1 files changed, 268 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/Selection.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/Selection.cs
new file mode 100644
index 000000000..014fa8680
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+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/Selection.cs
@@ -0,0 +1,268 @@
+// 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.Text;
+using System.Windows;
+using Tango.Scripting.Editors.Document;
+using Tango.Scripting.Editors.Highlighting;
+using Tango.Scripting.Editors.Utils;
+
+namespace Tango.Scripting.Editors.Editing
+{
+	/// <summary>
+	/// Base class for selections.
+	/// </summary>
+	public abstract class Selection
+	{
+		/// <summary>
+		/// Creates a new simple selection that selects the text from startOffset to endOffset.
+		/// </summary>
+		public static Selection Create(TextArea textArea, int startOffset, int endOffset)
+		{
+			if (textArea == null)
+				throw new ArgumentNullException("textArea");
+			if (startOffset == endOffset)
+				return textArea.emptySelection;
+			else
+				return new SimpleSelection(textArea,
+				                           new TextViewPosition(textArea.Document.GetLocation(startOffset)),
+				                           new TextViewPosition(textArea.Document.GetLocation(endOffset)));
+		}
+		
+		internal static Selection Create(TextArea textArea, TextViewPosition start, TextViewPosition end)
+		{
+			if (textArea == null)
+				throw new ArgumentNullException("textArea");
+			if (textArea.Document.GetOffset(start.Location) == textArea.Document.GetOffset(end.Location) && start.VisualColumn == end.VisualColumn)
+				return textArea.emptySelection;
+			else
+				return new SimpleSelection(textArea, start, end);
+		}
+		
+		/// <summary>
+		/// Creates a new simple selection that selects the text in the specified segment.
+		/// </summary>
+		public static Selection Create(TextArea textArea, ISegment segment)
+		{
+			if (segment == null)
+				throw new ArgumentNullException("segment");
+			return Create(textArea, segment.Offset, segment.EndOffset);
+		}
+		
+		internal readonly TextArea textArea;
+		
+		/// <summary>
+		/// Constructor for Selection.
+		/// </summary>
+		protected Selection(TextArea textArea)
+		{
+			if (textArea == null)
+				throw new ArgumentNullException("textArea");
+			this.textArea = textArea;
+		}
+		
+		/// <summary>
+		/// Gets the start position of the selection.
+		/// </summary>
+		public abstract TextViewPosition StartPosition { get; }
+		
+		/// <summary>
+		/// Gets the end position of the selection.
+		/// </summary>
+		public abstract TextViewPosition EndPosition { get; }
+		
+		/// <summary>
+		/// Gets the selected text segments.
+		/// </summary>
+		public abstract IEnumerable<SelectionSegment> Segments { get; }
+		
+		/// <summary>
+		/// Gets the smallest segment that contains all segments in this selection.
+		/// May return null if the selection is empty.
+		/// </summary>
+		public abstract ISegment SurroundingSegment { get; }
+		
+		/// <summary>
+		/// Replaces the selection with the specified text.
+		/// </summary>
+		public abstract void ReplaceSelectionWithText(string newText);
+		
+		internal string AddSpacesIfRequired(string newText, TextViewPosition start, TextViewPosition end)
+		{
+			if (EnableVirtualSpace && InsertVirtualSpaces(newText, start, end)) {
+				var line = textArea.Document.GetLineByNumber(start.Line);
+				string lineText = textArea.Document.GetText(line);
+				var vLine = textArea.TextView.GetOrConstructVisualLine(line);
+				int colDiff = start.VisualColumn - vLine.VisualLengthWithEndOfLineMarker;
+				if (colDiff > 0) {
+					string additionalSpaces = "";
+					if (!textArea.Options.ConvertTabsToSpaces && lineText.Trim('\t').Length == 0) {
+						int tabCount = (int)(colDiff / textArea.Options.IndentationSize);
+						additionalSpaces = new string('\t', tabCount);
+						colDiff -= tabCount * textArea.Options.IndentationSize;
+					}
+					additionalSpaces += new string(' ', colDiff);
+					return additionalSpaces + newText;
+				}
+			}
+			return newText;
+		}
+		
+		bool InsertVirtualSpaces(string newText, TextViewPosition start, TextViewPosition end)
+		{
+			return (!string.IsNullOrEmpty(newText) || !(IsInVirtualSpace(start) && IsInVirtualSpace(end)))
+				&& newText != "\r\n"
+				&& newText != "\n" 
+				&& newText != "\r";
+		}
+		
+		bool IsInVirtualSpace(TextViewPosition pos)
+		{
+			return pos.VisualColumn > textArea.TextView.GetOrConstructVisualLine(textArea.Document.GetLineByNumber(pos.Line)).VisualLength;
+		}
+		
+		/// <summary>
+		/// Updates the selection when the document changes.
