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      1 /*
      2  * This file is part of the XSL implementation.
      3  *
      4  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple, Inc. All rights reserved.
      5  * Copyright (C) 2005, 2006 Alexey Proskuryakov <ap (at) webkit.org>
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #include "config.h"
     24 
     25 #if ENABLE(XSLT)
     26 
     27 #include "XSLTProcessor.h"
     28 
     29 #include "DOMImplementation.h"
     30 #include "DocLoader.h"
     31 #include "DocumentFragment.h"
     32 #include "Frame.h"
     33 #include "FrameLoader.h"
     34 #include "FrameView.h"
     35 #include "HTMLDocument.h"
     36 #include "HTMLTokenizer.h" // for parseHTMLDocumentFragment
     37 #include "Page.h"
     38 #include "Text.h"
     39 #include "TextResourceDecoder.h"
     40 #include "XMLTokenizer.h"
     41 #include "loader.h"
     42 #include "markup.h"
     43 #include <wtf/Assertions.h>
     44 #include <wtf/Platform.h>
     45 #include <wtf/Vector.h>
     46 
     47 namespace WebCore {
     48 
     49 static inline void transformTextStringToXHTMLDocumentString(String& text)
     50 {
     51     // Modify the output so that it is a well-formed XHTML document with a <pre> tag enclosing the text.
     52     text.replace('&', "&amp;");
     53     text.replace('<', "&lt;");
     54     text = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
     55         "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
     56         "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n"
     57         "<head><title/></head>\n"
     58         "<body>\n"
     59         "<pre>" + text + "</pre>\n"
     60         "</body>\n"
     61         "</html>\n";
     62 }
     63 
     64 PassRefPtr<Document> XSLTProcessor::createDocumentFromSource(const String& sourceString,
     65     const String& sourceEncoding, const String& sourceMIMEType, Node* sourceNode, Frame* frame)
     66 {
     67     RefPtr<Document> ownerDocument = sourceNode->document();
     68     bool sourceIsDocument = (sourceNode == ownerDocument.get());
     69     String documentSource = sourceString;
     70 
     71     RefPtr<Document> result;
     72     if (sourceMIMEType == "text/plain") {
     73         result = ownerDocument->implementation()->createDocument(frame);
     74         transformTextStringToXHTMLDocumentString(documentSource);
     75     } else
     76         result = ownerDocument->implementation()->createDocument(sourceMIMEType, frame, false);
     77 
     78     // Before parsing, we need to save & detach the old document and get the new document
     79     // in place. We have to do this only if we're rendering the result document.
     80     if (frame) {
     81         if (FrameView* view = frame->view())
     82             view->clear();
     83         result->setTransformSourceDocument(frame->document());
     84         frame->setDocument(result);
     85     }
     86 
     87     if (sourceIsDocument)
     88         result->setURL(ownerDocument->url());
     89     result->open();
     90 
     91     RefPtr<TextResourceDecoder> decoder = TextResourceDecoder::create(sourceMIMEType);
     92     decoder->setEncoding(sourceEncoding.isEmpty() ? UTF8Encoding() : TextEncoding(sourceEncoding), TextResourceDecoder::EncodingFromXMLHeader);
     93     result->setDecoder(decoder.release());
     94 
     95     result->write(documentSource);
     96     result->finishParsing();
     97     result->close();
     98 
     99     return result.release();
    100 }
    101 
    102 static inline RefPtr<DocumentFragment> createFragmentFromSource(const String& sourceString, const String& sourceMIMEType, Document* outputDoc)
    103 {
    104     RefPtr<DocumentFragment> fragment = DocumentFragment::create(outputDoc);
    105 
    106     if (sourceMIMEType == "text/html")
    107         parseHTMLDocumentFragment(sourceString, fragment.get());
    108     else if (sourceMIMEType == "text/plain")
    109         fragment->addChild(Text::create(outputDoc, sourceString));
    110     else {
    111         bool successfulParse = parseXMLDocumentFragment(sourceString, fragment.get(), outputDoc->documentElement());
    112         if (!successfulParse)
    113             return 0;
    114     }
    115 
    116     // FIXME: Do we need to mess with URLs here?
    117 
    118     return fragment;
    119 }
    120 
    121 PassRefPtr<Document> XSLTProcessor::transformToDocument(Node* sourceNode)
    122 {
    123     String resultMIMEType;
    124     String resultString;
    125     String resultEncoding;
    126     if (!transformToString(sourceNode, resultMIMEType, resultString, resultEncoding))
    127         return 0;
    128     return createDocumentFromSource(resultString, resultEncoding, resultMIMEType, sourceNode, 0);
    129 }
    130 
    131 PassRefPtr<DocumentFragment> XSLTProcessor::transformToFragment(Node* sourceNode, Document* outputDoc)
    132 {
    133     String resultMIMEType;
    134     String resultString;
    135     String resultEncoding;
    136 
    137     // If the output document is HTML, default to HTML method.
    138     if (outputDoc->isHTMLDocument())
    139         resultMIMEType = "text/html";
    140 
    141     if (!transformToString(sourceNode, resultMIMEType, resultString, resultEncoding))
    142         return 0;
    143     return createFragmentFromSource(resultString, resultMIMEType, outputDoc);
    144 }
    145 
    146 void XSLTProcessor::setParameter(const String& /*namespaceURI*/, const String& localName, const String& value)
    147 {
    148     // FIXME: namespace support?
    149     // should make a QualifiedName here but we'd have to expose the impl
    150     m_parameters.set(localName, value);
    151 }
    152 
    153 String XSLTProcessor::getParameter(const String& /*namespaceURI*/, const String& localName) const
    154 {
    155     // FIXME: namespace support?
    156     // should make a QualifiedName here but we'd have to expose the impl
    157     return m_parameters.get(localName);
    158 }
    159 
    160 void XSLTProcessor::removeParameter(const String& /*namespaceURI*/, const String& localName)
    161 {
    162     // FIXME: namespace support?
    163     m_parameters.remove(localName);
    164 }
    165 
    166 void XSLTProcessor::reset()
    167 {
    168     m_stylesheet.clear();
    169     m_stylesheetRootNode.clear();
    170     m_parameters.clear();
    171 }
    172 
    173 } // namespace WebCore
    174 
    175 #endif // ENABLE(XSLT)
    176