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      1 /*
      2  * This file is part of the XSL implementation.
      3  *
      4  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 #include "XSLImportRule.h"
     24 
     25 #if ENABLE(XSLT)
     26 
     27 #include "CachedXSLStyleSheet.h"
     28 #include "DocLoader.h"
     29 #include "XSLStyleSheet.h"
     30 
     31 namespace WebCore {
     32 
     33 XSLImportRule::XSLImportRule(XSLStyleSheet* parent, const String& href)
     34     : StyleBase(parent)
     35     , m_strHref(href)
     36     , m_cachedSheet(0)
     37     , m_loading(false)
     38 {
     39 }
     40 
     41 XSLImportRule::~XSLImportRule()
     42 {
     43     if (m_styleSheet)
     44         m_styleSheet->setParent(0);
     45 
     46     if (m_cachedSheet)
     47         m_cachedSheet->removeClient(this);
     48 }
     49 
     50 XSLStyleSheet* XSLImportRule::parentStyleSheet() const
     51 {
     52     return (parent() && parent()->isXSLStyleSheet()) ? static_cast<XSLStyleSheet*>(parent()) : 0;
     53 }
     54 
     55 void XSLImportRule::setXSLStyleSheet(const String& href, const KURL& baseURL, const String& sheet)
     56 {
     57     if (m_styleSheet)
     58         m_styleSheet->setParent(0);
     59 
     60     m_styleSheet = XSLStyleSheet::create(this, href, baseURL);
     61 
     62     XSLStyleSheet* parent = parentStyleSheet();
     63     if (parent)
     64         m_styleSheet->setParentStyleSheet(parent);
     65 
     66     m_styleSheet->parseString(sheet);
     67     m_loading = false;
     68 
     69     if (parent)
     70         parent->checkLoaded();
     71 }
     72 
     73 bool XSLImportRule::isLoading()
     74 {
     75     return (m_loading || (m_styleSheet && m_styleSheet->isLoading()));
     76 }
     77 
     78 void XSLImportRule::loadSheet()
     79 {
     80     DocLoader* docLoader = 0;
     81     StyleBase* root = this;
     82     StyleBase* parent;
     83     while ((parent = root->parent()))
     84         root = parent;
     85     if (root->isXSLStyleSheet())
     86         docLoader = static_cast<XSLStyleSheet*>(root)->docLoader();
     87 
     88     String absHref = m_strHref;
     89     XSLStyleSheet* parentSheet = parentStyleSheet();
     90     if (!parentSheet->finalURL().isNull())
     91         // use parent styleheet's URL as the base URL
     92         absHref = KURL(parentSheet->finalURL(), m_strHref).string();
     93 
     94     // Check for a cycle in our import chain.  If we encounter a stylesheet
     95     // in our parent chain with the same URL, then just bail.
     96     for (parent = this->parent(); parent; parent = parent->parent()) {
     97         if (parent->isXSLStyleSheet() && absHref == static_cast<XSLStyleSheet*>(parent)->finalURL().string())
     98             return;
     99     }
    100 
    101     m_cachedSheet = docLoader->requestXSLStyleSheet(absHref);
    102 
    103     if (m_cachedSheet) {
    104         m_cachedSheet->addClient(this);
    105 
    106         // If the imported sheet is in the cache, then setXSLStyleSheet gets called,
    107         // and the sheet even gets parsed (via parseString).  In this case we have
    108         // loaded (even if our subresources haven't), so if we have a stylesheet after
    109         // checking the cache, then we've clearly loaded.
    110         if (!m_styleSheet)
    111             m_loading = true;
    112     }
    113 }
    114 
    115 } // namespace WebCore
    116 
    117 #endif // ENABLE(XSLT)
    118