1 files changed, 90 insertions, 0 deletions
diff --git a/layout/style/nsCSSPseudoClasses.h b/layout/style/nsCSSPseudoClasses.h
new file mode 100644
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+++ b/layout/style/nsCSSPseudoClasses.h
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+/* -*- 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 */
+
+#ifndef nsCSSPseudoClasses_h___
+#define nsCSSPseudoClasses_h___
+
+#include "nsStringFwd.h"
+
+// The following two flags along with the pref defines where this pseudo
+// class can be used:
+// * If none of the two flags is presented, the pref completely controls
+//   the availability of this pseudo class. And in that case, if it has
+//   no pref, this property is usable everywhere.
+// * If any of the flags is set, this pseudo class is always enabled in
+//   the specific contexts regardless of the value of the pref. If there
+//   is no pref for this pseudo class at all in this case, it is an
+//   internal-only pseudo class, which cannot be used anywhere else.
+#define CSS_PSEUDO_CLASS_ENABLED_MASK                  (3<<0)
+#define CSS_PSEUDO_CLASS_ENABLED_IN_UA_SHEETS          (1<<0)
+#define CSS_PSEUDO_CLASS_ENABLED_IN_CHROME             (1<<1)
+#define CSS_PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME \
+  (CSS_PSEUDO_CLASS_ENABLED_IN_UA_SHEETS | CSS_PSEUDO_CLASS_ENABLED_IN_CHROME)
+
+class nsIAtom;
+
+namespace mozilla {
+
+// The total count of CSSPseudoClassType is less than 256,
+// so use uint8_t as its underlying type.
+typedef uint8_t CSSPseudoClassTypeBase;
+enum class CSSPseudoClassType : CSSPseudoClassTypeBase
+{
+#define CSS_PSEUDO_CLASS(_name, _value, _flags, _pref) \
+  _name,
+#include "nsCSSPseudoClassList.h"
+#undef CSS_PSEUDO_CLASS
+  Count,
+  NotPseudo,  // This value MUST be second last! SelectorMatches depends on it.
+  MAX
+};
+
+} // namespace mozilla
+
+class nsCSSPseudoClasses
+{
+  typedef mozilla::CSSPseudoClassType Type;
+  typedef mozilla::CSSEnabledState EnabledState;
+
+public:
+  static void AddRefAtoms();
+
+  static Type GetPseudoType(nsIAtom* aAtom, EnabledState aEnabledState);
+  static bool HasStringArg(Type aType);
+  static bool HasNthPairArg(Type aType);
+  static bool HasSelectorListArg(Type aType) {
+    return aType == Type::any;
+  }
+  static bool IsUserActionPseudoClass(Type aType);
+
+  // Should only be used on types other than Count and NotPseudoClass
+  static void PseudoTypeToString(Type aType, nsAString& aString);
+
+  static bool IsEnabled(Type aType, EnabledState aEnabledState)
+  {
+    auto index = static_cast<size_t>(aType);
+    MOZ_ASSERT(index < static_cast<size_t>(Type::Count));
+    if (sPseudoClassEnabled[index] ||
+        aEnabledState == EnabledState::eIgnoreEnabledState) {
+      return true;
+    }
+    auto flags = kPseudoClassFlags[index];
+    if (((aEnabledState & EnabledState::eInChrome) &&
+         (flags & CSS_PSEUDO_CLASS_ENABLED_IN_CHROME)) ||
+        ((aEnabledState & EnabledState::eInUASheets) &&
+         (flags & CSS_PSEUDO_CLASS_ENABLED_IN_UA_SHEETS))) {
+      return true;
+    }
+    return false;
+  }
+
+private:
+  static const uint32_t kPseudoClassFlags[size_t(Type::Count)];
+  static bool sPseudoClassEnabled[size_t(Type::Count)];
+};
+
+#endif /* nsCSSPseudoClasses_h___ */