119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 2001, 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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* 05/24/01 aliu Creation.
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**********************************************************************
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*/
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#include "tolowtrn.h"
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#include "unicode/ustring.h"
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#include "ustr_imp.h"
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#include "cpputils.h"
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#include "unicode/uchar.h"
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U_NAMESPACE_BEGIN
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const char LowercaseTransliterator::_ID[] = "Any-Lower";
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/**
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* Constructs a transliterator.
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*/
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LowercaseTransliterator::LowercaseTransliterator(const Locale& theLoc) : Transliterator(_ID, 0),
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loc(theLoc) , buffer(0) {
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buffer = new UChar[u_getMaxCaseExpansion()];
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}
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/**
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* Destructor.
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*/
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LowercaseTransliterator::~LowercaseTransliterator() {
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delete [] buffer;
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}
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/**
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* Copy constructor.
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*/
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LowercaseTransliterator::LowercaseTransliterator(const LowercaseTransliterator& o) :
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Transliterator(o),
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loc(o.loc), buffer(0) {
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buffer = new UChar[u_getMaxCaseExpansion()];
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}
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/**
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* Assignment operator.
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*/
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LowercaseTransliterator& LowercaseTransliterator::operator=(
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const LowercaseTransliterator& o) {
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Transliterator::operator=(o);
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loc = o.loc;
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uprv_arrayCopy((const UChar*)o.buffer, 0, this->buffer, 0, u_getMaxCaseExpansion());
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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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Transliterator* LowercaseTransliterator::clone(void) const {
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return new LowercaseTransliterator(*this);
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}
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/**
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* Implements {@link Transliterator#handleTransliterate}.
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*/
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void LowercaseTransliterator::handleTransliterate(Replaceable& text,
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UTransPosition& offsets,
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UBool isIncremental) const
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{
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int32_t textPos = offsets.start;
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int32_t loop;
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if (textPos >= offsets.limit) return;
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// get string for context
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// TODO: add convenience method to do this, since we do it all over
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UnicodeString original;
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/*UChar *original = new UChar[offsets.contextLimit - offsets.contextStart+1];*/ // get whole context
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/* Extract the characters from Replaceable */
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for (loop = offsets.contextStart; loop < offsets.contextLimit; loop++) {
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original.append(text.charAt(loop));
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}
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// Walk through original string
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// If there is a case change, modify corresponding position in replaceable
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int32_t i = textPos - offsets.contextStart;
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int32_t limit = offsets.limit - offsets.contextStart;
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UChar32 cp, bufferCH;
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int32_t oldLen;
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for (; i < limit; ) {
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UErrorCode status = U_ZERO_ERROR;
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int32_t s = i;
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bufferCH = original.char32At(s);
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UTF_GET_CHAR(original.getBuffer(), 0, i, original.length(), cp);
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oldLen = UTF_CHAR_LENGTH(cp);
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i += oldLen;
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int32_t len = u_strToLower(buffer, u_getMaxCaseExpansion(), original.getBuffer()+s, i-s, loc.getName(), &status);
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/* Skip checking of status code here because the buffer should not have overflowed. */
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UTF_GET_CHAR(buffer, 0, 0, len, cp);
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if ( bufferCH != cp ) {
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UnicodeString temp(buffer);
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text.handleReplaceBetween(textPos, textPos + oldLen, temp);
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if (len != oldLen) {
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textPos += len;
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offsets.limit += len - oldLen;
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offsets.contextLimit += len - oldLen;
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continue;
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}
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}
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textPos += oldLen;
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}
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offsets.start = offsets.limit;
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}
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U_NAMESPACE_END
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