mirror of
https://github.com/octoleo/syncthing.git
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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%
100 lines
1.7 KiB
Go
100 lines
1.7 KiB
Go
package match
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import (
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"fmt"
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)
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type EveryOf struct {
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Matchers Matchers
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}
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func NewEveryOf(m ...Matcher) EveryOf {
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return EveryOf{Matchers(m)}
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}
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func (self *EveryOf) Add(m Matcher) error {
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self.Matchers = append(self.Matchers, m)
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return nil
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}
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func (self EveryOf) Len() (l int) {
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for _, m := range self.Matchers {
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if ml := m.Len(); l > 0 {
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l += ml
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} else {
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return -1
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}
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}
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return
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}
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func (self EveryOf) Index(s string) (int, []int) {
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var index int
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var offset int
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// make `in` with cap as len(s),
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// cause it is the maximum size of output segments values
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next := acquireSegments(len(s))
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current := acquireSegments(len(s))
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sub := s
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for i, m := range self.Matchers {
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idx, seg := m.Index(sub)
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if idx == -1 {
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releaseSegments(next)
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releaseSegments(current)
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return -1, nil
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}
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if i == 0 {
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// we use copy here instead of `current = seg`
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// cause seg is a slice from reusable buffer `in`
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// and it could be overwritten in next iteration
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current = append(current, seg...)
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} else {
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// clear the next
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next = next[:0]
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delta := index - (idx + offset)
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for _, ex := range current {
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for _, n := range seg {
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if ex+delta == n {
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next = append(next, n)
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}
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}
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}
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if len(next) == 0 {
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releaseSegments(next)
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releaseSegments(current)
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return -1, nil
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}
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current = append(current[:0], next...)
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}
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index = idx + offset
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sub = s[index:]
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offset += idx
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}
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releaseSegments(next)
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return index, current
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}
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func (self EveryOf) Match(s string) bool {
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for _, m := range self.Matchers {
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if !m.Match(s) {
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return false
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}
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}
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return true
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}
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func (self EveryOf) String() string {
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return fmt.Sprintf("<every_of:[%s]>", self.Matchers)
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}
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