/// <summary>
/// Returns a collection of elements at what would be the i'th element for i \in [startIdx,lastIdx]. startIdx and lastIdx are 0-based.
/// </summary>
private RangeCollection ElementsAt(long startIndex, long lastIndex)
{
if (lastIndex < startIndex || startIndex < 0 || lastIndex >= Count())
{
throw new ArgumentOutOfRangeException(string.Format("{0}-{1} must be a non-empty range that falls between 0 and {2}", startIndex, lastIndex, Count() - 1));
}
RangeCollection result = new RangeCollection();
long countSoFar = 0;
foreach (KeyValuePair <long, long> range in Ranges)
{
long rangeLength = range.Value - range.Key + 1;
if (startIndex - countSoFar < rangeLength)
{
long start = range.Key + startIndex - countSoFar;
long lastIfContinuousRange = range.Key + lastIndex - countSoFar;
long last = Math.Min(range.Value, lastIfContinuousRange); // if startIdx-lastIdx falls completely in range, then take 2nd entry.
result.AddRange(start, last);
if (lastIfContinuousRange <= range.Value) // if this range covers the remaining indeces, we're done.
{
return(result);
}
else
{
startIndex = countSoFar + rangeLength;
}
}
countSoFar += rangeLength;
}
throw new NotImplementedException("If we get here, then there's a bug in the implementation.");
}
/// <summary>
/// Returns the competeCollection - thisCollection
/// </summary>
/// <returns></returns>
public RangeCollection Complement(long fullRangeBegin, long fullRangeEnd)
{
RangeCollection result = new RangeCollection();
long rangeLeftToCoverBegin = fullRangeBegin;
foreach (KeyValuePair <long, long> range in Ranges)
{
long start = range.Key;
long last = range.Value;
if (start > rangeLeftToCoverBegin)
{
result.AddRange(rangeLeftToCoverBegin, Math.Min(start - 1, fullRangeEnd));
}
rangeLeftToCoverBegin = Math.Max(rangeLeftToCoverBegin, last + 1);
if (rangeLeftToCoverBegin > fullRangeEnd)
{
break;
}
}
if (rangeLeftToCoverBegin <= fullRangeEnd)
{
result.AddRange(rangeLeftToCoverBegin, fullRangeEnd);
}
return(result);
}
/// <summary>
/// Parses strings of the form -10--5,-2-10,12-12 . Spaces are allowed, no other characters are.
/// If mergeOverlappingRanges, then, for example, 2-3,4-5 is represented
/// as 2-5. Otherwise, they're maintained as separate ranges. The only difference is in the behavior of the ToString() call.
/// By extension, this will change how a RangeCollection is parsed into a RangeCollectionCollection using the latter's
/// GetInstance(RangeCollection) initializer.
/// </summary>
/// <param name="ranges">A range or the string empty. \"empty\" will return an empty range.</param>
/// <returns>a new RangeCollection</returns>
public static RangeCollection Parse(string ranges)
{
ranges = ranges.Trim();
RangeCollection aRangeCollection = new RangeCollection();
aRangeCollection.InternalParse(ranges);
return(aRangeCollection);
}
/// <summary>
/// Returns a collection of elements at what would be the i'th element for i \in rangeCollectionOfIndeces.
/// </summary>
/// <param name="rangeCollectionOfIndeces">0-based indeces.</param>
public RangeCollection ElementsAt(RangeCollection rangeCollectionOfIndeces)
{
RangeCollection result = new RangeCollection();
foreach (KeyValuePair <long, long> range in rangeCollectionOfIndeces.Ranges)
{
result.AddRangeCollection(ElementsAt(range.Key, range.Value));
}
return(result);
}
/// <summary>
/// Add the integers of one RangeCollection to this RangeCollection.
/// </summary>
/// <param name="rangeCollection">The RangeCollection to add</param>
/// <returns>true of all the elements added are new; otherwise, false</returns>
public bool TryAddRangeCollection(RangeCollection rangeCollection)
{
bool allNew = true;
foreach (KeyValuePair <long, long> startAndLast in rangeCollection.Ranges)
{
allNew &= TryAdd(startAndLast.Key, startAndLast.Value - startAndLast.Key + 1);
}
return(allNew);
}
/// <summary>
/// Tells if this RangeCollection is a superset of another. An an equal RangeCollection is a superset.
