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

View File Name : 01_sentinel.rs

/* Generated by re2c */
// re2rust $INPUT -o $OUTPUT

// Expect a null-terminated string.
fn lex(s: &[u8]) -> isize {
    let mut cur = 0;
    let mut count = 0;

    'lex: loop {
{
	#[allow(unused_assignments)]
	let mut yych : u8 = 0;
	let mut yystate : usize = 0;
	'yyl: loop {
		match yystate {
			0 => {
				yych = unsafe {*s.get_unchecked(cur)};
				cur += 1;
				match yych {
					0x00 => {
						yystate = 1;
						continue 'yyl;
					}
					0x20 => {
						yystate = 3;
						continue 'yyl;
					}
					0x61 ..= 0x7A => {
						yystate = 5;
						continue 'yyl;
					}
					_ => {
						yystate = 2;
						continue 'yyl;
					}
				}
			}
			1 => { return count; }
			2 => { return -1; }
			3 => {
				yych = unsafe {*s.get_unchecked(cur)};
				match yych {
					0x20 => {
						cur += 1;
						yystate = 3;
						continue 'yyl;
					}
					_ => {
						yystate = 4;
						continue 'yyl;
					}
				}
			}
			4 => { continue 'lex; }
			5 => {
				yych = unsafe {*s.get_unchecked(cur)};
				match yych {
					0x61 ..= 0x7A => {
						cur += 1;
						yystate = 5;
						continue 'yyl;
					}
					_ => {
						yystate = 6;
						continue 'yyl;
					}
				}
			}
			6 => { count += 1; continue 'lex; }
			_ => {
				panic!("internal lexer error")
			}
		}
	}
}
}
}

fn main() {
    assert_eq!(lex(b"\x00"), 0);
    assert_eq!(lex(b"one two three\x00"), 3);
    assert_eq!(lex(b"f0ur\x00"), -1);
}