1//  Copyright (c) 2018 Couchbase, Inc.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// 		http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package hu
16
17import (
18	"github.com/blevesearch/bleve/analysis"
19	"github.com/blevesearch/bleve/registry"
20
21	"github.com/blevesearch/snowballstem"
22	"github.com/blevesearch/snowballstem/hungarian"
23)
24
25const SnowballStemmerName = "stemmer_hu_snowball"
26
27type HungarianStemmerFilter struct {
28}
29
30func NewHungarianStemmerFilter() *HungarianStemmerFilter {
31	return &HungarianStemmerFilter{}
32}
33
34func (s *HungarianStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
35	for _, token := range input {
36		env := snowballstem.NewEnv(string(token.Term))
37		hungarian.Stem(env)
38		token.Term = []byte(env.Current())
39	}
40	return input
41}
42
43func HungarianStemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
44	return NewHungarianStemmerFilter(), nil
45}
46
47func init() {
48	registry.RegisterTokenFilter(SnowballStemmerName, HungarianStemmerFilterConstructor)
49}
50