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// Copyright (c) 2014 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ckb
import (
"bytes"
"unicode"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/registry"
)
const NormalizeName = "normalize_ckb"
const (
Yeh = '\u064A'
DotlessYeh = '\u0649'
FarsiYeh = '\u06CC'
Kaf = '\u0643'
Keheh = '\u06A9'
Heh = '\u0647'
Ae = '\u06D5'
Zwnj = '\u200C'
HehDoachashmee = '\u06BE'
TehMarbuta = '\u0629'
Reh = '\u0631'
Rreh = '\u0695'
RrehAbove = '\u0692'
Tatweel = '\u0640'
Fathatan = '\u064B'
Dammatan = '\u064C'
Kasratan = '\u064D'
Fatha = '\u064E'
Damma = '\u064F'
Kasra = '\u0650'
Shadda = '\u0651'
Sukun = '\u0652'
)
type SoraniNormalizeFilter struct {
}
func NewSoraniNormalizeFilter() *SoraniNormalizeFilter {
return &SoraniNormalizeFilter{}
}
func (s *SoraniNormalizeFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
for _, token := range input {
term := normalize(token.Term)
token.Term = term
}
return input
}
func normalize(input []byte) []byte {
runes := bytes.Runes(input)
for i := 0; i < len(runes); i++ {
switch runes[i] {
case Yeh, DotlessYeh:
runes[i] = FarsiYeh
case Kaf:
runes[i] = Keheh
case Zwnj:
if i > 0 && runes[i-1] == Heh {
runes[i-1] = Ae
}
runes = analysis.DeleteRune(runes, i)
i--
case Heh:
if i == len(runes)-1 {
runes[i] = Ae
}
case TehMarbuta:
runes[i] = Ae
case HehDoachashmee:
runes[i] = Heh
case Reh:
if i == 0 {
runes[i] = Rreh
}
case RrehAbove:
runes[i] = Rreh
case Tatweel, Kasratan, Dammatan, Fathatan, Fatha, Damma, Kasra, Shadda, Sukun:
runes = analysis.DeleteRune(runes, i)
i--
default:
if unicode.In(runes[i], unicode.Cf) {
runes = analysis.DeleteRune(runes, i)
i--
}
}
}
return analysis.BuildTermFromRunes(runes)
}
func NormalizerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
return NewSoraniNormalizeFilter(), nil
}
func init() {
registry.RegisterTokenFilter(NormalizeName, NormalizerFilterConstructor)
}
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