/// <summary>
/// Renders a code element.
/// </summary>
/// <param name="element"></param>
/// <param name="blockUIElementCollection"></param>
/// <param name="context"></param>
private void RenderCode(CodeBlock element, UIElementCollection blockUIElementCollection, RenderContext context)
{
var textBlock = CreateTextBlock(context);
textBlock.FontFamily = CodeFontFamily ?? FontFamily;
textBlock.Foreground = CodeForeground ?? context.Foreground;
textBlock.LineHeight = FontSize * 1.4;
textBlock.Text = element.Text;
var border = new Border();
border.Background = CodeBackground;
border.BorderBrush = CodeBorderBrush;
border.BorderThickness = CodeBorderThickness;
border.Padding = CodePadding;
border.Margin = CodeMargin;
border.HorizontalAlignment = HorizontalAlignment.Left;
border.Child = textBlock;
// Add it to the blocks
blockUIElementCollection.Add(border);
}
/// <summary>
/// Parses a code block.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location of the first character in the block. </param>
/// <param name="maxEnd"> The location to stop parsing. </param>
/// <param name="quoteDepth"> The current nesting level for block quoting. </param>
/// <param name="actualEnd"> Set to the end of the block when the return value is non-null. </param>
/// <returns> A parsed code block, or <c>null</c> if this is not a code block. </returns>
internal static CodeBlock Parse(string markdown, int start, int maxEnd, int quoteDepth, out int actualEnd)
{
var lines = new List <string>();
StringBuilder code = null;
actualEnd = start;
bool first = true;
bool startWithTripleBackQuote = false;
foreach (var lineInfo in Common.ParseLines(markdown, start, maxEnd, quoteDepth))
{
// Add every line that starts with a tab character or at least 4 spaces.
int pos = lineInfo.StartOfLine;
// Start code with triple backquote
if (first)
{
var firstLine = markdown.Substring(lineInfo.StartOfLine, lineInfo.EndOfLine - lineInfo.StartOfLine);
if (firstLine.Trim() == "```")
{
startWithTripleBackQuote = true;
}
first = false;
continue;
}
// End code with triple backquote
if (startWithTripleBackQuote)
{
if (markdown.Substring(lineInfo.StartOfLine, lineInfo.EndOfLine - lineInfo.StartOfLine).Trim() == "```")
{
actualEnd = lineInfo.StartOfNextLine;
break;
}
}
else
{
// Start code with tab or 4 spaces
if (pos < maxEnd && markdown[pos] == '\t')
{
// tab
pos++;
}
else
{
// 4 spaces
int spaceCount = 0;
while (pos < maxEnd && spaceCount < 4)
{
if (markdown[pos] == ' ')
{
spaceCount++;
}
else if (markdown[pos] == '\t')
{
spaceCount += 4;
}
else
{
break;
}
pos++;
}
// NOT code scope
if (spaceCount < 4)
{
// We found a line that doesn't start with a tab or 4 spaces.
// But don't end the code block until we find a non-blank line.
if (lineInfo.IsLineBlank == false)
{
break;
}
}
}
}
// Separate each line of the code text.
if (code == null)
{
code = new StringBuilder();
}
else
{
lines.Add(code.ToString());
code.Clear();
}
if (lineInfo.IsLineBlank == false)
{
// Append the code text, excluding the first tab/4 spaces, and convert tab characters into spaces.
string lineText = markdown.Substring(pos, lineInfo.EndOfLine - pos);
int startOfLinePos = code.Length;
for (int i = 0; i < lineText.Length; i++)
{
char c = lineText[i];
if (c == '\t')
{
code.Append(' ', 4 - ((code.Length - startOfLinePos) % 4));
}
else
{
code.Append(c);
}
}
}
// Update the end position.
actualEnd = lineInfo.StartOfNextLine;
}
if (code == null)
{
// Not a valid code block.
actualEnd = start;
return(null);
}
else
{
if (code.Length > 0)
{
lines.Add(code.ToString());
code.Clear();
}
}
// Blank lines should be trimmed from the start and end.
var codeBlock = new CodeBlock();
codeBlock.Lines = lines;
return(codeBlock);
}
/// <summary>
/// Renders a code element.
/// </summary>
/// <param name="element"></param>
/// <param name="currentBlocks"></param>
private void RenderCode(CodeBlock element, BlockCollection currentBlocks)
{
// Make the new code paragraph
Paragraph codePara = new Paragraph();
codePara.Margin = new Thickness(12 * element.CodeIndent, 0, 0, 0);
codePara.Foreground = new SolidColorBrush(Color.FromArgb(180, 255, 255, 255));
codePara.FontFamily = new FontFamily("Courier New");
// Add it to the blocks
currentBlocks.Add(codePara);
// Render the children into the para inline.
bool trimTextStart = true;
RenderInlineChildren(element, codePara.Inlines, ref trimTextStart);
}
