blob: 5fbc7a0794c47bdaddffb54c3413b272a46fcd0d [file] [log] [blame]
/*
* Copyright (C) 2000 Peter Kelly <pmk@post.com>
* Copyright (C) 2005-2017 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, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
* Copyright (C) 2013 Samsung Electronics. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "XMLDocumentParser.h"
#include "CDATASection.h"
#include "Comment.h"
#include "CachedResourceLoader.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "DocumentType.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "HTMLEntityParser.h"
#include "HTMLHtmlElement.h"
#include "HTMLParserIdioms.h"
#include "HTMLTemplateElement.h"
#include "HTTPParsers.h"
#include "InlineClassicScript.h"
#include "MIMETypeRegistry.h"
#include "Page.h"
#include "PageConsoleClient.h"
#include "PendingScript.h"
#include "ProcessingInstruction.h"
#include "ResourceError.h"
#include "ResourceResponse.h"
#include "SVGElement.h"
#include "ScriptElement.h"
#include "ScriptSourceCode.h"
#include "Settings.h"
#include "SharedBuffer.h"
#include "StyleScope.h"
#include "TransformSource.h"
#include "XMLNSNames.h"
#include "XMLDocumentParserScope.h"
#include <libxml/parserInternals.h>
#include <wtf/unicode/UTF8Conversion.h>
#if ENABLE(XSLT)
#include "XMLTreeViewer.h"
#include <libxslt/xslt.h>
#endif
namespace WebCore {
#if ENABLE(XSLT)
static inline bool shouldRenderInXMLTreeViewerMode(Document& document)
{
if (document.sawElementsInKnownNamespaces())
return false;
if (document.transformSourceDocument())
return false;
auto* frame = document.frame();
if (!frame)
return false;
if (!frame->settings().developerExtrasEnabled())
return false;
if (frame->tree().parent())
return false; // This document is not in a top frame
return true;
}
#endif
class PendingCallbacks {
WTF_MAKE_FAST_ALLOCATED;
public:
void appendStartElementNSCallback(const xmlChar* xmlLocalName, const xmlChar* xmlPrefix, const xmlChar* xmlURI, int numNamespaces, const xmlChar** namespaces, int numAttributes, int numDefaulted, const xmlChar** attributes)
{
auto callback = makeUnique<PendingStartElementNSCallback>();
callback->xmlLocalName = xmlStrdup(xmlLocalName);
callback->xmlPrefix = xmlStrdup(xmlPrefix);
callback->xmlURI = xmlStrdup(xmlURI);
callback->numNamespaces = numNamespaces;
callback->namespaces = static_cast<xmlChar**>(xmlMalloc(sizeof(xmlChar*) * numNamespaces * 2));
for (int i = 0; i < numNamespaces * 2 ; i++)
callback->namespaces[i] = xmlStrdup(namespaces[i]);
callback->numAttributes = numAttributes;
callback->numDefaulted = numDefaulted;
callback->attributes = static_cast<xmlChar**>(xmlMalloc(sizeof(xmlChar*) * numAttributes * 5));
for (int i = 0; i < numAttributes; i++) {
// Each attribute has 5 elements in the array:
// name, prefix, uri, value and an end pointer.
