MarkdownToHtml.cs

using System.Threading.Tasks;
using Waher.Script;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Content.Markdown.Functions
{
    public class MarkdownToHtml : FunctionOneScalarVariable
    {
        public MarkdownToHtml(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(MarkdownToHtml);
 
        public override bool IsAsynchronous => true;
 
        public override IElement EvaluateScalar(string Argument, Variables Variables)
        {
            return this.EvaluateScalarAsync(Argument, Variables).Result;
        }
 
        public override async Task<IElement> EvaluateScalarAsync(string Argument, Variables Variables)
        {
            return new StringValue(await ToHtml(Argument, Variables));
        }
 
        public static  Task<string> ToHtml(string Markdown)
        {
            return ToHtml(Markdown, null);
        }
 
        public static async Task<string> ToHtml(string Markdown, Variables Variables)
        {
            MarkdownDocument Doc;
 
            Markdown = "BodyOnly: 1\r\n\r\n" + Markdown;
 
            if (Variables is null)
                Doc = await MarkdownDocument.CreateAsync(Markdown);
            else if (Variables.TryGetVariable(MarkdownDocument.MarkdownSettingsVariableName, out Variable v) &&
                v.ValueObject is MarkdownSettings Settings)
            {
                Doc = await MarkdownDocument.CreateAsync(Markdown, Settings);
            }
            else
            {
                Settings = new MarkdownSettings()
                {
                    Variables = Variables
                };
 
                Doc = await MarkdownDocument.CreateAsync(Markdown, Settings);
            }
 
            return await Doc.GenerateHTML();
        }
 
    }
}