 assert_eq!(matches_codepattern("a b","a\u{2002}b"), false);
163 assert_eq!(matches_codepattern("\u{205F}a b","ab"), false);
164 assert_eq!(matches_codepattern("a \u{3000}b","ab"), false);