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diff --git a/layout/style/Rule.h b/layout/style/Rule.h
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+/* -*- 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/. */
+
+/* base class for all rule types in a CSS style sheet */
+
+#ifndef mozilla_css_Rule_h___
+#define mozilla_css_Rule_h___
+
+#include "mozilla/dom/CSSRuleBinding.h"
+#include "mozilla/dom/DocumentOrShadowRoot.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/MemoryReporting.h"
+#include "nsISupports.h"
+#include "nsWrapperCache.h"
+
+struct nsRuleData;
+template <class T>
+struct already_AddRefed;
+class nsHTMLCSSStyleSheet;
+
+namespace mozilla {
+
+enum class StyleCssRuleType : uint8_t;
+
+namespace css {
+class GroupRule;
+
+class Rule : public nsISupports, public nsWrapperCache {
+ protected:
+ Rule(StyleSheet* aSheet, Rule* aParentRule, uint32_t aLineNumber,
+ uint32_t aColumnNumber)
+ : mSheet(aSheet),
+ mParentRule(aParentRule),
+ mLineNumber(aLineNumber),
+ mColumnNumber(aColumnNumber) {
+#ifdef DEBUG
+ AssertParentRuleType();
+#endif
+ }
+
+#ifdef DEBUG
+ void AssertParentRuleType();
+#endif
+
+ Rule(const Rule& aCopy)
+ : mSheet(aCopy.mSheet),
+ mParentRule(aCopy.mParentRule),
+ mLineNumber(aCopy.mLineNumber),
+ mColumnNumber(aCopy.mColumnNumber) {}
+
+ virtual ~Rule() = default;
+
+ public:
+ NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+ NS_DECL_CYCLE_COLLECTION_SKIPPABLE_WRAPPERCACHE_CLASS(Rule)
+ // Return true if this rule is known to be a cycle collection leaf, in the
+ // sense that it doesn't have any outgoing owning edges.
+ virtual bool IsCCLeaf() const MOZ_MUST_OVERRIDE;
+
+#ifdef DEBUG
+ virtual void List(FILE* out = stdout, int32_t aIndent = 0) const = 0;
+#endif
+
+ StyleSheet* GetStyleSheet() const { return mSheet; }
+
+ // Clear the mSheet pointer on this rule and descendants.
+ virtual void DropSheetReference();
+
+ // Clear the mParentRule pointer on this rule.
+ void DropParentRuleReference() { mParentRule = nullptr; }
+
+ void DropReferences() {
+ DropSheetReference();
+ DropParentRuleReference();
+ }
+
+ uint32_t GetLineNumber() const { return mLineNumber; }
+ uint32_t GetColumnNumber() const { return mColumnNumber; }
+
+ // Whether this a rule in a read only style sheet.
+ bool IsReadOnly() const;
+
+ // Whether this rule is an @import rule that hasn't loaded yet (and thus
+ // doesn't affect the style of the page).
+ bool IsIncompleteImportRule() const;
+
+ // This is pure virtual because all of Rule's data members are non-owning and
+ // thus measured elsewhere.
+ virtual size_t SizeOfIncludingThis(MallocSizeOf) const MOZ_MUST_OVERRIDE = 0;
+
+ virtual StyleCssRuleType Type() const = 0;
+
+ // WebIDL interface
+ uint16_t TypeForBindings() const {
+ auto type = uint16_t(Type());
+ // Per https://drafts.csswg.org/cssom/#dom-cssrule-type for constants > 15
+ // we return 0.
+ return type > 15 ? 0 : type;
+ }
+ virtual void GetCssText(nsACString& aCssText) const = 0;
+ void SetCssText(const nsACString& aCssText);
+ Rule* GetParentRule() const;
+ StyleSheet* GetParentStyleSheet() const { return GetStyleSheet(); }
+ nsINode* GetAssociatedDocumentOrShadowRoot() const {
+ if (!mSheet) {
+ return nullptr;
+ }
+ auto* associated = mSheet->GetAssociatedDocumentOrShadowRoot();
+ return associated ? &associated->AsNode() : nullptr;
+ }
+ nsISupports* GetParentObject() const {
+ return mSheet ? mSheet->GetRelevantGlobal() : nullptr;
+ }
+
+ protected:
+ // True if we're known-live for cycle collection purposes.
+ bool IsKnownLive() const;
+
+ // Hook subclasses can use to properly unlink the nsWrapperCache of
+ // their declarations.
+ void UnlinkDeclarationWrapper(nsWrapperCache& aDecl);
+
+ // mSheet should only ever be null when we create a synthetic CSSFontFaceRule
+ // for an InspectorFontFace.
+ //
+ // mSheet and mParentRule will be cleared when they are detached from the
+ // parent object, either because the rule is removed or the parent is
+ // destroyed.
+ StyleSheet* MOZ_NON_OWNING_REF mSheet;
+ Rule* MOZ_NON_OWNING_REF mParentRule;
+
+ // Keep the same type so that MSVC packs them.
+ uint32_t mLineNumber;
+ uint32_t mColumnNumber;
+};
+
+} // namespace css
+} // namespace mozilla
+
+#endif /* mozilla_css_Rule_h___ */