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Mini Shell
Mini Shell
/* 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);
}
Zerion Mini Shell 1.0