public IXamlAstNode Transform(AstTransformationContext context, IXamlAstNode node)
{
if (node is XamlAstObjectNode ni)
{
XamlAstXamlPropertyValueNode propertyNode = null;
for (var c = ni.Children.Count - 1; c >= 0; c--)
{
var child = ni.Children[c];
if (child is IXamlAstValueNode valueNode)
{
if (propertyNode == null)
{
var contentProperty = context.Configuration.FindContentProperty(ni.Type.GetClrType());
if (contentProperty != null)
{
propertyNode = new XamlAstXamlPropertyValueNode(ni,
new XamlAstClrProperty(ni, contentProperty, context.Configuration),
Array.Empty <IXamlAstValueNode>());
}
else
{
var adders = XamlTransformHelpers.FindPossibleAdders(context, ni.Type.GetClrType());
if (adders.Count == 0)
{
// If there's no content property, strip all whitespace-only nodes and continue
WhitespaceNormalization.RemoveWhitespaceNodes(ni.Children);
if (!ni.Children.Contains(child))
{
continue;
}
throw new XamlParseException(
$"No Content property or any Add methods found for type {ni.Type.GetClrType().GetFqn()}",
child);
}
propertyNode = new XamlAstXamlPropertyValueNode(ni, new XamlAstClrProperty(ni,
"Content", ni.Type.GetClrType(), null,
adders.Select(a => new XamlDirectCallPropertySetter(a)
{
BinderParameters = { AllowMultiple = true }
})),
Array.Empty <IXamlAstValueNode>());
}
}
// We are going in reverse order, so insert at the beginning
propertyNode.Values.Insert(0, valueNode);
ni.Children.RemoveAt(c);
}
}
if (propertyNode != null)
{
ni.Children.Add(propertyNode);
}
}
return(node);
}
public IXamlAstNode Transform(AstTransformationContext context, IXamlAstNode node)
{
if (node is XamlAstXamlPropertyValueNode propertyNode)
{
var childNodes = propertyNode.Values;
WhitespaceNormalization.Apply(
childNodes,
context.Configuration
);
var property = propertyNode.Property.GetClrProperty();
if (!WantsWhitespaceOnlyElements(context.Configuration, property))
{
WhitespaceNormalization.RemoveWhitespaceNodes(childNodes);
}
}
return(node);
}
public IXamlAstNode Transform(AstTransformationContext context, IXamlAstNode node)
{
if (node is XamlAstObjectNode ni)
{
var argDirectives = ni.Children.OfType <XamlAstObjectNode>()
.Where(d => d.Type is XamlAstXmlTypeReference xref &&
xref.XmlNamespace == XamlNamespaces.Xaml2006 && xref.Name == "Arguments").ToList();
if (argDirectives.Count > 1 && context.StrictMode)
{
throw new XamlParseException("x:Arguments directive is specified more than once",
argDirectives[1]);
}
if (argDirectives.Count == 0)
{
return(node);
}
ni.Arguments = argDirectives[0].Children.OfType <IXamlAstValueNode>().ToList();
ni.Children.Remove(argDirectives[0]);
// This is needed to remove whitespace-only nodes between actual object elements or text nodes
WhitespaceNormalization.RemoveWhitespaceNodes(ni.Arguments);
}
return(node);
}
public IXamlAstNode Transform(AstTransformationContext context, IXamlAstNode node)
{
if (node is XamlAstXamlPropertyValueNode valueNode)
{
var property = valueNode.Property.GetClrProperty();
var assignments = new List <XamlPropertyAssignmentNode>();
WhitespaceNormalization.RemoveWhitespaceNodes(valueNode.Values);
foreach (var v in valueNode.Values)
{
var keyNode = FindAndRemoveKey(v);
var arguments = new List <IXamlAstValueNode>();
if (keyNode != null)
{
arguments.Add(keyNode);
}
arguments.Add(v);
// Pre-filter setters by non-last argument
