//  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

import (
	"fmt"

	"github.com/blevesearch/bleve/analysis"
	"github.com/blevesearch/bleve/registry"
)

const Name = "standard"

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)
}