mRemoteNG/mRemoteV1/Themes/ThemeSerializer.cs

using System.Collections.Generic;
using System;
using System.Drawing;
using System.IO;
using System.Xml;


namespace mRemoteNG.Themes
{
	public class ThemeSerializer
	{
		public static void SaveToXmlFile(ThemeInfo themeInfo, string filename)
		{
		    var themeList = new List<ThemeInfo> {themeInfo};
		    SaveToXmlFile(themeList, filename);
		}
			
		public static void SaveToXmlFile(List<ThemeInfo> themes, string filename)
		{
			var tempFileName = Path.GetTempFileName();
		    var xmlTextWriter = new XmlTextWriter(tempFileName, System.Text.Encoding.UTF8)
		    {
		        Formatting = Formatting.Indented,
		        Indentation = 4
		    };


		    xmlTextWriter.WriteStartDocument();
				
			xmlTextWriter.WriteStartElement("mRemoteNG");
				
			xmlTextWriter.WriteStartElement("FileInfo");
			xmlTextWriter.WriteAttributeString("Version", "1.0");
			xmlTextWriter.WriteElementString("FileType", "Theme");
			xmlTextWriter.WriteElementString("FileTypeVersion", "1.0");
			xmlTextWriter.WriteEndElement(); // FileInfo
				
			var themeType = (new ThemeInfo()).GetType();
			var colorType = (new Color()).GetType();
		    foreach (var themeInfo in themes)
			{
				xmlTextWriter.WriteStartElement("Theme");
				xmlTextWriter.WriteAttributeString("Name", themeInfo.Name);
					
				foreach (var propertyInfo in themeType.GetProperties())
				{
					if (!(propertyInfo.PropertyType == colorType))
					{
						continue;
					}
					var color = (Color)propertyInfo.GetValue(themeInfo, null);
					xmlTextWriter.WriteStartElement("Color");
					xmlTextWriter.WriteAttributeString("Name", propertyInfo.Name);
					xmlTextWriter.WriteAttributeString("Value", EncodeColorName(color));
					xmlTextWriter.WriteEndElement(); // Color
				}
					
				xmlTextWriter.WriteEndElement(); // Theme
			}
				
			xmlTextWriter.WriteEndElement(); // mRemoteNG
				
			xmlTextWriter.Close();
				
			File.Delete(filename);
			File.Move(tempFileName, filename);
		}
			
		public static List<ThemeInfo> LoadFromXmlFile(string filename)
		{
			var xmlDocument = new XmlDocument();
			xmlDocument.Load(filename);
				
			var fileInfoNode = xmlDocument.SelectSingleNode("/mRemoteNG/FileInfo");
			var fileInfoVersion = new Version(fileInfoNode.Attributes["Version"].Value);
			if (fileInfoVersion > new Version(1, 0))
			{
				throw (new FileFormatException($"Unsupported FileInfo version ({fileInfoVersion})."));
			}
				
			var fileTypeNode = fileInfoNode.SelectSingleNode("./FileType");
			var fileType = fileTypeNode.InnerText;
			if (fileType != "Theme")
			{
				throw (new FileFormatException($"Incorrect FileType ({fileType}). Expected \"Theme\"."));
			}
				
			var fileTypeVersion = new Version(fileInfoNode.SelectSingleNode("./FileTypeVersion").InnerText);
			if (fileTypeVersion > new Version(1, 0))
			{
				throw (new FileFormatException($"Unsupported FileTypeVersion ({fileTypeVersion})."));
			}
				
			var themeNodes = xmlDocument.SelectNodes("/mRemoteNG/Theme");
			var themes = new List<ThemeInfo>();
		    var themeType = (new ThemeInfo()).GetType();
			var colorType = (new Color()).GetType();
		    foreach (XmlNode themeNode in themeNodes)
			{
			    var themeInfo = new ThemeInfo {Name = themeNode.Attributes?["Name"].Value};
			    foreach (XmlNode colorNode in themeNode.SelectNodes("./Color"))
				{
					var colorName = colorNode.Attributes?["Name"].Value;
					var colorValue = colorNode.Attributes?["Value"].Value;
					var propertyInfo = themeType.GetProperty(colorName);
					if (propertyInfo == null || !(propertyInfo.PropertyType == colorType))
					{
						continue;
					}
					propertyInfo.SetValue(themeInfo, DecodeColorName(colorValue), null);
				}
				themes.Add(themeInfo);
			}
				
			return themes;
		}
			
		private static string EncodeColorName(Color color)
		{
            // best/simplest answer to converting to hex: http://stackoverflow.com/questions/12078942/how-to-convert-from-argb-to-hex-aarrggbb
            return color.IsNamedColor ? color.Name : $"{color.A:X2}{color.R:X2}{color.G:X2}{color.B:X2}";
		}

	    private static Color DecodeColorName(string name)
	    {
	        var regex = new System.Text.RegularExpressions.Regex("^[0-9a-fA-F]{8}$");
	        return regex.Match(name).Success ? Color.FromArgb(Convert.ToInt32(name, 16)) : Color.FromName(name);
	    }
	}
}