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Mini Shell
Mini Shell
/* Generated by re2c */
// re2rust $INPUT -o $OUTPUT --input-encoding utf8
// This example supports multiple input encodings: UTF-8 and UTF-32.
// Both lexers are generated from the same rules block, and the use
// blocks add only encoding-specific configurations.
fn lex_utf8(str: &[u8]) -> Option<usize> {
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 {
0xE2 => {
yystate = 3;
continue 'yyl;
}
_ => {
yystate = 1;
continue 'yyl;
}
}
}
1 => {
yystate = 2;
continue 'yyl;
}
2 => { return None; }
3 => {
mar = cur;
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x88 => {
cur += 1;
yystate = 4;
continue 'yyl;
}
_ => {
yystate = 2;
continue 'yyl;
}
}
}
4 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x80 => {
cur += 1;
yystate = 6;
continue 'yyl;
}
_ => {
yystate = 5;
continue 'yyl;
}
}
}
5 => {
cur = mar;
yystate = 2;
continue 'yyl;
}
6 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x78 => {
cur += 1;
yystate = 7;
continue 'yyl;
}
_ => {
yystate = 5;
continue 'yyl;
}
}
}
7 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x20 => {
cur += 1;
yystate = 8;
continue 'yyl;
}
_ => {
yystate = 5;
continue 'yyl;
}
}
}
8 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0xE2 => {
cur += 1;
yystate = 9;
continue 'yyl;
}
_ => {
yystate = 5;
continue 'yyl;
}
}
}
9 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x88 => {
cur += 1;
yystate = 10;
continue 'yyl;
}
_ => {
yystate = 5;
continue 'yyl;
}
}
}
10 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x83 => {
cur += 1;
yystate = 11;
continue 'yyl;
}
_ => {
yystate = 5;
continue 'yyl;
}
}
}
11 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x79 => {
cur += 1;
yystate = 12;
continue 'yyl;
}
_ => {
yystate = 5;
continue 'yyl;
}
}
}
12 => { return Some(cur); }
_ => {
panic!("internal lexer error")
}
}
}
}
}
fn lex_utf32(str: &[u32]) -> Option<usize> {
let (mut cur, mut mar) = (0, 0);
{
#[allow(unused_assignments)]
let mut yych : u32 = 0;
let mut yystate : usize = 0;
'yyl: loop {
match yystate {
0 => {
yych = unsafe {*str.get_unchecked(cur)};
cur += 1;
if yych == 0x00002200 {
yystate = 2;
continue 'yyl;
}
yystate = 1;
continue 'yyl;
}
1 => { return None; }
2 => {
mar = cur;
yych = unsafe {*str.get_unchecked(cur)};
if yych != 0x00000078 {
yystate = 1;
continue 'yyl;
}
cur += 1;
yych = unsafe {*str.get_unchecked(cur)};
if yych == 0x00000020 {
cur += 1;
yystate = 4;
continue 'yyl;
}
yystate = 3;
continue 'yyl;
}
3 => {
cur = mar;
yystate = 1;
continue 'yyl;
}
4 => {
yych = unsafe {*str.get_unchecked(cur)};
if yych != 0x00002203 {
yystate = 3;
continue 'yyl;
}
cur += 1;
yych = unsafe {*str.get_unchecked(cur)};
if yych != 0x00000079 {
yystate = 3;
continue 'yyl;
}
cur += 1;
{ return Some(cur); }
}
_ => {
panic!("internal lexer error")
}
}
}
}
}
fn main() {
let s8 = vec![0xe2, 0x88, 0x80, 0x78, 0x20, 0xe2, 0x88, 0x83, 0x79];
assert_eq!(lex_utf8(&s8), Some(s8.len()));
let s32 = vec![0x2200, 0x78, 0x20, 0x2203, 0x79];
assert_eq!(lex_utf32(&s32), Some(s32.len()));
}
Zerion Mini Shell 1.0