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(WTFMove(callback));
}
void appendEndElementNSCallback()
{
m_callbacks.append(makeUnique<PendingEndElementNSCallback>());
}
void appendCharactersCallback(const xmlChar* s, int len)
{
auto callback = makeUnique<PendingCharactersCallback>();
callback->s = xmlStrndup(s, len);
callback->len = len;
m_callbacks.append(WTFMove(callback));
}
void appendProcessingInstructionCallback(const xmlChar* target, const xmlChar* data)
{
auto callback = makeUnique<PendingProcessingInstructionCallback>();
callback->target = xmlStrdup(target);
callback->data = xmlStrdup(data);
m_callbacks.append(WTFMove(callback));
}
void appendCDATABlockCallback(const xmlChar* s, int len)
{
auto callback = makeUnique<PendingCDATABlockCallback>();
callback->s = xmlStrndup(s, len);
callback->len = len;
m_callbacks.append(WTFMove(callback));
}
void appendCommentCallback(const xmlChar* s)
{
auto callback = makeUnique<PendingCommentCallback>();
callback->s = xmlStrdup(s);
m_callbacks.append(WTFMove(callback));
}
void appendInternalSubsetCallback(const xmlChar* name, const xmlChar* externalID, const xmlChar* systemID)
{
auto callback = makeUnique<PendingInternalSubsetCallback>();
callback->name = xmlStrdup(name);
callback->externalID = xmlStrdup(externalID);
callback->systemID = xmlStrdup(systemID);
m_callbacks.append(WTFMove(callback));
}
void appendErrorCallback(XMLErrors::ErrorType type, const xmlChar* message, OrdinalNumber lineNumber, OrdinalNumber columnNumber)
{
auto callback = makeUnique<PendingErrorCallback>();
callback->message = xmlStrdup(message);
callback->type = type;
callback->lineNumber = lineNumber;
callback->columnNumber = columnNumber;
m_callbacks.append(WTFMove(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 {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
virtual ~PendingCallback() = default;
virtual void call(XMLDocumentParser* parser) = 0;
};
struct PendingStartElementNSCallback : public PendingCallback {
virtual ~PendingStartElementNSCallback()
{
xmlFree(xmlLocalName);
xmlFree(xmlPrefix);
xmlFree(xmlURI);
for (int i = 0; i < numNamespaces * 2; i++)
xmlFree(namespaces[i]);
xmlFree(namespaces);
for (int i = 0; i < numAttributes; i++) {
for (int j = 0; j < 4; j++)
xmlFree(attributes[i * 5 + j]);
}
xmlFree(attributes);
}
void call(XMLDocumentParser* parser) override
{
parser->startElementNs(xmlLocalName, xmlPrefix, xmlURI, numNamespaces, const_cast<const xmlChar**>(namespaces), numAttributes, numDefaulted, const_cast<const xmlChar**>(attributes));
}
xmlChar* xmlLocalName;
xmlChar* xmlPrefix;
xmlChar* xmlURI;
int numNamespaces;
xmlChar** namespaces;
int numAttributes;
int numDefaulted;
xmlChar** attributes;
};
struct PendingEndElementNSCallback : public PendingCallback {
void call(XMLDocumentParser* parser) override
{
parser->endElementNs();
}
};
struct PendingCharactersCallback : public PendingCallback {
virtual ~PendingCharactersCallback()
{
xmlFree(s);
}
void call(XMLDocumentParser* parser) override
{
parser->characters(s, len);
}
xmlChar* s;
int len;
};
struct PendingProcessingInstructionCallback : public PendingCallback {
virtual ~PendingProcessingInstructionCallback()
{
xmlFree(target);
xmlFree(data);
}
void call(XMLDocumentParser* parser) override
{
parser->processingInstruction(target, data);
}
xmlChar* target;
xmlChar* data;
};
struct PendingCDATABlockCallback : public PendingCallback {
virtual ~PendingCDATABlockCallback()
{
xmlFree(s);
}
void call(XMLDocumentParser* parser) override
{
parser->cdataBlock(s, len);
}
xmlChar* s;
int len;
};
struct PendingCommentCallback : public PendingCallback {
virtual ~PendingCommentCallback()
{
xmlFree(s);
}
void call(XMLDocumentParser* parser) override
{
parser->comment(s);
}
xmlChar* s;
};
struct PendingInternalSubsetCallback : public PendingCallback {
virtual ~PendingInternalSubsetCallback()
{
xmlFree(name);
xmlFree(externalID);
xmlFree(systemID);
}
void call(XMLDocumentParser* parser) override
{
parser->internalSubset(name, externalID, systemID);
}
xmlChar* name;
xmlChar* externalID;
xmlChar* systemID;
};
struct PendingErrorCallback: public PendingCallback {
virtual ~PendingErrorCallback()
{
xmlFree(message);
}
void call(XMLDocumentParser* parser) override
{
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 Thread* libxmlLoaderThread { nullptr };
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::currentCachedResourceLoader && libxmlLoaderThread == &Thread::current();
}
class OffsetBuffer {
WTF_MAKE_FAST_ALLOCATED;
public:
OffsetBuffer(Vector<char> buffer)
: m_buffer(WTFMove(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 bool externalEntityMimeTypeAllowed(const ResourceResponse& response)
{
String contentType = response.httpHeaderField(HTTPHeaderName::ContentType);
String mimeType = extractMIMETypeFromMediaType(contentType);
if (mimeType.isEmpty()) {
// Same logic as XMLHttpRequest::responseMIMEType(). Keep them in sync.
