public static IEnumerable <IXamlMethod> GetMarkupExtensionProvideValueAlternatives(
AstTransformationContext context,
IXamlType type)
{
var sp = context.Configuration.TypeMappings.ServiceProvider;
return(type.FindMethods(m =>
(m.Name == "ProvideValue" || m.Name == "ProvideTypedValue") && m.IsPublic && !m.IsStatic &&
(m.Parameters.Count == 0 || (m.Parameters.Count == 1 && m.Parameters[0].Equals(sp)))
));
}
public static bool TryGetCorrectlyTypedValue(AstTransformationContext context,
IXamlAstValueNode node, IXamlType type, out IXamlAstValueNode rv)
{
if (type.IsAssignableFrom(node.Type.GetClrType()))
{
rv = node;
return(true);
}
return(TryConvertValue(context, node, type, null, out rv));
}
public static bool TryConvertMarkupExtension(AstTransformationContext context,
IXamlAstValueNode node, out XamlMarkupExtensionNode o)
{
var cache = context.GetOrCreateItem <MarkupExtensionProvideValueCache>();
o = null;
var nodeType = node.Type.GetClrType();
if (!cache.TypeToProvideValue.TryGetValue(nodeType, out var provideValue))
{
var candidates = GetMarkupExtensionProvideValueAlternatives(context, nodeType).ToList();
var so = context.Configuration.WellKnownTypes.Object;
var sp = context.Configuration.TypeMappings.ServiceProvider;
// Try non-object variant first and variants without IServiceProvider argument first
provideValue = candidates.FirstOrDefault(m => m.Parameters.Count == 0 && !m.ReturnType.Equals(so))
?? candidates.FirstOrDefault(m => m.Parameters.Count == 0)
?? candidates.FirstOrDefault(m =>
m.Parameters.Count == 1 && m.Parameters[0].Equals(sp) &&
!m.ReturnType.Equals(so))
?? candidates.FirstOrDefault(m =>
m.Parameters.Count == 1 && m.Parameters[0].Equals(sp));
cache.TypeToProvideValue[nodeType] = provideValue;
}
if (provideValue == null)
{
if (node.Type.IsMarkupExtension)
{
throw new XamlParseException(
$"{node.Type.GetClrType().GetFqn()} was resolved as markup extension, but doesn't have a matching ProvideValue/ProvideTypedValue method",
node.Type);
}
return(false);
}
o = new XamlMarkupExtensionNode(node, provideValue, node);
return(true);
}
public static IReadOnlyList <IXamlMethod> FindPossibleAdders(AstTransformationContext context,
IXamlType type)
{
IReadOnlyList <IXamlMethod> FindPossibleAddersImpl()
{
var known = context.Configuration.WellKnownTypes;
// Attempt to cast IEnumerable and IEnumerable<T> to IList<T>
var actualType = type;
if (actualType.Equals(known.IEnumerable))
{
actualType = known.IList;
}
if (actualType.GenericTypeDefinition?.Equals(known.IEnumerableT) == true)
{
actualType = known.IListOfT.MakeGenericType(actualType.GenericArguments[0]);
}
var inspectTypes = new List <IXamlType>();
inspectTypes.Add(actualType);
inspectTypes.AddRange(actualType.GetAllInterfaces());
// If type supports IList<T> don't fall back to IList
if (inspectTypes.Any(t => t.GenericTypeDefinition?.Equals(known.IListOfT) == true))
{
inspectTypes = inspectTypes.Where(t => !t.Equals(known.IList)).ToList();
}
var rv = new List <IXamlMethod>();
foreach (var t in inspectTypes)
{
foreach (var m in t.FindMethods(m => m.Name == "Add" && m.IsPublic && !m.IsStatic &&
(m.Parameters.Count == 1 || m.Parameters.Count == 2)))
{
if (rv.Any(em => em.Equals(m)))
{
continue;
}
rv.Add(m);
}
}
// First use methods from the type itself, then from base types, then from interfaces
rv = rv
.OrderByDescending(x => x.ThisOrFirstParameter().Equals(actualType))
.ThenBy(x => x.ThisOrFirstParameter().IsInterface)
.ToList();
// Add casts
for (var c = 0; c < rv.Count; c++)
{
if (!rv[c].ThisOrFirstParameter().Equals(type))
{
rv[c] = new XamlMethodWithCasts(rv[c], new[] { type }.Concat(rv[c].Parameters));
}
}
return(rv);
}
var cache = context.GetOrCreateItem <AdderCache>();
if (cache.TryGetValue(type, out var rvr))
{
return(rvr);
}
else
{
