4c3cd4c9e3
Because it's literally ten times faster: benchmark old ns/op new ns/op delta BenchmarkMatch-8 13842 1200 -91.33% BenchmarkMatchCached-8 139 147 +5.76% benchmark old allocs new allocs delta BenchmarkMatch-8 0 0 +0.00% BenchmarkMatchCached-8 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkMatch-8 12 0 -100.00% BenchmarkMatchCached-8 0 0 +0.00%
63 lines
1.1 KiB
Go
63 lines
1.1 KiB
Go
package match
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import (
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"fmt"
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"strings"
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)
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type PrefixSuffix struct {
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Prefix, Suffix string
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}
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func NewPrefixSuffix(p, s string) PrefixSuffix {
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return PrefixSuffix{p, s}
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}
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func (self PrefixSuffix) Index(s string) (int, []int) {
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prefixIdx := strings.Index(s, self.Prefix)
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if prefixIdx == -1 {
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return -1, nil
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}
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suffixLen := len(self.Suffix)
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if suffixLen <= 0 {
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return prefixIdx, []int{len(s) - prefixIdx}
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}
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if (len(s) - prefixIdx) <= 0 {
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return -1, nil
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}
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segments := acquireSegments(len(s) - prefixIdx)
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for sub := s[prefixIdx:]; ; {
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suffixIdx := strings.LastIndex(sub, self.Suffix)
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if suffixIdx == -1 {
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break
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}
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segments = append(segments, suffixIdx+suffixLen)
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sub = sub[:suffixIdx]
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}
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if len(segments) == 0 {
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releaseSegments(segments)
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return -1, nil
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}
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reverseSegments(segments)
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return prefixIdx, segments
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}
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func (self PrefixSuffix) Len() int {
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return lenNo
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}
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func (self PrefixSuffix) Match(s string) bool {
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return strings.HasPrefix(s, self.Prefix) && strings.HasSuffix(s, self.Suffix)
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}
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func (self PrefixSuffix) String() string {
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return fmt.Sprintf("<prefix_suffix:[%s,%s]>", self.Prefix, self.Suffix)
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}
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