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d381b4bca6
gecko-dev/rdf/base/nsRDFXMLSerializer.cpp
Phil Ringnalda d381b4bca6 Back out 7 changesets (bug 1235261) for cpptest failures in TestTArray 
CLOSED TREE

Backed out changeset d66c3f19a210 (bug 1235261)
Backed out changeset 467d945426bb (bug 1235261)
Backed out changeset 32b61df13142 (bug 1235261)
Backed out changeset c50bb8ed4196 (bug 1235261)
Backed out changeset 0ff0fa6fe81f (bug 1235261)
Backed out changeset df70e89669da (bug 1235261)
Backed out changeset 064969357fc9 (bug 1235261)
2016-01-31 10:10:57 -08:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=80:
*
* 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/. */
#include "nsRDFXMLSerializer.h"
#include "nsIAtom.h"
#include "nsIOutputStream.h"
#include "nsIRDFService.h"
#include "nsIRDFContainerUtils.h"
#include "nsIServiceManager.h"
#include "nsString.h"
#include "nsXPIDLString.h"
#include "nsTArray.h"
#include "rdf.h"
#include "rdfutil.h"
#include "mozilla/Attributes.h"
#include "rdfIDataSource.h"
int32_t nsRDFXMLSerializer::gRefCnt = 0;
nsIRDFContainerUtils* nsRDFXMLSerializer::gRDFC;
nsIRDFResource* nsRDFXMLSerializer::kRDF_instanceOf;
nsIRDFResource* nsRDFXMLSerializer::kRDF_type;
nsIRDFResource* nsRDFXMLSerializer::kRDF_nextVal;
nsIRDFResource* nsRDFXMLSerializer::kRDF_Bag;
nsIRDFResource* nsRDFXMLSerializer::kRDF_Seq;
nsIRDFResource* nsRDFXMLSerializer::kRDF_Alt;
static const char kRDFDescriptionOpen[] = " <RDF:Description";
static const char kIDAttr[] = " RDF:ID=\"";
static const char kAboutAttr[] = " RDF:about=\"";
static const char kRDFDescriptionClose[] = " </RDF:Description>\n";
static const char kRDFResource1[] = " RDF:resource=\"";
static const char kRDFResource2[] = "\"/>\n";
static const char kRDFParseTypeInteger[] = " NC:parseType=\"Integer\">";
static const char kRDFParseTypeDate[] = " NC:parseType=\"Date\">";
static const char kRDFUnknown[] = "><!-- unknown node type -->";
nsresult
nsRDFXMLSerializer::Create(nsISupports* aOuter, REFNSIID aIID, void** aResult)
{
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
nsCOMPtr<nsIRDFXMLSerializer> result = new nsRDFXMLSerializer();
if (! result)
return NS_ERROR_OUT_OF_MEMORY;
// The serializer object is here, addref gRefCnt so that the
// destructor can safely release it.
gRefCnt++;
nsresult rv;
rv = result->QueryInterface(aIID, aResult);
if (NS_FAILED(rv)) return rv;
if (gRefCnt == 1) do {
nsCOMPtr<nsIRDFService> rdf = do_GetService("@mozilla.org/rdf/rdf-service;1", &rv);
if (NS_FAILED(rv)) break;
rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "instanceOf"),
&kRDF_instanceOf);
if (NS_FAILED(rv)) break;
rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "type"),
&kRDF_type);
if (NS_FAILED(rv)) break;
rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "nextVal"),
&kRDF_nextVal);
if (NS_FAILED(rv)) break;
rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Bag"),
&kRDF_Bag);
if (NS_FAILED(rv)) break;
rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Seq"),
&kRDF_Seq);
if (NS_FAILED(rv)) break;
rv = rdf->GetResource(NS_LITERAL_CSTRING(RDF_NAMESPACE_URI "Alt"),
&kRDF_Alt);
if (NS_FAILED(rv)) break;
rv = CallGetService("@mozilla.org/rdf/container-utils;1", &gRDFC);
if (NS_FAILED(rv)) break;
} while (0);
return rv;
}
nsRDFXMLSerializer::nsRDFXMLSerializer()
{
MOZ_COUNT_CTOR(nsRDFXMLSerializer);
}
nsRDFXMLSerializer::~nsRDFXMLSerializer()
{
MOZ_COUNT_DTOR(nsRDFXMLSerializer);
if (--gRefCnt == 0) {
NS_IF_RELEASE(kRDF_Bag);
NS_IF_RELEASE(kRDF_Seq);
NS_IF_RELEASE(kRDF_Alt);
NS_IF_RELEASE(kRDF_instanceOf);
NS_IF_RELEASE(kRDF_type);
NS_IF_RELEASE(kRDF_nextVal);
NS_IF_RELEASE(gRDFC);
}
}
NS_IMPL_ISUPPORTS(nsRDFXMLSerializer, nsIRDFXMLSerializer, nsIRDFXMLSource)
NS_IMETHODIMP
nsRDFXMLSerializer::Init(nsIRDFDataSource* aDataSource)
{
if (! aDataSource)
return NS_ERROR_NULL_POINTER;
mDataSource = aDataSource;
mDataSource->GetURI(getter_Copies(mBaseURLSpec));
// Add the ``RDF'' prefix, by default.
