%PDF-
%PDF-
Mini Shell
Mini Shell
// Code generated by re2c, DO NOT EDIT.
//go:generate re2go -c $INPUT -o $OUTPUT -i
package main
import "errors"
var (
eSyntax = errors.New("syntax error")
eOverflow = errors.New("overflow error")
)
const (
yycinit = iota
yycbin
yycdec
yychex
yycoct
)
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
}
}
{
var yych byte
switch (cond) {
case yycinit:
goto yyc_init
case yycbin:
goto yyc_bin
case yycdec:
goto yyc_dec
case yychex:
goto yyc_hex
case yycoct:
goto yyc_oct
}
/* *********************************** */
yyc_init:
yych = str[cur]
switch (yych) {
case '0':
goto yy2
case '1','2','3','4','5','6','7','8','9':
goto yy4
default:
goto yy1
}
yy1:
cur += 1
{ return 0, eSyntax }
yy2:
cur += 1
mar = cur
yych = str[cur]
switch (yych) {
case 'B':
fallthrough
case 'b':
goto yy5
case 'X':
fallthrough
case 'x':
goto yy7
default:
goto yy3
}
yy3:
cond = yycoct
goto yyc_oct
yy4:
cur += 1
cur += -1
cond = yycdec
goto yyc_dec
yy5:
cur += 1
yych = str[cur]
switch (yych) {
case '0','1':
goto yy8
default:
goto yy6
}
yy6:
cur = mar
goto yy3
yy7:
cur += 1
yych = str[cur]
switch (yych) {
case '0','1','2','3','4','5','6','7','8','9':
fallthrough
case 'A','B','C','D','E','F':
fallthrough
case 'a','b','c','d','e','f':
goto yy9
default:
goto yy6
}
yy8:
cur += 1
cur += -1
cond = yycbin
goto yyc_bin
yy9:
cur += 1
cur += -1
cond = yychex
goto yyc_hex
/* *********************************** */
yyc_bin:
yych = str[cur]
switch (yych) {
case 0x00:
goto yy11
case '0','1':
goto yy13
default:
goto yy12
}
yy11:
cur += 1
{
if result < u32Limit {
return uint32(result), nil
} else {
return 0, eOverflow
}
}
yy12:
cur += 1
{ return 0, eSyntax }
yy13:
cur += 1
{ add(2, '0'); goto yyc_bin }
/* *********************************** */
yyc_dec:
yych = str[cur]
switch (yych) {
case 0x00:
goto yy15
case '0','1','2','3','4','5','6','7','8','9':
goto yy17
default:
goto yy16
}
yy15:
cur += 1
{
if result < u32Limit {
return uint32(result), nil
} else {
return 0, eOverflow
}
}
yy16:
cur += 1
{ return 0, eSyntax }
yy17:
cur += 1
{ add(10, '0'); goto yyc_dec }
/* *********************************** */
yyc_hex:
yych = str[cur]
switch (yych) {
case 0x00:
goto yy19
case '0','1','2','3','4','5','6','7','8','9':
goto yy21
case 'A','B','C','D','E','F':
goto yy22
case 'a','b','c','d','e','f':
goto yy23
default:
goto yy20
}
yy19:
cur += 1
{
if result < u32Limit {
return uint32(result), nil
} else {
return 0, eOverflow
}
}
yy20:
cur += 1
{ return 0, eSyntax }
yy21:
cur += 1
{ add(16, '0'); goto yyc_hex }
yy22:
cur += 1
{ add(16, 'A'-10); goto yyc_hex }
yy23:
cur += 1
{ add(16, 'a'-10); goto yyc_hex }
/* *********************************** */
yyc_oct:
yych = str[cur]
switch (yych) {
case 0x00:
goto yy25
case '0','1','2','3','4','5','6','7':
goto yy27
default:
goto yy26
}
yy25:
cur += 1
{
if result < u32Limit {
return uint32(result), nil
} else {
return 0, eOverflow
}
}
yy26:
cur += 1
{ return 0, eSyntax }
yy27:
cur += 1
{ add(8, '0'); goto yyc_oct }
}
}
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)
}
Zerion Mini Shell 1.0