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chromium / chromium / src / 56d5d7aa7ad96ad3c853cc128a769404f6e0294c / . / third_party / WebKit / Source / core / xml / parser / XMLDocumentParser.cpp
blob: 8745e6c8832ec6149ae20d702471158d549cb653 [file] [log] [blame]
/*
* Copyright (C) 2000 Peter Kelly (pmk@post.com)
* Copyright (C) 2005, 2006, 2008, 2014 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2008 Holger Hans Peter Freyther
* Copyright (C) 2008 Torch Mobile Inc. All rights reserved.
* (http://www.torchmobile.com/)
*
* 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 "core/xml/parser/XMLDocumentParser.h"
#include "bindings/core/v8/ExceptionState.h"
#include "bindings/core/v8/ExceptionStatePlaceholder.h"
#include "bindings/core/v8/ScriptController.h"
#include "bindings/core/v8/ScriptSourceCode.h"
#include "bindings/core/v8/V8Document.h"
#include "core/HTMLNames.h"
#include "core/XMLNSNames.h"
#include "core/dom/CDATASection.h"
#include "core/dom/Comment.h"
#include "core/dom/Document.h"
#include "core/dom/DocumentFragment.h"
#include "core/dom/DocumentParserTiming.h"
#include "core/dom/DocumentType.h"
#include "core/dom/ProcessingInstruction.h"
#include "core/dom/ScriptLoader.h"
#include "core/dom/StyleEngine.h"
#include "core/dom/TransformSource.h"
#include "core/fetch/FetchInitiatorTypeNames.h"
#include "core/fetch/RawResource.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/fetch/ScriptResource.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/UseCounter.h"
#include "core/html/HTMLHtmlElement.h"
#include "core/html/HTMLTemplateElement.h"
#include "core/html/parser/HTMLEntityParser.h"
#include "core/html/parser/TextResourceDecoder.h"
#include "core/inspector/ConsoleMessage.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/ImageLoader.h"
#include "core/svg/graphics/SVGImage.h"
#include "core/xml/DocumentXSLT.h"
#include "core/xml/parser/SharedBufferReader.h"
#include "core/xml/parser/XMLDocumentParserScope.h"
#include "core/xml/parser/XMLParserInput.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/SharedBuffer.h"
#include "platform/TraceEvent.h"
#include "platform/network/ResourceError.h"
#include "platform/network/ResourceRequest.h"
#include "platform/network/ResourceResponse.h"
#include "platform/weborigin/SecurityOrigin.h"
#include "wtf/AutoReset.h"
#include "wtf/PtrUtil.h"
#include "wtf/StringExtras.h"
#include "wtf/Threading.h"
#include "wtf/Vector.h"
#include "wtf/text/UTF8.h"
#include <libxml/catalog.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxslt/xslt.h>
#include <memory>
namespace blink {
using namespace HTMLNames;
// FIXME: HTMLConstructionSite has a limit of 512, should these match?
static const unsigned maxXMLTreeDepth = 5000;
static inline String toString(const xmlChar* string, size_t length) {
return String::fromUTF8(reinterpret_cast<const char*>(string), length);
}
static inline String toString(const xmlChar* string) {
return String::fromUTF8(reinterpret_cast<const char*>(string));
}
static inline AtomicString toAtomicString(const xmlChar* string,
size_t length) {
return AtomicString::fromUTF8(reinterpret_cast<const char*>(string), length);
}
static inline AtomicString toAtomicString(const xmlChar* string) {
return AtomicString::fromUTF8(reinterpret_cast<const char*>(string));
}
static inline bool hasNoStyleInformation(Document* document) {
if (document->sawElementsInKnownNamespaces() ||
DocumentXSLT::hasTransformSourceDocument(*document))
return false;
if (!document->frame() || !document->frame()->page())
return false;
if (document->frame()->tree().parent())
return false; // This document is not in a top frame
if (SVGImage::isInSVGImage(document))
return false;
return true;
}
class PendingStartElementNSCallback final
: public XMLDocumentParser::PendingCallback {
public:
PendingStartElementNSCallback(const AtomicString& localName,
const AtomicString& prefix,
const AtomicString& uri,
int namespaceCount,
const xmlChar** namespaces,
int attributeCount,
int defaultedCount,
const xmlChar** attributes)
: m_localName(localName),
m_prefix(prefix),
m_uri(uri),
m_namespaceCount(namespaceCount),
m_attributeCount(attributeCount),
m_defaultedCount(defaultedCount) {
m_namespaces = static_cast<xmlChar**>(
xmlMalloc(sizeof(xmlChar*) * namespaceCount * 2));
for (int i = 0; i < namespaceCount * 2; ++i)
m_namespaces[i] = xmlStrdup(namespaces[i]);
m_attributes = static_cast<xmlChar**>(
xmlMalloc(sizeof(xmlChar*) * attributeCount * 5));
for (int i = 0; i < attributeCount; ++i) {
// Each attribute has 5 elements in the array:
// name, prefix, uri, value and an end pointer.
