1 files changed, 138 insertions, 0 deletions
diff --git a/dom/base/StaticRange.h b/dom/base/StaticRange.h
new file mode 100644
index 0000000000..a6f677130d
--- /dev/null
+++ b/dom/base/StaticRange.h
@@ -0,0 +1,138 @@
+/* -*- 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_StaticRange_h
+#define mozilla_dom_StaticRange_h
+
+#include "mozilla/RangeBoundary.h"
+#include "mozilla/dom/AbstractRange.h"
+#include "mozilla/dom/StaticRangeBinding.h"
+#include "nsTArray.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class StaticRange final : public AbstractRange {
+ public:
+  StaticRange() = delete;
+  explicit StaticRange(const StaticRange& aOther) = delete;
+
+  static already_AddRefed<StaticRange> Constructor(const GlobalObject& global,
+                                                   const StaticRangeInit& init,
+                                                   ErrorResult& aRv);
+
+  /**
+   * The following Create() returns `nsRange` instance which is initialized
+   * only with aNode.  The result is never positioned.
+   */
+  static already_AddRefed<StaticRange> Create(nsINode* aNode);
+
+  /**
+   * Create() may return `StaticRange` instance which is initialized with
+   * given range or points.  If it fails initializing new range with the
+   * arguments, returns `nullptr`.  `ErrorResult` is set to an error only
+   * when this returns `nullptr`.  The error code indicates the reason why
+   * it couldn't initialize the instance.
+   */
+  static already_AddRefed<StaticRange> Create(
+      const AbstractRange* aAbstractRange, ErrorResult& aRv) {
+    MOZ_ASSERT(aAbstractRange);
+    return StaticRange::Create(aAbstractRange->StartRef(),
+                               aAbstractRange->EndRef(), aRv);
+  }
+  static already_AddRefed<StaticRange> Create(nsINode* aStartContainer,
+                                              uint32_t aStartOffset,
+                                              nsINode* aEndContainer,
+                                              uint32_t aEndOffset,
+                                              ErrorResult& aRv) {
+    return StaticRange::Create(
+        RawRangeBoundary(aStartContainer, aStartOffset,
+                         RangeBoundaryIsMutationObserved::No),
+        RawRangeBoundary(aEndContainer, aEndOffset,
+                         RangeBoundaryIsMutationObserved::No),
+        aRv);
+  }
+  template <typename SPT, typename SRT, typename EPT, typename ERT>
+  static already_AddRefed<StaticRange> Create(
+      const RangeBoundaryBase<SPT, SRT>& aStartBoundary,
+      const RangeBoundaryBase<EPT, ERT>& aEndBoundary, ErrorResult& aRv);
+
+  /**
+   * Returns true if the range is valid.
+   *
+   * @see https://dom.spec.whatwg.org/#staticrange-valid
+   */
+  bool IsValid() const;
+
+ protected:
+  explicit StaticRange(nsINode* aNode)
+      : AbstractRange(aNode, /* aIsDynamicRange = */ false) {}
+  virtual ~StaticRange();
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_IMETHODIMP_(void) DeleteCycleCollectable(void) override;
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(StaticRange,
+                                                         AbstractRange)
+
+  JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
+
+  /**
+   * SetStartAndEnd() works similar to call both SetStart() and SetEnd().
+   * Different from calls them separately, this does nothing if either
+   * the start point or the end point is invalid point.
+   * If the specified start point is after the end point, the range will be
+   * collapsed at the end point.  Similarly, if they are in different root,
+   * the range will be collapsed at the end point.
+   */
+  nsresult SetStartAndEnd(nsINode* aStartContainer, uint32_t aStartOffset,
+                          nsINode* aEndContainer, uint32_t aEndOffset) {
+    return SetStartAndEnd(RawRangeBoundary(aStartContainer, aStartOffset),
+                          RawRangeBoundary(aEndContainer, aEndOffset));
+  }
+  template <typename SPT, typename SRT, typename EPT, typename ERT>
+  nsresult SetStartAndEnd(const RangeBoundaryBase<SPT, SRT>& aStartBoundary,
+                          const RangeBoundaryBase<EPT, ERT>& aEndBoundary) {
+    return AbstractRange::SetStartAndEndInternal(aStartBoundary, aEndBoundary,
+                                                 this);
+  }
+
+ protected:
+  /**
+   * 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.
+   */
+  template <typename SPT, typename SRT, typename EPT, typename ERT>
+  void DoSetRange(const RangeBoundaryBase<SPT, SRT>& aStartBoundary,
+                  const RangeBoundaryBase<EPT, ERT>& aEndBoundary,
+                  nsINode* aRootNode);
+
+  static nsTArray<RefPtr<StaticRange>>* sCachedRanges;
+
+  friend class AbstractRange;
+};
+
+inline StaticRange* AbstractRange::AsStaticRange() {
+  MOZ_ASSERT(IsStaticRange());
+  return static_cast<StaticRange*>(this);
+}
+inline const StaticRange* AbstractRange::AsStaticRange() const {
+  MOZ_ASSERT(IsStaticRange());
+  return static_cast<const StaticRange*>(this);
+}
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // #ifndef mozilla_dom_StaticRange_h