XMLDocumentParserLibxml2.cpp [plain text]
#include "config.h"
#include "XMLDocumentParser.h"
#include "CDATASection.h"
#include "CachedScript.h"
#include "Comment.h"
#include "CachedResourceLoader.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "DocumentType.h"
#include "ExceptionCodePlaceholder.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameView.h"
#include "HTMLEntityParser.h"
#include "HTMLHtmlElement.h"
#include "HTMLLinkElement.h"
#include "HTMLNames.h"
#include "HTMLStyleElement.h"
#include "HTMLTemplateElement.h"
#include "Page.h"
#include "ProcessingInstruction.h"
#include "ResourceError.h"
#include "ResourceRequest.h"
#include "ResourceResponse.h"
#include "ScriptElement.h"
#include "ScriptSourceCode.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include "TextResourceDecoder.h"
#include "TransformSource.h"
#include "XMLNSNames.h"
#include "XMLDocumentParserScope.h"
#include <libxml/parserInternals.h>
#include <wtf/Ref.h>
#include <wtf/StringExtras.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
#include <wtf/unicode/UTF8.h>
#if ENABLE(XSLT)
#include "XMLTreeViewer.h"
#include <libxslt/xslt.h>
#endif
namespace WebCore {
#if ENABLE(XSLT)
static inline bool hasNoStyleInformation(Document* document)
{
if (document->sawElementsInKnownNamespaces())
return false;
if (document->transformSourceDocument())
return false;
if (!document->frame() || !document->frame()->page())
return false;
if (!document->frame()->page()->settings().developerExtrasEnabled())
return false;
if (document->frame()->tree().parent())
return false;
return true;
}
#endif
class PendingCallbacks {
WTF_MAKE_NONCOPYABLE(PendingCallbacks); WTF_MAKE_FAST_ALLOCATED;
public:
PendingCallbacks() { }
~PendingCallbacks() { }
void appendStartElementNSCallback(const xmlChar* xmlLocalName, const xmlChar* xmlPrefix, const xmlChar* xmlURI, int nb_namespaces,
const xmlChar** namespaces, int nb_attributes, int nb_defaulted, const xmlChar** attributes)
{
auto callback = std::make_unique<PendingStartElementNSCallback>();
callback->xmlLocalName = xmlStrdup(xmlLocalName);
callback->xmlPrefix = xmlStrdup(xmlPrefix);
callback->xmlURI = xmlStrdup(xmlURI);
callback->nb_namespaces = nb_namespaces;
callback->namespaces = static_cast<xmlChar**>(xmlMalloc(sizeof(xmlChar*) * nb_namespaces * 2));
for (int i = 0; i < nb_namespaces * 2 ; i++)
callback->namespaces[i] = xmlStrdup(namespaces[i]);
callback->nb_attributes = nb_attributes;
callback->nb_defaulted = nb_defaulted;
callback->attributes = static_cast<xmlChar**>(xmlMalloc(sizeof(xmlChar*) * nb_attributes * 5));
for (int i = 0; i < nb_attributes; i++) {
for (int j = 0; j < 3; j++)
callback->attributes[i * 5 + j] = xmlStrdup(attributes[i * 5 + j]);
int len = attributes[i * 5 + 4] - attributes[i * 5 + 3];
callback->attributes[i * 5 + 3] = xmlStrndup(attributes[i * 5 + 3], len);
callback->attributes[i * 5 + 4] = callback->attributes[i * 5 + 3] + len;
}
m_callbacks.append(WTF::move(callback));
}
void appendEndElementNSCallback()
{
m_callbacks.append(std::make_unique<PendingEndElementNSCallback>());
}
void appendCharactersCallback(const xmlChar* s, int len)
{
auto callback = std::make_unique<PendingCharactersCallback>();
callback->s = xmlStrndup(s, len);
callback->len = len;
m_callbacks.append(WTF::move(callback));
}
void appendProcessingInstructionCallback(const xmlChar* target, const xmlChar* data)
{
auto callback = std::make_unique<PendingProcessingInstructionCallback>();
callback->target = xmlStrdup(target);
callback->data = xmlStrdup(data);
m_callbacks.append(WTF::move(callback));
}
void appendCDATABlockCallback(const xmlChar* s, int len)
{
auto callback = std::make_unique<PendingCDATABlockCallback>();
callback->s = xmlStrndup(s, len);
callback->len = len;
m_callbacks.append(WTF::move(callback));
}
void appendCommentCallback(const xmlChar* s)
{
auto callback = std::make_unique<PendingCommentCallback>();
callback->s = xmlStrdup(s);
m_callbacks.append(WTF::move(callback));
}
void appendInternalSubsetCallback(const xmlChar* name, const xmlChar* externalID, const xmlChar* systemID)
