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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : /* atom list for CSS pseudo-elements */
       7             : 
       8             : #ifndef nsCSSPseudoElements_h___
       9             : #define nsCSSPseudoElements_h___
      10             : 
      11             : #include "nsIAtom.h"
      12             : #include "mozilla/CSSEnabledState.h"
      13             : #include "mozilla/Compiler.h"
      14             : 
      15             : // Is this pseudo-element a CSS2 pseudo-element that can be specified
      16             : // with the single colon syntax (in addition to the double-colon syntax,
      17             : // which can be used for all pseudo-elements)?
      18             : #define CSS_PSEUDO_ELEMENT_IS_CSS2                     (1<<0)
      19             : // Is this pseudo-element a pseudo-element that can contain other
      20             : // elements?
      21             : // (Currently pseudo-elements are either leaves of the tree (relative to
      22             : // real elements) or they contain other elements in a non-tree-like
      23             : // manner (i.e., like incorrectly-nested start and end tags).  It's
      24             : // possible that in the future there might be container pseudo-elements
      25             : // that form a properly nested tree structure.  If that happens, we
      26             : // should probably split this flag into two.)
      27             : #define CSS_PSEUDO_ELEMENT_CONTAINS_ELEMENTS           (1<<1)
      28             : // Flag to add the ability to take into account style attribute set for the
      29             : // pseudo element (by default it's ignored).
      30             : #define CSS_PSEUDO_ELEMENT_SUPPORTS_STYLE_ATTRIBUTE    (1<<2)
      31             : // Flag that indicate the pseudo-element supports a user action pseudo-class
      32             : // following it, such as :active or :hover.  This would normally correspond
      33             : // to whether the pseudo-element is tree-like, but we don't support these
      34             : // pseudo-classes on ::before and ::after generated content yet.  See
      35             : // http://dev.w3.org/csswg/selectors4/#pseudo-elements.
      36             : #define CSS_PSEUDO_ELEMENT_SUPPORTS_USER_ACTION_STATE  (1<<3)
      37             : // Is content prevented from parsing selectors containing this pseudo-element?
      38             : #define CSS_PSEUDO_ELEMENT_UA_SHEET_ONLY               (1<<4)
      39             : // Can we use the ChromeOnly document.createElement(..., { pseudo: "::foo" })
      40             : // API for creating pseudo-implementing native anonymous content in JS with this
      41             : // pseudo-element?
      42             : #define CSS_PSEUDO_ELEMENT_IS_JS_CREATED_NAC           (1<<5)
      43             : // Does this pseudo-element act like an item for containers (such as flex and
      44             : // grid containers) and thus needs parent display-based style fixup?
      45             : #define CSS_PSEUDO_ELEMENT_IS_FLEX_OR_GRID_ITEM        (1<<6)
      46             : 
      47             : namespace mozilla {
      48             : 
      49             : // The total count of CSSPseudoElement is less than 256,
      50             : // so use uint8_t as its underlying type.
      51             : typedef uint8_t CSSPseudoElementTypeBase;
      52             : enum class CSSPseudoElementType : CSSPseudoElementTypeBase {
      53             :   // If the actual pseudo-elements stop being first here, change
      54             :   // GetPseudoType.
      55             : #define CSS_PSEUDO_ELEMENT(_name, _value_, _flags) \
      56             :   _name,
      57             : #include "nsCSSPseudoElementList.h"
      58             : #undef CSS_PSEUDO_ELEMENT
      59             :   Count,
      60             :   InheritingAnonBox = Count, // pseudo from nsCSSAnonBoxes,
      61             :                              // IsNonInheritingAnonBox false.
      62             :   NonInheritingAnonBox, // from nsCSSAnonBoxes, IsNonInheritingAnonBox true.
      63             : #ifdef MOZ_XUL
      64             :   XULTree,
      65             : #endif
      66             :   NotPseudo,
      67             :   MAX
      68             : };
      69             : 
      70             : } // namespace mozilla
      71             : 
      72             : // Empty class derived from nsIAtom so that function signatures can
      73             : // require an atom from this atom list.
