58 lines
1.6 KiB
Go
58 lines
1.6 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 pl
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import (
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"github.com/blevesearch/bleve/v2/analysis"
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"github.com/blevesearch/bleve/v2/analysis/lang/pl/stempel"
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"github.com/blevesearch/bleve/v2/registry"
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)
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const SnowballStemmerName = "stemmer_pl"
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type PolishStemmerFilter struct {
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trie stempel.Trie
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}
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func NewPolishStemmerFilter() (*PolishStemmerFilter, error) {
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trie, err := stempel.LoadTrie()
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if err != nil {
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return nil, err
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}
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return &PolishStemmerFilter{
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trie: trie,
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}, nil
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}
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func (s *PolishStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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buff := []rune(string(token.Term))
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diff := s.trie.GetLastOnPath(buff)
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buff = stempel.Diff(buff, diff)
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token.Term = []byte(string(buff))
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}
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return input
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}
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func PolishStemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewPolishStemmerFilter()
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}
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func init() {
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err := registry.RegisterTokenFilter(SnowballStemmerName, PolishStemmerFilterConstructor)
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if err != nil {
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panic(err)
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}
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}
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