public static IXamlIlAvaloniaPropertyNode CreateNode(XamlIlAstTransformationContext context,
string propertyName, IXamlIlAstTypeReference selectorTypeReference, IXamlIlLineInfo lineInfo)
{
XamlIlAstNamePropertyReference forgedReference;
var parser = new PropertyParser();
var parsedPropertyName = parser.Parse(new CharacterReader(propertyName.AsSpan()));
if (parsedPropertyName.owner == null)
{
forgedReference = new XamlIlAstNamePropertyReference(lineInfo, selectorTypeReference,
propertyName, selectorTypeReference);
}
else
{
var xmlOwner = parsedPropertyName.ns;
if (xmlOwner != null)
{
xmlOwner += ":";
}
xmlOwner += parsedPropertyName.owner;
var tref = XamlIlTypeReferenceResolver.ResolveType(context, xmlOwner, false, lineInfo, true);
var propertyFieldName = parsedPropertyName.name + "Property";
var found = tref.Type.GetAllFields()
.FirstOrDefault(f => f.IsStatic && f.IsPublic && f.Name == propertyFieldName);
if (found == null)
{
throw new XamlIlParseException(
$"Unable to find {propertyFieldName} field on type {tref.Type.GetFullName()}", lineInfo);
}
return(new XamlIlAvaloniaPropertyFieldNode(context.GetAvaloniaTypes(), lineInfo, found));
}
var clrProperty =
((XamlIlAstClrProperty) new XamlIlPropertyReferenceResolver().Transform(context,
forgedReference));
return(new XamlIlAvaloniaPropertyNode(lineInfo,
context.Configuration.TypeSystem.GetType("Avalonia.AvaloniaProperty"),
clrProperty));
}
public static XamlIlAvaloniaPropertyNode CreateNode(XamlIlAstTransformationContext context,
string propertyName, IXamlIlAstTypeReference selectorTypeReference, IXamlIlLineInfo lineInfo)
{
XamlIlAstNamePropertyReference forgedReference;
var parser = new PropertyParser();
var parsedPropertyName = parser.Parse(new CharacterReader(propertyName.AsSpan()));
if (parsedPropertyName.owner == null)
{
forgedReference = new XamlIlAstNamePropertyReference(lineInfo, selectorTypeReference,
propertyName, selectorTypeReference);
}
else
{
var xmlOwner = parsedPropertyName.ns;
if (xmlOwner != null)
{
xmlOwner += ":";
}
xmlOwner += parsedPropertyName.owner;
var tref = XamlIlTypeReferenceResolver.ResolveType(context, xmlOwner, false, lineInfo, true);
forgedReference = new XamlIlAstNamePropertyReference(lineInfo,
tref, parsedPropertyName.name, tref);
}
var clrProperty =
((XamlIlAstClrProperty) new XamlIlPropertyReferenceResolver().Transform(context,
forgedReference));
return(new XamlIlAvaloniaPropertyNode(lineInfo,
context.Configuration.TypeSystem.GetType("Avalonia.AvaloniaProperty"),
clrProperty));
}
public IXamlIlAstNode Transform(XamlIlAstTransformationContext context, IXamlIlAstNode node)
{
if (!(node is XamlIlAstObjectNode on && on.Type.GetClrType().FullName == "Avalonia.Styling.Style"))
{
return(node);
}
var pn = on.Children.OfType <XamlIlAstXamlPropertyValueNode>()
.FirstOrDefault(p => p.Property.GetClrProperty().Name == "Selector");
if (pn == null)
{
return(node);
}
if (pn.Values.Count != 1)
{
throw new XamlIlParseException("Selector property should should have exactly one value", node);
}
if (pn.Values[0] is XamlIlSelectorNode)
{
//Deja vu. I've just been in this place before
return(node);
}
if (!(pn.Values[0] is XamlIlAstTextNode tn))
{
throw new XamlIlParseException("Selector property should be a text node", node);
}
var selectorType = pn.Property.GetClrProperty().Getter.ReturnType;
var initialNode = new XamlIlSelectorInitialNode(node, selectorType);
XamlIlSelectorNode Create(IEnumerable <SelectorGrammar.ISyntax> syntax,