if (response.isInHTTPFamily())
mimeType = contentType;
else
mimeType = response.mimeType();
}
return MIMETypeRegistry::isXMLMIMEType(mimeType) || MIMETypeRegistry::isXMLEntityMIMEType(mimeType);
}
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)
{
// 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.
// FIXME: Can we just use XML_PARSE_IGNORE_ENC now?
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();
// On non-Windows platforms libxml asks for this URL, the "XML_XML_DEFAULT_CATALOG", on initialization.
if (urlString == "file:///etc/xml/catalog")
return false;
// On Windows, libxml computes a URL relative to where its DLL resides.
if (startsWithLettersIgnoringASCIICase(urlString, "file:///") && urlString.endsWithIgnoringASCIICase("/etc/catalog"))
return false;
// The most common DTD. There isn't much point in hammering www.w3c.org by requesting this for every XHTML document.
if (startsWithLettersIgnoringASCIICase(urlString, "http://www.w3.org/tr/xhtml"))
return false;
// Similarly, there isn't much point in requesting the SVG DTD.
if (startsWithLettersIgnoringASCIICase(urlString, "http://www.w3.org/graphics/svg"))
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::currentCachedResourceLoader->document()->securityOrigin().canRequest(url)) {
XMLDocumentParserScope::currentCachedResourceLoader->printAccessDeniedMessage(url);
return false;
}
return true;
}
static void* openFunc(const char* uri)
{
ASSERT(XMLDocumentParserScope::currentCachedResourceLoader);
ASSERT(libxmlLoaderThread == &Thread::current());
CachedResourceLoader& cachedResourceLoader = *XMLDocumentParserScope::currentCachedResourceLoader;
Document* document = cachedResourceLoader.document();
// Same logic as HTMLBaseElement::href(). Keep them in sync.
auto* encoding = (document && document->decoder()) ? document->decoder()->encodingForURLParsing() : nullptr;
URL url(document ? document->url() : URL(), stripLeadingAndTrailingHTMLSpaces(uri), encoding);
if (!shouldAllowExternalLoad(url))
return &globalDescriptor;
ResourceResponse response;
RefPtr<SharedBuffer> data;
{
ResourceError error;
XMLDocumentParserScope scope(nullptr);
// FIXME: We should restore the original global error handler as well.
if (cachedResourceLoader.frame()) {
FetchOptions options;
options.mode = FetchOptions::Mode::SameOrigin;
options.credentials = FetchOptions::Credentials::Include;
cachedResourceLoader.frame()->loader().loadResourceSynchronously(url, ClientCredentialPolicy::MayAskClientForCredentials, options, { }, error, response, data);
if (response.url().isEmpty()) {
if (Page* page = document ? document->page() : nullptr)
page->console().addMessage(MessageSource::Security, MessageLevel::Error, makeString("Did not parse external entity resource at '", url.stringCenterEllipsizedToLength(), "' because cross-origin loads are not allowed."));
return &globalDescriptor;
}
if (!externalEntityMimeTypeAllowed(response)) {
if (Page* page = document ? document->page() : nullptr)
page->console().addMessage(MessageSource::Security, MessageLevel::Error, makeString("Did not parse external entity resource at '", url.stringCenterEllipsizedToLength(), "' because only XML MIME types are allowed."));
return &globalDescriptor;
}
}
}
Vector<char> buffer;
if (data)
buffer.append(data->data(), data->size());
return new OffsetBuffer(WTFMove(buffer));
}
static int readFunc(void* context, char* buffer, int len)
{
// Do 0-byte reads in case of a null descriptor
if (context == &globalDescriptor)
return 0;
OffsetBuffer* data = static_cast<OffsetBuffer*>(context);
return data->readOutBytes(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) {
OffsetBuffer* data = static_cast<OffsetBuffer*>(context);
delete data;
}
return 0;
}
#if ENABLE(XSLT)
static void errorFunc(void*, const char*, ...)