+		/// </summary>
+		public abstract Selection UpdateOnDocumentChange(DocumentChangeEventArgs e);
+		
+		/// <summary>
+		/// Gets whether the selection is empty.
+		/// </summary>
+		public virtual bool IsEmpty {
+			get { return Length == 0; }
+		}
+		
+		/// <summary>
+		/// Gets whether virtual space is enabled for this selection.
+		/// </summary>
+		public virtual bool EnableVirtualSpace {
+			get { return textArea.Options.EnableVirtualSpace; }
+		}
+		
+		/// <summary>
+		/// Gets the selection length.
+		/// </summary>
+		public abstract int Length { get; }
+		
+		/// <summary>
+		/// Returns a new selection with the changed end point.
+		/// </summary>
+		/// <exception cref="NotSupportedException">Cannot set endpoint for empty selection</exception>
+		public abstract Selection SetEndpoint(TextViewPosition endPosition);
+		
+		/// <summary>
+		/// If this selection is empty, starts a new selection from <paramref name="startPosition"/> to
+		/// <paramref name="endPosition"/>, otherwise, changes the endpoint of this selection.
+		/// </summary>
+		public abstract Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition);
+		
+		/// <summary>
+		/// Gets whether the selection is multi-line.
+		/// </summary>
+		public virtual bool IsMultiline {
+			get {
+				ISegment surroundingSegment = this.SurroundingSegment;
+				if (surroundingSegment == null)
+					return false;
+				int start = surroundingSegment.Offset;
+				int end = start + surroundingSegment.Length;
+				var document = textArea.Document;
+				if (document == null)
+					throw ThrowUtil.NoDocumentAssigned();
+				return document.GetLineByOffset(start) != document.GetLineByOffset(end);
+			}
+		}
+		
+		/// <summary>
+		/// Gets the selected text.
+		/// </summary>
+		public virtual string GetText()
+		{
+			var document = textArea.Document;
+			if (document == null)
+				throw ThrowUtil.NoDocumentAssigned();
+			StringBuilder b = null;
+			string text = null;
+			foreach (ISegment s in Segments) {
+				if (text != null) {
+					if (b == null)
+						b = new StringBuilder(text);
+					else
+						b.Append(text);
+				}
+				text = document.GetText(s);
+			}
+			if (b != null) {
+				if (text != null) b.Append(text);
+				return b.ToString();
+			} else {
+				return text ?? string.Empty;
+			}
+		}
+		
+		/// <summary>
+		/// Creates a HTML fragment for the selected text.
+		/// </summary>
+		public string CreateHtmlFragment(HtmlOptions options)
+		{
+			if (options == null)
+				throw new ArgumentNullException("options");
+			IHighlighter highlighter = textArea.GetService(typeof(IHighlighter)) as IHighlighter;
+			StringBuilder html = new StringBuilder();
+			bool first = true;
+			foreach (ISegment selectedSegment in this.Segments) {
+				if (first)
+					first = false;
+				else
+					html.AppendLine("<br>");
+				html.Append(HtmlClipboard.CreateHtmlFragment(textArea.Document, highlighter, selectedSegment, options));
+			}
+			return html.ToString();
+		}
+		
+		/// <inheritdoc/>
+		public abstract override bool Equals(object obj);
+		
+		/// <inheritdoc/>
+		public abstract override int GetHashCode();
+		
+		/// <summary>
+		/// Gets whether the specified offset is included in the selection.
+		/// </summary>
+		/// <returns>True, if the selection contains the offset (selection borders inclusive);
+		/// otherwise, false.</returns>
+		public virtual bool Contains(int offset)
+		{
+			if (this.IsEmpty)
+				return false;
+			if (this.SurroundingSegment.Contains(offset)) {
+				foreach (ISegment s in this.Segments) {
+					if (s.Contains(offset)) {
+						return true;
+					}
+				}
+			}
+			return false;
+		}
+		
+		/// <summary>
+		/// Creates a data object containing the selection's text.
+		/// </summary>
+		public virtual DataObject CreateDataObject(TextArea textArea)
+		{
+			string text = GetText();
+			// Ensure we use the appropriate newline sequence for the OS
+			DataObject data = new DataObject(TextUtilities.NormalizeNewLines(text, Environment.NewLine));
+			// we cannot use DataObject.SetText - then we cannot drag to SciTe
+			// (but dragging to Word works in both cases)
+			
+			// Also copy text in HTML format to clipboard - good for pasting text into Word
+			// or to the SharpDevelop forums.
+			HtmlClipboard.SetHtml(data, CreateHtmlFragment(new HtmlOptions(textArea.Options)));
+			return data;
+		}
+	}
+}