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// Copyright (c) 2014 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// package token_map implements a generic TokenMap, often used in conjunction
// with filters to remove or process specific tokens.
//
// Its constructor takes the following arguments:
//
// "filename" (string): the path of a file listing the tokens. Each line may
// contain one or more whitespace separated tokens, followed by an optional
// comment starting with a "#" or "|" character.
//
// "tokens" ([]interface{}): if "filename" is not specified, tokens can be
// passed directly as a sequence of strings wrapped in a []interface{}.
package tokenmap
import (
"fmt"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/registry"
)
const Name = "custom"
func GenericTokenMapConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenMap, error) {
rv := analysis.NewTokenMap()
// first: try to load by filename
filename, ok := config["filename"].(string)
if ok {
err := rv.LoadFile(filename)
return rv, err
}
// next: look for an inline word list
tokens, ok := config["tokens"].([]interface{})
if ok {
for _, token := range tokens {
tokenStr, ok := token.(string)
if ok {
rv.AddToken(tokenStr)
}
}
return rv, nil
}
return nil, fmt.Errorf("must specify filename or list of tokens for token map")
}
func init() {
registry.RegisterTokenMap(Name, GenericTokenMapConstructor)
}
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