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SFML/include/SFML/System/Utf.inl

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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// References :
//
// http://www.unicode.org/
// http://www.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.c
// http://www.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.h
// http://people.w3.org/rishida/scripts/uniview/conversion
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
template <typename In>
In Utf<8>::Decode(In begin, In end, Uint32& output, Uint32 replacement)
{
// Some useful precomputed data
static const int trailing[256] =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5
};
static const Uint32 offsets[6] =
{
0x00000000, 0x00003080, 0x000E2080, 0x03C82080, 0xFA082080, 0x82082080
};
// Decode the character
int trailingBytes = trailing[static_cast<Uint8>(*begin)];
if (begin + trailingBytes < end)
{
output = 0;
switch (trailingBytes)
{
case 5 : output += static_cast<Uint8>(*begin++); output <<= 6;
case 4 : output += static_cast<Uint8>(*begin++); output <<= 6;
case 3 : output += static_cast<Uint8>(*begin++); output <<= 6;
case 2 : output += static_cast<Uint8>(*begin++); output <<= 6;
case 1 : output += static_cast<Uint8>(*begin++); output <<= 6;
case 0 : output += static_cast<Uint8>(*begin++);
}
output -= offsets[trailingBytes];
}
else
{
// Incomplete character
begin = end;
output = replacement;
}
return begin;
}
////////////////////////////////////////////////////////////
template <typename Out>
Out Utf<8>::Encode(Uint32 input, Out output, Uint8 replacement)
{
// Some useful precomputed data
static const Uint8 firstBytes[7] =
{
0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC
};
// Encode the character
if ((input > 0x0010FFFF) || ((input >= 0xD800) && (input <= 0xDBFF)))
{
// Invalid character
if (replacement)
*output++ = replacement;
}
else
{
// Valid character
// Get the number of bytes to write
int bytesToWrite = 1;
if (input < 0x80) bytesToWrite = 1;
else if (input < 0x800) bytesToWrite = 2;
else if (input < 0x10000) bytesToWrite = 3;
else if (input <= 0x0010FFFF) bytesToWrite = 4;
// Extract the bytes to write
Uint8 bytes[4];
switch (bytesToWrite)
{
case 4 : bytes[3] = static_cast<Uint8>((input | 0x80) & 0xBF); input >>= 6;
case 3 : bytes[2] = static_cast<Uint8>((input | 0x80) & 0xBF); input >>= 6;
case 2 : bytes[1] = static_cast<Uint8>((input | 0x80) & 0xBF); input >>= 6;
case 1 : bytes[0] = static_cast<Uint8> (input | firstBytes[bytesToWrite]);
}
// Add them to the output
const Uint8* currentByte = bytes;
switch (bytesToWrite)
{
case 4 : *output++ = *currentByte++;
case 3 : *output++ = *currentByte++;
case 2 : *output++ = *currentByte++;
case 1 : *output++ = *currentByte++;
}
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In>
In Utf<8>::Next(In begin, In end)
{
Uint32 codepoint;
return Decode(begin, end, codepoint);
}
////////////////////////////////////////////////////////////
template <typename In>
std::size_t Utf<8>::Count(In begin, In end)
{
std::size_t length = 0;
while (begin < end)
{
begin = Next(begin, end);
++length;
}
return length;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::FromAnsi(In begin, In end, Out output, const std::locale& locale)
{
while (begin < end)
{
Uint32 codepoint = Utf<32>::DecodeAnsi(*begin++, locale);
output = Encode(codepoint, output);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::FromWide(In begin, In end, Out output)
{
while (begin < end)
{
Uint32 codepoint = Utf<32>::DecodeWide(*begin++);
output = Encode(codepoint, output);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::FromLatin1(In begin, In end, Out output)
{
// Latin-1 is directly compatible with Unicode encodings,
// and can thus be treated as (a sub-range of) UTF-32
while (begin < end)
output = Encode(*begin++, output);
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::ToAnsi(In begin, In end, Out output, char replacement, const std::locale& locale)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
output = Utf<32>::EncodeAnsi(codepoint, output, replacement, locale);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::ToWide(In begin, In end, Out output, wchar_t replacement)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
output = Utf<32>::EncodeWide(codepoint, output, replacement);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::ToLatin1(In begin, In end, Out output, char replacement)
{
// Latin-1 is directly compatible with Unicode encodings,
// and can thus be treated as (a sub-range of) UTF-32
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
*output++ = codepoint < 256 ? static_cast<char>(codepoint) : replacement;
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::ToUtf8(In begin, In end, Out output)
{
while (begin < end)
*output++ = *begin++;
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::ToUtf16(In begin, In end, Out output)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
