private Node parseCall()
{
Node left = parsePrimary();
while (true)
{
if (match(TType.OPEN_PAREN))
{
if (!(left is Variable))
{
throw new Exception($"Invalid call target '{left.GetType().Name}', can only be a function.");
}
List <Node> args = new List <Node>();
if (!check(TType.CLOSE_PAREN))
{
do
{
args.Add(parseExpression());
} while (match(TType.COMMA));
}
consume(TType.CLOSE_PAREN, "Expected ')' after function call parameters");
left = new CallFunc(((Variable)left).Name.lexeme, args.ToArray());
}
else if (match(TType.OPEN_SQR))
{
Node idx = parsePrimary();
if (!(left is Variable))
{
throw new Exception($"Expected variable name before indexing, got {idx.GetType().Name}");
}
consume(TType.CLOSE_SQR, "Expected ']' after index");
left = new IndexArray(left, idx);
}
else
{
break;
}
}
return(left);
}
private Type GetResultType(Node n)
{
if (n is IntLiteral)
{
return(ToType("int"));
}
else if (n is FloatLiteral)
{
return(ToType("float"));
}
else if (n is StringLiteral)
{
return(ToType("string"));
}
else if (n is BinaryOperation binop)
{
Type left = GetResultType(binop.left);
Type right = GetResultType(binop.right);
if (IsNumericType(left) && !IsNumericType(right))
{
throw new Exception($"Cannot perform '{binop.op.lexeme}' operation on '{left.Name}' and '{right.Name}'");
}
return(left);
}
else if (n is CastValue cast)
{
return(ToType(cast.type));
}
else if (n is ValToString)
{
return(ToType("string"));
}
else if (n is Variable var)
{
if (localSymbols.ContainsKey(var.Name.lexeme))
{
return(localSymbols[var.Name.lexeme].LocalType);
}
else if (current_method_args.Contains(var.Name.lexeme))
{
return(current_method_types[Array.IndexOf(current_method_args, var.Name.lexeme)]);
}
else if (globalSymbols.ContainsKey(var.Name.lexeme))
{
return(globalSymbols[var.Name.lexeme].FieldType);
}
else
{
throw new Exception($"Tried getting type of a undeclared variable '{var.Name.lexeme}'");
}
}
else if (n is CallFunc cf)
{
if (externMethods.ContainsKey(cf.funcName))
{
return(externMethods[cf.funcName].ReturnType);
}
else if (globalSymbols.ContainsKey(cf.funcName) && !(cTypeBuilder.GetMethod(cf.funcName) is null))
{
MethodInfo method = cTypeBuilder.GetMethod(cf.funcName);
return(method.ReturnType);
}
else
{
throw new Exception($"Unknown function '{cf.funcName}'");
}
}
else if (n is IndexArray idxarr)
{
return(GetResultType(idxarr.value).GetElementType());
}
else if (n is CreateArray crarr)
{
return(ToType(crarr.arrayType));
}
else if (n is NewInstance newinst)
{
return(newinst.instanceType.type);
}
throw new Exception($"Cannot get result type of {n.GetType().FullName}");
}