1 files changed, 144 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/SimpleSelection.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/SimpleSelection.cs
new file mode 100644
index 000000000..132b09e20
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/SimpleSelection.cs
@@ -0,0 +1,144 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using Tango.Scripting.Editors.Document;
+using Tango.Scripting.Editors.Utils;
+
+namespace Tango.Scripting.Editors.Editing
+{
+	/// <summary>
+	/// A simple selection.
+	/// </summary>
+	sealed class SimpleSelection : Selection
+	{
+		readonly TextViewPosition start, end;
+		readonly int startOffset, endOffset;
+		
+		/// <summary>
+		/// Creates a new SimpleSelection instance.
+		/// </summary>
+		internal SimpleSelection(TextArea textArea, TextViewPosition start, TextViewPosition end)
+			: base(textArea)
+		{
+			this.start = start;
+			this.end = end;
+			this.startOffset = textArea.Document.GetOffset(start.Location);
+			this.endOffset = textArea.Document.GetOffset(end.Location);
+		}
+		
+		/// <inheritdoc/>
+		public override IEnumerable<SelectionSegment> Segments {
+			get {
+				return ExtensionMethods.Sequence<SelectionSegment>(new SelectionSegment(startOffset, start.VisualColumn, endOffset, end.VisualColumn));
+			}
+		}
+		
+		/// <inheritdoc/>
+		public override ISegment SurroundingSegment {
+			get {
+				return new SelectionSegment(startOffset, endOffset);
+			}
+		}
+		
+		/// <inheritdoc/>
+		public override void ReplaceSelectionWithText(string newText)
+		{
+			if (newText == null)
+				throw new ArgumentNullException("newText");
+			using (textArea.Document.RunUpdate()) {
+				ISegment[] segmentsToDelete = textArea.GetDeletableSegments(this.SurroundingSegment);
+				for (int i = segmentsToDelete.Length - 1; i >= 0; i--) {
+					if (i == segmentsToDelete.Length - 1) {
+						if (segmentsToDelete[i].Offset == SurroundingSegment.Offset && segmentsToDelete[i].Length == SurroundingSegment.Length) {
+							newText = AddSpacesIfRequired(newText, start, end);
+						}
+						int vc = textArea.Caret.VisualColumn;
+						textArea.Caret.Offset = segmentsToDelete[i].EndOffset;
+						if (string.IsNullOrEmpty(newText))
+							textArea.Caret.VisualColumn = vc;
+						textArea.Document.Replace(segmentsToDelete[i], newText);
+					} else {
+						textArea.Document.Remove(segmentsToDelete[i]);
+					}
+				}
+				if (segmentsToDelete.Length != 0) {
+					textArea.ClearSelection();
+				}
+			}
+		}
+		
+		public override TextViewPosition StartPosition {
+			get { return start; }
+		}
+		
+		public override TextViewPosition EndPosition {
+			get { return end; }
+		}
+		
+		/// <inheritdoc/>
+		public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
+		{
+			if (e == null)
+				throw new ArgumentNullException("e");
+			return Selection.Create(
+				textArea,
+				new TextViewPosition(textArea.Document.GetLocation(e.GetNewOffset(startOffset, AnchorMovementType.Default)), start.VisualColumn),
+				new TextViewPosition(textArea.Document.GetLocation(e.GetNewOffset(endOffset, AnchorMovementType.Default)), end.VisualColumn)
+			);
+		}
+		
+		/// <inheritdoc/>
+		public override bool IsEmpty {
+			get { return startOffset == endOffset; }
+		}
+		
+		/// <inheritdoc/>
+		public override int Length {
+			get {
+				return Math.Abs(endOffset - startOffset);
+			}
+		}
+		
+		/// <inheritdoc/>
+		public override Selection SetEndpoint(TextViewPosition endPosition)
+		{
+			return Create(textArea, start, endPosition);
+		}
+		
+		public override Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
+		{
+			var document = textArea.Document;
+			if (document == null)
+				throw ThrowUtil.NoDocumentAssigned();
+			return Create(textArea, start, endPosition);
+		}
+		
+		/// <inheritdoc/>
+		public override int GetHashCode()
+		{
+			unchecked {
+				return startOffset * 27811 + endOffset + textArea.GetHashCode();
+			}
+		}
+		
+		/// <inheritdoc/>
+		public override bool Equals(object obj)
+		{
+			SimpleSelection other = obj as SimpleSelection;
+			if (other == null) return false;
+			return this.start.Equals(other.start) && this.end.Equals(other.end)
+				&& this.startOffset == other.startOffset && this.endOffset == other.endOffset
+				&& this.textArea == other.textArea;
+		}
+		
+		/// <inheritdoc/>
+		public override string ToString()
+		{
+			return "[SimpleSelection Start=" + start + " End=" + end + "]";
+		}
+	}
+}