e472b3e807
The goal of the "web" tokenizer is to recognize web things like - email addresses - URLs - twitter @handles and #hashtags This implementation uses regexp exceptions. There will most likely be endless debate about the regular expressions. These were chosein as "good enough for now". There is also a "web" analyzer. This is just the "standard" analyzer, but using the "web" tokenizer instead of the "unicode" one. NOTE: after processing the exceptions, it still falls back to the standard "unicode" one. For many users, you can simply set your mapping's default analyzer to be "web". closes #269
43 lines
2.1 KiB
Go
43 lines
2.1 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 web
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import (
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"regexp"
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"strings"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/analysis/tokenizers/exception"
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"github.com/blevesearch/bleve/analysis/tokenizers/unicode"
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"github.com/blevesearch/bleve/registry"
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)
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const Name = "web"
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var email = `(?:[a-z0-9!#$%&'*+/=?^_` + "`" + `{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_` + "`" + `{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])`
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var url = `(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s` + "`" + `!()\[\]{};:'".,<>?«»“”‘’]))`
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var twitterHandle = `@([a-zA-Z0-9_]){1,15}`
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var twitterHashtag = `#([a-zA-Z0-9_])+`
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var exceptions = []string{email, url, twitterHandle, twitterHashtag}
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var exceptionsRegexp = regexp.MustCompile(strings.Join(exceptions, "|"))
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func TokenizerConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.Tokenizer, error) {
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remainingTokenizer, err := cache.TokenizerNamed(unicode.Name)
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if err != nil {
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return nil, err
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}
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return exception.NewExceptionsTokenizer(exceptionsRegexp, remainingTokenizer), nil
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}
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func init() {
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registry.RegisterTokenizer(Name, TokenizerConstructor)
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}
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