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Added support for a \0 escape sequence.

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This commit adds support for `\0` escapes in character and string literals.

Since `\0` is equivalent to `\x00`, this is a direct translation to the latter
escape sequence. Future builds will be able to compile using `\0` directly.

Also updated the grammar specification and added a test for NUL characters.
This commit is contained in:
Daniel Rosenwasser 2013-09-16 22:38:53 -04:00
parent 4dc3a97698
commit 604667fa82
3 changed files with 47 additions and 1 deletions
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2
src/libsyntax/parse/lexer.rs
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@ -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));
}