private void HighlightCodeSnippet(SyntaxHighlighterProcessor syntaxProcessor, HtmlAgilityPack.HtmlNode codeBlock)
{
// The parent node of a codeblock is a PRE element. Find if there is a Comment above the PRE tag to parse.
HtmlAgilityPack.HtmlNode previousElement;
int[] linesToMark;
int[] linesToStrikethrough;
lock (syncRoot)
{
previousElement = this.parser.FindPreviousElement(codeBlock.ParentNode);
if (previousElement != null && previousElement.Name == "span")
{
previousElement = this.parser.FindPreviousElement(previousElement, HtmlAgilityPack.HtmlNodeType.Comment);
}
}
if (previousElement == null || previousElement.NodeType != HtmlAgilityPack.HtmlNodeType.Comment)
{
linesToMark = new int[] { };
linesToStrikethrough = new int[] { };
}
else
{
linesToMark = this.GetLinesFromCommand(previousElement, "mark");
linesToStrikethrough = this.GetLinesFromCommand(previousElement, "strike");
}
if (!codeBlock.Attributes.Contains("class"))
{
return;
}
var language = codeBlock.Attributes["class"].Value;
var codeSnippetText = codeBlock.InnerHtml;
var highlightedSnippet = syntaxProcessor.Highlight(codeSnippetText, language, linesToMark, linesToStrikethrough);
// intentional: The Dictionary behind the InnerHtml manipulation in the HtmlDocument class is not thread safe
lock (innerHtmlSyncRoot)
{
codeBlock.InnerHtml = highlightedSnippet;
}
}
public string Highlight()
{
try
{
var codeSnippetBlocks = this.parser.GetElements("code");
if (codeSnippetBlocks == null)
{
return(this.originalText);
}
Parallel.ForEach(
codeSnippetBlocks,
codeBlock =>
{
var originalOuterHtml = codeBlock.OuterHtml;
try
{
var syntaxProcessor = new SyntaxHighlighterProcessor();
this.HighlightCodeSnippet(syntaxProcessor, codeBlock);
}
catch (Exception ex)
{
var message = string.Format(
CultureInfo.CurrentCulture,
"There was an error highlighting code!{2}Code Block OuterHtml: '{0}'{2}Original OuterHtml: '{1}'{2}",
codeBlock.OuterHtml,
originalOuterHtml,
Environment.NewLine);
throw new InvalidOperationException(message, ex);
}
});
}
catch (Exception ex)
{
throw new Exception("Error while trying to highlight a block of code", ex);
}
return(this.parser.Html);
}
public string Highlight()
{
try
{
var codeSnippetBlocks = this.parser.GetElements("code");
if (codeSnippetBlocks == null)
{
return this.originalText;
}
int currentCount = 1;
int total = codeSnippetBlocks.Count();
Parallel.ForEach(
codeSnippetBlocks,
codeBlock =>
{
var originalOuterHtml = codeBlock.OuterHtml;
try
{
// Notifying progress
ProgressNotificationHelper.ReportProgress(currentCount / total, "Processing Code Snippets");
currentCount++;
var syntaxProcessor = new SyntaxHighlighterProcessor();
this.HighlightCodeSnippet(syntaxProcessor, codeBlock);
}
catch (Exception ex)
{
var message = string.Format(
CultureInfo.CurrentCulture,
"There was an error highlighting code!{2}Code Block OuterHtml: '{0}'{2}Original OuterHtml: '{1}'{2}",
codeBlock.OuterHtml,
originalOuterHtml,
Environment.NewLine);
throw new InvalidOperationException(message, ex);
}
});
}
catch (Exception ex)
{
throw new Exception("Error while trying to highlight a block of code", ex);
}
return this.parser.Html;
}
private void HighlightCodeSnippet(SyntaxHighlighterProcessor syntaxProcessor, HtmlAgilityPack.HtmlNode codeBlock)
{
// The parent node of a codeblock is a PRE element. Find if there is a Comment above the PRE tag to parse.
HtmlAgilityPack.HtmlNode previousElement = null;
int[] linesToMark;
int[] linesToStrikethrough;
lock (syncRoot)
{
previousElement = this.parser.FindPreviousElement(codeBlock.ParentNode);
if (previousElement != null && previousElement.Name == "span")
{
previousElement = this.parser.FindPreviousElement(previousElement, HtmlAgilityPack.HtmlNodeType.Comment);
}
}
if (previousElement == null || previousElement.NodeType != HtmlAgilityPack.HtmlNodeType.Comment)
{
linesToMark = new int[] { };
linesToStrikethrough = new int[] { };
}
else
{
linesToMark = this.GetLinesFromCommand(previousElement, "mark");
linesToStrikethrough = this.GetLinesFromCommand(previousElement, "strike");
}
if (!codeBlock.Attributes.Contains("class"))
{
return;
}
var language = codeBlock.Attributes["class"].Value;
var codeSnippetText = codeBlock.InnerHtml;
var highlightedSnippet = syntaxProcessor.Highlight(codeSnippetText, language, linesToMark, linesToStrikethrough);
// intentional: The Dictionary behind the InnerHtml manipulation in the HtmlDocument class is not thread safe
lock (innerHtmlSyncRoot)
{
codeBlock.InnerHtml = highlightedSnippet;
}
}
