template<typename String, typename Iter> inline bool _parse_codepoint(String& out, input<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) {
template<typename Iter> inline int _parse_quadhex(input<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;
}
