2 * Copyright (C) 2013 Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
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.
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.
28 #include "core/dom/StyleSheetCandidate.h"
30 #include "HTMLNames.h"
31 #include "core/dom/Element.h"
32 #include "core/dom/ProcessingInstruction.h"
33 #include "core/dom/StyleEngine.h"
34 #include "core/html/HTMLImport.h"
35 #include "core/html/HTMLLinkElement.h"
36 #include "core/html/HTMLStyleElement.h"
37 #include "core/svg/SVGStyleElement.h"
41 using namespace HTMLNames;
43 AtomicString StyleSheetCandidate::title() const
45 return isElement() ? toElement(m_node).fastGetAttribute(titleAttr) : nullAtom;
48 bool StyleSheetCandidate::isXSL() const
50 return !m_node.document().isHTMLDocument() && m_type == Pi && toProcessingInstruction(m_node).isXSL();
53 bool StyleSheetCandidate::isImport() const
55 return m_type == HTMLLink && toHTMLLinkElement(m_node).isImport();
58 Document* StyleSheetCandidate::importedDocument() const
61 // The stylesheet update traversal shouldn't go into shared import
62 // to prevent it from stepping into cycle.
63 HTMLLinkElement& element = toHTMLLinkElement(m_node);
64 if (!element.importOwnsLoader())
66 return element.import();
69 bool StyleSheetCandidate::isAlternate() const
73 return toElement(m_node).getAttribute(relAttr).contains("alternate");
76 bool StyleSheetCandidate::isEnabledViaScript() const
78 return isHTMLLink() && toHTMLLinkElement(m_node).isEnabledViaScript();
81 bool StyleSheetCandidate::isEnabledAndLoading() const
83 return isHTMLLink() && !toHTMLLinkElement(m_node).isDisabled() && toHTMLLinkElement(m_node).styleSheetIsLoading();
86 bool StyleSheetCandidate::hasPreferrableName(const String& currentPreferrableName) const
88 ASSERT(isEnabledAndLoading() || sheet());
89 return !isEnabledViaScript() && !title().isEmpty() && !isAlternate() && currentPreferrableName.isEmpty();
92 bool StyleSheetCandidate::canBeActivated(const String& currentPreferrableName) const
94 StyleSheet* sheet = this->sheet();
95 if (!sheet || sheet->disabled() || !sheet->isCSSStyleSheet())
97 const AtomicString& title = this->title();
98 if (!isEnabledViaScript() && !title.isEmpty() && title != currentPreferrableName)
100 if (isAlternate() && title.isEmpty())
106 StyleSheetCandidate::Type StyleSheetCandidate::typeOf(Node& node)
108 if (node.nodeType() == Node::PROCESSING_INSTRUCTION_NODE)
111 if (node.isHTMLElement()) {
112 if (node.hasTagName(linkTag))
114 if (node.hasTagName(styleTag))
117 ASSERT_NOT_REACHED();
121 if (node.isSVGElement() && node.hasTagName(SVGNames::styleTag))
124 ASSERT_NOT_REACHED();
128 StyleSheet* StyleSheetCandidate::sheet() const
132 return toHTMLLinkElement(m_node).sheet();
134 return toHTMLStyleElement(m_node).sheet();
136 return toSVGStyleElement(m_node).sheet();
138 return toProcessingInstruction(m_node).sheet();
141 ASSERT_NOT_REACHED();