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nsRDFContentSink.cpp
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nsRDFContentSink.cpp
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
An implementation for an NGLayout-style content sink that knows how
to build an RDF content model from XML-serialized RDF.
For more information on the RDF/XML syntax,
see http://www.w3.org/TR/REC-rdf-syntax/
This code is based on the final W3C Recommendation,
http://www.w3.org/TR/1999/REC-rdf-syntax-19990222.
Open Issues ------------------
1) factoring code with nsXMLContentSink - There's some amount of
common code between this and the HTML content sink. This will
increase as we support more and more HTML elements. How can code
from XML/HTML be factored?
2) We don't support the `parseType' attribute on the Description
tag; therefore, it is impossible to "inline" raw XML in this
implemenation.
3) We don't build the reifications at parse time due to the
footprint overhead it would incur for large RDF documents. (It
may be possible to attach a "reification" wrapper datasource that
would present this information at query-time.) Because of this,
the `bagID' attribute is not processed correctly.
4) No attempt is made to `resolve URIs' to a canonical form (the
specification hints that an implementation should do this). This
is omitted for the obvious reason that we can ill afford to
resolve each URI reference.
*/
#include "mozilla/Util.h"
#include "nsCOMPtr.h"
#include "nsInterfaceHashtable.h"
#include "nsIContentSink.h"
#include "nsIRDFContainer.h"
#include "nsIRDFContainerUtils.h"
#include "nsIRDFContentSink.h"
#include "nsIRDFNode.h"
#include "nsIRDFService.h"
#include "nsIRDFXMLSink.h"
#include "nsIServiceManager.h"
#include "nsIURL.h"
#include "nsIXMLContentSink.h"
#include "nsRDFCID.h"
#include "nsTArray.h"
#include "nsXPIDLString.h"
#include "prlog.h"
#include "prmem.h"
#include "rdf.h"
#include "rdfutil.h"
#include "nsReadableUtils.h"
#include "nsIExpatSink.h"
#include "nsCRT.h"
#include "nsIAtom.h"
#include "nsStaticAtom.h"
#include "nsIScriptError.h"
#include "nsIDTD.h"
using namespace mozilla;
////////////////////////////////////////////////////////////////////////
// XPCOM IIDs
static NS_DEFINE_IID(kIContentSinkIID, NS_ICONTENT_SINK_IID); // XXX grr...
static NS_DEFINE_IID(kIExpatSinkIID, NS_IEXPATSINK_IID);
static NS_DEFINE_IID(kIRDFServiceIID, NS_IRDFSERVICE_IID);
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kIXMLContentSinkIID, NS_IXMLCONTENT_SINK_IID);
static NS_DEFINE_IID(kIRDFContentSinkIID, NS_IRDFCONTENTSINK_IID);
static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
static NS_DEFINE_CID(kRDFContainerUtilsCID, NS_RDFCONTAINERUTILS_CID);
////////////////////////////////////////////////////////////////////////
#ifdef PR_LOGGING
static PRLogModuleInfo* gLog;
#endif
///////////////////////////////////////////////////////////////////////
enum RDFContentSinkState {
eRDFContentSinkState_InProlog,
eRDFContentSinkState_InDocumentElement,
eRDFContentSinkState_InDescriptionElement,
eRDFContentSinkState_InContainerElement,
eRDFContentSinkState_InPropertyElement,
eRDFContentSinkState_InMemberElement,
eRDFContentSinkState_InEpilog
};
enum RDFContentSinkParseMode {
eRDFContentSinkParseMode_Resource,
