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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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layout/style/nsCSSPseudoClasses.h Normal file
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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___ */