1 files changed, 101 insertions, 0 deletions
diff --git a/layout/style/CSSPageRule.h b/layout/style/CSSPageRule.h
new file mode 100644
index 0000000000..95ab9fc735
--- /dev/null
+++ b/layout/style/CSSPageRule.h
@@ -0,0 +1,101 @@
+/* -*- 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_CSSPageRule_h
+#define mozilla_dom_CSSPageRule_h
+
+#include "mozilla/css/Rule.h"
+#include "mozilla/ServoBindingTypes.h"
+
+#include "nsDOMCSSDeclaration.h"
+#include "nsICSSDeclaration.h"
+
+namespace mozilla {
+class DeclarationBlock;
+
+namespace dom {
+class DocGroup;
+class CSSPageRule;
+
+class CSSPageRuleDeclaration final : public nsDOMCSSDeclaration {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  css::Rule* GetParentRule() final;
+  nsINode* GetParentObject() final;
+
+ protected:
+  DeclarationBlock* GetOrCreateCSSDeclaration(
+      Operation aOperation, DeclarationBlock** aCreated) final;
+  nsresult SetCSSDeclaration(DeclarationBlock* aDecl,
+                             MutationClosureData* aClosureData) final;
+  Document* DocToUpdate() final { return nullptr; }
+  nsDOMCSSDeclaration::ParsingEnvironment GetParsingEnvironment(
+      nsIPrincipal* aSubjectPrincipal) const final;
+
+ private:
+  // For accessing the constructor.
+  friend class CSSPageRule;
+
+  explicit CSSPageRuleDeclaration(
+      already_AddRefed<RawServoDeclarationBlock> aDecls);
+  ~CSSPageRuleDeclaration();
+
+  inline CSSPageRule* Rule();
+  inline const CSSPageRule* Rule() const;
+
+  RefPtr<DeclarationBlock> mDecls;
+};
+
+class CSSPageRule final : public css::Rule {
+ public:
+  CSSPageRule(RefPtr<RawServoPageRule> aRawRule, StyleSheet* aSheet,
+              css::Rule* aParentRule, uint32_t aLine, uint32_t aColumn);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(CSSPageRule, css::Rule)
+
+  bool IsCCLeaf() const final;
+
+  RawServoPageRule* Raw() const { return mRawRule; }
+
+  // WebIDL interfaces
+  uint16_t Type() const final { return CSSRule_Binding::PAGE_RULE; }
+  void GetCssText(nsACString& aCssText) const final;
+  nsICSSDeclaration* Style();
+
+  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const final;
+
+#ifdef DEBUG
+  void List(FILE* out = stdout, int32_t aIndent = 0) const final;
+#endif
+
+  JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
+
+ private:
+  ~CSSPageRule() = default;
+
+  // For computing the offset of mDecls.
+  friend class CSSPageRuleDeclaration;
+
+  RefPtr<RawServoPageRule> mRawRule;
+  CSSPageRuleDeclaration mDecls;
+};
+
+CSSPageRule* CSSPageRuleDeclaration::Rule() {
+  return reinterpret_cast<CSSPageRule*>(reinterpret_cast<uint8_t*>(this) -
+                                        offsetof(CSSPageRule, mDecls));
+}
+
+const CSSPageRule* CSSPageRuleDeclaration::Rule() const {
+  return reinterpret_cast<const CSSPageRule*>(
+      reinterpret_cast<const uint8_t*>(this) - offsetof(CSSPageRule, mDecls));
+}
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_CSSPageRule_h