eRDFContentSinkParseMode_Literal,
eRDFContentSinkParseMode_Int,
eRDFContentSinkParseMode_Date
};
typedef
NS_STDCALL_FUNCPROTO(nsresult,
nsContainerTestFn,
nsIRDFContainerUtils, IsAlt,
(nsIRDFDataSource*, nsIRDFResource*, bool*));
typedef
NS_STDCALL_FUNCPROTO(nsresult,
nsMakeContainerFn,
nsIRDFContainerUtils, MakeAlt,
(nsIRDFDataSource*, nsIRDFResource*, nsIRDFContainer**));
class RDFContentSinkImpl : public nsIRDFContentSink,
public nsIExpatSink
{
public:
RDFContentSinkImpl();
virtual ~RDFContentSinkImpl();
// nsISupports
NS_DECL_ISUPPORTS
NS_DECL_NSIEXPATSINK
// nsIContentSink
NS_IMETHOD WillParse(void);
NS_IMETHOD WillBuildModel(nsDTDMode aDTDMode);
NS_IMETHOD DidBuildModel(bool aTerminated);
NS_IMETHOD WillInterrupt(void);
NS_IMETHOD WillResume(void);
NS_IMETHOD SetParser(nsParserBase* aParser);
virtual void FlushPendingNotifications(mozFlushType aType) { }
NS_IMETHOD SetDocumentCharset(nsACString& aCharset) { return NS_OK; }
virtual nsISupports *GetTarget() { return nsnull; }
// nsIRDFContentSink
NS_IMETHOD Init(nsIURI* aURL);
NS_IMETHOD SetDataSource(nsIRDFDataSource* aDataSource);
NS_IMETHOD GetDataSource(nsIRDFDataSource*& aDataSource);
// pseudo constants
static PRInt32 gRefCnt;
static nsIRDFService* gRDFService;
static nsIRDFContainerUtils* gRDFContainerUtils;
static nsIRDFResource* kRDF_type;
static nsIRDFResource* kRDF_instanceOf; // XXX should be RDF:type
static nsIRDFResource* kRDF_Alt;
static nsIRDFResource* kRDF_Bag;
static nsIRDFResource* kRDF_Seq;
static nsIRDFResource* kRDF_nextVal;
#define RDF_ATOM(name_, value_) static nsIAtom* name_;
#include "nsRDFContentSinkAtomList.h"
#undef RDF_ATOM
typedef struct ContainerInfo {
nsIRDFResource** mType;
nsContainerTestFn mTestFn;
nsMakeContainerFn mMakeFn;
} ContainerInfo;
protected:
// Text management
void ParseText(nsIRDFNode **aResult);
nsresult FlushText();
nsresult AddText(const PRUnichar* aText, PRInt32 aLength);
// RDF-specific parsing
nsresult OpenRDF(const PRUnichar* aName);
nsresult OpenObject(const PRUnichar* aName ,const PRUnichar** aAttributes);
nsresult OpenProperty(const PRUnichar* aName, const PRUnichar** aAttributes);
nsresult OpenMember(const PRUnichar* aName, const PRUnichar** aAttributes);
nsresult OpenValue(const PRUnichar* aName, const PRUnichar** aAttributes);
nsresult GetIdAboutAttribute(const PRUnichar** aAttributes, nsIRDFResource** aResource, bool* aIsAnonymous = nsnull);
nsresult GetResourceAttribute(const PRUnichar** aAttributes, nsIRDFResource** aResource);
nsresult AddProperties(const PRUnichar** aAttributes, nsIRDFResource* aSubject, PRInt32* aCount = nsnull);
void SetParseMode(const PRUnichar **aAttributes);
PRUnichar* mText;
PRInt32 mTextLength;
PRInt32 mTextSize;
/**
* From the set of given attributes, this method extracts the
* namespace definitions and feeds them to the datasource.
* These can then be suggested to the serializer to be used again.
* Hopefully, this will keep namespace definitions intact in a
* parse - serialize cycle.
*/
void RegisterNamespaces(const PRUnichar **aAttributes);
/**
* Extracts the localname from aExpatName, the name that the Expat parser
* passes us.
* aLocalName will contain the localname in aExpatName.
* The return value is a dependent string containing just the namespace.
