62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
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// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package unicode_normalize
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import (
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"fmt"
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"code.google.com/p/go.text/unicode/norm"
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"github.com/couchbaselabs/bleve/analysis"
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)
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const NFC = "nfc"
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const NFD = "nfd"
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const NFKC = "nfkc"
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const NFKD = "nfkd"
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var forms = map[string]norm.Form{
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NFC: norm.NFC,
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NFD: norm.NFD,
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NFKC: norm.NFKC,
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NFKD: norm.NFKC,
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}
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type UnicodeNormalizeFilter struct {
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form norm.Form
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}
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func NewUnicodeNormalizeFilter(formName string) (*UnicodeNormalizeFilter, error) {
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form, ok := forms[formName]
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if !ok {
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return nil, fmt.Errorf("no form named %s", formName)
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}
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return &UnicodeNormalizeFilter{
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form: form,
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}, nil
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}
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func MustNewUnicodeNormalizeFilter(formName string) *UnicodeNormalizeFilter {
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filter, err := NewUnicodeNormalizeFilter(formName)
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if err != nil {
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panic(err)
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}
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return filter
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}
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func (s *UnicodeNormalizeFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
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rv := make(analysis.TokenStream, 0)
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for _, token := range input {
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token.Term = s.form.Bytes(token.Term)
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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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