68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
// 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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// +build cld2 full
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package cld2
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// #cgo LDFLAGS: -lcld2_full
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// #include "cld2_filter.h"
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// #include <string.h>
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import "C"
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import (
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"unsafe"
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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 Name = "detect_lang"
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type Cld2Filter struct {
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}
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func NewCld2Filter() *Cld2Filter {
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return &Cld2Filter{}
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}
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func (f *Cld2Filter) Filter(input analysis.TokenStream) analysis.TokenStream {
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rv := make(analysis.TokenStream, 0, len(input))
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offset := 0
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for _, token := range input {
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var err error
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token.Term, err = f.detectLanguage(token.Term)
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if err != nil {
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token.Term = []byte("error")
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}
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token.Start = offset
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token.End = token.Start + len(token.Term)
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token.Type = analysis.AlphaNumeric
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rv = append(rv, token)
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offset = token.End + 1
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}
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return rv
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}
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func (f *Cld2Filter) detectLanguage(input []byte) ([]byte, error) {
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cstr := C.CString(string(input))
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res := C.DetectLang(cstr)
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return C.GoBytes(unsafe.Pointer(res), C.int(C.strlen(res))), nil
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}
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func Cld2FilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
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return NewCld2Filter(), nil
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}
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func init() {
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registry.RegisterTokenFilter(Name, Cld2FilterConstructor)
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}
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