for (int j = 0; j < 3; ++j)
m_attributes[i * 5 + j] = xmlStrdup(attributes[i * 5 + j]);
int length = attributes[i * 5 + 4] - attributes[i * 5 + 3];
m_attributes[i * 5 + 3] = xmlStrndup(attributes[i * 5 + 3], length);
m_attributes[i * 5 + 4] = m_attributes[i * 5 + 3] + length;
}
}
~PendingStartElementNSCallback() override {
for (int i = 0; i < m_namespaceCount * 2; ++i)
xmlFree(m_namespaces[i]);
xmlFree(m_namespaces);
for (int i = 0; i < m_attributeCount; ++i)
for (int j = 0; j < 4; ++j)
xmlFree(m_attributes[i * 5 + j]);
xmlFree(m_attributes);
}
void call(XMLDocumentParser* parser) override {
parser->startElementNs(m_localName, m_prefix, m_uri, m_namespaceCount,
const_cast<const xmlChar**>(m_namespaces),
m_attributeCount, m_defaultedCount,
const_cast<const xmlChar**>(m_attributes));
}
private:
AtomicString m_localName;
AtomicString m_prefix;
AtomicString m_uri;
int m_namespaceCount;
xmlChar** m_namespaces;
int m_attributeCount;
int m_defaultedCount;
xmlChar** m_attributes;
};
class PendingEndElementNSCallback final
: public XMLDocumentParser::PendingCallback {
public:
explicit PendingEndElementNSCallback(TextPosition scriptStartPosition)
: m_scriptStartPosition(scriptStartPosition) {}
void call(XMLDocumentParser* parser) override {
parser->setScriptStartPosition(m_scriptStartPosition);
parser->endElementNs();
}
private:
TextPosition m_scriptStartPosition;
};
class PendingCharactersCallback final
: public XMLDocumentParser::PendingCallback {
public:
PendingCharactersCallback(const xmlChar* chars, int length)
: m_chars(xmlStrndup(chars, length)), m_length(length) {}
~PendingCharactersCallback() override { xmlFree(m_chars); }
void call(XMLDocumentParser* parser) override {
parser->characters(m_chars, m_length);
}
private:
xmlChar* m_chars;
int m_length;
};
class PendingProcessingInstructionCallback final
: public XMLDocumentParser::PendingCallback {
public:
PendingProcessingInstructionCallback(const String& target, const String& data)
: m_target(target), m_data(data) {}
void call(XMLDocumentParser* parser) override {
parser->processingInstruction(m_target, m_data);
}
private:
String m_target;
String m_data;
};
class PendingCDATABlockCallback final
: public XMLDocumentParser::PendingCallback {
public:
explicit PendingCDATABlockCallback(const String& text) : m_text(text) {}
void call(XMLDocumentParser* parser) override { parser->cdataBlock(m_text); }
private:
String m_text;
};
class PendingCommentCallback final : public XMLDocumentParser::PendingCallback {
public:
explicit PendingCommentCallback(const String& text) : m_text(text) {}
void call(XMLDocumentParser* parser) override { parser->comment(m_text); }
private:
String m_text;
};
class PendingInternalSubsetCallback final
: public XMLDocumentParser::PendingCallback {
public:
PendingInternalSubsetCallback(const String& name,
const String& externalID,
const String& systemID)
: m_name(name), m_externalID(externalID), m_systemID(systemID) {}
void call(XMLDocumentParser* parser) override {
parser->internalSubset(m_name, m_externalID, m_systemID);
}
private:
String m_name;
String m_externalID;
String m_systemID;
};
class PendingErrorCallback final : public XMLDocumentParser::PendingCallback {
public:
PendingErrorCallback(XMLErrors::ErrorType type,
const xmlChar* message,
OrdinalNumber lineNumber,
OrdinalNumber columnNumber)
: m_type(type),
m_message(xmlStrdup(message)),
m_lineNumber(lineNumber),
m_columnNumber(columnNumber) {}
~PendingErrorCallback() override { xmlFree(m_message); }
void call(XMLDocumentParser* parser) override {
parser->handleError(m_type, reinterpret_cast<char*>(m_message),
TextPosition(m_lineNumber, m_columnNumber));
}
private:
XMLErrors::ErrorType m_type;
xmlChar* m_message;
OrdinalNumber m_lineNumber;
OrdinalNumber m_columnNumber;
};
void XMLDocumentParser::pushCurrentNode(ContainerNode* n) {
DCHECK(n);
DCHECK(m_currentNode);
m_currentNodeStack.append(m_currentNode);
m_currentNode = n;
if (m_currentNodeStack.size() > maxXMLTreeDepth)
handleError(XMLErrors::ErrorTypeFatal, "Excessive node nesting.",
textPosition());
}
void XMLDocumentParser::popCurrentNode() {
if (!m_currentNode)
return;
DCHECK(m_currentNodeStack.size());
m_currentNode = m_currentNodeStack.last();
m_currentNodeStack.removeLast();
}
void XMLDocumentParser::clearCurrentNodeStack() {
m_currentNode = nullptr;
m_leafTextNode = nullptr;
if (m_currentNodeStack.size()) { // Aborted parsing.
m_currentNodeStack.clear();
}
}
void XMLDocumentParser::insert(const SegmentedString&) {
NOTREACHED();
}
void XMLDocumentParser::append(const String& inputSource) {
const SegmentedString source(inputSource);
if (m_sawXSLTransform || !m_sawFirstElement)
m_originalSourceForTransform.append(source);
if (isStopped() || m_sawXSLTransform)
return;
if (m_parserPaused) {
m_pendingSrc.append(source);
return;
}
doWrite(source.toString());
}
void XMLDocumentParser::handleError(XMLErrors::ErrorType type,
const char* formattedMessage,
TextPosition position) {
m_xmlErrors.handleError(type, formattedMessage, position);
if (type != XMLErrors::ErrorTypeWarning)
m_sawError = true;
if (type == XMLErrors::ErrorTypeFatal)
stopParsing();
}
void XMLDocumentParser::createLeafTextNodeIfNeeded() {
if (m_leafTextNode)
return;
DCHECK_EQ(m_bufferedText.size(), 0u);
m_leafTextNode = Text::create(m_currentNode->document(), "");
m_currentNode->parserAppendChild(m_leafTextNode.get());
}
bool XMLDocumentParser::updateLeafTextNode() {
if (isStopped())
return false;
if (!m_leafTextNode)
return true;
m_leafTextNode->appendData(
toString(m_bufferedText.data(), m_bufferedText.size()));
m_bufferedText.clear();
m_leafTextNode = nullptr;
// Mutation event handlers executed by appendData() might detach this parser.
return !isStopped();
}
void XMLDocumentParser::detach() {
if (m_pendingScript) {
m_pendingScript->removeClient(this);
m_pendingScript = nullptr;
m_parserBlockingPendingScriptLoadStartTime = 0.0;
}
clearCurrentNodeStack();
ScriptableDocumentParser::detach();
}
void XMLDocumentParser::end() {
TRACE_EVENT0("blink", "XMLDocumentParser::end");
// XMLDocumentParserLibxml2 will do bad things to the document if doEnd() is
// called. I don't believe XMLDocumentParserQt needs doEnd called in the
// fragment case.
DCHECK(!m_parsingFragment);
doEnd();
// doEnd() call above can detach the parser and null out its document.
// In that case, we just bail out.
if (isDetached())
return;
// doEnd() could process a script tag, thus pausing parsing.
if (m_parserPaused)
return;
if (m_sawError)
insertErrorMessageBlock();
else
updateLeafTextNode();
if (isParsing())
prepareToStopParsing();
document()->setReadyState(Document::Interactive);
clearCurrentNodeStack();
document()->finishedParsing();
}
void XMLDocumentParser::finish() {
// FIXME: We should DCHECK(!m_parserStopped) here, since it does not
// makes sense to call any methods on DocumentParser once it's been stopped.
// However, FrameLoader::stop calls DocumentParser::finish unconditionally.
