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Using AvalonEdit (WPF Text Editor)

, 1 Apr 2013
AvalonEdit is an extensible Open-Source text editor with support for syntax highlighting and folding.
AvalonEdit_4.3.1_Binaries-noexe.zip
AvalonEdit_4.3.1_Binaries.zip
AvalonEdit_4.3.1_Source-noexe.zip
AvalonEdit.Sample
AvalonEdit
dependencies.png
folding.png
renderingPipeline.png
screenshot.png
snoop.png
CustomHighlighting.xshd
Images
Copy.png
Cut.png
Delete.png
Open.png
Paste.png
Redo.png
Save.png
Undo.png
WordWrap.png
Properties
RenderingPipeline.pptx
Documentation
Architecture.aml
Code Completion.aml
Coordinate Systems.aml
Folding.aml
ICSharpCode.AvalonEdit.content
ICSharpCode.AvalonEdit.shfbproj
Media
NamespaceDependencies.png
RenderingPipeline.png
VisualTree.png
WelcomeScreenshot.png
Sample Application.aml
Syntax Highlighting.aml
Text Rendering.aml
Welcome.aml
ICSharpCode.AvalonEdit.Tests
Document
Editing
Highlighting
ICSharpCode.AvalonEdit.Tests.PartCover.Settings
Properties
Search
Utils
ICSharpCode.AvalonEdit
CodeCompletion
Document
Editing
Folding
Highlighting
Resources
ASPX.xshd
Boo.xshd
Coco-Mode.xshd
CPP-Mode.xshd
CSharp-Mode.xshd
CSS-Mode.xshd
HTML-Mode.xshd
Java-Mode.xshd
JavaScript-Mode.xshd
MarkDown-Mode.xshd
Patch-Mode.xshd
PHP-Mode.xshd
PowerShell.xshd
Tex-Mode.xshd
VBNET-Mode.xshd
XML-Mode.xshd
XmlDoc.xshd
Xshd
ICSharpCode.AvalonEdit.snk
Indentation
CSharp
Properties
Rendering
Search
next.png
prev.png
Snippets
themes
RightArrow.cur
Utils
Xml
AvalonEdit_4.3.1_Source.zip
dependencies.png
folding.png
renderingPipeline.png
screenshot.png
snoop.png
CustomHighlighting.xshd
Copy.png
Cut.png
Delete.png
Open.png
Paste.png
Redo.png
Save.png
Undo.png
WordWrap.png
RenderingPipeline.pptx
Architecture.aml
Code Completion.aml
Coordinate Systems.aml
Folding.aml
ICSharpCode.AvalonEdit.content
ICSharpCode.AvalonEdit.shfbproj
NamespaceDependencies.png
RenderingPipeline.png
VisualTree.png
WelcomeScreenshot.png
Sample Application.aml
Syntax Highlighting.aml
Text Rendering.aml
Welcome.aml
ICSharpCode.AvalonEdit.Tests.PartCover.Settings
nunit.framework.dll
ASPX.xshd
Boo.xshd
Coco-Mode.xshd
CPP-Mode.xshd
CSharp-Mode.xshd
CSS-Mode.xshd
HTML-Mode.xshd
Java-Mode.xshd
JavaScript-Mode.xshd
MarkDown-Mode.xshd
Patch-Mode.xshd
PHP-Mode.xshd
PowerShell.xshd
Tex-Mode.xshd
VBNET-Mode.xshd
XML-Mode.xshd
XmlDoc.xshd
ICSharpCode.AvalonEdit.snk
next.png
prev.png
RightArrow.cur
AvalonEdit_Binaries-noexe.zip
AvalonEdit_Binaries.zip
AvalonEdit_CHM_Documentation.zip
AvalonEdit_Source.zip
dependencies.png
folding.png
renderingPipeline.png
screenshot.png
snoop.png
CustomHighlighting.xshd
Copy.png
Cut.png
Delete.png
Open.png
Paste.png
Redo.png
Save.png
Undo.png
WordWrap.png
RenderingPipeline.pptx
Architecture.aml
Code Completion.aml
Coordinate Systems.aml
Folding.aml
Help
ICSharpCode.AvalonEdit.content
ICSharpCode.AvalonEdit.shfbproj
NamespaceDependencies.png
RenderingPipeline.png
VisualTree.png
WelcomeScreenshot.png
Sample Application.aml
Syntax Highlighting.aml
Text Rendering.aml
Welcome.aml
ICSharpCode.AvalonEdit.Tests.PartCover.Settings
nunit.framework.dll
ASPX.xshd
Boo.xshd
Coco-Mode.xshd
CPP-Mode.xshd
CSharp-Mode.xshd
CSS-Mode.xshd
HTML-Mode.xshd
Java-Mode.xshd
JavaScript-Mode.xshd
Patch-Mode.xshd
PHP-Mode.xshd
PowerShell.xshd
Tex-Mode.xshd
VBNET-Mode.xshd
XML-Mode.xshd
XmlDoc.xshd
ICSharpCode.AvalonEdit.snk
next.png
prev.png
RightArrow.cur
// 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.Globalization;
using System.IO;
using System.Text;

using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Utils;

namespace ICSharpCode.AvalonEdit.Highlighting
{
	/// <summary>
	/// Represents a highlighted document line.
	/// </summary>
	public class HighlightedLine
	{
		/// <summary>
		/// Creates a new HighlightedLine instance.
		/// </summary>
		public HighlightedLine(TextDocument document, DocumentLine documentLine)
		{
			if (document == null)
				throw new ArgumentNullException("document");
			if (!document.Lines.Contains(documentLine))
				throw new ArgumentException("Line is null or not part of document");
			this.Document = document;
			this.DocumentLine = documentLine;
			this.Sections = new NullSafeCollection<HighlightedSection>();
		}
		
