miscactions.cs

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// <file>
//     <copyright see="prj:///doc/copyright.txt"/>
//     <license see="prj:///doc/license.txt"/>
//     <owner name="Mike Krüger" email="[e-mail]"/>
//     <version>$Revision: 915 $</version>
// </file>

using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using ICSharpCode.TextEditor.Document;

namespace ICSharpCode.TextEditor.Actions
{
	public class Tab : AbstractEditAction
	{
		public static string GetIndentationString(IDocument document)
		{
			return GetIndentationString(document, null);
		}
		
		public static string GetIndentationString(IDocument document, TextArea textArea)
		{
			StringBuilder indent = new StringBuilder();
			
			if (document.TextEditorProperties.ConvertTabsToSpaces) {
				int tabIndent = document.TextEditorProperties.TabIndent;
				if (textArea != null) {
					int column = textArea.TextView.GetVisualColumn(textArea.Caret.Line, textArea.Caret.Column);
					indent.Append(new String(' ', tabIndent - column % tabIndent));
				} else {
					indent.Append(new String(' ', tabIndent));
				}
			} else {
				indent.Append('\t');
			}
			return indent.ToString();
		}
		
		void InsertTabs(IDocument document, ISelection selection, int y1, int y2)
		{
			int    redocounter = 0;
			string indentationString = GetIndentationString(document);
			for (int i = y2; i >= y1; --i) {
				LineSegment line = document.GetLineSegment(i);
				if (i == y2 && i == selection.EndPosition.Y && selection.EndPosition.X  == 0) {
					continue;
				}
				
				// this bit is optional - but useful if you are using block tabbing to sort out
				// a source file with a mixture of tabs and spaces
//				string newLine = document.GetText(line.Offset,line.Length);
//				document.Replace(line.Offset,line.Length,newLine);
//				++redocounter;
				
				document.Insert(line.Offset, indentationString);
				++redocounter;
			}
			
			if (redocounter > 0) {
				document.UndoStack.UndoLast(redocounter); // redo the whole operation (not the single deletes)
			}
		}
		
		void InsertTabAtCaretPosition(TextArea textArea)
		{
			switch (textArea.Caret.CaretMode) {
				case CaretMode.InsertMode:
					textArea.InsertString(GetIndentationString(textArea.Document, textArea));
					break;
				case CaretMode.OverwriteMode:
					string indentStr = GetIndentationString(textArea.Document, textArea);
					textArea.ReplaceChar(indentStr[0]);
					if (indentStr.Length > 1) {
						textArea.InsertString(indentStr.Substring(1));
					}
					break;
			}
			textArea.SetDesiredColumn();
		}
		/// <remarks>
		/// Executes this edit action
		/// </remarks>
		/// <param name="textArea">The <see cref="ItextArea"/> which is used for callback purposes</param>
		public override void Execute(TextArea textArea)
		{
			if (textArea.Document.ReadOnly) {
				return;
			}
			if (textArea.SelectionManager.HasSomethingSelected) {
				foreach (ISelection selection in textArea.SelectionManager.SelectionCollection) {
					int startLine = selection.StartPosition.Y;
					int endLine   = selection.EndPosition.Y;
					if (startLine != endLine) {
						textArea.BeginUpdate();
						InsertTabs(textArea.Document, selection, startLine, endLine);
						textArea.Document.UpdateQueue.Clear();
						textArea.Document.RequestUpdate(new TextAreaUpdate(TextAreaUpdateType.LinesBetween, startLine, endLine));
						textArea.EndUpdate();
					} else {
						InsertTabAtCaretPosition(textArea);
						break;
					}
				}
				textArea.Document.CommitUpdate();
				textArea.AutoClearSelection = false;
			} else {
				InsertTabAtCaretPosition(textArea);
			}
		}
	}
	
	public class ShiftTab : AbstractEditAction
	{
		void RemoveTabs(IDocument document, ISelection selection, int y1, int y2)
		{
			int  redocounter = 0;
			for (int i = y2; i >= y1; --i) {
				LineSegment line = document.GetLineSegment(i);
				if (i == y2 && line.Offset == selection.EndOffset) {
					continue;
				}
				if (line.Length > 0) {
					/**** TextPad Strategy:
					/// first convert leading whitespace to tabs (controversial! - not all editors work like this)
					string newLine = TextUtilities.LeadingWhiteSpaceToTabs(document.GetText(line.Offset,line.Length),document.Properties.Get("TabIndent", 4));
					if(newLine.Length > 0 && newLine[0] == '\t') {
						document.Replace(line.Offset,line.Length,newLine.Substring(1));
						++redocounter;
					}
					else if(newLine.Length > 0 && newLine[0] == ' ') {
						/// there were just some leading spaces but less than TabIndent of them
						int leadingSpaces = 1;
						for(leadingSpaces = 1; leadingSpaces < newLine.Length && newLine[leadingSpaces] == ' '; leadingSpaces++) {
							/// deliberately empty
						}
						document.Replace(line.Offset,line.Length,newLine.Substring(leadingSpaces));
						++redocounter;
					}
					/// else
					/// there were no leading tabs or spaces on this line so do nothing
					/// MS Visual Studio 6 strategy:
					 ****/
//					string temp = document.GetText(line.Offset,line.Length);
					if (line.Length > 0) {
						int charactersToRemove = 0;
						if(document.GetCharAt(line.Offset) == '\t') { // first character is a tab - just remove it
							charactersToRemove = 1;
						} else if(document.GetCharAt(line.Offset) == ' ') {
							int leadingSpaces = 1;
							int tabIndent = document.TextEditorProperties.TabIndent;
							for (leadingSpaces = 1; leadingSpaces < line.Length && document.GetCharAt(line.Offset + leadingSpaces) == ' '; leadingSpaces++) {
								// deliberately empty
							}
							if(leadingSpaces >= tabIndent) {
								// just remove tabIndent
								charactersToRemove = tabIndent;
							}
							else if(line.Length > leadingSpaces && document.GetCharAt(line.Offset + leadingSpaces) == '\t') {
								// remove the leading spaces and the following tab as they add up
								// to just one tab stop
								charactersToRemove = leadingSpaces+1;
							}
							else {
								// just remove the leading spaces
								charactersToRemove = leadingSpaces;
							}
						}
						if (charactersToRemove > 0) {
							document.Remove(line.Offset,charactersToRemove);
							++redocounter;
						}
					}
				}
			}
			
