1 /*
2 * Copyright (C) 2013 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/dom/StyleSheetCandidate.h"
29
30 #include "core/HTMLNames.h"
31 #include "core/dom/Element.h"
32 #include "core/dom/ProcessingInstruction.h"
33 #include "core/dom/StyleEngine.h"
34 #include "core/html/HTMLLinkElement.h"
35 #include "core/html/HTMLStyleElement.h"
36 #include "core/html/imports/HTMLImport.h"
37 #include "core/svg/SVGStyleElement.h"
38
39 namespace WebCore {
40
41 using namespace HTMLNames;
42
title() const43 AtomicString StyleSheetCandidate::title() const
44 {
45 return isElement() ? toElement(m_node).fastGetAttribute(titleAttr) : nullAtom;
46 }
47
isXSL() const48 bool StyleSheetCandidate::isXSL() const
49 {
50 return !m_node.document().isHTMLDocument() && m_type == Pi && toProcessingInstruction(m_node).isXSL();
51 }
52
isImport() const53 bool StyleSheetCandidate::isImport() const
54 {
55 return m_type == HTMLLink && toHTMLLinkElement(m_node).isImport();
56 }
57
importedDocument() const58 Document* StyleSheetCandidate::importedDocument() const
59 {
60 ASSERT(isImport());
61 return toHTMLLinkElement(m_node).import();
62 }
63
isAlternate() const64 bool StyleSheetCandidate::isAlternate() const
65 {
66 if (!isElement())
67 return false;
68 return toElement(m_node).getAttribute(relAttr).contains("alternate");
69 }
70
isEnabledViaScript() const71 bool StyleSheetCandidate::isEnabledViaScript() const
72 {
73 return isHTMLLink() && toHTMLLinkElement(m_node).isEnabledViaScript();
74 }
75
isEnabledAndLoading() const76 bool StyleSheetCandidate::isEnabledAndLoading() const
77 {
78 return isHTMLLink() && !toHTMLLinkElement(m_node).isDisabled() && toHTMLLinkElement(m_node).styleSheetIsLoading();
79 }
80
hasPreferrableName(const String & currentPreferrableName) const81 bool StyleSheetCandidate::hasPreferrableName(const String& currentPreferrableName) const
82 {
83 ASSERT(isEnabledAndLoading() || sheet());
84 return !isEnabledViaScript() && !title().isEmpty() && !isAlternate() && currentPreferrableName.isEmpty();
85 }
86
canBeActivated(const String & currentPreferrableName) const87 bool StyleSheetCandidate::canBeActivated(const String& currentPreferrableName) const
88 {
89 StyleSheet* sheet = this->sheet();
90 if (!sheet || sheet->disabled() || !sheet->isCSSStyleSheet())
91 return false;
92 const AtomicString& title = this->title();
93 if (!isEnabledViaScript() && !title.isEmpty() && title != currentPreferrableName)
94 return false;
95 if (isAlternate() && title.isEmpty())
96 return false;
97
98 return true;
99 }
100
typeOf(Node & node)101 StyleSheetCandidate::Type StyleSheetCandidate::typeOf(Node& node)
102 {
103 if (node.nodeType() == Node::PROCESSING_INSTRUCTION_NODE)
104 return Pi;
105
106 if (node.isHTMLElement()) {
107 if (isHTMLLinkElement(node))
108 return HTMLLink;
109 if (isHTMLStyleElement(node))
110 return HTMLStyle;
111
112 ASSERT_NOT_REACHED();
113 return HTMLStyle;
114 }
115
116 if (isSVGStyleElement(node))
117 return SVGStyle;
118
119 ASSERT_NOT_REACHED();
120 return HTMLStyle;
121 }
122
sheet() const123 StyleSheet* StyleSheetCandidate::sheet() const
124 {
125 switch (m_type) {
126 case HTMLLink:
127 return toHTMLLinkElement(m_node).sheet();
128 case HTMLStyle:
129 return toHTMLStyleElement(m_node).sheet();
130 case SVGStyle:
131 return toSVGStyleElement(m_node).sheet();
132 case Pi:
133 return toProcessingInstruction(m_node).sheet();
134 }
135
136 ASSERT_NOT_REACHED();
137 return 0;
138 }
139
140 }
141