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added unicode normalization filter

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This commit is contained in:
Marty Schoch 2014-08-04 21:59:57 -04:00
parent 2c0bf23fac
commit 79ab2b9b3d
3 changed files with 224 additions and 0 deletions
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61
analysis/token_filters/unicode_normalize/unicode_normalize.go Normal file
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@ -0,0 +1,61 @@
// 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 unicode_normalize
import (
"fmt"
"code.google.com/p/go.text/unicode/norm"
"github.com/couchbaselabs/bleve/analysis"
)
const NFC = "nfc"
const NFD = "nfd"
const NFKC = "nfkc"
const NFKD = "nfkd"
var forms = map[string]norm.Form{
NFC: norm.NFC,
NFD: norm.NFD,
NFKC: norm.NFKC,
NFKD: norm.NFKC,
}
type UnicodeNormalizeFilter struct {
form norm.Form
}
func NewUnicodeNormalizeFilter(formName string) (*UnicodeNormalizeFilter, error) {
form, ok := forms[formName]
if !ok {
return nil, fmt.Errorf("no form named %s", formName)
}
return &UnicodeNormalizeFilter{
form: form,
}, nil
}
func MustNewUnicodeNormalizeFilter(formName string) *UnicodeNormalizeFilter {
filter, err := NewUnicodeNormalizeFilter(formName)
if err != nil {
panic(err)
}
return filter
}
func (s *UnicodeNormalizeFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
rv := make(analysis.TokenStream, 0)
for _, token := range input {
token.Term = s.form.Bytes(token.Term)
rv = append(rv, token)
}
return rv
}

156
analysis/token_filters/unicode_normalize/unicode_normalize_test.go Normal file
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@ -0,0 +1,156 @@
// 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 unicode_normalize
import (
"reflect"
"testing"
"github.com/couchbaselabs/bleve/analysis"
)
// the following tests come from the lucene
// test cases for CJK width filter
// which is our bases for using this
// as a substitute for that
func TestUnicodeNormalization(t *testing.T) {
tests := []struct {
formName string
input analysis.TokenStream
output analysis.TokenStream
}{
{
formName: NFKD,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("Ｔｅｓｔ"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("Test"),
},
},
},
{
formName: NFKD,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("１２３４"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("1234"),
},
},
},
{
formName: NFKD,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("ｶﾀｶﾅ"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("カタカナ"),
},
},
},
{
formName: NFKD,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("ｳﾞｨｯﾂ"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("ヴィッツ"),
},
},
},
{
formName: NFKD,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("ﾊﾟﾅｿﾆｯｸ"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("パナソニック"),
},
},
},
{
formName: NFD,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("\u212B"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("\u0041\u030A"),
},
},
},
{
formName: NFC,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("\u212B"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("\u00C5"),
},
},
},
{
formName: NFKD,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("\uFB01"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("\u0066\u0069"),
},
},
},
{
formName: NFKC,
input: analysis.TokenStream{
&analysis.Token{
Term: []byte("\uFB01"),
},
},
output: analysis.TokenStream{
&analysis.Token{
Term: []byte("\u0066\u0069"),
},
},
},
}
for _, test := range tests {
filter := MustNewUnicodeNormalizeFilter(test.formName)
actual := filter.Filter(test.input)
if !reflect.DeepEqual(actual, test.output) {
t.Errorf("expected %s, got %s", test.output[0].Term, actual[0].Term)
t.Errorf("expected %#v, got %#v", test.output[0].Term, actual[0].Term)
}
}
}

7
config.go
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@ -29,6 +29,7 @@ import (
"github.com/couchbaselabs/bleve/analysis/token_filters/lower_case_filter"
"github.com/couchbaselabs/bleve/analysis/token_filters/stemmer_filter"
"github.com/couchbaselabs/bleve/analysis/token_filters/stop_words_filter"
"github.com/couchbaselabs/bleve/analysis/token_filters/unicode_normalize"
"github.com/couchbaselabs/bleve/search"
)
@ -262,6 +263,12 @@ func init() {
Config.Analysis.TokenFilters["elision_ga"] = elision_filter.NewElisionFilter(
Config.Analysis.TokenMaps["ga_articles"])
// register unicode normalizers
Config.Analysis.TokenFilters["normalize_nfc"] = unicode_normalize.MustNewUnicodeNormalizeFilter(unicode_normalize.NFC)
Config.Analysis.TokenFilters["normalize_nfd"] = unicode_normalize.MustNewUnicodeNormalizeFilter(unicode_normalize.NFD)
Config.Analysis.TokenFilters["normalize_nfkc"] = unicode_normalize.MustNewUnicodeNormalizeFilter(unicode_normalize.NFKC)
Config.Analysis.TokenFilters["normalize_nfkd"] = unicode_normalize.MustNewUnicodeNormalizeFilter(unicode_normalize.NFKD)
// register analyzers
keywordAnalyzer := Config.MustBuildNewAnalyzer([]string{}, "single", []string{})
Config.Analysis.Analyzers["keyword"] = keywordAnalyzer