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/* Generated by re2c */
// re2rust $INPUT -o $OUTPUT -c
const YYC_INIT: usize = 0;
const YYC_BIN: usize = 10;
const YYC_OCT: usize = 13;
const YYC_DEC: usize = 16;
const YYC_HEX: usize = 19;
const ERROR: u64 = std::u32::MAX as u64 + 1; // overflow
// Add digit with the given base, checking for overflow.
fn add(num: &mut u64, str: &[u8], cur: usize, offs: u8, base: u64) {
let digit = unsafe { str.get_unchecked(cur - 1) } - offs;
*num = std::cmp::min(*num * base + digit as u64, ERROR);
}
fn parse_u32(str: &[u8]) -> Option<u32> {
let (mut cur, mut mar) = (0, 0);
let mut cond = YYC_INIT;
let mut num = 0u64; // Store number in u64 to simplify overflow checks.
'lex: loop {
{
#[allow(unused_assignments)]
let mut yych : u8 = 0;
let mut yystate : usize = cond;
'yyl: loop {
match yystate {
0 => {
yych = unsafe {*str.get_unchecked(cur)};
cur += 1;
match yych {
0x30 => {
yystate = 2;
continue 'yyl;
}
0x31 ..= 0x39 => {
yystate = 4;
continue 'yyl;
}
_ => {
yystate = 1;
continue 'yyl;
}
}
}
1 => { return None; }
2 => {
mar = cur;
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x42 |
0x62 => {
cur += 1;
yystate = 5;
continue 'yyl;
}
0x58 |
0x78 => {
cur += 1;
yystate = 7;
continue 'yyl;
}
_ => {
yystate = 3;
continue 'yyl;
}
}
}
3 => {
cond = YYC_OCT;
yystate = YYC_OCT;
continue 'yyl;
}
4 => {
cur = (cur as isize + -1) as usize;
cond = YYC_DEC;
yystate = YYC_DEC;
continue 'yyl;
}
5 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x30 ..= 0x31 => {
cur += 1;
yystate = 8;
continue 'yyl;
}
_ => {
yystate = 6;
continue 'yyl;
}
}
}
6 => {
cur = mar;
yystate = 3;
continue 'yyl;
}
7 => {
yych = unsafe {*str.get_unchecked(cur)};
match yych {
0x30 ..= 0x39 |
0x41 ..= 0x46 |
0x61 ..= 0x66 => {
cur += 1;
yystate = 9;
continue 'yyl;
}
_ => {
yystate = 6;
continue 'yyl;
}
}
}
8 => {
cur = (cur as isize + -1) as usize;
cond = YYC_BIN;
yystate = YYC_BIN;
continue 'yyl;
}
9 => {
cur = (cur as isize + -1) as usize;
cond = YYC_HEX;
yystate = YYC_HEX;
continue 'yyl;
}
10 => {
yych = unsafe {*str.get_unchecked(cur)};
cur += 1;
match yych {
0x30 ..= 0x31 => {
yystate = 12;
continue 'yyl;
}
_ => {
yystate = 11;
continue 'yyl;
}
}
}
11 => {
return if num < ERROR { Some(num as u32) } else { None };
}
12 => { add(&mut num, str, cur, 48, 2); continue 'lex; }
13 => {
yych = unsafe {*str.get_unchecked(cur)};
cur += 1;
match yych {
0x30 ..= 0x37 => {
yystate = 15;
continue 'yyl;
}
_ => {
yystate = 14;
continue 'yyl;
}
}
}
14 => {
return if num < ERROR { Some(num as u32) } else { None };
}
15 => { add(&mut num, str, cur, 48, 8); continue 'lex; }
16 => {
yych = unsafe {*str.get_unchecked(cur)};
cur += 1;
match yych {
0x30 ..= 0x39 => {
yystate = 18;
continue 'yyl;
}
_ => {
yystate = 17;
continue 'yyl;
}
}
}
17 => {
return if num < ERROR { Some(num as u32) } else { None };
}
18 => { add(&mut num, str, cur, 48, 10); continue 'lex; }
19 => {
yych = unsafe {*str.get_unchecked(cur)};
cur += 1;
match yych {
0x30 ..= 0x39 => {
yystate = 21;
continue 'yyl;
}
0x41 ..= 0x46 => {
yystate = 22;
continue 'yyl;
}
0x61 ..= 0x66 => {
yystate = 23;
continue 'yyl;
}
_ => {
yystate = 20;
continue 'yyl;
}
}
}
20 => {
return if num < ERROR { Some(num as u32) } else { None };
}
21 => { add(&mut num, str, cur, 48, 16); continue 'lex; }
22 => { add(&mut num, str, cur, 55, 16); continue 'lex; }
23 => { add(&mut num, str, cur, 87, 16); continue 'lex; }
_ => {
panic!("internal lexer error")
}
}
}
}
}
}
fn main() {
assert_eq!(parse_u32(b"\0"), None);
assert_eq!(parse_u32(b"1234567890\0"), Some(1234567890));
assert_eq!(parse_u32(b"0b1101\0"), Some(13));
assert_eq!(parse_u32(b"0x7Fe\0"), Some(2046));
assert_eq!(parse_u32(b"0644\0"), Some(420));
assert_eq!(parse_u32(b"9999999999\0"), None);
}