EmbeddedPdfDocument.cs

using System.Text;
using System.Threading.Tasks;
using Waher.Content;
using Waher.Content.Markdown;
using Waher.Content.Markdown.Model;
using Waher.Content.Markdown.Rendering;
using Waher.Content.Xml;
using Waher.Runtime.Collections;
using Waher.Runtime.Inventory;
 
namespace Waher.IoTGateway.CodeContent
{
    public class EmbeddedPdfDocument : MultimediaContent, ICodeContent, ICodeContentHtmlRenderer,
        IMultimediaHtmlRenderer
    {
        private MarkdownDocument document;
 
        public EmbeddedPdfDocument()
        {
        }
 
        public Grade Supports(string Language)
        {
            int i = Language.IndexOf(':');
            if (i > 0)
                Language = Language[..i].TrimEnd();
 
            if (string.Compare(Language, "application/pdf", true) == 0)
                return Grade.Ok;
            else
                return Grade.NotAtAll;
        }
 
        public override Grade Supports(MultimediaItem Item)
        {
            if (Item.ContentType.StartsWith("application/pdf") || Item.Url.EndsWith(".pdf"))
                return Grade.Ok;
            else
                return Grade.NotAtAll;
        }
 
        public override bool EmbedInlineLink(string Url)
        {
            return true;
        }
 
        public bool EvaluatesScript => false;
 
        public void Register(MarkdownDocument Document)
        {
            this.document = Document;
        }
 
        public Task<bool> RenderHtml(HtmlRenderer Renderer, string[] Rows, string Language, int Indent, MarkdownDocument Document)
        {
            int i = Language.IndexOf(':');
 
            StringBuilder Output = Renderer.Output;
 
            Output.Append("<embed type=\"application/pdf\"");
            Output.Append(" style=\"margin-bottom:1em;width:100%;height:75vh;\"");
 
            if (i > 0)
            {
                Output.Append(" title=\"");
                Output.Append(XML.HtmlValueEncode(Language[(i + 1)..].Trim()));
                Output.Append('"');
            }
 
            Output.Append(" src=\"data:application/pdf;base64,");
 
            foreach (string Row in Rows)
                Output.Append(Row.Trim());
 
            Output.AppendLine("\"/>");
 
            return Task.FromResult(true);
        }
        public Task RenderHtml(HtmlRenderer Renderer, MultimediaItem[] Items, ChunkedList<MarkdownElement> ChildNodes, bool AloneInParagraph,
            MarkdownDocument Document)
        {
            StringBuilder Output = Renderer.Output;
 
            Output.Append("<embed type=\"application/pdf\"");
            Output.Append(" style=\"margin-bottom:1em;width:100%;height:75vh;\"");
            Output.Append(" src=\"");
 
            foreach (MultimediaItem Item in Items)
            {
                Output.Append(XML.HtmlAttributeEncode(Document.CheckURL(Item.Url, null)));
                break;
            }
 
            Output.AppendLine("\">");
 
            if (AloneInParagraph)
                Output.AppendLine();
 
            return Task.CompletedTask;
        }
 
        public Task Preload(ICodecProgress Progress, MultimediaItem[] Items)
        {
            return Task.CompletedTask;
        }
 
    }
}