flush();
if (isDetached())
return;
if (m_parserPaused)
m_finishCalled = true;
else
end();
}
void XMLDocumentParser::insertErrorMessageBlock() {
m_xmlErrors.insertErrorMessageBlock();
}
void XMLDocumentParser::notifyFinished(Resource* unusedResource) {
DCHECK_EQ(unusedResource, m_pendingScript);
ScriptSourceCode sourceCode(m_pendingScript.get());
bool errorOccurred = m_pendingScript->errorOccurred();
bool wasCanceled = m_pendingScript->wasCanceled();
double scriptParserBlockingTime = m_parserBlockingPendingScriptLoadStartTime;
m_parserBlockingPendingScriptLoadStartTime = 0.0;
m_pendingScript->removeClient(this);
m_pendingScript = nullptr;
Element* e = m_scriptElement;
m_scriptElement = nullptr;
ScriptLoader* scriptLoader = toScriptLoaderIfPossible(e);
DCHECK(scriptLoader);
if (errorOccurred) {
scriptLoader->dispatchErrorEvent();
} else if (!wasCanceled) {
if (scriptParserBlockingTime > 0.0) {
DocumentParserTiming::from(*document())
.recordParserBlockedOnScriptLoadDuration(
monotonicallyIncreasingTime() - scriptParserBlockingTime,
scriptLoader->wasCreatedDuringDocumentWrite());
}
if (!scriptLoader->executeScript(sourceCode))
scriptLoader->dispatchErrorEvent();
else
scriptLoader->dispatchLoadEvent();
}
m_scriptElement = nullptr;
if (!isDetached() && !m_requestingScript)
resumeParsing();
}
bool XMLDocumentParser::isWaitingForScripts() const {
return m_pendingScript;
}
void XMLDocumentParser::pauseParsing() {
if (!m_parsingFragment)
m_parserPaused = true;
}
bool XMLDocumentParser::parseDocumentFragment(
const String& chunk,
DocumentFragment* fragment,
Element* contextElement,
ParserContentPolicy parserContentPolicy) {
if (!chunk.length())
return true;
// FIXME: We need to implement the HTML5 XML Fragment parsing algorithm:
// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-xhtml-syntax.html#xml-fragment-parsing-algorithm
// For now we have a hack for script/style innerHTML support:
if (contextElement && (contextElement->hasLocalName(scriptTag.localName()) ||
contextElement->hasLocalName(styleTag.localName()))) {
fragment->parserAppendChild(fragment->document().createTextNode(chunk));
return true;
}
XMLDocumentParser* parser =
XMLDocumentParser::create(fragment, contextElement, parserContentPolicy);
bool wellFormed = parser->appendFragmentSource(chunk);
// Do not call finish(). Current finish() and doEnd() implementations touch
// the main Document/loader and can cause crashes in the fragment case.
// Allows ~DocumentParser to assert it was detached before destruction.
parser->detach();
// appendFragmentSource()'s wellFormed is more permissive than wellFormed().
return wellFormed;
}
static int globalDescriptor = 0;
static ThreadIdentifier libxmlLoaderThread = 0;
static int matchFunc(const char*) {
// Only match loads initiated due to uses of libxml2 from within
// XMLDocumentParser to avoid interfering with client applications that also
// use libxml2. http://bugs.webkit.org/show_bug.cgi?id=17353
return XMLDocumentParserScope::currentDocument &&
currentThread() == libxmlLoaderThread;
}
static inline void setAttributes(Element* element,
Vector<Attribute>& attributeVector,
ParserContentPolicy parserContentPolicy) {
if (!scriptingContentIsAllowed(parserContentPolicy))
element->stripScriptingAttributes(attributeVector);
element->parserSetAttributes(attributeVector);
}
static void switchEncoding(xmlParserCtxtPtr ctxt, bool is8Bit) {
// Make sure we don't call xmlSwitchEncoding in an error state.
if ((ctxt->errNo != XML_ERR_OK) && (ctxt->disableSAX == 1))
return;
// Hack around libxml2's lack of encoding overide support by manually
// resetting the encoding to UTF-16 before every chunk. Otherwise libxml
// will detect <?xml version="1.0" encoding="<encoding name>"?> blocks and
// switch encodings, causing the parse to fail.
if (is8Bit) {
xmlSwitchEncoding(ctxt, XML_CHAR_ENCODING_8859_1);
return;
}
const UChar BOM = 0xFEFF;
const unsigned char BOMHighByte =
*reinterpret_cast<const unsigned char*>(&BOM);
xmlSwitchEncoding(ctxt, BOMHighByte == 0xFF ? XML_CHAR_ENCODING_UTF16LE
: XML_CHAR_ENCODING_UTF16BE);
}
static void parseChunk(xmlParserCtxtPtr ctxt, const String& chunk) {
bool is8Bit = chunk.is8Bit();
switchEncoding(ctxt, is8Bit);
if (is8Bit)
xmlParseChunk(ctxt, reinterpret_cast<const char*>(chunk.characters8()),
sizeof(LChar) * chunk.length(), 0);
else
xmlParseChunk(ctxt, reinterpret_cast<const char*>(chunk.characters16()),
sizeof(UChar) * chunk.length(), 0);
}
static void finishParsing(xmlParserCtxtPtr ctxt) {
xmlParseChunk(ctxt, 0, 0, 1);
}
#define xmlParseChunk \
#error "Use parseChunk instead to select the correct encoding."
static bool isLibxmlDefaultCatalogFile(const String& urlString) {
// On non-Windows platforms libxml asks for this URL, the
// "XML_XML_DEFAULT_CATALOG", on initialization.
if (urlString == "file:///etc/xml/catalog")
return true;
// On Windows, libxml computes a URL relative to where its DLL resides.
if (urlString.startsWith("file:///", TextCaseInsensitive) &&
urlString.endsWith("/etc/catalog", TextCaseInsensitive))
return true;
return false;
}
static bool shouldAllowExternalLoad(const KURL& url) {
String urlString = url.getString();
// This isn't really necessary now that initializeLibXMLIfNecessary
// disables catalog support in libxml, but keeping it for defense in depth.
if (isLibxmlDefaultCatalogFile(url))
return false;
// The most common DTD. There isn't much point in hammering www.w3c.org by
// requesting this URL for every XHTML document.
if (urlString.startsWith("http://www.w3.org/TR/xhtml", TextCaseInsensitive))
return false;
// Similarly, there isn't much point in requesting the SVG DTD.
if (urlString.startsWith("http://www.w3.org/Graphics/SVG",
TextCaseInsensitive))
return false;
// The libxml doesn't give us a lot of context for deciding whether to allow
// this request. In the worst case, this load could be for an external
// entity and the resulting document could simply read the retrieved
// content. If we had more context, we could potentially allow the parser to
// load a DTD. As things stand, we take the conservative route and allow
// same-origin requests only.
if (!XMLDocumentParserScope::currentDocument->getSecurityOrigin()->canRequest(
url)) {
// FIXME: This is copy/pasted. We should probably build console logging into
// canRequest().
if (!url.isNull()) {
String message =
"Unsafe attempt to load URL " + url.elidedString() +
" from frame with URL " +
XMLDocumentParserScope::currentDocument->url().elidedString() +
". Domains, protocols and ports must match.\n";
XMLDocumentParserScope::currentDocument->addConsoleMessage(
ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel,
message));
}
return false;
}
return true;
}
static void* openFunc(const char* uri) {
DCHECK(XMLDocumentParserScope::currentDocument);
DCHECK_EQ(currentThread(), libxmlLoaderThread);
KURL url(KURL(), uri);
if (!shouldAllowExternalLoad(url))
return &globalDescriptor;
KURL finalURL;
RefPtr<const SharedBuffer> data;
{
Document* document = XMLDocumentParserScope::currentDocument;
XMLDocumentParserScope scope(0);
// FIXME: We should restore the original global error handler as well.
FetchRequest request(ResourceRequest(url), FetchInitiatorTypeNames::xml,
ResourceFetcher::defaultResourceOptions());
Resource* resource =
RawResource::fetchSynchronously(request, document->fetcher());
if (resource && !resource->errorOccurred()) {
data = resource->resourceBuffer();
finalURL = resource->response().url();
}
}
// We have to check the URL again after the load to catch redirects.