{
// FIXME: It would be nice to display error messages somewhere.
}
#endif
static void initializeXMLParser()
{
static std::once_flag flag;
std::call_once(flag, [&] {
xmlInitParser();
xmlRegisterInputCallbacks(matchFunc, openFunc, readFunc, closeFunc);
xmlRegisterOutputCallbacks(matchFunc, openFunc, writeFunc, closeFunc);
libxmlLoaderThread = &Thread::current();
});
}
Ref<XMLParserContext> XMLParserContext::createStringParser(xmlSAXHandlerPtr handlers, void* userData)
{
initializeXMLParser();
xmlParserCtxtPtr parser = xmlCreatePushParserCtxt(handlers, 0, 0, 0, 0);
parser->_private = userData;
// Substitute entities.
xmlCtxtUseOptions(parser, XML_PARSE_NOENT | XML_PARSE_HUGE);
switchToUTF16(parser);
return adoptRef(*new XMLParserContext(parser));
}
// Chunk should be encoded in UTF-8
RefPtr<XMLParserContext> XMLParserContext::createMemoryParser(xmlSAXHandlerPtr handlers, void* userData, const CString& chunk)
{
initializeXMLParser();
// appendFragmentSource() checks that the length doesn't overflow an int.
xmlParserCtxtPtr parser = xmlCreateMemoryParserCtxt(chunk.data(), chunk.length());
if (!parser)
return 0;
memcpy(parser->sax, handlers, sizeof(xmlSAXHandler));
// Substitute entities.
// FIXME: Why is XML_PARSE_NODICT needed? This is different from what createStringParser does.
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, reinterpret_cast<xmlChar*>(const_cast<char*>("xml")), 3);
parser->str_xmlns = xmlDictLookup(parser->dict, reinterpret_cast<xmlChar*>(const_cast<char*>("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_pendingCallbacks(makeUnique<PendingCallbacks>())
, m_currentNode(&document)
, m_scriptStartPosition(TextPosition::belowRangePosition())
{
}
XMLDocumentParser::XMLDocumentParser(DocumentFragment& fragment, HashMap<AtomString, AtomString>&& prefixToNamespaceMap, const AtomString& defaultNamespaceURI, ParserContentPolicy parserContentPolicy)
: ScriptableDocumentParser(fragment.document(), parserContentPolicy)
, m_pendingCallbacks(makeUnique<PendingCallbacks>())
, m_currentNode(&fragment)
, m_scriptStartPosition(TextPosition::belowRangePosition())
, m_parsingFragment(true)
, m_prefixToNamespaceMap(WTFMove(prefixToNamespaceMap))
, m_defaultNamespaceURI(defaultNamespaceURI)
{
fragment.ref();
}
XMLParserContext::~XMLParserContext()
{
if (m_context->myDoc)
xmlFreeDoc(m_context->myDoc);
xmlFreeParserCtxt(m_context);
}
XMLDocumentParser::~XMLDocumentParser()
{
// The XMLDocumentParser will always be detached before being destroyed.
ASSERT(m_currentNodeStack.isEmpty());
ASSERT(!m_currentNode);
// FIXME: m_pendingScript handling should be moved into XMLDocumentParser.cpp!
if (m_pendingScript)
m_pendingScript->clearClient();
}
void XMLDocumentParser::doWrite(const String& parseString)
{
ASSERT(!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()) {
// JavaScript may cause the parser to detach during xmlParseChunk
// keep this alive until this function is done.
