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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/. */
+
+/* atom list for CSS pseudo-elements */
+
+#ifndef nsCSSPseudoElements_h___
+#define nsCSSPseudoElements_h___
+
+#include "nsGkAtoms.h"
+#include "mozilla/CSSEnabledState.h"
+#include "mozilla/Compiler.h"
+#include "mozilla/PseudoStyleType.h"
+#include "mozilla/StaticPrefs_dom.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)?
+//
+// Note: We also rely on this for IsEagerlyCascadedInServo.
+#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)
+// Should this pseudo-element be enabled only for UA sheets?
+#define CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS (1 << 4)
+// Should this pseudo-element be enabled only for UA sheets and chrome
+// stylesheets?
+#define CSS_PSEUDO_ELEMENT_ENABLED_IN_CHROME (1 << 5)
+
+#define CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS_AND_CHROME \
+ (CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS | \
+ CSS_PSEUDO_ELEMENT_ENABLED_IN_CHROME)
+
+// Can we use the ChromeOnly document.createElement(..., { pseudo: "::foo" })
+// API for creating pseudo-implementing native anonymous content in JS with this
+// pseudo-element?
+#define CSS_PSEUDO_ELEMENT_IS_JS_CREATED_NAC (1 << 6)
+// Does this pseudo-element act like an item for containers (such as flex and
+// grid containers) and thus needs parent display-based style fixup?
+#define CSS_PSEUDO_ELEMENT_IS_FLEX_OR_GRID_ITEM (1 << 7)
+
+class nsCSSPseudoElements {
+ typedef mozilla::PseudoStyleType Type;
+ typedef mozilla::CSSEnabledState EnabledState;
+
+ public:
+ static bool IsEagerlyCascadedInServo(const Type aType) {
+ return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_IS_CSS2);
+ }
+
+ public:
+#ifdef DEBUG
+ static void AssertAtoms();
+#endif
+
+// Alias nsCSSPseudoElements::foo() to nsGkAtoms::foo.
+#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
+ static nsCSSPseudoElementStaticAtom* name_() { \
+ return const_cast<nsCSSPseudoElementStaticAtom*>( \
+ static_cast<const nsCSSPseudoElementStaticAtom*>( \
+ nsGkAtoms::PseudoElement_##name_)); \
+ }
+#include "nsCSSPseudoElementList.h"
+#undef CSS_PSEUDO_ELEMENT
+
+ // Returns Nothing() for a syntactically invalid pseudo-element, and NotPseudo
+ // for the empty / null string.
+ static mozilla::Maybe<Type> GetPseudoType(
+ const nsAString& aPseudoElement,
+ EnabledState = EnabledState::ForAllContent);
+
+ // Get the atom for a given Type. aType must be <
+ // PseudoType::CSSPseudoElementsEnd.
+ // This only ever returns static atoms, so it's fine to return a raw pointer.
+ static nsAtom* GetPseudoAtom(Type aType);
+
+ // Get the atom for a given pseudo-element string (e.g. "::before"). This can
+ // return dynamic atoms, for unrecognized pseudo-elements.
+ static already_AddRefed<nsAtom> GetPseudoAtom(
+ const nsAString& aPseudoElement);
+
+ static bool PseudoElementContainsElements(const Type aType) {
+ return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_CONTAINS_ELEMENTS);
+ }
+
+ static bool PseudoElementSupportsStyleAttribute(const Type aType) {
+ MOZ_ASSERT(aType < Type::CSSPseudoElementsEnd);
+ return PseudoElementHasFlags(aType,
+ CSS_PSEUDO_ELEMENT_SUPPORTS_STYLE_ATTRIBUTE);
+ }
+
+ static bool PseudoElementSupportsUserActionState(const Type aType);
+
+ static bool PseudoElementIsJSCreatedNAC(Type aType) {
+ return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_IS_JS_CREATED_NAC);
+ }
+
+ static bool PseudoElementIsFlexOrGridItem(const Type aType) {
+ return PseudoElementHasFlags(aType,
+ CSS_PSEUDO_ELEMENT_IS_FLEX_OR_GRID_ITEM);
+ }
+
+ static bool EnabledInContent(Type aType) {
+ if (aType == Type::highlight &&
+ !mozilla::StaticPrefs::dom_customHighlightAPI_enabled()) {
+ return false;
+ }
+ return !PseudoElementHasAnyFlag(
+ aType, CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS_AND_CHROME);
+ }
+
+ static bool IsEnabled(Type aType, EnabledState aEnabledState) {
+ if (EnabledInContent(aType)) {
+ return true;
+ }
+
+ if ((aEnabledState & EnabledState::InUASheets) &&
+ PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_ENABLED_IN_UA_SHEETS)) {
+ return true;
+ }
+
+ if ((aEnabledState & EnabledState::InChrome) &&
+ PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_ENABLED_IN_CHROME)) {
+ return true;
+ }
+
+ return false;
+ }
+
+ static nsString PseudoTypeAsString(Type aPseudoType);
+
+ private:
+ // Does the given pseudo-element have all of the flags given?
+ static bool PseudoElementHasFlags(const Type aType, uint32_t aFlags) {
+ MOZ_ASSERT(aType < Type::CSSPseudoElementsEnd);
+ return (kPseudoElementFlags[size_t(aType)] & aFlags) == aFlags;
+ }
+
+ static bool PseudoElementHasAnyFlag(const Type aType, uint32_t aFlags) {
+ MOZ_ASSERT(aType < Type::CSSPseudoElementsEnd);
+ return (kPseudoElementFlags[size_t(aType)] & aFlags) != 0;
+ }
+
+ static nsStaticAtom* GetAtomBase();
+
+ static const uint32_t kPseudoElementFlags[size_t(Type::CSSPseudoElementsEnd)];
+};
+
+#endif /* nsCSSPseudoElements_h___ */