// See <https://bugs.webkit.org/show_bug.cgi?id=21963>.
if (!shouldAllowExternalLoad(finalURL))
return &globalDescriptor;
UseCounter::count(XMLDocumentParserScope::currentDocument,
UseCounter::XMLExternalResourceLoad);
return new SharedBufferReader(data);
}
static int readFunc(void* context, char* buffer, int len) {
// Do 0-byte reads in case of a null descriptor
if (context == &globalDescriptor)
return 0;
SharedBufferReader* data = static_cast<SharedBufferReader*>(context);
return data->readData(buffer, len);
}
static int writeFunc(void*, const char*, int) {
// Always just do 0-byte writes
return 0;
}
static int closeFunc(void* context) {
if (context != &globalDescriptor) {
SharedBufferReader* data = static_cast<SharedBufferReader*>(context);
delete data;
}
return 0;
}
static void errorFunc(void*, const char*, ...) {
// FIXME: It would be nice to display error messages somewhere.
}
static void initializeLibXMLIfNecessary() {
static bool didInit = false;
if (didInit)
return;
// We don't want libxml to try and load catalogs.
// FIXME: It's not nice to set global settings in libxml, embedders of Blink
// could be trying to use libxml themselves.
xmlCatalogSetDefaults(XML_CATA_ALLOW_NONE);
xmlInitParser();
xmlRegisterInputCallbacks(matchFunc, openFunc, readFunc, closeFunc);
xmlRegisterOutputCallbacks(matchFunc, openFunc, writeFunc, closeFunc);
libxmlLoaderThread = currentThread();
didInit = true;
}
PassRefPtr<XMLParserContext> XMLParserContext::createStringParser(
xmlSAXHandlerPtr handlers,
void* userData) {
initializeLibXMLIfNecessary();
xmlParserCtxtPtr parser = xmlCreatePushParserCtxt(handlers, 0, 0, 0, 0);
xmlCtxtUseOptions(parser, XML_PARSE_HUGE);
parser->_private = userData;
parser->replaceEntities = true;
return adoptRef(new XMLParserContext(parser));
}
// Chunk should be encoded in UTF-8
PassRefPtr<XMLParserContext> XMLParserContext::createMemoryParser(
xmlSAXHandlerPtr handlers,
void* userData,
const CString& chunk) {
initializeLibXMLIfNecessary();
// appendFragmentSource() checks that the length doesn't overflow an int.
xmlParserCtxtPtr parser =
xmlCreateMemoryParserCtxt(chunk.data(), chunk.length());
if (!parser)
return nullptr;
// Copy the sax handler
memcpy(parser->sax, handlers, sizeof(xmlSAXHandler));
// Set parser options.
// XML_PARSE_NODICT: default dictionary option.
// XML_PARSE_NOENT: force entities substitutions.
// XML_PARSE_HUGE: don't impose arbitrary limits on document size.
xmlCtxtUseOptions(parser,
XML_PARSE_NODICT | XML_PARSE_NOENT | XML_PARSE_HUGE);
// Internal initialization
parser->sax2 = 1;
parser->instate = XML_PARSER_CONTENT; // We are parsing a CONTENT
parser->depth = 0;
parser->str_xml = xmlDictLookup(parser->dict, BAD_CAST "xml", 3);
parser->str_xmlns = xmlDictLookup(parser->dict, BAD_CAST "xmlns", 5);
parser->str_xml_ns = xmlDictLookup(parser->dict, XML_XML_NAMESPACE, 36);
parser->_private = userData;
return adoptRef(new XMLParserContext(parser));
}
// --------------------------------
bool XMLDocumentParser::supportsXMLVersion(const String& version) {
return version == "1.0";
}
XMLDocumentParser::XMLDocumentParser(Document& document, FrameView* frameView)
: ScriptableDocumentParser(document),
m_hasView(frameView),
m_context(nullptr),
m_currentNode(&document),
m_isCurrentlyParsing8BitChunk(false),
m_sawError(false),
m_sawCSS(false),
m_sawXSLTransform(false),
m_sawFirstElement(false),
m_isXHTMLDocument(false),
m_parserPaused(false),
m_requestingScript(false),
m_finishCalled(false),
m_xmlErrors(&document),
m_scriptStartPosition(TextPosition::belowRangePosition()),
m_parserBlockingPendingScriptLoadStartTime(0.0),
m_parsingFragment(false) {
// This is XML being used as a document resource.
if (frameView && document.isXMLDocument())
UseCounter::count(document, UseCounter::XMLDocument);
}
XMLDocumentParser::XMLDocumentParser(DocumentFragment* fragment,
Element* parentElement,
ParserContentPolicy parserContentPolicy)
: ScriptableDocumentParser(fragment->document(), parserContentPolicy),
m_hasView(false),
m_context(nullptr),
m_currentNode(fragment),
m_isCurrentlyParsing8BitChunk(false),
m_sawError(false),
m_sawCSS(false),
m_sawXSLTransform(false),
m_sawFirstElement(false),
m_isXHTMLDocument(false),
m_parserPaused(false),
m_requestingScript(false),
m_finishCalled(false),
m_xmlErrors(&fragment->document()),
m_scriptStartPosition(TextPosition::belowRangePosition()),
m_parsingFragment(true) {
// Add namespaces based on the parent node
HeapVector<Member<Element>> elemStack;
while (parentElement) {
elemStack.append(parentElement);
Element* grandParentElement = parentElement->parentElement();
if (!grandParentElement)
break;
parentElement = grandParentElement;
}
if (elemStack.isEmpty())
return;
for (; !elemStack.isEmpty(); elemStack.removeLast()) {
Element* element = elemStack.last();
AttributeCollection attributes = element->attributes();
for (auto& attribute : attributes) {
if (attribute.localName() == xmlnsAtom)
m_defaultNamespaceURI = attribute.value();
else if (attribute.prefix() == xmlnsAtom)
m_prefixToNamespaceMap.set(attribute.localName(), attribute.value());
}
}
// If the parent element is not in document tree, there may be no xmlns
// attribute; just default to the parent's namespace.
if (m_defaultNamespaceURI.isNull() && !parentElement->isConnected())
m_defaultNamespaceURI = parentElement->namespaceURI();
}
XMLParserContext::~XMLParserContext() {
if (m_context->myDoc)
xmlFreeDoc(m_context->myDoc);
xmlFreeParserCtxt(m_context);
}
XMLDocumentParser::~XMLDocumentParser() {
DCHECK(!m_pendingScript);
}
DEFINE_TRACE(XMLDocumentParser) {
visitor->trace(m_currentNode);
visitor->trace(m_currentNodeStack);
visitor->trace(m_leafTextNode);
visitor->trace(m_xmlErrors);
visitor->trace(m_pendingScript);
visitor->trace(m_scriptElement);
ScriptableDocumentParser::trace(visitor);
ScriptResourceClient::trace(visitor);
}
void XMLDocumentParser::doWrite(const String& parseString) {
TRACE_EVENT0("blink", "XMLDocumentParser::doWrite");
DCHECK(!isDetached());
if (!m_context)
initializeParserContext();
// Protect the libxml context from deletion during a callback
RefPtr<XMLParserContext> context = m_context;
// libXML throws an error if you try to switch the encoding for an empty
// string.
