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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-elements */
#ifndef nsCSSPseudoElements_h___
#define nsCSSPseudoElements_h___
#include "nsIAtom.h"
#include "mozilla/CSSEnabledState.h"
#include "mozilla/Compiler.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_UA_SHEET_ONLY (1<<4)
// 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<<5)
namespace mozilla {
// The total count of CSSPseudoElement is less than 256,
// so use uint8_t as its underlying type.
typedef uint8_t CSSPseudoElementTypeBase;
enum class CSSPseudoElementType : CSSPseudoElementTypeBase {
// If the actual pseudo-elements stop being first here, change
// GetPseudoType.
#define CSS_PSEUDO_ELEMENT(_name, _value_, _flags) \
_name,
#include "nsCSSPseudoElementList.h"
#undef CSS_PSEUDO_ELEMENT
Count,
AnonBox = Count,
#ifdef MOZ_XUL
XULTree,
#endif
NotPseudo,
MAX
};
} // namespace mozilla
// Empty class derived from nsIAtom so that function signatures can
// require an atom from this atom list.
class nsICSSPseudoElement : public nsIAtom {};
class nsCSSPseudoElements
{
typedef mozilla::CSSPseudoElementType Type;
typedef mozilla::CSSEnabledState EnabledState;
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
static Type GetPseudoType(nsIAtom* aAtom, EnabledState aEnabledState);
// Get the atom for a given Type. aType must be < CSSPseudoElementType::Count
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 < Type::Count);
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 IsEnabled(Type aType, EnabledState aEnabledState)
{
return !PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_UA_SHEET_ONLY) ||
(aEnabledState & EnabledState::eInUASheets);
}
private:
// Does the given pseudo-element have all of the flags given?
// Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64037 ,
// which is a general gcc bug that we seem to have hit only on Android/x86.
#if defined(ANDROID) && defined(__i386__) && defined(__GNUC__) && \
!defined(__clang__)
#if (MOZ_GCC_VERSION_AT_MOST(4,9,2))
__attribute__((noinline))
#endif
#endif
static bool PseudoElementHasFlags(const Type aType, uint32_t aFlags)
{
MOZ_ASSERT(aType < Type::Count);
return (kPseudoElementFlags[size_t(aType)] & aFlags) == aFlags;
}
static const uint32_t kPseudoElementFlags[size_t(Type::Count)];
};
#endif /* nsCSSPseudoElements_h___ */
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