84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
// Copyright (c) 2014 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 ar
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import (
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"bytes"
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"github.com/couchbaselabs/bleve/analysis"
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"github.com/couchbaselabs/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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ALEF_MADDA = '\u0622'
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ALEF_HAMZA_ABOVE = '\u0623'
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ALEF_HAMZA_BELOW = '\u0625'
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YEH = '\u064A'
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DOTLESS_YEH = '\u0649'
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TEH_MARBUTA = '\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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rv := make(analysis.TokenStream, 0)
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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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rv = append(rv, token)
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}
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return rv
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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 ALEF_MADDA, ALEF_HAMZA_ABOVE, ALEF_HAMZA_BELOW:
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runes[i] = ALEF
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case DOTLESS_YEH:
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runes[i] = YEH
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case TEH_MARBUTA:
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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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