if (parseString.length()) {
XMLDocumentParserScope scope(document());
AutoReset<bool> encodingScope(&m_isCurrentlyParsing8BitChunk,
parseString.is8Bit());
parseChunk(context->context(), parseString);
// JavaScript (which may be run under the parseChunk callstack) may
// cause the parser to be stopped or detached.
if (isStopped())
return;
}
// FIXME: Why is this here? And why is it after we process the passed
// source?
if (document()->sawDecodingError()) {
// If the decoder saw an error, report it as fatal (stops parsing)
TextPosition position(
OrdinalNumber::fromOneBasedInt(context->context()->input->line),
OrdinalNumber::fromOneBasedInt(context->context()->input->col));
handleError(XMLErrors::ErrorTypeFatal, "Encoding error", position);
}
}
struct xmlSAX2Namespace {
const xmlChar* prefix;
const xmlChar* uri;
};
static inline void handleNamespaceAttributes(
Vector<Attribute>& prefixedAttributes,
const xmlChar** libxmlNamespaces,
int nbNamespaces,
ExceptionState& exceptionState) {
xmlSAX2Namespace* namespaces =
reinterpret_cast<xmlSAX2Namespace*>(libxmlNamespaces);
for (int i = 0; i < nbNamespaces; ++i) {
AtomicString namespaceQName = xmlnsAtom;
AtomicString namespaceURI = toAtomicString(namespaces[i].uri);
if (namespaces[i].prefix)
namespaceQName =
WTF::xmlnsWithColon + toAtomicString(namespaces[i].prefix);
QualifiedName parsedName = anyName;
if (!Element::parseAttributeName(parsedName, XMLNSNames::xmlnsNamespaceURI,
namespaceQName, exceptionState))
return;
prefixedAttributes.append(Attribute(parsedName, namespaceURI));
}
}
struct xmlSAX2Attributes {
const xmlChar* localname;
const xmlChar* prefix;
const xmlChar* uri;
const xmlChar* value;
const xmlChar* end;
};
static inline void handleElementAttributes(
Vector<Attribute>& prefixedAttributes,
const xmlChar** libxmlAttributes,
int nbAttributes,
const HashMap<AtomicString, AtomicString>& initialPrefixToNamespaceMap,
ExceptionState& exceptionState) {
xmlSAX2Attributes* attributes =
reinterpret_cast<xmlSAX2Attributes*>(libxmlAttributes);
for (int i = 0; i < nbAttributes; ++i) {
int valueLength = static_cast<int>(attributes[i].end - attributes[i].value);
AtomicString attrValue = toAtomicString(attributes[i].value, valueLength);
AtomicString attrPrefix = toAtomicString(attributes[i].prefix);
AtomicString attrURI;
if (!attrPrefix.isEmpty()) {
// If provided, use the namespace URI from libxml2 because libxml2
// updates its namespace table as it parses whereas the
// initialPrefixToNamespaceMap is the initial map from namespace
// prefixes to namespace URIs created by the XMLDocumentParser
// constructor (in the case where we are parsing an XML fragment).
if (attributes[i].uri) {
attrURI = toAtomicString(attributes[i].uri);
} else {
const HashMap<AtomicString, AtomicString>::const_iterator it =
initialPrefixToNamespaceMap.find(attrPrefix);
if (it != initialPrefixToNamespaceMap.end())
attrURI = it->value;
else
attrURI = AtomicString();
}
}
AtomicString attrQName =
attrPrefix.isEmpty()
? toAtomicString(attributes[i].localname)
: attrPrefix + ":" + toString(attributes[i].localname);
QualifiedName parsedName = anyName;
if (!Element::parseAttributeName(parsedName, attrURI, attrQName,
exceptionState))
return;
prefixedAttributes.append(Attribute(parsedName, attrValue));
}
}
void XMLDocumentParser::startElementNs(const AtomicString& localName,
const AtomicString& prefix,
const AtomicString& uri,
int nbNamespaces,
const xmlChar** libxmlNamespaces,
int nbAttributes,
int nbDefaulted,
const xmlChar** libxmlAttributes) {
if (isStopped())
return;
if (m_parserPaused) {
m_scriptStartPosition = textPosition();
m_pendingCallbacks.append(wrapUnique(new PendingStartElementNSCallback(
localName, prefix, uri, nbNamespaces, libxmlNamespaces, nbAttributes,
nbDefaulted, libxmlAttributes)));
return;
}
if (!updateLeafTextNode())
return;
AtomicString adjustedURI = uri;
if (m_parsingFragment && adjustedURI.isNull()) {
if (!prefix.isNull())
adjustedURI = m_prefixToNamespaceMap.get(prefix);
else
adjustedURI = m_defaultNamespaceURI;
}
bool isFirstElement = !m_sawFirstElement;
m_sawFirstElement = true;
QualifiedName qName(prefix, localName, adjustedURI);
Element* newElement =
m_currentNode->document().createElement(qName, CreatedByParser);
if (!newElement) {
stopParsing();
return;
}
Vector<Attribute> prefixedAttributes;
TrackExceptionState exceptionState;
handleNamespaceAttributes(prefixedAttributes, libxmlNamespaces, nbNamespaces,
exceptionState);
if (exceptionState.hadException()) {
setAttributes(newElement, prefixedAttributes, getParserContentPolicy());
stopParsing();
return;
}
handleElementAttributes(prefixedAttributes, libxmlAttributes, nbAttributes,
m_prefixToNamespaceMap, exceptionState);
setAttributes(newElement, prefixedAttributes, getParserContentPolicy());
if (exceptionState.hadException()) {
stopParsing();
return;
}
newElement->beginParsingChildren();
ScriptLoader* scriptLoader = toScriptLoaderIfPossible(newElement);
if (scriptLoader)
m_scriptStartPosition = textPosition();
m_currentNode->parserAppendChild(newElement);
// Event handlers may synchronously trigger removal of the
// document and cancellation of this parser.
if (isStopped()) {
stopParsing();
return;
}
if (isHTMLTemplateElement(*newElement))
pushCurrentNode(toHTMLTemplateElement(*newElement).content());
else
pushCurrentNode(newElement);
// Note: |insertedByParser| will perform dispatching if this is an
// HTMLHtmlElement.
if (isHTMLHtmlElement(*newElement) && isFirstElement) {
toHTMLHtmlElement(*newElement).insertedByParser();
} else if (!m_parsingFragment && isFirstElement && document()->frame()) {
document()->frame()->loader().dispatchDocumentElementAvailable();
document()->frame()->loader().runScriptsAtDocumentElementAvailable();
// runScriptsAtDocumentElementAvailable might have invalidated the document.
