src/Tizen.NUI/src/internal/Xaml/CreateValuesVisitor.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Globalization;
   4 using System.Linq;
   5 using System.Reflection;
   6 using System.Xml;
   7 using Tizen.NUI.Binding.Internals;
   8 using Tizen.NUI.Binding;
   9
  10
  11 namespace Tizen.NUI.Xaml
  12 {
  13     internal class CreateValuesVisitor : IXamlNodeVisitor
  14     {
  15         public CreateValuesVisitor(HydrationContext context)
  16         {
  17             Context = context;
  18         }
  19
  20         Dictionary<INode, object> Values
  21         {
  22             get { return Context.Values; }
  23         }
  24
  25         HydrationContext Context { get; }
  26
  27         public TreeVisitingMode VisitingMode => TreeVisitingMode.BottomUp;
  28         public bool StopOnDataTemplate => true;
  29         public bool StopOnResourceDictionary => false;
  30         public bool VisitNodeOnDataTemplate => false;
  31         public bool SkipChildren(INode node, INode parentNode) => false;
  32
  33         public void Visit(ValueNode node, INode parentNode)
  34         {
  35             Values[node] = node.Value;
  36         }
  37
  38         public void Visit(MarkupNode node, INode parentNode)
  39         {
  40         }
  41
  42         public void Visit(ElementNode node, INode parentNode)
  43         {
  44             object value = null;
  45
  46             XamlParseException xpe;
  47             var type = XamlParser.GetElementType(node.XmlType, node, Context.RootElement?.GetType().GetTypeInfo().Assembly,
  48                 out xpe);
  49             if (xpe != null)
  50                 throw xpe;
  51
  52             Context.Types[node] = type;
  53             string ctorargname;
  54             if (IsXaml2009LanguagePrimitive(node))
  55                 value = CreateLanguagePrimitive(type, node);
  56             else if (node.Properties.ContainsKey(XmlName.xArguments) || node.Properties.ContainsKey(XmlName.xFactoryMethod))
  57                 value = CreateFromFactory(type, node);
  58             else if (
  59                 type.GetTypeInfo()
  60                     .DeclaredConstructors.Any(
  61                         ci =>
  62                             ci.IsPublic && ci.GetParameters().Length != 0 &&
  63                             ci.GetParameters().All(pi => pi.CustomAttributes.Any(attr => attr.AttributeType == typeof (ParameterAttribute)))) &&
  64                 ValidateCtorArguments(type, node, out ctorargname))
  65                 value = CreateFromParameterizedConstructor(type, node);
  66             else if (!type.GetTypeInfo().DeclaredConstructors.Any(ci => ci.IsPublic && ci.GetParameters().Length == 0) &&
  67                      !ValidateCtorArguments(type, node, out ctorargname))
  68             {
  69                 throw new XamlParseException($"The Property {ctorargname} is required to create a {type?.FullName} object.", node);
  70             }
  71             else
  72             {
  73                 //this is a trick as the DataTemplate parameterless ctor is internal, and we can't CreateInstance(..., false) on WP7
  74                 try
  75                 {
  76                     if (type == typeof (DataTemplate))
  77                         value = new DataTemplate();
  78                     if (type == typeof (ControlTemplate))
  79                         value = new ControlTemplate();
  80                     if (value == null && node.CollectionItems.Any() && node.CollectionItems.First() is ValueNode)
  81                     {
  82                         var serviceProvider = new XamlServiceProvider(node, Context);
  83                         var converted = ((ValueNode)node.CollectionItems.First()).Value.ConvertTo(type, () => type.GetTypeInfo(),
  84                             serviceProvider);
  85                         if (converted != null && converted.GetType() == type)
  86                             value = converted;
  87                     }
  88                     if (value == null)
  89                     {
  90                         value = Activator.CreateInstance(type);
  91                         if (value is BindableObject)
  92                         {
  93                             ((BindableObject)value).IsCreateByXaml = true;
  94                         }
  95                     }
  96                 }
  97                 catch (TargetInvocationException e)
  98                 {
  99                     if (e.InnerException is XamlParseException || e.InnerException is XmlException)
 100                         throw e.InnerException;
 101                     throw;
