add a pure Go German analyzer
this introduces new German light stemmer and moves the other pure Go german analysis components back in from the blevex package the libstemmer version of the stemmer will remain in blevex
This commit is contained in:
parent
11a45d6f9c
commit
ce901a8870
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// Copyright (c) 2017 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 de
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import (
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/analysis/token/lowercase"
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"github.com/blevesearch/bleve/analysis/tokenizer/unicode"
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"github.com/blevesearch/bleve/registry"
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)
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const AnalyzerName = "de"
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func AnalyzerConstructor(config map[string]interface{}, cache *registry.Cache) (*analysis.Analyzer, error) {
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unicodeTokenizer, err := cache.TokenizerNamed(unicode.Name)
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if err != nil {
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return nil, err
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}
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toLowerFilter, err := cache.TokenFilterNamed(lowercase.Name)
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if err != nil {
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return nil, err
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}
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stopDeFilter, err := cache.TokenFilterNamed(StopName)
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if err != nil {
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return nil, err
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}
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normalizeDeFilter, err := cache.TokenFilterNamed(NormalizeName)
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if err != nil {
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return nil, err
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}
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lightStemmerDeFilter, err := cache.TokenFilterNamed(LightStemmerName)
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if err != nil {
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return nil, err
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}
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rv := analysis.Analyzer{
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Tokenizer: unicodeTokenizer,
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TokenFilters: []analysis.TokenFilter{
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toLowerFilter,
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stopDeFilter,
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normalizeDeFilter,
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lightStemmerDeFilter,
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},
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}
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return &rv, nil
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}
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func init() {
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registry.RegisterAnalyzer(AnalyzerName, AnalyzerConstructor)
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}
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// Copyright (c) 2017 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 de
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import (
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"reflect"
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"testing"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/registry"
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)
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func TestGermanAnalyzer(t *testing.T) {
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tests := []struct {
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input []byte
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output analysis.TokenStream
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}{
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{
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input: []byte("Tisch"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("tisch"),
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Position: 1,
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Start: 0,
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End: 5,
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},
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},
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},
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{
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input: []byte("Tische"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("tisch"),
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Position: 1,
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Start: 0,
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End: 6,
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},
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},
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},
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{
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input: []byte("Tischen"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("tisch"),
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Position: 1,
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Start: 0,
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End: 7,
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},
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},
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},
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// german specials
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{
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input: []byte("Schaltflächen"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("schaltflach"),
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Position: 1,
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Start: 0,
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End: 14,
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},
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},
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},
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{
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input: []byte("Schaltflaechen"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("schaltflach"),
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Position: 1,
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Start: 0,
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End: 14,
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},
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},
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},
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// tests added by marty to increase coverage
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{
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input: []byte("Blechern"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("blech"),
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Position: 1,
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Start: 0,
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End: 8,
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},
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},
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},
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{
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input: []byte("Klecks"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("kleck"),
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Position: 1,
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Start: 0,
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End: 6,
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},
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},
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},
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{
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input: []byte("Mindestens"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("mindest"),
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Position: 1,
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Start: 0,
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End: 10,
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},
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},
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},
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{
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input: []byte("Kugelfest"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("kugelf"),
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Position: 1,
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Start: 0,
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End: 9,
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},
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},
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},
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{
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input: []byte("Baldigst"),
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("baldig"),
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Position: 1,
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Start: 0,
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End: 8,
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},
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},
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},
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}
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cache := registry.NewCache()
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analyzer, err := cache.AnalyzerNamed(AnalyzerName)
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if err != nil {
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t.Fatal(err)
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}
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for _, test := range tests {
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actual := analyzer.Analyze(test.input)
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if !reflect.DeepEqual(actual, test.output) {
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t.Errorf("expected %v, got %v", test.output, actual)
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}
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}
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}
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// Copyright (c) 2017 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 de
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import (
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"bytes"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/registry"
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)
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const NormalizeName = "normalize_de"
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const (
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N = 0 /* ordinary state */
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V = 1 /* stops 'u' from entering umlaut state */
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U = 2 /* umlaut state, allows e-deletion */
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)
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type GermanNormalizeFilter struct {
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}
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func NewGermanNormalizeFilter() *GermanNormalizeFilter {
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return &GermanNormalizeFilter{}
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}
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func (s *GermanNormalizeFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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term := normalize(token.Term)
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token.Term = term
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}
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return input
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}
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func normalize(input []byte) []byte {
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state := N
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runes := bytes.Runes(input)
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for i := 0; i < len(runes); i++ {
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switch runes[i] {
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case 'a', 'o':
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state = U
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case 'u':
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if state == N {
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state = U
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} else {