{
auto callback = std::make_unique<PendingInternalSubsetCallback>();
callback->name = xmlStrdup(name);
callback->externalID = xmlStrdup(externalID);
callback->systemID = xmlStrdup(systemID);
m_callbacks.append(WTF::move(callback));
}
void appendErrorCallback(XMLErrors::ErrorType type, const xmlChar* message, OrdinalNumber lineNumber, OrdinalNumber columnNumber)
{
auto callback = std::make_unique<PendingErrorCallback>();
callback->message = xmlStrdup(message);
callback->type = type;
callback->lineNumber = lineNumber;
callback->columnNumber = columnNumber;
m_callbacks.append(WTF::move(callback));
}
void callAndRemoveFirstCallback(XMLDocumentParser* parser)
{
std::unique_ptr<PendingCallback> callback = m_callbacks.takeFirst();
callback->call(parser);
}
bool isEmpty() const { return m_callbacks.isEmpty(); }
private:
struct PendingCallback {
virtual ~PendingCallback() { }
virtual void call(XMLDocumentParser* parser) = 0;
};
struct PendingStartElementNSCallback : public PendingCallback {
virtual ~PendingStartElementNSCallback()
{
xmlFree(xmlLocalName);
xmlFree(xmlPrefix);
xmlFree(xmlURI);
for (int i = 0; i < nb_namespaces * 2; i++)
xmlFree(namespaces[i]);
xmlFree(namespaces);
for (int i = 0; i < nb_attributes; i++)
for (int j = 0; j < 4; j++)
xmlFree(attributes[i * 5 + j]);
xmlFree(attributes);
}
virtual void call(XMLDocumentParser* parser)
{
parser->startElementNs(xmlLocalName, xmlPrefix, xmlURI,
nb_namespaces, const_cast<const xmlChar**>(namespaces),
nb_attributes, nb_defaulted, const_cast<const xmlChar**>(attributes));
}
xmlChar* xmlLocalName;
xmlChar* xmlPrefix;
xmlChar* xmlURI;
int nb_namespaces;
xmlChar** namespaces;
int nb_attributes;
int nb_defaulted;
xmlChar** attributes;
};
struct PendingEndElementNSCallback : public PendingCallback {
virtual void call(XMLDocumentParser* parser)
{
parser->endElementNs();
}
};
struct PendingCharactersCallback : public PendingCallback {
virtual ~PendingCharactersCallback()
{
xmlFree(s);
}
virtual void call(XMLDocumentParser* parser)
{
parser->characters(s, len);
}
xmlChar* s;
int len;
};
struct PendingProcessingInstructionCallback : public PendingCallback {
virtual ~PendingProcessingInstructionCallback()
{
xmlFree(target);
xmlFree(data);
}
virtual void call(XMLDocumentParser* parser)
{
parser->processingInstruction(target, data);
}
xmlChar* target;
xmlChar* data;
};
struct PendingCDATABlockCallback : public PendingCallback {
virtual ~PendingCDATABlockCallback()
{
xmlFree(s);
}
virtual void call(XMLDocumentParser* parser)
{
parser->cdataBlock(s, len);
}
xmlChar* s;
int len;
};
struct PendingCommentCallback : public PendingCallback {
virtual ~PendingCommentCallback()
{
xmlFree(s);
}
virtual void call(XMLDocumentParser* parser)
{
parser->comment(s);
}
xmlChar* s;
};
struct PendingInternalSubsetCallback : public PendingCallback {
virtual ~PendingInternalSubsetCallback()
{
xmlFree(name);
xmlFree(externalID);
xmlFree(systemID);
}
virtual void call(XMLDocumentParser* parser)
{
parser->internalSubset(name, externalID, systemID);
}
xmlChar* name;
xmlChar* externalID;
xmlChar* systemID;
};
struct PendingErrorCallback: public PendingCallback {
virtual ~PendingErrorCallback()
{
xmlFree(message);
}
virtual void call(XMLDocumentParser* parser)
{
parser->handleError(type, reinterpret_cast<char*>(message), TextPosition(lineNumber, columnNumber));
}
XMLErrors::ErrorType type;
xmlChar* message;
OrdinalNumber lineNumber;
OrdinalNumber columnNumber;
};
Deque<std::unique_ptr<PendingCallback>> m_callbacks;
};
static int globalDescriptor = 0;
static ThreadIdentifier libxmlLoaderThread = 0;
static int matchFunc(const char*)
{
return XMLDocumentParserScope::currentCachedResourceLoader && currentThread() == libxmlLoaderThread;
}
class OffsetBuffer {
WTF_MAKE_FAST_ALLOCATED;
public:
OffsetBuffer(Vector<char> buffer)
: m_buffer(WTF::move(buffer))
, m_currentOffset(0)
{
}
int readOutBytes(char* outputBuffer, unsigned askedToRead)
{
unsigned bytesLeft = m_buffer.size() - m_currentOffset;
unsigned lenToCopy = std::min(askedToRead, bytesLeft);
