1dc466a800
often the result stream was the same length, so can reuse the existing token stream also, in cases where a new stream was required, set capacity to the length of the input stream. most output stream are at least as long as the input, so this may avoid some subsequent resizing
114 lines
2.6 KiB
Go
114 lines
2.6 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 ckb
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import (
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"bytes"
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"unicode"
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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_ckb"
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const (
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Yeh = '\u064A'
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DotlessYeh = '\u0649'
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FarsiYeh = '\u06CC'
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Kaf = '\u0643'
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Keheh = '\u06A9'
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Heh = '\u0647'
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Ae = '\u06D5'
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Zwnj = '\u200C'
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HehDoachashmee = '\u06BE'
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TehMarbuta = '\u0629'
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Reh = '\u0631'
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Rreh = '\u0695'
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RrehAbove = '\u0692'
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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 SoraniNormalizeFilter struct {
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}
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func NewSoraniNormalizeFilter() *SoraniNormalizeFilter {
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return &SoraniNormalizeFilter{}
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}
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func (s *SoraniNormalizeFilter) 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 Yeh, DotlessYeh:
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runes[i] = FarsiYeh
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case Kaf:
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runes[i] = Keheh
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case Zwnj:
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if i > 0 && runes[i-1] == Heh {
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runes[i-1] = Ae
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}
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runes = analysis.DeleteRune(runes, i)
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i--
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case Heh:
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if i == len(runes)-1 {
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runes[i] = Ae
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}
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case TehMarbuta:
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runes[i] = Ae
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case HehDoachashmee:
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runes[i] = Heh
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case Reh:
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if i == 0 {
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runes[i] = Rreh
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}
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case RrehAbove:
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runes[i] = Rreh
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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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default:
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if unicode.In(runes[i], unicode.Cf) {
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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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}
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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 NewSoraniNormalizeFilter(), 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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