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79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
// Copyright (c) 2017 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 es
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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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)
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const LightStemmerName = "stemmer_es_light"
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type SpanishLightStemmerFilter struct {
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}
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func NewSpanishLightStemmerFilter() *SpanishLightStemmerFilter {
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return &SpanishLightStemmerFilter{}
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}
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func (s *SpanishLightStemmerFilter) Filter(
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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 = stem(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 stem(input []rune) []rune {
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l := len(input)
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if l < 5 {
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return input
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}
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switch input[l-1] {
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case 'o', 'a', 'e':
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return input[:l-1]
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case 's':
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if input[l-2] == 'e' && input[l-3] == 's' && input[l-4] == 'e' {
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return input[:l-2]
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}
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if input[l-2] == 'e' && input[l-3] == 'c' {
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input[l-3] = 'z'
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return input[:l-2]
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}
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if input[l-2] == 'o' || input[l-2] == 'a' || input[l-2] == 'e' {
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return input[:l-2]
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}
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}
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return input
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}
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func SpanishLightStemmerFilterConstructor(config map[string]interface{},
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cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewSpanishLightStemmerFilter(), nil
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}
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func init() {
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err := registry.RegisterTokenFilter(LightStemmerName, SpanishLightStemmerFilterConstructor)
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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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