if (lenToCopy) {
memcpy(outputBuffer, m_buffer.data() + m_currentOffset, lenToCopy);
m_currentOffset += lenToCopy;
}
return lenToCopy;
}
private:
Vector<char> m_buffer;
unsigned m_currentOffset;
};
static inline void setAttributes(Element* element, Vector<Attribute>& attributeVector, ParserContentPolicy parserContentPolicy)
{
if (!scriptingContentIsAllowed(parserContentPolicy))
element->stripScriptingAttributes(attributeVector);
element->parserSetAttributes(attributeVector);
}
static void switchToUTF16(xmlParserCtxtPtr ctxt)
{
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 bool shouldAllowExternalLoad(const URL& url)
{
String urlString = url.string();
if (urlString == "file:///etc/xml/catalog")
return false;
if (urlString.startsWith("file:///", false) && urlString.endsWith("/etc/catalog", false))
return false;
if (urlString.startsWith("http://www.w3.org/TR/xhtml", false))
return false;
if (urlString.startsWith("http://www.w3.org/Graphics/SVG", false))
return false;
if (!XMLDocumentParserScope::currentCachedResourceLoader->document()->securityOrigin()->canRequest(url)) {
XMLDocumentParserScope::currentCachedResourceLoader->printAccessDeniedMessage(url);
return false;
}
return true;
}
static void* openFunc(const char* uri)
{
ASSERT(XMLDocumentParserScope::currentCachedResourceLoader);
ASSERT(currentThread() == libxmlLoaderThread);
URL url(URL(), uri);
if (!shouldAllowExternalLoad(url))
return &globalDescriptor;
ResourceError error;
ResourceResponse response;
RefPtr<SharedBuffer> data;
{
CachedResourceLoader* cachedResourceLoader = XMLDocumentParserScope::currentCachedResourceLoader;
XMLDocumentParserScope scope(nullptr);
if (cachedResourceLoader->frame())
cachedResourceLoader->frame()->loader().loadResourceSynchronously(url, AllowStoredCredentials, DoNotAskClientForCrossOriginCredentials, error, response, data);
}
if (!shouldAllowExternalLoad(response.url()))
return &globalDescriptor;
Vector<char> buffer;
if (data)
buffer.append(data->data(), data->size());
return new OffsetBuffer(WTF::move(buffer));
}
static int readFunc(void* context, char* buffer, int len)
{
if (context == &globalDescriptor)
return 0;
OffsetBuffer* data = static_cast<OffsetBuffer*>(context);
return data->readOutBytes(buffer, len);
}
static int writeFunc(void*, const char*, int)
{
return 0;
}
static int closeFunc(void* context)
{
if (context != &globalDescriptor) {
OffsetBuffer* data = static_cast<OffsetBuffer*>(context);
delete data;
}
return 0;
}
#if ENABLE(XSLT)
static void errorFunc(void*, const char*, ...)
{
}
#endif
static bool didInit = false;
Ref<XMLParserContext> XMLParserContext::createStringParser(xmlSAXHandlerPtr handlers, void* userData)
{
if (!didInit) {
xmlInitParser();
xmlRegisterInputCallbacks(matchFunc, openFunc, readFunc, closeFunc);
xmlRegisterOutputCallbacks(matchFunc, openFunc, writeFunc, closeFunc);
libxmlLoaderThread = currentThread();
didInit = true;
}
xmlParserCtxtPtr parser = xmlCreatePushParserCtxt(handlers, 0, 0, 0, 0);
parser->_private = userData;
xmlCtxtUseOptions(parser, XML_PARSE_NOENT);
switchToUTF16(parser);
return adoptRef(*new XMLParserContext(parser));
}
RefPtr<XMLParserContext> XMLParserContext::createMemoryParser(xmlSAXHandlerPtr handlers, void* userData, const CString& chunk)
{
if (!didInit) {
xmlInitParser();
xmlRegisterInputCallbacks(matchFunc, openFunc, readFunc, closeFunc);
xmlRegisterOutputCallbacks(matchFunc, openFunc, writeFunc, closeFunc);
libxmlLoaderThread = currentThread();
didInit = true;
}
xmlParserCtxtPtr parser = xmlCreateMemoryParserCtxt(chunk.data(), chunk.length());
if (!parser)
return 0;
memcpy(parser->sax, handlers, sizeof(xmlSAXHandler));
xmlCtxtUseOptions(parser, XML_PARSE_NODICT | XML_PARSE_NOENT);
parser->sax2 = 1;
parser->instate = XML_PARSER_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_view(frameView)
, m_context(nullptr)
, m_pendingCallbacks(std::make_unique<PendingCallbacks>())
, m_depthTriggeringEntityExpansion(-1)
, m_isParsingEntityDeclaration(false)
, m_currentNode(&document)
, 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_pendingScript(nullptr)
