bool parser::parse_number(context& ctx, number_type& value, IteratorType& ch, IteratorType end)
{
ctx.clear();
// Check if the number is negative
if (ch != end)
{
if (*ch == '-')
{
ctx.push_char(*ch);
++ch;
}
}
if (ch == end)
{
return false;
}
switch (*ch)
{
case '0':
ctx.push_char(*ch);
++ch;
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
ctx.push_char(*ch);
++ch;
while ((ch != end) && std::isdigit(*ch))
{
ctx.push_char(*ch);
++ch;
}
break;
}
// Check for a period
if (ch != end)
{
if (*ch == '.')
{
ctx.push_char(*ch);
++ch;
while ((ch != end) && std::isdigit(*ch))
{
ctx.push_char(*ch);
++ch;
}
}
}
// Check for an exponent
if (ch != end)
{
if ((*ch == 'e') || (*ch == 'E'))
{
ctx.push_char(*ch);
++ch;
if (ch == end)
{
return false;
}
switch (*ch)
{
case '-':
ctx.push_char(*ch);
++ch;
break;
case '+':
ctx.push_char(*ch);
++ch;
break;
}
if (ch == end)
{
return false;
}
while ((ch != end) && std::isdigit(*ch))
{
ctx.push_char(*ch);
++ch;
}
}
}
if (!ctx.get_number(value))
{
return false;
}
return true;
}
bool parser::parse_string(context& ctx, string_type& value, IteratorType& ch, IteratorType end)
{
ctx.clear();
if (!check_char(ctx, '"', ch, end))
{
return false;
}
while (ch != end)
{
if (std::iscntrl(*ch))
{
return false;
}
switch (*ch)
{
case '"':
{
// The string ends.
++ch;
value = ctx.str();
return true;
}
case '\\':
{
// An escape character was provided.
++ch;
if (ch == end)
{
return false;
}
switch (*ch)
{
case '"':
ctx.push_char('"');
++ch;
break;
case '\\':
ctx.push_char('\\');
++ch;
break;
case '/':
ctx.push_char('/');
++ch;
break;
case 'b':
ctx.push_char('\b');
++ch;
break;
case 'n':
ctx.push_char('\n');
++ch;
break;
case 'f':
ctx.push_char('\f');
++ch;
break;
case 'r':
ctx.push_char('\r');
++ch;
break;
case 't':
ctx.push_char('\t');
++ch;
break;
case 'u':
{
++ch;
uint16_t codepoint = 0x0000;
for (size_t i = 0; i < 4; ++i)
{
if (ch == end)
{
return false;
}
if (!std::isxdigit(*ch))
{
return false;
}
codepoint *= 16;
codepoint += xdigit_to_int(*ch);
++ch;
}
ctx.push_codepoint(codepoint);
break;
}
default:
return false;
}
break;
}
default:
{
ctx.push_char(*ch);
++ch;
}
}
}
return false;
}