1 files changed, 49 insertions, 0 deletions
diff --git a/layout/style/nsHTMLCSSStyleSheet.h b/layout/style/nsHTMLCSSStyleSheet.h
new file mode 100644
index 0000000000..7c087cef5d
--- /dev/null
+++ b/layout/style/nsHTMLCSSStyleSheet.h
@@ -0,0 +1,49 @@
+/* -*- 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/. */
+
+/*
+ * style sheet and style rule processor representing style attributes
+ */
+
+#ifndef nsHTMLCSSStyleSheet_h_
+#define nsHTMLCSSStyleSheet_h_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+
+#include "nsTHashMap.h"
+
+class nsRuleWalker;
+struct MiscContainer;
+
+namespace mozilla {
+enum class PseudoStyleType : uint8_t;
+namespace dom {
+class Element;
+}  // namespace dom
+}  // namespace mozilla
+
+class nsHTMLCSSStyleSheet final {
+ public:
+  nsHTMLCSSStyleSheet();
+
+  NS_INLINE_DECL_REFCOUNTING(nsHTMLCSSStyleSheet)
+
+  void CacheStyleAttr(const nsAString& aSerialized, MiscContainer* aValue);
+  void EvictStyleAttr(const nsAString& aSerialized, MiscContainer* aValue);
+  MiscContainer* LookupStyleAttr(const nsAString& aSerialized);
+
+ private:
+  ~nsHTMLCSSStyleSheet();
+
+  nsHTMLCSSStyleSheet(const nsHTMLCSSStyleSheet& aCopy) = delete;
+  nsHTMLCSSStyleSheet& operator=(const nsHTMLCSSStyleSheet& aCopy) = delete;
+
+ protected:
+  nsTHashMap<nsStringHashKey, MiscContainer*> mCachedStyleAttrs;
+};
+
+#endif /* !defined(nsHTMLCSSStyleSheet_h_) */