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/*
* Copyright (C) 2004 Zack Rusin <zack@kde.org>
* Copyright (C) 2004-2021 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
* Copyright (C) 2011 Sencha, Inc. All rights reserved.
* Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "config.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSProperty.h"
#include "CSSPropertyAnimation.h"
#include "CSSPropertyParser.h"
#include "CSSSelector.h"
#include "CSSSelectorParser.h"
#include "CSSSerializationContext.h"
#include "CSSValuePool.h"
#include "ComposedTreeAncestorIterator.h"
#include "ComputedStyleExtractor.h"
#include "DeprecatedCSSOMValue.h"
#include "RenderBox.h"
#include "RenderBoxModelObject.h"
#include "RenderStyleInlines.h"
#include "ShorthandSerializer.h"
#include "StylePropertiesInlines.h"
#include "StylePropertyShorthand.h"
#include "StyleScope.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(CSSComputedStyleDeclaration);
CSSComputedStyleDeclaration::CSSComputedStyleDeclaration(Element& element, AllowVisited allowVisited)
: m_element(element)
, m_allowVisitedStyle(allowVisited == AllowVisited::Yes)
{
}
CSSComputedStyleDeclaration::CSSComputedStyleDeclaration(Element& element, IsEmpty isEmpty)
: m_element(element)
, m_isEmpty(isEmpty == IsEmpty::Yes)
{
}
CSSComputedStyleDeclaration::CSSComputedStyleDeclaration(Element& element, const std::optional<Style::PseudoElementIdentifier>& pseudoElementIdentifier)
: m_element(element)
, m_pseudoElementIdentifier(pseudoElementIdentifier)
{
}
CSSComputedStyleDeclaration::~CSSComputedStyleDeclaration() = default;
Ref<CSSComputedStyleDeclaration> CSSComputedStyleDeclaration::create(Element& element, AllowVisited allowVisited)
{
return adoptRef(*new CSSComputedStyleDeclaration(element, allowVisited));
}
Ref<CSSComputedStyleDeclaration> CSSComputedStyleDeclaration::create(Element& element, const std::optional<Style::PseudoElementIdentifier>& pseudoElementIdentifier)
{
return adoptRef(*new CSSComputedStyleDeclaration(element, pseudoElementIdentifier));
}
Ref<CSSComputedStyleDeclaration> CSSComputedStyleDeclaration::createEmpty(Element& element)
{
return adoptRef(*new CSSComputedStyleDeclaration(element, IsEmpty::Yes));
}
String CSSComputedStyleDeclaration::cssText() const
{
return emptyString();
}
ExceptionOr<void> CSSComputedStyleDeclaration::setCssText(const String&)
{
return Exception { ExceptionCode::NoModificationAllowedError };
}
// In CSS 2.1 the returned object should actually contain the "used values"
// rather then the "computed values" (despite the name saying otherwise).
//
// See;
// http://www.w3.org/TR/CSS21/cascade.html#used-value
// http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSStyleDeclaration
// https://developer.mozilla.org/en-US/docs/Web/API/Window/getComputedStyle#Notes
RefPtr<CSSValue> CSSComputedStyleDeclaration::getPropertyCSSValue(CSSPropertyID propertyID, ComputedStyleExtractor::UpdateLayout updateLayout) const
{
if (!isExposed(propertyID, settings()) || m_isEmpty)
return nullptr;
return ComputedStyleExtractor(m_element.ptr(), m_allowVisitedStyle, m_pseudoElementIdentifier).propertyValue(propertyID, updateLayout);
}
Ref<MutableStyleProperties> CSSComputedStyleDeclaration::copyProperties() const
{
if (m_isEmpty)
return MutableStyleProperties::create();
return ComputedStyleExtractor(m_element.ptr(), m_allowVisitedStyle, m_pseudoElementIdentifier).copyProperties();
}
const Settings* CSSComputedStyleDeclaration::settings() const
{
return &m_element->document().settings();
}
const FixedVector<CSSPropertyID>& CSSComputedStyleDeclaration::exposedComputedCSSPropertyIDs() const
{
return m_element->document().exposedComputedCSSPropertyIDs();
}
String CSSComputedStyleDeclaration::getPropertyValue(CSSPropertyID propertyID) const
{
if (m_isEmpty)
return emptyString(); // FIXME: Should this be null instead, as it is in StyleProperties::getPropertyValue?
