1 files changed, 147 insertions, 0 deletions
diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Gui/Markup/MarkupParser.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Gui/Markup/MarkupParser.cs
new file mode 100644
index 0000000..c2e8776
--- /dev/null
+++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Gui/Markup/MarkupParser.cs
@@ -0,0 +1,147 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Xml;
+using Microsoft.Xna.Framework;
+using MonoGame.Extended.Gui.Controls;
+
+namespace MonoGame.Extended.Gui.Markup
+{
+    public class MarkupParser
+    {
+        public MarkupParser()
+        {
+        }
+
+        private static readonly Dictionary<string, Type> _controlTypes =
+            typeof(Control).Assembly
+                .ExportedTypes
+                .Where(t => t.IsSubclassOf(typeof(Control)))
+                .ToDictionary(t => t.Name, StringComparer.OrdinalIgnoreCase);
+
+        private static readonly Dictionary<Type, Func<string, object>> _converters =
+            new Dictionary<Type, Func<string, object>>
+            {
+                {typeof(object), s => s},
+                {typeof(string), s => s},
+                {typeof(bool), s => bool.Parse(s)},
+                {typeof(int), s => int.Parse(s)},
+                {typeof(Color), s => s.StartsWith("#") ? ColorHelper.FromHex(s) : ColorHelper.FromName(s)}
+            };
+
+        private static object ConvertValue(Type propertyType, string input, object dataContext)
+        {
+            var value = ParseBinding(input, dataContext);
+
+            if (_converters.TryGetValue(propertyType, out var converter))
+                return converter(value); //property.SetValue(control, converter(value));
+
+            if (propertyType.IsEnum)
+                return
+                    Enum.Parse(propertyType, value,
+                        true); // property.SetValue(control, Enum.Parse(propertyType, value, true));
+
+            throw new InvalidOperationException($"Converter not found for {propertyType}");
+        }
+
+        private static object ParseChildNode(XmlNode node, Control parent, object dataContext)
+        {
+            if (node is XmlText)
+                return node.InnerText.Trim();
+
+            if (_controlTypes.TryGetValue(node.Name, out var type))
+            {
+                var typeInfo = type.GetTypeInfo();
+                var control = (Control) Activator.CreateInstance(type);
+
+                // ReSharper disable once AssignNullToNotNullAttribute
+                foreach (var attribute in node.Attributes.Cast<XmlAttribute>())
+                {
+                    var property = typeInfo.GetProperty(attribute.Name);
+
+                    if (property != null)
+                    {
+                        var value = ConvertValue(property.PropertyType, attribute.Value, dataContext);
+                        property.SetValue(control, value);
+                    }
+                    else
+                    {
+                        var parts = attribute.Name.Split('.');
+                        var parentType = parts[0];
+                        var propertyName = parts[1];
+                        var propertyType = parent.GetAttachedPropertyType(propertyName);
+                        var propertyValue = ConvertValue(propertyType, attribute.Value, dataContext);
+
+                        if (!string.Equals(parent.GetType().Name, parentType, StringComparison.OrdinalIgnoreCase))
+                            throw new InvalidOperationException(
+                                $"Attached properties are only supported on the immediate parent type {parentType}");
+
+                        control.SetAttachedProperty(propertyName, propertyValue);
+                    }
+                }
+
+
+                if (node.HasChildNodes)
+                {
+                    switch (control)
+                    {
+                        case ContentControl contentControl:
+                            if (node.ChildNodes.Count > 1)
+                                throw new InvalidOperationException("A content control can only have one child");
+
+                            contentControl.Content = ParseChildNode(node.ChildNodes[0], control, dataContext);
+                            break;
+                        case LayoutControl layoutControl:
+                            foreach (var childControl in ParseChildNodes(node.ChildNodes, control, dataContext))
+                                layoutControl.Items.Add(childControl as Control);
+                            break;
+                    }
+                }
+
+                return control;
+            }
+
+            throw new InvalidOperationException($"Unknown control type {node.Name}");
+        }
+
+        private static string ParseBinding(string expression, object dataContext)
+        {
+            if (dataContext != null && expression.StartsWith("{{") && expression.EndsWith("}}"))
+            {
+                var binding = expression.Substring(2, expression.Length - 4);
+                var bindingValue = dataContext
+                    .GetType()
+                    .GetProperty(binding)
+                    ?.GetValue(dataContext);
+
+                return $"{bindingValue}";
+            }
+
+            return expression;
+        }
+
+        private static IEnumerable<object> ParseChildNodes(XmlNodeList nodes, Control parent, object dataContext)
+        {
+            foreach (var node in nodes.Cast<XmlNode>())
+            {
+                if (node.Name == "xml")
+                {
+                    // TODO: Validate header
+                }
+                else
+                {
+                    yield return ParseChildNode(node, parent, dataContext);
+                }
+            }
+        }
+
+        public Control Parse(string filePath, object dataContext)
+        {
+            var d = new XmlDocument();
+            d.Load(filePath);
+            return ParseChildNodes(d.ChildNodes, null, dataContext)
+                .LastOrDefault() as Control;
+        }
+    }
+}