*/
const nsDependentSubstring SplitExpatName(const PRUnichar *aExpatName,
nsIAtom **aLocalName);
enum eContainerType { eBag, eSeq, eAlt };
nsresult InitContainer(nsIRDFResource* aContainerType, nsIRDFResource* aContainer);
nsresult ReinitContainer(nsIRDFResource* aContainerType, nsIRDFResource* aContainer);
// The datasource in which we're assigning assertions
nsCOMPtr<nsIRDFDataSource> mDataSource;
// A hash of all the node IDs referred to
nsInterfaceHashtable<nsStringHashKey, nsIRDFResource> mNodeIDMap;
// The current state of the content sink
RDFContentSinkState mState;
RDFContentSinkParseMode mParseMode;
// content stack management
PRInt32
PushContext(nsIRDFResource *aContext,
RDFContentSinkState aState,
RDFContentSinkParseMode aParseMode);
nsresult
PopContext(nsIRDFResource *&aContext,
RDFContentSinkState &aState,
RDFContentSinkParseMode &aParseMode);
nsIRDFResource* GetContextElement(PRInt32 ancestor = 0);
struct RDFContextStackElement {
nsCOMPtr<nsIRDFResource> mResource;
RDFContentSinkState mState;
RDFContentSinkParseMode mParseMode;
};
nsAutoTArray<RDFContextStackElement, 8>* mContextStack;
nsIURI* mDocumentURL;
};
PRInt32 RDFContentSinkImpl::gRefCnt = 0;
nsIRDFService* RDFContentSinkImpl::gRDFService;
nsIRDFContainerUtils* RDFContentSinkImpl::gRDFContainerUtils;
nsIRDFResource* RDFContentSinkImpl::kRDF_type;
nsIRDFResource* RDFContentSinkImpl::kRDF_instanceOf;
nsIRDFResource* RDFContentSinkImpl::kRDF_Alt;
nsIRDFResource* RDFContentSinkImpl::kRDF_Bag;
nsIRDFResource* RDFContentSinkImpl::kRDF_Seq;
nsIRDFResource* RDFContentSinkImpl::kRDF_nextVal;
////////////////////////////////////////////////////////////////////////
#define RDF_ATOM(name_, value_) nsIAtom* RDFContentSinkImpl::name_;
#include "nsRDFContentSinkAtomList.h"
#undef RDF_ATOM
#define RDF_ATOM(name_, value_) NS_STATIC_ATOM_BUFFER(name_##_buffer, value_)
#include "nsRDFContentSinkAtomList.h"
#undef RDF_ATOM
static const nsStaticAtom rdf_atoms[] = {
#define RDF_ATOM(name_, value_) NS_STATIC_ATOM(name_##_buffer, &RDFContentSinkImpl::name_),
#include "nsRDFContentSinkAtomList.h"
#undef RDF_ATOM
};
RDFContentSinkImpl::RDFContentSinkImpl()
: mText(nsnull),
mTextLength(0),
mTextSize(0),
mState(eRDFContentSinkState_InProlog),
mParseMode(eRDFContentSinkParseMode_Literal),
mContextStack(nsnull),
mDocumentURL(nsnull)
{
if (gRefCnt++ == 0) {
nsresult rv = CallGetService(kRDFServiceCID, &gRDFService);
NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get RDF service");
if (NS_SUCCEEDED(rv)) {
rv = gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "type"),
&kRDF_type);
rv = gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "instanceOf"),
&kRDF_instanceOf);
rv = gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Alt"),
&kRDF_Alt);
rv = gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Bag"),
&kRDF_Bag);
rv = gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Seq"),
&kRDF_Seq);
rv = gRDFService->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "nextVal"),
&kRDF_nextVal);
}
rv = CallGetService(kRDFContainerUtilsCID, &gRDFContainerUtils);
NS_RegisterStaticAtoms(rdf_atoms);
}
mNodeIDMap.Init();
#ifdef PR_LOGGING
if (! gLog)
gLog = PR_NewLogModule("nsRDFContentSink");
#endif
}
RDFContentSinkImpl::~RDFContentSinkImpl()
{
#ifdef DEBUG_REFS
--gInstanceCount;
fprintf(stdout, "%d - RDF: RDFContentSinkImpl\n", gInstanceCount);
#endif
NS_IF_RELEASE(mDocumentURL);
if (mContextStack) {
PR_LOG(gLog, PR_LOG_WARNING,
("rdfxml: warning! unclosed tag"));
// XXX we should never need to do this, but, we'll write the
// code all the same. If someone left the content stack dirty,
// pop all the elements off the stack and release them.
