136 lines
3.6 KiB
Go
136 lines
3.6 KiB
Go
// 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 custom
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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 AnalyzerConstructor(config map[string]interface{}, cache *registry.Cache) (*analysis.Analyzer, error) {
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var err error
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var charFilters []analysis.CharFilter
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charFiltersNames, ok := config["char_filters"].([]string)
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if ok {
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charFilters, err = getCharFilters(charFiltersNames, cache)
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if err != nil {
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return nil, err
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}
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} else {
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charFiltersNamesInterfaceSlice, ok := config["char_filters"].([]interface{})
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if ok {
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charFiltersNames, err := convertInterfaceSliceToStringSlice(charFiltersNamesInterfaceSlice, "char filter")
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if err != nil {
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return nil, err
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}
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charFilters, err = getCharFilters(charFiltersNames, cache)
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if err != nil {
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return nil, err
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}
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}
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}
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tokenizerName, ok := config["tokenizer"].(string)
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if !ok {
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return nil, fmt.Errorf("must specify tokenizer")
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}
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tokenizer, err := cache.TokenizerNamed(tokenizerName)
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if err != nil {
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return nil, err
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}
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var tokenFilters []analysis.TokenFilter
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tokenFiltersNames, ok := config["token_filters"].([]string)
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if ok {
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tokenFilters, err = getTokenFilters(tokenFiltersNames, cache)
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if err != nil {
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return nil, err
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}
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} else {
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tokenFiltersNamesInterfaceSlice, ok := config["token_filters"].([]interface{})
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if ok {
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tokenFiltersNames, err := convertInterfaceSliceToStringSlice(tokenFiltersNamesInterfaceSlice, "token filter")
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if err != nil {
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return nil, err
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}
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tokenFilters, err = getTokenFilters(tokenFiltersNames, cache)
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if err != nil {
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return nil, err
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}
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}
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}
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rv := analysis.Analyzer{
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Tokenizer: tokenizer,
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}
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if charFilters != nil {
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rv.CharFilters = charFilters
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}
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if tokenFilters != nil {
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rv.TokenFilters = tokenFilters
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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(Name, AnalyzerConstructor)
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}
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func getCharFilters(charFilterNames []string, cache *registry.Cache) ([]analysis.CharFilter, error) {
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charFilters := make([]analysis.CharFilter, len(charFilterNames))
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for i, charFilterName := range charFilterNames {
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charFilter, err := cache.CharFilterNamed(charFilterName)
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if err != nil {
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return nil, err
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}
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charFilters[i] = charFilter
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}
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return charFilters, nil
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}
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func getTokenFilters(tokenFilterNames []string, cache *registry.Cache) ([]analysis.TokenFilter, error) {
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tokenFilters := make([]analysis.TokenFilter, len(tokenFilterNames))
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for i, tokenFilterName := range tokenFilterNames {
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tokenFilter, err := cache.TokenFilterNamed(tokenFilterName)
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if err != nil {
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return nil, err
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}
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tokenFilters[i] = tokenFilter
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}
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return tokenFilters, nil
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}
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func convertInterfaceSliceToStringSlice(interfaceSlice []interface{}, objType string) ([]string, error) {
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stringSlice := make([]string, len(interfaceSlice))
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for i, interfaceObj := range interfaceSlice {
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stringObj, ok := interfaceObj.(string)
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if ok {
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stringSlice[i] = stringObj
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} else {
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return nil, fmt.Errorf(objType + " name must be a string")
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}
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}
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return stringSlice, nil
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}
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