|
public static Sub ( |
||
| maxType | ||
| left | object | |
| right | object | |
| return | object | |
public override object Value(IInternalContextAdapter context)
{
object obj = base.GetChild(0).Value(context);
object obj2 = base.GetChild(1).Value(context);
object result;
if (obj == null || obj2 == null)
{
this.rsvc.Error(string.Concat(new object[]
{
(obj == null) ? "Left" : "Right",
" side (",
base.GetChild((obj == null) ? 0 : 1).Literal,
") of subtraction operation has null value. Operation not possible. ",
context.CurrentTemplateName,
" [line ",
base.Line,
", column ",
base.Column,
"]"
}));
result = null;
}
else
{
Type type = MathUtil.ToMaxType(obj.GetType(), obj2.GetType());
if (type == null)
{
result = null;
}
else
{
result = MathUtil.Sub(type, obj, obj2);
}
}
return(result);
}
/// <summary>
/// Computes the value of the subtraction.
/// Currently limited to integers.
/// </summary>
/// <returns>Integer(value) or null</returns>
public override Object Value(IInternalContextAdapter context)
{
// get the two args
Object left = GetChild(0).Value(context);
Object right = GetChild(1).Value(context);
// if either is null, lets log and bail
if (left == null || right == null)
{
runtimeServices.Error(
string.Format(
"{0} side ({1}) of subtraction operation has null value. Operation not possible. {2} [line {3}, column {4}]",
(left == null ? "Left" : "Right"), GetChild((left == null ? 0 : 1)).Literal, context.CurrentTemplateName, Line,
Column));
return(null);
}
Type maxType = MathUtil.ToMaxType(left.GetType(), right.GetType());
if (maxType == null)
{
return(null);
}
return(MathUtil.Sub(maxType, left, right));
// if not an Integer, not much we can do either
// if (!(left is Int32) || !(right is Int32))
// {
// runtimeServices.Error((!(left is Int32) ? "Left" : "Right") + " side of subtraction operation is not a valid type. " + "Currently only integers (1,2,3...) and Integer type is supported. " + context.CurrentTemplateName + " [line " + Line + ", column " + Column + "]");
//
// return null;
// }
//
// return ((Int32) left) - ((Int32) right);
}