 102                 }
 103             }
 104
 105             Values[node] = value;
 106
 107             var markup = value as IMarkupExtension;
 108             if (markup != null && (value is TypeExtension || value is StaticExtension || value is ArrayExtension))
 109             {
 110                 var serviceProvider = new XamlServiceProvider(node, Context);
 111
 112                 var visitor = new ApplyPropertiesVisitor(Context);
 113                 foreach (var cnode in node.Properties.Values.ToList())
 114                     cnode.Accept(visitor, node);
 115                 foreach (var cnode in node.CollectionItems)
 116                     cnode.Accept(visitor, node);
 117
 118                 value = markup.ProvideValue(serviceProvider);
 119
 120                 INode xKey;
 121                 if (!node.Properties.TryGetValue(XmlName.xKey, out xKey))
 122                     xKey = null;
 123
 124                 node.Properties.Clear();
 125                 node.CollectionItems.Clear();
 126
 127                 if (xKey != null)
 128                     node.Properties.Add(XmlName.xKey, xKey);
 129
 130                 Values[node] = value;
 131             }
 132
 133             if (value is BindableObject)
 134                 NameScope.SetNameScope(value as BindableObject, node.Namescope);
 135         }
 136
 137         public void Visit(RootNode node, INode parentNode)
 138         {
 139             var rnode = (XamlLoader.RuntimeRootNode)node;
 140             Values[node] = rnode.Root;
 141             Context.Types[node] = rnode.Root.GetType();
 142             var bindableRoot = rnode.Root as BindableObject;
 143             if (bindableRoot != null)
 144                 NameScope.SetNameScope(bindableRoot, node.Namescope);
 145         }
 146
 147         public void Visit(ListNode node, INode parentNode)
 148         {
 149             //this is a gross hack to keep ListNode alive. ListNode must go in favor of Properties
 150             XmlName name;
 151             if (ApplyPropertiesVisitor.TryGetPropertyName(node, parentNode, out name))
 152                 node.XmlName = name;
 153         }
 154
 155         bool ValidateCtorArguments(Type nodeType, IElementNode node, out string missingArgName)
 156         {
 157             missingArgName = null;
 158             var ctorInfo =
 159                 nodeType.GetTypeInfo()
 160                     .DeclaredConstructors.FirstOrDefault(
 161                         ci =>
 162                             ci.GetParameters().Length != 0 && ci.IsPublic &&
 163                             ci.GetParameters().All(pi => pi.CustomAttributes.Any(attr => attr.AttributeType == typeof (ParameterAttribute))));
 164             if (ctorInfo == null)
 165                 return true;
 166             foreach (var parameter in ctorInfo.GetParameters())
 167             {
 168                 // Modify the namespace
 169                 var propname =
 170                     parameter.CustomAttributes.First(ca => ca.AttributeType.FullName == "Tizen.NUI.Binding.ParameterAttribute")
 171                         .ConstructorArguments.First()
 172                         .Value as string;
 173                 if (!node.Properties.ContainsKey(new XmlName("", propname)))
 174                 {
 175                     missingArgName = propname;
 176                     return false;
 177                 }
 178             }
 179
 180             return true;
 181         }
 182
 183         public object CreateFromParameterizedConstructor(Type nodeType, IElementNode node)
 184         {
 185             var ctorInfo =
 186                 nodeType.GetTypeInfo()
 187                     .DeclaredConstructors.FirstOrDefault(
 188                         ci =>
 189                             ci.GetParameters().Length != 0 && ci.IsPublic &&
 190                             ci.GetParameters().All(pi => pi.CustomAttributes.Any(attr => attr.AttributeType == typeof (ParameterAttribute))));
 191             object[] arguments = CreateArgumentsArray(node, ctorInfo);
 192             return ctorInfo.Invoke(arguments);
 193         }
 194
 195         public object CreateFromFactory(Type nodeType, IElementNode node)
 196         {
 197             object[] arguments = CreateArgumentsArray(node);
 198
 199             if (!node.Properties.ContainsKey(XmlName.xFactoryMethod))
 200             {
 201                 //non-default ctor
 202                 object ret = Activator.CreateInstance(nodeType, arguments);
 203                 if (ret is BindableObject)
 204                 {
 205                     ((BindableObject)ret).IsCreateByXaml = true;
