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