}
}
void XMLDocumentParser::endElementNs() {
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks.append(
wrapUnique(new PendingEndElementNSCallback(m_scriptStartPosition)));
return;
}
if (!updateLeafTextNode())
return;
ContainerNode* n = m_currentNode;
if (m_currentNode->isElementNode())
toElement(n)->finishParsingChildren();
if (!scriptingContentIsAllowed(getParserContentPolicy()) &&
n->isElementNode() && toScriptLoaderIfPossible(toElement(n))) {
popCurrentNode();
n->remove(IGNORE_EXCEPTION);
return;
}
if (!n->isElementNode() || !m_hasView) {
popCurrentNode();
return;
}
Element* element = toElement(n);
// The element's parent may have already been removed from document.
// Parsing continues in this case, but scripts aren't executed.
if (!element->isConnected()) {
popCurrentNode();
return;
}
ScriptLoader* scriptLoader = toScriptLoaderIfPossible(element);
if (!scriptLoader) {
popCurrentNode();
return;
}
// Don't load external scripts for standalone documents (for now).
DCHECK(!m_pendingScript);
m_requestingScript = true;
if (scriptLoader->prepareScript(
m_scriptStartPosition,
ScriptLoader::AllowLegacyTypeInTypeAttribute)) {
// FIXME: Script execution should be shared between
// the libxml2 and Qt XMLDocumentParser implementations.
if (scriptLoader->readyToBeParserExecuted()) {
if (!scriptLoader->executeScript(
ScriptSourceCode(scriptLoader->scriptContent(), document()->url(),
m_scriptStartPosition))) {
scriptLoader->dispatchErrorEvent();
return;
}
} else if (scriptLoader->willBeParserExecuted()) {
m_pendingScript = scriptLoader->resource();
DCHECK_EQ(m_parserBlockingPendingScriptLoadStartTime, 0.0);
m_parserBlockingPendingScriptLoadStartTime =
monotonicallyIncreasingTime();
m_scriptElement = element;
m_pendingScript->addClient(this);
// m_pendingScript will be 0 if script was already loaded and
// addClient() executed it.
if (m_pendingScript)
pauseParsing();
} else {
m_scriptElement = nullptr;
}
// JavaScript may have detached the parser
if (isDetached())
return;
}
m_requestingScript = false;
popCurrentNode();
}
void XMLDocumentParser::setScriptStartPosition(TextPosition textPosition) {
m_scriptStartPosition = textPosition;
}
void XMLDocumentParser::characters(const xmlChar* chars, int length) {
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks.append(
wrapUnique(new PendingCharactersCallback(chars, length)));
return;
}
createLeafTextNodeIfNeeded();
m_bufferedText.append(chars, length);
}
void XMLDocumentParser::error(XMLErrors::ErrorType type,
const char* message,
va_list args) {
if (isStopped())
return;
char formattedMessage[1024];
vsnprintf(formattedMessage, sizeof(formattedMessage) - 1, message, args);
if (m_parserPaused) {
m_pendingCallbacks.append(wrapUnique(new PendingErrorCallback(
type, reinterpret_cast<const xmlChar*>(formattedMessage), lineNumber(),
columnNumber())));
return;
}
handleError(type, formattedMessage, textPosition());
}
void XMLDocumentParser::processingInstruction(const String& target,
const String& data) {
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks.append(
wrapUnique(new PendingProcessingInstructionCallback(target, data)));
return;
}
if (!updateLeafTextNode())
return;
// ### handle exceptions
TrackExceptionState exceptionState;
ProcessingInstruction* pi =
m_currentNode->document().createProcessingInstruction(target, data,
exceptionState);
if (exceptionState.hadException())
return;
m_currentNode->parserAppendChild(pi);
if (pi->isCSS())
m_sawCSS = true;
if (!RuntimeEnabledFeatures::xsltEnabled())
return;
m_sawXSLTransform = !m_sawFirstElement && pi->isXSL();
if (m_sawXSLTransform &&
!DocumentXSLT::hasTransformSourceDocument(*document())) {
// This behavior is very tricky. We call stopParsing() here because we
// want to stop processing the document until we're ready to apply the
// transform, but we actually still want to be fed decoded string pieces
// to accumulate in m_originalSourceForTransform. So, we call
// stopParsing() here and check isStopped() in element callbacks.
// FIXME: This contradicts the contract of DocumentParser.
stopParsing();
}
}
void XMLDocumentParser::cdataBlock(const String& text) {
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks.append(wrapUnique(new PendingCDATABlockCallback(text)));
return;
}
if (!updateLeafTextNode())
return;
m_currentNode->parserAppendChild(
CDATASection::create(m_currentNode->document(), text));
}
void XMLDocumentParser::comment(const String& text) {
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks.append(wrapUnique(new PendingCommentCallback(text)));
return;
}
if (!updateLeafTextNode())
return;
m_currentNode->parserAppendChild(
Comment::create(m_currentNode->document(), text));
}
enum StandaloneInfo {
StandaloneUnspecified = -2,
NoXMlDeclaration,
StandaloneNo,
StandaloneYes
};
void XMLDocumentParser::startDocument(const String& version,
const String& encoding,
int standalone) {
StandaloneInfo standaloneInfo = static_cast<StandaloneInfo>(standalone);
if (standaloneInfo == NoXMlDeclaration) {
document()->setHasXMLDeclaration(false);
return;
}
if (!version.isNull())
document()->setXMLVersion(version, ASSERT_NO_EXCEPTION);
if (standalone != StandaloneUnspecified)
document()->setXMLStandalone(standaloneInfo == StandaloneYes,
ASSERT_NO_EXCEPTION);
if (!encoding.isNull())
document()->setXMLEncoding(encoding);
document()->setHasXMLDeclaration(true);
}
void XMLDocumentParser::endDocument() {
updateLeafTextNode();
}
void XMLDocumentParser::internalSubset(const String& name,
const String& externalID,
const String& systemID) {
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks.append(wrapUnique(
new PendingInternalSubsetCallback(name, externalID, systemID)));
return;
}
if (document())
document()->parserAppendChild(
DocumentType::create(document(), name, externalID, systemID));
}
static inline XMLDocumentParser* getParser(void* closure) {
xmlParserCtxtPtr ctxt = static_cast<xmlParserCtxtPtr>(closure);
return static_cast<XMLDocumentParser*>(ctxt->_private);
}
static void startElementNsHandler(void* closure,
const xmlChar* localName,
const xmlChar* prefix,
const xmlChar* uri,
int nbNamespaces,
const xmlChar** namespaces,
int nbAttributes,
int nbDefaulted,
const xmlChar** libxmlAttributes) {
getParser(closure)->startElementNs(
toAtomicString(localName), toAtomicString(prefix), toAtomicString(uri),
nbNamespaces, namespaces, nbAttributes, nbDefaulted, libxmlAttributes);
}
static void endElementNsHandler(void* closure,
const xmlChar*,
const xmlChar*,
const xmlChar*) {
