diff -r 000000000000 -r 6474c204b198 layout/style/nsCSSPseudoClasses.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/nsCSSPseudoClasses.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,101 @@
+/* -*- 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-classes */
+
+#include "mozilla/ArrayUtils.h"
+
+#include "nsCSSPseudoClasses.h"
+#include "nsStaticAtom.h"
+#include "mozilla/Preferences.h"
+#include "nsString.h"
+
+using namespace mozilla;
+
+// define storage for all atoms
+#define CSS_PSEUDO_CLASS(_name, _value, _pref) \
+  static nsIAtom* sPseudoClass_##_name;
+#include "nsCSSPseudoClassList.h"
+#undef CSS_PSEUDO_CLASS
+
+#define CSS_PSEUDO_CLASS(name_, value_, pref_)  \
+  NS_STATIC_ATOM_BUFFER(name_##_pseudo_class_buffer, value_)
+#include "nsCSSPseudoClassList.h"
+#undef CSS_PSEUDO_CLASS
+
+static const nsStaticAtom CSSPseudoClasses_info[] = {
+#define CSS_PSEUDO_CLASS(name_, value_, pref_)            \
+  NS_STATIC_ATOM(name_##_pseudo_class_buffer, &sPseudoClass_##name_),
+#include "nsCSSPseudoClassList.h"
+#undef CSS_PSEUDO_CLASS
+};
+
+static bool sPseudoClassEnabled[] = {
+#define CSS_PSEUDO_CLASS(name_, value_, pref_)            \
+  true,
+#include "nsCSSPseudoClassList.h"
+#undef CSS_PSEUDO_CLASS
+};  
+
+void nsCSSPseudoClasses::AddRefAtoms()
+{
+  NS_RegisterStaticAtoms(CSSPseudoClasses_info);
+  
+#define CSS_PSEUDO_CLASS(name_, value_, pref_)                               \
+  if (pref_[0]) {                                                            \
+    Preferences::AddBoolVarCache(&sPseudoClassEnabled[ePseudoClass_##name_], \
+                                 pref_);                                     \
+  }
+#include "nsCSSPseudoClassList.h"
+#undef CSS_PSEUDO_CLASS
+}
+
+bool
+nsCSSPseudoClasses::HasStringArg(Type aType)
+{
+  return aType == ePseudoClass_lang ||
+         aType == ePseudoClass_mozEmptyExceptChildrenWithLocalname ||
+         aType == ePseudoClass_mozSystemMetric ||
+         aType == ePseudoClass_mozLocaleDir ||
+         aType == ePseudoClass_dir;
+}
+
+bool
+nsCSSPseudoClasses::HasNthPairArg(Type aType)
+{
+  return aType == ePseudoClass_nthChild ||
+         aType == ePseudoClass_nthLastChild ||
+         aType == ePseudoClass_nthOfType ||
+         aType == ePseudoClass_nthLastOfType;
+}
+
+void
+nsCSSPseudoClasses::PseudoTypeToString(Type aType, nsAString& aString)
+{
+  NS_ABORT_IF_FALSE(aType < ePseudoClass_Count, "Unexpected type");
+  NS_ABORT_IF_FALSE(aType >= 0, "Very unexpected type");
+  (*CSSPseudoClasses_info[aType].mAtom)->ToString(aString);
+}
+
+nsCSSPseudoClasses::Type
+nsCSSPseudoClasses::GetPseudoType(nsIAtom* aAtom)
+{
+  for (uint32_t i = 0; i < ArrayLength(CSSPseudoClasses_info); ++i) {
+    if (*CSSPseudoClasses_info[i].mAtom == aAtom) {
+      return sPseudoClassEnabled[i] ? Type(i) : ePseudoClass_NotPseudoClass;
+    }
+  }
+
+  return nsCSSPseudoClasses::ePseudoClass_NotPseudoClass;
+}
+
+/* static */ bool
+nsCSSPseudoClasses::IsUserActionPseudoClass(Type aType)
+{
+  // See http://dev.w3.org/csswg/selectors4/#useraction-pseudos
+  return aType == ePseudoClass_hover ||
+         aType == ePseudoClass_active ||
+         aType == ePseudoClass_focus;
+}