WpfXamlRenderer.cs

using SkiaSharp;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using Waher.Content.Emoji;
using Waher.Content.Markdown.Model;
using Waher.Content.Markdown.Model.BlockElements;
using Waher.Content.Markdown.Model.Multimedia;
using Waher.Content.Markdown.Model.SpanElements;
using Waher.Content.Markdown.Rendering;
using Waher.Content.Xml;
using Waher.Events;
using Waher.Script;
using Waher.Script.Graphs;
using Waher.Script.Operators.Matrices;
 
namespace Waher.Content.Markdown.Wpf
{
    public class WpfXamlRenderer : Renderer
    {
        public readonly XmlWriter XmlOutput;
 
        public readonly XamlSettings XamlSettings;
 
        public TextAlignment Alignment = TextAlignment.Left;
 
        public WpfXamlRenderer()
            : this(new XamlSettings())
        {
        }
 
        public WpfXamlRenderer(XmlWriterSettings XmlSettings)
            : this(XmlSettings, new XamlSettings())
        {
        }
 
        public WpfXamlRenderer(XamlSettings XamlSettings)
            : this(XML.WriterSettings(false, true), XamlSettings)
        {
        }
 
        public WpfXamlRenderer(XmlWriterSettings XmlSettings, XamlSettings XamlSettings)
            : base()
        {
            this.XamlSettings = XamlSettings;
            this.XmlOutput = XmlWriter.Create(this.Output, XmlSettings);
        }
 
        public WpfXamlRenderer(StringBuilder Output, XmlWriterSettings XmlSettings, XamlSettings XamlSettings)
            : base(Output)
        {
            this.XamlSettings = XamlSettings;
            this.XmlOutput = XmlWriter.Create(this.Output, XmlSettings);
        }
 
        public override void Dispose()
        {
            base.Dispose();
 
            this.XmlOutput.Dispose();
        }
 
        public override Task RenderDocument(MarkdownDocument Document, bool Inclusion)
        {
            this.Alignment = TextAlignment.Left;
 
            return base.RenderDocument(Document, Inclusion);
        }
 
        public override Task RenderDocumentHeader()
        {
            this.XmlOutput.WriteStartElement("StackPanel", "http://schemas.microsoft.com/winfx/2006/xaml/presentation");
            this.XmlOutput.WriteAttributeString("xmlns", "x", null, "http://schemas.microsoft.com/winfx/2006/xaml");
 
            return Task.CompletedTask;
        }
 
        public override async Task RenderFootnotes()
        {
            Footnote Footnote;
            string FootnoteMargin = "0," + this.XamlSettings.ParagraphMarginTop.ToString() + "," +
                this.XamlSettings.FootnoteSeparator.ToString() + "," +
                this.XamlSettings.ParagraphMarginBottom.ToString();
            string Scale = CommonTypes.Encode(this.XamlSettings.SuperscriptScale);
            string Offset = this.XamlSettings.SuperscriptOffset.ToString();
            int Nr;
            int Row = 0;
 
            this.XmlOutput.WriteElementString("Separator", string.Empty);
 
            this.XmlOutput.WriteStartElement("Grid");
            this.XmlOutput.WriteStartElement("Grid.ColumnDefinitions");
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "Auto");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "*");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteStartElement("Grid.RowDefinitions");
 
            foreach (string Key in this.Document.FootnoteOrder)
            {
                if ((this.Document?.TryGetFootnoteNumber(Key, out Nr) ?? false) &&
                    (this.Document?.TryGetFootnote(Key, out Footnote) ?? false) &&
                    Footnote.Referenced)
                {
                    this.XmlOutput.WriteStartElement("RowDefinition");
                    this.XmlOutput.WriteAttributeString("Height", "Auto");
                    this.XmlOutput.WriteEndElement();
                }
            }
 
            this.XmlOutput.WriteEndElement();
 
            foreach (string Key in this.Document.FootnoteOrder)
            {
                if ((this.Document?.TryGetFootnoteNumber(Key, out Nr) ?? false) &&
                    (this.Document?.TryGetFootnote(Key, out Footnote) ?? false) &&
                    Footnote.Referenced)
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("Text", Nr.ToString());
                    this.XmlOutput.WriteAttributeString("Margin", FootnoteMargin);
                    this.XmlOutput.WriteAttributeString("Grid.Column", "0");
                    this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
 
                    this.XmlOutput.WriteStartElement("TextBlock.LayoutTransform");
                    this.XmlOutput.WriteStartElement("TransformGroup");
 
                    this.XmlOutput.WriteStartElement("ScaleTransform");
                    this.XmlOutput.WriteAttributeString("ScaleX", Scale);
                    this.XmlOutput.WriteAttributeString("ScaleY", Scale);
                    this.XmlOutput.WriteEndElement();
 
                    this.XmlOutput.WriteStartElement("TranslateTransform");
                    this.XmlOutput.WriteAttributeString("Y", Offset);
                    this.XmlOutput.WriteEndElement();
 
                    this.XmlOutput.WriteEndElement();
                    this.XmlOutput.WriteEndElement();
                    this.XmlOutput.WriteEndElement();
 
                    if (Footnote.InlineSpanElement && !Footnote.OutsideParagraph)
                    {
                        this.XmlOutput.WriteStartElement("TextBlock");
                        this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                    }
                    else
                        this.XmlOutput.WriteStartElement("StackPanel");
 
                    this.XmlOutput.WriteAttributeString("Grid.Column", "1");
                    this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
 
