gecko-dev/layout/style/nsCSSAnonBoxes.h

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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 anonymous boxes */
#ifndef nsCSSAnonBoxes_h___
#define nsCSSAnonBoxes_h___
#include "nsAtom.h"
#include "nsGkAtoms.h"
class nsCSSAnonBoxes {
public:
static bool IsAnonBox(nsAtom *aAtom);
#ifdef MOZ_XUL
static bool IsTreePseudoElement(nsAtom* aPseudo);
#endif
static bool IsNonElement(nsAtom* aPseudo)
{
return aPseudo == nsCSSAnonBoxes::mozText() ||
aPseudo == nsCSSAnonBoxes::oofPlaceholder() ||
aPseudo == nsCSSAnonBoxes::firstLetterContinuation();
}
typedef uint8_t NonInheritingBase;
enum class NonInheriting : NonInheritingBase {
#define CSS_ANON_BOX(_name, _value) /* nothing */
#define CSS_NON_INHERITING_ANON_BOX(_name, _value) _name,
#include "nsCSSAnonBoxList.h"
#undef CSS_NON_INHERITING_ANON_BOX
#undef CSS_ANON_BOX
_Count
};
// Be careful using this: if we have a lot of non-inheriting anon box types it
// might not be very fast. We may want to think of ways to handle that
// (e.g. by moving to an enum instead of an atom, like we did for
// pseudo-elements, or by adding a new value of the pseudo-element enum for
// non-inheriting anon boxes or something).
static bool IsNonInheritingAnonBox(nsAtom* aPseudo)
{
return
#define CSS_ANON_BOX(_name, _value) /* nothing */
#define CSS_NON_INHERITING_ANON_BOX(_name, _value) \
nsGkAtoms::AnonBox_##_name == aPseudo ||
#include "nsCSSAnonBoxList.h"
#undef CSS_NON_INHERITING_ANON_BOX
#undef CSS_ANON_BOX
false;
}
#ifdef DEBUG
// NOTE(emilio): DEBUG only because this does a pretty slow linear search. Try
// to use IsNonInheritingAnonBox if you know the atom is an anon box already
// or, even better, nothing like this. Note that this function returns true
// for wrapper anon boxes as well, since they're all inheriting.
static bool IsInheritingAnonBox(nsAtom* aPseudo)
{
return
#define CSS_ANON_BOX(_name, _value) nsGkAtoms::AnonBox_##_name == aPseudo ||
#define CSS_NON_INHERITING_ANON_BOX(_name, _value) /* nothing */
#include "nsCSSAnonBoxList.h"
#undef CSS_NON_INHERITING_ANON_BOX
#undef CSS_ANON_BOX
false;
}
#endif // DEBUG
// This function is rather slow; you probably don't want to use it outside
// asserts unless you have to.
static bool IsWrapperAnonBox(nsAtom* aPseudo) {
// We commonly get null passed here, and want to quickly return false for
// it.
return aPseudo &&
(
#define CSS_ANON_BOX(_name, _value) /* nothing */
#define CSS_WRAPPER_ANON_BOX(_name, _value) nsGkAtoms::AnonBox_##_name == aPseudo ||
#define CSS_NON_INHERITING_ANON_BOX(_name, _value) /* nothing */
#include "nsCSSAnonBoxList.h"
#undef CSS_NON_INHERITING_ANON_BOX
#undef CSS_WRAPPER_ANON_BOX
#undef CSS_ANON_BOX
false);
}
// Get the NonInheriting type for a given pseudo tag. The pseudo tag must
// test true for IsNonInheritingAnonBox.
static NonInheriting NonInheritingTypeForPseudoTag(nsAtom* aPseudo);
#ifdef DEBUG
static void AssertAtoms();
#endif
// Alias nsCSSAnonBoxes::foo() to nsGkAtoms::AnonBox_foo.
#define CSS_ANON_BOX(name_, value_) \
static nsCSSAnonBoxPseudoStaticAtom* name_() \
{ \
return const_cast<nsCSSAnonBoxPseudoStaticAtom*>( \
static_cast<const nsCSSAnonBoxPseudoStaticAtom*>( \
nsGkAtoms::AnonBox_##name_)); \
}
#include "nsCSSAnonBoxList.h"
#undef CSS_ANON_BOX
};
#endif /* nsCSSAnonBoxes_h___ */