return(cache[type] = FindPossibleAddersImpl());
}
}
public static bool TryConvertValue(AstTransformationContext context,
IXamlAstValueNode node, IXamlType type, XamlAstClrProperty propertyContext,
out IXamlAstValueNode rv)
{
rv = null;
var cfg = context.Configuration;
// Since we are doing a conversion anyway, it makes sense to check for the underlying nullable type
if (type.GenericTypeDefinition?.Equals(cfg.WellKnownTypes.NullableT) == true)
{
type = type.GenericArguments[0];
}
if (cfg.CustomValueConverter?.Invoke(context, node, type, out rv) == true)
{
return(true);
}
var nodeType = node.Type.GetClrType();
// Implicit type converters
if (!nodeType.Equals(cfg.WellKnownTypes.String))
{
return(false);
}
if (node is XamlAstTextNode tn)
{
if (type.IsEnum)
{
if (TypeSystemHelpers.TryGetEnumValueNode(type, tn.Text, tn, out var enumConstantNode))
{
rv = enumConstantNode;
return(true);
}
}
// Well known types
if (TypeSystemHelpers.ParseConstantIfTypeAllows(tn.Text, type, tn, out var constantNode))
{
rv = constantNode;
return(true);
}
if (type.FullName == "System.Type")
{
var resolvedType = TypeReferenceResolver.ResolveType(context, tn.Text, false, tn, true);
rv = new XamlTypeExtensionNode(tn, resolvedType, type);
return(true);
}
if (cfg.WellKnownTypes.Delegate.IsAssignableFrom(type))
{
var invoke = type.FindMethod(m => m.Name == "Invoke");
var rootType = context.RootObject.Type.GetClrType();
var handler =
rootType.FindMethod(tn.Text, invoke.ReturnType, false, invoke.Parameters.ToArray());
if (handler != null)
{
rv = new XamlLoadMethodDelegateNode(tn, context.RootObject, type, handler);
return(true);
}
}
}
IXamlAstValueNode CreateInvariantCulture() =>
new XamlStaticOrTargetedReturnMethodCallNode(node,
cfg.WellKnownTypes.CultureInfo.Methods.First(x =>
x.IsPublic && x.IsStatic && x.Name == "get_InvariantCulture"), null);
var candidates = type.Methods.Where(m => m.Name == "Parse" &&
m.ReturnType.Equals(type) &&
m.Parameters.Count > 0 &&
m.Parameters[0].Equals(cfg.WellKnownTypes.String)).ToList();
// Types with parse method
var parser = candidates.FirstOrDefault(m =>
m.Parameters.Count == 2 &&
(
m.Parameters[1].Equals(cfg.WellKnownTypes.CultureInfo) ||
m.Parameters[1].Equals(cfg.WellKnownTypes.IFormatProvider)
)
)
?? candidates.FirstOrDefault(m => m.Parameters.Count == 1);
if (parser != null)
{
var args = new List <IXamlAstValueNode> {
node
};
if (parser.Parameters.Count == 2)
{
args.Add(CreateInvariantCulture());
}
rv = new XamlStaticOrTargetedReturnMethodCallNode(node, parser, args);
return(true);
}
if (cfg.TypeMappings.TypeDescriptorContext != null)
{
IXamlType converterType = null;
if (propertyContext?.TypeConverters.TryGetValue(type, out converterType) != true)
{
var typeConverterAttribute =
cfg.GetCustomAttribute(type, cfg.TypeMappings.TypeConverterAttributes).FirstOrDefault();
if (typeConverterAttribute != null)
{
converterType = TryGetTypeConverterFromCustomAttribute(cfg, typeConverterAttribute);
}
}
if (converterType != null)
{
var converterMethod = converterType.FindMethod("ConvertFrom", cfg.WellKnownTypes.Object, false,
cfg.TypeMappings.TypeDescriptorContext, cfg.WellKnownTypes.CultureInfo,
cfg.WellKnownTypes.Object);
rv = new XamlAstNeedsParentStackValueNode(node,
new XamlAstRuntimeCastNode(node,
new XamlStaticOrTargetedReturnMethodCallNode(node, converterMethod,
new[]
{
new XamlAstNewClrObjectNode(node,
new XamlAstClrTypeReference(node, converterType, false), null,
new List <IXamlAstValueNode>()),
new XamlAstContextLocalNode(node, cfg.TypeMappings.TypeDescriptorContext),
CreateInvariantCulture(), node
}), new XamlAstClrTypeReference(node, type, false)));
return(true);
}
}
return(false);
}
public Visitor(AstTransformationContext context, IXamlAstTransformer transformer)
{
_context = context;
_transformer = transformer;
}