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vendor/github.com/blevesearch/bleve/analysis/tokenizers/icu/boundary.go

@@ -0,0 +1,138 @@
+//  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.
+
+// +build icu full
+
+package icu
+
+// #cgo LDFLAGS: -licuuc -licudata
+// #include <stdio.h>
+// #include <stdlib.h>
+// #include "unicode/utypes.h"
+// #include "unicode/uchar.h"
+// #include "unicode/ubrk.h"
+// #include "unicode/ustring.h"
+import "C"
+
+import (
+	"unsafe"
+
+	"github.com/blevesearch/bleve/analysis"
+	"github.com/blevesearch/bleve/registry"
+)
+
+const Name = "icu"
+
+type UnicodeWordBoundaryTokenizer struct {
+	locale *C.char
+}
+
+func NewUnicodeWordBoundaryTokenizer() *UnicodeWordBoundaryTokenizer {
+	return &UnicodeWordBoundaryTokenizer{}
+}
+
+func NewUnicodeWordBoundaryCustomLocaleTokenizer(locale string) *UnicodeWordBoundaryTokenizer {
+	return &UnicodeWordBoundaryTokenizer{
+		locale: C.CString(locale),
+	}
+}
+
+func (t *UnicodeWordBoundaryTokenizer) Tokenize(input []byte) analysis.TokenStream {
+	rv := make(analysis.TokenStream, 0)
+
+	if len(input) < 1 {
+		return rv
+	}
+
+	// works
+	var myUnsafePointer = unsafe.Pointer(&(input[0]))
+	var myCCharPointer *C.char = (*C.char)(myUnsafePointer)
+
+	var inlen C.int32_t = C.int32_t(len(input))
+	var buflen C.int32_t = C.int32_t(2*len(input) + 1) // worse case each byte becomes 2
+	var stringToExamine []C.UChar = make([]C.UChar, buflen)
+	var myUnsafePointerToExamine = unsafe.Pointer(&(stringToExamine[0]))
+	var myUCharPointer *C.UChar = (*C.UChar)(myUnsafePointerToExamine)
+	C.u_uastrncpy(myUCharPointer, myCCharPointer, inlen)
+
+	var err C.UErrorCode = C.U_ZERO_ERROR
+	bi := C.ubrk_open(C.UBRK_WORD, t.locale, myUCharPointer, -1, &err)
+
+	if err > C.U_ZERO_ERROR {
+		return rv
+	}
+
+	defer C.ubrk_close(bi)
+
+	position := 0
+	var prev C.int32_t
+	p := C.ubrk_first(bi)
+	for p != C.UBRK_DONE {
+
+		q := C.ubrk_getRuleStatus(bi)
+
+		// convert boundaries back to utf8 positions
+		var nilCString *C.char
+		var indexA C.int32_t
+
+		C.u_strToUTF8(nilCString, 0, &indexA, myUCharPointer, prev, &err)
+		if err > C.U_ZERO_ERROR && err != C.U_BUFFER_OVERFLOW_ERROR {
+			return rv
+		} else {
+			err = C.U_ZERO_ERROR
+		}
+
+		var indexB C.int32_t
+		C.u_strToUTF8(nilCString, 0, &indexB, myUCharPointer, p, &err)
+		if err > C.U_ZERO_ERROR && err != C.U_BUFFER_OVERFLOW_ERROR {
+			return rv
+		} else {
+			err = C.U_ZERO_ERROR
+		}
+
+		if q != 0 {
+			position += 1
+			token := analysis.Token{
+				Start:    int(indexA),
+				End:      int(indexB),
+				Term:     input[indexA:indexB],
+				Position: position,
+				Type:     analysis.AlphaNumeric,
+			}
+			if q == 100 {
+				token.Type = analysis.Numeric
+			}
+			if q == 400 {
+				token.Type = analysis.Ideographic
+			}
+			rv = append(rv, &token)
+		}
+		prev = p
+		p = C.ubrk_next(bi)
+	}
+
+	return rv
+}
+
+func UnicodeWordBoundaryTokenizerConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.Tokenizer, error) {
+	locale := ""
+	localeVal, ok := config["locale"].(string)
+	if ok {
+		locale = localeVal
+	}
+	if locale == "" {
+		return NewUnicodeWordBoundaryTokenizer(), nil
+	} else {
+		return NewUnicodeWordBoundaryCustomLocaleTokenizer(locale), nil
+	}
+}
+
+func init() {
+	registry.RegisterTokenizer(Name, UnicodeWordBoundaryTokenizerConstructor)
+}