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state = V
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}
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case 'e':
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if state == U {
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runes = analysis.DeleteRune(runes, i)
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i--
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}
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state = V
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case 'i', 'q', 'y':
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state = V
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case 'ä':
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runes[i] = 'a'
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state = V
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case 'ö':
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runes[i] = 'o'
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state = V
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case 'ü':
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runes[i] = 'u'
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state = V
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case 'ß':
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runes[i] = 's'
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i++
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runes = analysis.InsertRune(runes, i, 's')
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state = N
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default:
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state = N
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}
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}
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return analysis.BuildTermFromRunes(runes)
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}
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func NormalizerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewGermanNormalizeFilter(), nil
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}
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func init() {
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registry.RegisterTokenFilter(NormalizeName, NormalizerFilterConstructor)
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}
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// Copyright (c) 2017 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 de
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import (
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"reflect"
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"testing"
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"github.com/blevesearch/bleve/analysis"
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)
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func TestGermanNormalizeFilter(t *testing.T) {
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tests := []struct {
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input analysis.TokenStream
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output analysis.TokenStream
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}{
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// Tests that a/o/u + e is equivalent to the umlaut form
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{
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input: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("Schaltflächen"),
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},
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},
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("Schaltflachen"),
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},
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},
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},
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{
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input: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("Schaltflaechen"),
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},
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},
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("Schaltflachen"),
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},
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},
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},
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// Tests the specific heuristic that ue is not folded after a vowel or q.
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{
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input: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("dauer"),
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},
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},
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("dauer"),
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},
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},
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},
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// Tests german specific folding of sharp-s
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{
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input: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("weißbier"),
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},
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},
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte("weissbier"),
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},
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},
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},
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// empty
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{
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input: analysis.TokenStream{
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&analysis.Token{
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Term: []byte(""),
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},
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},
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output: analysis.TokenStream{
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&analysis.Token{
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Term: []byte(""),
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},
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},
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},
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}
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germanNormalizeFilter := NewGermanNormalizeFilter()
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for _, test := range tests {
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actual := germanNormalizeFilter.Filter(test.input)
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if !reflect.DeepEqual(actual, test.output) {
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t.Errorf("expected %#v, got %#v", test.output, actual)
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t.Errorf("expected %s(% x), got %s(% x)", test.output[0].Term, test.output[0].Term, actual[0].Term, actual[0].Term)
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}
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}
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}
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// Copyright (c) 2017 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 de
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import (
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"bytes"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/registry"
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)
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const LightStemmerName = "stemmer_de_light"
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type GermanLightStemmerFilter struct {
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}
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func NewGermanLightStemmerFilter() *GermanLightStemmerFilter {
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return &GermanLightStemmerFilter{}
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}
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func (s *GermanLightStemmerFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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for _, token := range input {
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runes := bytes.Runes(token.Term)
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runes = stem(runes)
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token.Term = analysis.BuildTermFromRunes(runes)
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}
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return input
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}
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func stem(input []rune) []rune {
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for i, r := range input {
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switch r {
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case 'ä', 'à', 'á', 'â':
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input[i] = 'a'
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case 'ö', 'ò', 'ó', 'ô':
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input[i] = 'o'
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case 'ï', 'ì', 'í', 'î':
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input[i] = 'i'
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case 'ü', 'ù', 'ú', 'û':
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input[i] = 'u'
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}
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}
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input = step1(input)
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return step2(input)
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}
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func stEnding(ch rune) bool {
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switch ch {
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case 'b', 'd', 'f', 'g', 'h', 'k', 'l', 'm', 'n', 't':
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return true
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}
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return false
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}
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func step1(s []rune) []rune {
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l := len(s)
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if l > 5 && s[l-3] == 'e' && s[l-2] == 'r' && s[l-1] == 'n' {
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return s[:l-3]
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}
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if l > 4 && s[l-2] == 'e' {
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switch s[l-1] {
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case 'm', 'n', 'r', 's':
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return s[:l-2]
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}
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}
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if l > 3 && s[l-1] == 'e' {
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return s[:l-1]
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}
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if l > 3 && s[l-1] == 's' && stEnding(s[l-2]) {
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return s[:l-1]
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}
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return s
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}
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func step2(s []rune) []rune {
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l := len(s)
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if l > 5 && s[l-3] == 'e' && s[l-2] == 's' && s[l-1] == 't' {
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return s[:l-3]
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}
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if l > 4 && s[l-2] == 'e' && (s[l-1] == 'r' || s[l-1] == 'n') {
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return s[:l-2]
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}
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if l > 4 && s[l-2] == 's' && s[l-1] == 't' && stEnding(s[l-3]) {
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return s[:l-2]
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}
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return s
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}
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func GermanLightStemmerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewGermanLightStemmerFilter(), nil
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}
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func init() {
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registry.RegisterTokenFilter(LightStemmerName, GermanLightStemmerFilterConstructor)
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}
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@ -0,0 +1,33 @@
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// Copyright (c) 2017 Couchbase, Inc.
