85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package regexp
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import (
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"fmt"
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"regexp"
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"strconv"
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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 = "regexp"
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var IdeographRegexp = regexp.MustCompile(`\p{Han}|\p{Hangul}|\p{Hiragana}|\p{Katakana}`)
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type RegexpTokenizer struct {
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r *regexp.Regexp
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}
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func NewRegexpTokenizer(r *regexp.Regexp) *RegexpTokenizer {
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return &RegexpTokenizer{
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r: r,
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}
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}
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func (rt *RegexpTokenizer) Tokenize(input []byte) analysis.TokenStream {
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matches := rt.r.FindAllIndex(input, -1)
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rv := make(analysis.TokenStream, 0, len(matches))
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for i, match := range matches {
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matchBytes := input[match[0]:match[1]]
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if match[1]-match[0] > 0 {
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token := analysis.Token{
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Term: matchBytes,
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Start: match[0],
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End: match[1],
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Position: i + 1,
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Type: detectTokenType(matchBytes),
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}
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rv = append(rv, &token)
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}
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}
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return rv
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}
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func RegexpTokenizerConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.Tokenizer, error) {
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rval, ok := config["regexp"].(string)
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if !ok {
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return nil, fmt.Errorf("must specify regexp")
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}
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r, err := regexp.Compile(rval)
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if err != nil {
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return nil, fmt.Errorf("unable to build regexp tokenizer: %v", err)
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}
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return NewRegexpTokenizer(r), nil
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}
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func init() {
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registry.RegisterTokenizer(Name, RegexpTokenizerConstructor)
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}
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func detectTokenType(termBytes []byte) analysis.TokenType {
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if IdeographRegexp.Match(termBytes) {
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return analysis.Ideographic
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}
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_, err := strconv.ParseFloat(string(termBytes), 64)
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if err == nil {
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return analysis.Numeric
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}
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return analysis.AlphaNumeric
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}
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