/// <summary>
/// Renders a strikethrough element.
/// </summary>
/// <param name="element"> The parsed inline element to render. </param>
/// <param name="context"> Persistent state. </param>
protected override void RenderStrikethroughRun(StrikethroughTextInline element, IRenderContext context)
{
var localContext = context as InlineRenderContext;
if (localContext == null)
{
throw new RenderContextIncorrectException();
}
Span span = new Span();
if (TextDecorationsSupported)
{
span.TextDecorations = TextDecorations.Strikethrough;
}
else
{
span.FontFamily = new FontFamily("Consolas");
}
var childContext = new InlineRenderContext(span.Inlines, context)
{
Parent = span
};
// Render the children into the inline.
RenderInlineChildren(element.Inlines, childContext);
if (!TextDecorationsSupported)
{
AlterChildRuns(span, (parentSpan, run) =>
{
var text = run.Text;
var builder = new StringBuilder(text.Length * 2);
foreach (var c in text)
{
builder.Append((char)0x0336);
builder.Append(c);
}
run.Text = builder.ToString();
});
}
// Add it to the current inlines
localContext.InlineCollection.Add(span);
}
/// <summary>
/// Attempts to parse a strikethrough text span.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location to start parsing. </param>
/// <param name="maxEnd"> The location to stop parsing. </param>
/// <returns> A parsed strikethrough text span, or <c>null</c> if this is not a strikethrough text span. </returns>
internal static InlineParseResult Parse(string markdown, int start, int maxEnd)
{
// Check the start sequence.
if (start >= maxEnd - 1 || markdown.Substring(start, 2) != "~~")
{
return(null);
}
// Find the end of the span.
var innerStart = start + 2;
int innerEnd = Common.IndexOf(markdown, "~~", innerStart, maxEnd);
if (innerEnd == -1)
{
return(null);
}
// The span must contain at least one character.
if (innerStart == innerEnd)
{
return(null);
}
// The first character inside the span must NOT be a space.
if (ParseHelpers.IsMarkdownWhiteSpace(markdown[innerStart]))
{
return(null);
}
// The last character inside the span must NOT be a space.
if (ParseHelpers.IsMarkdownWhiteSpace(markdown[innerEnd - 1]))
{
return(null);
}
// We found something!
var result = new StrikethroughTextInline
{
Inlines = Common.ParseInlineChildren(markdown, innerStart, innerEnd)
};
return(new InlineParseResult(result, start, innerEnd + 2));
}
static Common()
{
BoldItalicTextInline.AddTripChars(_triggerList);
BoldTextInline.AddTripChars(_triggerList);
ItalicTextInline.AddTripChars(_triggerList);
MarkdownLinkInline.AddTripChars(_triggerList);
HyperlinkInline.AddTripChars(_triggerList);
CommentInline.AddTripChars(_triggerList);
StrikethroughTextInline.AddTripChars(_triggerList);
SuperscriptTextInline.AddTripChars(_triggerList);
SubscriptTextInline.AddTripChars(_triggerList);
CodeInline.AddTripChars(_triggerList);
ImageInline.AddTripChars(_triggerList);
EmojiInline.AddTripChars(_triggerList);
LinkAnchorInline.AddTripChars(_triggerList);
// Create an array of characters to search against using IndexOfAny.
_tripCharacters = _triggerList.Select(trigger => trigger.FirstChar).Distinct().ToArray();
}
/// <summary>
/// Finds the next inline element by matching trip chars and verifying the match.
/// </summary>
/// <param name="markdown"> The markdown text to parse. </param>
/// <param name="start"> The position to start parsing. </param>
/// <param name="end"> The position to stop parsing. </param>
/// <param name="ignoreLinks"> Indicates whether to parse links. </param>
/// <returns>Returns the next element</returns>
private static InlineParseResult FindNextInlineElement(string markdown, int start, int end, bool ignoreLinks)
{
// Search for the next inline sequence.
for (int pos = start; pos < end; pos++)
{
// IndexOfAny should be the fastest way to skip characters we don't care about.
pos = markdown.IndexOfAny(_tripCharacters, pos, end - pos);
if (pos < 0)
{
break;
}
// Find the trigger(s) that matched.
char currentChar = markdown[pos];
foreach (InlineTripCharHelper currentTripChar in _triggerList)
{
// Check if our current char matches the suffix char.
if (currentChar == currentTripChar.FirstChar)
{
// Don't match if the previous character was a backslash.
if (pos > start && markdown[pos - 1] == '\\')
{
continue;
}
// If we are here we have a possible match. Call into the inline class to verify.
InlineParseResult parseResult = null;
switch (currentTripChar.Method)
{
case InlineParseMethod.BoldItalic:
parseResult = BoldItalicTextInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Comment:
parseResult = CommentInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.LinkReference:
parseResult = LinkAnchorInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Bold:
parseResult = BoldTextInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Italic:
parseResult = ItalicTextInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.MarkdownLink:
if (!ignoreLinks)
{
parseResult = MarkdownLinkInline.Parse(markdown, pos, end);
}
break;
case InlineParseMethod.AngleBracketLink:
if (!ignoreLinks)
{
parseResult = HyperlinkInline.ParseAngleBracketLink(markdown, pos, end);
}
break;
case InlineParseMethod.Url:
if (!ignoreLinks)
{
parseResult = HyperlinkInline.ParseUrl(markdown, pos, end);
}
break;
case InlineParseMethod.RedditLink:
if (!ignoreLinks)
{
parseResult = HyperlinkInline.ParseRedditLink(markdown, pos, end);
}
break;
case InlineParseMethod.PartialLink:
if (!ignoreLinks)
{
parseResult = HyperlinkInline.ParsePartialLink(markdown, pos, end);
}
break;
case InlineParseMethod.Email:
if (!ignoreLinks)
{
parseResult = HyperlinkInline.ParseEmailAddress(markdown, start, pos, end);
}
break;
case InlineParseMethod.Strikethrough:
parseResult = StrikethroughTextInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Superscript:
parseResult = SuperscriptTextInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Subscript:
parseResult = SubscriptTextInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Code:
parseResult = CodeInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Image:
parseResult = ImageInline.Parse(markdown, pos, end);
break;
case InlineParseMethod.Emoji:
parseResult = EmojiInline.Parse(markdown, pos, end);
break;
}
if (parseResult != null)
{
return(parseResult);
}
}
}
}
// If we didn't find any elements we have a normal text block.
// Let us consume the entire range.
return(new InlineParseResult(TextRunInline.Parse(markdown, start, end), start, end));
}