From 53c9b77ed41aebb157012eff5e57cad3a962d18e Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Sat, 4 Jan 2020 23:29:10 -0500
Subject: Bug 1315885 - Part 4: Implement callback reaction for custom element
 reactions.

Note: Skipped SyncInvokeReactions since it is removed in CE v1, waste of time.

Tag UXP Issue #1344
---
 dom/base/CustomElementRegistry.h | 67 ++++++++++++++++++++++++----------------
 1 file changed, 40 insertions(+), 27 deletions(-)

(limited to 'dom/base/CustomElementRegistry.h')

diff --git a/dom/base/CustomElementRegistry.h b/dom/base/CustomElementRegistry.h
index cb7bd67a5..33f2a95ff 100644
--- a/dom/base/CustomElementRegistry.h
+++ b/dom/base/CustomElementRegistry.h
@@ -84,23 +84,14 @@ struct CustomElementData
 
   explicit CustomElementData(nsIAtom* aType);
   CustomElementData(nsIAtom* aType, State aState);
-  // Objects in this array are transient and empty after each microtask
-  // checkpoint.
-  nsTArray<nsAutoPtr<CustomElementCallback>> mCallbackQueue;
   // Custom element type, for <button is="x-button"> or <x-button>
   // this would be x-button.
   nsCOMPtr<nsIAtom> mType;
-  // The callback that is next to be processed upon calling RunCallbackQueue.
-  int32_t mCurrentCallback;
   // Element is being created flag as described in the custom elements spec.
   bool mElementIsBeingCreated;
   // Flag to determine if the created callback has been invoked, thus it
   // determines if other callbacks can be enqueued.
   bool mCreatedCallbackInvoked;
-  // The microtask level associated with the callbacks in the callback queue,
-  // it is used to determine if a new queue needs to be pushed onto the
-  // processing stack.
-  int32_t mAssociatedMicroTask;
   // Custom element state as described in the custom element spec.
   State mState;
   // custom element reaction queue as described in the custom element spec.
@@ -109,10 +100,7 @@ struct CustomElementData
   // appended, removed, or replaced.
   // There are 3 reactions in reaction queue when doing upgrade operation,
   // e.g., create an element, insert a node.
-  AutoTArray<nsAutoPtr<CustomElementReaction>, 3> mReactionQueue;
-
-  // Empties the callback queue.
-  void RunCallbackQueue();
+  AutoTArray<UniquePtr<CustomElementReaction>, 3> mReactionQueue;
 
 private:
   virtual ~CustomElementData() {}
@@ -142,7 +130,7 @@ struct CustomElementDefinition
   JS::Heap<JSObject *> mPrototype;
 
   // The lifecycle callbacks to call for this custom element.
-  nsAutoPtr<mozilla::dom::LifecycleCallbacks> mCallbacks;
+  UniquePtr<mozilla::dom::LifecycleCallbacks> mCallbacks;
 
   // A construction stack.
   // TODO: Bug 1287348 - Implement construction stack for upgrading an element
@@ -163,10 +151,13 @@ public:
     : mRegistry(aRegistry)
     , mDefinition(aDefinition)
   {
-  };
+  }
 
   virtual ~CustomElementReaction() = default;
   virtual void Invoke(Element* aElement) = 0;
+  virtual void Traverse(nsCycleCollectionTraversalCallback& aCb) const
+  {
+  }
 
 protected:
   CustomElementRegistry* mRegistry;
@@ -186,6 +177,27 @@ private:
    virtual void Invoke(Element* aElement) override;
 };
 
+class CustomElementCallbackReaction final : public CustomElementReaction
+{
+  public:
+    CustomElementCallbackReaction(CustomElementRegistry* aRegistry,
+                                  CustomElementDefinition* aDefinition,
+                                  UniquePtr<CustomElementCallback> aCustomElementCallback)
+      : CustomElementReaction(aRegistry, aDefinition)
+      , mCustomElementCallback(Move(aCustomElementCallback))
+    {
+    }
+
+    virtual void Traverse(nsCycleCollectionTraversalCallback& aCb) const override
+    {
+      mCustomElementCallback->Traverse(aCb);
+    }
+
+  private:
+    virtual void Invoke(Element* aElement) override;
+    UniquePtr<CustomElementCallback> mCustomElementCallback;
+};
+
 // https://html.spec.whatwg.org/multipage/scripting.html#custom-element-reactions-stack
 class CustomElementReactionsStack
 {
@@ -211,6 +223,15 @@ public:
                               Element* aElement,
                               CustomElementDefinition* aDefinition);
 
+  /**
+   * Enqueue a custom element callback reaction
+   * https://html.spec.whatwg.org/multipage/scripting.html#enqueue-a-custom-element-callback-reaction
+   */
+  void EnqueueCallbackReaction(CustomElementRegistry* aRegistry,
+                               Element* aElement,
+                               CustomElementDefinition* aDefinition,
+                               UniquePtr<CustomElementCallback> aCustomElementCallback);
+
   // [CEReactions] Before executing the algorithm's steps
   // Push a new element queue onto the custom element reactions stack.
   void CreateAndPushElementQueue();
@@ -276,10 +297,6 @@ public:
   static bool IsCustomElementEnabled(JSContext* aCx = nullptr,
                                      JSObject* aObject = nullptr);
 
-  static void ProcessTopElementQueue();
-
-  static void XPCOMShutdown();
-
   explicit CustomElementRegistry(nsPIDOMWindowInner* aWindow);
 
   /**
@@ -312,6 +329,10 @@ public:
 private:
   ~CustomElementRegistry();
 
+  UniquePtr<CustomElementCallback> CreateCustomElementCallback(
+    nsIDocument::ElementCallbackType aType, Element* aCustomElement,
+    LifecycleCallbackArgs* aArgs, CustomElementDefinition* aDefinition);
+
   /**
    * Registers an unresolved custom element that is a candidate for
    * upgrade when the definition is registered via registerElement.
@@ -358,14 +379,6 @@ private:
 
   nsCOMPtr<nsPIDOMWindowInner> mWindow;
 
-  // Array representing the processing stack in the custom elements
-  // specification. The processing stack is conceptually a stack of
-  // element queues. Each queue is represented by a sequence of
-  // CustomElementData in this array, separated by nullptr that
-  // represent the boundaries of the items in the stack. The first
-  // queue in the stack is the base element queue.
-  static mozilla::Maybe<nsTArray<RefPtr<CustomElementData>>> sProcessingStack;
-
   // It is used to prevent reentrant invocations of element definition.
   bool mIsCustomDefinitionRunning;
 
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