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