/// <summary>
/// Attempts to parse an inline code 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 inline code span, or <c>null</c> if this is not an inline code span. </returns>
internal static InlineParseResult Parse(string markdown, int start, int maxEnd)
{
// Check the first char.
if (start == maxEnd || markdown[start] != '`')
{
return(null);
}
// There is an alternate syntax that starts and ends with two backticks.
// e.g. ``sdf`sdf`` would be "sdf`sdf".
int innerStart = start + 1;
int innerEnd, end;
if (innerStart < maxEnd && markdown[innerStart] == '`')
{
// Alternate double back-tick syntax.
innerStart++;
// Find the end of the span.
innerEnd = Common.IndexOf(markdown, "``", innerStart, maxEnd);
if (innerEnd == -1)
{
return(null);
}
end = innerEnd + 2;
}
else
{
// Standard single backtick syntax.
// Find the end of the span.
innerEnd = Common.IndexOf(markdown, '`', innerStart, maxEnd);
if (innerEnd == -1)
{
return(null);
}
end = innerEnd + 1;
}
// The span must contain at least one character.
if (innerStart == innerEnd)
{
return(null);
}
// We found something!
var result = new CodeInline
{
Text = markdown.Substring(innerStart, innerEnd - innerStart).Trim(' ', '\t', '\r', '\n')
};
return(new InlineParseResult(result, start, end));
}
/// <summary>
/// Renders a code element
/// </summary>
/// <param name="element"> The parsed inline element to render. </param>
/// <param name="context"> Persistent state. </param>
protected override void RenderCodeRun(CodeInline element, IRenderContext context)
{
var localContext = context as InlineRenderContext;
if (localContext == null)
{
throw new RenderContextIncorrectException();
}
var text = CreateTextBlock(localContext);
text.Text = CollapseWhitespace(context, element.Text);
text.FontFamily = InlineCodeFontFamily ?? FontFamily;
text.Foreground = InlineCodeForeground ?? Foreground;
if (localContext.WithinItalics)
{
text.FontStyle = FontStyle.Italic;
}
if (localContext.WithinBold)
{
text.FontWeight = FontWeights.Bold;
}
var borderthickness = InlineCodeBorderThickness;
var padding = InlineCodePadding;
var border = new Border
{
BorderThickness = borderthickness,
BorderBrush = InlineCodeBorderBrush,
Background = InlineCodeBackground,
Child = text,
Padding = padding,
Margin = InlineCodeMargin
};
// Aligns content in InlineUI, see https://social.msdn.microsoft.com/Forums/silverlight/en-US/48b5e91e-efc5-4768-8eaf-f897849fcf0b/richtextbox-inlineuicontainer-vertical-alignment-issue?forum=silverlightarchieve
border.RenderTransform = new TranslateTransform
{
Y = 4
};
var inlineUIContainer = new InlineUIContainer
{
Child = border,
};
// Add it to the current inlines
localContext.InlineCollection.Add(inlineUIContainer);
}
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));
}