80 lines
1.8 KiB
Go
80 lines
1.8 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 length
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import (
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"fmt"
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"unicode/utf8"
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"github.com/blevesearch/bleve/v2/analysis"
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"github.com/blevesearch/bleve/v2/registry"
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)
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const Name = "length"
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type LengthFilter struct {
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min int
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max int
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}
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func NewLengthFilter(min, max int) *LengthFilter {
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return &LengthFilter{
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min: min,
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max: max,
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}
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}
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func (f *LengthFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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rv := make(analysis.TokenStream, 0, len(input))
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for _, token := range input {
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wordLen := utf8.RuneCount(token.Term)
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if f.min > 0 && f.min > wordLen {
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continue
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}
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if f.max > 0 && f.max < wordLen {
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continue
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}
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rv = append(rv, token)
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}
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return rv
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}
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func LengthFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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min := 0
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max := 0
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minVal, ok := config["min"].(float64)
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if ok {
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min = int(minVal)
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}
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maxVal, ok := config["max"].(float64)
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if ok {
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max = int(maxVal)
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}
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if min == max && max == 0 {
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return nil, fmt.Errorf("either min or max must be non-zero")
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}
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return NewLengthFilter(min, max), nil
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}
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func init() {
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err := registry.RegisterTokenFilter(Name, LengthFilterConstructor)
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if err != nil {
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panic(err)
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}
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}
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