      74             : class nsICSSPseudoElement : public nsIAtom {};
      75             : 
      76             : class nsCSSPseudoElements
      77             : {
      78             :   typedef mozilla::CSSPseudoElementType Type;
      79             :   typedef mozilla::CSSEnabledState EnabledState;
      80             : 
      81             : public:
      82             :   static void AddRefAtoms();
      83             : 
      84             :   static bool IsPseudoElement(nsIAtom *aAtom);
      85             : 
      86             :   static bool IsCSS2PseudoElement(nsIAtom *aAtom);
      87             : 
      88             : #define CSS_PSEUDO_ELEMENT(_name, _value, _flags) \
      89             :   static nsICSSPseudoElement* _name;
      90             : #include "nsCSSPseudoElementList.h"
      91             : #undef CSS_PSEUDO_ELEMENT
      92             : 
      93             :   static Type GetPseudoType(nsIAtom* aAtom, EnabledState aEnabledState);
      94             : 
      95             :   // Get the atom for a given Type.  aType must be < CSSPseudoElementType::Count
      96             :   static nsIAtom* GetPseudoAtom(Type aType);
      97             : 
      98             :   // Get the atom for a given nsAString. (e.g. "::before")
      99             :   static nsIAtom* GetPseudoAtom(const nsAString& aPseudoElement);
     100             : 
     101           0 :   static bool PseudoElementContainsElements(const Type aType) {
     102           0 :     return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_CONTAINS_ELEMENTS);
     103             :   }
     104             : 
     105        1292 :   static bool PseudoElementSupportsStyleAttribute(const Type aType) {
     106        1292 :     MOZ_ASSERT(aType < Type::Count);
     107             :     return PseudoElementHasFlags(aType,
     108        1292 :                                  CSS_PSEUDO_ELEMENT_SUPPORTS_STYLE_ATTRIBUTE);
     109             :   }
     110             : 
     111             :   static bool PseudoElementSupportsUserActionState(const Type aType);
     112             : 
     113          10 :   static bool PseudoElementIsJSCreatedNAC(Type aType)
     114             :   {
     115          10 :     return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_IS_JS_CREATED_NAC);
     116             :   }
     117             : 
     118          53 :   static bool PseudoElementIsFlexOrGridItem(const Type aType)
     119             :   {
     120             :     return PseudoElementHasFlags(aType,
     121          53 :                                  CSS_PSEUDO_ELEMENT_IS_FLEX_OR_GRID_ITEM);
     122             :   }
     123             : 
     124         259 :   static bool IsEnabled(Type aType, EnabledState aEnabledState)
     125             :   {
     126         279 :     return !PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_UA_SHEET_ONLY) ||
     127         279 :            (aEnabledState & EnabledState::eInUASheets);
     128             :   }
     129             : 
     130             : private:
     131             :   // Does the given pseudo-element have all of the flags given?
     132             : 
     133             :   // Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64037 ,
     134             :   // which is a general gcc bug that we seem to have hit only on Android/x86.
     135             : #if defined(ANDROID) && defined(__i386__) && defined(__GNUC__) && \
     136             :     !defined(__clang__)
     137             : #if (MOZ_GCC_VERSION_AT_LEAST(4,8,0) && MOZ_GCC_VERSION_AT_MOST(4,8,4)) || \
     138             :     (MOZ_GCC_VERSION_AT_LEAST(4,9,0) && MOZ_GCC_VERSION_AT_MOST(4,9,2))
     139             :    __attribute__((noinline))
     140             : #endif
     141             : #endif
     142        2326 :   static bool PseudoElementHasFlags(const Type aType, uint32_t aFlags)
     143             :   {
     144        2326 :     MOZ_ASSERT(aType < Type::Count);
     145        2326 :     return (kPseudoElementFlags[size_t(aType)] & aFlags) == aFlags;
     146             :   }
     147             : 
     148             :   static const uint32_t kPseudoElementFlags[size_t(Type::Count)];
     149             : };
     150             : 
     151             : #endif /* nsCSSPseudoElements_h___ */