Refactor ModelElement.element to be a getter; subclasses provide the field

lib/src/generator/templates.runtime_renderers.dart

@@ -2970,28 +2970,6 @@ class _Renderer_Container extends RendererBase<Container> {
                       self.renderSimpleVariable(c, remainingNames, 'bool'),
                   getBool: (CT_ c) => c.isMixin == true,
                 ),
-                'package': Property(
-                  getValue: (CT_ c) => c.package,
-                  renderVariable:
-                      (CT_ c, Property<CT_> self, List<String> remainingNames) {
-                    if (remainingNames.isEmpty) {
-                      return self.getValue(c).toString();
-                    }
-                    var name = remainingNames.first;
-                    var nextProperty =
-                        _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(
-                        self.getValue(c) as Package,
-                        nextProperty,
-                        [...remainingNames.skip(1)]);
-                  },
-                  isNullValue: (CT_ c) => false,
-                  renderValue: (CT_ c, RendererBase<CT_> r,
-                      List<MustachioNode> ast, StringSink sink) {
-                    _render_Package(c.package, ast, r.template, sink,
-                        parent: r);
-                  },
-                ),
                 'publicConstantFields': Property(
                   getValue: (CT_ c) => c.publicConstantFields,
                   renderVariable: (CT_ c, Property<CT_> self,
@@ -4358,6 +4336,19 @@ class _Renderer_Enum extends RendererBase<Enum> {
                         _render_Field(e, ast, r.template, sink, parent: r));
                   },
                 ),
+                'element': Property(
+                  getValue: (CT_ c) => c.element,
+                  renderVariable: (CT_ c, Property<CT_> self,
+                          List<String> remainingNames) =>
+                      self.renderSimpleVariable(
+                          c, remainingNames, 'EnumElement'),
+                  isNullValue: (CT_ c) => false,
+                  renderValue: (CT_ c, RendererBase<CT_> r,
+                      List<MustachioNode> ast, StringSink sink) {
+                    renderSimple(c.element, ast, r.template, sink,
+                        parent: r, getters: _invisibleGetters['EnumElement']!);
+                  },
+                ),
                 'hasPublicEnumValues': Property(
                   getValue: (CT_ c) => c.hasPublicEnumValues,
                   renderVariable: (CT_ c, Property<CT_> self,
@@ -12218,13 +12209,13 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
   }
 }
 
-String renderError(PackageTemplateData context, Template template) {
+String renderIndex(PackageTemplateData context, Template template) {
   var buffer = StringBuffer();
   _render_PackageTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-String renderIndex(PackageTemplateData context, Template template) {
+String renderError(PackageTemplateData context, Template template) {
   var buffer = StringBuffer();
   _render_PackageTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
@@ -14341,6 +14332,20 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                         parent: r);
                   },
                 ),
+                'element': Property(
+                  getValue: (CT_ c) => c.element,
+                  renderVariable: (CT_ c, Property<CT_> self,
+                          List<String> remainingNames) =>
+                      self.renderSimpleVariable(
+                          c, remainingNames, 'TopLevelVariableElement'),
+                  isNullValue: (CT_ c) => false,
+                  renderValue: (CT_ c, RendererBase<CT_> r,
+                      List<MustachioNode> ast, StringSink sink) {
+                    renderSimple(c.element, ast, r.template, sink,
+                        parent: r,
+                        getters: _invisibleGetters['TopLevelVariableElement']!);
+                  },
+                ),
                 'enclosingElement': Property(
                   getValue: (CT_ c) => c.enclosingElement,
                   renderVariable:
@@ -15900,6 +15905,7 @@ const _invisibleGetters = {
     'isVisibleForTesting',
     'runtimeType'
   },
+  'EnumElement': {'augmented', 'hashCode', 'runtimeType'},
   'ExecutableMember': {
     'context',
     'declaration',
@@ -16404,6 +16410,12 @@ const _invisibleGetters = {
     'toolVersion',
     'useBaseHref'
   },
+  'TopLevelVariableElement': {
+    'declaration',
+    'hashCode',
+    'isExternal',
+    'runtimeType'
+  },
   'TypeAliasElement': {
     'aliasedElement',
     'aliasedType',

lib/src/model/accessor.dart

@@ -16,6 +16,9 @@ import 'package:dartdoc/src/warnings.dart';
 
 /// Getters and setters.
 class Accessor extends ModelElement implements EnclosedElement {
+  @override
+  final PropertyAccessorElement element;
+
   /// The combo ([Field] or [TopLevelVariable]) containing this accessor.
   ///
   /// Initialized in [Field]'s constructor and in [TopLevelVariable]'s
@@ -24,8 +27,7 @@ class Accessor extends ModelElement implements EnclosedElement {
   // initialized by code inside this library.
   late GetterSetterCombo enclosingCombo;
 
