/// <summary> /// Renders a subscript element. /// </summary> /// <param name="element"> The parsed inline element to render. </param> /// <param name="context"> Persistent state. </param> protected override void RenderSubscriptRun(SubscriptTextInline element, IRenderContext context) { var localContext = context as InlineRenderContext; var parent = localContext?.Parent as TextElement; if (localContext == null && parent == null) { throw new RenderContextIncorrectException(); } var paragraph = new Paragraph { FontSize = parent.FontSize * 0.7, FontFamily = parent.FontFamily, FontStyle = parent.FontStyle, FontWeight = parent.FontWeight }; var childContext = new InlineRenderContext(paragraph.Inlines, context) { Parent = paragraph }; RenderInlineChildren(element.Inlines, childContext); var richTextBlock = CreateOrReuseRichTextBlock(new UIElementCollectionRenderContext(null, context)); richTextBlock.Blocks.Add(paragraph); var border = new Border { Margin = new Thickness(0, 0, 0, (-1) * (paragraph.FontSize * 0.6)), Child = richTextBlock }; 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> /// Attempts to parse a subscript 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 subscript text span, or <c>null</c> if this is not a subscript text span. </returns> internal static InlineParseResult Parse(string markdown, int start, int maxEnd) { // Check the first character. // e.g. "<sub>……</sub>" if (maxEnd - start < 5) { return(null); } if (markdown.Substring(start, 5) != "<sub>") { return(null); } int innerStart = start + 5; int innerEnd = Common.IndexOf(markdown, "</sub>", innerStart, maxEnd); // if don't have the end character or no character between start and end if (innerEnd == -1 || innerEnd == innerStart) { return(null); } // No match if the character after the caret is a space. if (ParseHelpers.IsMarkdownWhiteSpace(markdown[innerStart]) || ParseHelpers.IsMarkdownWhiteSpace(markdown[innerEnd - 1])) { return(null); } // We found something! var result = new SubscriptTextInline { Inlines = Common.ParseInlineChildren(markdown, innerStart, innerEnd) }; return(new InlineParseResult(result, start, innerEnd + 6)); }
/// <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)); }