                    TextAlignment Bak = this.Alignment;
                    this.Alignment = TextAlignment.Left;
 
                    await Footnote.Render(this);
                    this.Alignment = Bak;
 
                    this.XmlOutput.WriteEndElement();
 
                    Row++;
                }
            }
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task RenderDocumentFooter()
        {
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.Flush();
 
            return Task.CompletedTask;
        }
 
        #region Span Elements
 
        public override Task Render(Abbreviation Element)
        {
            return this.RenderChildren(Element);
        }
 
        public override Task Render(AutomaticLinkMail Element)
        {
            this.XmlOutput.WriteStartElement("Hyperlink");
            this.XmlOutput.WriteAttributeString("NavigateUri", "mailto:" + Element.EMail);
            this.XmlOutput.WriteValue(Element.EMail);
            this.XmlOutput.WriteEndElement();
 
            return Task.CompletedTask;
        }
 
        public override Task Render(AutomaticLinkUrl Element)
        {
            this.XmlOutput.WriteStartElement("Hyperlink");
            this.XmlOutput.WriteAttributeString("NavigateUri", this.Document.CheckURL(Element.URL, null));
            this.XmlOutput.WriteValue(Element.URL);
            this.XmlOutput.WriteEndElement();
 
            return Task.CompletedTask;
        }
 
        public override async Task Render(Delete Element)
        {
            this.XmlOutput.WriteStartElement("TextBlock");
            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
 
            if (this.Alignment != TextAlignment.Left)
                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
            this.XmlOutput.WriteStartElement("TextBlock.TextDecorations");
            this.XmlOutput.WriteStartElement("TextDecoration");
            this.XmlOutput.WriteAttributeString("Location", "Strikethrough");
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteEndElement();
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(DetailsReference Element)
        {
            if (!(this.Document.Detail is null))
                return this.RenderDocument(this.Document.Detail, false);
            else
                return this.Render((MetaReference)Element);
        }
 
        public override async Task Render(EmojiReference Element)
        {
            IEmojiSource EmojiSource = this.Document.EmojiSource;
 
            if (EmojiSource is null)
            {
                this.XmlOutput.WriteValue(Element.Delimiter);
                this.XmlOutput.WriteValue(Element.Emoji.ShortName);
                this.XmlOutput.WriteValue(Element.Delimiter);
            }
            else if (!EmojiSource.EmojiSupported(Element.Emoji))
                this.XmlOutput.WriteValue(Element.Emoji.Unicode);
            else
            {
                IImageSource Source = await EmojiSource.GetImageSource(Element.Emoji, Element.Level);
                await Multimedia.ImageContent.OutputWpf(this.XmlOutput, Source, Element.Emoji.Description);
            }
        }
 
        public override async Task Render(Emphasize Element)
        {
            this.XmlOutput.WriteStartElement("Italic");
            await this.RenderChildren(Element);
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(FootnoteReference Element)
        {
            if (!(this.Document?.TryGetFootnote(Element.Key, out Footnote Footnote) ?? false))
                Footnote = null;
 
            if (Element.AutoExpand && !(Footnote is null))
                await this.Render(Footnote);
            else if (this.Document?.TryGetFootnoteNumber(Element.Key, out int Nr) ?? false)
            {
                string s;
 
                this.XmlOutput.WriteStartElement("TextBlock");
                this.XmlOutput.WriteAttributeString("Text", Nr.ToString());
 
                this.XmlOutput.WriteStartElement("TextBlock.LayoutTransform");
                this.XmlOutput.WriteStartElement("TransformGroup");
 
                this.XmlOutput.WriteStartElement("ScaleTransform");
                this.XmlOutput.WriteAttributeString("ScaleX", s = CommonTypes.Encode(this.XamlSettings.SuperscriptScale));
                this.XmlOutput.WriteAttributeString("ScaleY", s);
                this.XmlOutput.WriteEndElement();
 
                this.XmlOutput.WriteStartElement("TranslateTransform");
                this.XmlOutput.WriteAttributeString("Y", this.XamlSettings.SuperscriptOffset.ToString());
                this.XmlOutput.WriteEndElement();
 
                this.XmlOutput.WriteEndElement();
                this.XmlOutput.WriteEndElement();
                this.XmlOutput.WriteEndElement();
 
                if (!(Footnote is null))
                    Footnote.Referenced = true;
            }
        }
 
        public override Task Render(HashTag Element)
        {
            this.XmlOutput.WriteValue(Element.Tag);
 
            return Task.CompletedTask;
        }
 
        public override Task Render(HtmlEntity Element)
        {
            string s = Html.HtmlEntity.EntityToCharacter(Element.Entity);
            if (s is null)
                this.XmlOutput.WriteRaw("&" + Element.Entity + ";");
            else
                this.XmlOutput.WriteValue(s);
 