auto canUseShorthandSerializerForPropertyValue = [&]() {
switch (propertyID) {
case CSSPropertyGap:
case CSSPropertyGridArea:
case CSSPropertyGridColumn:
case CSSPropertyGridRow:
case CSSPropertyGridTemplate:
return true;
default:
return false;
}
};
if (isShorthand(propertyID) && canUseShorthandSerializerForPropertyValue())
return serializeShorthandValue(CSS::defaultSerializationContext(), { m_element.ptr(), m_allowVisitedStyle, m_pseudoElementIdentifier }, propertyID);
auto value = getPropertyCSSValue(propertyID);
if (!value)
return emptyString(); // FIXME: Should this be null instead, as it is in StyleProperties::getPropertyValue?
return value->cssText(CSS::defaultSerializationContext());
}
unsigned CSSComputedStyleDeclaration::length() const
{
if (m_isEmpty)
return 0;
ComputedStyleExtractor::updateStyleIfNeededForProperty(m_element.get(), CSSPropertyCustom);
auto* style = m_element->computedStyle(m_pseudoElementIdentifier);
if (!style)
return 0;
return exposedComputedCSSPropertyIDs().size() + style->inheritedCustomProperties().size() + style->nonInheritedCustomProperties().size();
}
String CSSComputedStyleDeclaration::item(unsigned i) const
{
if (m_isEmpty)
return String();
if (i >= length())
return String();
if (i < exposedComputedCSSPropertyIDs().size())
return nameString(exposedComputedCSSPropertyIDs().at(i));
auto* style = m_element->computedStyle(m_pseudoElementIdentifier);
if (!style)
return String();
const auto& inheritedCustomProperties = style->inheritedCustomProperties();
// FIXME: findKeyAtIndex does a linear search for the property name, so if
// we are called in a loop over all item indexes, we'll spend quadratic time
// searching for keys.
if (i < exposedComputedCSSPropertyIDs().size() + inheritedCustomProperties.size())
return inheritedCustomProperties.findKeyAtIndex(i - exposedComputedCSSPropertyIDs().size());
const auto& nonInheritedCustomProperties = style->nonInheritedCustomProperties();
return nonInheritedCustomProperties.findKeyAtIndex(i - inheritedCustomProperties.size() - exposedComputedCSSPropertyIDs().size());
}
CSSRule* CSSComputedStyleDeclaration::parentRule() const
{
return nullptr;
}
CSSRule* CSSComputedStyleDeclaration::cssRules() const
{
return nullptr;
}
RefPtr<DeprecatedCSSOMValue> CSSComputedStyleDeclaration::getPropertyCSSValue(const String& propertyName)
{
if (m_isEmpty)
return nullptr;
if (isCustomPropertyName(propertyName)) {
auto value = ComputedStyleExtractor(m_element.ptr(), m_allowVisitedStyle, m_pseudoElementIdentifier).customPropertyValue(AtomString { propertyName });
if (!value)
return nullptr;
return value->createDeprecatedCSSOMWrapper(*this);
}
CSSPropertyID propertyID = cssPropertyID(propertyName);
if (!propertyID)
return nullptr;
auto value = getPropertyCSSValue(propertyID);
if (!value)
return nullptr;
return value->createDeprecatedCSSOMWrapper(*this);
}
String CSSComputedStyleDeclaration::getPropertyValue(const String &propertyName)
{
if (m_isEmpty)
return String();
if (isCustomPropertyName(propertyName))
return ComputedStyleExtractor(m_element.ptr(), m_allowVisitedStyle, m_pseudoElementIdentifier).customPropertyText(AtomString { propertyName });
CSSPropertyID propertyID = cssPropertyID(propertyName);
if (!propertyID)
return String();
return getPropertyValue(propertyID);
}
String CSSComputedStyleDeclaration::getPropertyPriority(const String&)
{
// All computed styles have a priority of not "important".
return emptyString();
}
String CSSComputedStyleDeclaration::getPropertyShorthand(const String&)
{
return emptyString(); // FIXME: Should this sometimes be null instead of empty, to match a normal style declaration?
}
bool CSSComputedStyleDeclaration::isPropertyImplicit(const String&)
{
return false;
}
ExceptionOr<void> CSSComputedStyleDeclaration::setProperty(const String&, const String&, const String&)
{
return Exception { ExceptionCode::NoModificationAllowedError };
}
ExceptionOr<String> CSSComputedStyleDeclaration::removeProperty(const String&)
{
return Exception { ExceptionCode::NoModificationAllowedError };
}
String CSSComputedStyleDeclaration::getPropertyValueInternal(CSSPropertyID propertyID)
{
return getPropertyValue(propertyID);
}
ExceptionOr<void> CSSComputedStyleDeclaration::setPropertyInternal(CSSPropertyID, const String&, IsImportant)
{
return Exception { ExceptionCode::NoModificationAllowedError };
}
} // namespace WebCore
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