, m_scriptStartPosition(TextPosition::belowRangePosition())
, m_parsingFragment(false)
{
}
XMLDocumentParser::XMLDocumentParser(DocumentFragment& fragment, Element* parentElement, ParserContentPolicy parserContentPolicy)
: ScriptableDocumentParser(fragment.document(), parserContentPolicy)
, m_view(nullptr)
, m_context(nullptr)
, m_pendingCallbacks(std::make_unique<PendingCallbacks>())
, m_depthTriggeringEntityExpansion(-1)
, m_isParsingEntityDeclaration(false)
, m_currentNode(&fragment)
, 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_pendingScript(0)
, m_scriptStartPosition(TextPosition::belowRangePosition())
, m_parsingFragment(true)
{
fragment.ref();
Vector<Element*> elemStack;
while (parentElement) {
elemStack.append(parentElement);
ContainerNode* node = parentElement->parentNode();
if (!is<Element>(node))
break;
parentElement = downcast<Element>(node);
}
if (elemStack.isEmpty())
return;
for (; !elemStack.isEmpty(); elemStack.removeLast()) {
Element* element = elemStack.last();
if (element->hasAttributes()) {
for (const Attribute& attribute : element->attributesIterator()) {
if (attribute.localName() == xmlnsAtom)
m_defaultNamespaceURI = attribute.value();
else if (attribute.prefix() == xmlnsAtom)
m_prefixToNamespaceMap.set(attribute.localName(), attribute.value());
}
}
}
if (m_defaultNamespaceURI.isNull())
m_defaultNamespaceURI = parentElement->namespaceURI();
}
XMLParserContext::~XMLParserContext()
{
if (m_context->myDoc)
xmlFreeDoc(m_context->myDoc);
xmlFreeParserCtxt(m_context);
}
XMLDocumentParser::~XMLDocumentParser()
{
ASSERT(m_currentNodeStack.isEmpty());
ASSERT(!m_currentNode);
if (m_pendingScript)
m_pendingScript->removeClient(this);
}
void XMLDocumentParser::doWrite(const String& parseString)
{
ASSERT(!isDetached());
if (!m_context)
initializeParserContext();
RefPtr<XMLParserContext> context = m_context;
if (parseString.length()) {
Ref<XMLDocumentParser> protect(*this);
XMLDocumentParserScope scope(&document()->cachedResourceLoader());
switchToUTF16(context->context());
xmlParseChunk(context->context(), reinterpret_cast<const char*>(StringView(parseString).upconvertedCharacters().get()), sizeof(UChar) * parseString.length(), 0);
if (isStopped())
return;
}
if (document()->decoder() && document()->decoder()->sawError()) {
TextPosition position(OrdinalNumber::fromOneBasedInt(context->context()->input->line), OrdinalNumber::fromOneBasedInt(context->context()->input->col));
handleError(XMLErrors::fatal, "Encoding error", position);
}
}
static inline String toString(const xmlChar* string, size_t size)
{
return String::fromUTF8(reinterpret_cast<const char*>(string), size);
}
static inline String toString(const xmlChar* string)
{
return String::fromUTF8(reinterpret_cast<const char*>(string));
}
static inline AtomicString toAtomicString(const xmlChar* string, size_t size)
{
return AtomicString::fromUTF8(reinterpret_cast<const char*>(string), size);
}
static inline AtomicString toAtomicString(const xmlChar* string)
{
return AtomicString::fromUTF8(reinterpret_cast<const char*>(string));
}
struct _xmlSAX2Namespace {
const xmlChar* prefix;
const xmlChar* uri;
};
typedef struct _xmlSAX2Namespace xmlSAX2Namespace;
static inline void handleNamespaceAttributes(Vector<Attribute>& prefixedAttributes, const xmlChar** libxmlNamespaces, int nb_namespaces, ExceptionCode& ec)
{
xmlSAX2Namespace* namespaces = reinterpret_cast<xmlSAX2Namespace*>(libxmlNamespaces);
for (int i = 0; i < nb_namespaces; i++) {
AtomicString namespaceQName = xmlnsAtom;
AtomicString namespaceURI = toAtomicString(namespaces[i].uri);
if (namespaces[i].prefix)
namespaceQName = "xmlns:" + toString(namespaces[i].prefix);
QualifiedName parsedName = anyName;
if (!Element::parseAttributeName(parsedName, XMLNSNames::xmlnsNamespaceURI, namespaceQName, ec))
return;
prefixedAttributes.append(Attribute(parsedName, namespaceURI));
}
}
struct _xmlSAX2Attributes {
const xmlChar* localname;
const xmlChar* prefix;
const xmlChar* uri;
const xmlChar* value;
const xmlChar* end;
};