 206                 }
 207                 return ret;
 208             }
 209
 210             var factoryMethod = ((string)((ValueNode)node.Properties[XmlName.xFactoryMethod]).Value);
 211             Type[] types = arguments == null ? new Type[0] : arguments.Select(a => a.GetType()).ToArray();
 212             Func<MethodInfo, bool> isMatch = m => {
 213                 if (m.Name != factoryMethod)
 214                     return false;
 215                 var p = m.GetParameters();
 216                 if (p.Length != types.Length)
 217                     return false;
 218                 if (!m.IsStatic)
 219                     return false;
 220                 for (var i = 0; i < p.Length; i++) {
 221                     if ((p [i].ParameterType.IsAssignableFrom(types [i])))
 222                         continue;
 223                     var op_impl =  p[i].ParameterType.GetImplicitConversionOperator(fromType: types[i], toType: p[i].ParameterType)
 224                                 ?? types[i].GetImplicitConversionOperator(fromType: types[i], toType: p[i].ParameterType);
 225
 226                     if (op_impl == null)
 227                         return false;
 228                     arguments [i] = op_impl.Invoke(null, new [] { arguments [i]});
 229                 }
 230                 return true;
 231             };
 232             var mi = nodeType.GetRuntimeMethods().FirstOrDefault(isMatch);
 233             if (mi == null)
 234                 throw new MissingMemberException($"No static method found for {nodeType.FullName}::{factoryMethod} ({string.Join(", ", types.Select(t => t.FullName))})");
 235             return mi.Invoke(null, arguments);
 236         }
 237
 238         public object[] CreateArgumentsArray(IElementNode enode)
 239         {
 240             if (!enode.Properties.ContainsKey(XmlName.xArguments))
 241                 return null;
 242             var node = enode.Properties[XmlName.xArguments];
 243             var elementNode = node as ElementNode;
 244             if (elementNode != null)
 245             {
 246                 var array = new object[1];
 247                 array[0] = Values[elementNode];
 248                 return array;
 249             }
 250
 251             var listnode = node as ListNode;
 252             if (listnode != null)
 253             {
 254                 var array = new object[listnode.CollectionItems.Count];
 255                 for (var i = 0; i < listnode.CollectionItems.Count; i++)
 256                     array[i] = Values[(ElementNode)listnode.CollectionItems[i]];
 257                 return array;
 258             }
 259             return null;
 260         }
 261
 262         public object[] CreateArgumentsArray(IElementNode enode, ConstructorInfo ctorInfo)
 263         {
 264             var n = ctorInfo.GetParameters().Length;
 265             var array = new object[n];
 266             for (var i = 0; i < n; i++)
 267             {
 268                 var parameter = ctorInfo.GetParameters()[i];
 269                 var propname =
 270                     parameter.CustomAttributes.First(attr => attr.AttributeType == typeof (ParameterAttribute))
 271                         .ConstructorArguments.First()
 272                         .Value as string;
 273                 var name = new XmlName("", propname);
 274                 INode node;
 275                 if (!enode.Properties.TryGetValue(name, out node))
 276                 {
 277                     throw new XamlParseException(
 278                         String.Format("The Property {0} is required to create a {1} object.", propname, ctorInfo.DeclaringType.FullName),
 279                         enode as IXmlLineInfo);
 280                 }
 281                 if (!enode.SkipProperties.Contains(name))
 282                     enode.SkipProperties.Add(name);
 283                 var value = Context.Values[node];
 284                 var serviceProvider = new XamlServiceProvider(enode, Context);
 285                 var convertedValue = value.ConvertTo(parameter.ParameterType, () => parameter, serviceProvider);
 286                 array[i] = convertedValue;
 287             }
 288
 289             return array;
 290         }
 291
 292         static bool IsXaml2009LanguagePrimitive(IElementNode node)
 293         {
 294             return node.NamespaceURI == XamlParser.X2009Uri;
 295         }
 296
 297         static object CreateLanguagePrimitive(Type nodeType, IElementNode node)
 298         {
 299             object value = null;
 300             if (nodeType == typeof(string))
 301                 value = String.Empty;
