public static IRightValue Parse(ISyntaxNode parent, ref string Input)
{
string temp = Input;
System.Text.RegularExpressions.Regex endRegEx = new System.Text.RegularExpressions.Regex("^\\s*$");
System.Text.RegularExpressions.Regex bracketsRegEx = new System.Text.RegularExpressions.Regex("^\\s*\\)\\s*");
System.Text.RegularExpressions.Regex commaRegEx = new System.Text.RegularExpressions.Regex("^\\s*,\\s*");
IRightValue highestNode = null;
while ((!endRegEx.IsMatch(Input)) && (!bracketsRegEx.IsMatch(Input)) && (!commaRegEx.IsMatch(Input)))
{
IntegerConstant iconst = TryParse <IntegerConstant>(parent, ref Input);
if (iconst != null)
{
if (highestNode != null) // Function calls can only be the first one.
{
throw new SyntaxException("Syntax error: Invalid rvalue before integer constant.");
}
highestNode = iconst;
continue;
}
FloatingConstant fconst = TryParse <FloatingConstant>(parent, ref Input);
if (fconst != null)
{
if (highestNode != null) // Function calls can only be the first one.
{
throw new SyntaxException("Syntax error: Invalid rvalue before floating constant.");
}
highestNode = fconst;
continue;
}
FunctionCall fcall = TryParse <FunctionCall>(parent, ref Input);
if (fcall != null)
{
if (highestNode != null) // Function calls can only be the first one.
{
throw new SyntaxException("Syntax error: Invalid rvalue before function call.");
}
highestNode = fcall;
continue;
}
//string tmp = Input;
IBinaryOperator binop = IBinaryOperator.Parse(parent, ref Input, highestNode);
if (binop != null)
{
// Input = tmp;
if (highestNode == null) // Function calls can only be the first one.
{
throw new SyntaxException("Syntax error: Missing first operand for binary operator.");
}
highestNode = binop;
continue;
}
IUnaryOperator unop = IUnaryOperator.Parse(parent, ref Input, highestNode);
if (unop != null)
{
if ((unop.Position == OperatorPosition.Postfix) && (highestNode == null)) // Function calls can only be the first one.
{
throw new SyntaxException("Syntax error: Missing first operand for unary operator.");
}
highestNode = unop;
continue;
}
Brackets backets = TryParse <Brackets>(parent, ref Input);
if (backets != null)
{
if (highestNode != null) // Function calls can only be the first one.
{
throw new SyntaxException("Syntax error: Invalid rvalue before brackets.");
}
highestNode = backets;
continue;
}
// InfixOperator iopp = TryParse<InfixOperator>(ref Input, delegate(ref string i) { return new InfixOperator(parent, ref i, highestNode); });
// if (iopp != null)
// highestNode = fcall;
// Well, if nothing got parsed, then it's a invalid expression
throw new SyntaxException("Syntax error: Invalid token \"" + Input + "\"");
}
if ((highestNode is IOperator) &&
((highestNode as IOperator).SecondaryOperand is IOperator) &&
(highestNode.Priority < (highestNode as IOperator).SecondaryOperand.Priority))
{
IOperator higher = (highestNode as IOperator);
IOperator lower = (IOperator)higher.SecondaryOperand;
higher.SecondaryOperand = lower.PrimaryOperand;
lower.PrimaryOperand = higher;
higher = lower;
highestNode = higher;
}
return(highestNode);
}