PRInt32 i = mContextStack->Length();
while (0 < i--) {
nsIRDFResource* resource = nsnull;
RDFContentSinkState state;
RDFContentSinkParseMode parseMode;
PopContext(resource, state, parseMode);
#ifdef PR_LOGGING
// print some fairly useless debugging info
// XXX we should save line numbers on the context stack: this'd
// be about 1000x more helpful.
if (resource) {
nsXPIDLCString uri;
resource->GetValue(getter_Copies(uri));
PR_LOG(gLog, PR_LOG_NOTICE,
("rdfxml: uri=%s", (const char*) uri));
}
#endif
NS_IF_RELEASE(resource);
}
delete mContextStack;
}
PR_FREEIF(mText);
if (--gRefCnt == 0) {
NS_IF_RELEASE(gRDFService);
NS_IF_RELEASE(gRDFContainerUtils);
NS_IF_RELEASE(kRDF_type);
NS_IF_RELEASE(kRDF_instanceOf);
NS_IF_RELEASE(kRDF_Alt);
NS_IF_RELEASE(kRDF_Bag);
NS_IF_RELEASE(kRDF_Seq);
NS_IF_RELEASE(kRDF_nextVal);
}
}
////////////////////////////////////////////////////////////////////////
// nsISupports interface
NS_IMPL_ADDREF(RDFContentSinkImpl)
NS_IMPL_RELEASE(RDFContentSinkImpl)
NS_IMETHODIMP
RDFContentSinkImpl::QueryInterface(REFNSIID iid, void** result)
{
NS_PRECONDITION(result, "null ptr");
if (! result)
return NS_ERROR_NULL_POINTER;
*result = nsnull;
if (iid.Equals(kIRDFContentSinkIID) ||
iid.Equals(kIXMLContentSinkIID) ||
iid.Equals(kIContentSinkIID) ||
iid.Equals(kISupportsIID)) {
*result = static_cast<nsIXMLContentSink*>(this);
AddRef();
return NS_OK;
}
else if (iid.Equals(kIExpatSinkIID)) {
*result = static_cast<nsIExpatSink*>(this);
AddRef();
return NS_OK;
}
return NS_NOINTERFACE;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleStartElement(const PRUnichar *aName,
const PRUnichar **aAtts,
PRUint32 aAttsCount,
PRInt32 aIndex,
PRUint32 aLineNumber)
{
FlushText();
nsresult rv = NS_ERROR_UNEXPECTED; // XXX
RegisterNamespaces(aAtts);
switch (mState) {
case eRDFContentSinkState_InProlog:
rv = OpenRDF(aName);
break;
case eRDFContentSinkState_InDocumentElement:
rv = OpenObject(aName,aAtts);
break;
case eRDFContentSinkState_InDescriptionElement:
rv = OpenProperty(aName,aAtts);
break;
case eRDFContentSinkState_InContainerElement:
rv = OpenMember(aName,aAtts);
break;
case eRDFContentSinkState_InPropertyElement:
case eRDFContentSinkState_InMemberElement:
rv = OpenValue(aName,aAtts);
break;
case eRDFContentSinkState_InEpilog:
PR_LOG(gLog, PR_LOG_WARNING,
("rdfxml: unexpected content in epilog at line %d",
aLineNumber));
break;
}
return rv;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleEndElement(const PRUnichar *aName)
{
FlushText();
nsIRDFResource* resource;
if (NS_FAILED(PopContext(resource, mState, mParseMode))) {
// XXX parser didn't catch unmatched tags?
