Current File : //usr/share/doc/re2c/examples/go/submatch/03_posix.go
// Code generated by re2c, DO NOT EDIT.
//line "go/submatch/03_posix.re":1
//go:generate re2go $INPUT -o $OUTPUT
package main
import "reflect"
// Maximum number of capturing groups among all rules.
//line "go/submatch/03_posix.go":10
var YYMAXNMATCH int = 4
//line "go/submatch/03_posix.re":7
type SemVer struct { major, minor, patch int }
func s2n(s string) int { // convert pre-parsed string to a number
n := 0
for _, c := range s { n = n*10 + int(c-'0') }
return n
}
func parse(str string) *SemVer {
var cur, mar int
// Allocate memory for capturing parentheses (twice the number of groups).
yypmatch := make([]int, YYMAXNMATCH*2)
var yynmatch int
// Autogenerated tag variables used by the lexer to track tag values.
//line "go/submatch/03_posix.go":32
var yyt1 int
var yyt2 int
var yyt3 int
var yyt4 int
var yyt5 int
//line "go/submatch/03_posix.re":25
//line "go/submatch/03_posix.go":42
{
var yych byte
yych = str[cur]
switch (yych) {
case '0','1','2','3','4','5','6','7','8','9':
yyt1 = cur
goto yy3
default:
goto yy1
}
yy1:
cur += 1
yy2:
//line "go/submatch/03_posix.re":54
{ return nil }
//line "go/submatch/03_posix.go":58
yy3:
cur += 1
mar = cur
yych = str[cur]
switch (yych) {
case '.':
goto yy4
case '0','1','2','3','4','5','6','7','8','9':
goto yy6
default:
goto yy2
}
yy4:
cur += 1
yych = str[cur]
switch (yych) {
case '0','1','2','3','4','5','6','7','8','9':
yyt2 = cur
goto yy7
default:
goto yy5
}
yy5:
cur = mar
goto yy2
yy6:
cur += 1
yych = str[cur]
switch (yych) {
case '.':
goto yy4
case '0','1','2','3','4','5','6','7','8','9':
goto yy6
default:
goto yy5
}
yy7:
cur += 1
yych = str[cur]
switch (yych) {
case 0x00:
yyt3 = cur
yyt4 = -1
yyt5 = -1
goto yy8
case '.':
yyt3 = cur
yyt5 = cur
goto yy9
case '0','1','2','3','4','5','6','7','8','9':
goto yy7
default:
goto yy5
}
yy8:
cur += 1
yynmatch = 4
yypmatch[2] = yyt1
yypmatch[4] = yyt2
yypmatch[5] = yyt3
yypmatch[6] = yyt5
yypmatch[7] = yyt4
yypmatch[0] = yyt1
yypmatch[1] = cur
yypmatch[3] = yyt2
yypmatch[3] += -1
//line "go/submatch/03_posix.re":41
{
// `yynmatch` is the number of capturing groups
if yynmatch != 4 { panic("expected 4 submatch groups") }
// Even `yypmatch` values are for opening parentheses, odd values
// are for closing parentheses, the first group is the whole match.
major := s2n(str[yypmatch[2]:yypmatch[3]])
minor := s2n(str[yypmatch[4]:yypmatch[5]])
patch := 0
if yypmatch[6] != -1 { patch = s2n(str[yypmatch[6]+1:yypmatch[7]]) }
return &SemVer{major, minor, patch}
}
//line "go/submatch/03_posix.go":139
yy9:
cur += 1
yych = str[cur]
if (yych <= 0x00) {
goto yy5
}
goto yy11
yy10:
cur += 1
yych = str[cur]
yy11:
switch (yych) {
case 0x00:
yyt4 = cur
goto yy8
case '0','1','2','3','4','5','6','7','8','9':
goto yy10
default:
goto yy5
}
}
//line "go/submatch/03_posix.re":55
}
func main() {
assert_eq := func(x, y *SemVer) {
if !reflect.DeepEqual(x, y) { panic("error") }
}
assert_eq(parse("23.34\000"), &SemVer{23, 34, 0})
assert_eq(parse("1.2.9999\000"), &SemVer{1, 2, 9999})
assert_eq(parse("1.a\000"), nil)
}
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