output = Utf<16>::Encode(codepoint, output);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<8>::ToUtf32(In begin, In end, Out output)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
*output++ = codepoint;
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In>
In Utf<16>::Decode(In begin, In end, Uint32& output, Uint32 replacement)
{
Uint16 first = *begin++;
// If it's a surrogate pair, first convert to a single UTF-32 character
if ((first >= 0xD800) && (first <= 0xDBFF))
{
if (begin < end)
{
Uint32 second = *begin++;
if ((second >= 0xDC00) && (second <= 0xDFFF))
{
// The second element is valid: convert the two elements to a UTF-32 character
output = static_cast<Uint32>(((first - 0xD800) << 10) + (second - 0xDC00) + 0x0010000);
}
else
{
// Invalid character
output = replacement;
}
}
else
{
// Invalid character
begin = end;
output = replacement;
}
}
else
{
// We can make a direct copy
output = first;
}
return begin;
}
////////////////////////////////////////////////////////////
template <typename Out>
Out Utf<16>::Encode(Uint32 input, Out output, Uint16 replacement)
{
if (input < 0xFFFF)
{
// The character can be copied directly, we just need to check if it's in the valid range
if ((input >= 0xD800) && (input <= 0xDFFF))
{
// Invalid character (this range is reserved)
if (replacement)
*output++ = replacement;
}
else
{
// Valid character directly convertible to a single UTF-16 character
*output++ = static_cast<Uint16>(input);
}
}
else if (input > 0x0010FFFF)
{
// Invalid character (greater than the maximum unicode value)
if (replacement)
*output++ = replacement;
}
else
{
// The input character will be converted to two UTF-16 elements
input -= 0x0010000;
*output++ = static_cast<Uint16>((input >> 10) + 0xD800);
*output++ = static_cast<Uint16>((input & 0x3FFUL) + 0xDC00);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In>
In Utf<16>::Next(In begin, In end)
{
Uint32 codepoint;
return Decode(begin, end, codepoint);
}
////////////////////////////////////////////////////////////
template <typename In>
std::size_t Utf<16>::Count(In begin, In end)
{
std::size_t length = 0;
while (begin < end)
{
begin = Next(begin, end);
++length;
}
return length;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::FromAnsi(In begin, In end, Out output, const std::locale& locale)
{
while (begin < end)
{
Uint32 codepoint = Utf<32>::DecodeAnsi(*begin++, locale);
output = Encode(codepoint, output);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::FromWide(In begin, In end, Out output)
{
while (begin < end)
{
Uint32 codepoint = Utf<32>::DecodeWide(*begin++);
output = Encode(codepoint, output);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::FromLatin1(In begin, In end, Out output)
{
// Latin-1 is directly compatible with Unicode encodings,
// and can thus be treated as (a sub-range of) UTF-32
while (begin < end)
*output++ = *begin++;
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::ToAnsi(In begin, In end, Out output, char replacement, const std::locale& locale)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
output = Utf<32>::EncodeAnsi(codepoint, output, replacement, locale);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::ToWide(In begin, In end, Out output, wchar_t replacement)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
output = Utf<32>::EncodeWide(codepoint, output, replacement);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::ToLatin1(In begin, In end, Out output, char replacement)
{
// Latin-1 is directly compatible with Unicode encodings,
// and can thus be treated as (a sub-range of) UTF-32
while (begin < end)
{
*output++ = *begin < 256 ? static_cast<char>(*begin) : replacement;
begin++;
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::ToUtf8(In begin, In end, Out output)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
output = Utf<8>::Encode(codepoint, output);
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::ToUtf16(In begin, In end, Out output)
{
while (begin < end)
*output++ = *begin++;
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<16>::ToUtf32(In begin, In end, Out output)
{
while (begin < end)
{
Uint32 codepoint;
begin = Decode(begin, end, codepoint);
*output++ = codepoint;
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In>
In Utf<32>::Decode(In begin, In end, Uint32& output, Uint32)
{
output = *begin++;
return begin;
}
////////////////////////////////////////////////////////////
template <typename Out>
Out Utf<32>::Encode(Uint32 input, Out output, Uint32 replacement)
{
*output++ = input;
return output;
}
////////////////////////////////////////////////////////////
template <typename In>
In Utf<32>::Next(In begin, In end)
{
return ++begin;
}
////////////////////////////////////////////////////////////
template <typename In>
std::size_t Utf<32>::Count(In begin, In end)
{
return begin - end;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::FromAnsi(In begin, In end, Out output, const std::locale& locale)
{
while (begin < end)
*output++ = DecodeAnsi(*begin++, locale);
