Some attributes compatibility for SVG files

FreeFrame.sln

@@ -5,7 +5,7 @@ VisualStudioVersion = 17.1.32228.430
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FreeFrame", "FreeFrame\FreeFrame.csproj", "{0B6F5913-5F9E-43E6-9C2B-6458771C0B64}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{7624DAC1-357B-4264-8501-F60942B4AD85}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FreeFrameTests", "FreeFrameTests\FreeFrameTests.csproj", "{C9665752-3F93-4FA8-8F2C-BF701D932E8A}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -17,6 +17,10 @@ Global
 		{0B6F5913-5F9E-43E6-9C2B-6458771C0B64}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0B6F5913-5F9E-43E6-9C2B-6458771C0B64}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0B6F5913-5F9E-43E6-9C2B-6458771C0B64}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C9665752-3F93-4FA8-8F2C-BF701D932E8A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C9665752-3F93-4FA8-8F2C-BF701D932E8A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C9665752-3F93-4FA8-8F2C-BF701D932E8A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C9665752-3F93-4FA8-8F2C-BF701D932E8A}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

FreeFrame/Components/Importer.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml;
+using FreeFrame.Components.Shapes;
+
+namespace FreeFrame.Components
+{
+    public static class Importer
+    {
+        static public void Import()
+        {
+            //TODO: find a solution for opening a crossplatform file dialog. Do I need a crossplatform dialog?
+            //using (OpenFileDialog openFileDialog = new OpenFileDialog())
+            //{
+            //}
+        }
+        static public List<Shape> ImportFromStream(Stream pStream)
+        {
+            List<Shape> shapes = new List<Shape>();
+
+            using (XmlReader reader = XmlReader.Create(pStream))
+            {
+                while (reader.Read())
+                {
+                    if (reader.HasAttributes)
+                    {
+                        //Console.WriteLine("Attributes of <" + reader.Name + ">");
+                        switch (reader.Name)
+                        {
+                            case "xml":
+                            case "svg":
+                                break; // Skip knowned elements
+                            case "polygon":
+                                shapes.Add(new SVGPolygon(reader));
+                                break;
+                            case "path":
+                                shapes.Add(new SVGPath(reader));
+                                break;
+                            case "rect":
+                                shapes.Add(new SVGRectangle(reader));
+                                break;
+                            case "circle":
+                                shapes.Add(new SVGCircle(reader));
+                                break;
+                            default:
+                                // TODO: show all the elemnt are not valid, be careful
+                                break;
+                        }
+                    }
+                }
+            }
+            return (shapes);
+        }
+        static public List<Shape> ImportFromFile(string pFilename)
+        {
+            if (!File.Exists(pFilename))
+                throw new ArgumentException($"'{pFilename}' file cannot be found.", nameof(pFilename)); // TODO: replace by a simple alert window
+
+            byte[] byteArray = Encoding.UTF8.GetBytes(File.ReadAllText(pFilename));
+
+            return ImportFromStream(new MemoryStream(byteArray));
+        }
+        static public List<Shape> ImportFromString(string pString)
+        {
+            byte[] byteArray = Encoding.UTF8.GetBytes(pString);
+
+            return ImportFromStream(new MemoryStream(byteArray));
+        }
+    }
+}