1 /*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Neither the name of Google Inc. nor the names of its
11 * contributors may be used to endorse or promote products derived from
12 * this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "config.h"
28 #include "core/html/HTMLContentElement.h"
29
30 #include "core/HTMLNames.h"
31 #include "core/css/SelectorChecker.h"
32 #include "core/css/SiblingTraversalStrategies.h"
33 #include "core/css/parser/CSSParser.h"
34 #include "core/dom/QualifiedName.h"
35 #include "core/dom/shadow/ElementShadow.h"
36 #include "core/dom/shadow/ShadowRoot.h"
37 #include "platform/RuntimeEnabledFeatures.h"
38
39 namespace blink {
40
41 using namespace HTMLNames;
42
HTMLContentElement(Document & document)43 inline HTMLContentElement::HTMLContentElement(Document& document)
44 : InsertionPoint(contentTag, document)
45 , m_shouldParseSelect(false)
46 , m_isValidSelector(true)
47 {
48 }
49
DEFINE_NODE_FACTORY(HTMLContentElement)50 DEFINE_NODE_FACTORY(HTMLContentElement)
51
52 HTMLContentElement::~HTMLContentElement()
53 {
54 }
55
parseSelect()56 void HTMLContentElement::parseSelect()
57 {
58 ASSERT(m_shouldParseSelect);
59
60 CSSParser parser(CSSParserContext(document(), 0));
61 parser.parseSelector(m_select, m_selectorList);
62 m_shouldParseSelect = false;
63 m_isValidSelector = validateSelect();
64 if (!m_isValidSelector) {
65 CSSSelectorList emptyList;
66 m_selectorList.adopt(emptyList);
67 }
68 }
69
parseAttribute(const QualifiedName & name,const AtomicString & value)70 void HTMLContentElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
71 {
72 if (name == selectAttr) {
73 if (ShadowRoot* root = containingShadowRoot())
74 root->owner()->willAffectSelector();
75 m_shouldParseSelect = true;
76 m_select = value;
77 } else {
78 InsertionPoint::parseAttribute(name, value);
79 }
80 }
81
includesDisallowedPseudoClass(const CSSSelector & selector)82 static inline bool includesDisallowedPseudoClass(const CSSSelector& selector)
83 {
84 if (selector.pseudoType() == CSSSelector::PseudoNot) {
85 const CSSSelector* subSelector = selector.selectorList()->first();
86 return subSelector->match() == CSSSelector::PseudoClass;
87 }
88 return selector.match() == CSSSelector::PseudoClass;
89 }
90
validateSelect() const91 bool HTMLContentElement::validateSelect() const
92 {
93 ASSERT(!m_shouldParseSelect);
94
95 if (m_select.isNull() || m_select.isEmpty())
96 return true;
97
98 if (!m_selectorList.isValid())
99 return false;
100
101 bool allowAnyPseudoClasses = RuntimeEnabledFeatures::pseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled() || (containingShadowRoot() && containingShadowRoot()->type() == ShadowRoot::UserAgentShadowRoot);
102
103 for (const CSSSelector* selector = m_selectorList.first(); selector; selector = m_selectorList.next(*selector)) {
104 if (!selector->isCompound())
105 return false;
106 if (allowAnyPseudoClasses)
107 continue;
108 for (const CSSSelector* subSelector = selector; subSelector; subSelector = subSelector->tagHistory()) {
109 if (includesDisallowedPseudoClass(*subSelector))
110 return false;
111 }
112 }
113 return true;
114 }
115
checkOneSelector(const CSSSelector & selector,const WillBeHeapVector<RawPtrWillBeMember<Node>,32> & siblings,int nth)116 static inline bool checkOneSelector(const CSSSelector& selector, const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth)
117 {
118 Element* element = toElement(siblings[nth]);
119 SelectorChecker selectorChecker(element->document(), SelectorChecker::CollectingCSSRules);
120 SelectorChecker::SelectorCheckingContext context(selector, element, SelectorChecker::VisitedMatchEnabled);
121 ShadowDOMSiblingTraversalStrategy strategy(siblings, nth);
122 return selectorChecker.match(context, strategy) == SelectorChecker::SelectorMatches;
123 }
124
matchSelector(const WillBeHeapVector<RawPtrWillBeMember<Node>,32> & siblings,int nth) const125 bool HTMLContentElement::matchSelector(const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth) const
126 {
127 for (const CSSSelector* selector = selectorList().first(); selector; selector = CSSSelectorList::next(*selector)) {
128 if (checkOneSelector(*selector, siblings, nth))
129 return true;
130 }
131 return false;
132 }
133
134 }
135