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
58 lines
1.8 KiB
Go
58 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/blevesearch/bleve/analysis"
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"github.com/blevesearch/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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