MERGE

1 files changed, 134 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Document/NewLineFinder.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Document/NewLineFinder.cs
new file mode 100644
index 000000000..6ecf8c1e5
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Document/NewLineFinder.cs
@@ -0,0 +1,134 @@
+// 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.Diagnostics;
+using System.Text;
+
+namespace Tango.Scripting.Editors.Document
+{
+	static class NewLineFinder
+	{
+		static readonly char[] newline = { '\r', '\n' };
+		
+		internal static readonly string[] NewlineStrings = { "\r\n", "\r", "\n" };
+		
+		/// <summary>
+		/// Gets the location of the next new line character, or SimpleSegment.Invalid
+		/// if none is found.
+		/// </summary>
+		internal static SimpleSegment NextNewLine(string text, int offset)
+		{
+			int pos = text.IndexOfAny(newline, offset);
+			if (pos >= 0) {
+				if (text[pos] == '\r') {
+					if (pos + 1 < text.Length && text[pos + 1] == '\n')
+						return new SimpleSegment(pos, 2);
+				}
+				return new SimpleSegment(pos, 1);
+			}
+			return SimpleSegment.Invalid;
+		}
+		
+		/// <summary>
+		/// Gets the location of the next new line character, or SimpleSegment.Invalid
+		/// if none is found.
+		/// </summary>
+		internal static SimpleSegment NextNewLine(ITextSource text, int offset)
+		{
+			int textLength = text.TextLength;
+			int pos = text.IndexOfAny(newline, offset, textLength - offset);
+			if (pos >= 0) {
+				if (text.GetCharAt(pos) == '\r') {
+					if (pos + 1 < textLength && text.GetCharAt(pos + 1) == '\n')
+						return new SimpleSegment(pos, 2);
+				}
+				return new SimpleSegment(pos, 1);
+			}
+			return SimpleSegment.Invalid;
+		}
+	}
+	
+	partial class TextUtilities
+	{
+		/// <summary>
+		/// Finds the next new line character starting at offset.
+		/// </summary>
+		/// <param name="text">The text source to search in.</param>
+		/// <param name="offset">The starting offset for the search.</param>
+		/// <param name="newLineType">The string representing the new line that was found, or null if no new line was found.</param>
+		/// <returns>The position of the first new line starting at or after <paramref name="offset"/>,
+		/// or -1 if no new line was found.</returns>
+		public static int FindNextNewLine(ITextSource text, int offset, out string newLineType)
+		{
+			if (text == null)
+				throw new ArgumentNullException("text");
+			if (offset < 0 || offset > text.TextLength)
+				throw new ArgumentOutOfRangeException("offset", offset, "offset is outside of text source");
+			SimpleSegment s = NewLineFinder.NextNewLine(text, offset);
+			if (s == SimpleSegment.Invalid) {
+				newLineType = null;
+				return -1;
+			} else {
+				if (s.Length == 2) {
+					newLineType = "\r\n";
+				} else if (text.GetCharAt(s.Offset) == '\n') {
+					newLineType = "\n";
+				} else {
+					newLineType = "\r";
+				}
+				return s.Offset;
+			}
+		}
+		
+		/// <summary>
+		/// Gets whether the specified string is a newline sequence.
+		/// </summary>
+		public static bool IsNewLine(string newLine)
+		{
+			return newLine == "\r\n" || newLine == "\n" || newLine == "\r";
+		}
+		
+		/// <summary>
+		/// Normalizes all new lines in <paramref name="input"/> to be <paramref name="newLine"/>.
+		/// </summary>
+		public static string NormalizeNewLines(string input, string newLine)
+		{
+			if (input == null)
+				return null;
+			if (!IsNewLine(newLine))
+				throw new ArgumentException("newLine must be one of the known newline sequences");
+			SimpleSegment ds = NewLineFinder.NextNewLine(input, 0);
+			if (ds == SimpleSegment.Invalid) // text does not contain any new lines
+				return input;
+			StringBuilder b = new StringBuilder(input.Length);
+			int lastEndOffset = 0;
+			do {
+				b.Append(input, lastEndOffset, ds.Offset - lastEndOffset);
+				b.Append(newLine);
+				lastEndOffset = ds.EndOffset;
+				ds = NewLineFinder.NextNewLine(input, lastEndOffset);
+			} while (ds != SimpleSegment.Invalid);
+			// remaining string (after last newline)
+			b.Append(input, lastEndOffset, input.Length - lastEndOffset);
+			return b.ToString();
+		}
+		
+		/// <summary>
+		/// Gets the newline sequence used in the document at the specified line.
+		/// </summary>
+		public static string GetNewLineFromDocument(TextDocument document, int lineNumber)
+		{
+			DocumentLine line = document.GetLineByNumber(lineNumber);
+			if (line.DelimiterLength == 0) {
+				// at the end of the document, there's no line delimiter, so use the delimiter
+				// from the previous line
+				line = line.PreviousLine;
+				if (line == null)
+					return Environment.NewLine;
+			}
+			return document.GetText(line.Offset + line.Length, line.DelimiterLength);
+		}
+	}
+}