Bug 1396584 - Remove support for multiple ShadowRoots

Tag #1375

6 files changed, 2 insertions, 472 deletions

diff --git a/dom/html/HTMLShadowElement.cpp b/dom/html/HTMLShadowElement.cpp
deleted file mode 100644
index 8824c2875..000000000
--- a/dom/html/HTMLShadowElement.cpp
+++ /dev/null
@@ -1,373 +0,0 @@
-/* -*- 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/. */
-
-#include "mozilla/dom/ShadowRoot.h"
-
-#include "ChildIterator.h"
-#include "nsContentUtils.h"
-#include "nsDocument.h"
-#include "mozilla/dom/HTMLShadowElement.h"
-#include "mozilla/dom/HTMLUnknownElement.h"
-#include "mozilla/dom/HTMLShadowElementBinding.h"
-
-// Expand NS_IMPL_NS_NEW_HTML_ELEMENT(Shadow) to add check for web components
-// being enabled.
-nsGenericHTMLElement*
-NS_NewHTMLShadowElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
-                        mozilla::dom::FromParser aFromParser)
-{
-  // When this check is removed, remove the nsDocument.h and
-  // HTMLUnknownElement.h includes.  Also remove nsINode::IsHTMLShadowElement.
-  //
-  // We have to jump through some hoops to be able to produce both NodeInfo* and
-  // already_AddRefed<NodeInfo>& for our callees.
-  RefPtr<mozilla::dom::NodeInfo> nodeInfo(aNodeInfo);
-  if (!nsDocument::IsWebComponentsEnabled(nodeInfo)) {
-    already_AddRefed<mozilla::dom::NodeInfo> nodeInfoArg(nodeInfo.forget());
-    return new mozilla::dom::HTMLUnknownElement(nodeInfoArg);
-  }
-
-  already_AddRefed<mozilla::dom::NodeInfo> nodeInfoArg(nodeInfo.forget());
-  return new mozilla::dom::HTMLShadowElement(nodeInfoArg);
-}
-
-using namespace mozilla::dom;
-
-HTMLShadowElement::HTMLShadowElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
-  : nsGenericHTMLElement(aNodeInfo), mIsInsertionPoint(false)
-{
-}
-
-HTMLShadowElement::~HTMLShadowElement()
-{
-  if (mProjectedShadow) {
-    mProjectedShadow->RemoveMutationObserver(this);
-  }
-}
-
-NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLShadowElement)
-
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLShadowElement,
-                                                  nsGenericHTMLElement)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mProjectedShadow)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
-
-NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLShadowElement,
-                                                nsGenericHTMLElement)
-  if (tmp->mProjectedShadow) {
-    tmp->mProjectedShadow->RemoveMutationObserver(tmp);
-    tmp->mProjectedShadow = nullptr;
-  }
-NS_IMPL_CYCLE_COLLECTION_UNLINK_END
-
-NS_IMPL_ADDREF_INHERITED(HTMLShadowElement, Element)
-NS_IMPL_RELEASE_INHERITED(HTMLShadowElement, Element)
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(HTMLShadowElement)
-NS_INTERFACE_MAP_END_INHERITING(nsGenericHTMLElement)
-
-NS_IMPL_ELEMENT_CLONE(HTMLShadowElement)
-
-JSObject*
-HTMLShadowElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
-{
-  return HTMLShadowElementBinding::Wrap(aCx, this, aGivenProto);
-}
-
-void
-HTMLShadowElement::SetProjectedShadow(ShadowRoot* aProjectedShadow)
-{
-  if (mProjectedShadow) {
-    mProjectedShadow->RemoveMutationObserver(this);
-
-    // The currently projected ShadowRoot is going away,
-    // thus the destination insertion points need to be updated.
-    ExplicitChildIterator childIterator(mProjectedShadow);
-    for (nsIContent* content = childIterator.GetNextChild();
-         content;
-         content = childIterator.GetNextChild()) {
-      ShadowRoot::RemoveDestInsertionPoint(this, content->DestInsertionPoints());
-    }
-  }
-
-  mProjectedShadow = aProjectedShadow;
-  if (mProjectedShadow) {
-    // A new ShadowRoot is being projected, thus its explcit
-    // children will be distributed to this shadow insertion point.
