public static void FormatArgCount(ArgCountRange range, out CountableString result)
{
// (1,_) uncapped => "1 or more arguments"
if (range.MaxArgs == null)
{
result = new CountableString(string.Format(CultureInfo.InvariantCulture, "{0} or more", range.MinArgs), true);
return;
}
// (1,1) => "exactly 1 argument"
if (range.MaxArgs == range.MinArgs)
{
result = new CountableString(string.Format(CultureInfo.InvariantCulture, "exactly {0}", range.MinArgs), range.MinArgs != 1);
return;
}
// (0,1) => "at most 1 argument"
if (range.MinArgs == 0)
{
result = new CountableString(string.Format(CultureInfo.InvariantCulture, "at most {0}", range.MaxArgs), range.MaxArgs != 1);
return;
}
// (1,2) => "1 or 2 arguments"
if (range.MaxArgs == range.MinArgs + 1)
{
result = new CountableString(string.Format(CultureInfo.InvariantCulture, "{0} or {1}", range.MinArgs, range.MaxArgs), true);
return;
}
// (1,3) => "1 to 3 arguments"
result = new CountableString(string.Format(CultureInfo.InvariantCulture, "{0} to {1}", range.MinArgs, range.MaxArgs), true);
}
/// <exception cref="ArgumentException">No ranges provided</exception>
public static void FormatArgCount([NotNull] IEnumerable <ArgCountRange> ranges, out CountableString result)
{
var allCounts = new List <int>();
bool uncapped = false;
foreach (var r in ranges)
{
if (r.MaxArgs == null)
{
uncapped = true;
allCounts.Add(r.MinArgs);
}
else
{
for (int i = r.MinArgs; i <= r.MaxArgs; i++)
{
allCounts.Add(i);
}
}
}
if (allCounts.Count == 0)
{
throw new ArgumentException("No ranges provided", nameof(ranges));
}
allCounts.Sort();
// (1,2), (2,4) => (1,4)
var collapsed = Collapse(
allCounts.Select(c => new { min = c, max = c }),
(a, b) => b.min <= a.max + 1,
(a, b) => new { a.min, b.max })
.ToArray();
if (collapsed.Length == 1)
{
var r = collapsed[0];
var range = new ArgCountRange(r.min, uncapped ? (int?)null : r.max);
FormatArgCount(range, out result);
return;
}
// disjoint ranges
var unrolled = from r in collapsed
from n in Enumerable.Range(r.min, r.max - r.min + 1)
select n.ToString(CultureInfo.InvariantCulture);
if (uncapped)
{
unrolled = unrolled.Concat(Enumerable.Repeat("more", 1));
}
result = new CountableString(EnglishJoin(unrolled, "or"), true);
}