var filteredSetters = property.Setters.Where(s => s.Parameters.Count == arguments.Count)
.ToList();
if (arguments.Count > 1)
{
for (var c = 0; c < arguments.Count - 1; c++)
{
IXamlType convertedTo = null;
for (var s = 0; s < filteredSetters.Count;)
{
var setter = filteredSetters[s];
if (convertedTo == null)
{
if (!XamlTransformHelpers.TryGetCorrectlyTypedValue(context, arguments[c],
setter.Parameters[c], out var converted))
{
filteredSetters.RemoveAt(c);
continue;
}
else
{
convertedTo = converted.Type.GetClrType();
arguments[c] = converted;
}
}
else
{
if (!setter.Parameters[c].IsAssignableFrom(convertedTo))
{
throw new XamlLoadException(
$"Runtime setter selection is not supported for non-last setter arguments (e. g. x:Key) and can not downcast argument {c} of the setter from {convertedTo} to {setter.Parameters[c]}",
arguments[c]);
}
}
s++;
}
}
}
XamlPropertyAssignmentNode CreateAssignment()
{
var matchedSetters = new List <IXamlPropertySetter>();
foreach (var setter in filteredSetters)
{
bool CanAssign(IXamlAstValueNode value, IXamlType type)
{
// Don't allow x:Null
if (!setter.BinderParameters.AllowXNull &&
XamlPseudoType.Null.Equals(value.Type.GetClrType()))
{
return(false);
}
// Direct cast
if (type.IsAssignableFrom(value.Type.GetClrType()))
{
return(true);
}
// Upcast from System.Object
if (value.Type.GetClrType().Equals(context.Configuration.WellKnownTypes.Object))
{
return(true);
}
return(false);
}
var valueArgIndex = arguments.Count - 1;
var valueArg = arguments[valueArgIndex];
var setterType = setter.Parameters[valueArgIndex];
if (CanAssign(valueArg, setterType))
{
matchedSetters.Add(setter);
}
// Converted value have more priority than custom setters, so we just create a setter without an alternative
else if (XamlTransformHelpers.TryConvertValue(context, valueArg, setterType, property,
out var converted))
{
arguments[valueArgIndex] = converted;
return(new XamlPropertyAssignmentNode(valueNode,
property, new[] { setter }, arguments));
}
}
if (matchedSetters.Count > 0)
{
return(new XamlPropertyAssignmentNode(v, property, matchedSetters, arguments));
}
throw new XamlLoadException(
$"Unable to find suitable setter or adder for property {property.Name} of type {property.DeclaringType.GetFqn()} for argument {v.Type.GetClrType().GetFqn()}"
+ (keyNode != null ? $" and x:Key of type {keyNode.Type.GetClrType()}" : null)
+ ", available setter parameter lists are:\n" + string.Join("\n",
filteredSetters.Select(setter =>
string.Join(", ", setter.Parameters.Select(p => p.FullName))))
, v);
}
assignments.Add(CreateAssignment());
}
if (assignments.Count == 1)
{
return(assignments[0]);
}
if (assignments.Count > 1)
{
// Skip the first one, since we only care about further setters, e. g. the following is perfectly valid:
// <Foo.Bar>
// <SomeList/>
// <ListItem/>
// <ListItem/>
// </Foo.Bar>
// <SomeList/> would be foo.Bar = new SomeList() and <ListItem/> would be foo.Bar.Add(new ListItem());
foreach (var ass in assignments.Skip(1))
{
ass.PossibleSetters = ass.PossibleSetters.Where(s => s.BinderParameters.AllowMultiple).ToList();
if (ass.PossibleSetters.Count == 0)
{
throw new XamlLoadException(
$"Unable to find a setter that allows multiple assignments to the property {ass.Property.Name} of type {ass.Property.DeclaringType.GetFqn()}",
node);
}
}
}
return(new XamlManipulationGroupNode(valueNode, assignments));
}
return(node);
}