1 files changed, 89 insertions, 0 deletions
diff --git a/dom/base/CrossShadowBoundaryRange.h b/dom/base/CrossShadowBoundaryRange.h
new file mode 100644
index 0000000000..3ad4fa1793
--- /dev/null
+++ b/dom/base/CrossShadowBoundaryRange.h
@@ -0,0 +1,89 @@
+/* -*- 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_CrossShadowBoundaryRange_h
+#define mozilla_dom_CrossShadowBoundaryRange_h
+
+#include "mozilla/RangeBoundary.h"
+#include "mozilla/RangeUtils.h"
+#include "mozilla/dom/AbstractRange.h"
+#include "mozilla/dom/StaticRange.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class CrossShadowBoundaryRange final : public StaticRange {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_IMETHODIMP_(void) DeleteCycleCollectable(void) override;
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(
+      CrossShadowBoundaryRange, StaticRange)
+
+  CrossShadowBoundaryRange() = delete;
+  explicit CrossShadowBoundaryRange(const StaticRange& aOther) = delete;
+
+  template <typename SPT, typename SRT, typename EPT, typename ERT>
+  static already_AddRefed<CrossShadowBoundaryRange> Create(
+      const RangeBoundaryBase<SPT, SRT>& aStartBoundary,
+      const RangeBoundaryBase<EPT, ERT>& aEndBoundary);
+
+  void NotifyNodeBecomesShadowHost(nsINode* aNode) {
+    if (aNode == mStart.Container()) {
+      mStart.NotifyParentBecomesShadowHost();
+    }
+
+    if (aNode == mEnd.Container()) {
+      mEnd.NotifyParentBecomesShadowHost();
+    }
+  }
+
+  nsINode* GetCommonAncestor() const { return mCommonAncestor; }
+
+  // CrossShadowBoundaryRange should have a very limited usage.
+  nsresult SetStartAndEnd(nsINode* aStartContainer, uint32_t aStartOffset,
+                          nsINode* aEndContainer, uint32_t aEndOffset) = delete;
+
+  template <typename SPT, typename SRT, typename EPT, typename ERT>
+  nsresult SetStartAndEnd(const RangeBoundaryBase<SPT, SRT>& aStartBoundary,
+                          const RangeBoundaryBase<EPT, ERT>& aEndBoundary) {
+    return StaticRange::SetStartAndEnd(aStartBoundary, aEndBoundary);
+  }
+
+ private:
+  explicit CrossShadowBoundaryRange(nsINode* aNode) : StaticRange(aNode) {}
+  virtual ~CrossShadowBoundaryRange() = default;
+
+  /**
+   * DoSetRange() is called when `AbstractRange::SetStartAndEndInternal()` sets
+   * mStart and mEnd.
+   *
+   * @param aStartBoundary  Computed start point.  This must equals or be before
+   *                        aEndBoundary in the DOM tree order.
+   * @param aEndBoundary    Computed end point.
+   * @param aRootNode       The root node of aStartBoundary or aEndBoundary.
+   *                        It's useless to CrossShadowBoundaryRange.
+   */
+  template <typename SPT, typename SRT, typename EPT, typename ERT>
+  void DoSetRange(const RangeBoundaryBase<SPT, SRT>& aStartBoundary,
+                  const RangeBoundaryBase<EPT, ERT>& aEndBoundary,
+                  nsINode* aRootNode);
+
+  // This is either NULL if this CrossShadowBoundaryRange has been
+  // reset by Release() or the closest common shadow-including ancestor
+  // of mStart and mEnd.
+  nsCOMPtr<nsINode> mCommonAncestor;
+
+  static nsTArray<RefPtr<CrossShadowBoundaryRange>>* sCachedRanges;
+
+  friend class AbstractRange;
+};
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // #ifndef mozilla_dom_CrossShadowBoundaryRange_h