/// </summary>
/// <param name="rangeCollection">The RangeCollection that may be the subset</param>
/// <returns>true, if this RangeCollection is a superset; otherwise, false</returns>
public bool Contains(RangeCollection rangeCollection)
{
foreach (KeyValuePair <long, long> range in this.Ranges)
{
if (!Contains(range.Key, range.Value))
{
return(false);
}
}
return(true);
}
static public void Test()
{
RangeCollection aRangeCollection = new RangeCollection();
aRangeCollection.Add(0);
Helper.CheckCondition("0" == aRangeCollection.ToString());
aRangeCollection.Add(1);
Helper.CheckCondition("0-1" == aRangeCollection.ToString());
aRangeCollection.Add(4);
Helper.CheckCondition("0-1,4" == aRangeCollection.ToString());
aRangeCollection.Add(5);
Helper.CheckCondition("0-1,4-5" == aRangeCollection.ToString());
aRangeCollection.Add(7);
Helper.CheckCondition("0-1,4-5,7" == aRangeCollection.ToString());
aRangeCollection.Add(2);
Helper.CheckCondition("0-2,4-5,7" == aRangeCollection.ToString());
aRangeCollection.Add(3);
Helper.CheckCondition("0-5,7" == aRangeCollection.ToString());
aRangeCollection.Add(6);
Helper.CheckCondition("0-7" == aRangeCollection.ToString());
aRangeCollection.Add(-10);
Helper.CheckCondition("-10,0-7" == aRangeCollection.ToString());
aRangeCollection.Add(-5);
Helper.CheckCondition("-10,-5,0-7" == aRangeCollection.ToString());
string range = "-10--5,-3,-2-1,1-5,7-12,13-15,14-16,20-25,22-23";
aRangeCollection = RangeCollection.Parse(range);
Console.WriteLine(range);
Console.WriteLine(aRangeCollection);
range = "1-5,0,4-10,-10--5,-12--3,15-20,12-21,-13";
aRangeCollection = RangeCollection.Parse(range);
Console.WriteLine(range);
Console.WriteLine(aRangeCollection);
Console.WriteLine("Count: " + aRangeCollection.Count());
Console.WriteLine("Count -5 to 2: " + aRangeCollection.Count(-5, 2));
//RangeCollectionCollection rcc = RangeCollectionCollection.GetInstance(aRangeCollection);
//Console.WriteLine(rcc);
//Console.WriteLine(rcc.GetContainingRangeCollection(-12));
//Console.WriteLine(rcc.GetContainingRangeCollection(-10));
//Console.WriteLine(rcc.GetContainingRangeCollection(-5));
//Console.WriteLine(rcc.GetContainingRangeCollection(3));
//Console.WriteLine(rcc.GetContainingRangeCollection(15));
}
/// <summary>
/// Tests equality between two range collections
/// </summary>
/// <param name="rangeCollection">The range collection we're testing against</param>
/// <returns>True if and only if the ranges are identical</returns>
public bool Equals(RangeCollection rangeCollection)
{
if (null == rangeCollection)
{
return(false);
}
if (!_startItems.SequenceEqual(rangeCollection._startItems))
{
return(false);
}
if (!_itemToLength.Keys.SequenceEqual(rangeCollection._itemToLength.Keys))
{
return(false);
}
if (!_itemToLength.Values.SequenceEqual(rangeCollection._itemToLength.Values))
{
return(false);
}
return(true);
}
/// <summary>
/// Create a RangeCollection by doing a deep copy of a RangeCollection
/// </summary>
/// <param name="rangeCollection">A new RangeCollection</param>
public RangeCollection(RangeCollection rangeCollection)
: this()
{
_startItems = new List <long>(rangeCollection._startItems);
_itemToLength = new SortedDictionary <long, long>(rangeCollection._itemToLength);
}
/// <summary>
/// Add the integers of one RangeCollection to this RangeCollection.
/// </summary>
/// <param name="rangeCollection">The RangeCollection to add</param>
public void AddRangeCollection(RangeCollection rangeCollection)
{
TryAddRangeCollection(rangeCollection);
}
