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54 lines
1.5 KiB
54 lines
1.5 KiB
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package porter
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import (
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"bytes"
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"github.com/blevesearch/bleve/v2/analysis"
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"github.com/blevesearch/bleve/v2/registry"
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"github.com/blevesearch/go-porterstemmer"
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)
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const Name = "stemmer_porter"
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type PorterStemmer struct {
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}
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func NewPorterStemmer() *PorterStemmer {
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return &PorterStemmer{}
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}
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func (s *PorterStemmer) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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// if it is not a protected keyword, stem it
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if !token.KeyWord {
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termRunes := bytes.Runes(token.Term)
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stemmedRunes := porterstemmer.StemWithoutLowerCasing(termRunes)
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token.Term = analysis.BuildTermFromRunes(stemmedRunes)
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}
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}
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return input
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}
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func PorterStemmerConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewPorterStemmer(), nil
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}
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func init() {
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registry.RegisterTokenFilter(Name, PorterStemmerConstructor)
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}
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