예제 #1
0
        // gets the text from a text source, directly retrieving the underlying rope where possible
        static IEnumerable <char> GetTextFromTextSource(ITextSource textSource)
        {
            if (textSource == null)
            {
                throw new ArgumentNullException("textSource");
            }

            if (textSource is ReadOnlyDocument)
            {
                textSource = textSource.CreateSnapshot();                 // retrieve underlying text source, which might be a RopeTextSource
            }
            RopeTextSource rts = textSource as RopeTextSource;

            if (rts != null)
            {
                return(rts.GetRope());
            }

            TextDocument doc = textSource as TextDocument;

            if (doc != null)
            {
                return(doc.rope);
            }

            return(textSource.Text);
        }
예제 #2
0
        void DoReplace(int offset, int length, ITextSource newText, OffsetChangeMap offsetChangeMap)
        {
            if (length == 0 && newText.TextLength == 0)
            {
                return;
            }

            // trying to replace a single character in 'Normal' mode?
            // for single characters, 'CharacterReplace' mode is equivalent, but more performant
            // (we don't have to touch the anchorTree at all in 'CharacterReplace' mode)
            if (length == 1 && newText.TextLength == 1 && offsetChangeMap == null)
            {
                offsetChangeMap = OffsetChangeMap.Empty;
            }

            ITextSource removedText;

            if (length == 0)
            {
                removedText = StringTextSource.Empty;
            }
            else if (length < 100)
            {
                removedText = new StringTextSource(rope.ToString(offset, length));
            }
            else
            {
                // use a rope if the removed string is long
                removedText = new RopeTextSource(rope.GetRange(offset, length));
            }
            DocumentChangeEventArgs args = new DocumentChangeEventArgs(offset, removedText, newText, offsetChangeMap);

            // fire DocumentChanging event
            if (Changing != null)
            {
                Changing(this, args);
            }
            if (textChanging != null)
            {
                textChanging(this, args);
            }

            undoStack.Push(this, args);

            cachedText      = null;        // reset cache of complete document text
            fireTextChanged = true;
            DelayedEvents delayedEvents = new DelayedEvents();

            lock (lockObject) {
                // create linked list of checkpoints
                versionProvider.AppendChange(args);

                // now update the textBuffer and lineTree
                if (offset == 0 && length == rope.Length)
                {
                    // optimize replacing the whole document
                    rope.Clear();
                    var newRopeTextSource = newText as RopeTextSource;
                    if (newRopeTextSource != null)
                    {
                        rope.InsertRange(0, newRopeTextSource.GetRope());
                    }
                    else
                    {
                        rope.InsertText(0, newText.Text);
                    }
                    lineManager.Rebuild();
                }
                else
                {
                    rope.RemoveRange(offset, length);
                    lineManager.Remove(offset, length);
                                        #if DEBUG
                    lineTree.CheckProperties();
                                        #endif
                    var newRopeTextSource = newText as RopeTextSource;
                    if (newRopeTextSource != null)
                    {
                        rope.InsertRange(offset, newRopeTextSource.GetRope());
                    }
                    else
                    {
                        rope.InsertText(offset, newText.Text);
                    }
                    lineManager.Insert(offset, newText);
                                        #if DEBUG
                    lineTree.CheckProperties();
                                        #endif
                }
            }

            // update text anchors
            if (offsetChangeMap == null)
            {
                anchorTree.HandleTextChange(args.CreateSingleChangeMapEntry(), delayedEvents);
            }
            else
            {
                foreach (OffsetChangeMapEntry entry in offsetChangeMap)
                {
                    anchorTree.HandleTextChange(entry, delayedEvents);
                }
            }

            lineManager.ChangeComplete(args);

            // raise delayed events after our data structures are consistent again
            delayedEvents.RaiseEvents();

            // fire DocumentChanged event
            if (Changed != null)
            {
                Changed(this, args);
            }
            if (textChanged != null)
            {
                textChanged(this, args);
            }
        }