nsCOMPtr<nsIAtom> prefix;
prefix = do_GetAtom("RDF");
AddNameSpace(prefix, NS_LITERAL_STRING("http://www.w3.org/1999/02/22-rdf-syntax-ns#"));
prefix = do_GetAtom("NC");
AddNameSpace(prefix, NS_LITERAL_STRING("http://home.netscape.com/NC-rdf#"));
mPrefixID = 0;
return NS_OK;
}
NS_IMETHODIMP
nsRDFXMLSerializer::AddNameSpace(nsIAtom* aPrefix, const nsAString& aURI)
{
nsCOMPtr<nsIAtom> prefix = aPrefix;
if (!prefix) {
// Make up a prefix, we don't want default namespaces, so
// that we can use QNames for elements and attributes alike.
prefix = EnsureNewPrefix();
}
mNameSpaces.Put(aURI, prefix);
return NS_OK;
}
static nsresult
rdf_BlockingWrite(nsIOutputStream* stream, const char* buf, uint32_t size)
{
uint32_t written = 0;
uint32_t remaining = size;
while (remaining > 0) {
nsresult rv;
uint32_t cb;
if (NS_FAILED(rv = stream->Write(buf + written, remaining, &cb)))
return rv;
written += cb;
remaining -= cb;
}
return NS_OK;
}
static nsresult
rdf_BlockingWrite(nsIOutputStream* stream, const nsCSubstring& s)
{
return rdf_BlockingWrite(stream, s.BeginReading(), s.Length());
}
static nsresult
rdf_BlockingWrite(nsIOutputStream* stream, const nsAString& s)
{
NS_ConvertUTF16toUTF8 utf8(s);
return rdf_BlockingWrite(stream, utf8.get(), utf8.Length());
}
already_AddRefed<nsIAtom>
nsRDFXMLSerializer::EnsureNewPrefix()
{
nsAutoString qname;
nsCOMPtr<nsIAtom> prefix;
bool isNewPrefix;
do {
isNewPrefix = true;
qname.AssignLiteral("NS");
qname.AppendInt(++mPrefixID, 10);
prefix = do_GetAtom(qname);
nsNameSpaceMap::const_iterator iter = mNameSpaces.first();
while (iter != mNameSpaces.last() && isNewPrefix) {
isNewPrefix = (iter->mPrefix != prefix);
++iter;
}
} while (!isNewPrefix);
return prefix.forget();
}
// This converts a property resource (like
// "http://www.w3.org/TR/WD-rdf-syntax#Description") into a QName
// ("RDF:Description"), and registers the namespace, if it's made up.
nsresult
nsRDFXMLSerializer::RegisterQName(nsIRDFResource* aResource)
{
nsAutoCString uri, qname;
aResource->GetValueUTF8(uri);
nsNameSpaceMap::const_iterator iter = mNameSpaces.GetNameSpaceOf(uri);
if (iter != mNameSpaces.last()) {
NS_ENSURE_TRUE(iter->mPrefix, NS_ERROR_UNEXPECTED);
iter->mPrefix->ToUTF8String(qname);
qname.Append(':');
qname += StringTail(uri, uri.Length() - iter->mURI.Length());
mQNames.Put(aResource, qname);
return NS_OK;
}
// Okay, so we don't have it in our map. Try to make one up. This
// is very bogus.
int32_t i = uri.RFindChar('#'); // first try a '#'
if (i == -1) {
i = uri.RFindChar('/');
if (i == -1) {
// Okay, just punt and assume there is _no_ namespace on
// this thing...
mQNames.Put(aResource, uri);
return NS_OK;
}
}
// Take whatever is to the right of the '#' or '/' and call it the
// local name, make up a prefix.
