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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 truncate
import (
"fmt"
"unicode/utf8"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/registry"
)
const Name = "truncate_token"
type TruncateTokenFilter struct {
length int
}
func NewTruncateTokenFilter(length int) *TruncateTokenFilter {
return &TruncateTokenFilter{
length: length,
}
}
func (s *TruncateTokenFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
for _, token := range input {
wordLen := utf8.RuneCount(token.Term)
if wordLen > s.length {
token.Term = analysis.TruncateRunes(token.Term, wordLen-s.length)
}
}
return input
}
func TruncateTokenFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
lenVal, ok := config["length"].(float64)
if !ok {
return nil, fmt.Errorf("must specify length")
}
length := int(lenVal)
return NewTruncateTokenFilter(length), nil
}
func init() {
registry.RegisterTokenFilter(Name, TruncateTokenFilterConstructor)
}
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