private string VisitBinary(BinaryExpression expression)
{
ExceptionUtils.MustBeTrue(expression != null);
string operatorText;
switch (expression.NodeType)
{
case ExpressionType.Multiply:
operatorText = "*";
break;
case ExpressionType.Add:
operatorText = "+";
break;
case ExpressionType.Subtract:
operatorText = "-";
break;
default:
throw new NotImplementedException(expression.GetType().FullName);
}
var wrapWithParens = this.operatorStack.Count > 0 && this.operatorStack.Peek() != expression.NodeType;
string format = wrapWithParens ? "({0} {1} {2})" : "{0} {1} {2}";
try
{
this.operatorStack.Push(expression.NodeType);
return string.Format(format, Visit(expression.Left), operatorText, Visit(expression.Right));
}
finally
{
this.operatorStack.Pop();
}
}
