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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (C) 2001-2011, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* Date Name Description
* 06/06/01 aliu Creation.
**********************************************************************
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_TRANSLITERATION
#include "unicode/unifilt.h"
#include "unicode/uchar.h"
#include "unicode/utf16.h"
#include "uni2name.h"
#include "cstring.h"
#include "cmemory.h"
#include "uprops.h"
U_NAMESPACE_BEGIN
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
static const UChar CLOSE_DELIM = 125; // "}"
#define OPEN_DELIM_LEN 3
/**
* Constructs a transliterator.
*/
UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
}
/**
* Destructor.
*/
UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
/**
* Copy constructor.
*/
UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
Transliterator(o) {}
/**
* Assignment operator.
*/
/*UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
const UnicodeNameTransliterator& o) {
Transliterator::operator=(o);
return *this;
}*/
/**
* Transliterator API.
*/
UnicodeNameTransliterator* UnicodeNameTransliterator::clone() const {
return new UnicodeNameTransliterator(*this);
}
/**
* Implements {@link Transliterator#handleTransliterate}.
* Ignore isIncremental since we don't need the context, and
* we work on codepoints.
*/
void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
UBool /*isIncremental*/) const {
// The failure mode, here and below, is to behave like Any-Null,
// if either there is no name data (max len == 0) or there is no
// memory (malloc() => NULL).
int32_t maxLen = uprv_getMaxCharNameLength();
if (maxLen == 0) {
offsets.start = offsets.limit;
return;
}
// Accommodate the longest possible name plus padding
char* buf = (char*) uprv_malloc(maxLen);
if (buf == NULL) {
offsets.start = offsets.limit;
return;
}
int32_t cursor = offsets.start;
int32_t limit = offsets.limit;
UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
UErrorCode status;
int32_t len;
while (cursor < limit) {
UChar32 c = text.char32At(cursor);
int32_t clen = U16_LENGTH(c);
status = U_ZERO_ERROR;
if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
str.truncate(OPEN_DELIM_LEN);
str.append(UnicodeString(buf, len, US_INV)).append(CLOSE_DELIM);
text.handleReplaceBetween(cursor, cursor+clen, str);
len += OPEN_DELIM_LEN + 1; // adjust for delimiters
cursor += len; // advance cursor and adjust for new text
limit += len-clen; // change in length
} else {
cursor += clen;
}
}
offsets.contextLimit += limit - offsets.limit;
offsets.limit = limit;
offsets.start = cursor;
uprv_free(buf);
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_TRANSLITERATION */
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