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71 lines
2.0 KiB
71 lines
2.0 KiB
// 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 en implements an analyzer with reasonable defaults for processing
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// English text.
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//
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// It strips possessive suffixes ('s), transforms tokens to lower case,
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// removes stopwords from a built-in list, and applies porter stemming.
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//
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// The built-in stopwords list is defined in EnglishStopWords.
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package en
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import (
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"github.com/blevesearch/bleve/v2/analysis"
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"github.com/blevesearch/bleve/v2/registry"
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"github.com/blevesearch/bleve/v2/analysis/token/lowercase"
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"github.com/blevesearch/bleve/v2/analysis/token/porter"
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"github.com/blevesearch/bleve/v2/analysis/tokenizer/unicode"
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)
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const AnalyzerName = "en"
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func AnalyzerConstructor(config map[string]interface{}, cache *registry.Cache) (*analysis.Analyzer, error) {
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tokenizer, 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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possEnFilter, err := cache.TokenFilterNamed(PossessiveName)
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if err != nil {
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return nil, err
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}
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toLowerFilter, err := cache.TokenFilterNamed(lowercase.Name)
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if err != nil {
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return nil, err
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}
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stopEnFilter, err := cache.TokenFilterNamed(StopName)
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if err != nil {
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return nil, err
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}
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stemmerEnFilter, err := cache.TokenFilterNamed(porter.Name)
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if err != nil {
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return nil, err
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}
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rv := analysis.Analyzer{
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Tokenizer: tokenizer,
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TokenFilters: []analysis.TokenFilter{
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possEnFilter,
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toLowerFilter,
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stopEnFilter,
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stemmerEnFilter,
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},
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}
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return &rv, nil
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}
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func init() {
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registry.RegisterAnalyzer(AnalyzerName, AnalyzerConstructor)
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}
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