DocumentChangedEventArgs ComputeChanges(ISassStylesheet previous, ISassStylesheet current, ITextSnapshot snapshot, SingleTextChange change)
{
if (previous == null)
return new DocumentChangedEventArgs { Stylesheet = current, ChangeStart = 0, ChangeEnd = snapshot.Length };
int start = 0;
int end = Math.Min(change.Position + change.InsertedLength, snapshot.Length);
// we need to scan both trees until we find where they start lining up again
var offset = change.InsertedLength + (-1 * change.DeletedLength);
var original = previous.Children.FindItemContainingPosition(change.Position - change.DeletedLength) ?? previous as Stylesheet;
var updated = current.Children.FindItemContainingPosition(change.Position + change.InsertedLength) ?? current as Stylesheet;
if (original != null && updated != null)
start = updated.Start;
while (true)
{
if (original == null || updated == null)
break;
// update our positions
start = Math.Min(start, updated.Start);
end = Math.Max(end, updated.End);
if (original.GetType() == updated.GetType())
{
// there are two types of changes (adding characters or removing characters)
// if we added characters then we'll need to adjust end characters
// if we deleted characters then we'll need to offset starting characters OR ending characters
// checking for length being extended by adding characters
if (original.Start == updated.Start && (original.End + change.InsertedLength) == updated.End)
{
end = updated.End;
break;
}
// checking for length being shortened by deleting characters
else if (original.Start == updated.Start && (original.End - change.DeletedLength) == updated.End)
{
break;
}
// checking for removal of nodes?
else if (original.Start == (updated.Start - change.DeletedLength) && (original.End - change.DeletedLength) == updated.End)
{
break;
}
}
original = original.InOrderSuccessor();
updated = updated.InOrderSuccessor();
}
return new DocumentChangedEventArgs
{
Stylesheet = current,
ChangeStart = Math.Min(start, change.Position),
ChangeEnd = Math.Max(end, change.Position + change.InsertedLength)
};
}
private ICompletionContext CreateCompletionContext(ISassStylesheet stylesheet, int position, ITextSnapshot snapshot)
{
ParseItem current = stylesheet as Stylesheet;
if (position >= 0)
{
var previousCharacterIndex = FindPreceedingCharacter(position-1, snapshot);
if (previousCharacterIndex != position)
current = stylesheet.Children.FindItemContainingPosition(previousCharacterIndex);
current = current ?? stylesheet.Children.FindItemContainingPosition(position);
if (current is TokenItem)
current = current.Parent;
if (current != null && !IsUnclosed(current) && previousCharacterIndex != position)
{
current = stylesheet.Children.FindItemContainingPosition(position);
if (current is TokenItem)
current = current.Parent;
}
}
current = current ?? stylesheet as Stylesheet;
return new CompletionContext
{
Document = Editor.Document,
Current = current,
//Predecessor = predecessor,
Position = position,
Cache = Cache,
DocumentTextProvider = new SnapshotTextProvider(snapshot)
};
}
public void Update(ISassStylesheet stylesheet, ITextProvider text)
{
var container = new StylesheetContainer(IntellisenseManager);
foreach (var item in stylesheet.Children)
container.Add(item, text);
Container = container;
}
private void OnStylesheetChanged(ISassStylesheet previous, ISassStylesheet current)
{
var handler = StylesheetChanged;
if (handler != null)
{
handler(this, new StylesheetChangedEventArgs(previous, current));
}
}
public void Update(ISassStylesheet stylesheet, ITextProvider text)
{
var container = new StylesheetContainer(IntellisenseManager);
foreach (var item in stylesheet.Children)
{
container.Add(item, text);
}
Container = container;
}
public ISassStylesheet Update(ISassStylesheet stylesheet)
{
lock (locker)
{
var previous = Stylesheet;
Stylesheet = stylesheet;
if (Stylesheet != null)
Stylesheet.Owner = this;
//DumpTree(stylesheet.Children, 0);
OnStylesheetChanged(previous, stylesheet);
if (previous != null)
previous.Owner = null;
return previous;
}
}
void ProcessRequests()
{
while (!ShutdownToken.IsCancellationRequested)
{
try
{
BackgroundParseRequest request;
if (Requests.TryTake(out request, -1, ShutdownToken))
{
try
{
var source = request.Document.Source;