		/// <summary>
		/// Gets the document associated with this HighlightedLine.
		/// </summary>
		public TextDocument Document { get; private set; }
		
		/// <summary>
		/// Gets the document line associated with this HighlightedLine.
		/// </summary>
		public DocumentLine DocumentLine { get; private set; }
		
		/// <summary>
		/// Gets the highlighted sections.
		/// The sections are not overlapping, but they may be nested.
		/// In that case, outer sections come in the list before inner sections.
		/// The sections are sorted by start offset.
		/// </summary>
		public IList<HighlightedSection> Sections { get; private set; }
		
		/// <summary>
		/// Gets the default color of all text outside a <see cref="HighlightedSection"/>.
		/// </summary>
		public HighlightingColor DefaultTextColor { get; set; }
		
		sealed class HtmlElement : IComparable<HtmlElement>
		{
			internal readonly int Offset;
			internal readonly int Nesting;
			internal readonly bool IsEnd;
			internal readonly HighlightingColor Color;
			
			public HtmlElement(int offset, int nesting, bool isEnd, HighlightingColor color)
			{
				this.Offset = offset;
				this.Nesting = nesting;
				this.IsEnd = isEnd;
				this.Color = color;
			}
			
			public int CompareTo(HtmlElement other)
			{
				int r = Offset.CompareTo(other.Offset);
				if (r != 0)
					return r;
				if (IsEnd != other.IsEnd) {
					if (IsEnd)
						return -1;
					else
						return 1;
				} else {
					if (IsEnd)
						return other.Nesting.CompareTo(Nesting);
					else
						return Nesting.CompareTo(other.Nesting);
				}
			}
		}
		
		/// <summary>
		/// Produces HTML code for the line, with &lt;span class="colorName"&gt; tags.
		/// </summary>
		public string ToHtml(HtmlOptions options)
		{
			int startOffset = this.DocumentLine.Offset;
			return ToHtml(startOffset, startOffset + this.DocumentLine.Length, options);
		}
		
		/// <summary>
		/// Produces HTML code for a section of the line, with &lt;span class="colorName"&gt; tags.
		/// </summary>
		public string ToHtml(int startOffset, int endOffset, HtmlOptions options)
		{
			if (options == null)
				throw new ArgumentNullException("options");
			int documentLineStartOffset = this.DocumentLine.Offset;
			int documentLineEndOffset = documentLineStartOffset + this.DocumentLine.Length;
			if (startOffset < documentLineStartOffset || startOffset > documentLineEndOffset)
				throw new ArgumentOutOfRangeException("startOffset", startOffset, "Value must be between " + documentLineStartOffset + " and " + documentLineEndOffset);
			if (endOffset < startOffset || endOffset > documentLineEndOffset)
				throw new ArgumentOutOfRangeException("endOffset", endOffset, "Value must be between startOffset and " + documentLineEndOffset);
			ISegment requestedSegment = new SimpleSegment(startOffset, endOffset - startOffset);
			
			List<HtmlElement> elements = new List<HtmlElement>();
			for (int i = 0; i < this.Sections.Count; i++) {
				HighlightedSection s = this.Sections[i];
				if (s.GetOverlap(requestedSegment).Length > 0) {
					elements.Add(new HtmlElement(s.Offset, i, false, s.Color));
					elements.Add(new HtmlElement(s.Offset + s.Length, i, true, s.Color));
				}
			}
			elements.Sort();
			
			TextDocument document = this.Document;
			StringWriter w = new StringWriter(CultureInfo.InvariantCulture);
			int textOffset = startOffset;
			foreach (HtmlElement e in elements) {
				int newOffset = Math.Min(e.Offset, endOffset);
				if (newOffset > startOffset) {
					HtmlClipboard.EscapeHtml(w, document.GetText(textOffset, newOffset - textOffset), options);
				}
				textOffset = Math.Max(textOffset, newOffset);
				if (options.ColorNeedsSpanForStyling(e.Color)) {
					if (e.IsEnd) {
						w.Write("</span>");
					} else {
						w.Write("<span");
						options.WriteStyleAttributeForColor(w, e.Color);
						w.Write('>');
					}
				}
			}
			HtmlClipboard.EscapeHtml(w, document.GetText(textOffset, endOffset - textOffset), options);
			return w.ToString();
		}
		
		/// <inheritdoc/>
		public override string ToString()
		{
			return "[" + GetType().Name + " " + ToHtml(new HtmlOptions()) + "]";
		}
	}
}

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Daniel Grunwald

Germany Germany
I am the lead developer on the SharpDevelop open source project.
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