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#pragma once
#include "BasicTypes.h"
#include "WAVM/Inline/Assert.h"
namespace WAVM { namespace Unicode {
template<typename String> void encodeUTF8CodePoint(U32 codePoint, String& outString)
{
if(codePoint < 0x80) { outString += char(codePoint); }
else if(codePoint < 0x800)
{
outString += char((codePoint >> 6) & 0x1F) | 0xC0;
outString += char((codePoint)&0x3F) | 0x80;
}
else if(codePoint < 0x10000)
{
outString += char((codePoint >> 12) & 0x0F) | 0xE0;
outString += char((codePoint >> 6) & 0x3F) | 0x80;
outString += char((codePoint)&0x3F) | 0x80;
}
else
{
WAVM_ASSERT(codePoint < 0x200000);
outString += char((codePoint >> 18) & 0x07) | 0xF0;
outString += char((codePoint >> 12) & 0x3F) | 0x80;
outString += char((codePoint >> 6) & 0x3F) | 0x80;
outString += char((codePoint)&0x3F) | 0x80;
}
}
inline bool decodeUTF8CodePoint(const U8*& nextChar, const U8* endChar, U32& outCodePoint)
{
// Decode a UTF-8 byte sequence to a Unicode codepoint.
// The valid ranges are taken from table 3-7 in the Unicode Standard 9.0:
// "Well-Formed UTF-8 Byte Sequences"
if(*nextChar < 0x80)
{
outCodePoint = *nextChar;
++nextChar;
return true;
}
else if(*nextChar >= 0xc2 && *nextChar <= 0xdf)
{
if(nextChar + 1 >= endChar || nextChar[1] < 0x80 || nextChar[1] > 0xbf)
{ return false; }
outCodePoint = (U32(nextChar[0] & 0x1F) << 6) | U32(nextChar[1] & 0x3F);
nextChar += 2;
return true;
}
else if(*nextChar >= 0xe0 && *nextChar <= 0xef)
{
if(*nextChar == 0xe0)
{
if(nextChar + 2 >= endChar || nextChar[1] < 0xa0 || nextChar[1] > 0xbf
|| nextChar[2] < 0x80 || nextChar[2] > 0xbf)
{ return false; }
}
else if(*nextChar == 0xed)
{
if(nextChar + 2 >= endChar || nextChar[1] < 0x80 || nextChar[1] > 0x9f
|| nextChar[2] < 0x80 || nextChar[2] > 0xbf)
{ return false; }
}
else if(*nextChar >= 0xe1 && *nextChar <= 0xef)
{
if(nextChar + 2 >= endChar || nextChar[1] < 0x80 || nextChar[1] > 0xbf
|| nextChar[2] < 0x80 || nextChar[2] > 0xbf)
{ return false; }
}
outCodePoint = (U32(nextChar[0] & 0x0F) << 12) | (U32(nextChar[1] & 0x3F) << 6)
| U32(nextChar[2] & 0x3F);
nextChar += 3;
return true;
}
else if(*nextChar >= 0xf0 && *nextChar <= 0xf4)
{
if(*nextChar == 0xf0)
{
if(nextChar + 3 >= endChar || nextChar[1] < 0x90 || nextChar[1] > 0xbf
|| nextChar[2] < 0x80 || nextChar[2] > 0xbf || nextChar[3] < 0x80
|| nextChar[3] > 0xbf)
{ return false; }
}
else if(*nextChar >= 0xf1 && *nextChar <= 0xf3)
{
if(nextChar + 3 >= endChar || nextChar[1] < 0x80 || nextChar[1] > 0xbf
|| nextChar[2] < 0x80 || nextChar[2] > 0xbf || nextChar[3] < 0x80
|| nextChar[3] > 0xbf)
{ return false; }
}
else if(*nextChar == 0xf4)
{
if(nextChar + 3 >= endChar || nextChar[1] < 0x80 || nextChar[1] > 0x8f
|| nextChar[2] < 0x80 || nextChar[2] > 0xbf || nextChar[3] < 0x80
|| nextChar[3] > 0xbf)
{ return false; }
}
outCodePoint = (U32(nextChar[0] & 0x07) << 18) | (U32(nextChar[1] & 0x3F) << 12)
| (U32(nextChar[2] & 0x3F) << 6) | U32(nextChar[3] & 0x3F);
nextChar += 4;
return true;
}
else
{
return false;
}
}
inline bool decodeUTF16CodePoint(const U16*& nextChar16,
const U16* endChar16,
U32& outCodePoint)
{
// Decode a UTF-16 byte sequence to a Unicode codepoint.
if(nextChar16[0] < 0xd800 || nextChar16[0] >= 0xe000)
{
outCodePoint = nextChar16[0];
++nextChar16;
return true;
}
else if(nextChar16[0] <= 0xdbff)
{
if(nextChar16[1] >= 0xdc00 && nextChar16[1] <= 0xdfff)
{
outCodePoint
= ((nextChar16[0] - 0xd800) << 10) + (nextChar16[1] - 0xdc00) + 0x10000;
nextChar16 += 2;
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}
inline const U8* validateUTF8String(const U8* nextChar, const U8* endChar)
{
U32 codePoint;
while(nextChar != endChar && decodeUTF8CodePoint(nextChar, endChar, codePoint)) {};
return nextChar;
}
template<typename String> void encodeUTF16CodePoint(U32 codePoint, String& outString)
{
if(codePoint < 0x10000) { outString += U16(codePoint); }
else
{
WAVM_ASSERT(codePoint < 0x110000);
outString += U16(((codePoint - 0x10000) >> 10) & 0x3ff) | 0xd800;
outString += U16((codePoint - 0x10000) & 0x3ff) | 0xdc00;
}
}
template<typename String>
const U8* transcodeUTF8ToUTF16(const U8* nextChar, const U8* endChar, String& outString)
{
U32 codePoint;
while(nextChar != endChar && decodeUTF8CodePoint(nextChar, endChar, codePoint))
{ encodeUTF16CodePoint(codePoint, outString); };
return nextChar;
}
template<typename String>
const U16* transcodeUTF16ToUTF8(const U16* nextChar, const U16* endChar, String& outString)
{
U32 codePoint;
while(nextChar != endChar && decodeUTF16CodePoint(nextChar, endChar, codePoint))
{ encodeUTF8CodePoint(codePoint, outString); };
return nextChar;
}
}}
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