1 files changed, 103 insertions, 0 deletions
diff --git a/layout/style/GroupRule.h b/layout/style/GroupRule.h
new file mode 100644
index 0000000000..5994436a7b
--- /dev/null
+++ b/layout/style/GroupRule.h
@@ -0,0 +1,103 @@
+/* -*- 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/. */
+
+/*
+ * internal interface representing CSS style rules that contain other
+ * rules, such as @media rules
+ */
+
+#ifndef mozilla_css_GroupRule_h__
+#define mozilla_css_GroupRule_h__
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/ServoCSSRuleList.h"
+#include "mozilla/css/Rule.h"
+#include "nsCycleCollectionParticipant.h"
+
+namespace mozilla {
+
+class ErrorResult;
+class StyleSheet;
+
+namespace dom {
+class CSSRuleList;
+}  // namespace dom
+
+namespace css {
+
+// inherits from Rule so it can be shared between
+// MediaRule and DocumentRule
+class GroupRule : public Rule {
+ protected:
+  GroupRule(already_AddRefed<StyleLockedCssRules> aRules, StyleSheet* aSheet,
+            Rule* aParentRule, uint32_t aLineNumber, uint32_t aColumnNumber);
+  GroupRule(const GroupRule& aCopy) = delete;
+  virtual ~GroupRule();
+
+ public:
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(GroupRule, Rule)
+  NS_DECL_ISUPPORTS_INHERITED
+  virtual bool IsCCLeaf() const override;
+
+#ifdef DEBUG
+  void List(FILE* out = stdout, int32_t aIndent = 0) const override;
+#endif
+  void DropSheetReference() override;
+
+ public:
+  int32_t StyleRuleCount() const { return mRuleList ? mRuleList->Length() : 0; }
+
+  Rule* GetStyleRuleAt(int32_t aIndex) const {
+    return mRuleList ? mRuleList->GetRule(aIndex) : nullptr;
+  }
+
+  void SetRawAfterClone(RefPtr<StyleLockedCssRules> aRules) {
+    if (mRuleList) {
+      mRuleList->SetRawAfterClone(std::move(aRules));
+    } else {
+      MOZ_ASSERT(!aRules, "Can't move from having no rules to having rules");
+    }
+  }
+
+  /*
+   * The next method should never be called unless you have first called
+   * WillDirty() on the parent stylesheet.
+   */
+  nsresult DeleteStyleRuleAt(uint32_t aIndex) {
+    if (!mRuleList) {
+      return NS_OK;
+    }
+    return mRuleList->DeleteRule(aIndex);
+  }
+
+  // non-virtual -- it is only called by subclasses
+  size_t SizeOfExcludingThis(MallocSizeOf) const;
+  size_t SizeOfIncludingThis(MallocSizeOf) const override = 0;
+
+  // WebIDL API
+  ServoCSSRuleList* GetCssRules() { return mRuleList; }
+  uint32_t InsertRule(const nsACString& aRule, uint32_t aIndex,
+                      ErrorResult& aRv);
+  void DeleteRule(uint32_t aIndex, ErrorResult& aRv);
+
+ private:
+  RefPtr<ServoCSSRuleList> mRuleList;
+};
+
+// Implementation of WebIDL CSSConditionRule.
+class ConditionRule : public GroupRule {
+ protected:
+  using GroupRule::GroupRule;
+
+ public:
+  virtual void GetConditionText(nsACString& aConditionText) = 0;
+};
+
+}  // namespace css
+}  // namespace mozilla
+
+#endif /* mozilla_css_GroupRule_h__ */