diff -r 000000000000 -r 6474c204b198 layout/style/nsCSSPseudoElements.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/nsCSSPseudoElements.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/* atom list for CSS pseudo-elements */
+
+#ifndef nsCSSPseudoElements_h___
+#define nsCSSPseudoElements_h___
+
+#include "nsIAtom.h"
+
+// Is this pseudo-element a CSS2 pseudo-element that can be specified
+// with the single colon syntax (in addition to the double-colon syntax,
+// which can be used for all pseudo-elements)?
+#define CSS_PSEUDO_ELEMENT_IS_CSS2                     (1<<0)
+// Is this pseudo-element a pseudo-element that can contain other
+// elements?
+// (Currently pseudo-elements are either leaves of the tree (relative to
+// real elements) or they contain other elements in a non-tree-like
+// manner (i.e., like incorrectly-nested start and end tags).  It's
+// possible that in the future there might be container pseudo-elements
+// that form a properly nested tree structure.  If that happens, we
+// should probably split this flag into two.)
+#define CSS_PSEUDO_ELEMENT_CONTAINS_ELEMENTS           (1<<1)
+// Flag to add the ability to take into account style attribute set for the
+// pseudo element (by default it's ignored).
+#define CSS_PSEUDO_ELEMENT_SUPPORTS_STYLE_ATTRIBUTE    (1<<2)
+// Flag that indicate the pseudo-element supports a user action pseudo-class
+// following it, such as :active or :hover.  This would normally correspond
+// to whether the pseudo-element is tree-like, but we don't support these
+// pseudo-classes on ::before and ::after generated content yet.  See
+// http://dev.w3.org/csswg/selectors4/#pseudo-elements.
+#define CSS_PSEUDO_ELEMENT_SUPPORTS_USER_ACTION_STATE  (1<<3)
+// Is content prevented from parsing selectors containing this pseudo-element?
+#define CSS_PSEUDO_ELEMENT_IS_CHROME_ONLY              (1<<4)
+
+// Empty class derived from nsIAtom so that function signatures can
+// require an atom from this atom list.
+class nsICSSPseudoElement : public nsIAtom {};
+
+class nsCSSPseudoElements {
+public:
+
+  static void AddRefAtoms();
+
+  static bool IsPseudoElement(nsIAtom *aAtom);
+
+  static bool IsCSS2PseudoElement(nsIAtom *aAtom);
+
+#define CSS_PSEUDO_ELEMENT(_name, _value, _flags) \
+  static nsICSSPseudoElement* _name;
+#include "nsCSSPseudoElementList.h"
+#undef CSS_PSEUDO_ELEMENT
+
+  enum Type {
+    // If the actual pseudo-elements stop being first here, change
+    // GetPseudoType.
+#define CSS_PSEUDO_ELEMENT(_name, _value_, _flags) \
+    ePseudo_##_name,
+#include "nsCSSPseudoElementList.h"
+#undef CSS_PSEUDO_ELEMENT
+    ePseudo_PseudoElementCount,
+    ePseudo_AnonBox = ePseudo_PseudoElementCount,
+#ifdef MOZ_XUL
+    ePseudo_XULTree,
+#endif
+    ePseudo_NotPseudoElement,
+    ePseudo_MAX
+  };
+
+  static Type GetPseudoType(nsIAtom* aAtom);
+
+  // Get the atom for a given Type.  aType must be < ePseudo_PseudoElementCount
+  static nsIAtom* GetPseudoAtom(Type aType);
+
+  static bool PseudoElementContainsElements(const Type aType) {
+    return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_CONTAINS_ELEMENTS);
+  }
+
+  static bool PseudoElementSupportsStyleAttribute(const Type aType) {
+    MOZ_ASSERT(aType < ePseudo_PseudoElementCount);
+    return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_SUPPORTS_STYLE_ATTRIBUTE);
+  }
+
+  static bool PseudoElementSupportsUserActionState(const Type aType);
+
+  static bool PseudoElementIsChromeOnly(const Type aType) {
+    MOZ_ASSERT(aType < ePseudo_PseudoElementCount);
+    return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_IS_CHROME_ONLY);
+  }
+
+private:
+  static uint32_t FlagsForPseudoElement(const Type aType);
+
+  // Does the given pseudo-element have all of the flags given?
+  static bool PseudoElementHasFlags(const Type aType, uint32_t aFlags)
+  {
+    return (FlagsForPseudoElement(aType) & aFlags) == aFlags;
+  }
+};
+
+#endif /* nsCSSPseudoElements_h___ */