nsCOMPtr<nsIAtom> prefix = EnsureNewPrefix();
mNameSpaces.Put(StringHead(uri, i+1), prefix);
prefix->ToUTF8String(qname);
qname.Append(':');
qname += StringTail(uri, uri.Length() - (i + 1));
mQNames.Put(aResource, qname);
return NS_OK;
}
nsresult
nsRDFXMLSerializer::GetQName(nsIRDFResource* aResource, nsCString& aQName)
{
return mQNames.Get(aResource, &aQName) ? NS_OK : NS_ERROR_UNEXPECTED;
}
bool
nsRDFXMLSerializer::IsContainerProperty(nsIRDFResource* aProperty)
{
// Return `true' if the property is an internal property related
// to being a container.
if (aProperty == kRDF_instanceOf)
return true;
if (aProperty == kRDF_nextVal)
return true;
bool isOrdinal = false;
gRDFC->IsOrdinalProperty(aProperty, &isOrdinal);
if (isOrdinal)
return true;
return false;
}
// convert '&', '<', and '>' into "&amp;", "&lt;", and "&gt", respectively.
static const char amp[] = "&amp;";
static const char lt[] = "&lt;";
static const char gt[] = "&gt;";
static const char quot[] = "&quot;";
static void
rdf_EscapeAmpersandsAndAngleBrackets(nsCString& s)
{
uint32_t newLength, origLength;
newLength = origLength = s.Length();
// Compute the length of the result string.
const char* start = s.BeginReading();
const char* end = s.EndReading();
const char* c = start;
while (c != end) {
switch (*c) {
case '&' :
newLength += sizeof(amp) - 2;
break;
case '<':
case '>':
newLength += sizeof(gt) - 2;
break;
default:
break;
}
++c;
}
if (newLength == origLength) {
// nothing to escape
return;
}
// escape the chars from the end back to the front.
s.SetLength(newLength);
// Buffer might have changed, get the pointers again
start = s.BeginReading(); // begin of string
c = start + origLength - 1; // last char in original string
char* w = s.EndWriting() - 1; // last char in grown buffer
while (c >= start) {
switch (*c) {
case '&' :
w -= 4;
nsCharTraits<char>::copy(w, amp, sizeof(amp) - 1);
break;
case '<':
w -= 3;
nsCharTraits<char>::copy(w, lt, sizeof(lt) - 1);
break;
case '>':
w -= 3;
nsCharTraits<char>::copy(w, gt, sizeof(gt) - 1);
break;
default:
*w = *c;
}
--w;
--c;
}
}
// convert '"' to "&quot;"
static void
rdf_EscapeQuotes(nsCString& s)
{
int32_t i = 0;
while ((i = s.FindChar('"', i)) != -1) {
s.Replace(i, 1, quot, sizeof(quot) - 1);
i += sizeof(quot) - 2;
}
}
static void
rdf_EscapeAttributeValue(nsCString& s)
{
rdf_EscapeAmpersandsAndAngleBrackets(s);
rdf_EscapeQuotes(s);
}
nsresult
nsRDFXMLSerializer::SerializeInlineAssertion(nsIOutputStream* aStream,
nsIRDFResource* aResource,
nsIRDFResource* aProperty,
nsIRDFLiteral* aValue)
{
nsresult rv;
nsCString qname;
rv = GetQName(aProperty, qname);
NS_ENSURE_SUCCESS(rv, rv);
rv = rdf_BlockingWrite(aStream,
NS_LITERAL_CSTRING("\n "));
if (NS_FAILED(rv)) return rv;
const char16_t* value;
aValue->GetValueConst(&value);
NS_ConvertUTF16toUTF8 s(value);
rdf_EscapeAttributeValue(s);
rv = rdf_BlockingWrite(aStream, qname);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, "=\"", 2);
if (NS_FAILED(rv)) return rv;
s.Append('"');
return rdf_BlockingWrite(aStream, s);
}
nsresult
nsRDFXMLSerializer::SerializeChildAssertion(nsIOutputStream* aStream,
nsIRDFResource* aResource,
nsIRDFResource* aProperty,
nsIRDFNode* aValue)
{
nsCString qname;
nsresult rv = GetQName(aProperty, qname);
NS_ENSURE_SUCCESS(rv, rv);
rv = rdf_BlockingWrite(aStream, " <", 5);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, qname);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIRDFResource> resource;
nsCOMPtr<nsIRDFLiteral> literal;
nsCOMPtr<nsIRDFInt> number;
nsCOMPtr<nsIRDFDate> date;
if ((resource = do_QueryInterface(aValue)) != nullptr) {
nsAutoCString uri;
resource->GetValueUTF8(uri);
rdf_MakeRelativeRef(mBaseURLSpec, uri);
rdf_EscapeAttributeValue(uri);
rv = rdf_BlockingWrite(aStream, kRDFResource1,
