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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 hi
import (
"bytes"
"unicode/utf8"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/registry"
)
const StemmerName = "stemmer_hi"
type HindiStemmerFilter struct {
}
func NewHindiStemmerFilter() *HindiStemmerFilter {
return &HindiStemmerFilter{}
}
func (s *HindiStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
for _, token := range input {
// if not protected keyword, stem it
if !token.KeyWord {
stemmed := stem(token.Term)
token.Term = stemmed
}
}
return input
}
func stem(input []byte) []byte {
inputLen := utf8.RuneCount(input)
// 5
if inputLen > 6 &&
(bytes.HasSuffix(input, []byte("ाएंगी")) ||
bytes.HasSuffix(input, []byte("ाएंगे")) ||
bytes.HasSuffix(input, []byte("ाऊंगी")) ||
bytes.HasSuffix(input, []byte("ाऊंगा")) ||
bytes.HasSuffix(input, []byte("ाइयाँ")) ||
bytes.HasSuffix(input, []byte("ाइयों")) ||
bytes.HasSuffix(input, []byte("ाइयां"))) {
return analysis.TruncateRunes(input, 5)
}
// 4
if inputLen > 5 &&
(bytes.HasSuffix(input, []byte("ाएगी")) ||
bytes.HasSuffix(input, []byte("ाएगा")) ||
bytes.HasSuffix(input, []byte("ाओगी")) ||
bytes.HasSuffix(input, []byte("ाओगे")) ||
bytes.HasSuffix(input, []byte("एंगी")) ||
bytes.HasSuffix(input, []byte("ेंगी")) ||
bytes.HasSuffix(input, []byte("एंगे")) ||
bytes.HasSuffix(input, []byte("ेंगे")) ||
bytes.HasSuffix(input, []byte("ूंगी")) ||
bytes.HasSuffix(input, []byte("ूंगा")) ||
bytes.HasSuffix(input, []byte("ातीं")) ||
bytes.HasSuffix(input, []byte("नाओं")) ||
bytes.HasSuffix(input, []byte("नाएं")) ||
bytes.HasSuffix(input, []byte("ताओं")) ||
bytes.HasSuffix(input, []byte("ताएं")) ||
bytes.HasSuffix(input, []byte("ियाँ")) ||
bytes.HasSuffix(input, []byte("ियों")) ||
bytes.HasSuffix(input, []byte("ियां"))) {
return analysis.TruncateRunes(input, 4)
}
// 3
if inputLen > 4 &&
(bytes.HasSuffix(input, []byte("ाकर")) ||
bytes.HasSuffix(input, []byte("ाइए")) ||
bytes.HasSuffix(input, []byte("ाईं")) ||
bytes.HasSuffix(input, []byte("ाया")) ||
bytes.HasSuffix(input, []byte("ेगी")) ||
bytes.HasSuffix(input, []byte("ेगा")) ||
bytes.HasSuffix(input, []byte("ोगी")) ||
bytes.HasSuffix(input, []byte("ोगे")) ||
bytes.HasSuffix(input, []byte("ाने")) ||
bytes.HasSuffix(input, []byte("ाना")) ||
bytes.HasSuffix(input, []byte("ाते")) ||
bytes.HasSuffix(input, []byte("ाती")) ||
bytes.HasSuffix(input, []byte("ाता")) ||
bytes.HasSuffix(input, []byte("तीं")) ||
bytes.HasSuffix(input, []byte("ाओं")) ||
bytes.HasSuffix(input, []byte("ाएं")) ||
bytes.HasSuffix(input, []byte("ुओं")) ||
bytes.HasSuffix(input, []byte("ुएं")) ||
bytes.HasSuffix(input, []byte("ुआं"))) {
return analysis.TruncateRunes(input, 3)
}
// 2
if inputLen > 3 &&
(bytes.HasSuffix(input, []byte("कर")) ||
bytes.HasSuffix(input, []byte("ाओ")) ||
bytes.HasSuffix(input, []byte("िए")) ||
bytes.HasSuffix(input, []byte("ाई")) ||
bytes.HasSuffix(input, []byte("ाए")) ||
bytes.HasSuffix(input, []byte("ने")) ||
bytes.HasSuffix(input, []byte("नी")) ||
bytes.HasSuffix(input, []byte("ना")) ||
bytes.HasSuffix(input, []byte("ते")) ||
bytes.HasSuffix(input, []byte("ीं")) ||
bytes.HasSuffix(input, []byte("ती")) ||
bytes.HasSuffix(input, []byte("ता")) ||
bytes.HasSuffix(input, []byte("ाँ")) ||
bytes.HasSuffix(input, []byte("ां")) ||
bytes.HasSuffix(input, []byte("ों")) ||
bytes.HasSuffix(input, []byte("ें"))) {
return analysis.TruncateRunes(input, 2)
}
// 1
if inputLen > 2 &&
(bytes.HasSuffix(input, []byte("")) ||
bytes.HasSuffix(input, []byte("")) ||
bytes.HasSuffix(input, []byte("")) ||
bytes.HasSuffix(input, []byte("")) ||
bytes.HasSuffix(input, []byte("")) ||
bytes.HasSuffix(input, []byte("ि")) ||
bytes.HasSuffix(input, []byte(""))) {
return analysis.TruncateRunes(input, 1)
}
return input
}
func StemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
return NewHindiStemmerFilter(), nil
}
func init() {
registry.RegisterTokenFilter(StemmerName, StemmerFilterConstructor)
}
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