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possessive_filter_en.go
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possessive_filter_en.go
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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 en
import (
"bytes"
"github.com/acgshare/bleve/analysis"
"github.com/acgshare/bleve/registry"
)
const PossessiveName = "possessive_en"
const rightSingleQuotationMark = '’'
const apostrophe = '\''
const fullWidthApostrophe = '''
const apostropheChars = rightSingleQuotationMark + apostrophe + fullWidthApostrophe
type PossessiveFilter struct {
}
func NewPossessiveFilter() *PossessiveFilter {
return &PossessiveFilter{}
}
func (s *PossessiveFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
for _, token := range input {
runes := bytes.Runes(token.Term)
if len(runes) >= 2 {
secondToLastRune := runes[len(runes)-2]
lastRune := runes[len(runes)-1]
if (secondToLastRune == rightSingleQuotationMark ||
secondToLastRune == apostrophe ||
secondToLastRune == fullWidthApostrophe) &&
(lastRune == 's' || lastRune == 'S') {
token.Term = analysis.TruncateRunes(token.Term, 2)
}
}
}
return input
}
func PossessiveFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
return NewPossessiveFilter(), nil
}
func init() {
registry.RegisterTokenFilter(PossessiveName, PossessiveFilterConstructor)
}