public static Command Then(this Command first, Command next)
{
return(Command.Create(first.Action.CombineLatest(next.Action, (o1, o2) =>
{
return Optional.Combine(o1, o2, (a1, a2) => a1 + a2);
})));
}
static Parsed <Thickness <Points> > TryParseThickness(string str)
{
var parts = str.Split(",");
switch (parts.Length)
{
case 1:
return(parts[0].TryParsePoints()
.Select(all => new Thickness <Points>(all)));
case 2:
return(Parsed.Create(
stringValue: str,
value: Optional.Combine(
parts[0].TryParsePoints().Value,
parts[1].TryParsePoints().Value,
(h, v) => new Thickness <Points>(h, v))));
case 4:
return(Parsed.Create(
stringValue: str,
value: Optional.Combine(
parts[0].TryParsePoints().Value,
parts[1].TryParsePoints().Value,
parts[2].TryParsePoints().Value,
parts[3].TryParsePoints().Value,
(l, t, r, b) => new Thickness <Points>(l, t, r, b))));
default:
return(Parsed.Failure <Thickness <Points> >(str));
}
}