			if (redocounter > 0) {
				document.UndoStack.UndoLast(redocounter); // redo the whole operation (not the single deletes)
			}
		}
		
		/// <remarks>
		/// Executes this edit action
		/// </remarks>
		/// <param name="textArea">The <see cref="ItextArea"/> which is used for callback purposes</param>
		public override void Execute(TextArea textArea)
		{
			if (textArea.SelectionManager.HasSomethingSelected) {
				foreach (ISelection selection in textArea.SelectionManager.SelectionCollection) {
					int startLine = selection.StartPosition.Y;
					int endLine   = selection.EndPosition.Y;
					textArea.BeginUpdate();
					RemoveTabs(textArea.Document, selection, startLine, endLine);
					textArea.Document.UpdateQueue.Clear();
					textArea.Document.RequestUpdate(new TextAreaUpdate(TextAreaUpdateType.LinesBetween, startLine, endLine));
					textArea.EndUpdate();
					
				}
				textArea.AutoClearSelection = false;
			} else {
				// Pressing Shift-Tab with nothing selected the cursor will move back to the
				// previous tab stop. It will stop at the beginning of the line. Also, the desired
				// column is updated to that column.
				LineSegment line = textArea.Document.GetLineSegmentForOffset(textArea.Caret.Offset);
				string startOfLine = textArea.Document.GetText(line.Offset,textArea.Caret.Offset - line.Offset);
				int tabIndent = textArea.Document.TextEditorProperties.TabIndent;
				int currentColumn = textArea.Caret.Column;
				int remainder = currentColumn % tabIndent;
				if (remainder == 0) {
					textArea.Caret.DesiredColumn = Math.Max(0, currentColumn - tabIndent);
				} else {
					textArea.Caret.DesiredColumn = Math.Max(0, currentColumn - remainder);
				}
				textArea.SetCaretToDesiredColumn(textArea.Caret.Line);
			}
		}
	}
	
	public class ToggleComment : AbstractEditAction
	{
		/// <remarks>
		/// Executes this edit action
		/// </remarks>
		/// <param name="textArea">The <see cref="ItextArea"/> which is used for callback purposes</param>
		public override void Execute(TextArea textArea)
		{
			if (textArea.Document.ReadOnly) {
				return;
			}
			
			if (textArea.Document.HighlightingStrategy.Properties.ContainsKey("LineComment")) {
				new ToggleLineComment().Execute(textArea);
			} else if (textArea.Document.HighlightingStrategy.Properties.ContainsKey("BlockCommentBegin") &&
			           textArea.Document.HighlightingStrategy.Properties.ContainsKey("BlockCommentBegin")) {
				new ToggleBlockComment().Execute(textArea);
			}
		}
	}
	
	public class ToggleLineComment : AbstractEditAction
	{
		int firstLine;
		int lastLine;
		
		void RemoveCommentAt(IDocument document, string comment, ISelection selection, int y1, int y2)
		{
			int  redocounter = 0;
			firstLine = y1;
			lastLine  = y2;
			
			for (int i = y2; i >= y1; --i) {
				LineSegment line = document.GetLineSegment(i);
				if (selection != null && i == y2 && line.Offset == selection.Offset + selection.Length) {
					--lastLine;
					continue;
				}
				
				string lineText = document.GetText(line.Offset, line.Length);
				if (lineText.Trim().StartsWith(comment)) {
					document.Remove(line.Offset + lineText.IndexOf(comment), comment.Length);
					++redocounter;
				}
			}
			
			if (redocounter > 0) {
				document.UndoStack.UndoLast(redocounter); // redo the whole operation (not the single deletes)
			}
		}
		
		void SetCommentAt(IDocument document, string comment, ISelection selection, int y1, int y2)
		{
			int  redocounter = 0;
			firstLine = y1;
			lastLine  = y2;
			
			for (int i = y2; i >= y1; --i) {
				LineSegment line = document.GetLineSegment(i);
				if (selection != null && i == y2 && line.Offset == selection.Offset + selection.Length) {
					--lastLine;
					continue;
				}
				
				string lineText = document.GetText(line.Offset, line.Length);
				document.Insert(line.Offset, comment);
				++redocounter;
			}
			
			if (redocounter > 0) {
				document.UndoStack.UndoLast(redocounter); // redo the whole operation (not the single deletes)
			}
		}
		
		bool ShouldComment(IDocument document, string comment, ISelection selection, int startLine, int endLine)
		{
			for (int i = endLine; i >= startLine; --i) {
				LineSegment line = document.GetLineSegment(i);
				if (selection != null && i == endLine && line.Offset == selection.Offset + selection.Length) {
					--lastLine;
					continue;
				}
				string lineText = document.GetText(line.Offset, line.Length);
				if (!lineText.Trim().StartsWith(comment)) {
					return true;
				}
			}
			return false;
		}