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