-    ExplicitChildIterator childIterator(mProjectedShadow);
-    for (nsIContent* content = childIterator.GetNextChild();
-         content;
-         content = childIterator.GetNextChild()) {
-      content->DestInsertionPoints().AppendElement(this);
-    }
-
-    // Watch for mutations on the projected shadow because
-    // it affects the nodes that are distributed to this shadow
-    // insertion point.
-    mProjectedShadow->AddMutationObserver(this);
-  }
-}
-
-static bool
-IsInFallbackContent(nsIContent* aContent)
-{
-  nsINode* parentNode = aContent->GetParentNode();
-  while (parentNode) {
-    if (parentNode->IsHTMLElement(nsGkAtoms::content)) {
-      return true;
-    }
-    parentNode = parentNode->GetParentNode();
-  }
-
-  return false;
-}
-
-nsresult
-HTMLShadowElement::BindToTree(nsIDocument* aDocument,
-                              nsIContent* aParent,
-                              nsIContent* aBindingParent,
-                              bool aCompileEventHandlers)
-{
-  RefPtr<ShadowRoot> oldContainingShadow = GetContainingShadow();
-
-  nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
-                                                 aBindingParent,
-                                                 aCompileEventHandlers);
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  ShadowRoot* containingShadow = GetContainingShadow();
-  if (containingShadow && !oldContainingShadow) {
-    // Keep track of all descendant <shadow> elements in tree order so
-    // that when the current shadow insertion point is removed, the next
-    // one can be found quickly.
-    TreeOrderComparator comparator;
-    containingShadow->ShadowDescendants().InsertElementSorted(this, comparator);
-
-    if (containingShadow->ShadowDescendants()[0] != this) {
-      // Only the first <shadow> (in tree order) of a ShadowRoot can be an insertion point.
-      return NS_OK;
-    }
-
-    if (IsInFallbackContent(this)) {
-      // If the first shadow element in tree order is invalid (in fallback content),
-      // the containing ShadowRoot will not have a shadow insertion point.
-      containingShadow->SetShadowElement(nullptr);
-    } else {
-      mIsInsertionPoint = true;
-      containingShadow->SetShadowElement(this);
-    }
-
-    containingShadow->SetInsertionPointChanged();
-  }
-
-  if (mIsInsertionPoint && containingShadow) {
-    // Propagate BindToTree calls to projected shadow root children.
-    ShadowRoot* projectedShadow = containingShadow->GetOlderShadowRoot();
-    if (projectedShadow) {
-      projectedShadow->SetIsComposedDocParticipant(IsInComposedDoc());
-
-      for (nsIContent* child = projectedShadow->GetFirstChild(); child;
-           child = child->GetNextSibling()) {
-        rv = child->BindToTree(nullptr, projectedShadow,
-                               projectedShadow->GetBindingParent(),
-                               aCompileEventHandlers);
-        NS_ENSURE_SUCCESS(rv, rv);
-      }
-    }
-  }
-
-  return NS_OK;
-}
-
-void
-HTMLShadowElement::UnbindFromTree(bool aDeep, bool aNullParent)
-{
-  RefPtr<ShadowRoot> oldContainingShadow = GetContainingShadow();
-
-  if (mIsInsertionPoint && oldContainingShadow) {
-    // Propagate UnbindFromTree call to previous projected shadow
-    // root children.
-    ShadowRoot* projectedShadow = oldContainingShadow->GetOlderShadowRoot();
-    if (projectedShadow) {
-      for (nsIContent* child = projectedShadow->GetFirstChild(); child;
-           child = child->GetNextSibling()) {
-        child->UnbindFromTree(true, false);
-      }
-
-      projectedShadow->SetIsComposedDocParticipant(false);
-    }
-  }
-
-  nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
-
-  if (oldContainingShadow && !GetContainingShadow() && mIsInsertionPoint) {
-    nsTArray<HTMLShadowElement*>& shadowDescendants =
-      oldContainingShadow->ShadowDescendants();
-    shadowDescendants.RemoveElement(this);
-    oldContainingShadow->SetShadowElement(nullptr);
-
-    // Find the next shadow insertion point.