#ifdef PR_LOGGING
if (PR_LOG_TEST(gLog, PR_LOG_WARNING)) {
nsAutoString tagStr(aName);
char* tagCStr = ToNewCString(tagStr);
PR_LogPrint
("rdfxml: extra close tag '%s' at line %d",
tagCStr, 0/*XXX fix me */);
NS_Free(tagCStr);
}
#endif
return NS_ERROR_UNEXPECTED; // XXX
}
// If we've just popped a member or property element, _now_ is the
// time to add that element to the graph.
switch (mState) {
case eRDFContentSinkState_InMemberElement:
{
nsCOMPtr<nsIRDFContainer> container;
NS_NewRDFContainer(getter_AddRefs(container));
container->Init(mDataSource, GetContextElement(1));
container->AppendElement(resource);
}
break;
case eRDFContentSinkState_InPropertyElement:
{
mDataSource->Assert(GetContextElement(1), GetContextElement(0), resource, true);
} break;
default:
break;
}
if (mContextStack->IsEmpty())
mState = eRDFContentSinkState_InEpilog;
NS_IF_RELEASE(resource);
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleComment(const PRUnichar *aName)
{
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleCDataSection(const PRUnichar *aData,
PRUint32 aLength)
{
return aData ? AddText(aData, aLength) : NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleDoctypeDecl(const nsAString & aSubset,
const nsAString & aName,
const nsAString & aSystemId,
const nsAString & aPublicId,
nsISupports* aCatalogData)
{
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleCharacterData(const PRUnichar *aData,
PRUint32 aLength)
{
return aData ? AddText(aData, aLength) : NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleProcessingInstruction(const PRUnichar *aTarget,
const PRUnichar *aData)
{
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::HandleXMLDeclaration(const PRUnichar *aVersion,
const PRUnichar *aEncoding,
PRInt32 aStandalone)
{
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::ReportError(const PRUnichar* aErrorText,
const PRUnichar* aSourceText,
nsIScriptError *aError,
bool *_retval)
{
NS_PRECONDITION(aError && aSourceText && aErrorText, "Check arguments!!!");
// The expat driver should report the error.
*_retval = true;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////
// nsIContentSink interface
NS_IMETHODIMP
RDFContentSinkImpl::WillParse(void)
{
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::WillBuildModel(nsDTDMode)
{
if (mDataSource) {
nsCOMPtr<nsIRDFXMLSink> sink = do_QueryInterface(mDataSource);
if (sink)
return sink->BeginLoad();
}
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::DidBuildModel(bool aTerminated)
{
if (mDataSource) {
nsCOMPtr<nsIRDFXMLSink> sink = do_QueryInterface(mDataSource);
if (sink)
return sink->EndLoad();
}
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::WillInterrupt(void)
{
if (mDataSource) {
nsCOMPtr<nsIRDFXMLSink> sink = do_QueryInterface(mDataSource);
if (sink)
return sink->Interrupt();
}
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::WillResume(void)
{
if (mDataSource) {
nsCOMPtr<nsIRDFXMLSink> sink = do_QueryInterface(mDataSource);
if (sink)
return sink->Resume();
}
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::SetParser(nsParserBase* aParser)
{
return NS_OK;
}
////////////////////////////////////////////////////////////////////////
// nsIRDFContentSink interface
NS_IMETHODIMP
RDFContentSinkImpl::Init(nsIURI* aURL)
{
