public override Node ExitReal(Token node)
{
LiteralElement element = default(LiteralElement);
string image = node.Image;
if (image.EndsWith("f", StringComparison.OrdinalIgnoreCase) == true)
{
image = image.Remove(image.Length - 1);
element = SingleLiteralElement.Parse(image, MyServices);
}
else
{
element = DoubleLiteralElement.Parse(image, MyServices);
}
node.AddValue(element);
return(node);
}
// Attempt to find the first type of integer that a number can fit into
public static LiteralElement Create(string image, bool isHex, bool negated, IServiceProvider services)
{
StringComparison comparison = StringComparison.OrdinalIgnoreCase;
ExpressionOptions options = services.GetService(typeof(ExpressionOptions)) as ExpressionOptions;
// Convert to a double if option is set
if (options.IntegersAsDoubles == true)
{
return(DoubleLiteralElement.Parse(image, services));
}
bool hasUSuffix = image.EndsWith("u", comparison) & !image.EndsWith("lu", comparison);
bool hasLSuffix = image.EndsWith("l", comparison) & !image.EndsWith("ul", comparison);
bool hasULSuffix = image.EndsWith("ul", comparison) | image.EndsWith("lu", comparison);
bool hasSuffix = hasUSuffix | hasLSuffix | hasULSuffix;
LiteralElement constant = default(LiteralElement);
NumberStyles numStyles = NumberStyles.Integer;
if (isHex == true)
{
numStyles = NumberStyles.AllowHexSpecifier;
image = image.Remove(0, 2);
}
if (hasSuffix == false)
{
// If the literal has no suffix, it has the first of these types in which its value can be represented: int, uint, long, ulong.
constant = Int32LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
constant = UInt32LiteralElement.TryCreate(image, numStyles);
if ((constant != null))
{
return(constant);
}
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
return(new UInt64LiteralElement(image, numStyles));
}
else if (hasUSuffix == true)
{
image = image.Remove(image.Length - 1);
// If the literal is suffixed by U or u, it has the first of these types in which its value can be represented: uint, ulong.
constant = UInt32LiteralElement.TryCreate(image, numStyles);
if ((constant != null))
{
return(constant);
}
else
{
return(new UInt64LiteralElement(image, numStyles));
}
}
else if (hasLSuffix == true)
{
// If the literal is suffixed by L or l, it has the first of these types in which its value can be represented: long, ulong.
image = image.Remove(image.Length - 1);
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
else
{
return(new UInt64LiteralElement(image, numStyles));
}
}
else
{
// If the literal is suffixed by UL, Ul, uL, ul, LU, Lu, lU, or lu, it is of type ulong.
Debug.Assert(hasULSuffix == true, "expecting ul suffix");
image = image.Remove(image.Length - 2);
return(new UInt64LiteralElement(image, numStyles));
}
}