            return Task.CompletedTask;
        }
 
        public override Task Render(HtmlEntityUnicode Element)
        {
            this.XmlOutput.WriteValue(new string((char)Element.Code, 1));
 
            return Task.CompletedTask;
        }
 
        public override Task Render(InlineCode Element)
        {
            this.XmlOutput.WriteStartElement("TextBlock");
            this.XmlOutput.WriteAttributeString("xml", "space", null, "preserve");
            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
            this.XmlOutput.WriteAttributeString("FontFamily", "Courier New");
            if (this.Alignment != TextAlignment.Left)
                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
            this.XmlOutput.WriteValue(Element.Code);
 
            this.XmlOutput.WriteEndElement();
 
            return Task.CompletedTask;
        }
 
        public override Task Render(InlineHTML Element)
        {
            this.XmlOutput.WriteComment(Element.HTML);
 
            return Task.CompletedTask;
        }
 
        public override async Task Render(InlineScript Element)
        {
            object Result = await Element.EvaluateExpression();
            await this.RenderObject(Result, Element.AloneInParagraph, Element.Variables);
        }
 
        public async Task RenderObject(object Result, bool AloneInParagraph, Variables Variables)
        {
            if (Result is null)
                return;
 
            string s;
 
            if (Result is XmlDocument Xml)
                Result = await MarkdownDocument.TransformXml(Xml, Variables);
            else if (Result is IToMatrix ToMatrix)
                Result = ToMatrix.ToMatrix();
 
            if (Result is Graph G)
            {
                PixelInformation Pixels = G.CreatePixels();
                byte[] Bin = Pixels.EncodeAsPng();
 
                s = "data:image/png;base64," + Convert.ToBase64String(Bin, 0, Bin.Length);
 
                await Multimedia.ImageContent.OutputWpf(this.XmlOutput, new ImageSource()
                {
                    Url = s,
                    Width = Pixels.Width,
                    Height = Pixels.Height
                }, string.Empty);
            }
            else if (Result is SKImage Img)
            {
                using (SKData Data = Img.Encode(SKEncodedImageFormat.Png, 100))
                {
                    byte[] Bin = Data.ToArray();
 
                    s = "data:image/png;base64," + Convert.ToBase64String(Bin, 0, Bin.Length);
 
                    await Multimedia.ImageContent.OutputWpf(this.XmlOutput, new ImageSource()
                    {
                        Url = s,
                        Width = Img.Width,
                        Height = Img.Height
                    }, string.Empty);
                }
            }
            else if (Result is MarkdownDocument Doc)
            {
                await this.RenderDocument(Doc, true);   // Does not call ProcessAsyncTasks()
                Doc.ProcessAsyncTasks();
            }
            else if (Result is MarkdownContent Markdown)
            {
                Doc = await MarkdownDocument.CreateAsync(Markdown.Markdown, Markdown.Settings ?? new MarkdownSettings());
                await this.RenderDocument(Doc, true);   // Does not call ProcessAsyncTasks()
                Doc.ProcessAsyncTasks();
            }
            else if (Result is Exception ex)
            {
                ex = Log.UnnestException(ex);
 
                if (ex is AggregateException ex2)
                {
                    foreach (Exception ex3 in ex2.InnerExceptions)
                    {
                        this.XmlOutput.WriteStartElement("TextBlock");
                        this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                        this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
 
                        if (this.Alignment != TextAlignment.Left)
                            this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                        this.XmlOutput.WriteAttributeString("Foreground", "Red");
                        this.XmlOutput.WriteValue(ex3.Message);
                        this.XmlOutput.WriteEndElement();
                    }
                }
                else
                {
                    if (AloneInParagraph)
                    {
                        this.XmlOutput.WriteStartElement("TextBlock");
                        this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                        this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
                        if (this.Alignment != TextAlignment.Left)
                            this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
                    }
                    else
                        this.XmlOutput.WriteStartElement("Run");
 
                    this.XmlOutput.WriteAttributeString("Foreground", "Red");
                    this.XmlOutput.WriteValue(ex.Message);
                    this.XmlOutput.WriteEndElement();
                }
            }
            else
            {
                if (AloneInParagraph)
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                    this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
                    if (this.Alignment != TextAlignment.Left)
                        this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
                }
 
                this.XmlOutput.WriteValue(Result.ToString());
 
                if (AloneInParagraph)
                    this.XmlOutput.WriteEndElement();
            }
        }
 
        public override Task Render(InlineText Element)
        {
            this.XmlOutput.WriteValue(Element.Value);
 
            return Task.CompletedTask;
        }
 
        public override async Task Render(Insert Element)
        {
            this.XmlOutput.WriteStartElement("Underline");
            await this.RenderChildren(Element);
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(LineBreak Element)
        {
            this.XmlOutput.WriteElementString("LineBreak", string.Empty);
 
            return Task.CompletedTask;
        }
 
        public override Task Render(Link Element)
        {
            return this.Render(Element.Url, Element.Title, Element.Children, Element.Document);
        }
 