Ref<XMLDocumentParser> protectedThis(*this);
XMLDocumentParserScope scope(&document()->cachedResourceLoader());
// FIXME: Can we parse 8-bit strings directly as Latin-1 instead of upconverting to UTF-16?
switchToUTF16(context->context());
xmlParseChunk(context->context(), reinterpret_cast<const char*>(StringView(parseString).upconvertedCharacters().get()), sizeof(UChar) * parseString.length(), 0);
// JavaScript (which may be run under the xmlParseChunk 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()->decoder() && document()->decoder()->sawError()) {
// 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::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 AtomString toAtomString(const xmlChar* string, size_t size)
{
return AtomString::fromUTF8(reinterpret_cast<const char*>(string), size);
}
static inline AtomString toAtomString(const xmlChar* string)
{
return AtomString::fromUTF8(reinterpret_cast<const char*>(string));
}
struct _xmlSAX2Namespace {
const xmlChar* prefix;
const xmlChar* uri;
};
typedef struct _xmlSAX2Namespace xmlSAX2Namespace;
static inline bool handleNamespaceAttributes(Vector<Attribute>& prefixedAttributes, const xmlChar** libxmlNamespaces, int numNamespaces)
{
xmlSAX2Namespace* namespaces = reinterpret_cast<xmlSAX2Namespace*>(libxmlNamespaces);
for (int i = 0; i < numNamespaces; i++) {
AtomString namespaceQName = xmlnsAtom();
AtomString namespaceURI = toAtomString(namespaces[i].uri);
if (namespaces[i].prefix)
namespaceQName = "xmlns:" + toString(namespaces[i].prefix);
auto result = Element::parseAttributeName(XMLNSNames::xmlnsNamespaceURI, namespaceQName);
if (result.hasException())
return false;
prefixedAttributes.append(Attribute(result.releaseReturnValue(), namespaceURI));
}
return true;
}
struct _xmlSAX2Attributes {
const xmlChar* localname;
const xmlChar* prefix;
const xmlChar* uri;
const xmlChar* value;
const xmlChar* end;
};
typedef struct _xmlSAX2Attributes xmlSAX2Attributes;
static inline bool handleElementAttributes(Vector<Attribute>& prefixedAttributes, const xmlChar** libxmlAttributes, int numAttributes)
{
xmlSAX2Attributes* attributes = reinterpret_cast<xmlSAX2Attributes*>(libxmlAttributes);
for (int i = 0; i < numAttributes; i++) {
int valueLength = static_cast<int>(attributes[i].end - attributes[i].value);
AtomString attrValue = toAtomString(attributes[i].value, valueLength);
String attrPrefix = toString(attributes[i].prefix);
AtomString attrURI = attrPrefix.isEmpty() ? nullAtom() : toAtomString(attributes[i].uri);
AtomString attrQName = attrPrefix.isEmpty() ? toAtomString(attributes[i].localname) : attrPrefix + ":" + toString(attributes[i].localname);
auto result = Element::parseAttributeName(attrURI, attrQName);
if (result.hasException())
return false;
prefixedAttributes.append(Attribute(result.releaseReturnValue(), attrValue));
}
return true;
}
// This is a hack around https://bugzilla.gnome.org/show_bug.cgi?id=502960
// Otherwise libxml doesn't include namespace for parsed entities, breaking entity
// expansion for all entities containing elements.
static inline bool hackAroundLibXMLEntityParsingBug()
{
#if LIBXML_VERSION >= 20704
// This bug has been fixed in libxml 2.7.4.
