/// <returns>wrapper around B that includes cached hash codes.</returns>
public virtual HashedSequence <S> GetB()
{
if (cachedB == null)
{
cachedB = Wrap(baseB);
}
return(cachedB);
}
/// <returns>wrapper around A that includes cached hash codes.</returns>
public virtual HashedSequence <S> GetA()
{
if (cachedA == null)
{
cachedA = Wrap(baseA);
}
return(cachedA);
}
internal State(HistogramDiff _enclosing, EditList edits, HashedSequenceComparator
<S> cmp, HashedSequence <S> a, HashedSequence <S> b)
{
this._enclosing = _enclosing;
this.cmp = cmp;
this.a = a;
this.b = b;
this.edits = edits;
}
private MyersDiff(EditList edits, HashedSequenceComparator <S> cmp, HashedSequence
<S> a, HashedSequence <S> b, Edit region)
{
middle = new MyersDiff <S> .MiddleEdit(this);
this.edits = edits;
this.cmp = cmp;
this.a = a;
this.b = b;
CalculateEdits(region);
}
public override EditList DiffNonCommon <S>(SequenceComparator <S> cmp, S a,
S b)
{
HashedSequencePair <S> p = new HashedSequencePair <S>(cmp, a, b);
HashedSequenceComparator <S> hc = p.GetComparator();
HashedSequence <S> ha = p.GetA();
HashedSequence <S> hb = p.GetB();
p = null;
EditList res = new EditList();
Edit region = new Edit(0, a.Size(), 0, b.Size());
DiffNonCommon(res, hc, ha, hb, region);
return(res);
}
internal HistogramDiffIndex(int maxChainLength, HashedSequenceComparator <S> cmp,
HashedSequence <S> a, HashedSequence <S> b, Edit r)
{
this.maxChainLength = maxChainLength;
this.cmp = cmp;
this.a = a;
this.b = b;
this.region = r;
if (region.endA >= MAX_PTR)
{
throw new ArgumentException(JGitText.Get().sequenceTooLargeForDiffAlgorithm);
}
int sz = r.GetLengthA();
int tableBits = TableBits(sz);
table = new int[1 << tableBits];
keyShift = 32 - tableBits;
ptrShift = r.beginA;
recs = new long[Math.Max(4, (int)(((uint)sz) >> 3))];
next = new int[sz];
recIdx = new int[sz];
}
private int Hash(HashedSequence <S> s, int idx)
{
return((int)(((uint)(cmp.Hash(s, idx) *unchecked ((int)(0x9e370001)))) >> keyShift
));
}
public override void DiffNonCommon <S>(EditList edits, HashedSequenceComparator <S>
cmp, HashedSequence <S> a, HashedSequence <S> b, Edit region)
{
new HistogramDiff.State <S>(this, edits, cmp, a, b).DiffReplace(region);
}
/// <summary>Compare two sequences and identify a list of edits between them.</summary>
/// <remarks>
/// Compare two sequences and identify a list of edits between them.
/// This method should be invoked only after the two sequences have been
/// proven to have no common starting or ending elements. The expected
/// elimination of common starting and ending elements is automatically
/// performed by the
/// <see cref="DiffAlgorithm.Diff{S}(SequenceComparator{S}, Sequence, Sequence)">DiffAlgorithm.Diff<S>(SequenceComparator<S>, Sequence, Sequence)
/// </see>
/// method, which invokes this method using
/// <see cref="Subsequence{S}">Subsequence<S></see>
/// s.
/// </remarks>
/// <?></?>
/// <param name="edits">result list to append the region's edits onto.</param>
/// <param name="cmp">the comparator supplying the element equivalence function.</param>
/// <param name="a">
/// the first (also known as old or pre-image) sequence. Edits
/// returned by this algorithm will reference indexes using the
/// 'A' side:
/// <see cref="Edit.GetBeginA()">Edit.GetBeginA()</see>
/// ,
/// <see cref="Edit.GetEndA()">Edit.GetEndA()</see>
/// .
/// </param>
/// <param name="b">
/// the second (also known as new or post-image) sequence. Edits
/// returned by this algorithm will reference indexes using the
/// 'B' side:
/// <see cref="Edit.GetBeginB()">Edit.GetBeginB()</see>
/// ,
/// <see cref="Edit.GetEndB()">Edit.GetEndB()</see>
/// .
/// </param>
/// <param name="region">the region being compared within the two sequences.</param>
public abstract void DiffNonCommon <S>(EditList edits, HashedSequenceComparator <S>
cmp, HashedSequence <S> a, HashedSequence <S> b, Edit region) where S : Sequence;
public override int Hash(HashedSequence <S> seq, int ptr)
{
return(seq.hashes[ptr]);
}
public override bool Equals(HashedSequence <S> a, int ai, HashedSequence <S> b, int
bi)
{
//
return(a.hashes[ai] == b.hashes[bi] && cmp.Equals(a.@base, ai, b.@base, bi));
}
public override void DiffNonCommon <S>(EditList edits, HashedSequenceComparator <S>
cmp, HashedSequence <S> a, HashedSequence <S> b, Edit region)
{
new NGit.Diff.MyersDiff <S>(edits, cmp, a, b, region);
}
