329 lines
10 KiB
C++
329 lines
10 KiB
C++
/*
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* This file is part of the XSL implementation.
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*
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* Copyright (C) 2004, 2005, 2006, 2008, 2012 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#if ENABLE(XSLT)
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#include "CachedResourceLoader.h"
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#include "Document.h"
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#include "Frame.h"
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#include "Page.h"
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#include "PageConsoleClient.h"
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#include "TransformSource.h"
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#include "XMLDocumentParser.h"
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#include "XMLDocumentParserScope.h"
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#include "XSLImportRule.h"
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#include "XSLTProcessor.h"
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#include <libxml/uri.h>
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#include <libxslt/xsltutils.h>
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#include <wtf/CheckedArithmetic.h>
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#include <wtf/HexNumber.h>
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#include <wtf/unicode/CharacterNames.h>
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#if OS(DARWIN) && !PLATFORM(GTK)
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#include "SoftLinkLibxslt.h"
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#endif
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namespace WebCore {
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XSLStyleSheet::XSLStyleSheet(XSLImportRule* parentRule, const String& originalURL, const URL& finalURL)
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: m_ownerNode(nullptr)
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, m_originalURL(originalURL)
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, m_finalURL(finalURL)
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, m_embedded(false)
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, m_processed(false) // Child sheets get marked as processed when the libxslt engine has finally seen them.
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{
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if (parentRule)
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m_parentStyleSheet = parentRule->parentStyleSheet();
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}
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XSLStyleSheet::XSLStyleSheet(Node* parentNode, const String& originalURL, const URL& finalURL, bool embedded)
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: m_ownerNode(parentNode)
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, m_originalURL(originalURL)
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, m_finalURL(finalURL)
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, m_embedded(embedded)
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, m_processed(true) // The root sheet starts off processed.
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{
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}
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XSLStyleSheet::~XSLStyleSheet()
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{
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clearXSLStylesheetDocument();
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for (auto& import : m_children) {
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ASSERT(import->parentStyleSheet() == this);
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import->setParentStyleSheet(nullptr);
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}
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}
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bool XSLStyleSheet::isLoading() const
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{
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for (auto& import : m_children) {
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if (import->isLoading())
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return true;
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}
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return false;
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}
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void XSLStyleSheet::checkLoaded()
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{
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if (isLoading())
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return;
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if (XSLStyleSheet* styleSheet = parentStyleSheet())
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styleSheet->checkLoaded();
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if (ownerNode())
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ownerNode()->sheetLoaded();
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}
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xmlDocPtr XSLStyleSheet::document()
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{
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if (m_embedded && ownerDocument() && ownerDocument()->transformSource())
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return ownerDocument()->transformSource()->platformSource();
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return m_stylesheetDoc;
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}
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void XSLStyleSheet::clearDocuments()
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{
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clearXSLStylesheetDocument();
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for (auto& import : m_children) {
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if (import->styleSheet())
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import->styleSheet()->clearDocuments();
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}
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}
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void XSLStyleSheet::clearXSLStylesheetDocument()
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{
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if (!m_stylesheetDocTaken) {
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if (m_stylesheetDoc)
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xmlFreeDoc(m_stylesheetDoc);
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} else
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m_stylesheetDocTaken = false;
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m_stylesheetDoc = nullptr;
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}
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CachedResourceLoader* XSLStyleSheet::cachedResourceLoader()
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{
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Document* document = ownerDocument();
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if (!document)
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return nullptr;
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return &document->cachedResourceLoader();
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}
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bool XSLStyleSheet::parseString(const String& string)
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{
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// Parse in a single chunk into an xmlDocPtr
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const unsigned char BOMHighByte = *reinterpret_cast<const unsigned char*>(&byteOrderMark);
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clearXSLStylesheetDocument();
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PageConsoleClient* console = nullptr;
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Frame* frame = ownerDocument()->frame();
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if (frame && frame->page())
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console = &frame->page()->console();
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XMLDocumentParserScope scope(cachedResourceLoader(), XSLTProcessor::genericErrorFunc, XSLTProcessor::parseErrorFunc, console);
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auto upconvertedCharacters = StringView(string).upconvertedCharacters();
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const char* buffer = reinterpret_cast<const char*>(upconvertedCharacters.get());
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CheckedUint32 unsignedSize = string.length();
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unsignedSize *= sizeof(UChar);
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if (unsignedSize.hasOverflowed() || unsignedSize > static_cast<unsigned>(std::numeric_limits<int>::max()))
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return false;
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int size = unsignedSize.value<int>();
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xmlParserCtxtPtr ctxt = xmlCreateMemoryParserCtxt(buffer, size);
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if (!ctxt)
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return false;
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if (m_parentStyleSheet && m_parentStyleSheet->m_stylesheetDoc) {
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// The XSL transform may leave the newly-transformed document
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// with references to the symbol dictionaries of the style sheet
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// and any of its children. XML document disposal can corrupt memory
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// if a document uses more than one symbol dictionary, so we
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// ensure that all child stylesheets use the same dictionaries as their
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// parents.
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xmlDictFree(ctxt->dict);
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ctxt->dict = m_parentStyleSheet->m_stylesheetDoc->dict;
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xmlDictReference(ctxt->dict);
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}
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m_stylesheetDoc = xmlCtxtReadMemory(ctxt, buffer, size,
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finalURL().string().utf8().data(),
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BOMHighByte == 0xFF ? "UTF-16LE" : "UTF-16BE",
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XML_PARSE_NOENT | XML_PARSE_DTDATTR | XML_PARSE_NOWARNING | XML_PARSE_NOCDATA);
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xmlFreeParserCtxt(ctxt);
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loadChildSheets();
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return !!m_stylesheetDoc;
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}
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void XSLStyleSheet::loadChildSheets()
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{
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if (!document())
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return;
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xmlNodePtr stylesheetRoot = document()->children;
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// Top level children may include other things such as DTD nodes, we ignore those.
