// A hot mess but gets the return value based on types given left and right
public dynamic visit(BinOp binOp)
{
int left = 0;
int right = 0;
Type leftType = binOp.getLeft().GetType();
Type rightType = binOp.getRight().GetType();
if (leftType == typeof(Num))
{
left = this.visit((Num)binOp.getLeft());
}
else if (leftType == typeof(BinOp))
{
left = this.visit((BinOp)binOp.getLeft());
}
else if (leftType == typeof(Var))
{
left = this.visit((Var)binOp.getLeft());
}
if (rightType == typeof(Num))
{
right = this.visit((Num)binOp.getRight());
}
else if (rightType == typeof(BinOp))
{
right = this.visit((BinOp)binOp.getRight());
}
else if (rightType == typeof(Var))
{
right = this.visit((Var)binOp.getRight());
}
if (leftType == typeof(Str))
{
if (rightType == typeof(Str))
{
if (binOp.getOp().GetTokenValueType() == TokenValues.PLUS)
{
return(this.visit((Str)binOp.getLeft()) + this.visit((Str)binOp.getRight()));
}
}
else
{
throw new InterpreterException(String.Format("Incompatible types for operation {0}: {1} {2}", binOp.getOp().GetTokenValueType(), leftType, rightType));
}
}
switch (binOp.getOp().GetTokenValueType())
{
case TokenValues.PLUS:
return(left + right);
case TokenValues.MINUS:
return(left - right);
case TokenValues.MULTIPLY:
return(left * right);
case TokenValues.DIVISION:
return(left / right);
case TokenValues.EQUAL:
return(left == right);
case TokenValues.LESSTHAN:
return(left < right);
default:
throw(new InterpreterException("Invalid syntax"));
}
}