typedef struct _xmlSAX2Attributes xmlSAX2Attributes;
static inline void handleElementAttributes(Vector<Attribute>& prefixedAttributes, const xmlChar** libxmlAttributes, int nb_attributes, ExceptionCode& ec)
{
xmlSAX2Attributes* attributes = reinterpret_cast<xmlSAX2Attributes*>(libxmlAttributes);
for (int i = 0; i < nb_attributes; i++) {
int valueLength = static_cast<int>(attributes[i].end - attributes[i].value);
AtomicString attrValue = toAtomicString(attributes[i].value, valueLength);
String attrPrefix = toString(attributes[i].prefix);
AtomicString attrURI = attrPrefix.isEmpty() ? AtomicString() : toAtomicString(attributes[i].uri);
AtomicString attrQName = attrPrefix.isEmpty() ? toAtomicString(attributes[i].localname) : attrPrefix + ":" + toString(attributes[i].localname);
QualifiedName parsedName = anyName;
if (!Element::parseAttributeName(parsedName, attrURI, attrQName, ec))
return;
prefixedAttributes.append(Attribute(parsedName, attrValue));
}
}
static inline bool hackAroundLibXMLEntityParsingBug()
{
#if LIBXML_VERSION >= 20704
return false;
#else
return true;
#endif
}
void XMLDocumentParser::startElementNs(const xmlChar* xmlLocalName, const xmlChar* xmlPrefix, const xmlChar* xmlURI, int nb_namespaces,
const xmlChar** libxmlNamespaces, int nb_attributes, int nb_defaulted, const xmlChar** libxmlAttributes)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendStartElementNSCallback(xmlLocalName, xmlPrefix, xmlURI, nb_namespaces, libxmlNamespaces,
nb_attributes, nb_defaulted, libxmlAttributes);
return;
}
exitText();
AtomicString localName = toAtomicString(xmlLocalName);
AtomicString uri = toAtomicString(xmlURI);
AtomicString prefix = toAtomicString(xmlPrefix);
if (m_parsingFragment && uri.isNull()) {
if (!prefix.isNull())
uri = m_prefixToNamespaceMap.get(prefix);
else
uri = m_defaultNamespaceURI;
}
if (hackAroundLibXMLEntityParsingBug() && depthTriggeringEntityExpansion() != -1 && context()->depth > depthTriggeringEntityExpansion() && uri.isNull() && prefix.isNull())
uri = m_currentNode->namespaceURI();
bool isFirstElement = !m_sawFirstElement;
m_sawFirstElement = true;
QualifiedName qName(prefix, localName, uri);
RefPtr<Element> newElement = m_currentNode->document().createElement(qName, true);
if (!newElement) {
stopParsing();
return;
}
Vector<Attribute> prefixedAttributes;
ExceptionCode ec = 0;
handleNamespaceAttributes(prefixedAttributes, libxmlNamespaces, nb_namespaces, ec);
if (ec) {
setAttributes(newElement.get(), prefixedAttributes, parserContentPolicy());
stopParsing();
return;
}
handleElementAttributes(prefixedAttributes, libxmlAttributes, nb_attributes, ec);
setAttributes(newElement.get(), prefixedAttributes, parserContentPolicy());
if (ec) {
stopParsing();
return;
}
newElement->beginParsingChildren();
ScriptElement* scriptElement = toScriptElementIfPossible(newElement.get());
if (scriptElement)
m_scriptStartPosition = textPosition();
m_currentNode->parserAppendChild(newElement.get());
if (!m_currentNode) return;
#if ENABLE(TEMPLATE_ELEMENT)
if (is<HTMLTemplateElement>(*newElement))
pushCurrentNode(downcast<HTMLTemplateElement>(*newElement).content());
else
pushCurrentNode(newElement.get());
#else
pushCurrentNode(newElement.get());
#endif
if (is<HTMLHtmlElement>(*newElement))
downcast<HTMLHtmlElement>(*newElement).insertedByParser();
if (!m_parsingFragment && isFirstElement && document()->frame())
document()->frame()->injectUserScripts(InjectAtDocumentStart);
}
void XMLDocumentParser::endElementNs()
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendEndElementNSCallback();
return;
}
Ref<XMLDocumentParser> protect(*this);
exitText();
RefPtr<ContainerNode> node = m_currentNode;
node->finishParsingChildren();
if (hackAroundLibXMLEntityParsingBug() && context()->depth <= depthTriggeringEntityExpansion())
setDepthTriggeringEntityExpansion(-1);
if (!scriptingContentIsAllowed(parserContentPolicy()) && is<Element>(*node) && toScriptElementIfPossible(downcast<Element>(node.get()))) {
popCurrentNode();
node->remove(IGNORE_EXCEPTION);
return;
}
if (!node->isElementNode() || !m_view) {
