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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "HTMLContentElement.h"
#include "CSSParser.h"
#include "ContentDistributor.h"
#include "HTMLNames.h"
#include "QualifiedName.h"
#include "RuntimeEnabledFeatures.h"
#include "ShadowRoot.h"
namespace WebCore {
using HTMLNames::selectAttr;
#if ENABLE(SHADOW_DOM)
const QualifiedName& HTMLContentElement::contentTagName(Document*)
{
if (!RuntimeEnabledFeatures::shadowDOMEnabled())
return HTMLNames::webkitShadowContentTag;
return HTMLNames::contentTag;
}
PassRefPtr<HTMLContentElement> HTMLContentElement::create(Document* document)
{
return adoptRef(new HTMLContentElement(contentTagName(document), document));
}
PassRefPtr<HTMLContentElement> HTMLContentElement::create(const QualifiedName& tagName, Document* document)
{
return adoptRef(new HTMLContentElement(tagName, document));
}
HTMLContentElement::HTMLContentElement(const QualifiedName& name, Document* document)
: InsertionPoint(name, document)
, m_shouldParseSelectorList(false)
, m_isValidSelector(true)
{
}
HTMLContentElement::~HTMLContentElement()
{
}
InsertionPoint::MatchType HTMLContentElement::matchTypeFor(Node*)
{
if (select().isNull() || select().isEmpty())
return AlwaysMatches;
if (!isSelectValid())
return NeverMatches;
return HasToMatchSelector;
}
const AtomicString& HTMLContentElement::select() const
{
return getAttribute(selectAttr);
}
bool HTMLContentElement::isSelectValid()
{
ensureSelectParsed();
return m_isValidSelector;
}
void HTMLContentElement::ensureSelectParsed()
{
if (!m_shouldParseSelectorList)
return;
CSSParser parser(document());
parser.parseSelector(select(), m_selectorList);
m_shouldParseSelectorList = false;
m_isValidSelector = validateSelect();
if (!m_isValidSelector)
m_selectorList = CSSSelectorList();
}
void HTMLContentElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
if (name == selectAttr) {
if (ShadowRoot* root = containingShadowRoot())
root->owner()->willAffectSelector();
m_shouldParseSelectorList = true;
} else
InsertionPoint::parseAttribute(name, value);
}
static bool validateSubSelector(const CSSSelector* selector)
{
switch (selector->m_match) {
case CSSSelector::Tag:
case CSSSelector::Id:
case CSSSelector::Class:
case CSSSelector::Exact:
case CSSSelector::Set:
case CSSSelector::List:
case CSSSelector::Hyphen:
case CSSSelector::Contain:
case CSSSelector::Begin:
case CSSSelector::End:
return true;
case CSSSelector::PseudoElement:
return false;
case CSSSelector::PagePseudoClass:
case CSSSelector::PseudoClass:
break;
}
switch (selector->pseudoType()) {
case CSSSelector::PseudoEmpty:
case CSSSelector::PseudoLink:
case CSSSelector::PseudoVisited:
case CSSSelector::PseudoTarget:
case CSSSelector::PseudoEnabled:
case CSSSelector::PseudoDisabled:
case CSSSelector::PseudoChecked:
case CSSSelector::PseudoIndeterminate:
case CSSSelector::PseudoNthChild:
case CSSSelector::PseudoNthLastChild:
case CSSSelector::PseudoNthOfType:
case CSSSelector::PseudoNthLastOfType:
case CSSSelector::PseudoFirstChild:
case CSSSelector::PseudoLastChild:
case CSSSelector::PseudoFirstOfType:
case CSSSelector::PseudoLastOfType:
case CSSSelector::PseudoOnlyOfType:
return true;
default:
return false;
}
}
static bool validateSelector(const CSSSelector* selector)
{
ASSERT(selector);
if (!validateSubSelector(selector))
return false;
const CSSSelector* prevSubSelector = selector;
const CSSSelector* subSelector = selector->tagHistory();
while (subSelector) {
if (prevSubSelector->relation() != CSSSelector::SubSelector)
return false;
if (!validateSubSelector(subSelector))
return false;
prevSubSelector = subSelector;
subSelector = subSelector->tagHistory();
}
return true;
}
bool HTMLContentElement::validateSelect() const
{
ASSERT(!m_shouldParseSelectorList);
if (select().isNull() || select().isEmpty())
return true;
if (!m_selectorList.isValid())
return false;
for (const CSSSelector* selector = m_selectorList.first(); selector; selector = m_selectorList.next(selector)) {
if (!validateSelector(selector))
return false;
}
return true;
}
#endif // if ENABLE(SHADOW_DOM)
}
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