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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
/* atom list for CSS pseudo-elements */
#include "nsCSSPseudoElements.h"
#include "mozilla/ArrayUtils.h"
#include "nsCSSAnonBoxes.h"
#include "nsDOMString.h"
#include "nsGkAtomConsts.h"
#include "nsStaticAtomUtils.h"
#include "nsStringFwd.h"
using namespace mozilla;
// Flags data for each of the pseudo-elements.
/* static */ const uint32_t nsCSSPseudoElements::kPseudoElementFlags[] = {
#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) flags_,
#include "nsCSSPseudoElementList.h"
#undef CSS_PSEUDO_ELEMENT
};
/* static */
nsStaticAtom* nsCSSPseudoElements::GetAtomBase() {
return const_cast<nsStaticAtom*>(
nsGkAtoms::GetAtomByIndex(kAtomIndex_PseudoElements));
}
/* static */
nsAtom* nsCSSPseudoElements::GetPseudoAtom(Type aType) {
MOZ_ASSERT(PseudoStyle::IsPseudoElement(aType), "Unexpected type");
size_t index = kAtomIndex_PseudoElements + static_cast<size_t>(aType);
return nsGkAtoms::GetAtomByIndex(index);
}
static bool IsFunctionalPseudo(PseudoStyleType aType) {
return aType == PseudoStyleType::highlight ||
PseudoStyle::IsNamedViewTransitionPseudoElement(aType);
}
/* static */
Maybe<PseudoStyleRequest> nsCSSPseudoElements::ParsePseudoElement(
const nsAString& aPseudoElement, CSSEnabledState aEnabledState) {
if (DOMStringIsNull(aPseudoElement) || aPseudoElement.IsEmpty()) {
return Some(PseudoStyleRequest());
}
if (aPseudoElement.First() != char16_t(':')) {
return Nothing();
}
// deal with two-colon forms of aPseudoElt
const char16_t* start = aPseudoElement.BeginReading();
const char16_t* end = aPseudoElement.EndReading();
NS_ASSERTION(start != end, "aPseudoElement is not empty!");
++start;
bool haveTwoColons = true;
if (start == end || *start != char16_t(':')) {
--start;
haveTwoColons = false;
}
// XXX jjaschke: this parsing algorithm should be replaced by the css parser
const int32_t parameterPosition = aPseudoElement.FindChar('(');
const bool hasParameter = parameterPosition != kNotFound;
if (hasParameter) {
end = start + parameterPosition - 1;
}
RefPtr<nsAtom> pseudo = NS_Atomize(Substring(start, end));
MOZ_ASSERT(pseudo);
Maybe<uint32_t> index = nsStaticAtomUtils::Lookup(pseudo, GetAtomBase(),
kAtomCount_PseudoElements);
if (index.isNothing()) {
return Nothing();
}
auto type = static_cast<Type>(*index);
RefPtr<nsAtom> functionalPseudoParameter;
if (hasParameter) {
if (!IsFunctionalPseudo(type)) {
return Nothing();
}
functionalPseudoParameter =
[&aPseudoElement, parameterPosition]() -> already_AddRefed<nsAtom> {
const char16_t* start = aPseudoElement.BeginReading();
const char16_t* end = aPseudoElement.EndReading();
start += parameterPosition + 1;
--end;
if (*end != ')') {
return nullptr;
}
return NS_Atomize(Substring(start, end));
}();
// The universal selector is pre-defined and should not be a valid name for
// a named view-transition pseudo element.
if (PseudoStyle::IsNamedViewTransitionPseudoElement(type) &&
functionalPseudoParameter == nsGkAtoms::_asterisk) {
return Nothing();
}
}
if (!haveTwoColons &&
!PseudoElementHasFlags(type, CSS_PSEUDO_ELEMENT_IS_CSS2)) {
return Nothing();
}
if (IsEnabled(type, aEnabledState)) {
return Some(PseudoStyleRequest{type, functionalPseudoParameter});
}
return Nothing();
}
/* static */
bool nsCSSPseudoElements::PseudoElementSupportsUserActionState(
const Type aType) {
return PseudoElementHasFlags(aType,
CSS_PSEUDO_ELEMENT_SUPPORTS_USER_ACTION_STATE);
}
/* static */
nsString nsCSSPseudoElements::PseudoRequestAsString(
const Request& aPseudoRequest) {
switch (aPseudoRequest.mType) {
case PseudoStyleType::before:
return u"::before"_ns;
case PseudoStyleType::after:
return u"::after"_ns;
case PseudoStyleType::marker:
return u"::marker"_ns;
case PseudoStyleType::viewTransition:
return u"::view-transition"_ns;
case PseudoStyleType::viewTransitionGroup:
return u"::view-transition-group("_ns +
nsAtomString(aPseudoRequest.mIdentifier) + u")"_ns;
case PseudoStyleType::viewTransitionImagePair:
return u"::view-transition-image-pair("_ns +
nsAtomString(aPseudoRequest.mIdentifier) + u")"_ns;
case PseudoStyleType::viewTransitionOld:
return u"::view-transition-old("_ns +
nsAtomString(aPseudoRequest.mIdentifier) + u")"_ns;
case PseudoStyleType::viewTransitionNew:
return u"::view-transition-new("_ns +
nsAtomString(aPseudoRequest.mIdentifier) + u")"_ns;
default:
MOZ_ASSERT(aPseudoRequest.IsNotPseudo(), "Unexpected pseudo type");
return u""_ns;
}
}
#ifdef DEBUG
/* static */
void nsCSSPseudoElements::AssertAtoms() {
nsStaticAtom* base = GetAtomBase();
# define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
{ \
RefPtr<nsAtom> atom = NS_Atomize(value_); \
size_t index = static_cast<size_t>(PseudoStyleType::name_); \
MOZ_ASSERT(atom == nsGkAtoms::PseudoElement_##name_, \
"Static atom for " #name_ " has incorrect value"); \
MOZ_ASSERT(atom == &base[index], \
"Static atom for " #name_ " not at expected index"); \
}
# include "nsCSSPseudoElementList.h"
# undef CSS_PSEUDO_ELEMENT
}
#endif