/* Parse one to six hex digits, optionally followed by a single
whitespace character. (In a string, a backslash followed by this is
interpreted as a hex escape.)
*/
static int parse_escaped_hex(mincss_context *context, int32_t *retval)
{
/* The backslash has already been accepted. */
int count = 0;
int32_t res = 0;
int32_t ch = -1;
while (1) {
ch = next_char(context);
if (ch == -1) {
if (count)
*retval = res;
return count;
}
count++;
if (count > 6)
break;
if (!IS_HEX_DIGIT(ch))
break;
if (ch >= '0' && ch <= '9')
ch -= '0';
else if (ch >= 'A' && ch <= 'F')
ch -= ('A'-10);
else if (ch >= 'a' && ch <= 'f')
ch -= ('a'-10);
else
ch = 0;
res = (res << 4) + ch;
}
if (ch == '\r' && count >= 2) {
/* swallow the \r, plus an \n if one follows */
ch = next_char(context);
if (ch == -1) {
*retval = res;
return count;
}
count++;
if (ch == '\n') {
*retval = res;
return count;
}
putback_char(context, 1);
count -= 1;
*retval = res;
return count;
}
if (IS_WHITESPACE(ch) && count >= 2) {
/* swallow it */
*retval = res;
return count;
}
putback_char(context, 1);
count -= 1;
if (count)
*retval = res;
return count;
}
/*
* Enumerate new number
*/
void
_lex::_enum_number(void)
{
trace(
LEX_TRACE_ENABLE,
TRACE_ENTRY,
"lex::enum_number"
);
_typ = LEX_TOKEN_NUMBER;
_txt += get_char();
if(next_char()) {
if(get_char() == HEX_DEC_L
|| get_char() == HET_DEC_U) {
_typ = LEX_TOKEN_HEX_NUMBER;
_txt.clear();
if(!next_char())
throw std::runtime_error(
_format_exception(
LEX_EXC_INVALID_HEX_NUM,
get_line()
));
while(IS_HEX_DIGIT(get_char())) {
_txt += get_char();
if(has_next_char()) {
if(!next_char())
throw std::runtime_error(
_format_exception(
LEX_EXC_UNEXP_EOF,
get_line()
));
} else
break;
}
} else if(isdigit(get_char())) {
_txt += get_char();
if(!next_char())
throw std::runtime_error(
_format_exception(
LEX_EXC_UNEXP_EOF,
get_line()
));
while(isdigit(get_char())) {
_txt += get_char();
if(has_next_char()) {
if(!next_char())
throw std::runtime_error(
_format_exception(
LEX_EXC_UNEXP_EOF,
get_line()
));
} else
break;
}
}
}
trace(
LEX_TRACE_ENABLE,
TRACE_EXIT,
"lex::enum_number"
);
}
