public void Draw(TextView textView, DrawingContext drawingContext)
{
var ast = _abstractSyntaxTree;
if (ast == null)
{
return;
}
foreach (var line in textView.VisualLines)
{
var rc = BackgroundGeometryBuilder.GetRectsFromVisualSegment(textView, line, 0, 1000).FirstOrDefault();
if (rc == default(Rect))
{
continue;
}
foreach (var block in AbstractSyntaxTree.EnumerateBlocks(ast.FirstChild))
{
if (block.SourcePosition + block.SourceLength <= line.StartOffset)
{
continue;
}
if (block.SourcePosition > line.LastDocumentLine.EndOffset)
{
break;
}
// Indented code does not terminate (at least in the AST) until a new
// block is encountered. Thus blank lines at the end of the block are
// highlighted. It looks much better if they're not highlighted.
if (block.Tag == BlockTag.IndentedCode)
{
var length = block.SourcePosition + block.SourceLength - line.StartOffset;
if (line.StartOffset + length > textView.Document.TextLength)
{
break;
}
var remainder = textView.Document.GetText(line.StartOffset, length);
if (string.IsNullOrWhiteSpace(remainder))
{
break;
}
}
if (_blockTags.Any(tag => tag == block.Tag))
{
Brush brush;
if (_brushes.TryGetValue(block.Tag, out brush) && brush != null)
{
drawingContext.DrawRectangle(brush, null,
new Rect(0, rc.Top, textView.ActualWidth, line.Height));
}
}
}
}
}
public static string ToHtml(string markdown)
{
var ast = AbstractSyntaxTree.GenerateAbstractSyntaxTree(markdown);
markdown = markdown.ConvertEmojis(ast);
var converter = GetMarkdownConverter();
return(converter.ConvertToHtml(markdown));
}
public static string ConvertEmojis(this string markdown, Block ast)
{
return(Scan.Replace(markdown, match =>
{
if (!AbstractSyntaxTree.PositionSafeForSmartLink(ast, match.Index, match.Length))
{
return match.Value;
}
string value;
return Emojis.TryGetValue(match.Value, out value)
? $"<i class=\"_sprite {value}\"/>"
: match.Value;
}));
}
