public static bool TryGetEnumValue(IXamlIlType enumType, string value, out object rv)
{
rv = null;
if (long.TryParse(value, out var parsedLong))
{
var enumTypeName = enumType.GetEnumUnderlyingType().Name;
rv = enumTypeName == "Int32" || enumTypeName == "UInt32" ?
unchecked ((int)parsedLong) :
(object)parsedLong;
return(true);
}
var values = enumType.CustomAttributes.Any(a => a.Type.Name == "FlagsAttribute") ?
value.Split(',').Select(x => x.Trim()).ToArray() :
new[] { value };
object cv = null;
for (var c = 0; c < values.Length; c++)
{
var enumValueField = enumType.Fields.FirstOrDefault(f => f.Name == values[c]);
if (enumValueField == null)
{
return(false);
}
var enumValue = GetLiteralFieldConstantValue(enumValueField);
if (c == 0)
{
cv = enumValue;
}
else
{
cv = Or(cv, enumValue);
}
}
rv = cv;
return(true);
}
public static bool TryConvertValue(XamlIlAstTransformationContext context,
IXamlIlAstValueNode node, IXamlIlType type, out IXamlIlAstValueNode 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 XamlIlAstTextNode tn)
{
if (type.IsEnum)
{
var enumValue = type.Fields.FirstOrDefault(f => f.Name == tn.Text);
if (enumValue == null && !string.IsNullOrWhiteSpace(tn.Text) &&
long.TryParse(tn.Text, out var parsed))
{
var enumTypeName = type.GetEnumUnderlyingType().Name;
var obj = enumTypeName == "Int32" || enumTypeName == "UInt32" ?
unchecked ((int)parsed) :
(object)parsed;
rv = new XamlIlConstantNode(node, type, obj);
return(true);
}
if (enumValue != null)
{
rv = TypeSystemHelpers.GetLiteralFieldConstantNode(enumValue, node);
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 = XamlIlTypeReferenceResolver.ResolveType(context, tn.Text, false, tn, true);
rv = new XamlIlTypeExtensionNode(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 XamlIlLoadMethodDelegateNode(tn, context.RootObject, type, handler);
return(true);
}
}
}
IXamlIlAstValueNode CreateInvariantCulture() =>
new XamlIlStaticOrTargetedReturnMethodCallNode(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 <IXamlIlAstValueNode> {
node
};
if (parser.Parameters.Count == 2)
{
args.Add(CreateInvariantCulture());
}
rv = new XamlIlStaticOrTargetedReturnMethodCallNode(node, parser, args);
return(true);
}
if (cfg.TypeMappings.TypeDescriptorContext != null)
{
var typeConverterAttribute =
cfg.GetCustomAttribute(type, cfg.TypeMappings.TypeConverterAttributes).FirstOrDefault();
if (typeConverterAttribute != null)
{
var arg = typeConverterAttribute.Parameters.FirstOrDefault();
var converterType = (arg as IXamlIlType) ??
(arg is String sarg ? cfg.TypeSystem.FindType(sarg) : null);
if (converterType != null)
{
var converterMethod = converterType.FindMethod("ConvertFrom", cfg.WellKnownTypes.Object, false,
cfg.TypeMappings.TypeDescriptorContext, cfg.WellKnownTypes.CultureInfo,
cfg.WellKnownTypes.Object);
rv = new XamlIlAstNeedsParentStackValueNode(node,
new XamlIlAstRuntimeCastNode(node,
new XamlIlStaticOrTargetedReturnMethodCallNode(node, converterMethod,
new[]
{
new XamlIlAstNewClrObjectNode(node,
new XamlIlAstClrTypeReference(node, converterType, false), null,
new List <IXamlIlAstValueNode>()),
new XamlIlAstContextLocalNode(node, cfg.TypeMappings.TypeDescriptorContext),
CreateInvariantCulture(),
node
}), new XamlIlAstClrTypeReference(node, type, false)));
return(true);
}
}
}
return(false);
}