private static IReadOnlyList <ImmutableArray <TextChangeRange> > GetChangesBetween(
SourceText oldText,
ChangedText newText
)
{
var list = new List <ImmutableArray <TextChangeRange> >();
ChangeInfo?change = newText._info;
list.Add(change.ChangeRanges);
while (change != null)
{
SourceText?actualOldText;
change.WeakOldText.TryGetTarget(out actualOldText);
if (actualOldText == oldText)
{
return(list);
}
change = change.Previous;
if (change != null)
{
list.Insert(0, change.ChangeRanges);
}
}
// did not find old text, so not connected?
list.Clear();
return(list);
}
public override SourceText WithChanges(IEnumerable <TextChange> changes)
{
// compute changes against newText to avoid capturing strong references to this ChangedText instance.
// _newText will only ever be one of CompositeText, SubText, StringText or LargeText, so calling WithChanges on it
// will either produce a ChangeText instance or the original instance in case of a empty change.
ChangedText changed = _newText.WithChanges(changes) as ChangedText;
if (changed != null)
{
return(new ChangedText(this, changed._newText, changed._info.ChangeRanges));
}
else
{
// change was empty, so just return this same instance
return(this);
}
}
private static IReadOnlyList<ImmutableArray<TextChangeRange>> GetChangesBetween(SourceText oldText, ChangedText newText)
{
var list = new List<ImmutableArray<TextChangeRange>>();
var change = newText._info;
list.Add(change.ChangeRanges);
while (change != null)
{
SourceText actualOldText;
change.WeakOldText.TryGetTarget(out actualOldText);
if (actualOldText == oldText)
{
return list;
}
change = change.Previous;
if (change != null)
{
list.Insert(0, change.ChangeRanges);
}
}
// did not find old text, so not connected?
list.Clear();
return list;
}
public static ImmutableArray <TextChangeRange> Merge(ImmutableArray <TextChangeRange> oldChanges, ImmutableArray <TextChangeRange> newChanges) => ChangedText.Merge(oldChanges, newChanges);