SurrogatePairAwareTextIterator.cpp [plain text]
#include "config.h"
#include "SurrogatePairAwareTextIterator.h"
#include <unicode/unorm.h>
namespace WebCore {
SurrogatePairAwareTextIterator::SurrogatePairAwareTextIterator(const UChar* characters, unsigned currentIndex, unsigned lastIndex, unsigned endIndex)
: m_characters(characters)
, m_currentIndex(currentIndex)
, m_lastIndex(lastIndex)
, m_endIndex(endIndex)
{
}
bool SurrogatePairAwareTextIterator::consumeSlowCase(UChar32& character, unsigned& clusterLength)
{
if (character <= 0x30FE) {
if (UChar32 normalized = normalizeVoicingMarks()) {
character = normalized;
clusterLength = 2;
}
return true;
}
if (!U16_IS_SURROGATE(character))
return true;
if (!U16_IS_SURROGATE_LEAD(character))
return false;
if (m_currentIndex + 1 >= m_endIndex)
return false;
UChar low = m_characters[1];
if (!U16_IS_TRAIL(low))
return false;
character = U16_GET_SUPPLEMENTARY(character, low);
clusterLength = 2;
return true;
}
#if COMPILER(GCC_OR_CLANG)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
UChar32 SurrogatePairAwareTextIterator::normalizeVoicingMarks()
{
static const uint8_t hiraganaKatakanaVoicingMarksCombiningClass = 8;
if (m_currentIndex + 1 >= m_endIndex)
return 0;
if (u_getCombiningClass(m_characters[1]) == hiraganaKatakanaVoicingMarksCombiningClass) {
UChar normalizedCharacters[2] = { 0, 0 };
UErrorCode uStatus = U_ZERO_ERROR;
int32_t resultLength = unorm_normalize(m_characters, 2, UNORM_NFC, UNORM_UNICODE_3_2, &normalizedCharacters[0], 2, &uStatus);
if (resultLength == 1 && !uStatus)
return normalizedCharacters[0];
}
return 0;
}
#if COMPILER(GCC_OR_CLANG)
#pragma GCC diagnostic pop
#endif
}