202 lines
6.6 KiB
C#
202 lines
6.6 KiB
C#
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using System.Diagnostics;
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using System.Globalization;
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using System.IO;
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using System.Text;
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using System.Windows;
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using ICSharpCode.AvalonEdit.Document;
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namespace ICSharpCode.AvalonEdit.Highlighting
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{
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/// <summary>
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/// Allows copying HTML text to the clipboard.
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/// </summary>
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public static class HtmlClipboard
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{
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/// <summary>
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/// Builds a header for the CF_HTML clipboard format.
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/// </summary>
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static string BuildHeader(int startHTML, int endHTML, int startFragment, int endFragment)
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{
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StringBuilder b = new StringBuilder();
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b.AppendLine("Version:0.9");
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b.AppendLine("StartHTML:" + startHTML.ToString("d8", CultureInfo.InvariantCulture));
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b.AppendLine("EndHTML:" + endHTML.ToString("d8", CultureInfo.InvariantCulture));
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b.AppendLine("StartFragment:" + startFragment.ToString("d8", CultureInfo.InvariantCulture));
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b.AppendLine("EndFragment:" + endFragment.ToString("d8", CultureInfo.InvariantCulture));
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return b.ToString();
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}
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/// <summary>
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/// Sets the TextDataFormat.Html on the data object to the specified html fragment.
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/// This helper methods takes care of creating the necessary CF_HTML header.
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/// </summary>
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public static void SetHtml(DataObject dataObject, string htmlFragment)
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{
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if (dataObject == null)
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throw new ArgumentNullException("dataObject");
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if (htmlFragment == null)
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throw new ArgumentNullException("htmlFragment");
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string htmlStart = @"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">" + Environment.NewLine
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+ "<HTML>" + Environment.NewLine
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+ "<BODY>" + Environment.NewLine
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+ "<!--StartFragment-->" + Environment.NewLine;
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string htmlEnd = "<!--EndFragment-->" + Environment.NewLine + "</BODY>" + Environment.NewLine + "</HTML>" + Environment.NewLine;
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string dummyHeader = BuildHeader(0, 0, 0, 0);
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// the offsets are stored as UTF-8 bytes (see CF_HTML documentation)
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int startHTML = dummyHeader.Length;
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int startFragment = startHTML + htmlStart.Length;
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int endFragment = startFragment + Encoding.UTF8.GetByteCount(htmlFragment);
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int endHTML = endFragment + htmlEnd.Length;
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string cf_html = BuildHeader(startHTML, endHTML, startFragment, endFragment) + htmlStart + htmlFragment + htmlEnd;
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Debug.WriteLine(cf_html);
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dataObject.SetText(cf_html, TextDataFormat.Html);
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}
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/// <summary>
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/// Creates a HTML fragment from a part of a document.
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/// </summary>
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/// <param name="document">The document to create HTML from.</param>
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/// <param name="highlighter">The highlighter used to highlight the document. <c>null</c> is valid and will create HTML without any highlighting.</param>
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/// <param name="segment">The part of the document to create HTML for. You can pass <c>null</c> to create HTML for the whole document.</param>
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/// <param name="options">The options for the HTML creation.</param>
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/// <returns>HTML code for the document part.</returns>
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public static string CreateHtmlFragment(TextDocument document, IHighlighter highlighter, ISegment segment, HtmlOptions options)
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{
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if (document == null)
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throw new ArgumentNullException("document");
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if (options == null)
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throw new ArgumentNullException("options");
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if (highlighter != null && highlighter.Document != document)
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throw new ArgumentException("Highlighter does not belong to the specified document.");
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if (segment == null)
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segment = new SimpleSegment(0, document.TextLength);
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StringBuilder html = new StringBuilder();
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int segmentEndOffset = segment.EndOffset;
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DocumentLine line = document.GetLineByOffset(segment.Offset);
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while (line != null && line.Offset < segmentEndOffset) {
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HighlightedLine highlightedLine;
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if (highlighter != null)
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highlightedLine = highlighter.HighlightLine(line.LineNumber);
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else
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highlightedLine = new HighlightedLine(document, line);
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SimpleSegment s = segment.GetOverlap(line);
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if (html.Length > 0)
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html.AppendLine("<br>");
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html.Append(highlightedLine.ToHtml(s.Offset, s.EndOffset, options));
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line = line.NextLine;
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}
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return html.ToString();
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}
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/// <summary>
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/// Escapes text and writes the result to the StringBuilder.
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/// </summary>
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internal static void EscapeHtml(StringWriter w, string text, HtmlOptions options)
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{
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int spaceCount = -1;
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foreach (char c in text) {
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if (c == ' ') {
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if (spaceCount < 0)
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w.Write(" ");
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else
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spaceCount++;
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} else if (c == '\t') {
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if (spaceCount < 0)
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spaceCount = 0;
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spaceCount += options.TabSize;
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} else {
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if (spaceCount == 1) {
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w.Write(' ');
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} else if (spaceCount >= 1) {
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for (int i = 0; i < spaceCount; i++) {
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w.Write(" ");
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}
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}
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spaceCount = 0;
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switch (c) {
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case '<':
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w.Write("<");
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break;
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case '>':
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w.Write(">");
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break;
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case '&':
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w.Write("&");
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break;
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case '"':
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w.Write(""");
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break;
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default:
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w.Write(c);
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break;
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}
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}
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}
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for (int i = 0; i < spaceCount; i++) {
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w.Write(" ");
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}
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}
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}
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/// <summary>
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/// Holds options for converting text to HTML.
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/// </summary>
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public class HtmlOptions
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{
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/// <summary>
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/// Creates a default HtmlOptions instance.
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/// </summary>
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public HtmlOptions()
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{
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this.TabSize = 4;
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}
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/// <summary>
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/// Creates a new HtmlOptions instance that copies applicable options from the <see cref="TextEditorOptions"/>.
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/// </summary>
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public HtmlOptions(TextEditorOptions options)
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: this()
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{
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if (options == null)
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throw new ArgumentNullException("options");
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this.TabSize = options.IndentationSize;
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}
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/// <summary>
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/// The amount of spaces a tab gets converted to.
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/// </summary>
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public int TabSize { get; set; }
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/// <summary>
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/// Writes the HTML attribute for the style to the text writer.
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/// </summary>
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public virtual void WriteStyleAttributeForColor(TextWriter writer, HighlightingColor color)
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{
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if (writer == null)
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throw new ArgumentNullException("writer");
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if (color == null)
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throw new ArgumentNullException("color");
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writer.Write(" style=\"");
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writer.Write(color.ToCss());
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writer.Write("\"");
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}
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/// <summary>
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/// Gets whether the color needs to be written out to HTML.
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/// </summary>
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public virtual bool ColorNeedsSpanForStyling(HighlightingColor color)
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{
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if (color == null)
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throw new ArgumentNullException("color");
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return !string.IsNullOrEmpty(color.ToCss());
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}
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}
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}
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