139 lines
3.2 KiB
Go
139 lines
3.2 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 hi
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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_hi"
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type HindiNormalizeFilter struct {
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}
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func NewHindiNormalizeFilter() *HindiNormalizeFilter {
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return &HindiNormalizeFilter{}
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}
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func (s *HindiNormalizeFilter) 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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// dead n -> bindu
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case '\u0928':
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if i+1 < len(runes) && runes[i+1] == '\u094D' {
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runes[i] = '\u0902'
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runes = analysis.DeleteRune(runes, i+1)
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}
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// candrabindu -> bindu
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case '\u0901':
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runes[i] = '\u0902'
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// nukta deletions
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case '\u093C':
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runes = analysis.DeleteRune(runes, i)
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i--
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case '\u0929':
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runes[i] = '\u0928'
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case '\u0931':
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runes[i] = '\u0930'
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case '\u0934':
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runes[i] = '\u0933'
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case '\u0958':
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runes[i] = '\u0915'
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case '\u0959':
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runes[i] = '\u0916'
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case '\u095A':
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runes[i] = '\u0917'
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case '\u095B':
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runes[i] = '\u091C'
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case '\u095C':
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runes[i] = '\u0921'
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case '\u095D':
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runes[i] = '\u0922'
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case '\u095E':
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runes[i] = '\u092B'
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case '\u095F':
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runes[i] = '\u092F'
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// zwj/zwnj -> delete
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case '\u200D', '\u200C':
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runes = analysis.DeleteRune(runes, i)
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i--
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// virama -> delete
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case '\u094D':
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runes = analysis.DeleteRune(runes, i)
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i--
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// chandra/short -> replace
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case '\u0945', '\u0946':
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runes[i] = '\u0947'
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case '\u0949', '\u094A':
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runes[i] = '\u094B'
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case '\u090D', '\u090E':
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runes[i] = '\u090F'
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case '\u0911', '\u0912':
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runes[i] = '\u0913'
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case '\u0972':
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runes[i] = '\u0905'
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// long -> short ind. vowels
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case '\u0906':
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runes[i] = '\u0905'
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case '\u0908':
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runes[i] = '\u0907'
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case '\u090A':
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runes[i] = '\u0909'
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case '\u0960':
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runes[i] = '\u090B'
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case '\u0961':
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runes[i] = '\u090C'
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case '\u0910':
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runes[i] = '\u090F'
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case '\u0914':
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runes[i] = '\u0913'
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// long -> short dep. vowels
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case '\u0940':
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runes[i] = '\u093F'
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case '\u0942':
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runes[i] = '\u0941'
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case '\u0944':
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runes[i] = '\u0943'
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case '\u0963':
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runes[i] = '\u0962'
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case '\u0948':
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runes[i] = '\u0947'
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case '\u094C':
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runes[i] = '\u094B'
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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 NewHindiNormalizeFilter(), 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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