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View File Name :
parse_u32_conditions.re
//go:generate re2go -c $INPUT -o $OUTPUT -i package main import "errors" var ( eSyntax = errors.New("syntax error") eOverflow = errors.New("overflow error") ) /*!conditions:re2c*/ const u32Limit uint64 = 1<<32 func parse_u32(str string) (uint32, error) { var cur, mar int result := uint64(0) cond := yycinit add := func(base uint64, offset byte) { result = result * base + uint64(str[cur-1] - offset) if result >= u32Limit { result = u32Limit } } /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCTYPE = byte; re2c:define:YYPEEK = "str[cur]"; re2c:define:YYSKIP = "cur += 1"; re2c:define:YYSHIFT = "cur += @@{shift}"; re2c:define:YYBACKUP = "mar = cur"; re2c:define:YYRESTORE = "cur = mar"; re2c:define:YYGETCONDITION = "cond"; re2c:define:YYSETCONDITION = "cond = @@"; <*> * { return 0, eSyntax }
'0b' / [01] :=> bin
"0" :=> oct
"" / [1-9] :=> dec
'0x' / [0-9a-fA-F] :=> hex
"\x00" { if result < u32Limit { return uint32(result), nil } else { return 0, eOverflow } }
[01] { add(2, '0'); goto yyc_bin }
[0-7] { add(8, '0'); goto yyc_oct }
[0-9] { add(10, '0'); goto yyc_dec }
[0-9] { add(16, '0'); goto yyc_hex }
[a-f] { add(16, 'a'-10); goto yyc_hex }
[A-F] { add(16, 'A'-10); goto yyc_hex } */ } func main() { test := func(num uint32, str string, err error) { if n, e := parse_u32(str); !(n == num && e == err) { panic("error") } } test(1234567890, "1234567890\000", nil) test(13, "0b1101\000", nil) test(0x7fe, "0x007Fe\000", nil) test(0644, "0644\000", nil) test(0, "9999999999\000", eOverflow) test(0, "123??\000", eSyntax) }