getParser(closure)->endElementNs();
}
static void charactersHandler(void* closure, const xmlChar* chars, int length) {
getParser(closure)->characters(chars, length);
}
static void processingInstructionHandler(void* closure,
const xmlChar* target,
const xmlChar* data) {
getParser(closure)->processingInstruction(toString(target), toString(data));
}
static void cdataBlockHandler(void* closure, const xmlChar* text, int length) {
getParser(closure)->cdataBlock(toString(text, length));
}
static void commentHandler(void* closure, const xmlChar* text) {
getParser(closure)->comment(toString(text));
}
WTF_ATTRIBUTE_PRINTF(2, 3)
static void warningHandler(void* closure, const char* message, ...) {
va_list args;
va_start(args, message);
getParser(closure)->error(XMLErrors::ErrorTypeWarning, message, args);
va_end(args);
}
WTF_ATTRIBUTE_PRINTF(2, 3)
static void normalErrorHandler(void* closure, const char* message, ...) {
va_list args;
va_start(args, message);
getParser(closure)->error(XMLErrors::ErrorTypeNonFatal, message, args);
va_end(args);
}
// Using a static entity and marking it XML_INTERNAL_PREDEFINED_ENTITY is a hack
// to avoid malloc/free. Using a global variable like this could cause trouble
// if libxml implementation details were to change
static xmlChar sharedXHTMLEntityResult[9] = {0, 0, 0, 0, 0, 0, 0, 0, 0};
static xmlEntityPtr sharedXHTMLEntity() {
static xmlEntity entity;
if (!entity.type) {
entity.type = XML_ENTITY_DECL;
entity.orig = sharedXHTMLEntityResult;
entity.content = sharedXHTMLEntityResult;
entity.etype = XML_INTERNAL_PREDEFINED_ENTITY;
}
return &entity;
}
static size_t convertUTF16EntityToUTF8(const UChar* utf16Entity,
size_t numberOfCodeUnits,
char* target,
size_t targetSize) {
const char* originalTarget = target;
WTF::Unicode::ConversionResult conversionResult =
WTF::Unicode::convertUTF16ToUTF8(&utf16Entity,
utf16Entity + numberOfCodeUnits, &target,
target + targetSize);
if (conversionResult != WTF::Unicode::conversionOK)
return 0;
// Even though we must pass the length, libxml expects the entity string to be
// null terminated.
DCHECK_GT(target, originalTarget + 1);
*target = '\0';
return target - originalTarget;
}
static xmlEntityPtr getXHTMLEntity(const xmlChar* name) {
UChar utf16DecodedEntity[4];
size_t numberOfCodeUnits = decodeNamedEntityToUCharArray(
reinterpret_cast<const char*>(name), utf16DecodedEntity);
if (!numberOfCodeUnits)
return 0;
DCHECK_LE(numberOfCodeUnits, 4u);
size_t entityLengthInUTF8 =
convertUTF16EntityToUTF8(utf16DecodedEntity, numberOfCodeUnits,
reinterpret_cast<char*>(sharedXHTMLEntityResult),
WTF_ARRAY_LENGTH(sharedXHTMLEntityResult));
if (!entityLengthInUTF8)
return 0;
xmlEntityPtr entity = sharedXHTMLEntity();
entity->length = entityLengthInUTF8;
entity->name = name;
return entity;
}
static xmlEntityPtr getEntityHandler(void* closure, const xmlChar* name) {
xmlParserCtxtPtr ctxt = static_cast<xmlParserCtxtPtr>(closure);
xmlEntityPtr ent = xmlGetPredefinedEntity(name);
if (ent) {
ent->etype = XML_INTERNAL_PREDEFINED_ENTITY;
return ent;
}
ent = xmlGetDocEntity(ctxt->myDoc, name);
if (!ent && getParser(closure)->isXHTMLDocument()) {
ent = getXHTMLEntity(name);
if (ent)
ent->etype = XML_INTERNAL_GENERAL_ENTITY;
}
return ent;
}
static void startDocumentHandler(void* closure) {
xmlParserCtxt* ctxt = static_cast<xmlParserCtxt*>(closure);
XMLDocumentParser* parser = getParser(closure);
switchEncoding(ctxt, parser->isCurrentlyParsing8BitChunk());
parser->startDocument(toString(ctxt->version), toString(ctxt->encoding),
ctxt->standalone);
xmlSAX2StartDocument(closure);
}
static void endDocumentHandler(void* closure) {
getParser(closure)->endDocument();
xmlSAX2EndDocument(closure);
}
static void internalSubsetHandler(void* closure,
const xmlChar* name,
const xmlChar* externalID,
const xmlChar* systemID) {
getParser(closure)->internalSubset(toString(name), toString(externalID),
toString(systemID));
xmlSAX2InternalSubset(closure, name, externalID, systemID);
}
static void externalSubsetHandler(void* closure,
const xmlChar*,
const xmlChar* externalId,
const xmlChar*) {
String extId = toString(externalId);
if (extId == "-//W3C//DTD XHTML 1.0 Transitional//EN" ||
extId == "-//W3C//DTD XHTML 1.1//EN" ||
extId == "-//W3C//DTD XHTML 1.0 Strict//EN" ||
extId == "-//W3C//DTD XHTML 1.0 Frameset//EN" ||
extId == "-//W3C//DTD XHTML Basic 1.0//EN" ||
extId == "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" ||
extId == "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" ||
extId == "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" ||
extId == "-//WAPFORUM//DTD XHTML Mobile 1.1//EN" ||
extId == "-//WAPFORUM//DTD XHTML Mobile 1.2//EN") {
// Controls if we replace entities or not.
getParser(closure)->setIsXHTMLDocument(true);
}
}
static void ignorableWhitespaceHandler(void*, const xmlChar*, int) {
// Nothing to do, but we need this to work around a crasher.
// http://bugzilla.gnome.org/show_bug.cgi?id=172255
// http://bugs.webkit.org/show_bug.cgi?id=5792
}
void XMLDocumentParser::initializeParserContext(const CString& chunk) {
xmlSAXHandler sax;
memset(&sax, 0, sizeof(sax));
// According to http://xmlsoft.org/html/libxml-tree.html#xmlSAXHandler and
// http://xmlsoft.org/html/libxml-parser.html#fatalErrorSAXFunc the SAX
// fatalError callback is unused; error gets all the errors. Use
// normalErrorHandler for both the error and fatalError callbacks.
sax.error = normalErrorHandler;
sax.fatalError = normalErrorHandler;
sax.characters = charactersHandler;
sax.processingInstruction = processingInstructionHandler;
sax.cdataBlock = cdataBlockHandler;
sax.comment = commentHandler;
sax.warning = warningHandler;
sax.startElementNs = startElementNsHandler;
sax.endElementNs = endElementNsHandler;
sax.getEntity = getEntityHandler;
sax.startDocument = startDocumentHandler;
sax.endDocument = endDocumentHandler;
sax.internalSubset = internalSubsetHandler;
sax.externalSubset = externalSubsetHandler;
sax.ignorableWhitespace = ignorableWhitespaceHandler;
sax.entityDecl = xmlSAX2EntityDecl;
sax.initialized = XML_SAX2_MAGIC;
m_sawError = false;
m_sawCSS = false;
m_sawXSLTransform = false;
m_sawFirstElement = false;
XMLDocumentParserScope scope(document());
if (m_parsingFragment) {
m_context = XMLParserContext::createMemoryParser(&sax, this, chunk);
} else {
DCHECK(!chunk.data());
m_context = XMLParserContext::createStringParser(&sax, this);
}
}
void XMLDocumentParser::doEnd() {
if (!isStopped()) {
if (m_context) {
// Tell libxml we're done.
