static IStringTransform[] WithdrawSubsequent(Insertion lhs, Insertion rhs)
{
return TuplesToInsertions(StringTransformationOperators.WithdrawSubsequent(Tuple.Create(lhs.Position, lhs.Length, (uint)0),
Tuple.Create(rhs.Position, rhs.Length, (uint)0)), lhs.Contents);
}
static IStringTransform[] WithdrawAntecedent(Deletion lhs, Insertion rhs)
{
return TuplesToDeletions(StringTransformationOperators.WithdrawAntecedent(Tuple.Create(lhs.Position, lhs.Length),
Tuple.Create(rhs.Position, rhs.Length, (uint)0)));
}
static bool TryCoallesce(Insertion antecedent, Insertion subsequent, out IStringTransform[] result)
{
if (subsequent.Position >= antecedent.Position &&
subsequent.Position <= antecedent.Position + antecedent.Length) {
result = new IStringTransform[] {
new Insertion(antecedent.Position,
antecedent.Contents.Substring(0, (int) (subsequent.Position - antecedent.Position)) +
subsequent.Contents +
antecedent.Contents.Substring((int) (subsequent.Position - antecedent.Position)))
};
return true;
}
else {
result = new IStringTransform[] { antecedent, subsequent };
return false;
}
}
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 bool TryCoallesce(Deletion antecedent, Insertion subsequent, out IStringTransform[] result)
{
result = new IStringTransform[] { antecedent, subsequent };
return false;
}
static IStringTransform[] IntroduceSubsequent(Insertion lhs, Deletion rhs)
{
return TuplesToInsertions(StringTransformationOperators.IntroduceSubsequent(Tuple.Create(lhs.Position, lhs.Length, (uint)0),
Tuple.Create(rhs.Position, rhs.Length)), lhs.Contents);
}