1 files changed, 179 insertions, 0 deletions
diff --git a/main/src/core/Mono.Texteditor/Mono.TextEditor/Document/ImmutableLineSplitter.cs b/main/src/core/Mono.Texteditor/Mono.TextEditor/Document/ImmutableLineSplitter.cs
new file mode 100644
index 0000000000..a2d65da072
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+++ b/main/src/core/Mono.Texteditor/Mono.TextEditor/Document/ImmutableLineSplitter.cs
@@ -0,0 +1,179 @@
+//
+// ImmutableLineSplitter.cs
+//
+// Author:
+//       Mike Krüger <mkrueger@xamarin.com>
+//
+// Copyright (c) 2014 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 System.Linq;
+using ICSharpCode.NRefactory;
+using System.Collections.Generic;
+
+namespace Mono.TextEditor
+{
+	class ImmutableLineSplitter : ILineSplitter
+	{
+		readonly LineSegment[] lines;
+
+		sealed class LineSegment : DocumentLine
+		{
+			readonly ImmutableLineSplitter splitter;
+			readonly int lineNumber;
+
+			public override int Offset { get; set; }
+
+			public override int LineNumber {
+				get {
+					return lineNumber + 1;
+				}
+			}
+
+			public override DocumentLine NextLine {
+				get {
+					return splitter.Get (lineNumber + 1);
+				}
+			}
+
+			public override DocumentLine PreviousLine {
+				get {
+					return splitter.Get (lineNumber - 1);
+				}
+			}
+
+			public LineSegment (ImmutableLineSplitter splitter, int lineNumber, int offset, int length, UnicodeNewline newLine) : base(length, newLine)
+			{
+				this.splitter = splitter;
+				this.lineNumber = lineNumber;
+				Offset = offset;
+			}
+		}
+
+		public ImmutableLineSplitter (ILineSplitter src)
+		{
+			if (src == null)
+				throw new ArgumentNullException ("src");
+			lines = new LineSegment[src.Count];
+			int cur = 0;
+			foreach (var line in src.Lines) {
+				lines [cur] = new LineSegment (this, cur, line.Offset, line.LengthIncludingDelimiter, line.UnicodeNewline);
+				cur++;
+			}
+		}
+
+		#region ILineSplitter implementation
+
+		public event EventHandler<LineEventArgs> LineChanged;
+
+		public event EventHandler<LineEventArgs> LineInserted;
+
+		public event EventHandler<LineEventArgs> LineRemoved;
+
+		public void Clear ()
+		{
+		}
+
+		public void Initalize (string text, out DocumentLine longestLine)
+		{
+			longestLine = null;
+		}
+
+		public DocumentLine Get (int number)
+		{
+			return lines [number - 1];
+		}
+
+		public DocumentLine GetLineByOffset (int offset)
+		{
+			return lines [OffsetToLineNumber (offset) - 1];
+		}
+
+		public int OffsetToLineNumber (int offset)
+		{
+			int min = 0;
+			int max = lines.Length - 1;
+			while (min <= max) {
+				int mid = (min + max) / 2;
+				var middleLine = lines [mid];
+				if (offset < middleLine.Offset) {
+					max = mid - 1;
+				} else if (offset > middleLine.EndOffset) {
+					min = mid + 1;
+				} else {
+					return mid + 1;
+				}
+			}
+			return lines.Length;
+		}
+
+		public void TextReplaced (object sender, DocumentChangeEventArgs args)
+		{
+		}
+
+		public void TextRemove (int offset, int length)
+		{
+		}
+
+		public void TextInsert (int offset, string text)
+		{
+		}
+
+		public IEnumerable<DocumentLine> GetLinesBetween (int startLine, int endLine)
+		{
+			for (int i = startLine; i <= endLine; i++)
+				yield return Get (i);
+		}
+
+		public IEnumerable<DocumentLine> GetLinesStartingAt (int startLine)
+		{
+			for (int i = startLine; i <= Count; i++)
+				yield return Get (i);
+		}
+
+		public IEnumerable<DocumentLine> GetLinesReverseStartingAt (int startLine)
+		{
+			for (int i = startLine; i-- > DocumentLocation.MinLine;)
+				yield return Get (i);
+		}
+
+		public int Count {
+			get {
+				return lines.Length;
+			}
+		}
+
+		public bool LineEndingMismatch {
+			get;
+			set;
+		}
+
+		public System.Collections.Generic.IEnumerable<DocumentLine> Lines {
+			get {
+				return lines;
+			}
+		}
+
+		#endregion
+
+
+	}
+}
+