86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
// Copyright (c) 2014 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 ar
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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 NormalizeName = "normalize_ar"
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const (
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Alef = '\u0627'
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AlefMadda = '\u0622'
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AlefHamzaAbove = '\u0623'
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AlefHamzaBelow = '\u0625'
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Yeh = '\u064A'
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DotlessYeh = '\u0649'
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TehMarbuta = '\u0629'
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Heh = '\u0647'
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Tatweel = '\u0640'
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Fathatan = '\u064B'
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Dammatan = '\u064C'
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Kasratan = '\u064D'
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Fatha = '\u064E'
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Damma = '\u064F'
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Kasra = '\u0650'
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Shadda = '\u0651'
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Sukun = '\u0652'
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)
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type ArabicNormalizeFilter struct {
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}
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func NewArabicNormalizeFilter() *ArabicNormalizeFilter {
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return &ArabicNormalizeFilter{}
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}
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func (s *ArabicNormalizeFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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term := normalize(token.Term)
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token.Term = term
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}
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return input
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}
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func normalize(input []byte) []byte {
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runes := bytes.Runes(input)
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for i := 0; i < len(runes); i++ {
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switch runes[i] {
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case AlefMadda, AlefHamzaAbove, AlefHamzaBelow:
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runes[i] = Alef
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case DotlessYeh:
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runes[i] = Yeh
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case TehMarbuta:
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runes[i] = Heh
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case Tatweel, Kasratan, Dammatan, Fathatan, Fatha, Damma, Kasra, Shadda, Sukun:
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runes = analysis.DeleteRune(runes, i)
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i--
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}
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}
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return analysis.BuildTermFromRunes(runes)
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}
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func NormalizerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewArabicNormalizeFilter(), nil
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}
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func init() {
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registry.RegisterTokenFilter(NormalizeName, NormalizerFilterConstructor)
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}
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