75 lines
2.0 KiB
Go
75 lines
2.0 KiB
Go
// Copyright (c) 2015 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package fr
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import (
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"bytes"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/registry"
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)
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const MinimalStemmerName = "stemmer_fr_min"
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type FrenchMinimalStemmerFilter struct {
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}
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func NewFrenchMinimalStemmerFilter() *FrenchMinimalStemmerFilter {
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return &FrenchMinimalStemmerFilter{}
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}
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func (s *FrenchMinimalStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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runes := bytes.Runes(token.Term)
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runes = minstem(runes)
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token.Term = analysis.BuildTermFromRunes(runes)
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}
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return input
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}
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func minstem(input []rune) []rune {
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if len(input) < 6 {
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return input
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}
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if input[len(input)-1] == 'x' {
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if input[len(input)-3] == 'a' && input[len(input)-2] == 'u' {
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input[len(input)-2] = 'l'
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}
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return input[0 : len(input)-1]
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}
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if input[len(input)-1] == 's' {
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input = input[0 : len(input)-1]
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}
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if input[len(input)-1] == 'r' {
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input = input[0 : len(input)-1]
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}
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if input[len(input)-1] == 'e' {
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input = input[0 : len(input)-1]
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}
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if input[len(input)-1] == 'é' {
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input = input[0 : len(input)-1]
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}
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if input[len(input)-1] == input[len(input)-2] {
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input = input[0 : len(input)-1]
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}
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return input
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}
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func FrenchMinimalStemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewFrenchMinimalStemmerFilter(), nil
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}
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func init() {
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registry.RegisterTokenFilter(MinimalStemmerName, FrenchMinimalStemmerFilterConstructor)
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}
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