-  Accessor(
-      PropertyAccessorElement super.element, super.library, super.packageGraph,
+  Accessor(this.element, super.library, super.packageGraph,
       [ExecutableMember? super.originalMember]);
 
   @override
@@ -38,10 +40,6 @@ class Accessor extends ModelElement implements EnclosedElement {
     return super.characterLocation;
   }
 
-  @override
-  PropertyAccessorElement get element =>
-      super.element as PropertyAccessorElement;
-
   @override
   ExecutableMember? get originalMember =>
       super.originalMember as ExecutableMember?;

lib/src/model/class.dart

@@ -14,14 +14,14 @@ import 'package:dartdoc/src/model/model.dart';
 /// **inherited**: Filtered getters giving only inherited children.
 class Class extends InheritingContainer
     with Constructable, TypeImplementing, MixedInTypes {
-  Class(ClassElement element, Library library, PackageGraph packageGraph)
-      : super(element, library, packageGraph) {
+  @override
+  final ClassElement element;
+
+  Class(this.element, Library library, PackageGraph packageGraph)
+      : super(library, packageGraph) {
     packageGraph.specialClasses.addSpecial(this);
   }
 
-  @override
-  ClassElement get element => super.element as ClassElement;
-
   @override
   late final List<ModelElement> allModelElements = [
     ...super.allModelElements,

lib/src/model/constructor.dart

@@ -11,8 +11,10 @@ import 'package:dartdoc/src/model/model.dart';
 class Constructor extends ModelElement
     with TypeParameters, ContainerMember
     implements EnclosedElement {
-  Constructor(
-      ConstructorElement super.element, super.library, super.packageGraph);
+  @override
+  final ConstructorElement element;
+
+  Constructor(this.element, super.library, super.packageGraph);
 
   @override
   CharacterLocation? get characterLocation {
@@ -25,9 +27,6 @@ class Constructor extends ModelElement
     return super.characterLocation;
   }
 
-  @override
-  ConstructorElement get element => super.element as ConstructorElement;
-
   @override
   List<TypeParameter> get typeParameters =>
       (enclosingElement as Constructable).typeParameters;

lib/src/model/container.dart

@@ -29,11 +29,7 @@ import 'package:meta/meta.dart';
 ///   are empty.  These are available mostly for the templating system.
 abstract class Container extends ModelElement
     with Categorization, TypeParameters {
-  Container(super.element, super.library, super.packageGraph);
-
-  /// Containers must have associated packages.
-  @override
-  Package get package => super.package;
+  Container(super.library, super.packageGraph);
 
   // TODO(jcollins-g): Implement a ContainerScope that flattens supertypes?
   @override

lib/src/model/dynamic.dart

@@ -8,8 +8,11 @@ import 'package:dartdoc/src/model/comment_referable.dart';
 import 'package:dartdoc/src/model/model.dart';
 
 class Dynamic extends ModelElement with HasNoPage {
-  Dynamic(Element element, PackageGraph packageGraph)
-      : super(element, Library.sentinel, packageGraph);
+  @override
+  final Element element;
+
+  Dynamic(this.element, PackageGraph packageGraph)
+      : super(Library.sentinel, packageGraph);
 
   UndefinedElementType get modelType =>
       throw UnimplementedError('(${element.runtimeType}) $element');

lib/src/model/enum.dart

@@ -10,7 +10,10 @@ import 'package:dartdoc/src/render/enum_field_renderer.dart';
 
 class Enum extends InheritingContainer
     with Constructable, TypeImplementing, MixedInTypes {
-  Enum(super.element, super.library, super.packageGraph);
+  @override
+  final EnumElement element;
+
+  Enum(this.element, super.library, super.packageGraph);
 
   @override
   late final List<ModelElement> allModelElements = [

lib/src/model/extension.dart

@@ -12,10 +12,13 @@ import 'package:meta/meta.dart';
 
 /// Extension methods
 class Extension extends Container implements EnclosedElement {
+  @override
+  final ExtensionElement element;
+
   late final ElementType extendedType =
       modelBuilder.typeFrom(element.extendedType, library);
 
-  Extension(ExtensionElement super.element, super.library, super.packageGraph);
+  Extension(this.element, super.library, super.packageGraph);
 
   /// Detect if this extension applies to every object.
   bool get alwaysApplies =>
@@ -56,9 +59,6 @@ class Extension extends Container implements EnclosedElement {
       .map((e) => modelBuilder.from(e, library) as Method)
       .toList(growable: false);
 
-  @override
-  ExtensionElement get element => super.element as ExtensionElement;
-
   @override
   String get name => element.name == null ? '' : super.name;
 

lib/src/model/field.dart

@@ -10,15 +10,18 @@ import 'package:dartdoc/src/render/source_code_renderer.dart';
 class Field extends ModelElement
     with GetterSetterCombo, ContainerMember, Inheritable
     implements EnclosedElement {
+  @override
+  final FieldElement element;
+
   bool _isInherited = false;
   late final Container _enclosingContainer;
   @override
   final ContainerAccessor? getter;
   @override
   final ContainerAccessor? setter;
 
