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 "bindings/v8/ScriptController.h" 25 #include "core/css/MediaList.h" 26 #include "core/css/MediaQueryEvaluator.h" 27 #include "core/css/StyleSheetContents.h" 28 #include "core/dom/Document.h" 29 #include "core/dom/Element.h" 30 #include "core/dom/ScriptableDocumentParser.h" 31 #include "core/dom/StyleEngine.h" 32 #include "core/frame/LocalFrame.h" 33 #include "core/frame/csp/ContentSecurityPolicy.h" 34 #include "core/html/HTMLStyleElement.h" 35 #include "platform/TraceEvent.h" 36 #include "wtf/text/StringBuilder.h" 37 38 namespace WebCore { 39 40 static bool isCSS(Element* element, const AtomicString& type) 41 { 42 return type.isEmpty() || (element->isHTMLElement() ? equalIgnoringCase(type, "text/css") : (type == "text/css")); 43 } 44 45 StyleElement::StyleElement(Document* document, bool createdByParser) 46 : m_createdByParser(createdByParser) 47 , m_loading(false) 48 , m_registeredAsCandidate(false) 49 , m_startPosition(TextPosition::belowRangePosition()) 50 { 51 if (createdByParser && document && document->scriptableDocumentParser() && !document->isInDocumentWrite()) 52 m_startPosition = document->scriptableDocumentParser()->textPosition(); 53 } 54 55 StyleElement::~StyleElement() 56 { 57 #if !ENABLE(OILPAN) 58 if (m_sheet) 59 clearSheet(); 60 #endif 61 } 62 63 void StyleElement::processStyleSheet(Document& document, Element* element) 64 { 65 TRACE_EVENT0("webkit", "StyleElement::processStyleSheet"); 66 ASSERT(element); 67 ASSERT(element->inDocument()); 68 69 m_registeredAsCandidate = true; 70 document.styleEngine()->addStyleSheetCandidateNode(element, m_createdByParser); 71 if (m_createdByParser) 72 return; 73 74 process(element); 75 } 76 77 void StyleElement::removedFromDocument(Document& document, Element* element) 78 { 79 removedFromDocument(document, element, 0, document); 80 } 81 82 void StyleElement::removedFromDocument(Document& document, Element* element, ContainerNode* scopingNode, TreeScope& treeScope) 83 { 84 ASSERT(element); 85 86 if (m_registeredAsCandidate) { 87 document.styleEngine()->removeStyleSheetCandidateNode(element, scopingNode, treeScope); 88 m_registeredAsCandidate = false; 89 } 90 91 RefPtrWillBeRawPtr<StyleSheet> removedSheet = m_sheet.get(); 92 93 if (m_sheet) 94 clearSheet(element); 95 if (removedSheet) 96 document.removedStyleSheet(removedSheet.get(), AnalyzedStyleUpdate); 97 } 98 99 void StyleElement::clearDocumentData(Document& document, Element* element) 100 { 101 if (m_sheet) 102 m_sheet->clearOwnerNode(); 103 104 if (element->inDocument()) { 105 ContainerNode* scopingNode = isHTMLStyleElement(element) ? toHTMLStyleElement(element)->scopingNode() : 0; 106 TreeScope& treeScope = scopingNode ? scopingNode->treeScope() : element->treeScope(); 107 document.styleEngine()->removeStyleSheetCandidateNode(element, scopingNode, treeScope); 108 } 109 } 110 111 void StyleElement::childrenChanged(Element* element) 112 { 113 ASSERT(element); 114 if (m_createdByParser) 115 return; 116 117 process(element); 118 } 119 120 void StyleElement::finishParsingChildren(Element* element) 121 { 122 ASSERT(element); 123 process(element); 124 m_createdByParser = false; 125 } 126 127 void StyleElement::process(Element* element) 128 { 129 if (!element || !element->inDocument()) 130 return; 131 createSheet(element, element->textFromChildren()); 132 } 133 134 void StyleElement::clearSheet(Element* ownerElement) 135 { 136 ASSERT(m_sheet); 137 138 if (ownerElement && m_sheet->isLoading()) 139 ownerElement->document().styleEngine()->removePendingSheet(ownerElement); 140 141 m_sheet.release()->clearOwnerNode(); 142 } 143 144 void StyleElement::createSheet(Element* e, const String& text) 145 { 146 ASSERT(e); 147 ASSERT(e->inDocument()); 148 Document& document = e->document(); 149 if (m_sheet) 150 clearSheet(e); 151 152 // Inline style added from an isolated world should bypass the main world's 153 // CSP just as an inline script would. 154 LocalFrame* frame = document.frame(); 155 bool shouldBypassMainWorldContentSecurityPolicy = frame && frame->script().shouldBypassMainWorldContentSecurityPolicy(); 156 157 // If type is empty or CSS, this is a CSS style sheet. 158 const AtomicString& type = this->type(); 159 bool passesContentSecurityPolicyChecks = shouldBypassMainWorldContentSecurityPolicy || document.contentSecurityPolicy()->allowStyleHash(text) || document.contentSecurityPolicy()->allowStyleNonce(e->fastGetAttribute(HTMLNames::nonceAttr)) || document.contentSecurityPolicy()->allowInlineStyle(e->document().url(), m_startPosition.m_line); 160 if (isCSS(e, type) && passesContentSecurityPolicyChecks) { 161 RefPtrWillBeRawPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media()); 162 163 MediaQueryEvaluator screenEval("screen", true); 164 MediaQueryEvaluator printEval("print", true); 165 if (screenEval.eval(mediaQueries.get()) || printEval.eval(mediaQueries.get())) { 166 m_loading = true; 167 TextPosition startPosition = m_startPosition == TextPosition::belowRangePosition() ? TextPosition::minimumPosition() : m_startPosition; 168 m_sheet = document.styleEngine()->createSheet(e, text, startPosition, m_createdByParser); 169 m_sheet->setMediaQueries(mediaQueries.release()); 170 m_loading = false; 171 } 172 } 173 174 if (m_sheet) 175 m_sheet->contents()->checkLoaded(); 176 } 177 178 bool StyleElement::isLoading() const 179 { 180 if (m_loading) 181 return true; 182 return m_sheet ? m_sheet->isLoading() : false; 183 } 184 185 bool StyleElement::sheetLoaded(Document& document) 186 { 187 if (isLoading()) 188 return false; 189 190 document.styleEngine()->removePendingSheet(m_sheet->ownerNode()); 191 return true; 192 } 193 194 void StyleElement::startLoadingDynamicSheet(Document& document) 195 { 196 document.styleEngine()->addPendingSheet(); 197 } 198 199 void StyleElement::trace(Visitor* visitor) 200 { 201 visitor->trace(m_sheet); 202 } 203 204 } 205
