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High Speed Byte Trie
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package flashtext | |
type bytetrie struct { | |
key byte | |
next [256]*bytetrie | |
word string | |
} | |
func NewByteTrie(b byte) *bytetrie { | |
return &bytetrie{ | |
key: b, | |
} | |
} | |
func (t *bytetrie) addKeyword(keyword string) { | |
var pos = t | |
for _, b := range []byte( keyword ){ | |
pos = pos.getOrSet(b) | |
} | |
pos.word = keyword | |
} | |
func (t *bytetrie) removeKeyword(keyword string) { | |
var pos = t | |
for _, b := range []byte( keyword ) { | |
pos = pos.getOrSet(b) | |
} | |
//fake delete | |
pos.word = "" | |
} | |
func (t *bytetrie) getOrSet(b byte) *bytetrie { | |
if t.next[b] != nil{ | |
return t.next[b] | |
} | |
next := NewByteTrie(b) | |
t.next[b] = next | |
return next | |
} | |
func (t *bytetrie) exists(keyword string) bool { | |
var keytrie = t | |
for _, b := range []byte( keyword ) { | |
if keytrie.next[b]!=nil { | |
keytrie = keytrie.next[b] | |
} else { | |
return false | |
} | |
} | |
return keytrie.word != "" | |
} |
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原来的版本是rune作为key的,太慢了。