root/Source/core/css/PropertySetCSSStyleDeclaration.cpp

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DEFINITIONS

This source file includes following definitions.
  1. enqueueMutationRecord
  2. didInvalidateStyleAttr
  3. ref
  4. deref
  5. length
  6. item
  7. cssText
  8. setCSSText
  9. getPropertyCSSValue
  10. getPropertyValue
  11. getPropertyPriority
  12. getPropertyShorthand
  13. isPropertyImplicit
  14. setProperty
  15. removeProperty
  16. getPropertyCSSValueInternal
  17. getPropertyValueInternal
  18. setPropertyInternal
  19. cloneAndCacheForCSSOM
  20. contextStyleSheet
  21. copyProperties
  22. cssPropertyMatches
  23. m_parentRule
  24. ref
  25. deref
  26. willMutate
  27. didMutate
  28. parentStyleSheet
  29. reattach
  30. propertySet
  31. didMutate
  32. parentStyleSheet
  33. ref
  34. deref

/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
 * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "core/css/PropertySetCSSStyleDeclaration.h"

#include "HTMLNames.h"
#include "RuntimeEnabledFeatures.h"
#include "bindings/v8/ExceptionState.h"
#include "core/css/parser/BisonCSSParser.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/StylePropertySet.h"
#include "core/dom/Element.h"
#include "core/dom/MutationObserverInterestGroup.h"
#include "core/dom/MutationRecord.h"
#include "core/inspector/InspectorInstrumentation.h"

using namespace std;

namespace WebCore {

namespace {

class StyleAttributeMutationScope {
    WTF_MAKE_NONCOPYABLE(StyleAttributeMutationScope);
public:
    StyleAttributeMutationScope(AbstractPropertySetCSSStyleDeclaration* decl)
    {
        InspectorInstrumentation::willMutateStyle(decl);
        ++s_scopeCount;

        if (s_scopeCount != 1) {
            ASSERT(s_currentDecl == decl);
            return;
        }

        ASSERT(!s_currentDecl);
        s_currentDecl = decl;

        if (!s_currentDecl->parentElement())
            return;

        bool shouldReadOldValue = false;

        m_mutationRecipients = MutationObserverInterestGroup::createForAttributesMutation(*s_currentDecl->parentElement(), HTMLNames::styleAttr);
        if (m_mutationRecipients && m_mutationRecipients->isOldValueRequested())
            shouldReadOldValue = true;

        AtomicString oldValue;
        if (shouldReadOldValue)
            oldValue = s_currentDecl->parentElement()->getAttribute(HTMLNames::styleAttr);

        if (m_mutationRecipients) {
            AtomicString requestedOldValue = m_mutationRecipients->isOldValueRequested() ? oldValue : nullAtom;
            m_mutation = MutationRecord::createAttributes(s_currentDecl->parentElement(), HTMLNames::styleAttr, requestedOldValue);
        }
    }

    ~StyleAttributeMutationScope()
    {
        --s_scopeCount;
        if (s_scopeCount)
            return;

        if (m_mutation && s_shouldDeliver)
            m_mutationRecipients->enqueueMutationRecord(m_mutation);

        s_shouldDeliver = false;

        // We have to clear internal state before calling Inspector's code.
        AbstractPropertySetCSSStyleDeclaration* localCopyStyleDecl = s_currentDecl;
        s_currentDecl = 0;
        InspectorInstrumentation::didMutateStyle(localCopyStyleDecl, localCopyStyleDecl->parentElement());

        if (!s_shouldNotifyInspector)
            return;

        s_shouldNotifyInspector = false;
        if (localCopyStyleDecl->parentElement())
            InspectorInstrumentation::didInvalidateStyleAttr(localCopyStyleDecl->parentElement());
    }

    void enqueueMutationRecord()
    {
        s_shouldDeliver = true;
    }

    void didInvalidateStyleAttr()
    {
        s_shouldNotifyInspector = true;
    }

private:
    static unsigned s_scopeCount;
    static AbstractPropertySetCSSStyleDeclaration* s_currentDecl;
    static bool s_shouldNotifyInspector;
    static bool s_shouldDeliver;

    OwnPtr<MutationObserverInterestGroup> m_mutationRecipients;
    RefPtr<MutationRecord> m_mutation;
};

unsigned StyleAttributeMutationScope::s_scopeCount = 0;
AbstractPropertySetCSSStyleDeclaration* StyleAttributeMutationScope::s_currentDecl = 0;
bool StyleAttributeMutationScope::s_shouldNotifyInspector = false;
bool StyleAttributeMutationScope::s_shouldDeliver = false;

