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
121 lines
3.1 KiB
Go
121 lines
3.1 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 edge_ngram_filter
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import (
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"bytes"
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"fmt"
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"unicode/utf8"
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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 Name = "edge_ngram"
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type Side bool
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const BACK Side = true
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const FRONT Side = false
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type EdgeNgramFilter struct {
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back Side
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minLength int
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maxLength int
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}
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func NewEdgeNgramFilter(side Side, minLength, maxLength int) *EdgeNgramFilter {
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return &EdgeNgramFilter{
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back: side,
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minLength: minLength,
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maxLength: maxLength,
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}
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}
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func (s *EdgeNgramFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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rv := make(analysis.TokenStream, 0, len(input))
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for _, token := range input {
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runeCount := utf8.RuneCount(token.Term)
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runes := bytes.Runes(token.Term)
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if s.back {
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i := runeCount
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// index of the starting rune for this token
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for ngramSize := s.minLength; ngramSize <= s.maxLength; ngramSize++ {
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// build an ngram of this size starting at i
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if i-ngramSize > 0 {
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ngramTerm := buildTermFromRunes(runes[i-ngramSize : i])
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token := analysis.Token{
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Position: token.Position,
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Start: token.Start,
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End: token.End,
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Type: token.Type,
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Term: ngramTerm,
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}
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rv = append(rv, &token)
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}
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}
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} else {
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i := 0
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// index of the starting rune for this token
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for ngramSize := s.minLength; ngramSize <= s.maxLength; ngramSize++ {
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// build an ngram of this size starting at i
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if i+ngramSize <= runeCount {
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ngramTerm := buildTermFromRunes(runes[i : i+ngramSize])
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token := analysis.Token{
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Position: token.Position,
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Start: token.Start,
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End: token.End,
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Type: token.Type,
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Term: ngramTerm,
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}
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rv = append(rv, &token)
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}
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}
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}
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}
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return rv
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}
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func buildTermFromRunes(runes []rune) []byte {
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rv := make([]byte, 0, len(runes)*4)
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for _, r := range runes {
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runeBytes := make([]byte, utf8.RuneLen(r))
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utf8.EncodeRune(runeBytes, r)
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rv = append(rv, runeBytes...)
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}
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return rv
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}
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func EdgeNgramFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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side := FRONT
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back, ok := config["back"].(bool)
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if ok && back {
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side = BACK
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}
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minVal, ok := config["min"].(float64)
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if !ok {
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return nil, fmt.Errorf("must specify min")
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}
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min := int(minVal)
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maxVal, ok := config["max"].(float64)
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if !ok {
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return nil, fmt.Errorf("must specify max")
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}
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max := int(maxVal)
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return NewEdgeNgramFilter(side, min, max), nil
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}
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func init() {
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registry.RegisterTokenFilter(Name, EdgeNgramFilterConstructor)
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}
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