Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 201 insertions, 0 deletions

diff --git a/dom/base/nsStubMutationObserver.cpp b/dom/base/nsStubMutationObserver.cpp
new file mode 100644
index 0000000000..fcd8a8fdc5
--- /dev/null
+++ b/dom/base/nsStubMutationObserver.cpp
@@ -0,0 +1,201 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * nsStubMutationObserver is an implementation of the nsIMutationObserver
+ * interface (except for the methods on nsISupports) that is intended to be
+ * used as a base class within the content/layout library.  All methods do
+ * nothing.
+ */
+
+#include "nsStubMutationObserver.h"
+#include "mozilla/RefCountType.h"
+#include "nsISupports.h"
+#include "nsINode.h"
+
+/******************************************************************************
+ * nsStubMutationObserver
+ *****************************************************************************/
+
+NS_IMPL_NSIMUTATIONOBSERVER_CORE_STUB(nsStubMutationObserver)
+NS_IMPL_NSIMUTATIONOBSERVER_CONTENT(nsStubMutationObserver)
+
+/******************************************************************************
+ * MutationObserverWrapper
+ *****************************************************************************/
+
+/**
+ * @brief Wrapper class for a mutation observer that observes multiple nodes.
+ *
+ * This wrapper implements all methods of the nsIMutationObserver interface
+ * and forwards all calls to its owner, which is an instance of
+ * nsMultiMutationObserver.
+ *
+ * This class holds a reference to the owner and AddRefs/Releases its owner
+ * as well to ensure lifetime.
+ */
+class MutationObserverWrapper final : public nsIMutationObserver {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit MutationObserverWrapper(nsMultiMutationObserver* aOwner)
+      : mOwner(aOwner) {}
+
+  void CharacterDataWillChange(nsIContent* aContent,
+                               const CharacterDataChangeInfo& aInfo) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->CharacterDataWillChange(aContent, aInfo);
+  }
+
+  void CharacterDataChanged(nsIContent* aContent,
+                            const CharacterDataChangeInfo& aInfo) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->CharacterDataChanged(aContent, aInfo);
+  }
+
+  void AttributeWillChange(mozilla::dom::Element* aElement,
+                           int32_t aNameSpaceID, nsAtom* aAttribute,
+                           int32_t aModType) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->AttributeWillChange(aElement, aNameSpaceID, aAttribute, aModType);
+  }
+
+  void AttributeChanged(mozilla::dom::Element* aElement, int32_t aNameSpaceID,
+                        nsAtom* aAttribute, int32_t aModType,
+                        const nsAttrValue* aOldValue) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->AttributeChanged(aElement, aNameSpaceID, aAttribute, aModType,
+                             aOldValue);
+  }
+
+  void AttributeSetToCurrentValue(mozilla::dom::Element* aElement,
+                                  int32_t aNameSpaceID,
+                                  nsAtom* aAttribute) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->AttributeSetToCurrentValue(aElement, aNameSpaceID, aAttribute);
+  }
+
+  void ContentAppended(nsIContent* aFirstNewContent) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->ContentAppended(aFirstNewContent);
+  }
+
+  void ContentInserted(nsIContent* aChild) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->ContentInserted(aChild);
+  }
+
+  void ContentRemoved(nsIContent* aChild,
+                      nsIContent* aPreviousSibling) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->ContentRemoved(aChild, aPreviousSibling);
+  }
+
+  void NodeWillBeDestroyed(nsINode* aNode) override {
+    MOZ_ASSERT(mOwner);
+    AddRefWrapper();
+    RefPtr<nsMultiMutationObserver> owner = mOwner;
+    owner->NodeWillBeDestroyed(aNode);
+    owner->RemoveMutationObserverFromNode(aNode);
+    mOwner = nullptr;
+    ReleaseWrapper();
+  }
+
+  void ParentChainChanged(nsIContent* aContent) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->ParentChainChanged(aContent);
+  }
+
+  void ARIAAttributeDefaultWillChange(mozilla::dom::Element* aElement,
+                                      nsAtom* aAttribute,
+                                      int32_t aModType) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->ARIAAttributeDefaultWillChange(aElement, aAttribute, aModType);
+  }
+
+  void ARIAAttributeDefaultChanged(mozilla::dom::Element* aElement,
+                                   nsAtom* aAttribute,
+                                   int32_t aModType) override {
+    MOZ_ASSERT(mOwner);
+    mOwner->ARIAAttributeDefaultChanged(aElement, aAttribute, aModType);
+  }
+
+  MozExternalRefCountType AddRefWrapper() {
+    nsrefcnt count = ++mRefCnt;
+    NS_LOG_ADDREF(this, count, "MutationObserverWrapper", sizeof(*this));
+    return count;
+  }
+
+  MozExternalRefCountType ReleaseWrapper() {
+    --mRefCnt;
+    NS_LOG_RELEASE(this, mRefCnt, "MutationObserverWrapper");
+    if (mRefCnt == 0) {
+      mRefCnt = 1;
+      delete this;
+      return MozExternalRefCountType(0);
+    }
+    return mRefCnt;
+  }
+
+ private:
+  ~MutationObserverWrapper() = default;
+  nsMultiMutationObserver* mOwner{nullptr};
+};
+
+NS_IMPL_QUERY_INTERFACE(MutationObserverWrapper, nsIMutationObserver);
+
+MozExternalRefCountType MutationObserverWrapper::AddRef() {
+  MOZ_ASSERT(mOwner);
+  AddRefWrapper();
+  mOwner->AddRef();
+  return mRefCnt;
+}
+
+MozExternalRefCountType MutationObserverWrapper::Release() {
+  MOZ_ASSERT(mOwner);
+  mOwner->Release();
+  return ReleaseWrapper();
+}
+
+/******************************************************************************
+ * nsMultiMutationObserver
+ *****************************************************************************/
+
+void nsMultiMutationObserver::AddMutationObserverToNode(nsINode* aNode) {
+  if (!aNode) {
+    return;
+  }
+  if (mWrapperForNode.Contains(aNode)) {
+    return;
+  }
+  auto* newWrapper = new MutationObserverWrapper{this};
+  newWrapper->AddRefWrapper();
+  mWrapperForNode.InsertOrUpdate(aNode, newWrapper);
+  aNode->AddMutationObserver(newWrapper);
+}
+
+void nsMultiMutationObserver::RemoveMutationObserverFromNode(nsINode* aNode) {
+  if (!aNode) {
+    return;
+  }
+
+  if (auto obs = mWrapperForNode.MaybeGet(aNode); obs.isSome()) {
+    aNode->RemoveMutationObserver(*obs);
+    mWrapperForNode.Remove(aNode);
+    (*obs)->ReleaseWrapper();
+  }
+}
+
+bool nsMultiMutationObserver::ContainsNode(const nsINode* aNode) const {
+  return mWrapperForNode.Contains(const_cast<nsINode*>(aNode));
+}
+
+/******************************************************************************
+ * nsStubMultiMutationObserver
+ *****************************************************************************/
+
+NS_IMPL_NSIMUTATIONOBSERVER_CORE_STUB(nsStubMultiMutationObserver)
+NS_IMPL_NSIMUTATIONOBSERVER_CONTENT(nsStubMultiMutationObserver)