69 lines
1.6 KiB
Go
69 lines
1.6 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/blevesearch/bleve/analysis"
|
|
"github.com/blevesearch/bleve/registry"
|
|
)
|
|
|
|
const Name = "length"
|
|
|
|
type LengthFilter struct {
|
|
min int
|
|
max int
|
|
}
|
|
|
|
func NewLengthFilter(min, max int) *LengthFilter {
|
|
return &LengthFilter{
|
|
min: min,
|
|
max: max,
|
|
}
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
func LengthFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
|
|
min := 0
|
|
max := 0
|
|
|
|
minVal, ok := config["min"].(float64)
|
|
if ok {
|
|
min = int(minVal)
|
|
}
|
|
maxVal, ok := config["max"].(float64)
|
|
if ok {
|
|
max = int(maxVal)
|
|
}
|
|
|
|
return NewLengthFilter(min, max), nil
|
|
}
|
|
|
|
func init() {
|
|
registry.RegisterTokenFilter(Name, LengthFilterConstructor)
|
|
}
|