public override bool Combine(Operator op, object b, out StoryVar result)
{
result = default(StoryVar);
switch (op)
{
case Operator.Add: {
if (!(b is HarloweDatamap))
{
return(false);
}
var bMap = (HarloweDatamap)b;
var output = new Dictionary <string, StoryVar>(this.Dictionary);
bMap.Dictionary.ToList().ForEach(x => output[x.Key] = x.Value);
result = new HarloweDatamap(output);
break;
}
case Operator.Subtract: {
// Going out on a limb here, adding subtraction support to Harlowe:
// Treat any set as keys to remove from the dictionary
IEnumerable <string> keys;
if (b is HarloweDatamap)
{
keys = ((HarloweDatamap)b).Dictionary.Keys;
}
else if (b is HarloweDataset)
{
keys = ((HarloweDataset)b).Values.Select(v => v.ToString());
}
else if (b is HarloweArray)
{
keys = ((HarloweArray)b).Values.Select(v => v.ToString());
}
else
{
return(false);
}
var keySet = new HashSet <string>(keys);
// A little linq-fu
result = new HarloweDatamap(this.Dictionary
.Where(pair => !keySet.Contains(pair.Key))
.ToDictionary(
pair => pair.Key,
pair => pair.Value,
System.StringComparer.OrdinalIgnoreCase
)
);
break;
}
default:
return(false);
}
return(true);
}
public override IVarType Duplicate()
{
var clone = new HarloweDatamap();
foreach (var pair in this.Dictionary)
{
clone.Dictionary[pair.Key] = pair.Value.Duplicate();
}
return(clone);
}
