#include "unicode/utypes.h"
#if !UCONFIG_NO_TRANSLITERATION
#include "unicode/uchar.h"
#include "unicode/ustring.h"
#include "tolowtrn.h"
#include "ustr_imp.h"
#include "cpputils.h"
U_NAMESPACE_BEGIN
const char LowercaseTransliterator::fgClassID=0;
const char LowercaseTransliterator::_ID[] = "Any-Lower";
LowercaseTransliterator::LowercaseTransliterator(const Locale& theLoc) : Transliterator(_ID, 0),
loc(theLoc) , buffer(0)
{
buffer = (UChar *)uprv_malloc(u_getMaxCaseExpansion()*sizeof(buffer[0]));
}
LowercaseTransliterator::~LowercaseTransliterator() {
uprv_free(buffer);
}
LowercaseTransliterator::LowercaseTransliterator(const LowercaseTransliterator& o) :
Transliterator(o),
loc(o.loc), buffer(0)
{
buffer = (UChar *)uprv_malloc(u_getMaxCaseExpansion()*sizeof(buffer[0]));
}
LowercaseTransliterator& LowercaseTransliterator::operator=(
const LowercaseTransliterator& o) {
Transliterator::operator=(o);
loc = o.loc;
uprv_arrayCopy((const UChar*)o.buffer, 0, this->buffer, 0, u_getMaxCaseExpansion());
return *this;
}
Transliterator* LowercaseTransliterator::clone(void) const {
return new LowercaseTransliterator(*this);
}
void LowercaseTransliterator::handleTransliterate(Replaceable& text,
UTransPosition& offsets,
UBool isIncremental) const
{
int32_t textPos = offsets.start;
if (textPos >= offsets.limit) return;
UnicodeString original;
text.extractBetween(offsets.contextStart, offsets.contextLimit, original);
UCharIterator iter;
uiter_setReplaceable(&iter, &text);
iter.start = offsets.contextStart;
iter.limit = offsets.contextLimit;
int32_t i = textPos - offsets.contextStart;
int32_t limit = offsets.limit - offsets.contextStart;
UChar32 cp;
int32_t oldLen;
for (; i < limit; ) {
UTF_GET_CHAR(original.getBuffer(), 0, i, original.length(), cp);
oldLen = UTF_CHAR_LENGTH(cp);
i += oldLen;
iter.index = i; int32_t newLen = u_internalToLower(cp, &iter, buffer, u_getMaxCaseExpansion(), loc.getName());
if (newLen >= 0) {
UnicodeString temp(buffer, newLen);
text.handleReplaceBetween(textPos, textPos + oldLen, temp);
if (newLen != oldLen) {
textPos += newLen;
offsets.limit += newLen - oldLen;
offsets.contextLimit += newLen - oldLen;
continue;
}
}
textPos += oldLen;
}
offsets.start = offsets.limit;
}
U_NAMESPACE_END
#endif