-    if (shadowDescendants.Length() > 0 &&
-        !IsInFallbackContent(shadowDescendants[0])) {
-      oldContainingShadow->SetShadowElement(shadowDescendants[0]);
-    }
-
-    oldContainingShadow->SetInsertionPointChanged();
-
-    mIsInsertionPoint = false;
-  }
-}
-
-void
-HTMLShadowElement::DistributeSingleNode(nsIContent* aContent)
-{
-  if (aContent->DestInsertionPoints().Contains(this)) {
-    // Node has already been distrbuted this this node,
-    // we are done.
-    return;
-  }
-
-  aContent->DestInsertionPoints().AppendElement(this);
-
-  // Handle the case where the shadow element is a child of
-  // a node with a ShadowRoot. The nodes that have been distributed to
-  // this shadow insertion point will need to be reprojected into the
-  // insertion points of the parent's ShadowRoot.
-  ShadowRoot* parentShadowRoot = GetParent()->GetShadowRoot();
-  if (parentShadowRoot) {
-    parentShadowRoot->DistributeSingleNode(aContent);
-    return;
-  }
-
-  // Handle the case where the parent of this shadow element is a ShadowRoot
-  // that is projected into a shadow insertion point in the younger ShadowRoot.
-  ShadowRoot* containingShadow = GetContainingShadow();
-  ShadowRoot* youngerShadow = containingShadow->GetYoungerShadowRoot();
-  if (youngerShadow && GetParent() == containingShadow) {
-    HTMLShadowElement* youngerShadowElement = youngerShadow->GetShadowElement();
-    if (youngerShadowElement) {
-      youngerShadowElement->DistributeSingleNode(aContent);
-    }
-  }
-}
-
-void
-HTMLShadowElement::RemoveDistributedNode(nsIContent* aContent)
-{
-  ShadowRoot::RemoveDestInsertionPoint(this, aContent->DestInsertionPoints());
-
-  // Handle the case where the shadow element is a child of
-  // a node with a ShadowRoot. The nodes that have been distributed to
-  // this shadow insertion point will need to be removed from the
-  // insertion points of the parent's ShadowRoot.
-  ShadowRoot* parentShadowRoot = GetParent()->GetShadowRoot();
-  if (parentShadowRoot) {
-    parentShadowRoot->RemoveDistributedNode(aContent);
-    return;
-  }
-
-  // Handle the case where the parent of this shadow element is a ShadowRoot
-  // that is projected into a shadow insertion point in the younger ShadowRoot.
-  ShadowRoot* containingShadow = GetContainingShadow();
-  ShadowRoot* youngerShadow = containingShadow->GetYoungerShadowRoot();
-  if (youngerShadow && GetParent() == containingShadow) {
-    HTMLShadowElement* youngerShadowElement = youngerShadow->GetShadowElement();
-    if (youngerShadowElement) {
-      youngerShadowElement->RemoveDistributedNode(aContent);
-    }
-  }
-}
-
-void
-HTMLShadowElement::DistributeAllNodes()
-{
-  // All the explicit children of the projected ShadowRoot are distributed
-  // into this shadow insertion point so update the destination insertion
-  // points.
-  ShadowRoot* containingShadow = GetContainingShadow();
-  ShadowRoot* olderShadow = containingShadow->GetOlderShadowRoot();
-  if (olderShadow) {
-    ExplicitChildIterator childIterator(olderShadow);
-    for (nsIContent* content = childIterator.GetNextChild();
-         content;
-         content = childIterator.GetNextChild()) {
-      ShadowRoot::RemoveDestInsertionPoint(this, content->DestInsertionPoints());
-      content->DestInsertionPoints().AppendElement(this);
-    }
-  }
-
-  // Handle the case where the shadow element is a child of
-  // a node with a ShadowRoot. The nodes that have been distributed to
-  // this shadow insertion point will need to be reprojected into the
-  // insertion points of the parent's ShadowRoot.
-  ShadowRoot* parentShadowRoot = GetParent()->GetShadowRoot();
-  if (parentShadowRoot) {
-    parentShadowRoot->DistributeAllNodes();
-    return;
-  }
-
-  // Handle the case where the parent of this shadow element is a ShadowRoot
-  // that is projected into a shadow insertion point in the younger ShadowRoot.
