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// 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 unicodenorm
import (
"fmt"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/registry"
"golang.org/x/text/unicode/norm"
)
const Name = "normalize_unicode"
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.NFKD,
}
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 {
for _, token := range input {
token.Term = s.form.Bytes(token.Term)
}
return input
}
func UnicodeNormalizeFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
formVal, ok := config["form"].(string)
if !ok {
return nil, fmt.Errorf("must specify form")
}
form := formVal
return NewUnicodeNormalizeFilter(form)
}
func init() {
registry.RegisterTokenFilter(Name, UnicodeNormalizeFilterConstructor)
}
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