{
XMLDocumentParserScope scope(document());
finishParsing(context());
}
m_context = nullptr;
}
}
bool xmlViewerMode = !m_sawError && !m_sawCSS && !m_sawXSLTransform &&
hasNoStyleInformation(document());
if (xmlViewerMode) {
const char noStyleMessage[] =
"This XML file does not appear to have any style information "
"associated with it. The document tree is shown below.";
document()->setIsViewSource(true);
V8Document::PrivateScript::transformDocumentToTreeViewMethod(
document()->frame(), document(), noStyleMessage);
} else if (m_sawXSLTransform) {
xmlDocPtr doc =
xmlDocPtrForString(document(), m_originalSourceForTransform.toString(),
document()->url().getString());
document()->setTransformSource(wrapUnique(new TransformSource(doc)));
DocumentParser::stopParsing();
}
}
xmlDocPtr xmlDocPtrForString(Document* document,
const String& source,
const String& url) {
if (source.isEmpty())
return 0;
// Parse in a single chunk into an xmlDocPtr
// FIXME: Hook up error handlers so that a failure to parse the main
// document results in good error messages.
XMLDocumentParserScope scope(document, errorFunc, 0);
XMLParserInput input(source);
return xmlReadMemory(input.data(), input.size(), url.latin1().data(),
input.encoding(), XSLT_PARSE_OPTIONS);
}
OrdinalNumber XMLDocumentParser::lineNumber() const {
return OrdinalNumber::fromOneBasedInt(context() ? context()->input->line : 1);
}
OrdinalNumber XMLDocumentParser::columnNumber() const {
return OrdinalNumber::fromOneBasedInt(context() ? context()->input->col : 1);
}
TextPosition XMLDocumentParser::textPosition() const {
xmlParserCtxtPtr context = this->context();
if (!context)
return TextPosition::minimumPosition();
return TextPosition(OrdinalNumber::fromOneBasedInt(context->input->line),
OrdinalNumber::fromOneBasedInt(context->input->col));
}
void XMLDocumentParser::stopParsing() {
DocumentParser::stopParsing();
if (context())
xmlStopParser(context());
}
void XMLDocumentParser::resumeParsing() {
DCHECK(!isDetached());
DCHECK(m_parserPaused);
m_parserPaused = false;
// First, execute any pending callbacks
while (!m_pendingCallbacks.isEmpty()) {
std::unique_ptr<PendingCallback> callback = m_pendingCallbacks.takeFirst();
callback->call(this);
// A callback paused the parser
if (m_parserPaused)
return;
}
// Then, write any pending data
SegmentedString rest = m_pendingSrc;
m_pendingSrc.clear();
// There is normally only one string left, so toString() shouldn't copy.
// In any case, the XML parser runs on the main thread and it's OK if
// the passed string has more than one reference.
append(rest.toString().impl());
// Finally, if finish() has been called and write() didn't result
// in any further callbacks being queued, call end()
if (m_finishCalled && m_pendingCallbacks.isEmpty())
end();
}
bool XMLDocumentParser::appendFragmentSource(const String& chunk) {
DCHECK(!m_context);
DCHECK(m_parsingFragment);
CString chunkAsUtf8 = chunk.utf8();
// libxml2 takes an int for a length, and therefore can't handle XML chunks
// larger than 2 GiB.
if (chunkAsUtf8.length() > INT_MAX)
return false;
TRACE_EVENT0("blink", "XMLDocumentParser::appendFragmentSource");
initializeParserContext(chunkAsUtf8);
xmlParseContent(context());
endDocument(); // Close any open text nodes.
// FIXME: If this code is actually needed, it should probably move to
// finish()
// XMLDocumentParserQt has a similar check (m_stream.error() ==
// QXmlStreamReader::PrematureEndOfDocumentError) in doEnd(). Check if all
// the chunk has been processed.
long bytesProcessed = xmlByteConsumed(context());
if (bytesProcessed == -1 ||
static_cast<unsigned long>(bytesProcessed) != chunkAsUtf8.length()) {
// FIXME: I don't believe we can hit this case without also having seen
// an error or a null byte. If we hit this DCHECK, we've found a test
// case which demonstrates the need for this code.
DCHECK(m_sawError ||
(bytesProcessed >= 0 && !chunkAsUtf8.data()[bytesProcessed]));
return false;
}
// No error if the chunk is well formed or it is not but we have no error.
return context()->wellFormed || !xmlCtxtGetLastError(context());
}
// --------------------------------
struct AttributeParseState {
HashMap<String, String> attributes;
bool gotAttributes;
};
static void attributesStartElementNsHandler(void* closure,
const xmlChar* xmlLocalName,
const xmlChar* /*xmlPrefix*/,
const xmlChar* /*xmlURI*/,
int /*nbNamespaces*/,
const xmlChar** /*namespaces*/,
int nbAttributes,
int /*nbDefaulted*/,
const xmlChar** libxmlAttributes) {
if (strcmp(reinterpret_cast<const char*>(xmlLocalName), "attrs") != 0)
return;
xmlParserCtxtPtr ctxt = static_cast<xmlParserCtxtPtr>(closure);
AttributeParseState* state =
static_cast<AttributeParseState*>(ctxt->_private);
state->gotAttributes = true;
xmlSAX2Attributes* attributes =
reinterpret_cast<xmlSAX2Attributes*>(libxmlAttributes);
for (int i = 0; i < nbAttributes; ++i) {
String attrLocalName = toString(attributes[i].localname);
int valueLength = (int)(attributes[i].end - attributes[i].value);
String attrValue = toString(attributes[i].value, valueLength);
String attrPrefix = toString(attributes[i].prefix);
String attrQName =
attrPrefix.isEmpty() ? attrLocalName : attrPrefix + ":" + attrLocalName;
state->attributes.set(attrQName, attrValue);
}
}
HashMap<String, String> parseAttributes(const String& string, bool& attrsOK) {
AttributeParseState state;
state.gotAttributes = false;
xmlSAXHandler sax;
memset(&sax, 0, sizeof(sax));
sax.startElementNs = attributesStartElementNsHandler;
sax.initialized = XML_SAX2_MAGIC;
RefPtr<XMLParserContext> parser =
XMLParserContext::createStringParser(&sax, &state);
String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
parseChunk(parser->context(), parseString);
finishParsing(parser->context());
attrsOK = state.gotAttributes;
return state.attributes;
}
} // namespace blink