        public async Task Render(string Url, string Title, IEnumerable<MarkdownElement> ChildNodes, MarkdownDocument Document)
        {
            this.XmlOutput.WriteStartElement("Hyperlink");
            this.XmlOutput.WriteAttributeString("NavigateUri", Document.CheckURL(Url, null));
 
            if (!string.IsNullOrEmpty(Title))
                this.XmlOutput.WriteAttributeString("ToolTip", Title);
 
            foreach (MarkdownElement E in ChildNodes)
                await E.Render(this);
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(LinkReference Element)
        {
            Model.SpanElements.Multimedia Multimedia = this.Document.GetReference(Element.Label);
 
            if (!(Multimedia is null))
                return this.Render(Multimedia.Items[0].Url, Multimedia.Items[0].Title, Element.Children, Element.Document);
            else
                return this.RenderChildren(Element);
        }
 
        public override Task Render(MetaReference Element)
        {
            bool FirstOnRow = true;
 
            if (Element.TryGetMetaData(out KeyValuePair<string, bool>[] Values))
            {
                foreach (KeyValuePair<string, bool> P in Values)
                {
                    if (FirstOnRow)
                        FirstOnRow = false;
                    else
                        this.XmlOutput.WriteValue(' ');
 
                    this.XmlOutput.WriteValue(P.Key);
                    if (P.Value)
                    {
                        this.XmlOutput.WriteElementString("LineBreak", string.Empty);
                        FirstOnRow = true;
                    }
                }
            }
 
            return Task.CompletedTask;
        }
 
        public override Task Render(Model.SpanElements.Multimedia Element)
        {
            IMultimediaWpfXamlRenderer Renderer = Element.MultimediaHandler<IMultimediaWpfXamlRenderer>();
            if (Renderer is null)
                return this.RenderChildren(Element);
            else
                return Renderer.RenderWpfXaml(this, Element.Items, Element.Children, Element.AloneInParagraph, Element.Document);
        }
 
        public override Task Render(MultimediaReference Element)
        {
            Model.SpanElements.Multimedia Multimedia = Element.Document.GetReference(Element.Label);
 
            if (!(Multimedia is null))
            {
                IMultimediaWpfXamlRenderer Renderer = Multimedia.MultimediaHandler<IMultimediaWpfXamlRenderer>();
                if (!(Renderer is null))
                    return Renderer.RenderWpfXaml(this, Multimedia.Items, Element.Children, Element.AloneInParagraph, Element.Document);
            }
 
            return this.RenderChildren(Element);
        }
 
        public override async Task Render(StrikeThrough Element)
        {
            this.XmlOutput.WriteStartElement("TextBlock");
            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
            if (this.Alignment != TextAlignment.Left)
                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
            this.XmlOutput.WriteStartElement("TextBlock.TextDecorations");
            this.XmlOutput.WriteStartElement("TextDecoration");
            this.XmlOutput.WriteAttributeString("Location", "Strikethrough");
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteEndElement();
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(Strong Element)
        {
            this.XmlOutput.WriteStartElement("Bold");
            await this.RenderChildren(Element);
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(SubScript Element)
        {
            this.XmlOutput.WriteStartElement("Run");
            this.XmlOutput.WriteAttributeString("Typography.Variants", "Subscript");
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(SuperScript Element)
        {
            this.XmlOutput.WriteStartElement("Run");
            this.XmlOutput.WriteAttributeString("Typography.Variants", "Superscript");
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(Underline Element)
        {
            this.XmlOutput.WriteStartElement("Underline");
            await this.RenderChildren(Element);
            this.XmlOutput.WriteEndElement();
        }
 
        #endregion
 
        #region Block elements
 
        public override async Task Render(BlockQuote Element)
        {
            this.XmlOutput.WriteStartElement("Border");
            this.XmlOutput.WriteAttributeString("BorderThickness", this.XamlSettings.BlockQuoteBorderThickness.ToString() + ",0,0,0");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.BlockQuoteMargin.ToString() + "," +
                this.XamlSettings.ParagraphMarginTop.ToString() + ",0," + this.XamlSettings.ParagraphMarginBottom.ToString());
            this.XmlOutput.WriteAttributeString("Padding", this.XamlSettings.BlockQuotePadding.ToString() + ",0,0,0");
            this.XmlOutput.WriteAttributeString("BorderBrush", this.XamlSettings.BlockQuoteBorderColor);
            this.XmlOutput.WriteStartElement("StackPanel");
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(BulletList Element)
        {
            int Row = 0;
            bool ParagraphBullet;
 
            this.XmlOutput.WriteStartElement("Grid");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            this.XmlOutput.WriteStartElement("Grid.ColumnDefinitions");
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "Auto");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "*");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteStartElement("Grid.RowDefinitions");
 
            foreach (MarkdownElement _ in Element.Children)
            {
                this.XmlOutput.WriteStartElement("RowDefinition");
                this.XmlOutput.WriteAttributeString("Height", "Auto");
                this.XmlOutput.WriteEndElement();
            }
 
            this.XmlOutput.WriteEndElement();
 
            foreach (MarkdownElement E in Element.Children)
            {
                ParagraphBullet = !E.InlineSpanElement || E.OutsideParagraph;
                this.GetMargins(E, out int TopMargin, out int BottomMargin);
 