popCurrentNode();
return;
}
Element& element = downcast<Element>(*node);
if (!element.inDocument()) {
popCurrentNode();
return;
}
ScriptElement* scriptElement = toScriptElementIfPossible(&element);
if (!scriptElement) {
popCurrentNode();
return;
}
ASSERT(!m_pendingScript);
m_requestingScript = true;
if (scriptElement->prepareScript(m_scriptStartPosition, ScriptElement::AllowLegacyTypeInTypeAttribute)) {
if (scriptElement->readyToBeParserExecuted())
scriptElement->executeScript(ScriptSourceCode(scriptElement->scriptContent(), document()->url(), m_scriptStartPosition));
else if (scriptElement->willBeParserExecuted()) {
m_pendingScript = scriptElement->cachedScript();
m_scriptElement = &element;
m_pendingScript->addClient(this);
if (m_pendingScript)
pauseParsing();
} else
m_scriptElement = nullptr;
if (isDetached())
return;
}
m_requestingScript = false;
popCurrentNode();
}
void XMLDocumentParser::characters(const xmlChar* s, int len)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendCharactersCallback(s, len);
return;
}
if (!m_leafTextNode)
enterText();
m_bufferedText.append(s, len);
}
void XMLDocumentParser::error(XMLErrors::ErrorType type, const char* message, va_list args)
{
if (isStopped())
return;
#if HAVE(VASPRINTF)
char* m;
if (vasprintf(&m, message, args) == -1)
return;
#else
char m[1024];
vsnprintf(m, sizeof(m) - 1, message, args);
#endif
TextPosition position = textPosition();
if (m_parserPaused)
m_pendingCallbacks->appendErrorCallback(type, reinterpret_cast<const xmlChar*>(m), position.m_line, position.m_column);
else
handleError(type, m, textPosition());
#if HAVE(VASPRINTF)
free(m);
#endif
}
void XMLDocumentParser::processingInstruction(const xmlChar* target, const xmlChar* data)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendProcessingInstructionCallback(target, data);
return;
}
exitText();
ExceptionCode ec = 0;
RefPtr<ProcessingInstruction> pi = m_currentNode->document().createProcessingInstruction(
toString(target), toString(data), ec);
if (ec)
return;
pi->setCreatedByParser(true);
m_currentNode->parserAppendChild(pi.get());
pi->finishParsingChildren();
if (pi->isCSS())
m_sawCSS = true;
#if ENABLE(XSLT)
m_sawXSLTransform = !m_sawFirstElement && pi->isXSL();
if (m_sawXSLTransform && !document()->transformSourceDocument())
stopParsing();
#endif
}
void XMLDocumentParser::cdataBlock(const xmlChar* s, int len)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendCDATABlockCallback(s, len);
return;
}
exitText();
RefPtr<CDATASection> newNode = CDATASection::create(m_currentNode->document(), toString(s, len));
m_currentNode->parserAppendChild(newNode.release());
}
void XMLDocumentParser::comment(const xmlChar* s)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendCommentCallback(s);
return;
}
exitText();
RefPtr<Comment> newNode = Comment::create(m_currentNode->document(), toString(s));
m_currentNode->parserAppendChild(newNode.release());
}
enum StandaloneInfo {
StandaloneUnspecified = -2,
NoXMlDeclaration,
StandaloneNo,
StandaloneYes
};
void XMLDocumentParser::startDocument(const xmlChar* version, const xmlChar* encoding, int standalone)
{
StandaloneInfo standaloneInfo = (StandaloneInfo)standalone;
if (standaloneInfo == NoXMlDeclaration) {
document()->setHasXMLDeclaration(false);
return;
}
if (version)
document()->setXMLVersion(toString(version), ASSERT_NO_EXCEPTION);
if (standalone != StandaloneUnspecified)
document()->setXMLStandalone(standaloneInfo == StandaloneYes, ASSERT_NO_EXCEPTION);
if (encoding)
document()->setXMLEncoding(toString(encoding));
document()->setHasXMLDeclaration(true);
}
void XMLDocumentParser::endDocument()
{
exitText();
}
void XMLDocumentParser::internalSubset(const xmlChar* name, const xmlChar* externalID, const xmlChar* systemID)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendInternalSubsetCallback(name, externalID, systemID);
return;
}
if (document())
document()->parserAppendChild(DocumentType::create(*document(), toString(name), toString(externalID), toString(systemID)));
}
static inline XMLDocumentParser* getParser(void* closure)