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::FromWide(In begin, In end, Out output)
{
while (begin < end)
*output++ = DecodeWide(*begin++);
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::FromLatin1(In begin, In end, Out output)
{
// Latin-1 is directly compatible with Unicode encodings,
// and can thus be treated as (a sub-range of) UTF-32
while (begin < end)
*output++ = *begin++;
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::ToAnsi(In begin, In end, Out output, char replacement, const std::locale& locale)
{
while (begin < end)
output = EncodeAnsi(*begin++, output, replacement, locale);
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::ToWide(In begin, In end, Out output, wchar_t replacement)
{
while (begin < end)
output = EncodeWide(*begin++, output, replacement);
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::ToLatin1(In begin, In end, Out output, char replacement)
{
// Latin-1 is directly compatible with Unicode encodings,
// and can thus be treated as (a sub-range of) UTF-32
while (begin < end)
{
*output++ = *begin < 256 ? static_cast<char>(*begin) : replacement;
begin++;
}
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::ToUtf8(In begin, In end, Out output)
{
while (begin < end)
output = Utf<8>::Encode(*begin++, output);
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::ToUtf16(In begin, In end, Out output)
{
while (begin < end)
output = Utf<16>::Encode(*begin++, output);
return output;
}
////////////////////////////////////////////////////////////
template <typename In, typename Out>
Out Utf<32>::ToUtf32(In begin, In end, Out output)
{
while (begin < end)
*output++ = *begin++;
return output;
}
////////////////////////////////////////////////////////////
template <typename In>
Uint32 Utf<32>::DecodeAnsi(In input, const std::locale& locale)
{
// On Windows, gcc's standard library (glibc++) has almost
// no support for Unicode stuff. As a consequence, in this
// context we can only use the default locale and ignore
// the one passed as parameter.
#if defined(SFML_SYSTEM_WINDOWS) && /* if Windows ... */ \
(defined(__GLIBCPP__) || defined (__GLIBCXX__)) && /* ... and standard library is glibc++ ... */ \
!(defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)) /* ... and STLPort is not used on top of it */
wchar_t character = 0;
mbtowc(&character, &input, 1);
return static_cast<Uint32>(character);
#else
// Get the facet of the locale which deals with character conversion
const std::ctype<wchar_t>& facet = std::use_facet< std::ctype<wchar_t> >(locale);
// Use the facet to convert each character of the input string
return static_cast<Uint32>(facet.widen(input));
#endif
}
////////////////////////////////////////////////////////////
template <typename In>
Uint32 Utf<32>::DecodeWide(In input)
{
// The encoding of wide characters is not well defined and is left to the system;
// however we can safely assume that it is UCS-2 on Windows and
// UCS-4 on Unix systems.
// In both cases, a simple copy is enough (UCS-2 is a subset of UCS-4,
// and UCS-4 *is* UTF-32).
return input;
}
////////////////////////////////////////////////////////////
template <typename Out>
Out Utf<32>::EncodeAnsi(Uint32 codepoint, Out output, char replacement, const std::locale& locale)
{
// On Windows, gcc's standard library (glibc++) has almost
// no support for Unicode stuff. As a consequence, in this
// context we can only use the default locale and ignore
// the one passed as parameter.
#if defined(SFML_SYSTEM_WINDOWS) && /* if Windows ... */ \
(defined(__GLIBCPP__) || defined (__GLIBCXX__)) && /* ... and standard library is glibc++ ... */ \
!(defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)) /* ... and STLPort is not used on top of it */
char character = 0;
if (wctomb(&character, static_cast<wchar_t>(codepoint)) >= 0)
*output++ = character;
else if (replacement)
*output++ = replacement;
return output;
#else
// Get the facet of the locale which deals with character conversion
const std::ctype<wchar_t>& facet = std::use_facet< std::ctype<wchar_t> >(locale);
// Use the facet to convert each character of the input string
*output++ = facet.narrow(static_cast<wchar_t>(codepoint), replacement);
return output;
#endif
}
////////////////////////////////////////////////////////////
template <typename Out>
Out Utf<32>::EncodeWide(Uint32 codepoint, Out output, wchar_t replacement)
{
// The encoding of wide characters is not well defined and is left to the system;
// however we can safely assume that it is UCS-2 on Windows and
// UCS-4 on Unix systems.
// For UCS-2 we need to check if the source characters fits in (UCS-2 is a subset of UCS-4).
// For UCS-4 we can do a direct copy (UCS-4 *is* UTF-32).
switch (sizeof(wchar_t))
{
case 4:
{
*output++ = static_cast<wchar_t>(codepoint);
break;
}
default:
{
if ((codepoint <= 0xFFFF) && ((codepoint < 0xD800) || (codepoint > 0xDFFF)))
{
*output++ = static_cast<wchar_t>(codepoint);
}
else if (replacement)
{
*output++ = replacement;
}
break;
}
}
return output;
}
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