1 files changed, 254 insertions, 0 deletions
diff --git a/dom/base/nsIContentInlines.h b/dom/base/nsIContentInlines.h
new file mode 100644
index 0000000000..89cc7b9c30
--- /dev/null
+++ b/dom/base/nsIContentInlines.h
@@ -0,0 +1,254 @@
+/* -*- 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 nsIContentInlines_h
+#define nsIContentInlines_h
+
+#include "nsIContent.h"
+#include "mozilla/dom/Document.h"
+#include "nsContentUtils.h"
+#include "nsAtom.h"
+#include "nsIFrame.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLSlotElement.h"
+#include "mozilla/dom/ShadowRoot.h"
+
+inline bool nsIContent::IsInHTMLDocument() const {
+  return OwnerDoc()->IsHTMLDocument();
+}
+
+inline bool nsIContent::IsInChromeDocument() const {
+  return nsContentUtils::IsChromeDoc(OwnerDoc());
+}
+
+inline void nsIContent::SetPrimaryFrame(nsIFrame* aFrame) {
+  MOZ_ASSERT(IsInUncomposedDoc() || IsInShadowTree(), "This will end badly!");
+
+  // <area> is known to trigger this, see bug 749326 and bug 135040.
+  MOZ_ASSERT(IsHTMLElement(nsGkAtoms::area) || !aFrame || !mPrimaryFrame ||
+                 aFrame == mPrimaryFrame,
+             "Losing track of existing primary frame");
+
+  if (aFrame) {
+    MOZ_ASSERT(!aFrame->IsPlaceholderFrame());
+    if (MOZ_LIKELY(!IsHTMLElement(nsGkAtoms::area)) ||
+        aFrame->GetContent() == this) {
+      aFrame->SetIsPrimaryFrame(true);
+    }
+  } else if (nsIFrame* currentPrimaryFrame = GetPrimaryFrame()) {
+    if (MOZ_LIKELY(!IsHTMLElement(nsGkAtoms::area)) ||
+        currentPrimaryFrame->GetContent() == this) {
+      currentPrimaryFrame->SetIsPrimaryFrame(false);
+    }
+  }
+
+  mPrimaryFrame = aFrame;
+}
+
+inline mozilla::dom::ShadowRoot* nsIContent::GetShadowRoot() const {
+  if (!IsElement()) {
+    return nullptr;
+  }
+
+  return AsElement()->GetShadowRoot();
+}
+
+template <nsINode::FlattenedParentType aType>
+static inline nsINode* GetFlattenedTreeParentNode(const nsINode* aNode) {
+  if (!aNode->IsContent()) {
+    return nullptr;
+  }
+
+  nsINode* parent = aNode->GetParentNode();
+  if (!parent || !parent->IsContent()) {
+    return parent;
+  }
+
+  const nsIContent* content = aNode->AsContent();
+  nsIContent* parentAsContent = parent->AsContent();
+
+  if (aType == nsINode::eForStyle &&
+      content->IsRootOfNativeAnonymousSubtree() &&
+      parentAsContent == content->OwnerDoc()->GetRootElement()) {
+    const bool docLevel =
+        content->GetProperty(nsGkAtoms::docLevelNativeAnonymousContent);
+    return docLevel ? content->OwnerDocAsNode() : parent;
+  }
+
+  if (content->IsRootOfNativeAnonymousSubtree()) {
+    return parent;
+  }
+
+  if (parentAsContent->GetShadowRoot()) {
+    // If it's not assigned to any slot it's not part of the flat tree, and thus
+    // we return null.
+    return content->GetAssignedSlot();
+  }
+
+  if (parentAsContent->IsInShadowTree()) {
+    if (auto* slot = mozilla::dom::HTMLSlotElement::FromNode(parentAsContent)) {
+      // If the assigned nodes list is empty, we're fallback content which is
+      // active, otherwise we are not part of the flat tree.
+      return slot->AssignedNodes().IsEmpty() ? parent : nullptr;
+    }
+
+    if (auto* shadowRoot =
+            mozilla::dom::ShadowRoot::FromNode(parentAsContent)) {
+      return shadowRoot->GetHost();
+    }
+  }
+
+  // Common case.
+  return parent;
+}
+
+inline nsINode* nsINode::GetFlattenedTreeParentNode() const {
+  return ::GetFlattenedTreeParentNode<nsINode::eNotForStyle>(this);
+}
+
+inline nsIContent* nsIContent::GetFlattenedTreeParent() const {
+  nsINode* parent = GetFlattenedTreeParentNode();
+  return (parent && parent->IsContent()) ? parent->AsContent() : nullptr;
+}
+
+inline bool nsIContent::IsEventAttributeName(nsAtom* aName) {
+  const char16_t* name = aName->GetUTF16String();
+  if (name[0] != 'o' || name[1] != 'n') {
+    return false;
+  }
+
+  return IsEventAttributeNameInternal(aName);
+}
+
+inline nsINode* nsINode::GetFlattenedTreeParentNodeForStyle() const {
+  return ::GetFlattenedTreeParentNode<nsINode::eForStyle>(this);
+}
+
+inline bool nsINode::NodeOrAncestorHasDirAuto() const {
+  return AncestorHasDirAuto() || (IsElement() && AsElement()->HasDirAuto());
+}
+
+inline bool nsINode::IsEditable() const {
+  if (HasFlag(NODE_IS_EDITABLE)) {
+    // The node is in an editable contentEditable subtree.