                this.XmlOutput.WriteStartElement("TextBlock");
                this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                this.XmlOutput.WriteAttributeString("Grid.Column", "0");
                this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
                if (this.Alignment != TextAlignment.Left)
                    this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                this.XmlOutput.WriteAttributeString("Margin", "0," + TopMargin.ToString() + "," +
                    this.XamlSettings.ListContentMargin.ToString() + "," + BottomMargin.ToString());
 
                this.XmlOutput.WriteValue("•");
                this.XmlOutput.WriteEndElement();
 
                this.XmlOutput.WriteStartElement("StackPanel");
                this.XmlOutput.WriteAttributeString("Grid.Column", "1");
                this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
 
                if (ParagraphBullet)
                    await E.Render(this);
                else
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                    if (this.Alignment != TextAlignment.Left)
                        this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                    await E.Render(this);
 
                    this.XmlOutput.WriteEndElement();
                }
 
                this.XmlOutput.WriteEndElement();
 
                Row++;
            }
 
            this.XmlOutput.WriteEndElement();
        }
 
        private void GetMargins(MarkdownElement Element, out int TopMargin, out int BottomMargin)
        {
            if (Element.InlineSpanElement && !Element.OutsideParagraph)
            {
                TopMargin = 0;
                BottomMargin = 0;
            }
            else if (Element is NestedBlock NestedBlock)
            {
                bool First = true;
 
                TopMargin = BottomMargin = 0;
 
                foreach (MarkdownElement E in NestedBlock.Children)
                {
                    if (First)
                    {
                        First = false;
                        this.GetMargins(E, out TopMargin, out BottomMargin);
                    }
                    else
                        this.GetMargins(E, out int _, out BottomMargin);
                }
            }
            else if (Element is MarkdownElementSingleChild SingleChild)
                this.GetMargins(SingleChild.Child, out TopMargin, out BottomMargin);
            else
            {
                TopMargin = this.XamlSettings.ParagraphMarginTop;
                BottomMargin = this.XamlSettings.ParagraphMarginBottom;
            }
        }
 
        public override async Task Render(CenterAligned Element)
        {
            this.XmlOutput.WriteStartElement("StackPanel");
 
            TextAlignment Bak = this.Alignment;
            this.Alignment = TextAlignment.Center;
 
            await this.RenderChildren(Element);
 
            this.Alignment = Bak;
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(CodeBlock Element)
        {
            ICodeContentWpfXamlRenderer Renderer = Element.CodeContentHandler<ICodeContentWpfXamlRenderer>();
 
            if (!(Renderer is null))
            {
                try
                {
                    if (await Renderer.RenderWpfXaml(this, Element.Rows, Element.Language, Element.Indent, Element.Document))
                        return;
                }
                catch (Exception ex)
                {
                    ex = Log.UnnestException(ex);
 
                    if (ex is AggregateException ex2)
                    {
                        foreach (Exception ex3 in ex2.InnerExceptions)
                        {
                            this.XmlOutput.WriteStartElement("TextBlock");
                            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
 
                            if (this.Alignment != TextAlignment.Left)
                                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                            this.XmlOutput.WriteAttributeString("Foreground", "Red");
                            this.XmlOutput.WriteValue(ex3.Message);
                            this.XmlOutput.WriteEndElement();
                        }
                    }
                    else
                    {
                        this.XmlOutput.WriteStartElement("TextBlock");
                        this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                        this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
                        if (this.Alignment != TextAlignment.Left)
                            this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                        this.XmlOutput.WriteAttributeString("Foreground", "Red");
                        this.XmlOutput.WriteValue(ex.Message);
                        this.XmlOutput.WriteEndElement();
                    }
                }
            }
 
            int i;
            bool First = true;
 
            this.XmlOutput.WriteStartElement("TextBlock");
            this.XmlOutput.WriteAttributeString("xml", "space", null, "preserve");
            this.XmlOutput.WriteAttributeString("TextWrapping", "NoWrap");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            this.XmlOutput.WriteAttributeString("FontFamily", "Courier New");
            if (this.Alignment != TextAlignment.Left)
                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
            for (i = Element.Start; i <= Element.End; i++)
            {
                if (First)
                    First = false;
                else
                    this.XmlOutput.WriteElementString("LineBreak", string.Empty);
 
                this.XmlOutput.WriteValue(Element.Rows[i]);
            }
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(CommentBlock Element)
        {
            return Task.CompletedTask;
        }
 
        public override async Task Render(DefinitionDescriptions Element)
        {
            MarkdownElement Last = null;
 
            foreach (MarkdownElement Description in Element.Children)
                Last = Description;
 
            foreach (MarkdownElement Description in Element.Children)
            {
                if (Description.InlineSpanElement && !Description.OutsideParagraph)
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                }
                else
                    this.XmlOutput.WriteStartElement("StackPanel");
 
                this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.DefinitionMargin.ToString() + ",0,0," +
                    (Description == Last ? this.XamlSettings.DefinitionSeparator : 0).ToString());
 
                await Description.Render(this);
                this.XmlOutput.WriteEndElement();
            }
        }
 
        public override Task Render(DefinitionList Element)
        {
            return this.RenderChildren(Element);
        }
 
