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);
}
public FunctionDeclaration(Document parent, ref string Input)
: base(parent)
{
Pattern regExPattern =
"^\\s*" +
new Group("def",
new Group("type", Provider.type) +
"\\s+" +
new Group("identifier", Provider.identifier) +
"\\s*\\(" +
new Group("params",
"\\s*" +
Provider.type + "\\s*" + Provider.identifier +
"\\s*(,\\s*" +
Provider.type + "\\s*" + Provider.identifier +
")*") +
"?" +
"\\)\\s*") +
new Group("terminus", "[;{]");
System.Text.RegularExpressions.Regex regEx = new System.Text.RegularExpressions.Regex(regExPattern);
System.Text.RegularExpressions.Match match = regEx.Match(Input);
if (!match.Success)
{
throw new ParseException();
}
//if (match.Index != 0)
// throw new ParseException();
Input = Input.Remove(0, match.Index + match.Length); // Also removes all starting spaces etc...
Type = ITypeSpecifier.Parse(this, match.Groups["type"].Value);
if (Type == null)
{
throw new SyntaxException("Error parsing variable: Expected type, got \"" + match.Groups["type"].Value + "\".");
}
Identifier = match.Groups["identifier"].Value;
if ((Identifier == null) || (Identifier == ""))
{
throw new SyntaxException("Error parsing variable: Expected identifier, got \"" + match.Groups["identifier"].Value + "\".");
}
string[] paramStrings = match.Groups["params"].Value.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
List <VariableDeclaration> param = new List <VariableDeclaration>();
for (int i = 0; i < paramStrings.Length; i++)
{
paramStrings[i] = paramStrings[i].Trim(new char[] { ' ', '\t', '\n', '\r' });
try
{
VariableDeclaration decl = new VariableDeclaration(this, ref paramStrings[i], false);
param.Add(decl);
}
catch (ParseException)
{
}
}
Parameters = param.ToArray();
if (match.Groups["terminus"].Value == "{") // Well, there's a body...
{
//TODO: Parse body of function...
//Body = new ISyntaxNode[0];
List <ISyntaxNode> bodyNodes = new List <ISyntaxNode>();
System.Text.RegularExpressions.Regex endMatch = new System.Text.RegularExpressions.Regex("^\\s*}");
while (!endMatch.IsMatch(Input))
{
FunctionCall fcall = TryParse <FunctionCall>(this, ref Input);
if (fcall != null)
{
bodyNodes.Add(fcall);
// Search for following semikolon and remove it...
System.Text.RegularExpressions.Regex semikolon = new System.Text.RegularExpressions.Regex("^\\s*;");
System.Text.RegularExpressions.Match semikolonMatch = semikolon.Match(Input);
if (!semikolonMatch.Success)
{
throw new SyntaxException("Syntax error: Missing semikolon after function call.");
}
Input = Input.Remove(0, semikolonMatch.Length);
continue;
}
throw new SyntaxException("Syntax error: Invalid token \"" + Input + "\"");
}
Body = bodyNodes.ToArray();
// Finally remove remaining (closing) }
int index = Input.IndexOf('}');
Input = Input.Remove(0, index + 1);
}
else if (match.Groups["terminus"].Value == ";") // No Body, only header declaration
{
Body = null;
}
}
