static IStringTransform[] WithrdawAntecedent(Deletion lhs, Deletion rhs)
{
return
TuplesToDeletions(StringTransformationOperators.WithdrawAntecedent(Tuple.Create(lhs.Position, lhs.Length),
Tuple.Create(rhs.Length, rhs.Position)));
}
static bool TryCoallesce(Insertion antecedent, Deletion subsequent, out IStringTransform[] result)
{
uint lengthReduction = Math.Max(0,
Math.Min(antecedent.Position + antecedent.Length, subsequent.Position + subsequent.Length) -
Math.Max(antecedent.Position, subsequent.Position));
if (lengthReduction > 0) {
List<IStringTransform> temp = new List<IStringTransform>(2);
if (lengthReduction < antecedent.Length) {
temp.Add(new Insertion(Math.Min(antecedent.Position, subsequent.Position),
antecedent.Contents.Remove((int) Math.Max((uint) 0, subsequent.Position - antecedent.Position),
(int) lengthReduction)));
}
if (lengthReduction < subsequent.Length) {
temp.Add(new Deletion(subsequent.Position, subsequent.Length - lengthReduction));
}
result = temp.ToArray();
return true;
} else {
result = new IStringTransform[] {antecedent, subsequent};
return false;
}
}
static IStringTransform[] WithdrawSubsequent(Insertion lhs, Deletion rhs)
{
return TuplesToInsertions(StringTransformationOperators.WithdrawSubsequent(Tuple.Create(lhs.Position, lhs.Length, (uint)0),
Tuple.Create(rhs.Position, rhs.Length)), lhs.Contents);
}
static bool TryCoallesce(Deletion antecedent, Insertion subsequent, out IStringTransform[] result)
{
result = new IStringTransform[] { antecedent, subsequent };
return false;
}
static bool TryCoallesce(Deletion antecedent, Deletion subsequent, out IStringTransform[] result)
{
if (subsequent.Position == antecedent.Position) {
result = new IStringTransform[]
{new Deletion(antecedent.Position, antecedent.Length + subsequent.Length)};
return true;
} else {
result = new IStringTransform[] {antecedent, subsequent};
return false;
}
}
static IStringTransform[] IntroduceSubsequent(Deletion lhs, Insertion rhs)
{
return TuplesToDeletions(StringTransformationOperators.IntroduceSubsequent(Tuple.Create(lhs.Position, lhs.Length),
Tuple.Create(rhs.Position, rhs.Length, (uint)0)));
}
static IStringTransform[] IntroduceAntecedent(Insertion lhs, Deletion rhs)
{
return TuplesToInsertions(StringTransformationOperators.IntroduceAntecedent(Tuple.Create(lhs.Position, lhs.Length, (uint)0),
Tuple.Create(rhs.Position, rhs.Length)), lhs.Contents);
}
static IStringTransform[] IntroduceAntecedent(Deletion lhs, Deletion rhs)
{
return TuplesToDeletions(StringTransformationOperators.IntroduceAntecedent(Tuple.Create(lhs.Position, lhs.Length),
Tuple.Create(rhs.Position, rhs.Length)));
}