MarkdownEncode.cs

using System;
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 MarkdownEncode : FunctionOneScalarStringVariable
    {
        public MarkdownEncode(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(MarkdownEncode);
 
        public override IElement EvaluateScalar(string Argument, Variables Variables)
        {
            return new StringValue(EscapeText(Argument));
        }
 
        public override IElement EvaluateScalar(IElement Argument, Variables Variables)
        {
            return new StringValue(EscapeText(Argument.AssociatedObjectValue?.ToString() ?? string.Empty));
        }
 
        public override Task<IElement> EvaluateScalarAsync(IElement Argument, Variables Variables)
        {
            return Task.FromResult(this.EvaluateScalar(Argument, Variables));
        }
 
        public static string EscapeText(string PlainText)
        {
            return CommonTypes.Escape(PlainText, specialCharacters, specialCharactersEncoded);
        }
 
        private static readonly char[] specialCharacters = new char[]
        {
            '*', '_', '~', '\\', '`', '{', '}', '[', ']', '(', ')', '<', '>', '&', '#', '+', '-', '.', '!', '"', '\'', '^', '%', '=', ':', '|'
        };
 
        private static readonly string[] specialCharactersEncoded = new string[]
        {
            "\\*", "\\_", "\\~", "\\\\", "\\`", "\\{", "\\}", "\\[", "\\]", "\\(", "\\)", "\\<", "\\>", "\\&",
            "\\#", "\\+", "\\-", "\\.", "\\!", "\\\"", "\\'", "\\^", "\\%", "\\=", "\\:", "&#124;"
        };
 
    }
}