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Dir : ~/usr/share/doc/re2c/examples/rust/eof/

View File Name : 03_eof_rule.re

// 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);
}