{
xmlParserCtxtPtr ctxt = static_cast<xmlParserCtxtPtr>(closure);
return static_cast<XMLDocumentParser*>(ctxt->_private);
}
static inline bool hackAroundLibXMLEntityBug(void* closure)
{
#if LIBXML_VERSION >= 20627
UNUSED_PARAM(closure);
return false;
#else
return static_cast<xmlParserCtxtPtr>(closure)->node;
#endif
}
static void startElementNsHandler(void* closure, const xmlChar* localname, const xmlChar* prefix, const xmlChar* uri, int nb_namespaces, const xmlChar** namespaces, int nb_attributes, int nb_defaulted, const xmlChar** libxmlAttributes)
{
if (hackAroundLibXMLEntityBug(closure))
return;
getParser(closure)->startElementNs(localname, prefix, uri, nb_namespaces, namespaces, nb_attributes, nb_defaulted, libxmlAttributes);
}
static void endElementNsHandler(void* closure, const xmlChar*, const xmlChar*, const xmlChar*)
{
if (hackAroundLibXMLEntityBug(closure))
return;
getParser(closure)->endElementNs();
}
static void charactersHandler(void* closure, const xmlChar* s, int len)
{
if (hackAroundLibXMLEntityBug(closure))
return;
getParser(closure)->characters(s, len);
}
static void processingInstructionHandler(void* closure, const xmlChar* target, const xmlChar* data)
{
if (hackAroundLibXMLEntityBug(closure))
return;
getParser(closure)->processingInstruction(target, data);
}
static void cdataBlockHandler(void* closure, const xmlChar* s, int len)
{
if (hackAroundLibXMLEntityBug(closure))
return;
getParser(closure)->cdataBlock(s, len);
}
static void commentHandler(void* closure, const xmlChar* comment)
{
if (hackAroundLibXMLEntityBug(closure))
return;
getParser(closure)->comment(comment);
}
WTF_ATTRIBUTE_PRINTF(2, 3)
static void warningHandler(void* closure, const char* message, ...)
{
va_list args;
va_start(args, message);
getParser(closure)->error(XMLErrors::warning, message, args);
va_end(args);
}
WTF_ATTRIBUTE_PRINTF(2, 3)
static void fatalErrorHandler(void* closure, const char* message, ...)
{
va_list args;
va_start(args, message);
getParser(closure)->error(XMLErrors::fatal, 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::nonFatal, message, args);
va_end(args);
}
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;
ASSERT(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;
ASSERT(numberOfCodeUnits <= 4);
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 void entityDeclarationHandler(void* closure, const xmlChar* name, int type, const xmlChar* publicId, const xmlChar* systemId, xmlChar* content)
{
if (hackAroundLibXMLEntityParsingBug())
getParser(closure)->setIsParsingEntityDeclaration(true);
xmlSAX2EntityDecl(closure, name, type, publicId, systemId, content);
}
static xmlEntityPtr getEntityHandler(void* closure, const xmlChar* name)
{
xmlParserCtxtPtr ctxt = static_cast<xmlParserCtxtPtr>(closure);
XMLDocumentParser* parser = getParser(closure);
if (hackAroundLibXMLEntityParsingBug()) {
if (parser->isParsingEntityDeclaration()) {
parser->setIsParsingEntityDeclaration(false);
ASSERT(parser->depthTriggeringEntityExpansion() == -1);
} else {
parser->setDepthTriggeringEntityExpansion(ctxt->depth);
}
}
xmlEntityPtr ent = xmlGetPredefinedEntity(name);
if (ent) {
ent->etype = XML_INTERNAL_PREDEFINED_ENTITY;
return ent;
}
ent = xmlGetDocEntity(ctxt->myDoc, name);
if (!ent && parser->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);
switchToUTF16(ctxt);
getParser(closure)->startDocument(ctxt->version, 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(name, externalID, 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"))
getParser(closure)->setIsXHTMLDocument(true); }
static void ignorableWhitespaceHandler(void*, const xmlChar*, int)
{
}
void XMLDocumentParser::initializeParserContext(const CString& chunk)
{
xmlSAXHandler sax;
memset(&sax, 0, sizeof(sax));
sax.error = normalErrorHandler;
sax.fatalError = fatalErrorHandler;
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 = entityDeclarationHandler;
sax.initialized = XML_SAX2_MAGIC;
DocumentParser::startParsing();
m_sawError = false;
m_sawCSS = false;
m_sawXSLTransform = false;