NS_PRECONDITION(aURL != nsnull, "null ptr");
if (! aURL)
return NS_ERROR_NULL_POINTER;
mDocumentURL = aURL;
NS_ADDREF(aURL);
mState = eRDFContentSinkState_InProlog;
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::SetDataSource(nsIRDFDataSource* aDataSource)
{
NS_PRECONDITION(aDataSource != nsnull, "SetDataSource null ptr");
mDataSource = aDataSource;
NS_ASSERTION(mDataSource != nsnull,"Couldn't QI RDF DataSource");
return NS_OK;
}
NS_IMETHODIMP
RDFContentSinkImpl::GetDataSource(nsIRDFDataSource*& aDataSource)
{
aDataSource = mDataSource;
NS_IF_ADDREF(aDataSource);
return NS_OK;
}
////////////////////////////////////////////////////////////////////////
// Text buffering
static bool
rdf_IsDataInBuffer(PRUnichar* buffer, PRInt32 length)
{
for (PRInt32 i = 0; i < length; ++i) {
if (buffer[i] == ' ' ||
buffer[i] == '\t' ||
buffer[i] == '\n' ||
buffer[i] == '\r')
continue;
return true;
}
return false;
}
void
RDFContentSinkImpl::ParseText(nsIRDFNode **aResult)
{
// XXXwaterson wasteful, but we'd need to make a copy anyway to be
// able to call nsIRDFService::Get[Resource|Literal|...]().
nsAutoString value;
value.Append(mText, mTextLength);
value.Trim(" \t\n\r");
switch (mParseMode) {
case eRDFContentSinkParseMode_Literal:
{
nsIRDFLiteral *result;
gRDFService->GetLiteral(value.get(), &result);
*aResult = result;
}
break;
case eRDFContentSinkParseMode_Resource:
{
nsIRDFResource *result;
gRDFService->GetUnicodeResource(value, &result);
*aResult = result;
}
break;
case eRDFContentSinkParseMode_Int:
{
PRInt32 i, err;
i = value.ToInteger(&err);
nsIRDFInt *result;
gRDFService->GetIntLiteral(i, &result);
*aResult = result;
}
break;
case eRDFContentSinkParseMode_Date:
{
PRTime t = rdf_ParseDate(nsDependentCString(NS_LossyConvertUTF16toASCII(value).get(), value.Length()));
nsIRDFDate *result;
gRDFService->GetDateLiteral(t, &result);
*aResult = result;
}
break;
default:
NS_NOTREACHED("unknown parse type");
break;
}
}
nsresult
RDFContentSinkImpl::FlushText()
{
nsresult rv = NS_OK;
if (0 != mTextLength) {
if (rdf_IsDataInBuffer(mText, mTextLength)) {
// XXX if there's anything but whitespace, then we'll
// create a text node.
switch (mState) {
case eRDFContentSinkState_InMemberElement: {
nsCOMPtr<nsIRDFNode> node;
ParseText(getter_AddRefs(node));
nsCOMPtr<nsIRDFContainer> container;
NS_NewRDFContainer(getter_AddRefs(container));
container->Init(mDataSource, GetContextElement(1));
container->AppendElement(node);
} break;
case eRDFContentSinkState_InPropertyElement: {
nsCOMPtr<nsIRDFNode> node;
ParseText(getter_AddRefs(node));
mDataSource->Assert(GetContextElement(1), GetContextElement(0), node, true);
} break;
default:
// just ignore it
break;
}
}
mTextLength = 0;
}
return rv;
}
nsresult
RDFContentSinkImpl::AddText(const PRUnichar* aText, PRInt32 aLength)
{
// Create buffer when we first need it
if (0 == mTextSize) {
mText = (PRUnichar *) PR_MALLOC(sizeof(PRUnichar) * 4096);
if (!mText) {
return NS_ERROR_OUT_OF_MEMORY;
}
mTextSize = 4096;
}
// Copy data from string into our buffer; grow the buffer as needed.
// It never shrinks, but since the content sink doesn't stick around,
// this shouldn't be a bloat issue.
PRInt32 amount = mTextSize - mTextLength;
if (amount < aLength) {
// Grow the buffer by at least a factor of two to prevent thrashing.
