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/DocumentStyleSheetCollection.h" 29 #include "core/dom/Element.h" 30 #include "core/dom/ScriptableDocumentParser.h" 31 #include "core/html/HTMLStyleElement.h" 32 #include "core/page/ContentSecurityPolicy.h" 33 #include "wtf/text/StringBuilder.h" 34 #include "wtf/text/TextPosition.h" 35 36 namespace WebCore { 37 38 static bool isCSS(Element* element, const AtomicString& type) 39 { 40 return type.isEmpty() || (element->isHTMLElement() ? equalIgnoringCase(type, "text/css") : (type == "text/css")); 41 } 42 43 StyleElement::StyleElement(Document* document, bool createdByParser) 44 : m_createdByParser(createdByParser) 45 , m_loading(false) 46 , m_startPosition(TextPosition::belowRangePosition()) 47 { 48 if (createdByParser && document && document->scriptableDocumentParser() && !document->isInDocumentWrite()) 49 m_startPosition = document->scriptableDocumentParser()->textPosition(); 50 } 51 52 StyleElement::~StyleElement() 53 { 54 if (m_sheet) 55 clearSheet(); 56 } 57 58 void StyleElement::processStyleSheet(Document* document, Element* element) 59 { 60 ASSERT(document); 61 ASSERT(element); 62 document->styleSheetCollection()->addStyleSheetCandidateNode(element, m_createdByParser); 63 if (m_createdByParser) 64 return; 65 66 process(element); 67 } 68 69 void StyleElement::removedFromDocument(Document* document, Element* element, ContainerNode* scopingNode) 70 { 71 ASSERT(document); 72 ASSERT(element); 73 document->styleSheetCollection()->removeStyleSheetCandidateNode(element, scopingNode); 74 75 RefPtr<StyleSheet> removedSheet = m_sheet; 76 77 if (m_sheet) 78 clearSheet(); 79 80 // If we're in document teardown, then we don't need to do any notification of our sheet's removal. 81 if (document->renderer()) 82 document->removedStyleSheet(removedSheet.get()); 83 } 84 85 void StyleElement::clearDocumentData(Document* document, Element* element) 86 { 87 if (m_sheet) 88 m_sheet->clearOwnerNode(); 89 90 if (element->inDocument()) 91 document->styleSheetCollection()->removeStyleSheetCandidateNode(element, isHTMLStyleElement(element) ? toHTMLStyleElement(element)->scopingNode() : 0); 92 } 93 94 void StyleElement::childrenChanged(Element* element) 95 { 96 ASSERT(element); 97 if (m_createdByParser) 98 return; 99 100 process(element); 101 } 102 103 void StyleElement::finishParsingChildren(Element* element) 104 { 105 ASSERT(element); 106 process(element); 107 m_createdByParser = false; 108 } 109 110 void StyleElement::process(Element* element) 111 { 112 if (!element || !element->inDocument()) 113 return; 114 createSheet(element, element->textFromChildren()); 115 } 116 117 void StyleElement::clearSheet() 118 { 119 ASSERT(m_sheet); 120 m_sheet.release()->clearOwnerNode(); 121 } 122 123 void StyleElement::createSheet(Element* e, const String& text) 124 { 125 ASSERT(e); 126 ASSERT(e->inDocument()); 127 Document* document = e->document(); 128 if (m_sheet) { 129 if (m_sheet->isLoading()) 130 document->styleSheetCollection()->removePendingSheet(); 131 clearSheet(); 132 } 133 134 // If type is empty or CSS, this is a CSS style sheet. 135 const AtomicString& type = this->type(); 136 if (document->contentSecurityPolicy()->allowInlineStyle(e->document()->url(), m_startPosition.m_line) && isCSS(e, type)) { 137 RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media()); 138 139 MediaQueryEvaluator screenEval("screen", true); 140 MediaQueryEvaluator printEval("print", true); 141 if (screenEval.eval(mediaQueries.get()) || printEval.eval(mediaQueries.get())) { 142 document->styleSheetCollection()->addPendingSheet(); 143 m_loading = true; 144 145 TextPosition startPosition = m_startPosition == TextPosition::belowRangePosition() ? TextPosition::minimumPosition() : m_startPosition; 146 m_sheet = CSSStyleSheet::createInline(e, KURL(), startPosition, document->inputEncoding()); 147 m_sheet->setMediaQueries(mediaQueries.release()); 148 m_sheet->setTitle(e->title()); 149 m_sheet->contents()->parseStringAtPosition(text, startPosition, m_createdByParser); 150 151 m_loading = false; 152 } 153 } 154 155 if (m_sheet) 156 m_sheet->contents()->checkLoaded(); 157 } 158 159 bool StyleElement::isLoading() const 160 { 161 if (m_loading) 162 return true; 163 return m_sheet ? m_sheet->isLoading() : false; 164 } 165 166 bool StyleElement::sheetLoaded(Document* document) 167 { 168 ASSERT(document); 169 if (isLoading()) 170 return false; 171 172 document->styleSheetCollection()->removePendingSheet(); 173 return true; 174 } 175 176 void StyleElement::startLoadingDynamicSheet(Document* document) 177 { 178 ASSERT(document); 179 document->styleSheetCollection()->addPendingSheet(); 180 } 181 182 } 183
