IEnumerable <XamlNodeInfo> GetDeferredNodes(XamlMember xm, object val)
{
var node = new XamlNodeInfo();
var reader = xm.DeferringLoader.ConverterInstance.Save(val, value_serializer_ctx);
var xobj = new XamlObject();
while (reader.Read())
{
var nodeType = reader.NodeType;
switch (nodeType)
{
case XamlNodeType.StartObject:
case XamlNodeType.GetObject:
xobj.Set(reader.Type, reader.Value);
yield return(node.Set(nodeType, xobj));
break;
case XamlNodeType.EndObject:
yield return(XamlNodeInfo.EndObject);
break;
case XamlNodeType.StartMember:
yield return(node.Set(nodeType, reader.Member));
break;
case XamlNodeType.EndMember:
yield return(XamlNodeInfo.EndMember);
break;
case XamlNodeType.Value:
yield return(node.Set(reader.Value));
break;
case XamlNodeType.NamespaceDeclaration:
yield return(node.Set(reader.Namespace));
break;
default:
break;
}
}
}
IEnumerable <XamlNodeInfo> GetNodes(XamlMember xm, XamlObject xobj, XamlType overrideMemberType = null, bool partOfPositionalParameters = false, XamlNodeInfo node = null)
{
object val;
// Value - only for non-top-level node (thus xm != null)
if (xm != null)
{
// collection items: each item is exposed as a standalone object that has StartObject, EndObject and contents.
if (ReferenceEquals(xm, XamlLanguage.Items))
{
foreach (var xn in GetItemsNodes(xm, xobj))
{
yield return(xn);
}
yield break;
}
// Arguments: each argument is written as a standalone object
if (ReferenceEquals(xm, XamlLanguage.Arguments))
{
var xarg = new XamlObject();
foreach (var argm in xobj.Type.GetSortedConstructorArguments())
{
var argv = argm.Invoker.GetValue(xobj.Value);
xarg.Set(argm.Type, argv);
foreach (var cn in GetNodes(null, xarg))
{
yield return(cn);
}
}
yield break;
}
// PositionalParameters: items are from constructor arguments, written as Value node sequentially. Note that not all of them are in simple string value. Also, null values are not written as NullExtension
if (ReferenceEquals(xm, XamlLanguage.PositionalParameters))
{
var xarg = new XamlObject();
foreach (var argm in xobj.Type.GetSortedConstructorArguments())
{
foreach (var cn in GetNodes(argm, xarg.Set(argm.Type, xobj.GetMemberValue(argm)), null, true))
{
yield return(cn);
}
}
yield break;
}
node = node ?? new XamlNodeInfo();
if (ReferenceEquals(xm, XamlLanguage.Initialization))
{
yield return(node.Set(TypeExtensionMethods.GetStringValue(xobj.Type, xm, xobj.Value, value_serializer_ctx)));
yield break;
}
val = xobj.Value;
if (xm.DeferringLoader != null)
{
foreach (var xn in GetDeferredNodes(xm, val))
{
yield return(xn);
}
yield break;
}
// don't serialize default values if one is explicitly specified using the DefaultValueAttribute
if (!partOfPositionalParameters)
{
if (xm.Invoker.IsDefaultValue(val))
{
yield break;
}
if (settings.IgnoreDefaultValues && xm.DefaultValue == null)
{
if (xm.Type?.UnderlyingType?.GetTypeInfo().IsValueType == true)
{
if (Equals(val, Activator.CreateInstance(xm.Type.UnderlyingType)))
{
yield break;
}
}
else if (ReferenceEquals(val, null))
{
yield break;
}
}
}
// overrideMemberType is (so far) used for XamlLanguage.Key.
var xtt = overrideMemberType ?? xm.Type;
if (!xtt.IsMarkupExtension && // this condition is to not serialize MarkupExtension whose type has TypeConverterAttribute (e.g. StaticExtension) as a string.
(xtt.IsContentValue(value_serializer_ctx) || xm.IsContentValue(value_serializer_ctx)))
{
// though null value is special: it is written as a standalone object.
if (val == null)
{
if (!partOfPositionalParameters)
{
foreach (var xn in GetNodes(null, null_object, node: node))
{
yield return(xn);
}
}
else
{
yield return(node.Set(String.Empty));
}
}
else if (!NameResolver.IsCollectingReferences) // for perf, getting string value can be expensive
{
yield return(node.Set(TypeExtensionMethods.GetStringValue(xtt, xm, val, value_serializer_ctx)));
}
else if (val is Type)
{
LookupType((Type)val);
}
//new XamlTypeName(xtt.SchemaContext.GetXamlType((Type)val)).ToString(value_serializer_ctx?.GetService(typeof(INamespacePrefixLookup)) as INamespacePrefixLookup);
yield break;
}
// collection items: return GetObject and Items.