-  ShadowRoot* youngerShadow = containingShadow->GetYoungerShadowRoot();
-  if (youngerShadow && GetParent() == containingShadow) {
-    HTMLShadowElement* youngerShadowElement = youngerShadow->GetShadowElement();
-    if (youngerShadowElement) {
-      youngerShadowElement->DistributeAllNodes();
-    }
-  }
-}
-
-void
-HTMLShadowElement::ContentAppended(nsIDocument* aDocument,
-                                   nsIContent* aContainer,
-                                   nsIContent* aFirstNewContent,
-                                   int32_t aNewIndexInContainer)
-{
-  // Watch for content appended to the projected shadow (the ShadowRoot that
-  // will be rendered in place of this shadow insertion point) because the
-  // nodes may need to be distributed into other insertion points.
-  nsIContent* currentChild = aFirstNewContent;
-  while (currentChild) {
-    if (ShadowRoot::IsPooledNode(currentChild, aContainer, mProjectedShadow)) {
-      DistributeSingleNode(currentChild);
-    }
-    currentChild = currentChild->GetNextSibling();
-  }
-}
-
-void
-HTMLShadowElement::ContentInserted(nsIDocument* aDocument,
-                                   nsIContent* aContainer,
-                                   nsIContent* aChild,
-                                   int32_t aIndexInContainer)
-{
-  // Watch for content appended to the projected shadow (the ShadowRoot that
-  // will be rendered in place of this shadow insertion point) because the
-  // nodes may need to be distributed into other insertion points.
-  if (!ShadowRoot::IsPooledNode(aChild, aContainer, mProjectedShadow)) {
-    return;
-  }
-
-  DistributeSingleNode(aChild);
-}
-
-void
-HTMLShadowElement::ContentRemoved(nsIDocument* aDocument,
-                                  nsIContent* aContainer,
-                                  nsIContent* aChild,
-                                  int32_t aIndexInContainer,
-                                  nsIContent* aPreviousSibling)
-{
-  // Watch for content removed from the projected shadow (the ShadowRoot that
-  // will be rendered in place of this shadow insertion point) because the
-  // nodes may need to be removed from other insertion points.
-  if (!ShadowRoot::IsPooledNode(aChild, aContainer, mProjectedShadow)) {
-    return;
-  }
-
-  RemoveDistributedNode(aChild);
-}
-
diff --git a/dom/html/HTMLShadowElement.h b/dom/html/HTMLShadowElement.h
deleted file mode 100644
index 95083b802..000000000
--- a/dom/html/HTMLShadowElement.h
+++ /dev/null
@@ -1,96 +0,0 @@
-/* -*- 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/. */
-
-#ifndef mozilla_dom_HTMLShadowElement_h__
-#define mozilla_dom_HTMLShadowElement_h__
-
-#include "nsGenericHTMLElement.h"
-
-namespace mozilla {
-namespace dom {
-
-class HTMLShadowElement final : public nsGenericHTMLElement,
-                                public nsStubMutationObserver
-{
-public:
-  explicit HTMLShadowElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
-
-  // nsISupports
-  NS_DECL_ISUPPORTS_INHERITED
-
-  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
-  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
-  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
-
-  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLShadowElement,
-                                           nsGenericHTMLElement)
-
-  static HTMLShadowElement* FromContent(nsIContent* aContent)
-  {
-    if (aContent->IsHTMLShadowElement()) {
-      return static_cast<HTMLShadowElement*>(aContent);
-    }
-
-    return nullptr;
-  }
-
-  virtual bool IsHTMLShadowElement() const override { return true; }
-
-  virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const override;
-
-  virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
-                              nsIContent* aBindingParent,
-                              bool aCompileEventHandlers) override;
-
-  virtual void UnbindFromTree(bool aDeep = true,
-                              bool aNullParent = true) override;
-
-  bool IsInsertionPoint() { return mIsInsertionPoint; }
-
-  /**
-   * Sets the ShadowRoot that will be rendered in place of
-   * this shadow insertion point.
