1 files changed, 130 insertions, 0 deletions
diff --git a/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor/Projection/Projection.cs b/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor/Projection/Projection.cs
new file mode 100644
index 0000000000..8698e57c4c
--- /dev/null
+++ b/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor/Projection/Projection.cs
@@ -0,0 +1,130 @@
+//
+// Projection.cs
+//
+// Author:
+//       Mike Krüger <mkrueger@xamarin.com>
+//
+// Copyright (c) 2015 Xamarin Inc. (http://xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using MonoDevelop.Ide.Editor;
+using System.Collections.Immutable;
+using MonoDevelop.Core.Text;
+using MonoDevelop.Ide.Gui;
+using MonoDevelop.Ide.TypeSystem;
+using System.Collections.Generic;
+
+namespace MonoDevelop.Ide.Editor.Projection
+{
+	public sealed class Projection
+	{
+		public ITextDocument Document { get; private set; }
+
+		SegmentTree<ProjectedTreeSegment> originalProjections  = new SegmentTree<ProjectedTreeSegment> ();
+		SegmentTree<ProjectedTreeSegment> projectedProjections = new SegmentTree<ProjectedTreeSegment> ();
+
+		class ProjectedTreeSegment : TreeSegment
+		{
+			public ProjectedTreeSegment LinkedTo { get; set; }
+
+			public ProjectedTreeSegment (int offset, int length) : base (offset, length)
+			{
+			}
+		}
+
+		public IEnumerable<ProjectedSegment> ProjectedSegments {
+			get {
+				foreach (var treeSeg in originalProjections) {
+					yield return new ProjectedSegment (treeSeg.Offset, treeSeg.LinkedTo.Offset, treeSeg.Length);
+				}
+			}
+		}
+
+		TextEditor projectedEditor;
+
+		internal TextEditor ProjectedEditor
+		{
+			get
+			{
+				return projectedEditor;
+			}
+		}
+
+		ProjectedDocumentContext projectedDocumentContext;
+		TextEditor attachedEditor;
+
+		internal DocumentContext ProjectedContext {
+			get {
+				return projectedDocumentContext;
+			}
+		}
+
+		public TextEditor CreateProjectedEditor (DocumentContext originalContext)
+		{
+			if (projectedEditor == null) {
+				projectedEditor = TextEditorFactory.CreateNewEditor (Document);
+				projectedDocumentContext = new ProjectedDocumentContext (projectedEditor, originalContext);
+				projectedEditor.InitializeExtensionChain (projectedDocumentContext);
+				projectedProjections.InstallListener (projectedEditor);
+			}
+			return projectedEditor;
+		}
+
+		public Projection (ITextDocument document, IReadOnlyList<ProjectedSegment> projectedSegments)
+		{
+			if (document == null)
+				throw new ArgumentNullException (nameof (document));
+			this.Document = document;
+
+			for (int i = 0; i < projectedSegments.Count; i++) {
+				var p = projectedSegments [i];
+				var original = new ProjectedTreeSegment (p.Offset, p.Length);
+				var projected =  new ProjectedTreeSegment (p.ProjectedOffset, p.Length);
+				original.LinkedTo = projected;
+				projected.LinkedTo = original;
+				originalProjections.Add (original);
+				projectedProjections.Add (projected);
+			}
+		}
+
+		internal void Dettach ()
+		{
+			attachedEditor.TextChanged -= HandleTextChanged;
+		}
+
+		internal void Attach (TextEditor textEditor)
+		{
+			attachedEditor = textEditor;
+			attachedEditor.TextChanged += HandleTextChanged;
+		}
+
+		void HandleTextChanged (object sender, TextChangeEventArgs e)
+		{
+			foreach (var segment in originalProjections) {
+				if (segment.Contains (e.Offset)) {
+					var projectedOffset = e.Offset - segment.Offset + segment.LinkedTo.Offset;
+					projectedEditor.ReplaceText (projectedOffset, e.RemovalLength, e.InsertedText);
+				}
+			}
+
+			originalProjections.UpdateOnTextReplace (sender, e);
+		}
+	}
+}
+\ No newline at end of file