58 lines
1.9 KiB
Go
58 lines
1.9 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 token_map implements a generic TokenMap, often used in conjunction
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// with filters to remove or process specific tokens.
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//
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// Its constructor takes the following arguments:
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//
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// "filename" (string): the path of a file listing the tokens. Each line may
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// contain one or more whitespace separated tokens, followed by an optional
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// comment starting with a "#" or "|" character.
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//
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// "tokens" ([]interface{}): if "filename" is not specified, tokens can be
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// passed directly as a sequence of strings wrapped in a []interface{}.
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package tokenmap
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import (
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"fmt"
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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 = "custom"
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func GenericTokenMapConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenMap, error) {
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rv := analysis.NewTokenMap()
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// first: try to load by filename
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filename, ok := config["filename"].(string)
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if ok {
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err := rv.LoadFile(filename)
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return rv, err
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}
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// next: look for an inline word list
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tokens, ok := config["tokens"].([]interface{})
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if ok {
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for _, token := range tokens {
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tokenStr, ok := token.(string)
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if ok {
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rv.AddToken(tokenStr)
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}
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}
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return rv, nil
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}
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return nil, fmt.Errorf("must specify filename or list of tokens for token map")
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}
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func init() {
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registry.RegisterTokenMap(Name, GenericTokenMapConstructor)
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}
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