glob/match/prefix_suffix.go

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package match
import (
"fmt"
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"strings"
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)
type PrefixSuffix struct {
Prefix, Suffix string
}
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func (self PrefixSuffix) Kind() Kind {
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return KindPrefixSuffix
}
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func (self PrefixSuffix) Index(s string) (int, []int) {
prefixIdx := strings.Index(s, self.Prefix)
if prefixIdx == -1 {
return -1, nil
}
var segments []int
for sub := s[prefixIdx:]; ; {
suffixIdx := strings.LastIndex(sub, self.Suffix)
if suffixIdx == -1 {
break
}
segments = append(segments, suffixIdx+len(self.Suffix))
sub = s[:suffixIdx]
}
segLen := len(segments)
if segLen == 0 {
return -1, nil
}
resp := make([]int, segLen)
for i, s := range segments {
resp[segLen-i-1] = s
}
return prefixIdx, resp
}
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func (self PrefixSuffix) Len() int {
return -1
}
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func (self PrefixSuffix) Search(s string) (i int, l int, ok bool) {
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if self.Match(s) {
return 0, len(s), true
}
return
}
func (self PrefixSuffix) Match(s string) bool {
return strings.HasPrefix(s, self.Prefix) && strings.HasSuffix(s, self.Suffix)
}
func (self PrefixSuffix) String() string {
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return fmt.Sprintf("<prefix_suffix:[%s,%s]>", self.Prefix, self.Suffix)
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}