 302             else if (nodeType == typeof(Uri))
 303                 value = null;
 304             else
 305             {
 306                 value = Activator.CreateInstance(nodeType);
 307                 if (value is BindableObject)
 308                 {
 309                     ((BindableObject)value).IsCreateByXaml = true;
 310                 }
 311             }
 312
 313             if (node.CollectionItems.Count == 1 && node.CollectionItems[0] is ValueNode &&
 314                 ((ValueNode)node.CollectionItems[0]).Value is string)
 315             {
 316                 var valuestring = ((ValueNode)node.CollectionItems[0]).Value as string;
 317
 318                 if (nodeType == typeof(SByte)) {
 319                     sbyte retval;
 320                     if (sbyte.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 321                         return retval;
 322                 }
 323                 if (nodeType == typeof(Int16)) {
 324                     short retval;
 325                     if (short.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 326                         return retval;
 327                 }
 328                 if (nodeType == typeof(Int32)) {
 329                     int retval;
 330                     if (int.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 331                         return retval;
 332                 }
 333                 if (nodeType == typeof(Int64)) {
 334                     long retval;
 335                     if (long.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 336                         return retval;
 337                 }
 338                 if (nodeType == typeof(Byte)) {
 339                     byte retval;
 340                     if (byte.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 341                         return retval;
 342                 }
 343                 if (nodeType == typeof(UInt16)) {
 344                     ushort retval;
 345                     if (ushort.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 346                         return retval;
 347                 }
 348                 if (nodeType == typeof(UInt32)) {
 349                     uint retval;
 350                     if (uint.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 351                         return retval;
 352                 }
 353                 if (nodeType == typeof(UInt64)) {
 354                     ulong retval;
 355                     if (ulong.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 356                         return retval;
 357                 }
 358                 if (nodeType == typeof(Single)) {
 359                     float retval;
 360                     if (float.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 361                         return retval;
 362                 }
 363                 if (nodeType == typeof(Double)) {
 364                     double retval;
 365                     if (double.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 366                         return retval;
 367                 }
 368                 if (nodeType == typeof (Boolean))
 369                 {
 370                     bool outbool;
 371                     if (bool.TryParse(valuestring, out outbool))
 372                         return outbool;
 373                 }
 374                 if (nodeType == typeof(TimeSpan)) {
 375                     TimeSpan retval;
 376                     if (TimeSpan.TryParse(valuestring, CultureInfo.InvariantCulture, out retval))
 377                         return retval;
 378                 }
 379                 if (nodeType == typeof (char))
 380                 {
 381                     char retval;
 382                     if (char.TryParse(valuestring, out retval))
 383                         return retval;
 384                 }
 385                 if (nodeType == typeof (string))
 386                     return valuestring;
 387                 if (nodeType == typeof (decimal))
 388                 {
 389                     decimal retval;
 390                     if (decimal.TryParse(valuestring, NumberStyles.Number, CultureInfo.InvariantCulture, out retval))
 391                         return retval;
 392                 }
 393
 394                 else if (nodeType == typeof (Uri))
 395                 {
 396                     Uri retval;
 397                     if (Uri.TryCreate(valuestring, UriKind.RelativeOrAbsolute, out retval))
 398                         return retval;
 399                 }
 400             }
 401             return value;
 402         }
 403     }
 404 }