private void AddChangeType(List <Diff3Change> changes, Diff3Change change)
{
AddChangeType(changes, change.ChangeType, change.Base, change.From1, change.From2, change.IsBaseEqualFrom1, change.IsBaseEqualFrom2);
}
private void AddChangeType(List <Diff3Change> changes, Diff3ChangeType changeType, Span baseSpan, Span v1Index, Span v2Index, bool?baseEqualFrom1, bool?baseEqualFrom2)
{
bool addNew = changes.Count == 0;
if (!addNew)
{
var previousChange = changes[changes.Count - 1];
if (previousChange.ChangeType == changeType)
{
bool keepPrevious = false;
if (previousChange.Base == baseSpan && (previousChange.From1 != Span.Invalid || previousChange.From2 != Span.Invalid))
{
if (previousChange.From1.CanMergeWith(v1Index) && (!previousChange.IsBaseEqualFrom1.HasValue || baseEqualFrom1 == previousChange.IsBaseEqualFrom1))
{
previousChange.From1 = Span.Merge(previousChange.From1, v1Index);
previousChange.IsBaseEqualFrom1 = baseEqualFrom1;
keepPrevious = true;
}
if (previousChange.From2.CanMergeWith(v2Index) && (!previousChange.IsBaseEqualFrom2.HasValue || baseEqualFrom2 == previousChange.IsBaseEqualFrom2))
{
previousChange.From2 = Span.Merge(previousChange.From2, v2Index);
previousChange.IsBaseEqualFrom2 = baseEqualFrom2;
keepPrevious = true;
}
}
else
{
if (previousChange.Base.CanMergeWith(baseSpan))
{
keepPrevious = true;
}
if (previousChange.From1.CanMergeWith(v1Index))
{
previousChange.From1 = Span.Merge(previousChange.From1, v1Index);
previousChange.IsBaseEqualFrom1 = null;
keepPrevious = true;
}
if (previousChange.From2.CanMergeWith(v2Index))
{
previousChange.From2 = Span.Merge(previousChange.From2, v2Index);
previousChange.IsBaseEqualFrom2 = null;
keepPrevious = true;
}
}
if (keepPrevious)
{
previousChange.Base = Span.Merge(previousChange.Base, baseSpan);
}
else
{
addNew = true;
}
}
else
{
addNew = true;
}
}
if (addNew)
{
var diff3 = new Diff3Change()
{
Base = baseSpan,
From1 = v1Index,
From2 = v2Index,
ChangeType = changeType
};
if (baseEqualFrom1.HasValue)
{
diff3.IsBaseEqualFrom1 = baseEqualFrom1.Value;
}
if (baseEqualFrom2.HasValue)
{
diff3.IsBaseEqualFrom2 = baseEqualFrom2.Value;
}
changes.Add(diff3);
}
}