EmoticonsTransformation.cs :  » Bloggers » SubText » Subtext » Framework » Emoticons » C# / CSharp Open Source

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#endregion

using System.Collections.Generic;
using System.Linq;
using Ninject;
using Subtext.Framework.Services;

namespace Subtext.Framework.Emoticons{
    /// <summary>
    /// Converts emoticons to img tags.
    /// </summary>
    public class EmoticonsTransformation : ITextTransformation
    {
        readonly ISubtextContext _subtextContext;

        string _appRootUrl;

        [Inject]
        public EmoticonsTransformation(ISubtextContext context)
            : this(new EmoticonsFileSource(context), null)
        {
            _subtextContext = context;
        }

        public EmoticonsTransformation(IEmoticonsSource emoticonsSource, string appRootUrl)
        {
            EmoticonsTable = emoticonsSource.GetEmoticons();
            _appRootUrl = appRootUrl;
        }

        protected IEnumerable<Emoticon> EmoticonsTable { get; private set; }

        public string Transform(string original)
        {
            if(_appRootUrl == null && _subtextContext != null && _subtextContext.UrlHelper != null)
            {
                //TODO: Temporary Hack.
                _appRootUrl = _subtextContext.UrlHelper.AppRoot();
            }
            return EmoticonsTable.Aggregate(original, (input, transform) => transform.Replace(input, _appRootUrl));
        }
    }
}