public static bool TryPositionToIndex(StoryVar position, int total, out int index)
{
index = -1;
bool fromEnd = false;
if (StoryVar.TryConvertTo <int>(position, out index))
{
if (index <= 0)
{
index = Math.Abs(index);
fromEnd = true;
}
else
{
index -= 1;
}
}
else
{
string str;
if (!StoryVar.TryConvertTo <string>(position, out str))
{
return(false);
}
Match match = rx_Position.Match(str);
if (!match.Success)
{
return(false);
}
fromEnd = match.Groups["last"].Success;
if (match.Groups["index"].Success)
{
index = int.Parse(match.Groups["index"].Value) - 1;
}
else if (fromEnd)
{
index = 0;
}
else
{
return(false);
}
}
if (fromEnd)
{
index = total - 1 - index;
}
return(true);
}
public HarloweDatamap(params StoryVar[] vals) : this()
{
if (vals.Length % 2 != 0)
{
throw new VarTypeException("To create a datamap you must pass an even number of parameters.");
}
for (int i = 0; i < vals.Length; i += 2)
{
string key;
if (!StoryVar.TryConvertTo <string>(vals[i], out key))
{
throw new VarTypeException("To create a datamap, every odd parameter (an entry name) must be string.");
}
Dictionary[key] = vals[i + 1];
}
}
// ................................
// Objects
protected StoryVar obj(params StoryVar[] vals)
{
if (vals.Length % 2 != 0)
{
throw new VarTypeException("To create an object you must pass an even number of parameters.");
}
var dictionary = new Dictionary <string, StoryVar>();
for (int i = 0; i < vals.Length; i += 2)
{
string key;
if (!StoryVar.TryConvertTo <string>(vals[i], out key))
{
throw new VarTypeException("To create an object, every odd parameter (an entry name) must be a string.");
}
dictionary[key] = vals[i + 1];
}
return(new StoryVar(dictionary));
}