} // namespace

void PropertySetCSSStyleDeclaration::ref()
{
    m_propertySet->ref();
}

void PropertySetCSSStyleDeclaration::deref()
{
    m_propertySet->deref();
}

unsigned AbstractPropertySetCSSStyleDeclaration::length() const
{
    return propertySet().propertyCount();
}

String AbstractPropertySetCSSStyleDeclaration::item(unsigned i) const
{
    if (i >= propertySet().propertyCount())
        return "";
    return propertySet().propertyAt(i).cssName();
}

String AbstractPropertySetCSSStyleDeclaration::cssText() const
{
    return propertySet().asText();
}

void AbstractPropertySetCSSStyleDeclaration::setCSSText(const String& text, ExceptionState& exceptionState)
{
    StyleAttributeMutationScope mutationScope(this);
    willMutate();

    // FIXME: Detect syntax errors and set exceptionState.
    propertySet().parseDeclaration(text, contextStyleSheet());

    didMutate(PropertyChanged);

    mutationScope.enqueueMutationRecord();
}

PassRefPtrWillBeRawPtr<CSSValue> AbstractPropertySetCSSStyleDeclaration::getPropertyCSSValue(const String& propertyName)
{
    CSSPropertyID propertyID = cssPropertyID(propertyName);
    if (!propertyID)
        return nullptr;
    return cloneAndCacheForCSSOM(propertySet().getPropertyCSSValue(propertyID).get());
}

String AbstractPropertySetCSSStyleDeclaration::getPropertyValue(const String &propertyName)
{
    CSSPropertyID propertyID = cssPropertyID(propertyName);
    if (!propertyID)
        return String();
    return propertySet().getPropertyValue(propertyID);
}

String AbstractPropertySetCSSStyleDeclaration::getPropertyPriority(const String& propertyName)
{
    CSSPropertyID propertyID = cssPropertyID(propertyName);
    if (!propertyID)
        return String();
    return propertySet().propertyIsImportant(propertyID) ? "important" : "";
}

String AbstractPropertySetCSSStyleDeclaration::getPropertyShorthand(const String& propertyName)
{
    CSSPropertyID propertyID = cssPropertyID(propertyName);
    if (!propertyID)
        return String();
    CSSPropertyID shorthandID = propertySet().getPropertyShorthand(propertyID);
    if (!shorthandID)
        return String();
    return getPropertyNameString(shorthandID);
}

bool AbstractPropertySetCSSStyleDeclaration::isPropertyImplicit(const String& propertyName)
{
    CSSPropertyID propertyID = cssPropertyID(propertyName);
    if (!propertyID)
        return false;
    return propertySet().isPropertyImplicit(propertyID);
}

void AbstractPropertySetCSSStyleDeclaration::setProperty(const String& propertyName, const String& value, const String& priority, ExceptionState& exceptionState)
{
    CSSPropertyID propertyID = cssPropertyID(propertyName);
    if (!propertyID)
        return;

    bool important = equalIgnoringCase(priority, "important");
    if (!important && !priority.isEmpty())
        return;

    setPropertyInternal(propertyID, value, important, exceptionState);
}

String AbstractPropertySetCSSStyleDeclaration::removeProperty(const String& propertyName, ExceptionState& exceptionState)
{
    StyleAttributeMutationScope mutationScope(this);
    CSSPropertyID propertyID = cssPropertyID(propertyName);
    if (!propertyID)
        return String();

    willMutate();

    String result;
    bool changed = propertySet().removeProperty(propertyID, &result);

    didMutate(changed ? PropertyChanged : NoChanges);

    if (changed)
        mutationScope.enqueueMutationRecord();
    return result;
}

PassRefPtrWillBeRawPtr<CSSValue> AbstractPropertySetCSSStyleDeclaration::getPropertyCSSValueInternal(CSSPropertyID propertyID)
{
    return propertySet().getPropertyCSSValue(propertyID);
}

String AbstractPropertySetCSSStyleDeclaration::getPropertyValueInternal(CSSPropertyID propertyID)
{
    return propertySet().getPropertyValue(propertyID);
}

void AbstractPropertySetCSSStyleDeclaration::setPropertyInternal(CSSPropertyID propertyID, const String& value, bool important, ExceptionState&)
{
    StyleAttributeMutationScope mutationScope(this);
    willMutate();

    bool changed = propertySet().setProperty(propertyID, value, important, contextStyleSheet());

    didMutate(changed ? PropertyChanged : NoChanges);

    if (changed)
        mutationScope.enqueueMutationRecord();
}

CSSValue* AbstractPropertySetCSSStyleDeclaration::cloneAndCacheForCSSOM(CSSValue* internalValue)
{
    if (!internalValue)
        return 0;