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while (stylesheetRoot && stylesheetRoot->type != XML_ELEMENT_NODE)
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stylesheetRoot = stylesheetRoot->next;
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if (m_embedded) {
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// We have to locate (by ID) the appropriate embedded stylesheet element, so that we can walk the
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// import/include list.
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xmlAttrPtr idNode = xmlGetID(document(), (const xmlChar*)(finalURL().string().utf8().data()));
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if (!idNode)
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return;
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stylesheetRoot = idNode->parent;
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} else {
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// FIXME: Need to handle an external URI with a # in it. This is a pretty minor edge case, so we'll deal
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// with it later.
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}
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if (stylesheetRoot) {
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// Walk the children of the root element and look for import/include elements.
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// Imports must occur first.
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xmlNodePtr curr = stylesheetRoot->children;
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while (curr) {
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if (curr->type != XML_ELEMENT_NODE) {
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curr = curr->next;
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continue;
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}
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if (IS_XSLT_ELEM(curr) && IS_XSLT_NAME(curr, "import")) {
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xmlChar* uriRef = xsltGetNsProp(curr, (const xmlChar*)"href", XSLT_NAMESPACE);
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loadChildSheet(String::fromUTF8((const char*)uriRef));
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xmlFree(uriRef);
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} else
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break;
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curr = curr->next;
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}
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// Now handle includes.
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while (curr) {
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if (curr->type == XML_ELEMENT_NODE && IS_XSLT_ELEM(curr) && IS_XSLT_NAME(curr, "include")) {
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xmlChar* uriRef = xsltGetNsProp(curr, (const xmlChar*)"href", XSLT_NAMESPACE);
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loadChildSheet(String::fromUTF8((const char*)uriRef));
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xmlFree(uriRef);
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}
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curr = curr->next;
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}
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}
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}
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void XSLStyleSheet::loadChildSheet(const String& href)
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{
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auto childRule = makeUnique<XSLImportRule>(this, href);
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m_children.append(childRule.release());
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m_children.last()->loadSheet();
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}
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xsltStylesheetPtr XSLStyleSheet::compileStyleSheet()
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{
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// FIXME: Hook up error reporting for the stylesheet compilation process.
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if (m_embedded)
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return xsltLoadStylesheetPI(document());
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// Certain libxslt versions are corrupting the xmlDoc on compilation
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// failures - hence attempting to recompile after a failure is unsafe.
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if (m_compilationFailed)
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return nullptr;
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// xsltParseStylesheetDoc makes the document part of the stylesheet
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// so we have to release our pointer to it.
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ASSERT(m_stylesheetDoc);
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ASSERT(!m_stylesheetDocTaken);
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xsltStylesheetPtr result = xsltParseStylesheetDoc(m_stylesheetDoc);
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if (result)
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m_stylesheetDocTaken = true;
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else
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m_compilationFailed = true;
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return result;
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}
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void XSLStyleSheet::setParentStyleSheet(XSLStyleSheet* parent)
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{
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m_parentStyleSheet = parent;
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}
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Document* XSLStyleSheet::ownerDocument()
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{
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for (XSLStyleSheet* styleSheet = this; styleSheet; styleSheet = styleSheet->parentStyleSheet()) {
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Node* node = styleSheet->ownerNode();
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if (node)
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return &node->document();
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}
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return 0;
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}
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xmlDocPtr XSLStyleSheet::locateStylesheetSubResource(xmlDocPtr parentDoc, const xmlChar* uri)
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{
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bool matchedParent = (parentDoc == document());
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for (auto& import : m_children) {
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XSLStyleSheet* child = import->styleSheet();
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if (!child)
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continue;
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if (matchedParent) {
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if (child->processed())
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continue; // libxslt has been given this sheet already.
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// Check the URI of the child stylesheet against the doc URI.
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// In order to ensure that libxml canonicalized both URLs, we get the original href
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// string from the import rule and canonicalize it using libxml before comparing it
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// with the URI argument.
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CString importHref = import->href().utf8();
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xmlChar* base = xmlNodeGetBase(parentDoc, (xmlNodePtr)parentDoc);
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xmlChar* childURI = xmlBuildURI((const xmlChar*)importHref.data(), base);
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bool equalURIs = xmlStrEqual(uri, childURI);
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xmlFree(base);
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xmlFree(childURI);
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if (equalURIs) {
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child->markAsProcessed();
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return child->document();
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}
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continue;
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}
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xmlDocPtr result = import->styleSheet()->locateStylesheetSubResource(parentDoc, uri);
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if (result)
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return result;
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}
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return 0;
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}
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void XSLStyleSheet::markAsProcessed()
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{
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ASSERT(!m_processed);
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ASSERT(!m_stylesheetDocTaken);
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m_processed = true;
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m_stylesheetDocTaken = true;
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}
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String XSLStyleSheet::debugDescription() const
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{
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return makeString("XSLStyleSheet "_s, "0x"_s, hex(reinterpret_cast<uintptr_t>(this), Lowercase), ' ', href());
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}
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} // namespace WebCore
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#endif // ENABLE(XSLT)
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