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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 "third_party/blink/renderer/core/html/html_content_element.h"
#include "third_party/blink/renderer/core/css/parser/css_parser.h"
#include "third_party/blink/renderer/core/css/selector_checker.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/qualified_name.h"
#include "third_party/blink/renderer/core/dom/shadow_root.h"
#include "third_party/blink/renderer/core/dom/shadow_root_v0.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
namespace blink {
HTMLContentElement::HTMLContentElement(Document& document)
: V0InsertionPoint(html_names::kContentTag, document),
should_parse_select_(false),
is_valid_selector_(true) {
UseCounter::Count(document, WebFeature::kHTMLContentElement);
}
HTMLContentElement::~HTMLContentElement() = default;
void HTMLContentElement::Trace(Visitor* visitor) {
V0InsertionPoint::Trace(visitor);
}
void HTMLContentElement::ParseSelect() {
DCHECK(should_parse_select_);
selector_list_ = CSSParser::ParseSelector(
MakeGarbageCollected<CSSParserContext>(GetDocument()), nullptr, select_);
should_parse_select_ = false;
is_valid_selector_ = ValidateSelect();
if (!is_valid_selector_)
selector_list_ = CSSSelectorList();
}
void HTMLContentElement::ParseAttribute(
const AttributeModificationParams& params) {
if (params.name == html_names::kSelectAttr) {
if (ShadowRoot* root = ContainingShadowRoot()) {
if (!root->IsV1())
root->V0().WillAffectSelector();
}
should_parse_select_ = true;
select_ = params.new_value;
} else {
V0InsertionPoint::ParseAttribute(params);
}
}
static inline bool IncludesDisallowedPseudoClass(const CSSSelector& selector) {
if (selector.GetPseudoType() == CSSSelector::kPseudoNot) {
const CSSSelector* sub_selector = selector.SelectorList()->First();
return sub_selector->Match() == CSSSelector::kPseudoClass;
}
return selector.Match() == CSSSelector::kPseudoClass;
}
bool HTMLContentElement::ValidateSelect() const {
DCHECK(!should_parse_select_);
if (select_.IsNull() || select_.IsEmpty())
return true;
if (!selector_list_.IsValid())
return false;
for (const CSSSelector* selector = selector_list_.First(); selector;
selector = selector_list_.Next(*selector)) {
if (!selector->IsCompound())
return false;
for (const CSSSelector* sub_selector = selector; sub_selector;
sub_selector = sub_selector->TagHistory()) {
if (IncludesDisallowedPseudoClass(*sub_selector))
return false;
}
}
return true;
}
// TODO(esprehn): element should really be const, but matching a selector is not
// const for some SelectorCheckingModes (mainly ResolvingStyle) where it sets
// dynamic restyle flags on elements.
bool HTMLContentElement::MatchSelector(Element& element) const {
SelectorChecker::Init init;
init.mode = SelectorChecker::kQueryingRules;
SelectorChecker checker(init);
SelectorChecker::SelectorCheckingContext context(
&element, SelectorChecker::kVisitedMatchDisabled);
for (const CSSSelector* selector = SelectorList().First(); selector;
selector = CSSSelectorList::Next(*selector)) {
context.selector = selector;
if (checker.Match(context))
return true;
}
return false;
}
} // namespace blink
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