source.Refresh();
if (source.Exists)
{
ISassStylesheet stylesheet = null;
var textManager = new FileTextManager(source);
using (var scope = textManager.Open())
{
var parser = ParserFactory.Create();
stylesheet = parser.Parse(new FileParsingRequest(scope.Text, request.Document));
}
if (stylesheet != null)
{
request.Document.Update(stylesheet);
}
}
}
catch (Exception ex)
{
Logger.Log(ex, "Failed to process background document parse request.");
}
}
}
catch (OperationCanceledException)
{
// ignore
return;
}
}
}
public ISassStylesheet Update(ISassStylesheet stylesheet)
{
lock (locker)
{
var previous = Stylesheet;
Stylesheet = stylesheet;
if (Stylesheet != null)
{
Stylesheet.Owner = this;
}
//DumpTree(stylesheet.Children, 0);
OnStylesheetChanged(previous, stylesheet);
if (previous != null)
{
previous.Owner = null;
}
return(previous);
}
}
private ICompletionContext CreateCompletionContext(ISassStylesheet stylesheet, int position, ITextSnapshot snapshot)
{
ParseItem current = stylesheet as Stylesheet;
if (position >= 0)
{
var previousCharacterIndex = FindPreceedingCharacter(position - 1, snapshot);
if (previousCharacterIndex != position)
{
current = stylesheet.Children.FindItemContainingPosition(previousCharacterIndex);
}
current = current ?? stylesheet.Children.FindItemContainingPosition(position);
if (current is TokenItem)
{
current = current.Parent;
}
if (current != null && !IsUnclosed(current) && previousCharacterIndex != position)
{
current = stylesheet.Children.FindItemContainingPosition(position);
if (current is TokenItem)
{
current = current.Parent;
}
}
}
current = current ?? stylesheet as Stylesheet;
return(new CompletionContext
{
Document = Editor.Document,
Current = current,
//Predecessor = predecessor,
Position = position,
Cache = Cache,
DocumentTextProvider = new SnapshotTextProvider(snapshot)
});
}
private void OnStylesheetChanged(ISassStylesheet previous, ISassStylesheet current)
{
var handler = StylesheetChanged;
if (handler != null)
handler(this, new StylesheetChangedEventArgs(previous, current));
}
public StylesheetChangedEventArgs(ISassStylesheet previous, ISassStylesheet current)
{
Previous = previous;
Current = current;
}
DocumentChangedEventArgs ComputeChanges(ISassStylesheet previous, ISassStylesheet current, ITextSnapshot snapshot, SingleTextChange change)
{
if (previous == null)
{
return new DocumentChangedEventArgs {
Stylesheet = current, ChangeStart = 0, ChangeEnd = snapshot.Length
}
}
;
int start = 0;
int end = Math.Min(change.Position + change.InsertedLength, snapshot.Length);
// we need to scan both trees until we find where they start lining up again
var offset = change.InsertedLength + (-1 * change.DeletedLength);
var original = previous.Children.FindItemContainingPosition(change.Position - change.DeletedLength) ?? previous as Stylesheet;
var updated = current.Children.FindItemContainingPosition(change.Position + change.InsertedLength) ?? current as Stylesheet;
if (original != null && updated != null)
{
start = updated.Start;
}
while (true)
{
if (original == null || updated == null)
{
break;
}
// update our positions
start = Math.Min(start, updated.Start);
end = Math.Max(end, updated.End);
if (original.GetType() == updated.GetType())
{
// there are two types of changes (adding characters or removing characters)
// if we added characters then we'll need to adjust end characters
// if we deleted characters then we'll need to offset starting characters OR ending characters
// checking for length being extended by adding characters
if (original.Start == updated.Start && (original.End + change.InsertedLength) == updated.End)
{
end = updated.End;
break;
}
// checking for length being shortened by deleting characters
else if (original.Start == updated.Start && (original.End - change.DeletedLength) == updated.End)
{
break;
}
// checking for removal of nodes?
else if (original.Start == (updated.Start - change.DeletedLength) && (original.End - change.DeletedLength) == updated.End)
{
break;
}
}
original = original.InOrderSuccessor();
updated = updated.InOrderSuccessor();
}
return(new DocumentChangedEventArgs
{
Stylesheet = current,
ChangeStart = Math.Min(start, change.Position),
ChangeEnd = Math.Max(end, change.Position + change.InsertedLength)
});
}