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/**
* This file is part of the XSL implementation.
*
* Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "XSLStyleSheet.h"
#if ENABLE(XSLT)
#include "CString.h"
#include "DocLoader.h"
#include "Document.h"
#include "Node.h"
#include "XSLImportRule.h"
#include "loader.h"
#include "XMLTokenizer.h"
#include <libxml/uri.h>
#include <libxslt/xsltutils.h>
namespace WebCore {
#define IS_BLANK_NODE(n) \
(((n)->type == XML_TEXT_NODE) && (xsltIsBlank((n)->content)))
XSLStyleSheet::XSLStyleSheet(XSLImportRule* parentRule, const String& href)
: StyleSheet(parentRule, href)
, m_ownerDocument(0)
, m_stylesheetDoc(0)
, m_embedded(false)
, m_processed(false) // Child sheets get marked as processed when the libxslt engine has finally seen them.
, m_stylesheetDocTaken(false)
{
}
XSLStyleSheet::XSLStyleSheet(Node* parentNode, const String& href, bool embedded)
: StyleSheet(parentNode, href)
, m_ownerDocument(parentNode->document())
, m_stylesheetDoc(0)
, m_embedded(embedded)
, m_processed(true) // The root sheet starts off processed.
, m_stylesheetDocTaken(false)
{
}
XSLStyleSheet::~XSLStyleSheet()
{
if (!m_stylesheetDocTaken)
xmlFreeDoc(m_stylesheetDoc);
}
bool XSLStyleSheet::isLoading()
{
unsigned len = length();
for (unsigned i = 0; i < len; ++i) {
StyleBase* rule = item(i);
if (rule->isImportRule()) {
XSLImportRule* import = static_cast<XSLImportRule*>(rule);
if (import->isLoading())
return true;
}
}
return false;
}
void XSLStyleSheet::checkLoaded()
{
if (isLoading())
return;
if (parent())
parent()->checkLoaded();
if (m_parentNode)
m_parentNode->sheetLoaded();
}
xmlDocPtr XSLStyleSheet::document()
{
if (m_embedded && ownerDocument())
return (xmlDocPtr)ownerDocument()->transformSource();
return m_stylesheetDoc;
}
void XSLStyleSheet::clearDocuments()
{
m_stylesheetDoc = 0;
unsigned len = length();
for (unsigned i = 0; i < len; ++i) {
StyleBase* rule = item(i);
if (rule->isImportRule()) {
XSLImportRule* import = static_cast<XSLImportRule*>(rule);
if (import->styleSheet())
import->styleSheet()->clearDocuments();
}
}
}
DocLoader* XSLStyleSheet::docLoader()
{
if (!m_ownerDocument)
return 0;
return m_ownerDocument->docLoader();
}
bool XSLStyleSheet::parseString(const String& string, bool strict)
{
// Parse in a single chunk into an xmlDocPtr
const UChar BOM = 0xFEFF;
const unsigned char BOMHighByte = *reinterpret_cast<const unsigned char*>(&BOM);
setLoaderForLibXMLCallbacks(docLoader());
if (!m_stylesheetDocTaken)
xmlFreeDoc(m_stylesheetDoc);
m_stylesheetDocTaken = false;
m_stylesheetDoc = xmlReadMemory(reinterpret_cast<const char*>(string.characters()), string.length() * sizeof(UChar),
m_ownerDocument->URL().ascii(),
BOMHighByte == 0xFF ? "UTF-16LE" : "UTF-16BE",
XML_PARSE_NOENT | XML_PARSE_DTDATTR | XML_PARSE_NOERROR | XML_PARSE_NOWARNING | XML_PARSE_NOCDATA);
loadChildSheets();
setLoaderForLibXMLCallbacks(0);
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*)(href().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 (IS_BLANK_NODE(curr)) {
curr = curr->next;
continue;
}
if (curr->type == XML_ELEMENT_NODE && IS_XSLT_ELEM(curr) && IS_XSLT_NAME(curr, "import")) {
xmlChar* uriRef = xsltGetNsProp(curr, (const xmlChar*)"href", XSLT_NAMESPACE);
loadChildSheet(DeprecatedString::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(DeprecatedString::fromUtf8((const char*)uriRef));
xmlFree(uriRef);
}
curr = curr->next;
}
}
}
void XSLStyleSheet::loadChildSheet(const DeprecatedString& href)
{
RefPtr<XSLImportRule> childRule = new XSLImportRule(this, href);
append(childRule);
childRule->loadSheet();
}
xsltStylesheetPtr XSLStyleSheet::compileStyleSheet()
{
// FIXME: Hook up error reporting for the stylesheet compilation process.
if (m_embedded)
return xsltLoadStylesheetPI(document());
// 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;
return result;
}
xmlDocPtr XSLStyleSheet::locateStylesheetSubResource(xmlDocPtr parentDoc, const xmlChar* uri)
{
bool matchedParent = (parentDoc == document());
unsigned len = length();
for (unsigned i = 0; i < len; ++i) {
StyleBase* rule = item(i);
if (rule->isImportRule()) {
XSLImportRule* import = static_cast<XSLImportRule*>(rule);
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*)(const char*)importHref, base);
bool equalURIs = xmlStrEqual(uri, childURI);
xmlFree(base);
xmlFree(childURI);
if (equalURIs) {
child->markAsProcessed();
return child->document();
}
} else {
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;
}
} // namespace WebCore
#endif // ENABLE(XSLT)