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package pkgver
// See pkgtools/pkg_install/files/lib/dewey.c
import (
"netbsd.org/pkglint/textproc"
"strconv"
"strings"
)
func imax(a, b int) int {
if a > b {
return a
}
return b
}
func icmp(a, b int) int {
if a < b {
return -1
}
if a > b {
return 1
}
return 0
}
func Compare(left, right string) int {
lv := newVersion(left)
rv := newVersion(right)
m := imax(len(lv.v), len(rv.v))
for i := 0; i < m; i++ {
if c := icmp(lv.Place(i), rv.Place(i)); c != 0 {
return c
}
}
return icmp(lv.nb, rv.nb)
}
type version struct {
v []int
nb int
}
func newVersion(vstr string) *version {
v := new(version)
lex := textproc.NewLexer(strings.ToLower(vstr))
for !lex.EOF() {
switch {
case lex.TestByteSet(textproc.Digit):
num := lex.NextBytesSet(textproc.Digit)
n, _ := strconv.Atoi(num)
v.Add(n)
case lex.SkipByte('_') || lex.SkipByte('.'):
v.Add(0)
case lex.SkipString("alpha"):
v.Add(-3)
case lex.SkipString("beta"):
v.Add(-2)
case lex.SkipString("pre"):
v.Add(-1)
case lex.SkipString("rc"):
v.Add(-1)
case lex.SkipString("pl"):
v.Add(0)
case lex.SkipString("nb"):
num := lex.NextBytesSet(textproc.Digit)
v.nb, _ = strconv.Atoi(num)
case lex.TestByteSet(textproc.Lower):
v.Add(int(lex.Rest()[0] - 'a' + 1))
lex.Skip(1)
default:
lex.Skip(1)
}
}
return v
}
func (v *version) Add(i int) {
v.v = append(v.v, i)
}
func isdigit(b byte) bool {
return '0' <= b && b <= '9'
}
func (v *version) Place(i int) int {
if i < len(v.v) {
return v.v[i]
}
return 0
}
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