protected override object Evaluate(object context, EvaluationContext evalContext)
{
object left = Left.EvaluateInternal(context, evalContext);
object right = Right.EvaluateInternal(context, evalContext);
if (NumberUtils.IsNumber(left) && NumberUtils.IsNumber(right))
{
return(NumberUtils.Add(left, right));
}
else if (left is DateTime && (right is TimeSpan || right is string || NumberUtils.IsNumber(right)))
{
if (NumberUtils.IsNumber(right))
{
right = TimeSpan.FromDays(System.Convert.ToDouble(right));
}
else if (right is string)
{
right = TimeSpan.Parse((string)right);
}
return((DateTime)left + (TimeSpan)right);
}
else if (left is String || right is String)
{
return(left.ToString() + right.ToString());
}
else
{
throw new ArgumentException("Cannot add instances of '"
+ left.GetType().FullName
+ "' and '"
+ right.GetType().FullName
+ "'.");
}
}
protected override object Evaluate(object context, BaseNode.EvaluationContext evalContext)
{
object number = base.Left.EvaluateInternal(context, evalContext);
object obj3 = base.Right.EvaluateInternal(context, evalContext);
if (NumberUtils.IsNumber(number) && NumberUtils.IsNumber(obj3))
{
return(NumberUtils.Add(number, obj3));
}
if ((number is DateTime) && (((obj3 is TimeSpan) || (obj3 is string)) || NumberUtils.IsNumber(obj3)))
{
if (NumberUtils.IsNumber(obj3))
{
obj3 = TimeSpan.FromDays(Convert.ToDouble(obj3));
}
else if (obj3 is string)
{
obj3 = TimeSpan.Parse((string)obj3);
}
return(((DateTime)number) + ((TimeSpan)obj3));
}
if (!(number is string) && !(obj3 is string))
{
throw new ArgumentException("Cannot add instances of '" + number.GetType().FullName + "' and '" + obj3.GetType().FullName + "'.");
}
return(number.ToString() + obj3.ToString());
}
/// <summary>
/// Returns a value for the arithmetic addition operator node.
/// </summary>
/// <param name="context">Context to evaluate expressions against.</param>
/// <param name="evalContext">Current expression evaluation context.</param>
/// <returns>Node's value.</returns>
protected override object Get(object context, EvaluationContext evalContext)
{
var lhs = GetLeftValue(context, evalContext);
var rhs = GetRightValue(context, evalContext);
if (NumberUtils.IsNumber(lhs) && NumberUtils.IsNumber(rhs))
{
return(NumberUtils.Add(lhs, rhs));
}
if (lhs is DateTime && (rhs is TimeSpan || rhs is string || NumberUtils.IsNumber(rhs)))
{
if (NumberUtils.IsNumber(rhs))
{
rhs = TimeSpan.FromDays(Convert.ToDouble(rhs));
}
else if (rhs is string)
{
rhs = TimeSpan.Parse((string)rhs);
}
return((DateTime)lhs + (TimeSpan)rhs);
}
if (lhs is String || rhs is String)
{
return(string.Concat(lhs, rhs));
}
if ((lhs is IList || lhs is ISet) && (rhs is IList || rhs is ISet))
{
ISet leftset = new HybridSet(lhs as ICollection);
ISet rightset = new HybridSet(rhs as ICollection);
return(leftset.Union(rightset));
}
if (lhs is IDictionary && rhs is IDictionary)
{
ISet leftset = new HybridSet(((IDictionary)lhs).Keys);
ISet rightset = new HybridSet(((IDictionary)rhs).Keys);
var unionset = leftset.Union(rightset);
IDictionary result = new Hashtable(unionset.Count);
foreach (var key in unionset)
{
if (leftset.Contains(key))
{
result.Add(key, ((IDictionary)lhs)[key]);
}
else
{
result.Add(key, ((IDictionary)rhs)[key]);
}
}
return(result);
}
throw new ArgumentException("Cannot add instances of '"
+ lhs.GetType().FullName
+ "' and '"
+ rhs.GetType().FullName
+ "'.");
}
public void Add()
{
Assert.AreEqual(5, NumberUtils.Add(2, 3));
try
{
NumberUtils.Add(2, "3");
Assert.Fail();
}
catch(ArgumentException)
{}
}
/// <summary>
/// Returns the sum of the numeric values in the source collection.
/// </summary>
/// <param name="source">
/// The source collection to process.
/// </param>
/// <param name="args">
/// Ignored.
/// </param>
/// <returns>
/// The sum of the numeric values in the source collection.
/// </returns>
public object Process(ICollection source, object[] args)
{
object total = 0d;
foreach (object item in source)
{
if (item != null)
{
if (NumberUtils.IsNumber(item))
{
total = NumberUtils.Add(total, item);
}
else
{
throw new ArgumentException("Sum can only be calculated for a collection of numeric values.");
}
}
}
return(total);
}
/// <summary>
/// Returns the average of the numeric values in the source collection.
/// </summary>
/// <param name="source">
/// The source collection to process.
/// </param>
/// <param name="args">
/// Ignored.
/// </param>
/// <returns>
/// The average of the numeric values in the source collection.
/// </returns>
public object Execute(ICollection source, object[] args)
{
var n = 0;
object total = 0d;
foreach (var item in source)
{
if (item != null)
{
if (NumberUtils.IsNumber(item))
{
total = NumberUtils.Add(total, item);
n++;
}
else
{
throw new ArgumentException("Average can only be calculated for a collection of numeric values.");
}
}
}
return(NumberUtils.Divide(total, n));
}
