// Parse a number - either double, hex integer, decimal interer or octal integer
// Don't need to handle negatives as these are handled by Token.subtract unary operator
public Token ParseNumber()
{
// Base 10 by default
int b=10;
int startPos = p.position;
if (p.current == '0')
{
if (p.CharAtOffset(1) == 'x' || p.CharAtOffset(1) == 'X')
{
p.SkipForward(2);
b = 16;
startPos = p.position;
while (HexDigit(p.current) >= 0)
p.SkipForward(1);
}
else
{
while (p.current == '0')
p.SkipForward(1);
if (p.current != '.' && p.current != 'e' && p.current != 'E')
{
b = 8;
while (OctalDigit(p.current) >= 0)
p.SkipForward(1);
}
}
}
if (b==10)
{
// Leading digits
while (DecimalDigit(p.current) >= 0)
p.SkipForward(1);
// Decimal point
if (p.current == '.' && DecimalDigit(p.CharAtOffset(1)) >= 0)
{
b = 0;
p.SkipForward(2);
while (DecimalDigit(p.current) >= 0)
p.SkipForward(1);
}
// Exponent
if (p.current == 'E' || p.current == 'e')
{
b = 0;
p.SkipForward(1);
if (p.current == '+' || p.current == '-')
p.SkipForward(1);
while (DecimalDigit(p.current) >= 0)
{
p.SkipForward(1);
}
}
}
string str = p.Substring(startPos, p.position - startPos);
if (b == 0)
{
double temp;
if (!double.TryParse(str, out temp))
{
p.position = m_tokenStart;
throw new CompileError(string.Format("Syntax error - incorrectly formatted decimal literal `{0}`", str), this);
}
// Need to store both the parsed value and the original value.
// Original value is used to re-write on render without losing/changing
// the value
DoubleLiteral l = new DoubleLiteral();
l.Value = temp;
l.Original = str;
m_literal = l;
return Token.literal;
}
else
{
try
{
m_literal = Convert.ToInt64(str, b);
return Token.literal;
}
catch (Exception)
{
p.position = m_tokenStart;
throw new CompileError(string.Format("Syntax error - incorrectly formatted integer literal `{0}`", str), this);
}
}
}
// Parse a number - either double, hex integer, decimal interer or octal integer
// Don't need to handle negatives as these are handled by Token.subtract unary operator
public Token ParseNumber()
{
// Base 10 by default
int b = 10;
int startPos = p.position;
if (p.current == '0')
{
if (p.CharAtOffset(1) == 'x' || p.CharAtOffset(1) == 'X')
{
p.SkipForward(2);
b = 16;
startPos = p.position;
while (HexDigit(p.current) >= 0)
{
p.SkipForward(1);
}
}
else
{
while (p.current == '0')
{
p.SkipForward(1);
}
if (p.current != '.' && p.current != 'e' && p.current != 'E')
{
b = 8;
while (OctalDigit(p.current) >= 0)
{
p.SkipForward(1);
}
}
}
}
if (b == 10)
{
// Leading digits
while (DecimalDigit(p.current) >= 0)
{
p.SkipForward(1);
}
// Decimal point
if (p.current == '.' && DecimalDigit(p.CharAtOffset(1)) >= 0)
{
b = 0;
p.SkipForward(2);
while (DecimalDigit(p.current) >= 0)
{
p.SkipForward(1);
}
}
// Exponent
if (p.current == 'E' || p.current == 'e')
{
b = 0;
p.SkipForward(1);
if (p.current == '+' || p.current == '-')
{
p.SkipForward(1);
}
while (DecimalDigit(p.current) >= 0)
{
p.SkipForward(1);
}
}
}
string str = p.Substring(startPos, p.position - startPos);
if (b == 0)
{
double temp;
if (!double.TryParse(str, out temp))
{
p.position = m_tokenStart;
throw new CompileError(string.Format("Syntax error - incorrectly formatted decimal literal `{0}`", str), this);
}
// Need to store both the parsed value and the original value.
// Original value is used to re-write on render without losing/changing
// the value
DoubleLiteral l = new DoubleLiteral();
l.Value = temp;
l.Original = str;
m_literal = l;
return(Token.literal);
}
else
{
try
{
m_literal = Convert.ToInt64(str, b);
return(Token.literal);
}
catch (Exception)
{
p.position = m_tokenStart;
throw new CompileError(string.Format("Syntax error - incorrectly formatted integer literal `{0}`", str), this);
}
}
}
