mirror of
https://github.com/go-gitea/gitea
synced 2024-11-09 11:44:27 +00:00
54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
|
// Copyright (c) 2018 Couchbase, Inc.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
package unique
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/blevesearch/bleve/analysis"
|
||
|
|
"github.com/blevesearch/bleve/registry"
|
||
|
|
)
|
||
|
|
|
||
|
|
const Name = "unique"
|
||
|
|
|
||
|
|
// UniqueTermFilter retains only the tokens which mark the first occurence of
|
||
|
|
// a term. Tokens whose term appears in a preceding token are dropped.
|
||
|
|
type UniqueTermFilter struct{}
|
||
|
|
|
||
|
|
func NewUniqueTermFilter() *UniqueTermFilter {
|
||
|
|
return &UniqueTermFilter{}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (f *UniqueTermFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
|
||
|
|
encounteredTerms := make(map[string]struct{}, len(input)/4)
|
||
|
|
j := 0
|
||
|
|
for _, token := range input {
|
||
|
|
term := string(token.Term)
|
||
|
|
if _, ok := encounteredTerms[term]; ok {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
encounteredTerms[term] = struct{}{}
|
||
|
|
input[j] = token
|
||
|
|
j++
|
||
|
|
}
|
||
|
|
return input[:j]
|
||
|
|
}
|
||
|
|
|
||
|
|
func UniqueTermFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
|
||
|
|
return NewUniqueTermFilter(), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
registry.RegisterTokenFilter(Name, UniqueTermFilterConstructor)
|
||
|
|
}
|