1 /*
2 * Copyright (C) 2006, 2007 Rob Buis
3 * Copyright (C) 2008 Apple, Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #include "config.h"
22 #include "core/dom/StyleElement.h"
23
24 #include "core/css/MediaList.h"
25 #include "core/css/MediaQueryEvaluator.h"
26 #include "core/css/StyleSheetContents.h"
27 #include "core/dom/Document.h"
28 #include "core/dom/Element.h"
29 #include "core/dom/ScriptableDocumentParser.h"
30 #include "core/dom/StyleEngine.h"
31 #include "core/html/HTMLStyleElement.h"
32 #include "core/frame/ContentSecurityPolicy.h"
33 #include "wtf/text/StringBuilder.h"
34
35 namespace WebCore {
36
isCSS(Element * element,const AtomicString & type)37 static bool isCSS(Element* element, const AtomicString& type)
38 {
39 return type.isEmpty() || (element->isHTMLElement() ? equalIgnoringCase(type, "text/css") : (type == "text/css"));
40 }
41
StyleElement(Document * document,bool createdByParser)42 StyleElement::StyleElement(Document* document, bool createdByParser)
43 : m_createdByParser(createdByParser)
44 , m_loading(false)
45 , m_startPosition(TextPosition::belowRangePosition())
46 {
47 if (createdByParser && document && document->scriptableDocumentParser() && !document->isInDocumentWrite())
48 m_startPosition = document->scriptableDocumentParser()->textPosition();
49 }
50
~StyleElement()51 StyleElement::~StyleElement()
52 {
53 if (m_sheet)
54 clearSheet();
55 }
56
processStyleSheet(Document & document,Element * element)57 void StyleElement::processStyleSheet(Document& document, Element* element)
58 {
59 ASSERT(element);
60 document.styleEngine()->addStyleSheetCandidateNode(element, m_createdByParser);
61 if (m_createdByParser)
62 return;
63
64 process(element);
65 }
66
removedFromDocument(Document & document,Element * element,ContainerNode * scopingNode)67 void StyleElement::removedFromDocument(Document& document, Element* element, ContainerNode* scopingNode)
68 {
69 ASSERT(element);
70 document.styleEngine()->removeStyleSheetCandidateNode(element, scopingNode);
71
72 RefPtr<StyleSheet> removedSheet = m_sheet;
73
74 if (m_sheet)
75 clearSheet();
76
77 document.removedStyleSheet(removedSheet.get(), RecalcStyleDeferred, AnalyzedStyleUpdate);
78 }
79
clearDocumentData(Document & document,Element * element)80 void StyleElement::clearDocumentData(Document& document, Element* element)
81 {
82 if (m_sheet)
83 m_sheet->clearOwnerNode();
84
85 if (element->inDocument())
86 document.styleEngine()->removeStyleSheetCandidateNode(element, isHTMLStyleElement(element) ? toHTMLStyleElement(element)->scopingNode() : 0);
87 }
88
childrenChanged(Element * element)89 void StyleElement::childrenChanged(Element* element)
90 {
91 ASSERT(element);
92 if (m_createdByParser)
93 return;
94
95 process(element);
96 }
97
finishParsingChildren(Element * element)98 void StyleElement::finishParsingChildren(Element* element)
99 {
100 ASSERT(element);
101 process(element);
102 m_createdByParser = false;
103 }
104
process(Element * element)105 void StyleElement::process(Element* element)
106 {
107 if (!element || !element->inDocument())
108 return;
109 createSheet(element, element->textFromChildren());
110 }
111
clearSheet()112 void StyleElement::clearSheet()
113 {
114 ASSERT(m_sheet);
115 m_sheet.release()->clearOwnerNode();
116 }
117
createSheet(Element * e,const String & text)118 void StyleElement::createSheet(Element* e, const String& text)
119 {
120 ASSERT(e);
121 ASSERT(e->inDocument());
122 Document& document = e->document();
123 if (m_sheet) {
124 if (m_sheet->isLoading())
125 document.styleEngine()->removePendingSheet(e);
126 clearSheet();
127 }
128
129 // If type is empty or CSS, this is a CSS style sheet.
130 const AtomicString& type = this->type();
131 bool passesContentSecurityPolicyChecks = document.contentSecurityPolicy()->allowStyleNonce(e->fastGetAttribute(HTMLNames::nonceAttr)) || document.contentSecurityPolicy()->allowInlineStyle(e->document().url(), m_startPosition.m_line);
132 if (isCSS(e, type) && passesContentSecurityPolicyChecks) {
133 RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media());
134
135 MediaQueryEvaluator screenEval("screen", true);
136 MediaQueryEvaluator printEval("print", true);
137 if (screenEval.eval(mediaQueries.get()) || printEval.eval(mediaQueries.get())) {
138 document.styleEngine()->addPendingSheet();
139 m_loading = true;
140
141 TextPosition startPosition = m_startPosition == TextPosition::belowRangePosition() ? TextPosition::minimumPosition() : m_startPosition;
142 m_sheet = CSSStyleSheet::createInline(e, KURL(), startPosition, document.inputEncoding());
143 m_sheet->setMediaQueries(mediaQueries.release());
144 m_sheet->setTitle(e->title());
145 m_sheet->contents()->parseStringAtPosition(text, startPosition, m_createdByParser);
146
147 m_loading = false;
148 }
149 }
150
151 if (m_sheet)
152 m_sheet->contents()->checkLoaded();
153 }
154
isLoading() const155 bool StyleElement::isLoading() const
156 {
157 if (m_loading)
158 return true;
159 return m_sheet ? m_sheet->isLoading() : false;
160 }
161
sheetLoaded(Document & document)162 bool StyleElement::sheetLoaded(Document& document)
163 {
164 if (isLoading())
165 return false;
166
167 document.styleEngine()->removePendingSheet(m_sheet->ownerNode());
168 return true;
169 }
170
startLoadingDynamicSheet(Document & document)171 void StyleElement::startLoadingDynamicSheet(Document& document)
172 {
173 document.styleEngine()->addPendingSheet();
174 }
175
176 }
177