public IXamlIlAstNode Transform(XamlIlAstTransformationContext context, IXamlIlAstNode node)
{
if (!(node is XamlIlAstObjectNode on))
{
return(node);
}
var nonDirectiveChildren = on.Children.Where(a => !(a is XamlIlAstXmlDirective)).ToList();
if (on.Arguments.Count != 0 ||
nonDirectiveChildren.Count != 1 ||
!(nonDirectiveChildren[0] is IXamlIlAstValueNode vn) ||
!vn.Type.GetClrType().Equals(context.Configuration.WellKnownTypes.String))
{
return(node);
}
if (XamlIlTransformHelpers.TryGetCorrectlyTypedValue(context, vn, on.Type.GetClrType(), out var rv))
{
if (nonDirectiveChildren.Count != on.Children.Count)
{
rv = new XamlIlValueWithManipulationNode(rv, rv,
new XamlIlManipulationGroupNode(rv, on.Children.OfType <XamlIlAstXmlDirective>()));
}
return(rv);
}
if (on.Type.GetClrType().IsValueType)
{
throw new XamlIlLoadException(
$"Unable to convert value {(vn as XamlIlAstTextNode)?.Text}) to {on.Type.GetClrType()}", vn);
}
// Parser not found, isn't a value type, probably a regular object creation node with text content
return(node);
}
IXamlIlConstructor TransformArgumentsAndGetConstructor(XamlIlAstTransformationContext context,
XamlIlAstObjectNode n)
{
var type = n.Type.GetClrType();
var argTypes = n.Arguments.Select(a => a.Type.GetClrType()).ToList();
var ctor = type.FindConstructor(argTypes);
if (ctor == null)
{
if (argTypes.Count != 0)
{
ctor = type.Constructors.FirstOrDefault(x =>
!x.IsStatic && x.IsPublic && x.Parameters.Count == argTypes.Count);
}
if (ctor == null)
{
throw new XamlIlLoadException(
$"Unable to find public constructor for type {type.GetFqn()}({string.Join(", ", argTypes.Select(at => at.GetFqn()))})",
n);
}
}
for (var c = 0; c < n.Arguments.Count; c++)
{
if (!XamlIlTransformHelpers.TryGetCorrectlyTypedValue(context, n.Arguments[c], ctor.Parameters[c], out var arg))
{
throw new XamlIlLoadException(
$"Unable to convert {n.Arguments[c].Type.GetClrType().GetFqn()} to {ctor.Parameters[c].GetFqn()} for constructor of {n.Type.GetClrType().GetFqn()}",
n.Arguments[c]);
}
n.Arguments[c] = arg;
}
return(ctor);
}
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 IXamlIlAstNode Transform(XamlIlAstTransformationContext context, IXamlIlAstNode node)
{
if (node is XamlIlAstXamlPropertyValueNode valueNode)
{
var property = valueNode.Property.GetClrProperty();
var assignments = new List <XamlIlPropertyAssignmentNode>();
foreach (var v in valueNode.Values)
{
var keyNode = FindAndRemoveKey(v);
var arguments = new List <IXamlIlAstValueNode>();
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++)
{
IXamlIlType convertedTo = null;
for (var s = 0; s < filteredSetters.Count;)
{
var setter = filteredSetters[s];
if (convertedTo == null)
{
if (!XamlIlTransformHelpers.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 XamlIlLoadException(
$"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++;
}
}
}
XamlIlPropertyAssignmentNode CreateAssignment()
{
var matchedSetters = new List <IXamlIlPropertySetter>();
foreach (var setter in filteredSetters)
{
bool CanAssign(IXamlIlAstValueNode value, IXamlIlType type)
{
// Don't allow x:Null
if (!setter.BinderParameters.AllowXNull &&
XamlIlPseudoType.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 (XamlIlTransformHelpers.TryConvertValue(context, valueArg, setterType, property,
out var converted))
{
arguments[valueArgIndex] = converted;
return(new XamlIlPropertyAssignmentNode(valueNode,
property, new[] { setter }, arguments));
}
}
if (matchedSetters.Count > 0)
{
return(new XamlIlPropertyAssignmentNode(v, property, matchedSetters, arguments));
}
throw new XamlIlLoadException(
$"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 XamlIlLoadException(
$"Unable to find a setter that allows multiple assignments to the property {ass.Property.Name} of type {ass.Property.DeclaringType.GetFqn()}",
node);
}
}
}
return(new XamlIlManipulationGroupNode(valueNode, assignments));
}
return(node);
}
public IXamlIlAstNode Transform(XamlIlAstTransformationContext context, IXamlIlAstNode node)
{
if (!(node is XamlIlAstObjectNode on &&
on.Type.GetClrType().FullName == "Avalonia.Styling.Setter"))
{
return(node);
}
var parent = context.ParentNodes().OfType <XamlIlAstObjectNode>()
.FirstOrDefault(p => p.Type.GetClrType().FullName == "Avalonia.Styling.Style");
if (parent == null)
{
throw new XamlIlParseException(
"Avalonia.Styling.Setter is only valid inside Avalonia.Styling.Style", node);
}
var selectorProperty = parent.Children.OfType <XamlIlAstXamlPropertyValueNode>()
.FirstOrDefault(p => p.Property.GetClrProperty().Name == "Selector");
if (selectorProperty == null)
{
throw new XamlIlParseException(
"Can not find parent Style Selector", node);
}
var selector = selectorProperty.Values.FirstOrDefault() as XamlIlSelectorNode;
if (selector?.TargetType == null)
{
throw new XamlIlParseException(
"Can not resolve parent Style Selector type", node);
}
var property = @on.Children.OfType <XamlIlAstXamlPropertyValueNode>()
.FirstOrDefault(x => x.Property.GetClrProperty().Name == "Property");
if (property == null)
{
throw new XamlIlParseException("Setter without a property is not valid", node);
}
var propertyName = property.Values.OfType <XamlIlAstTextNode>().FirstOrDefault()?.Text;
if (propertyName == null)
{
throw new XamlIlParseException("Setter.Property must be a string", node);
}
var avaloniaPropertyNode = XamlIlAvaloniaPropertyHelper.CreateNode(context, propertyName,
new XamlIlAstClrTypeReference(selector, selector.TargetType, false), property.Values[0]);
property.Values = new List <IXamlIlAstValueNode>
{
avaloniaPropertyNode
};
var valueProperty = on.Children
.OfType <XamlIlAstXamlPropertyValueNode>().FirstOrDefault(p => p.Property.GetClrProperty().Name == "Value");
if (valueProperty?.Values?.Count == 1 && valueProperty.Values[0] is XamlIlAstTextNode)
{
var propType = avaloniaPropertyNode.AvaloniaPropertyType;
if (!XamlIlTransformHelpers.TryGetCorrectlyTypedValue(context, valueProperty.Values[0],
propType, out var converted))
{
throw new XamlIlParseException(
$"Unable to convert property value to {propType.GetFqn()}",
valueProperty.Values[0]);
}
valueProperty.Property = new SetterValueProperty(valueProperty.Property,
on.Type.GetClrType(), propType, context.GetAvaloniaTypes());
}
return(node);
}
