diff --git a/doc/rust.md b/doc/rust.md index 9ebb3384c61..d10238c1483 100644 --- a/doc/rust.md +++ b/doc/rust.md @@ -248,7 +248,7 @@ string_body : non_double_quote | '\x5c' [ '\x22' | common_escape ] ; common_escape : '\x5c' - | 'n' | 'r' | 't' + | 'n' | 'r' | 't' | '0' | 'x' hex_digit 2 | 'u' hex_digit 4 | 'U' hex_digit 8 ; diff --git a/src/libsyntax/parse/lexer.rs b/src/libsyntax/parse/lexer.rs index c267a673fce..0bc9e619274 100644 --- a/src/libsyntax/parse/lexer.rs +++ b/src/libsyntax/parse/lexer.rs @@ -699,6 +699,7 @@ fn next_token_inner(rdr: @mut StringReader) -> token::Token { '\\' => { c2 = '\\'; } '\'' => { c2 = '\''; } '"' => { c2 = '"'; } + '0' => { c2 = '\x00'; } 'x' => { c2 = scan_numeric_escape(rdr, 2u); } 'u' => { c2 = scan_numeric_escape(rdr, 4u); } 'U' => { c2 = scan_numeric_escape(rdr, 8u); } @@ -738,6 +739,7 @@ fn next_token_inner(rdr: @mut StringReader) -> token::Token { '\'' => accum_str.push_char('\''), '"' => accum_str.push_char('"'), '\n' => consume_whitespace(rdr), + '0' => accum_str.push_char('\x00'), 'x' => { accum_str.push_char(scan_numeric_escape(rdr, 2u)); } diff --git a/src/test/run-pass/nul-characters.rs b/src/test/run-pass/nul-characters.rs new file mode 100644 index 00000000000..2a301d0b0fd --- /dev/null +++ b/src/test/run-pass/nul-characters.rs @@ -0,0 +1,44 @@ +// Copyright 2013 The Rust Project Developers. See the COPYRIGHT +// file at the top-level directory of this distribution and at +// http://rust-lang.org/COPYRIGHT. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +pub fn main() +{ + let all_nuls1 = "\0\x00\u0000\U00000000"; + let all_nuls2 = "\U00000000\u0000\x00\0"; + let all_nuls3 = "\u0000\U00000000\x00\0"; + let all_nuls4 = "\x00\u0000\0\U00000000"; + + // sizes for two should suffice + assert_eq!(all_nuls1.len(), 4); + assert_eq!(all_nuls2.len(), 4); + + // string equality should pass between the strings + assert_eq!(all_nuls1, all_nuls2); + assert_eq!(all_nuls2, all_nuls3); + assert_eq!(all_nuls3, all_nuls4); + + // all extracted characters in all_nuls are equivalent to each other + for c1 in all_nuls1.iter() + { + for c2 in all_nuls1.iter() + { + assert_eq!(c1,c2); + } + } + + // testing equality between explicit character literals + assert_eq!('\0', '\x00'); + assert_eq!('\u0000', '\x00'); + assert_eq!('\u0000', '\U00000000'); + + // NUL characters should make a difference + assert!("Hello World" != "Hello \0World"); + assert!("Hello World" != "Hello World\0"); +}