public void Visit(BinaryExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
expression.LeftExpression.Accept(this);
object left = result;
expression.RightExpression.Accept(this);
object right = result;
if (left is int && right is int)
{
switch (expression.Type)
{
case BinaryExpressionType.Plus:
result = Convert.ToInt32(left) + Convert.ToInt32(right);
break;
case BinaryExpressionType.Minus:
result = Convert.ToInt32(left) - Convert.ToInt32(right);
break;
case BinaryExpressionType.Multiply:
result = Convert.ToInt32(left) * Convert.ToInt32(right);
break;
case BinaryExpressionType.Div:
result = Convert.ToInt32(left) / Convert.ToInt32(right);
break;
case BinaryExpressionType.Mod:
result = Convert.ToInt32(left) % Convert.ToInt32(right);
break;
case BinaryExpressionType.ShiftLeft:
result = Convert.ToInt32(left) << Convert.ToInt32(right);
break;
case BinaryExpressionType.ShiftRight:
result = Convert.ToInt32(left) >> Convert.ToInt32(right);
break;
case BinaryExpressionType.GreaterOrEqual:
result = (Convert.ToInt32(left) >= Convert.ToInt32(right)) ? 1 : 0;
break;
case BinaryExpressionType.LesserOrEqual:
result = (Convert.ToInt32(left) <= Convert.ToInt32(right)) ? 1 : 0;
break;
case BinaryExpressionType.Greater:
result = (Convert.ToInt32(left) > Convert.ToInt32(right)) ? 1 : 0;
break;
case BinaryExpressionType.Lesser:
result = (Convert.ToInt32(left) < Convert.ToInt32(right)) ? 1 : 0;
break;
case BinaryExpressionType.Equal:
result = (Convert.ToInt32(left) == Convert.ToInt32(right)) ? 1 : 0;
break;
case BinaryExpressionType.NotEqual:
result = (Convert.ToInt32(left) != Convert.ToInt32(right)) ? 1 : 0;
break;
case BinaryExpressionType.BitXor:
result = Convert.ToInt32(left) ^ Convert.ToInt32(right);
break;
case BinaryExpressionType.BitAnd:
result = Convert.ToInt32(left) & Convert.ToInt32(right);
break;
case BinaryExpressionType.BitOr:
result = Convert.ToInt32(left) | Convert.ToInt32(right);
break;
case BinaryExpressionType.And:
bool andResult = Convert.ToBoolean(left) && Convert.ToBoolean(right);
result = Convert.ToInt32(andResult);
break;
case BinaryExpressionType.Or:
bool orResult = Convert.ToBoolean(left) || Convert.ToBoolean(right);
result = Convert.ToInt32(orResult);
break;
default:
throw new ExpressionEvaluatorException(
String.Format("binary operation '{0}' is not supported.", expression.Type));
}
}
else
{
result = String.Format("{0} {1} {2}",
left,
GetBinaryOperatorString(expression.Type),
right);
}
}
public void Visit(BinaryExpression expression)
{
throw new NotImplementedException();
}
