//  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 html

import (
	"regexp"

	"github.com/blevesearch/bleve/analysis"
	regexpCharFilter "github.com/blevesearch/bleve/analysis/char/regexp"
	"github.com/blevesearch/bleve/registry"
)

const Name = "html"

var htmlCharFilterRegexp = regexp.MustCompile(`</?[!\w]+((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[^'">\s]+))?)+\s*|\s*)/?>`)

func CharFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.CharFilter, error) {
	replaceBytes := []byte(" ")
	return regexpCharFilter.NewRegexpCharFilter(htmlCharFilterRegexp, replaceBytes), nil
}

func init() {
	registry.RegisterCharFilter(Name, CharFilterConstructor)
}