// Since PR_REALLOC will leave mText intact if the call fails,
// don't clobber mText or mTextSize until the new mem is allocated.
PRInt32 newSize = (2 * mTextSize > (mTextSize + aLength)) ?
(2 * mTextSize) : (mTextSize + aLength);
PRUnichar* newText =
(PRUnichar *) PR_REALLOC(mText, sizeof(PRUnichar) * newSize);
if (!newText)
return NS_ERROR_OUT_OF_MEMORY;
mTextSize = newSize;
mText = newText;
}
memcpy(&mText[mTextLength], aText, sizeof(PRUnichar) * aLength);
mTextLength += aLength;
return NS_OK;
}
bool
rdf_RequiresAbsoluteURI(const nsString& uri)
{
// cheap shot at figuring out if this requires an absolute url translation
return !(StringBeginsWith(uri, NS_LITERAL_STRING("urn:")) ||
StringBeginsWith(uri, NS_LITERAL_STRING("chrome:")));
}
nsresult
RDFContentSinkImpl::GetIdAboutAttribute(const PRUnichar** aAttributes,
nsIRDFResource** aResource,
bool* aIsAnonymous)
{
// This corresponds to the dirty work of production [6.5]
nsresult rv = NS_OK;
nsAutoString nodeID;
nsCOMPtr<nsIAtom> localName;
for (; *aAttributes; aAttributes += 2) {
const nsDependentSubstring& nameSpaceURI =
SplitExpatName(aAttributes[0], getter_AddRefs(localName));
// We'll accept either `ID' or `rdf:ID' (ibid with `about' or
// `rdf:about') in the spirit of being liberal towards the
// input that we receive.
if (!nameSpaceURI.IsEmpty() &&
!nameSpaceURI.EqualsLiteral(RDF_NAMESPACE_URI)) {
continue;
}
// XXX you can't specify both, but we'll just pick up the
// first thing that was specified and ignore the other.
if (localName == kAboutAtom) {
if (aIsAnonymous)
*aIsAnonymous = false;
nsAutoString relURI(aAttributes[1]);
if (rdf_RequiresAbsoluteURI(relURI)) {
nsCAutoString uri;
rv = mDocumentURL->Resolve(NS_ConvertUTF16toUTF8(aAttributes[1]), uri);
if (NS_FAILED(rv)) return rv;
return gRDFService->GetResource(uri,
aResource);
}
return gRDFService->GetResource(NS_ConvertUTF16toUTF8(aAttributes[1]),
aResource);
}
else if (localName == kIdAtom) {
if (aIsAnonymous)
*aIsAnonymous = false;
// In the spirit of leniency, we do not bother trying to
// enforce that this be a valid "XML Name" (see
// http://www.w3.org/TR/REC-xml#NT-Nmtoken), as per
// 6.21. If we wanted to, this would be where to do it.
// Construct an in-line resource whose URI is the
// document's URI plus the XML name specified in the ID
// attribute.
nsCAutoString name;
nsCAutoString ref('#');
AppendUTF16toUTF8(aAttributes[1], ref);
rv = mDocumentURL->Resolve(ref, name);
if (NS_FAILED(rv)) return rv;
return gRDFService->GetResource(name, aResource);
}
else if (localName == kNodeIdAtom) {
nodeID.Assign(aAttributes[1]);
}
else if (localName == kAboutEachAtom) {
// XXX we don't deal with aboutEach...