    // The map is here to maintain the object identity of the CSSValues over multiple invocations.
    // FIXME: It is likely that the identity is not important for web compatibility and this code should be removed.
    if (!m_cssomCSSValueClones)
        m_cssomCSSValueClones = adoptPtrWillBeNoop(new WillBeHeapHashMap<CSSValue*, RefPtrWillBeMember<CSSValue> >);

    RefPtrWillBeMember<CSSValue>& clonedValue = m_cssomCSSValueClones->add(internalValue, RefPtrWillBeMember<CSSValue>()).storedValue->value;
    if (!clonedValue)
        clonedValue = internalValue->cloneForCSSOM();
    return clonedValue.get();
}

StyleSheetContents* AbstractPropertySetCSSStyleDeclaration::contextStyleSheet() const
{
    CSSStyleSheet* cssStyleSheet = parentStyleSheet();
    return cssStyleSheet ? cssStyleSheet->contents() : 0;
}

PassRefPtrWillBeRawPtr<MutableStylePropertySet> AbstractPropertySetCSSStyleDeclaration::copyProperties() const
{
    return propertySet().mutableCopy();
}

bool AbstractPropertySetCSSStyleDeclaration::cssPropertyMatches(CSSPropertyID propertyID, const CSSValue* propertyValue) const
{
    return propertySet().propertyMatches(propertyID, propertyValue);
}

StyleRuleCSSStyleDeclaration::StyleRuleCSSStyleDeclaration(MutableStylePropertySet& propertySetArg, CSSRule* parentRule)
    : PropertySetCSSStyleDeclaration(propertySetArg)
    , m_refCount(1)
    , m_parentRule(parentRule)
{
    m_propertySet->ref();
}

StyleRuleCSSStyleDeclaration::~StyleRuleCSSStyleDeclaration()
{
    m_propertySet->deref();
}

void StyleRuleCSSStyleDeclaration::ref()
{
    ++m_refCount;
}

void StyleRuleCSSStyleDeclaration::deref()
{
    ASSERT(m_refCount);
    if (!--m_refCount)
        delete this;
}

void StyleRuleCSSStyleDeclaration::willMutate()
{
    if (m_parentRule && m_parentRule->parentStyleSheet())
        m_parentRule->parentStyleSheet()->willMutateRules();
}

void StyleRuleCSSStyleDeclaration::didMutate(MutationType type)
{
    if (type == PropertyChanged)
        m_cssomCSSValueClones.clear();

    // Style sheet mutation needs to be signaled even if the change failed. willMutateRules/didMutateRules must pair.
    if (m_parentRule && m_parentRule->parentStyleSheet())
        m_parentRule->parentStyleSheet()->didMutateRules();
}

CSSStyleSheet* StyleRuleCSSStyleDeclaration::parentStyleSheet() const
{
    return m_parentRule ? m_parentRule->parentStyleSheet() : 0;
}

void StyleRuleCSSStyleDeclaration::reattach(MutableStylePropertySet& propertySet)
{
    m_propertySet->deref();
    m_propertySet = &propertySet;
    m_propertySet->ref();
}

MutableStylePropertySet& InlineCSSStyleDeclaration::propertySet() const
{
    return m_parentElement->ensureMutableInlineStyle();
}

void InlineCSSStyleDeclaration::didMutate(MutationType type)
{
    if (type == NoChanges)
        return;

    m_cssomCSSValueClones.clear();

    if (!m_parentElement)
        return;

    m_parentElement->clearMutableInlineStyleIfEmpty();
    m_parentElement->setNeedsStyleRecalc(LocalStyleChange);
    m_parentElement->invalidateStyleAttribute();
    StyleAttributeMutationScope(this).didInvalidateStyleAttr();
}

CSSStyleSheet* InlineCSSStyleDeclaration::parentStyleSheet() const
{
    return m_parentElement ? &m_parentElement->document().elementSheet() : 0;
}

void InlineCSSStyleDeclaration::ref()
{
    m_parentElement->ref();
}

void InlineCSSStyleDeclaration::deref()
{
    m_parentElement->deref();
}

} // namespace WebCore

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