        public override async Task Render(DefinitionTerms Element)
        {
            int TopMargin = this.XamlSettings.ParagraphMarginTop;
 
            foreach (MarkdownElement Term in Element.Children)
            {
                this.XmlOutput.WriteStartElement("TextBlock");
                this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMarginLeft.ToString() + "," +
                    TopMargin.ToString() + "," + this.XamlSettings.ParagraphMarginRight.ToString() + ",0");
                this.XmlOutput.WriteAttributeString("FontWeight", "Bold");
 
                await Term.Render(this);
 
                this.XmlOutput.WriteEndElement();
                TopMargin = 0;
            }
        }
 
        public override async Task Render(DeleteBlocks Element)
        {
            this.XmlOutput.WriteStartElement("Border");
            this.XmlOutput.WriteAttributeString("BorderThickness", this.XamlSettings.BlockQuoteBorderThickness.ToString() + ",0,0,0");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.BlockQuoteMargin.ToString() + "," +
                this.XamlSettings.ParagraphMarginTop.ToString() + ",0," + this.XamlSettings.ParagraphMarginBottom.ToString());
            this.XmlOutput.WriteAttributeString("Padding", this.XamlSettings.BlockQuotePadding.ToString() + ",0,0,0");
            this.XmlOutput.WriteAttributeString("BorderBrush", this.XamlSettings.DeletedBlockQuoteBorderColor);
            this.XmlOutput.WriteStartElement("StackPanel");
 
            foreach (MarkdownElement E in Element.Children)
                await E.Render(this);
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(Footnote Element)
        {
            return this.RenderChildren(Element);
        }
 
        public override async Task Render(Header Element)
        {
            this.XmlOutput.WriteStartElement("TextBlock");
            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            if (this.Alignment != TextAlignment.Left)
                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
            if (Element.Level > 0 && Element.Level <= this.XamlSettings.HeaderFontSize.Length)
            {
                this.XmlOutput.WriteAttributeString("FontSize", this.XamlSettings.HeaderFontSize[Element.Level - 1].ToString());
                this.XmlOutput.WriteAttributeString("Foreground", this.XamlSettings.HeaderForegroundColor[Element.Level - 1].ToString());
            }
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(HorizontalRule Element)
        {
            this.XmlOutput.WriteElementString("Separator", string.Empty);
 
            return Task.CompletedTask;
        }
 
        public override async Task Render(HtmlBlock Element)
        {
            this.XmlOutput.WriteStartElement("TextBlock");
            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            if (this.Alignment != TextAlignment.Left)
                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(InsertBlocks Element)
        {
            this.XmlOutput.WriteStartElement("Border");
            this.XmlOutput.WriteAttributeString("BorderThickness", this.XamlSettings.BlockQuoteBorderThickness.ToString() + ",0,0,0");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.BlockQuoteMargin.ToString() + "," +
                this.XamlSettings.ParagraphMarginTop.ToString() + ",0," + this.XamlSettings.ParagraphMarginBottom.ToString());
            this.XmlOutput.WriteAttributeString("Padding", this.XamlSettings.BlockQuotePadding.ToString() + ",0,0,0");
            this.XmlOutput.WriteAttributeString("BorderBrush", this.XamlSettings.InsertedBlockQuoteBorderColor);
            this.XmlOutput.WriteStartElement("StackPanel");
 
            await this.RenderChildren(Element);
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(InvisibleBreak Element)
        {
            return Task.CompletedTask;
        }
 
        public override async Task Render(LeftAligned Element)
        {
            this.XmlOutput.WriteStartElement("StackPanel");
 
            TextAlignment Bak = this.Alignment;
            this.Alignment = TextAlignment.Left;
 
            await this.RenderChildren(Element);
 
            this.Alignment = Bak;
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(MarginAligned Element)
        {
            this.XmlOutput.WriteStartElement("StackPanel");
 
            TextAlignment Bak = this.Alignment;
            this.Alignment = TextAlignment.Left;
 
            await this.RenderChildren(Element);
 
            this.Alignment = Bak;
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(NestedBlock Element)
        {
            if (Element.HasOneChild)
                await Element.FirstChild.Render(this);
            else
            {
                bool SpanOpen = false;
 
                foreach (MarkdownElement E in Element.Children)
                {
                    if (E.InlineSpanElement)
                    {
                        if (!SpanOpen)
                        {
                            this.XmlOutput.WriteStartElement("TextBlock");
                            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                            if (this.Alignment != TextAlignment.Left)
                                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
                            SpanOpen = true;
                        }
                    }
                    else
                    {
                        if (SpanOpen)
                        {
                            this.XmlOutput.WriteEndElement();
                            SpanOpen = false;
                        }
                    }
 
                    await E.Render(this);
                }
 
                if (SpanOpen)
                    this.XmlOutput.WriteEndElement();
            }
        }
 
        public override Task Render(NumberedItem Element)
        {
            return this.RenderChild(Element);
        }
 
        public override async Task Render(NumberedList Element)
        {
            NumberedItem Item;
            int Expected = 0;
            int Row = 0;
            bool ParagraphBullet;
 
            this.XmlOutput.WriteStartElement("Grid");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            this.XmlOutput.WriteStartElement("Grid.ColumnDefinitions");
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "Auto");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "*");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteStartElement("Grid.RowDefinitions");
 
            foreach (MarkdownElement _ in Element.Children)
            {
                this.XmlOutput.WriteStartElement("RowDefinition");
                this.XmlOutput.WriteAttributeString("Height", "Auto");
                this.XmlOutput.WriteEndElement();
            }
 
            this.XmlOutput.WriteEndElement();
 
            foreach (MarkdownElement E in Element.Children)
            {
                Expected++;
                Item = E as NumberedItem;
 
