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/* Generated by re2c */ // re2rust $INPUT -o $OUTPUT // This example shows how to combine reusable re2c blocks: two blocks // ('colors' and 'fish') are merged into one. The 'salmon' rule occurs // in both blocks; the 'fish' block takes priority because it is used // earlier. Default rule * occurs in all three blocks; the local (not // inherited) definition takes priority. #[derive(Debug, PartialEq)] enum Ans { Color, Fish, Dunno } fn lex(str: &[u8]) -> Ans { let (mut cur, mut mar) = (0, 0); { #[allow(unused_assignments)] let mut yych : u8 = 0; let mut yystate : usize = 0; 'yyl: loop { match yystate { 0 => { yych = unsafe {*str.get_unchecked(cur)}; cur += 1; match yych { 0x65 => { yystate = 3; continue 'yyl; } 0x68 => { yystate = 4; continue 'yyl; } 0x6D => { yystate = 5; continue 'yyl; } 0x72 => { yystate = 6; continue 'yyl; } 0x73 => { yystate = 7; continue 'yyl; } _ => { yystate = 1; continue 'yyl; } } } 1 => { yystate = 2; continue 'yyl; } 2 => { return Ans::Dunno; } 3 => { mar = cur; yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x65 => { cur += 1; yystate = 8; continue 'yyl; } _ => { yystate = 2; continue 'yyl; } } } 4 => { mar = cur; yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x61 => { cur += 1; yystate = 10; continue 'yyl; } _ => { yystate = 2; continue 'yyl; } } } 5 => { mar = cur; yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x61 => { cur += 1; yystate = 11; continue 'yyl; } _ => { yystate = 2; continue 'yyl; } } } 6 => { mar = cur; yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x65 => { cur += 1; yystate = 12; continue 'yyl; } _ => { yystate = 2; continue 'yyl; } } } 7 => { mar = cur; yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x61 => { cur += 1; yystate = 13; continue 'yyl; } _ => { yystate = 2; continue 'yyl; } } } 8 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6C => { cur += 1; yystate = 14; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 9 => { cur = mar; yystate = 2; continue 'yyl; } 10 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x64 => { cur += 1; yystate = 15; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 11 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x67 => { cur += 1; yystate = 16; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 12 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x64 => { cur += 1; yystate = 17; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 13 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6C => { cur += 1; yystate = 18; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 14 => { return Ans::Fish; } 15 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x64 => { cur += 1; yystate = 19; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 16 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x65 => { cur += 1; yystate = 20; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 17 => { return Ans::Color; } 18 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6D => { cur += 1; yystate = 21; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 19 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6F => { cur += 1; yystate = 22; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 20 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6E => { cur += 1; yystate = 23; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 21 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6F => { cur += 1; yystate = 24; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 22 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x63 => { cur += 1; yystate = 25; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 23 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x74 => { cur += 1; yystate = 26; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 24 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6E => { cur += 1; yystate = 14; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 25 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x6B => { cur += 1; yystate = 14; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } 26 => { yych = unsafe {*str.get_unchecked(cur)}; match yych { 0x61 => { cur += 1; yystate = 17; continue 'yyl; } _ => { yystate = 9; continue 'yyl; } } } _ => { panic!("internal lexer error") } } } } } fn main() { assert_eq!(lex(b"salmon"), Ans::Fish); assert_eq!(lex(b"what?"), Ans::Dunno); }