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utils.go
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68 lines (58 loc) · 1.11 KB
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package parsecmd
import (
"regexp"
"strconv"
)
var numbers = regexp.MustCompile("[0-9]+")
func numericLessThan(a, b string) bool {
aLen, bLen := len(a), len(b)
minLen := aLen
if bLen < minLen {
minLen = bLen
}
if minLen == 0 {
if aLen == 0 {
return bLen != 0
}
return false
}
i := 0
for ; i < minLen && a[i] == b[i]; i++ {
}
if i == minLen {
if aLen == bLen {
return false
}
if aLen == minLen {
return true
}
return false
}
a, b = a[i:], b[i:]
aNos, bNos := numbers.FindAllStringIndex(a, 1), numbers.FindAllStringIndex(b, 1)
if len(aNos) == 1 && aNos[0][0] == 0 &&
len(bNos) == 1 && bNos[0][0] == 0 {
aNum, err := strconv.Atoi(a[:aNos[0][1]])
if err != nil {
return a < b
}
bNum, err := strconv.Atoi(b[:bNos[0][1]])
if err != nil {
return a < b
}
if aNum != bNum {
return aNum < bNum
}
}
return a < b
}
type naturalStrings []string
func (v naturalStrings) Len() int {
return len(v)
}
func (v naturalStrings) Less(i, j int) bool {
return !numericLessThan(v[i], v[j]) // desc order
}
func (v naturalStrings) Swap(i, j int) {
v[i], v[j] = v[j], v[i]
}