-  Field(FieldElement super.element, super.library, super.packageGraph,
-      this.getter, this.setter)
+  Field(
+      this.element, super.library, super.packageGraph, this.getter, this.setter)
       : assert(getter != null || setter != null) {
     getter?.enclosingCombo = this;
     setter?.enclosingCombo = this;
@@ -41,9 +44,6 @@ class Field extends ModelElement
     return newField;
   }
 
-  @override
-  FieldElement get element => super.element as FieldElement;
-
   @override
   String get documentation {
     if (enclosingElement is Enum) {

lib/src/model/inheriting_container.dart

@@ -182,17 +182,18 @@ abstract class InheritingContainer extends Container
     with ExtensionTarget
     implements EnclosedElement {
   @override
-  InterfaceElement get element => super.element as InterfaceElement;
-
-  DefinedElementType? _supertype;
-  DefinedElementType? get supertype =>
-      _supertype ??= element.supertype?.element2.supertype == null
-          ? null
-          : modelBuilder.typeFrom(element.supertype!, library)
-              as DefinedElementType?;
+  InterfaceElement get element;
+
+  late final DefinedElementType? supertype = () {
+    final elementSupertype = element.supertype;
+    return elementSupertype == null ||
+            elementSupertype.element2.supertype == null
+        ? null
+        : modelBuilder.typeFrom(elementSupertype, library)
+            as DefinedElementType;
+  }();
 
-  InheritingContainer(
-      InterfaceElement super.element, super.library, super.packageGraph);
+  InheritingContainer(super.library, super.packageGraph);
 
   @override
   Iterable<Method> get instanceMethods =>

lib/src/model/library.dart

@@ -59,6 +59,9 @@ class _LibrarySentinel implements Library {
 }
 
 class Library extends ModelElement with Categorization, TopLevelContainer {
+  @override
+  final LibraryElement element;
+
   final Set<Element> _exportedAndLocalElements;
   final String _restoredUri;
 
@@ -77,9 +80,9 @@ class Library extends ModelElement with Categorization, TopLevelContainer {
   /// abstract getter.
   static final Library sentinel = _LibrarySentinel();
 
-  Library._(LibraryElement element, PackageGraph packageGraph, this.package,
+  Library._(this.element, PackageGraph packageGraph, this.package,
       this._restoredUri, this._exportedAndLocalElements)
-      : super(element, sentinel, packageGraph);
+      : super(sentinel, packageGraph);
 
   factory Library.fromLibraryResult(DartDocResolvedLibrary resolvedLibrary,
       PackageGraph packageGraph, Package package) {
@@ -185,9 +188,6 @@ class Library extends ModelElement with Categorization, TopLevelContainer {
   @override
   Iterable<Class> get classes => allClasses.where((c) => !c.isErrorOrException);
 
-  @override
-  LibraryElement get element => super.element as LibraryElement;
-
   @override
   late final Iterable<Extension> extensions = _exportedAndLocalElements
       .whereType<ExtensionElement>()

lib/src/model/method.dart

@@ -14,20 +14,26 @@ import 'package:dartdoc/src/model/model.dart';
 class Method extends ModelElement
     with ContainerMember, Inheritable, TypeParameters
     implements EnclosedElement {
-  bool _isInherited = false;
+  @override
+  final MethodElement element;
+
   Container? _enclosingContainer;
+
+  final bool _isInherited;
+
   @override
   late final List<TypeParameter> typeParameters;
 
-  Method(MethodElement super.element, super.library, super.packageGraph) {
+  Method(this.element, super.library, super.packageGraph)
+      : _isInherited = false {
     _calcTypeParameters();
   }
 
-  Method.inherited(MethodElement element, this._enclosingContainer,
-      Library library, PackageGraph packageGraph,
+  Method.inherited(this.element, this._enclosingContainer, Library library,
+      PackageGraph packageGraph,
       {ExecutableMember? originalMember})
-      : super(element, library, packageGraph, originalMember) {
-    _isInherited = true;
+      : _isInherited = true,
+        super(library, packageGraph, originalMember) {
     _calcTypeParameters();
   }
 
@@ -51,11 +57,8 @@ class Method extends ModelElement
   }
 
   @override
-  Container get enclosingElement {
-    _enclosingContainer ??=
-        modelBuilder.from(element.enclosingElement3, library) as Container?;
-    return _enclosingContainer!;
-  }
+  Container get enclosingElement => _enclosingContainer ??=
+      modelBuilder.from(element.enclosingElement3, library) as Container;
 
   @override
   String get filePath =>
@@ -119,9 +122,6 @@ class Method extends ModelElement
     return null;
   }
 
-  @override
-  MethodElement get element => super.element as MethodElement;
-
   /// Methods can not be covariant; always returns false.
   @override
   bool get isCovariant => false;