                ParagraphBullet = !E.InlineSpanElement || E.OutsideParagraph;
                this.GetMargins(E, out int TopMargin, out int BottomMargin);
 
                this.XmlOutput.WriteStartElement("TextBlock");
                this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                this.XmlOutput.WriteAttributeString("Grid.Column", "0");
                this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
                if (this.Alignment != TextAlignment.Left)
                    this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                this.XmlOutput.WriteAttributeString("Margin", "0," + TopMargin.ToString() + "," +
                    this.XamlSettings.ListContentMargin.ToString() + "," + BottomMargin.ToString());
 
                if (!(Item is null))
                    this.XmlOutput.WriteValue((Expected = Item.Number).ToString());
                else
                    this.XmlOutput.WriteValue(Expected.ToString());
 
                this.XmlOutput.WriteValue(".");
                this.XmlOutput.WriteEndElement();
 
                this.XmlOutput.WriteStartElement("StackPanel");
                this.XmlOutput.WriteAttributeString("Grid.Column", "1");
                this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
 
                if (ParagraphBullet)
                    await E.Render(this);
                else
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                    if (this.Alignment != TextAlignment.Left)
                        this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                    await E.Render(this);
 
                    this.XmlOutput.WriteEndElement();
                }
 
                this.XmlOutput.WriteEndElement();
 
                Row++;
            }
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(Paragraph Element)
        {
            BaselineAlignment s;
 
            this.XmlOutput.WriteStartElement("TextBlock");
            this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            if (this.Alignment != TextAlignment.Left)
                this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
            foreach (MarkdownElement E in Element.Children)
            {
                if ((!E.InlineSpanElement || E.OutsideParagraph) && (s = E.BaselineAlignment) != BaselineAlignment.Baseline)
                {
                    this.XmlOutput.WriteStartElement("InlineUIContainer");
                    this.XmlOutput.WriteAttributeString("BaselineAlignment", s.ToString());
 
                    await E.Render(this);
 
                    this.XmlOutput.WriteEndElement();
                }
                else
                    await E.Render(this);
            }
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override async Task Render(RightAligned Element)
        {
            this.XmlOutput.WriteStartElement("StackPanel");
 
            TextAlignment Bak = this.Alignment;
            this.Alignment = TextAlignment.Right;
 
            await this.RenderChildren(Element);
 
            this.Alignment = Bak;
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(Sections Element)
        {
            return this.RenderChildren(Element);
        }
 
        public override Task Render(SectionSeparator Element)
        {
            this.XmlOutput.WriteElementString("Separator", string.Empty);
 
            return Task.CompletedTask;
        }
 
        public override async Task Render(Table Element)
        {
            int Column;
            int Row, NrRows;
            int RowNr = 0;
            int NrColumns = Element.Columns;
 
            this.XmlOutput.WriteStartElement("Grid");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            if (!string.IsNullOrEmpty(Element.Caption))
                this.XmlOutput.WriteAttributeString("ToolTip", Element.Caption);
 
            this.XmlOutput.WriteStartElement("Grid.ColumnDefinitions");
 
            for (Column = 0; Column < NrColumns; Column++)
            {
                this.XmlOutput.WriteStartElement("ColumnDefinition");
                this.XmlOutput.WriteAttributeString("Width", "Auto");
                this.XmlOutput.WriteEndElement();
            }
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteStartElement("Grid.RowDefinitions");
 
            for (Row = 0, NrRows = Element.Rows.Length + Element.Headers.Length; Row < NrRows; Row++)
            {
                this.XmlOutput.WriteStartElement("RowDefinition");
                this.XmlOutput.WriteAttributeString("Height", "Auto");
                this.XmlOutput.WriteEndElement();
            }
 
            this.XmlOutput.WriteEndElement();
 
            for (Row = 0, NrRows = Element.Headers.Length; Row < NrRows; Row++, RowNr++)
                await this.Render(Element.Headers[Row], Element.HeaderCellAlignments[Row], RowNr, true, Element);
 
            for (Row = 0, NrRows = Element.Rows.Length; Row < NrRows; Row++, RowNr++)
                await this.Render(Element.Rows[Row], Element.RowCellAlignments[Row], RowNr, false, Element);
 
            this.XmlOutput.WriteEndElement();
        }
 
        private async Task Render(MarkdownElement[] CurrentRow, TextAlignment?[] CellAlignments, int RowNr, bool Bold, Table Element)
        {
            TextAlignment Bak = this.Alignment;
            MarkdownElement E;
            int NrColumns = Element.Columns;
            int Column;
            int ColSpan;
 
            for (Column = 0; Column < NrColumns; Column++)
            {
                E = CurrentRow[Column];
                if (E is null)
                    continue;
 
                this.Alignment = CellAlignments[Column] ?? Element.ColumnAlignments[Column];
                ColSpan = Column + 1;
                while (ColSpan < NrColumns && CurrentRow[ColSpan] is null)
                    ColSpan++;
 
