internal static string TakeIf(this InputReader input, params char[] anyOf)
{
input.SkipWhiteSpace();
if (input.NextIs(anyOf))
{
return(input.Next().ToString());
}
return("");
}
internal static string TakeWhile(this InputReader input, Func <char, bool> predicate)
{
input.SkipWhiteSpace();
string token = "";
while (input.HasNext() && predicate(input.PeekNext()))
{
token += input.Next();
}
return(token);
}
internal static bool NextIs(this InputReader input, params char[] anyOf)
{
input.SkipWhiteSpace();
return(input.HasNext() && anyOf.Contains(input.PeekNext()));
}