45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
|
// 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 length_filter
|
||
|
|
||
|
import (
|
||
|
"unicode/utf8"
|
||
|
|
||
|
"github.com/couchbaselabs/bleve/analysis"
|
||
|
)
|
||
|
|
||
|
type LengthFilter struct {
|
||
|
min int
|
||
|
max int
|
||
|
}
|
||
|
|
||
|
func NewLengthFilter(min, max int) (*LengthFilter, error) {
|
||
|
return &LengthFilter{
|
||
|
min: min,
|
||
|
max: max,
|
||
|
}, nil
|
||
|
}
|
||
|
|
||
|
func (f *LengthFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
|
||
|
rv := make(analysis.TokenStream, 0)
|
||
|
|
||
|
for _, token := range input {
|
||
|
wordLen := utf8.RuneCount(token.Term)
|
||
|
if f.min > 0 && f.min > wordLen {
|
||
|
continue
|
||
|
}
|
||
|
if f.max > 0 && f.max < wordLen {
|
||
|
continue
|
||
|
}
|
||
|
rv = append(rv, token)
|
||
|
}
|
||
|
|
||
|
return rv
|
||
|
}
|