public static Object.Object InfixExpression(Object.IntegerObject left, string op, Object.IntegerObject right)
{
if (op == "+")
{
return(new Object.IntegerObject {
Value = left.Value + right.Value
});
}
if (op == "-")
{
return(new Object.IntegerObject {
Value = left.Value - right.Value
});
}
if (op == "*")
{
return(new Object.IntegerObject {
Value = left.Value * right.Value
});
}
if (op == "/")
{
return(new Object.IntegerObject {
Value = left.Value / right.Value
});
}
if (op == "^")
{
return(new Object.IntegerObject {
Value = (long)Math.Pow((double)left.Value, (double)right.Value)
});
}
throw new Exception($"Unsupported arithmetic operator {op}");
}
public static Object.Object EvalPrefixExpression(PrefixExpression expression)
{
Object.Object right = Eval(expression.Right);
Object.IntegerObject rightInteger = right as Object.IntegerObject;
if(rightInteger == null)
{
throw new Exception("Prefix expression right is not Object.IntegerObject");
}
return new Object.IntegerObject { Value = -1 * rightInteger.Value };
}
public static Object.Object EvalInfixExpression(AST.InfixExpression expression)
{
Object.Object left = Eval(expression.Left);
Object.IntegerObject leftInteger = left as Object.IntegerObject;
if (leftInteger == null)
{
throw new Exception("Infix expression left branch is not Object.IntegerObject");
}
Object.Object right = Eval(expression.Right);
Object.IntegerObject rightInteger = right as Object.IntegerObject;
if (rightInteger == null)
{
throw new Exception("Infix expression right branch is not Object.IntegerObject");
}
return(InfixExpression(leftInteger, expression.Operator, rightInteger));
}