m_sawFirstElement = false;
XMLDocumentParserScope scope(&document()->cachedResourceLoader());
if (m_parsingFragment)
m_context = XMLParserContext::createMemoryParser(&sax, this, chunk);
else {
ASSERT(!chunk.data());
m_context = XMLParserContext::createStringParser(&sax, this);
}
}
void XMLDocumentParser::doEnd()
{
if (!isStopped()) {
if (m_context) {
{
XMLDocumentParserScope scope(&document()->cachedResourceLoader());
xmlParseChunk(context(), 0, 0, 1);
}
m_context = nullptr;
}
}
#if ENABLE(XSLT)
bool xmlViewerMode = !m_sawError && !m_sawCSS && !m_sawXSLTransform && hasNoStyleInformation(document());
if (xmlViewerMode) {
XMLTreeViewer xmlTreeViewer(*document());
xmlTreeViewer.transformDocumentToTreeView();
} else if (m_sawXSLTransform) {
void* doc = xmlDocPtrForString(document()->cachedResourceLoader(), m_originalSourceForTransform.toString(), document()->url().string());
document()->setTransformSource(std::make_unique<TransformSource>(doc));
document()->setParsing(false); document()->styleResolverChanged(RecalcStyleImmediately);
if (isDetached())
return;
document()->setParsing(true);
DocumentParser::stopParsing();
}
#endif
}
#if ENABLE(XSLT)
static inline const char* nativeEndianUTF16Encoding()
{
const UChar BOM = 0xFEFF;
const unsigned char BOMHighByte = *reinterpret_cast<const unsigned char*>(&BOM);
return BOMHighByte == 0xFF ? "UTF-16LE" : "UTF-16BE";
}
void* xmlDocPtrForString(CachedResourceLoader& cachedResourceLoader, const String& source, const String& url)
{
if (source.isEmpty())
return nullptr;
const bool is8Bit = source.is8Bit();
const char* characters = is8Bit ? reinterpret_cast<const char*>(source.characters8()) : reinterpret_cast<const char*>(source.characters16());
size_t sizeInBytes = source.length() * (is8Bit ? sizeof(LChar) : sizeof(UChar));
const char* encoding = is8Bit ? "iso-8859-1" : nativeEndianUTF16Encoding();
XMLDocumentParserScope scope(&cachedResourceLoader, errorFunc);
return xmlReadMemory(characters, sizeInBytes, url.latin1().data(), encoding, XSLT_PARSE_OPTIONS);
}
#endif
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));
}
bool XMLDocumentParser::shouldAssociateConsoleMessagesWithTextPosition() const
{
return !m_parserPaused && !m_requestingScript;
}
void XMLDocumentParser::stopParsing()
{
DocumentParser::stopParsing();
if (context())
xmlStopParser(context());
}
void XMLDocumentParser::resumeParsing()
{
ASSERT(!isDetached());
ASSERT(m_parserPaused);
m_parserPaused = false;
while (!m_pendingCallbacks->isEmpty()) {
m_pendingCallbacks->callAndRemoveFirstCallback(this);
if (m_parserPaused)
return;
}
SegmentedString rest = m_pendingSrc;
m_pendingSrc.clear();
append(rest.toString().impl());
if (m_finishCalled && m_pendingCallbacks->isEmpty())
end();
}
bool XMLDocumentParser::appendFragmentSource(const String& chunk)
{
ASSERT(!m_context);
ASSERT(m_parsingFragment);
CString chunkAsUtf8 = chunk.utf8();
if (chunkAsUtf8.length() > INT_MAX)
return false;
initializeParserContext(chunkAsUtf8);
xmlParseContent(context());
endDocument();
long bytesProcessed = xmlByteConsumed(context());
if (bytesProcessed == -1 || ((unsigned long)bytesProcessed) != chunkAsUtf8.length()) {
ASSERT(m_sawError || (bytesProcessed >= 0 && !chunkAsUtf8.data()[bytesProcessed]));
return false;
}
return context()->wellFormed || !xmlCtxtGetLastError(context());
}
struct AttributeParseState {
HashMap<String, String> attributes;
bool gotAttributes;
};
static void attributesStartElementNsHandler(void* closure, const xmlChar* xmlLocalName, const xmlChar* ,
const xmlChar* , int , const xmlChar** ,
int nb_attributes, int , 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 < nb_attributes; 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)
{
String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
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);
xmlParseChunk(parser->context(), reinterpret_cast<const char*>(StringView(parseString).upconvertedCharacters().get()), parseString.length() * sizeof(UChar), 1);
attrsOK = state.gotAttributes;
return WTF::move(state.attributes);
}
}