if ((xm.Type.IsCollection || xm.Type.IsDictionary) && !xm.IsWritePublic)
{
yield return(XamlNodeInfo.GetObject);
// Write Items member only when there are items (i.e. do not write it if it is empty).
var itemsValue = xobj.GetMemberObjectValue(XamlLanguage.Items);
var en = GetItemsNodes(XamlLanguage.Items, itemsValue).GetEnumerator();
if (en.MoveNext())
{
yield return(node.Set(XamlNodeType.StartMember, XamlLanguage.Items));
do
{
yield return(en.Current);
} while (en.MoveNext());
yield return(XamlNodeInfo.EndMember);
}
yield return(XamlNodeInfo.EndObject);
yield break;
}
if (xm.Type.IsXData)
{
var sw = new StringWriter();
var xw = XmlWriter.Create(sw, new XmlWriterSettings {
OmitXmlDeclaration = true, ConformanceLevel = ConformanceLevel.Auto
});
#if NETSTANDARD1_0
if (!ReflectionHelpers.IXmlSerializableType?.GetTypeInfo().IsAssignableFrom(val?.GetType().GetTypeInfo()) ?? false)
{
yield break; // do not output anything
}
ReflectionHelpers.IXmlSerializableWriteXmlMethod?.Invoke(val, new object[] { xw });
#else
var val3 = val as IXmlSerializable;
if (val3 == null)
{
yield break; // do not output anything
}
val3.WriteXml(xw);
#endif
xw.Dispose();
var obj = new XData {
Text = sw.ToString()
};
foreach (var xn in GetNodes(null, new XamlObject(XamlLanguage.XData, obj), node: node))
{
yield return(xn);
}
yield break;
}
}
else
{
node = node ?? new XamlNodeInfo();
val = xobj.Value;
}
// Object - could become Reference
if (val != null && !ReferenceEquals(xobj.Type, XamlLanguage.Reference))
{
if (xm != null && !xm.IsReadOnly && !IsPublicOrVisible(val.GetType()))
{
throw new XamlObjectReaderException($"Cannot read from internal type {xobj.Type}");
}
if (!xobj.Type.IsContentValue(value_serializer_ctx))
{
string refName = NameResolver.GetReferenceName(xobj, val);
if (refName != null)
{
// The target object is already retrieved, so we don't return the same object again.
NameResolver.SaveAsReferenced(val); // Record it as named object.
// Then return Reference object instead.
var xref = new XamlObject(XamlLanguage.Reference, new Reference(refName));
yield return(node.Set(XamlNodeType.StartObject, xref));
yield return(node.Set(XamlNodeType.StartMember, XamlLanguage.PositionalParameters));
yield return(node.Set(refName));
yield return(XamlNodeInfo.EndMember);
yield return(XamlNodeInfo.EndObject);
yield break;
}
else
{
// The object appeared in the xaml tree for the first time. So we store the reference with a unique name so that it could be referenced later.
NameResolver.SetNamedObject(val, true); // probably fullyInitialized is always true here.
}
}
yield return(node.Set(XamlNodeType.StartObject, xobj));
// If this object is referenced and there is no [RuntimeNameProperty] member, then return Name property in addition.
if (!NameResolver.IsCollectingReferences && xobj.Type.GetAliasedProperty(XamlLanguage.Name) == null)
{
string name = NameResolver.GetReferencedName(xobj, val);
if (name != null)
{
yield return(node.Set(XamlNodeType.StartMember, XamlLanguage.Name));
yield return(node.Set(name));
yield return(XamlNodeInfo.EndMember);
}
}
}
else
{
yield return(node.Set(XamlNodeType.StartObject, xobj));
}
// get all object member nodes
var xce = GetNodeMembers(xobj, value_serializer_ctx).GetEnumerator();
var xobject = new XamlObject();
var startNode = new XamlNodeInfo();
while (xce.MoveNext())
{
var xnm = xce.Current;
var en = GetNodes(xnm.Member, xnm.GetValue(xobject), node: node).GetEnumerator();
if (en.MoveNext())
{
if (!xnm.Member.IsWritePublic && xnm.Member.Type != null && (xnm.Member.Type.IsCollection || xnm.Member.Type.IsDictionary))
{
// if we are a collection or dictionary without a setter, check to see if its empty first
var node1 = en.Current.Copy(); // getObject
if (!en.MoveNext())
{
continue;
}
var node2 = en.Current.Copy(); // possibly endObject
if (!en.MoveNext()) // we have one more, so it's not empty!
{
continue;
}
// if we have three nodes, then it isn't empty
yield return(startNode.Set(XamlNodeType.StartMember, xnm.Member));
yield return(node1);
yield return(node2);
}
else
{
yield return(startNode.Set(XamlNodeType.StartMember, xnm.Member));
}
do
{
yield return(en.Current);
} while (en.MoveNext());
yield return(XamlNodeInfo.EndMember);
}
}
yield return(XamlNodeInfo.EndObject);
}