Func <string, string, XamlIlAstClrTypeReference> typeResolver)
{
XamlIlSelectorNode result = initialNode;
XamlIlOrSelectorNode results = null;
foreach (var i in syntax)
{
switch (i)
{
case SelectorGrammar.OfTypeSyntax ofType:
result = new XamlIlTypeSelector(result, typeResolver(ofType.Xmlns, ofType.TypeName).Type, true);
break;
case SelectorGrammar.IsSyntax @is:
result = new XamlIlTypeSelector(result, typeResolver(@is.Xmlns, @is.TypeName).Type, false);
break;
case SelectorGrammar.ClassSyntax @class:
result = new XamlIlStringSelector(result, XamlIlStringSelector.SelectorType.Class, @class.Class);
break;
case SelectorGrammar.NameSyntax name:
result = new XamlIlStringSelector(result, XamlIlStringSelector.SelectorType.Name, name.Name);
break;
case SelectorGrammar.PropertySyntax property:
{
var type = result?.TargetType;
if (type == null)
{
throw new XamlIlParseException("Property selectors must be applied to a type.", node);
}
var targetProperty =
type.GetAllProperties().FirstOrDefault(p => p.Name == property.Property);
if (targetProperty == null)
{
throw new XamlIlParseException($"Cannot find '{property.Property}' on '{type}", node);
}
if (!XamlIlTransformHelpers.TryGetCorrectlyTypedValue(context,
new XamlIlAstTextNode(node, property.Value, context.Configuration.WellKnownTypes.String),
targetProperty.PropertyType, out var typedValue))
{
throw new XamlIlParseException(
$"Cannot convert '{property.Value}' to '{targetProperty.PropertyType.GetFqn()}",
node);
}
result = new XamlIlPropertyEqualsSelector(result, targetProperty, typedValue);
break;
}
case SelectorGrammar.ChildSyntax child:
result = new XamlIlCombinatorSelector(result, XamlIlCombinatorSelector.SelectorType.Child);
break;
case SelectorGrammar.DescendantSyntax descendant:
result = new XamlIlCombinatorSelector(result, XamlIlCombinatorSelector.SelectorType.Descendant);
break;
case SelectorGrammar.TemplateSyntax template:
result = new XamlIlCombinatorSelector(result, XamlIlCombinatorSelector.SelectorType.Template);
break;
case SelectorGrammar.NotSyntax not:
result = new XamlIlNotSelector(result, Create(not.Argument, typeResolver));
break;
case SelectorGrammar.CommaSyntax comma:
if (results == null)
{
results = new XamlIlOrSelectorNode(node, selectorType);
}
results.Add(result);
result = initialNode;
break;
default:
throw new XamlIlParseException($"Unsupported selector grammar '{i.GetType()}'.", node);
}
}
if (results != null && result != null)
{
results.Add(result);
}
return(results ?? result);
}
IEnumerable <SelectorGrammar.ISyntax> parsed;
try
{
parsed = SelectorGrammar.Parse(tn.Text);
}
catch (Exception e)
{
throw new XamlIlParseException("Unable to parse selector: " + e.Message, node);
}
var selector = Create(parsed, (p, n)
=> XamlIlTypeReferenceResolver.ResolveType(context, $"{p}:{n}", true, node, true));
pn.Values[0] = selector;
return(new AvaloniaXamlIlTargetTypeMetadataNode(on,
new XamlIlAstClrTypeReference(selector, selector.TargetType, false),
AvaloniaXamlIlTargetTypeMetadataNode.ScopeTypes.Style));
}
public static bool TryConvertValue(XamlIlAstTransformationContext context,
IXamlIlAstValueNode node, IXamlIlType type, XamlIlAstClrProperty propertyContext,
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)
{
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 = 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)
{
IXamlIlType 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 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);
}
