ToonEncoder.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Waher.Content.Json;
using Waher.Runtime.Inventory;
using Waher.Script.Abstraction.Elements;
 
namespace Waher.Content.Toon
{
    public class ToonEncoder : IContentEncoder
    {
        public const string DefaultContentType = "text/toon";
 
        public const string DefaultFileExtension = "toon";
 
        public ToonEncoder()
        {
        }
 
        public static readonly string[] ToonContentTypes = new string[]
        {
            DefaultContentType
        };
 
        public static readonly string[] ToonFileExtensions = new string[]
        {
            DefaultFileExtension
        };
 
        public string[] ContentTypes => ToonContentTypes;
 
        public string[] FileExtensions => ToonFileExtensions;
 
        public bool TryGetContentType(string FileExtension, out string ContentType)
        {
            if (string.Compare(FileExtension, DefaultFileExtension, true) == 0)
            {
                ContentType = DefaultContentType;
                return true;
            }
            else
            {
                ContentType = null;
                return false;
            }
        }
 
        public bool TryGetFileExtension(string ContentType, out string FileExtension)
        {
            ContentType = ContentType.ToLower();
 
            if (Array.IndexOf(ToonContentTypes, ContentType) >= 0)
            {
                FileExtension = DefaultFileExtension;
                return true;
            }
            else
            {
                FileExtension = string.Empty;
                return false;
            }
        }
 
        public bool Encodes(object Object, out Grade Grade, params string[] AcceptedContentTypes)
        {
            if (InternetContent.IsAccepted(ToonContentTypes, AcceptedContentTypes))
            {
                if (Object is IEnumerable<KeyValuePair<string, object>>)
                {
                    Grade = Grade.Ok;
                    return true;
                }
                else if (Object is IJsonEncodingHint Hint)
                {
                    Grade = Hint.CanEncodeJson;
                    return Grade != Grade.NotAtAll;
                }
                else if (Object is null ||
                    Object is IEnumerable ||
                    Object is IVector ||
                    Object is string ||
                    Object is bool ||
                    Object is decimal ||
                    Object is double ||
                    Object is float ||
                    Object is int ||
                    Object is long ||
                    Object is short ||
                    Object is byte ||
                    Object is uint ||
                    Object is ulong ||
                    Object is ushort ||
                    Object is sbyte ||
                    Object is char)
                {
                    Grade = Grade.Barely;
                    return true;
                }
            }
 
            Grade = Grade.NotAtAll;
            return false;
        }
 
        public Task<ContentResponse> EncodeAsync(object Object, Encoding Encoding,
            ICodecProgress Progress, params string[] AcceptedContentTypes)
        {
            string Toon = TOON.Encode(Object, false);
 
            if (!InternetContent.IsAccepted(ToonContentTypes, out string ContentType,
                AcceptedContentTypes))
            {
                ContentType = DefaultContentType;
            }
 
            if (Encoding is null)
            {
                Encoding = Encoding.UTF8;
                ContentType += "; charset=utf-8";
            }
            else
                ContentType += "; charset=" + Encoding.WebName;
 
            return Task.FromResult(new ContentResponse(ContentType, Object, Encoding.GetBytes(Toon)));
        }
    }
}