                ColSpan -= Column;
 
                this.XmlOutput.WriteStartElement("Border");
                this.XmlOutput.WriteAttributeString("BorderBrush", this.XamlSettings.TableCellBorderColor);
                this.XmlOutput.WriteAttributeString("BorderThickness", CommonTypes.Encode(this.XamlSettings.TableCellBorderThickness));
 
                if ((RowNr & 1) == 0)
                {
                    if (!string.IsNullOrEmpty(this.XamlSettings.TableCellRowBackgroundColor1))
                        this.XmlOutput.WriteAttributeString("Background", this.XamlSettings.TableCellRowBackgroundColor1);
                }
                else
                {
                    if (!string.IsNullOrEmpty(this.XamlSettings.TableCellRowBackgroundColor2))
                        this.XmlOutput.WriteAttributeString("Background", this.XamlSettings.TableCellRowBackgroundColor2);
                }
 
                this.XmlOutput.WriteAttributeString("Grid.Column", Column.ToString());
                this.XmlOutput.WriteAttributeString("Grid.Row", RowNr.ToString());
 
                if (ColSpan > 1)
                    this.XmlOutput.WriteAttributeString("Grid.ColumnSpan", ColSpan.ToString());
 
                if (E.InlineSpanElement)
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                    this.XmlOutput.WriteAttributeString("Padding", this.XamlSettings.TableCellPadding);
 
                    if (Bold)
                        this.XmlOutput.WriteAttributeString("FontWeight", "Bold");
 
                    if (this.Alignment != TextAlignment.Left)
                        this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
                }
                else
                {
                    this.XmlOutput.WriteStartElement("StackPanel");
                    this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.TableCellPadding);
                }
 
                await E.Render(this);
                this.XmlOutput.WriteEndElement();
                this.XmlOutput.WriteEndElement();
            }
 
            this.Alignment = Bak;
        }
 
        public override Task Render(TaskItem Element)
        {
            return this.RenderChild(Element);
        }
 
        public override async Task Render(TaskList Element)
        {
            int Row = 0;
            bool ParagraphBullet;
 
            this.XmlOutput.WriteStartElement("Grid");
            this.XmlOutput.WriteAttributeString("Margin", this.XamlSettings.ParagraphMargins);
            this.XmlOutput.WriteStartElement("Grid.ColumnDefinitions");
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "Auto");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteStartElement("ColumnDefinition");
            this.XmlOutput.WriteAttributeString("Width", "*");
            this.XmlOutput.WriteEndElement();
 
            this.XmlOutput.WriteEndElement();
            this.XmlOutput.WriteStartElement("Grid.RowDefinitions");
 
            foreach (MarkdownElement _ in Element.Children)
            {
                this.XmlOutput.WriteStartElement("RowDefinition");
                this.XmlOutput.WriteAttributeString("Height", "Auto");
                this.XmlOutput.WriteEndElement();
            }
 
            this.XmlOutput.WriteEndElement();
 
            foreach (MarkdownElement E in Element.Children)
            {
                ParagraphBullet = !E.InlineSpanElement || E.OutsideParagraph;
                this.GetMargins(E, out int TopMargin, out int BottomMargin);
 
                if (E is TaskItem TaskItem && TaskItem.IsChecked)
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                    this.XmlOutput.WriteAttributeString("Grid.Column", "0");
                    this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
                    if (this.Alignment != TextAlignment.Left)
                        this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                    this.XmlOutput.WriteAttributeString("Margin", "0," + TopMargin.ToString() + "," +
                        this.XamlSettings.ListContentMargin.ToString() + "," + BottomMargin.ToString());
 
                    this.XmlOutput.WriteValue("✓");
                    this.XmlOutput.WriteEndElement();
                }
 
                this.XmlOutput.WriteStartElement("StackPanel");
                this.XmlOutput.WriteAttributeString("Grid.Column", "1");
                this.XmlOutput.WriteAttributeString("Grid.Row", Row.ToString());
 
                if (ParagraphBullet)
                    await E.Render(this);
                else
                {
                    this.XmlOutput.WriteStartElement("TextBlock");
                    this.XmlOutput.WriteAttributeString("TextWrapping", "Wrap");
                    if (this.Alignment != TextAlignment.Left)
                        this.XmlOutput.WriteAttributeString("TextAlignment", this.Alignment.ToString());
 
                    await E.Render(this);
 
                    this.XmlOutput.WriteEndElement();
                }
 
                this.XmlOutput.WriteEndElement();
 
                Row++;
            }
 
            this.XmlOutput.WriteEndElement();
        }
 
        public override Task Render(UnnumberedItem Element)
        {
            return this.RenderChild(Element);
        }
 
        #endregion
 
    }
}