64 lines
1.7 KiB
Go
64 lines
1.7 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 regexp
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import (
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"bytes"
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"fmt"
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"regexp"
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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 = "regexp"
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type RegexpCharFilter struct {
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r *regexp.Regexp
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replacement []byte
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}
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func NewRegexpCharFilter(r *regexp.Regexp, replacement []byte) *RegexpCharFilter {
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return &RegexpCharFilter{
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r: r,
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replacement: replacement,
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}
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}
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func (s *RegexpCharFilter) Filter(input []byte) []byte {
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return s.r.ReplaceAllFunc(input, func(in []byte) []byte { return bytes.Repeat(s.replacement, len(in)) })
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}
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func RegexpCharFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.CharFilter, error) {
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regexpStr, ok := config["regexp"].(string)
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if !ok {
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return nil, fmt.Errorf("must specify regexp")
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}
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r, err := regexp.Compile(regexpStr)
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if err != nil {
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return nil, fmt.Errorf("unable to build regexp char filter: %v", err)
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}
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replaceBytes := []byte(" ")
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replaceStr, ok := config["replace"].(string)
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if ok {
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replaceBytes = []byte(replaceStr)
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}
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return NewRegexpCharFilter(r, replaceBytes), nil
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}
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func init() {
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registry.RegisterCharFilter(Name, RegexpCharFilterConstructor)
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}
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