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||||
//
|
||||
// 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 de
|
||||
|
||||
import (
|
||||
"github.com/blevesearch/bleve/analysis"
|
||||
"github.com/blevesearch/bleve/analysis/token/stop"
|
||||
"github.com/blevesearch/bleve/registry"
|
||||
)
|
||||
|
||||
func StopTokenFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
|
||||
tokenMap, err := cache.TokenMapNamed(StopName)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return stop.NewStopTokensFilter(tokenMap), nil
|
||||
}
|
||||
|
||||
func init() {
|
||||
registry.RegisterTokenFilter(StopName, StopTokenFilterConstructor)
|
||||
}
|
|
@ -0,0 +1,318 @@
|
|||
package de
|
||||
|
||||
import (
|
||||
"github.com/blevesearch/bleve/analysis"
|
||||
"github.com/blevesearch/bleve/registry"
|
||||
)
|
||||
|
||||
const StopName = "stop_de"
|
||||
|
||||
// this content was obtained from:
|
||||
// lucene-4.7.2/analysis/common/src/resources/org/apache/lucene/analysis/snowball/
|
||||
// ` was changed to ' to allow for literal string
|
||||
|
||||
var GermanStopWords = []byte(` | From svn.tartarus.org/snowball/trunk/website/algorithms/german/stop.txt
|
||||
| This file is distributed under the BSD License.
|
||||
| See http://snowball.tartarus.org/license.php
|
||||
| Also see http://www.opensource.org/licenses/bsd-license.html
|
||||
| - Encoding was converted to UTF-8.
|
||||
| - This notice was added.
|
||||
|
|
||||
| NOTE: To use this file with StopFilterFactory, you must specify format="snowball"
|
||||
|
||||
| A German stop word list. Comments begin with vertical bar. Each stop
|
||||
| word is at the start of a line.
|
||||
|
||||
| The number of forms in this list is reduced significantly by passing it
|
||||
| through the German stemmer.
|
||||
|
||||
|
||||
aber | but
|
||||
|
||||
alle | all
|
||||
allem
|
||||
allen
|
||||
aller
|
||||
alles
|
||||
|
||||
als | than, as
|
||||
also | so
|
||||
am | an + dem
|
||||
an | at
|
||||
|
||||
ander | other
|
||||
andere
|
||||
anderem
|
||||
anderen
|
||||
anderer
|
||||
anderes
|
||||
anderm
|
||||
andern
|
||||
anderr
|
||||
anders
|
||||
|
||||
auch | also
|
||||
auf | on
|
||||
aus | out of
|
||||
bei | by
|
||||
bin | am
|
||||
bis | until
|
||||
bist | art
|
||||
da | there
|
||||
damit | with it
|
||||
dann | then
|
||||
|
||||
der | the
|
||||
den
|
||||
des
|
||||
dem
|
||||
die
|
||||
das
|
||||
|
||||
daß | that
|
||||
|
||||
derselbe | the same
|
||||
derselben
|
||||
denselben
|
||||
desselben
|
||||
demselben
|
||||
dieselbe
|
||||
dieselben
|
||||
dasselbe
|
||||
|
||||
dazu | to that
|
||||
|
||||
dein | thy
|
||||
deine
|
||||
deinem
|
||||
deinen
|
||||
deiner
|
||||
deines
|
||||
|
||||
denn | because
|
||||
|
||||
derer | of those
|
||||
dessen | of him
|
||||
|
||||
dich | thee
|
||||
dir | to thee
|
||||
du | thou
|
||||
|
||||
dies | this
|
||||
diese
|
||||
diesem
|
||||
diesen
|
||||
dieser
|
||||
dieses
|
||||
|
||||
|
||||
doch | (several meanings)
|
||||
dort | (over) there
|
||||
|
||||
|
||||
durch | through
|
||||
|
||||
ein | a
|
||||
eine
|
||||
einem
|
||||
einen
|
||||
einer
|
||||
eines
|
||||
|
||||
einig | some
|
||||
einige
|
||||
einigem
|
||||
einigen
|
||||
einiger
|
||||
einiges
|
||||
|
||||
