inline bool _parse_codepoint(String& out, parser<Iter>& in)
{
int uni_ch;
if ((uni_ch = _parse_quadhex(in)) == -1)
{
return false;
}
if (0xd800 <= uni_ch && uni_ch <= 0xdfff)
{
if (0xdc00 <= uni_ch)
{
// a second 16-bit of a surrogate pair appeared
return false;
}
// first 16-bit of surrogate pair, get the next one
if (in.getc() != '\\' || in.getc() != 'u')
{
in.ungetc();
return false;
}
int second = _parse_quadhex(in);
if (!(0xdc00 <= second && second <= 0xdfff))
{
return false;
}
uni_ch = ((uni_ch - 0xd800) << 10) | ((second - 0xdc00) & 0x3ff);
uni_ch += 0x10000;
}
if (uni_ch < 0x80)
{
out.push_back(uni_ch);
}
else
{
if (uni_ch < 0x800)
{
out.push_back(0xc0 | (uni_ch >> 6));
}
else
{
if (uni_ch < 0x10000)
inline int _parse_quadhex(parser<Iter> &in_)
{
int uni_ch = 0,
hex;
for (int i = 0; i < 4; i++)
{
if ((hex = in_.getc()) == -1)
{
return -1;
}
if ('0' <= hex && hex <= '9')
{
hex -= '0';
}
else if ('A' <= hex && hex <= 'F')
{
hex -= 'A' - 0xa;
}
else if ('a' <= hex && hex <= 'f')
{
hex -= 'a' - 0xa;
}
else
{
in_.ungetc();
return -1;
}
uni_ch = uni_ch * 16 + hex;
}
return uni_ch;
}