+    return true;
+  }
+
+  // All editable anonymous content should be made explicitly editable via the
+  // NODE_IS_EDITABLE flag.
+  if (IsInNativeAnonymousSubtree()) {
+    return false;
+  }
+
+  // Check if the node is in a document and the document is in designMode.
+  return IsInDesignMode();
+}
+
+inline bool nsINode::IsEditingHost() const {
+  if (!IsInComposedDoc() || IsInDesignMode() || !IsEditable() ||
+      IsInNativeAnonymousSubtree()) {
+    return false;
+  }
+  nsIContent* const parent = GetParent();
+  return !parent ||  // The root element (IsInComposedDoc() is checked above)
+         !parent->IsEditable();  // or an editable node in a non-editable one
+}
+
+inline bool nsINode::IsInDesignMode() const {
+  if (!OwnerDoc()->HasFlag(NODE_IS_EDITABLE)) {
+    return false;
+  }
+
+  if (IsDocument()) {
+    return HasFlag(NODE_IS_EDITABLE);
+  }
+
+  // NOTE(emilio): If you change this to be the composed doc you also need to
+  // change NotifyEditableStateChange() in Document.cpp.
+  // NOTE(masayuki): Perhaps, we should keep this behavior because of
+  // web-compat.
+  if (IsInUncomposedDoc() && GetUncomposedDoc()->HasFlag(NODE_IS_EDITABLE)) {
+    return true;
+  }
+
+  // FYI: In design mode, form controls don't work as usual.  For example,
+  //      <input type=text> isn't focusable but can be deleted and replaced
+  //      with typed text. <select> is also not focusable but always selected
+  //      all to be deleted or replaced.  On the other hand, newer controls
+  //      don't behave as the traditional controls.  For example, data/time
+  //      picker can be opened and change the value from the picker.  And also
+  //      the buttons of <video controls> work as usual.  On the other hand,
+  //      their UI (i.e., nodes in their shadow tree) are not editable.
+  //      Therefore, we need special handling for nodes in anonymous subtree
+  //      unless we fix <https://bugzilla.mozilla.org/show_bug.cgi?id=1734512>.
+
+  // If the shadow host is not in design mode, this can never be in design
+  // mode.  Otherwise, the content is never editable by design mode of
+  // composed document. If we're in a native anonymous subtree, we should
+  // consider it with the host.
+  if (IsInNativeAnonymousSubtree()) {
+    nsIContent* host = GetClosestNativeAnonymousSubtreeRootParentOrHost();
+    MOZ_DIAGNOSTIC_ASSERT(host != this);
+    return host && host->IsInDesignMode();
+  }
+
+  // Otherwise, i.e., when it's in a shadow tree which is not created by us,
+  // the node is not editable by design mode (but it's possible that it may be
+  // editable if this node is in `contenteditable` element in the shadow tree).
+  return false;
+}
+
+inline void nsIContent::HandleInsertionToOrRemovalFromSlot() {
+  using mozilla::dom::HTMLSlotElement;
+
+  MOZ_ASSERT(GetParentElement());
+  if (!IsInShadowTree() || IsRootOfNativeAnonymousSubtree()) {
+    return;
+  }
+  HTMLSlotElement* slot = HTMLSlotElement::FromNode(mParent);
+  if (!slot) {
+    return;
+  }
+  // If parent's root is a shadow root, and parent is a slot whose
+  // assigned nodes is the empty list, then run signal a slot change for
+  // parent.
+  if (slot->AssignedNodes().IsEmpty()) {
+    slot->EnqueueSlotChangeEvent();
+  }
+}
+
+inline void nsIContent::HandleShadowDOMRelatedInsertionSteps(bool aHadParent) {
+  using mozilla::dom::Element;
+  using mozilla::dom::ShadowRoot;
+
+  if (!aHadParent) {
+    if (Element* parentElement = Element::FromNode(mParent)) {
+      if (ShadowRoot* shadow = parentElement->GetShadowRoot()) {
+        shadow->MaybeSlotHostChild(*this);
+      }
+      HandleInsertionToOrRemovalFromSlot();
+    }
+  }
+}
+
+inline void nsIContent::HandleShadowDOMRelatedRemovalSteps(bool aNullParent) {
+  using mozilla::dom::Element;
+  using mozilla::dom::ShadowRoot;
+
+  if (aNullParent) {
+    // FIXME(emilio, bug 1577141): FromNodeOrNull rather than just FromNode
+    // because XBL likes to call UnbindFromTree at very odd times (with already
+    // disconnected anonymous content subtrees).
+    if (Element* parentElement = Element::FromNodeOrNull(mParent)) {
+      if (ShadowRoot* shadow = parentElement->GetShadowRoot()) {
+        shadow->MaybeUnslotHostChild(*this);
+      }
+      HandleInsertionToOrRemovalFromSlot();
+    }
+  }
+}
+
+#endif  // nsIContentInlines_h