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      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 "StyleElement.h"
     23 
     24 #include "Document.h"
     25 #include "Element.h"
     26 #include "MappedAttribute.h"
     27 #include "MediaList.h"
     28 #include "MediaQueryEvaluator.h"
     29 
     30 namespace WebCore {
     31 
     32 StyleElement::StyleElement()
     33 {
     34 }
     35 
     36 StyleSheet* StyleElement::sheet(Element* e)
     37 {
     38     if (!m_sheet)
     39         createSheet(e);
     40     return m_sheet.get();
     41 }
     42 
     43 void StyleElement::insertedIntoDocument(Document*, Element* element)
     44 {
     45     process(element);
     46 }
     47 
     48 void StyleElement::removedFromDocument(Document* document)
     49 {
     50     // If we're in document teardown, then we don't need to do any notification of our sheet's removal.
     51     if (!document->renderer())
     52         return;
     53 
     54     // FIXME: It's terrible to do a synchronous update of the style selector just because a <style> or <link> element got removed.
     55     if (m_sheet)
     56         document->updateStyleSelector();
     57 }
     58 
     59 void StyleElement::process(Element* e)
     60 {
     61     if (!e || !e->inDocument())
     62         return;
     63 
     64     unsigned resultLength = 0;
     65     for (Node* c = e->firstChild(); c; c = c->nextSibling()) {
     66         Node::NodeType nodeType = c->nodeType();
     67         if (nodeType == Node::TEXT_NODE || nodeType == Node::CDATA_SECTION_NODE || nodeType == Node::COMMENT_NODE) {
     68             unsigned length = c->nodeValue().length();
     69             if (length > std::numeric_limits<unsigned>::max() - resultLength)
     70                 CRASH();
     71             resultLength += length;
     72         }
     73     }
     74     UChar* text;
     75     String sheetText = String::createUninitialized(resultLength, text);
     76 
     77     UChar* p = text;
     78     for (Node* c = e->firstChild(); c; c = c->nextSibling()) {
     79         Node::NodeType nodeType = c->nodeType();
     80         if (nodeType == Node::TEXT_NODE || nodeType == Node::CDATA_SECTION_NODE || nodeType == Node::COMMENT_NODE) {
     81             String nodeValue = c->nodeValue();
     82             unsigned nodeLength = nodeValue.length();
     83             memcpy(p, nodeValue.characters(), nodeLength * sizeof(UChar));
     84             p += nodeLength;
     85         }
     86     }
     87     ASSERT(p == text + resultLength);
     88 
     89     createSheet(e, sheetText);
     90 }
     91 
     92 void StyleElement::createSheet(Element* e, const String& text)
     93 {
     94     Document* document = e->document();
     95     if (m_sheet) {
     96         if (static_cast<CSSStyleSheet*>(m_sheet.get())->isLoading())
     97             document->removePendingSheet();
     98         m_sheet = 0;
     99     }
    100 
    101     // If type is empty or CSS, this is a CSS style sheet.
    102     const AtomicString& type = this->type();
    103     if (type.isEmpty() || (e->isHTMLElement() ? equalIgnoringCase(type, "text/css") : (type == "text/css"))) {
    104         RefPtr<MediaList> mediaList = MediaList::create(media(), e->isHTMLElement());
    105         MediaQueryEvaluator screenEval("screen", true);
    106         MediaQueryEvaluator printEval("print", true);
    107         if (screenEval.eval(mediaList.get()) || printEval.eval(mediaList.get())) {
    108             document->addPendingSheet();
    109             setLoading(true);
    110             m_sheet = CSSStyleSheet::create(e, String(), KURL(), document->inputEncoding());
    111             m_sheet->parseString(text, !document->inCompatMode());
    112             m_sheet->setMedia(mediaList.get());
    113             m_sheet->setTitle(e->title());
    114             setLoading(false);
    115         }
    116     }
    117 
    118     if (m_sheet)
    119         m_sheet->checkLoaded();
    120 }
    121 
    122 }
    123