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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 custom
import (
"fmt"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/registry"
)
const Name = "custom"
func AnalyzerConstructor(config map[string]interface{}, cache *registry.Cache) (*analysis.Analyzer, error) {
var err error
var charFilters []analysis.CharFilter
charFiltersValue, ok := config["char_filters"]
if ok {
switch charFiltersValue := charFiltersValue.(type) {
case []string:
charFilters, err = getCharFilters(charFiltersValue, cache)
if err != nil {
return nil, err
}
case []interface{}:
charFiltersNames, err := convertInterfaceSliceToStringSlice(charFiltersValue, "char filter")
if err != nil {
return nil, err
}
charFilters, err = getCharFilters(charFiltersNames, cache)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("unsupported type for char_filters, must be slice")
}
}
var tokenizerName string
tokenizerValue, ok := config["tokenizer"]
if ok {
tokenizerName, ok = tokenizerValue.(string)
if !ok {
return nil, fmt.Errorf("must specify tokenizer as string")
}
} else {
return nil, fmt.Errorf("must specify tokenizer")
}
tokenizer, err := cache.TokenizerNamed(tokenizerName)
if err != nil {
return nil, err
}
var tokenFilters []analysis.TokenFilter
tokenFiltersValue, ok := config["token_filters"]
if ok {
switch tokenFiltersValue := tokenFiltersValue.(type) {
case []string:
tokenFilters, err = getTokenFilters(tokenFiltersValue, cache)
if err != nil {
return nil, err
}
case []interface{}:
tokenFiltersNames, err := convertInterfaceSliceToStringSlice(tokenFiltersValue, "token filter")
if err != nil {
return nil, err
}
tokenFilters, err = getTokenFilters(tokenFiltersNames, cache)
if err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("unsupported type for token_filters, must be slice")
}
}
rv := analysis.Analyzer{
Tokenizer: tokenizer,
}
if charFilters != nil {
rv.CharFilters = charFilters
}
if tokenFilters != nil {
rv.TokenFilters = tokenFilters
}
return &rv, nil
}
func init() {
registry.RegisterAnalyzer(Name, AnalyzerConstructor)
}
func getCharFilters(charFilterNames []string, cache *registry.Cache) ([]analysis.CharFilter, error) {
charFilters := make([]analysis.CharFilter, len(charFilterNames))
for i, charFilterName := range charFilterNames {
charFilter, err := cache.CharFilterNamed(charFilterName)
if err != nil {
return nil, err
}
charFilters[i] = charFilter
}
return charFilters, nil
}
func getTokenFilters(tokenFilterNames []string, cache *registry.Cache) ([]analysis.TokenFilter, error) {
tokenFilters := make([]analysis.TokenFilter, len(tokenFilterNames))
for i, tokenFilterName := range tokenFilterNames {
tokenFilter, err := cache.TokenFilterNamed(tokenFilterName)
if err != nil {
return nil, err
}
tokenFilters[i] = tokenFilter
}
return tokenFilters, nil
}
func convertInterfaceSliceToStringSlice(interfaceSlice []interface{}, objType string) ([]string, error) {
stringSlice := make([]string, len(interfaceSlice))
for i, interfaceObj := range interfaceSlice {
stringObj, ok := interfaceObj.(string)
if ok {
stringSlice[i] = stringObj
} else {
return nil, fmt.Errorf(objType + " name must be a string")
}
}
return stringSlice, nil
}
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