50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
// Copyright (c) 2018 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 nl
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import (
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/registry"
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"github.com/blevesearch/snowballstem"
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"github.com/blevesearch/snowballstem/dutch"
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)
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const SnowballStemmerName = "stemmer_nl_snowball"
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type DutchStemmerFilter struct {
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}
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func NewDutchStemmerFilter() *DutchStemmerFilter {
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return &DutchStemmerFilter{}
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}
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func (s *DutchStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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env := snowballstem.NewEnv(string(token.Term))
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dutch.Stem(env)
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token.Term = []byte(env.Current())
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}
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return input
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}
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func DutchStemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewDutchStemmerFilter(), nil
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}
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func init() {
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registry.RegisterTokenFilter(SnowballStemmerName, DutchStemmerFilterConstructor)
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}
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