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// re2rust $INPUT -o $OUTPUT
// Expect a null-terminated string.
fn lex(s: &[u8]) -> isize {
let (mut cur, mut mar) = (0, 0);
let lim = s.len() - 1; // null-terminator not included
let mut count = 0;
'lex: loop {/*!re2c
re2c:define:YYCTYPE = u8;
re2c:define:YYPEEK = "*s.get_unchecked(cur)";
re2c:define:YYSKIP = "cur += 1;";
re2c:define:YYBACKUP = "mar = cur;";
re2c:define:YYRESTORE = "cur = mar;";
re2c:define:YYLESSTHAN = "cur >= lim";
re2c:yyfill:enable = 0;
re2c:eof = 0;
str = ['] ([^'\\] | [\\][^])* ['];
* { return -1; }
$ { return count; }
str { count += 1; continue 'lex; }
[ ]+ { continue 'lex; }
*/}
}
fn main() {
assert_eq!(lex(b"\0"), 0);
assert_eq!(lex(b"'qu\0tes' 'are' 'fine: \\'' \0"), 3);
assert_eq!(lex(b"'unterminated\\'\0"), -1);
}