return false;
#else
return true;
#endif
}
void XMLDocumentParser::startElementNs(const xmlChar* xmlLocalName, const xmlChar* xmlPrefix, const xmlChar* xmlURI, int numNamespaces, const xmlChar** libxmlNamespaces, int numAttributes, int numDefaulted, const xmlChar** libxmlAttributes)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendStartElementNSCallback(xmlLocalName, xmlPrefix, xmlURI, numNamespaces, libxmlNamespaces, numAttributes, numDefaulted, libxmlAttributes);
return;
}
if (!updateLeafTextNode())
return;
AtomString localName = toAtomString(xmlLocalName);
AtomString uri = toAtomString(xmlURI);
AtomString prefix = toAtomString(xmlPrefix);
if (m_parsingFragment && uri.isNull()) {
if (!prefix.isNull())
uri = m_prefixToNamespaceMap.get(prefix);
else if (is<SVGElement>(m_currentNode) || localName == SVGNames::svgTag->localName())
uri = SVGNames::svgNamespaceURI;
else
uri = m_defaultNamespaceURI;
}
// If libxml entity parsing is broken, transfer the currentNodes' namespaceURI to the new node,
// if we're currently expanding elements which originate from an entity declaration.
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);
auto newElement = m_currentNode->document().createElement(qName, true);
Vector<Attribute> prefixedAttributes;
if (!handleNamespaceAttributes(prefixedAttributes, libxmlNamespaces, numNamespaces)) {
setAttributes(newElement.ptr(), prefixedAttributes, parserContentPolicy());
stopParsing();
return;
}
bool success = handleElementAttributes(prefixedAttributes, libxmlAttributes, numAttributes);
setAttributes(newElement.ptr(), prefixedAttributes, parserContentPolicy());
if (!success) {
stopParsing();
return;
}
newElement->beginParsingChildren();
if (isScriptElement(newElement.get()))
m_scriptStartPosition = textPosition();
m_currentNode->parserAppendChild(newElement);
if (!m_currentNode) // Synchronous DOM events may have removed the current node.
return;
if (is<HTMLTemplateElement>(newElement))
pushCurrentNode(&downcast<HTMLTemplateElement>(newElement.get()).content());
else
pushCurrentNode(newElement.ptr());
if (is<HTMLHtmlElement>(newElement))
downcast<HTMLHtmlElement>(newElement.get()).insertedByParser();
if (!m_parsingFragment && isFirstElement && document()->frame())
document()->frame()->injectUserScripts(UserScriptInjectionTime::DocumentStart);
}
void XMLDocumentParser::endElementNs()
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendEndElementNSCallback();
return;
}
// JavaScript can detach the parser. Make sure this is not released
// before the end of this method.
Ref<XMLDocumentParser> protectedThis(*this);
if (!updateLeafTextNode())
return;
RefPtr<ContainerNode> node = m_currentNode;
node->finishParsingChildren();
// Once we reach the depth again where entity expansion started, stop executing the work-around.
if (hackAroundLibXMLEntityParsingBug() && context()->depth <= depthTriggeringEntityExpansion())
setDepthTriggeringEntityExpansion(-1);
if (!scriptingContentIsAllowed(parserContentPolicy()) && is<Element>(*node) && isScriptElement(downcast<Element>(*node))) {
popCurrentNode();
node->remove();
return;
}
if (!node->isElementNode() || !m_view) {
popCurrentNode();
return;
}
auto& element = downcast<Element>(*node);
// 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;
}
if (!isScriptElement(element)) {
popCurrentNode();
return;
}
// Don't load external scripts for standalone documents (for now).
ASSERT(!m_pendingScript);
m_requestingScript = true;
auto& scriptElement = downcastScriptElement(element);
if (scriptElement.prepareScript(m_scriptStartPosition, ScriptElement::AllowLegacyTypeInTypeAttribute)) {
// FIXME: Script execution should be shared between
// the libxml2 and Qt XMLDocumentParser implementations.
if (scriptElement.readyToBeParserExecuted())
scriptElement.executeClassicScript(ScriptSourceCode(scriptElement.scriptContent(), URL(document()->url()), m_scriptStartPosition, JSC::SourceProviderSourceType::Program, InlineClassicScript::create(scriptElement)));
else if (scriptElement.willBeParserExecuted() && scriptElement.loadableScript()) {
m_pendingScript = PendingScript::create(scriptElement, *scriptElement.loadableScript());
m_pendingScript->setClient(*this);
// m_pendingScript will be nullptr if script was already loaded and setClient() executed it.
