1 files changed, 65 insertions, 0 deletions
diff --git a/layout/inspector/ServoStyleRuleMap.h b/layout/inspector/ServoStyleRuleMap.h
new file mode 100644
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+++ b/layout/inspector/ServoStyleRuleMap.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/. */
+
+#ifndef mozilla_ServoStyleRuleMap_h
+#define mozilla_ServoStyleRuleMap_h
+
+#include "mozilla/dom/CSSStyleRule.h"
+#include "mozilla/StyleSheet.h"
+
+#include "nsDataHashtable.h"
+
+struct RawServoStyleRule;
+
+namespace mozilla {
+class ServoCSSRuleList;
+class ServoStyleSet;
+namespace css {
+class Rule;
+}  // namespace css
+namespace dom {
+class ShadowRoot;
+}
+class ServoStyleRuleMap {
+ public:
+  ServoStyleRuleMap() = default;
+
+  void EnsureTable(ServoStyleSet&);
+  void EnsureTable(dom::ShadowRoot&);
+
+  dom::CSSStyleRule* Lookup(const RawServoStyleRule* aRawRule) const {
+    return mTable.Get(aRawRule);
+  }
+
+  void SheetAdded(StyleSheet&);
+  void SheetRemoved(StyleSheet&);
+
+  void RuleAdded(StyleSheet& aStyleSheet, css::Rule&);
+  void RuleRemoved(StyleSheet& aStyleSheet, css::Rule&);
+
+  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
+
+  ~ServoStyleRuleMap() = default;
+
+ private:
+  // Since we would never have a document which contains no style rule,
+  // we use IsEmpty as an indication whether we need to walk through
+  // all stylesheets to fill the table.
+  bool IsEmpty() const { return mTable.Count() == 0; }
+
+  void FillTableFromRule(css::Rule&);
+  void FillTableFromRuleList(ServoCSSRuleList&);
+  void FillTableFromStyleSheet(StyleSheet&);
+
+  typedef nsDataHashtable<nsPtrHashKey<const RawServoStyleRule>,
+                          WeakPtr<dom::CSSStyleRule>>
+      Hashtable;
+  Hashtable mTable;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_ServoStyleRuleMap_h