-   */
-  void SetProjectedShadow(ShadowRoot* aProjectedShadow);
-
-  /**
-   * Distributes a single explicit child of the projected ShadowRoot
-   * to relevant insertion points.
-   */
-  void DistributeSingleNode(nsIContent* aContent);
-
-  /**
-   * Removes a single explicit child of the projected ShadowRoot
-   * from relevant insertion points.
-   */
-  void RemoveDistributedNode(nsIContent* aContent);
-
-  /**
-   * Distributes all the explicit children of the projected ShadowRoot
-   * to the shadow insertion point in the younger ShadowRoot and
-   * the content insertion point of the parent node's ShadowRoot.
-   */
-  void DistributeAllNodes();
-
-  // WebIDL methods.
-  ShadowRoot* GetOlderShadowRoot() { return mProjectedShadow; }
-
-protected:
-  virtual ~HTMLShadowElement();
-
-  virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;
-
-  // The ShadowRoot that will be rendered in place of this shadow insertion point.
-  RefPtr<ShadowRoot> mProjectedShadow;
-
-  bool mIsInsertionPoint;
-};
-
-} // namespace dom
-} // namespace mozilla
-
-#endif // mozilla_dom_HTMLShadowElement_h__
-
diff --git a/dom/html/moz.build b/dom/html/moz.build
index c86c169b5..1ccc630fd 100644
--- a/dom/html/moz.build
+++ b/dom/html/moz.build
@@ -92,7 +92,6 @@ EXPORTS.mozilla.dom += [
     'HTMLProgressElement.h',
     'HTMLScriptElement.h',
     'HTMLSelectElement.h',
-    'HTMLShadowElement.h',
     'HTMLSharedElement.h',
     'HTMLSharedListElement.h',
     'HTMLSharedObjectElement.h',
@@ -172,7 +171,6 @@ UNIFIED_SOURCES += [
     'HTMLProgressElement.cpp',
     'HTMLScriptElement.cpp',
     'HTMLSelectElement.cpp',
-    'HTMLShadowElement.cpp',
     'HTMLSharedElement.cpp',
     'HTMLSharedListElement.cpp',
     'HTMLSharedObjectElement.cpp',
diff --git a/dom/html/nsGenericHTMLElement.h b/dom/html/nsGenericHTMLElement.h
index 16f438acc..3b451b29c 100644
--- a/dom/html/nsGenericHTMLElement.h
+++ b/dom/html/nsGenericHTMLElement.h
@@ -1700,7 +1700,6 @@ NS_DECLARE_NS_NEW_HTML_ELEMENT(Pre)
 NS_DECLARE_NS_NEW_HTML_ELEMENT(Progress)
 NS_DECLARE_NS_NEW_HTML_ELEMENT(Script)
 NS_DECLARE_NS_NEW_HTML_ELEMENT(Select)
-NS_DECLARE_NS_NEW_HTML_ELEMENT(Shadow)
 NS_DECLARE_NS_NEW_HTML_ELEMENT(Source)
 NS_DECLARE_NS_NEW_HTML_ELEMENT(Span)
 NS_DECLARE_NS_NEW_HTML_ELEMENT(Style)
diff --git a/dom/html/nsGenericHTMLFrameElement.cpp b/dom/html/nsGenericHTMLFrameElement.cpp
index 03e6ffb42..8170179e2 100644
--- a/dom/html/nsGenericHTMLFrameElement.cpp
+++ b/dom/html/nsGenericHTMLFrameElement.cpp
@@ -27,6 +27,7 @@
 #include "nsServiceManagerUtils.h"
 #include "nsSubDocumentFrame.h"
 #include "nsXULElement.h"
+#include "nsAttrValueOrString.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
diff --git a/dom/html/nsHTMLContentSink.cpp b/dom/html/nsHTMLContentSink.cpp
index 1c390a53e..eb22b772f 100644
--- a/dom/html/nsHTMLContentSink.cpp
+++ b/dom/html/nsHTMLContentSink.cpp
@@ -31,6 +31,7 @@
 #include "mozilla/Logging.h"
 #include "nsNodeUtils.h"
 #include "nsIContent.h"
+#include "mozilla/dom/CustomElementRegistry.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/Preferences.h"