if (m_pendingScript)
pauseParsing();
}
// JavaScript may have detached the parser
if (isDetached())
return;
}
m_requestingScript = false;
popCurrentNode();
}
void XMLDocumentParser::characters(const xmlChar* characters, int length)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendCharactersCallback(characters, length);
return;
}
if (!m_leafTextNode)
createLeafTextNode();
m_bufferedText.append(characters, length);
}
void XMLDocumentParser::error(XMLErrors::ErrorType type, const char* message, va_list args)
{
if (isStopped())
return;
va_list preflightArgs;
va_copy(preflightArgs, args);
size_t stringLength = vsnprintf(nullptr, 0, message, preflightArgs);
va_end(preflightArgs);
Vector<char, 1024> buffer(stringLength + 1);
vsnprintf(buffer.data(), stringLength + 1, message, args);
TextPosition position = textPosition();
if (m_parserPaused)
m_pendingCallbacks->appendErrorCallback(type, reinterpret_cast<const xmlChar*>(buffer.data()), position.m_line, position.m_column);
else
handleError(type, buffer.data(), textPosition());
}
void XMLDocumentParser::processingInstruction(const xmlChar* target, const xmlChar* data)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendProcessingInstructionCallback(target, data);
return;
}
if (!updateLeafTextNode())
return;
auto result = m_currentNode->document().createProcessingInstruction(toString(target), toString(data));
if (result.hasException())
return;
auto pi = result.releaseReturnValue();
pi->setCreatedByParser(true);
m_currentNode->parserAppendChild(pi);
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;
}
if (!updateLeafTextNode())
return;
m_currentNode->parserAppendChild(CDATASection::create(m_currentNode->document(), toString(s, len)));
}
void XMLDocumentParser::comment(const xmlChar* s)
{
if (isStopped())
return;
if (m_parserPaused) {
m_pendingCallbacks->appendCommentCallback(s);
return;
}
if (!updateLeafTextNode())
return;
m_currentNode->parserAppendChild(Comment::create(m_currentNode->document(), toString(s)));
}
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));
if (standalone != StandaloneUnspecified)
document()->setXMLStandalone(standaloneInfo == StandaloneYes);
if (encoding)
document()->setXMLEncoding(toString(encoding));
document()->setHasXMLDeclaration(true);
}
void XMLDocumentParser::endDocument()
{
updateLeafTextNode();
}
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);
}
// This is a hack around http://bugzilla.gnome.org/show_bug.cgi?id=159219
// Otherwise libxml seems to call all the SAX callbacks twice for any replaced entity.
static inline bool hackAroundLibXMLEntityBug(void* closure)
{
#if LIBXML_VERSION >= 20627
// This bug has been fixed in libxml 2.6.27.
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 numNamespaces, const xmlChar** namespaces, int numAttributes, int numDefaulted, const xmlChar** libxmlAttributes)
{
if (hackAroundLibXMLEntityBug(closure))
return;
getParser(closure)->startElementNs(localname, prefix, uri, numNamespaces, namespaces, numAttributes, numDefaulted, 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);
}
// 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;
auto 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.
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)
{
// Prevent the next call to getEntityHandler() to record the entity expansion depth.
// We're parsing the entity declaration, so there's no need to record anything.
// We only need to record the depth, if we're actually expanding the entity, when it's referenced.
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()) {
// We're parsing the entity declarations (not an entity reference), no need to do anything special.
parser->setIsParsingEntityDeclaration(false);
ASSERT(parser->depthTriggeringEntityExpansion() == -1);
} else {
// The entity will be used and eventually expanded. Record the current parser depth
// so the next call to startElementNs() knows that the new element originates from
// an entity declaration.
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 == "-//W3C//DTD MathML 2.0//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); // controls if we replace entities or not.
