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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); }