einmal | once
|
||||
|
||||
er | he
|
||||
ihn | him
|
||||
ihm | to him
|
||||
|
||||
es | it
|
||||
etwas | something
|
||||
|
||||
euer | your
|
||||
eure
|
||||
eurem
|
||||
euren
|
||||
eurer
|
||||
eures
|
||||
|
||||
für | for
|
||||
gegen | towards
|
||||
gewesen | p.p. of sein
|
||||
hab | have
|
||||
habe | have
|
||||
haben | have
|
||||
hat | has
|
||||
hatte | had
|
||||
hatten | had
|
||||
hier | here
|
||||
hin | there
|
||||
hinter | behind
|
||||
|
||||
ich | I
|
||||
mich | me
|
||||
mir | to me
|
||||
|
||||
|
||||
ihr | you, to her
|
||||
ihre
|
||||
ihrem
|
||||
ihren
|
||||
ihrer
|
||||
ihres
|
||||
euch | to you
|
||||
|
||||
im | in + dem
|
||||
in | in
|
||||
indem | while
|
||||
ins | in + das
|
||||
ist | is
|
||||
|
||||
jede | each, every
|
||||
jedem
|
||||
jeden
|
||||
jeder
|
||||
jedes
|
||||
|
||||
jene | that
|
||||
jenem
|
||||
jenen
|
||||
jener
|
||||
jenes
|
||||
|
||||
jetzt | now
|
||||
kann | can
|
||||
|
||||
kein | no
|
||||
keine
|
||||
keinem
|
||||
keinen
|
||||
keiner
|
||||
keines
|
||||
|
||||
können | can
|
||||
könnte | could
|
||||
machen | do
|
||||
man | one
|
||||
|
||||
manche | some, many a
|
||||
manchem
|
||||
manchen
|
||||
mancher
|
||||
manches
|
||||
|
||||
mein | my
|
||||
meine
|
||||
meinem
|
||||
meinen
|
||||
meiner
|
||||
meines
|
||||
|
||||
mit | with
|
||||
muss | must
|
||||
musste | had to
|
||||
nach | to(wards)
|
||||
nicht | not
|
||||
nichts | nothing
|
||||
noch | still, yet
|
||||
nun | now
|
||||
nur | only
|
||||
ob | whether
|
||||
oder | or
|
||||
ohne | without
|
||||
sehr | very
|
||||
|
||||
sein | his
|
||||
seine
|
||||
seinem
|
||||
seinen
|
||||
seiner
|
||||
seines
|
||||
|
||||
selbst | self
|
||||
sich | herself
|
||||
|
||||
sie | they, she
|
||||
ihnen | to them
|
||||
|
||||
sind | are
|
||||
so | so
|
||||
|
||||
solche | such
|
||||
solchem
|
||||
solchen
|
||||
solcher
|
||||
solches
|
||||
|
||||
soll | shall
|
||||
sollte | should
|
||||
sondern | but
|
||||
sonst | else
|
||||
über | over
|
||||
um | about, around
|
||||
und | and
|
||||
|
||||
uns | us
|
||||
unse
|
||||
unsem
|
||||
unsen
|
||||
unser
|
||||
unses
|
||||
|
||||
unter | under
|
||||
viel | much
|
||||
vom | von + dem
|
||||
von | from
|
||||
vor | before
|
||||
während | while
|
||||
war | was
|
||||
waren | were
|
||||
warst | wast
|
||||
was | what
|
||||
weg | away, off
|
||||
weil | because
|
||||
weiter | further
|
||||
|
||||
welche | which
|
||||
welchem
|
||||
welchen
|
||||
welcher
|
||||
welches
|
||||
|
||||
wenn | when
|
||||
werde | will
|
||||
werden | will
|
||||
wie | how
|
||||
wieder | again
|
||||
will | want
|
||||
wir | we
|
||||
wird | will
|
||||
wirst | willst
|
||||
wo | where
|
||||
wollen | want
|
||||
wollte | wanted
|
||||
würde | would
|
||||
würden | would
|
||||
zu | to
|
||||
zum | zu + dem
|
||||
zur | zu + der
|
||||
zwar | indeed
|
||||
zwischen | between
|
||||
|
||||
`)
|
||||
|
||||
func TokenMapConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenMap, error) {
|
||||
rv := analysis.NewTokenMap()
|
||||
err := rv.LoadBytes(GermanStopWords)
|
||||
return rv, err
|
||||
}
|
||||
|
||||
func init() {
|
||||
registry.RegisterTokenMap(StopName, TokenMapConstructor)
|
||||
}
|
Loading…
Reference in New Issue