UInt32 String::GetFirstCharAt(UPInt index, const char** offset) const
{
DataDesc* pdata = GetData();
SPInt i = (SPInt) index;
const char* buf = pdata->Data;
const char* end = buf + pdata->GetSize();
UInt32 c;
do
{
c = UTF8Util::DecodeNextChar_Advance0(&buf);
i--;
if (buf >= end)
{
// We've hit the end of the string; don't go further.
OVR_ASSERT(i == 0);
return c;
}
} while (i >= 0);
*offset = buf;
return c;
}
String String::Substring(UPInt start, UPInt end) const
{
UPInt length = GetLength();
if ((start >= length) || (start >= end))
return String();
DataDesc* pdata = GetData();
// If size matches, we know the exact index range.
if (pdata->LengthIsSize())
return String(pdata->Data + start, end - start);
// Get position of starting character.
SPInt byteStart = UTF8Util::GetByteIndex(start, pdata->Data, pdata->GetSize());
SPInt byteSize = UTF8Util::GetByteIndex(end - start, pdata->Data + byteStart, pdata->GetSize()-byteStart);
return String(pdata->Data + byteStart, (UPInt)byteSize);
}
UInt32 String::GetCharAt(UPInt index) const
{
SPInt i = (SPInt) index;
DataDesc* pdata = GetData();
const char* buf = pdata->Data;
UInt32 c;
if (pdata->LengthIsSize())
{
OVR_ASSERT(index < pdata->GetSize());
buf += i;
return UTF8Util::DecodeNextChar_Advance0(&buf);
}
c = UTF8Util::GetCharAt(index, buf, pdata->GetSize());
return c;
}
void String::operator += (const String& src)
{
DataDesc *pourData = GetData(),
*psrcData = src.GetData();
UPInt ourSize = pourData->GetSize(),
srcSize = psrcData->GetSize();
UPInt lflag = pourData->GetLengthFlag() & psrcData->GetLengthFlag();
SetData(AllocDataCopy2(ourSize + srcSize, lflag,
pourData->Data, ourSize, psrcData->Data, srcSize));
pourData->Release();
}
void String::AppendString(const char* putf8str, SPInt utf8StrSz)
{
if (!putf8str || !utf8StrSz)
return;
if (utf8StrSz == -1)
utf8StrSz = (SPInt)OVR_strlen(putf8str);
DataDesc* pdata = GetData();
UPInt oldSize = pdata->GetSize();
SetData(AllocDataCopy2(oldSize + (UPInt)utf8StrSz, 0,
pdata->Data, oldSize, putf8str, (UPInt)utf8StrSz));
pdata->Release();
}
void String::AppendChar(UInt32 ch)
{
DataDesc* pdata = GetData();
UPInt size = pdata->GetSize();
char buff[8];
SPInt encodeSize = 0;
// Converts ch into UTF8 string and fills it into buff.
UTF8Util::EncodeChar(buff, &encodeSize, ch);
OVR_ASSERT(encodeSize >= 0);
SetData(AllocDataCopy2(size + (UPInt)encodeSize, 0,
pdata->Data, size, buff, (UPInt)encodeSize));
pdata->Release();
}
void String::AppendString(const wchar_t* pstr, SPInt len)
{
if (!pstr)
return;
DataDesc* pdata = GetData();
UPInt oldSize = pdata->GetSize();
UPInt encodeSize = (UPInt)UTF8Util::GetEncodeStringSize(pstr, len);
DataDesc* pnewData = AllocDataCopy1(oldSize + (UPInt)encodeSize, 0,
pdata->Data, oldSize);
UTF8Util::EncodeString(pnewData->Data + oldSize, pstr, len);
SetData(pnewData);
pdata->Release();
}
UPInt String::GetLength() const
{
// Optimize length accesses for non-UTF8 character strings.
DataDesc* pdata = GetData();
UPInt length, size = pdata->GetSize();
if (pdata->LengthIsSize())
return size;
length = (UPInt)UTF8Util::GetLength(pdata->Data, (UPInt)size);
if (length == size)
pdata->Size |= String_LengthIsSize;
return length;
}
String& String::Insert(const char* substr, UPInt posAt, SPInt strSize)
{
DataDesc* poldData = GetData();
UPInt oldSize = poldData->GetSize();
UPInt insertSize = (strSize < 0) ? OVR_strlen(substr) : (UPInt)strSize;
UPInt byteIndex = (poldData->LengthIsSize()) ?
posAt : (UPInt)UTF8Util::GetByteIndex(posAt, poldData->Data, oldSize);
OVR_ASSERT(byteIndex <= oldSize);
DataDesc* pnewData = AllocDataCopy2(oldSize + insertSize, 0,
poldData->Data, byteIndex, substr, insertSize);
memcpy(pnewData->Data + byteIndex + insertSize,
poldData->Data + byteIndex, oldSize - byteIndex);
SetData(pnewData);
poldData->Release();
return *this;
}
void String::Remove(UPInt posAt, SPInt removeLength)
{
DataDesc* pdata = GetData();
UPInt oldSize = pdata->GetSize();
// Length indicates the number of characters to remove.
UPInt length = GetLength();
// If index is past the string, nothing to remove.
if (posAt >= length)
return;
// Otherwise, cap removeLength to the length of the string.
if ((posAt + removeLength) > length)
removeLength = length - posAt;
// Get the byte position of the UTF8 char at position posAt.
SPInt bytePos = UTF8Util::GetByteIndex(posAt, pdata->Data, oldSize);
SPInt removeSize = UTF8Util::GetByteIndex(removeLength, pdata->Data + bytePos, oldSize-bytePos);
SetData(AllocDataCopy2(oldSize - removeSize, pdata->GetLengthFlag(),
pdata->Data, bytePos,
pData->Data + bytePos + removeSize, (oldSize - bytePos - removeSize)));
pdata->Release();
}