b8de2df68d
this introduces a new light Spanish stemmer and move the other pure Go Spanish analysis components back in from the blevex package the libstemmer version of the stemmer will remain in blevex
92 lines
2.1 KiB
Go
92 lines
2.1 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/analysis"
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"github.com/blevesearch/bleve/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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for i, r := range input {
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switch r {
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case 'à', 'á', 'â', 'ä':
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input[i] = 'a'
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case 'ò', 'ó', 'ô', 'ö':
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input[i] = 'o'
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case 'è', 'é', 'ê', 'ë':
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input[i] = 'e'
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case 'ù', 'ú', 'û', 'ü':
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input[i] = 'u'
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case 'ì', 'í', 'î', 'ï':
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input[i] = 'i'
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}
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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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registry.RegisterTokenFilter(LightStemmerName,
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SpanishLightStemmerFilterConstructor)
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}
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