//PR_LOG(gLog, PR_LOG_WARNING,
// ("rdfxml: ignoring aboutEach at line %d",
// aNode.GetSourceLineNumber()));
}
}
// Otherwise, we couldn't find anything, so just gensym one...
if (aIsAnonymous)
*aIsAnonymous = true;
// If nodeID is present, check if we already know about it. If we've seen
// the nodeID before, use the same resource, otherwise generate a new one.
if (!nodeID.IsEmpty()) {
mNodeIDMap.Get(nodeID,aResource);
if (!*aResource) {
rv = gRDFService->GetAnonymousResource(aResource);
mNodeIDMap.Put(nodeID,*aResource);
}
}
else {
rv = gRDFService->GetAnonymousResource(aResource);
}
return rv;
}
nsresult
RDFContentSinkImpl::GetResourceAttribute(const PRUnichar** aAttributes,
nsIRDFResource** aResource)
{
nsCOMPtr<nsIAtom> localName;
nsAutoString nodeID;
for (; *aAttributes; aAttributes += 2) {
const nsDependentSubstring& nameSpaceURI =
SplitExpatName(aAttributes[0], getter_AddRefs(localName));
// We'll accept `resource' or `rdf:resource', under the spirit
// that we should be liberal towards the input that we
// receive.
if (!nameSpaceURI.IsEmpty() &&
!nameSpaceURI.EqualsLiteral(RDF_NAMESPACE_URI)) {
continue;
}
// XXX you can't specify both, but we'll just pick up the
// first thing that was specified and ignore the other.
if (localName == kResourceAtom) {
// XXX Take the URI and make it fully qualified by
// sticking it into the document's URL. This may not be
// appropriate...
nsAutoString relURI(aAttributes[1]);
if (rdf_RequiresAbsoluteURI(relURI)) {
nsresult rv;
nsCAutoString uri;
rv = mDocumentURL->Resolve(NS_ConvertUTF16toUTF8(aAttributes[1]), uri);
if (NS_FAILED(rv)) return rv;
return gRDFService->GetResource(uri, aResource);
}
return gRDFService->GetResource(NS_ConvertUTF16toUTF8(aAttributes[1]),
aResource);
}
else if (localName == kNodeIdAtom) {
nodeID.Assign(aAttributes[1]);
}
}
// If nodeID is present, check if we already know about it. If we've seen
// the nodeID before, use the same resource, otherwise generate a new one.
if (!nodeID.IsEmpty()) {
mNodeIDMap.Get(nodeID,aResource);
if (!*aResource) {
nsresult rv;
rv = gRDFService->GetAnonymousResource(aResource);
if (NS_FAILED(rv)) {
return rv;
}
mNodeIDMap.Put(nodeID,*aResource);
}
return NS_OK;
}
return NS_ERROR_FAILURE;
}
nsresult
RDFContentSinkImpl::AddProperties(const PRUnichar** aAttributes,
nsIRDFResource* aSubject,
PRInt32* aCount)
{
if (aCount)
*aCount = 0;
nsCOMPtr<nsIAtom> localName;
for (; *aAttributes; aAttributes += 2) {
const nsDependentSubstring& nameSpaceURI =
SplitExpatName(aAttributes[0], getter_AddRefs(localName));
// skip 'xmlns' directives, these are "meta" information
if (nameSpaceURI.EqualsLiteral("http://www.w3.org/2000/xmlns/")) {
continue;
}
// skip `about', `ID', `resource', and 'nodeID' attributes (either with or
// without the `rdf:' prefix); these are all "special" and
// should've been dealt with by the caller.
if (localName == kAboutAtom || localName == kIdAtom ||
localName == kResourceAtom || localName == kNodeIdAtom) {
if (nameSpaceURI.IsEmpty() ||
nameSpaceURI.EqualsLiteral(RDF_NAMESPACE_URI))
continue;
}
// Skip `parseType', `RDF:parseType', and `NC:parseType'. This
// is meta-information that will be handled in SetParseMode.
if (localName == kParseTypeAtom) {
if (nameSpaceURI.IsEmpty() ||
nameSpaceURI.EqualsLiteral(RDF_NAMESPACE_URI) ||
nameSpaceURI.EqualsLiteral(NC_NAMESPACE_URI)) {
continue;
}
}
NS_ConvertUTF16toUTF8 propertyStr(nameSpaceURI);