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gitea-fork-majority-judgment/vendor/github.com/blevesearch/bleve/v2/analysis/lang/en/stemmer_en_snowball.go

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// Copyright (c) 2020 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 en
import (
"github.com/blevesearch/bleve/v2/analysis"
"github.com/blevesearch/bleve/v2/registry"
"github.com/blevesearch/snowballstem"
"github.com/blevesearch/snowballstem/english"
)
const SnowballStemmerName = "stemmer_en_snowball"
type EnglishStemmerFilter struct {
}
func NewEnglishStemmerFilter() *EnglishStemmerFilter {
return &EnglishStemmerFilter{}
}
func (s *EnglishStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
for _, token := range input {
env := snowballstem.NewEnv(string(token.Term))
english.Stem(env)
token.Term = []byte(env.Current())
}
return input
}
func EnglishStemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
return NewEnglishStemmerFilter(), nil
}
func init() {
registry.RegisterTokenFilter(SnowballStemmerName, EnglishStemmerFilterConstructor)
}