}
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));
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) {
// Tell libxml we're done.
{
XMLDocumentParserScope scope(&document()->cachedResourceLoader());
xmlParseChunk(context(), 0, 0, 1);
}
m_context = nullptr;
}
}
#if ENABLE(XSLT)
bool xmlViewerMode = !m_sawError && !m_sawCSS && !m_sawXSLTransform && shouldRenderInXMLTreeViewerMode(*document());
if (xmlViewerMode) {
XMLTreeViewer xmlTreeViewer(*document());
xmlTreeViewer.transformDocumentToTreeView();
} else if (m_sawXSLTransform) {
xmlDocPtr doc = xmlDocPtrForString(document()->cachedResourceLoader(), m_originalSourceForTransform.toString(), document()->url().string());
document()->setTransformSource(makeUnique<TransformSource>(doc));
document()->setParsing(false); // Make the document think it's done, so it will apply XSL stylesheets.
document()->applyPendingXSLTransformsNowIfScheduled();
// styleResolverChanged() call can detach the parser and null out its document.
// In that case, we just bail out.
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";
}
xmlDocPtr xmlDocPtrForString(CachedResourceLoader& cachedResourceLoader, const String& source, const String& url)
{
if (source.isEmpty())
return nullptr;
// 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.
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();
return TextPosition(OrdinalNumber::fromOneBasedInt(context->input->line),
OrdinalNumber::fromOneBasedInt(context->input->col));
}
bool XMLDocumentParser::shouldAssociateConsoleMessagesWithTextPosition() const
{
return !m_parserPaused && !m_requestingScript;
}
void XMLDocumentParser::stopParsing()
{
if (m_sawError)
insertErrorMessageBlock();
DocumentParser::stopParsing();
if (context())
xmlStopParser(context());
}
void XMLDocumentParser::resumeParsing()
{
ASSERT(!isDetached());
ASSERT(m_parserPaused);
m_parserPaused = false;
// First, execute any pending callbacks
while (!m_pendingCallbacks->isEmpty()) {
m_pendingCallbacks->callAndRemoveFirstCallback(this);
// A callback paused the parser
if (m_parserPaused)
return;
}
// 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.
auto rest = m_pendingSrc.toString();
m_pendingSrc.clear();
append(rest.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)
{
ASSERT(!m_context);
ASSERT(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;
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 || ((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 ASSERT, we've found a test case which demonstrates the need for this code.
ASSERT(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());
}
// --------------------------------
using AttributeParseState = Optional<HashMap<String, String>>;
static void attributesStartElementNsHandler(void* closure, const xmlChar* xmlLocalName, const xmlChar* /*xmlPrefix*/, const xmlChar* /*xmlURI*/, int /*numNamespaces*/, const xmlChar** /*namespaces*/, int numAttributes, int /*numDefaulted*/, const xmlChar** libxmlAttributes)
{
if (strcmp(reinterpret_cast<const char*>(xmlLocalName), "attrs") != 0)
return;
auto& state = *static_cast<AttributeParseState*>(static_cast<xmlParserCtxtPtr>(closure)->_private);
state = HashMap<String, String> { };
xmlSAX2Attributes* attributes = reinterpret_cast<xmlSAX2Attributes*>(libxmlAttributes);
for (int i = 0; i < numAttributes; 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->set(attrQName, attrValue);
}
}
Optional<HashMap<String, String>> parseAttributes(const String& string)
{
String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
AttributeParseState attributes;
xmlSAXHandler sax;
memset(&sax, 0, sizeof(sax));
sax.startElementNs = attributesStartElementNsHandler;
sax.initialized = XML_SAX2_MAGIC;
auto parser = XMLParserContext::createStringParser(&sax, &attributes);
// FIXME: Can we parse 8-bit strings directly as Latin-1 instead of upconverting to UTF-16?
xmlParseChunk(parser->context(), reinterpret_cast<const char*>(StringView(parseString).upconvertedCharacters().get()), parseString.length() * sizeof(UChar), 1);
return attributes;
}
}