private Node ParseClassDeclaration()
{
Token t = lexer.GetNext();
List <string> modifiers = new List <string>();
if (t.value == "public" || t.value == "private" || t.value == "protected")
{
modifiers.Add(t.value);
t = lexer.GetNext();
}
if (t.value == "abstract" || t.value == "static")
{
modifiers.Add(t.value);
t = lexer.GetNext();
}
if (t.value == "class")
{
var f = ParseFactor();
if (f is NodeIdentifier)
{
NodeIdentifier identifier = (NodeIdentifier)f;
identifier.type = "class";
return(new NodeClassDeclaration()
{
modifiers = modifiers, identifier = identifier, body = ParseClassBody()
});
}
}
if (modifiers.Count == 0)
{
lexer.PutBack(t);
}
return(new NodeError());
}
private Node ParseParameter()
{
Token t = lexer.GetNext();
if (t.type == TokenType.VARTYPE)
{
var f = ParseFactor();
if (f is NodeIdentifier)
{
NodeIdentifier identifier = (NodeIdentifier)f;
identifier.type = t.value;
try
{
varDictionary.Add(identifier.name, identifier);
}
catch
{
Console.WriteLine("ERROR: Identifier " + identifier.name + " is already declarated");
return(new NodeParameter()
{
identifier = identifier
});
}
return(new NodeParameter()
{
identifier = identifier
});
}
return(new NodeError());
}
lexer.PutBack(t);
return(null);
}
private ResType DefineResType(Node operand)
{
if (operand is NodeBinaryOp)
{
NodeBinaryOp o = (NodeBinaryOp)operand;
return(o.resType);
}
if (operand is NodeUnaryOp)
{
NodeUnaryOp o = (NodeUnaryOp)operand;
return(o.resType);
}
if (operand is NodeBoolLiteral)
{
return(ResType.BOOL);
}
if (operand is NodeIntLiteral || operand is NodeFloatLiteral || operand is NodeDoubleLiteral)
{
return(ResType.NUM);
}
if (operand is NodeStringLiteral)
{
return(ResType.STRING);
}
if (operand is NodeCharLiteral)
{
return(ResType.CHAR);
}
if (operand is NodeIdentifier)
{
NodeIdentifier ni = (NodeIdentifier)operand;
if (ni.type == "int" || ni.type == "float" || ni.type == "double")
{
return(ResType.NUM);
}
if (ni.type == "bool")
{
return(ResType.BOOL);
}
if (ni.type == "string")
{
return(ResType.STRING);
}
if (ni.type == "char")
{
return(ResType.CHAR);
}
return(ResType.IDENTIFIER);
}
return(ResType.ERROR);
}