sizeof(kRDFResource1) - 1);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, uri);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, kRDFResource2,
sizeof(kRDFResource2) - 1);
if (NS_FAILED(rv)) return rv;
goto no_close_tag;
}
else if ((literal = do_QueryInterface(aValue)) != nullptr) {
const char16_t *value;
literal->GetValueConst(&value);
NS_ConvertUTF16toUTF8 s(value);
rdf_EscapeAmpersandsAndAngleBrackets(s);
rv = rdf_BlockingWrite(aStream, ">", 1);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, s);
if (NS_FAILED(rv)) return rv;
}
else if ((number = do_QueryInterface(aValue)) != nullptr) {
int32_t value;
number->GetValue(&value);
nsAutoCString n;
n.AppendInt(value);
rv = rdf_BlockingWrite(aStream, kRDFParseTypeInteger,
sizeof(kRDFParseTypeInteger) - 1);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, n);
if (NS_FAILED(rv)) return rv;
}
else if ((date = do_QueryInterface(aValue)) != nullptr) {
PRTime value;
date->GetValue(&value);
nsAutoCString s;
rdf_FormatDate(value, s);
rv = rdf_BlockingWrite(aStream, kRDFParseTypeDate,
sizeof(kRDFParseTypeDate) - 1);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, s);
if (NS_FAILED(rv)) return rv;
}
else {
// XXX it doesn't support nsIRDFResource _or_ nsIRDFLiteral???
// We should serialize nsIRDFInt, nsIRDFDate, etc...
NS_WARNING("unknown RDF node type");
rv = rdf_BlockingWrite(aStream, kRDFUnknown, sizeof(kRDFUnknown) - 1);
if (NS_FAILED(rv)) return rv;
}
rv = rdf_BlockingWrite(aStream, "</", 2);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, qname);
if (NS_FAILED(rv)) return rv;
return rdf_BlockingWrite(aStream, ">\n", 2);
no_close_tag:
return NS_OK;
}
nsresult
nsRDFXMLSerializer::SerializeProperty(nsIOutputStream* aStream,
nsIRDFResource* aResource,
nsIRDFResource* aProperty,
bool aInline,
int32_t* aSkipped)
{
nsresult rv = NS_OK;
int32_t skipped = 0;
nsCOMPtr<nsISimpleEnumerator> assertions;
mDataSource->GetTargets(aResource, aProperty, true, getter_AddRefs(assertions));
if (! assertions)
return NS_ERROR_FAILURE;
// Serializing the assertion inline is ok as long as the property has
// only one target value, and it is a literal that doesn't include line
// breaks.
bool needsChild = false;
while (1) {
bool hasMore = false;
assertions->HasMoreElements(&hasMore);
if (! hasMore)
break;
nsCOMPtr<nsISupports> isupports;
assertions->GetNext(getter_AddRefs(isupports));
nsCOMPtr<nsIRDFLiteral> literal = do_QueryInterface(isupports);
needsChild |= (!literal);
if (!needsChild) {
assertions->HasMoreElements(&needsChild);
if (!needsChild) {
const char16_t* literalVal = nullptr;
literal->GetValueConst(&literalVal);
if (literalVal) {
for (; *literalVal; literalVal++) {
if (*literalVal == char16_t('\n') ||
*literalVal == char16_t('\r')) {
needsChild = true;
break;
}
}
}
}
}
if (aInline && !needsChild) {
rv = SerializeInlineAssertion(aStream, aResource, aProperty, literal);
}
else if (!aInline && needsChild) {
nsCOMPtr<nsIRDFNode> value = do_QueryInterface(isupports);
rv = SerializeChildAssertion(aStream, aResource, aProperty, value);
}
else {
++skipped;
rv = NS_OK;
}
if (NS_FAILED(rv))
break;
}
*aSkipped += skipped;
return rv;
}
nsresult
nsRDFXMLSerializer::SerializeDescription(nsIOutputStream* aStream,
nsIRDFResource* aResource)
{
nsresult rv;
bool isTypedNode = false;
nsCString typeQName;
nsCOMPtr<nsIRDFNode> typeNode;
mDataSource->GetTarget(aResource, kRDF_type, true, getter_AddRefs(typeNode));
if (typeNode) {
nsCOMPtr<nsIRDFResource> type = do_QueryInterface(typeNode, &rv);
if (type) {
// Try to get a namespace prefix. If none is available,
// just treat the description as if it weren't a typed node
// after all and emit rdf:type as a normal property. This
// seems preferable to using a bogus (invented) prefix.
isTypedNode = NS_SUCCEEDED(GetQName(type, typeQName));
}
}
nsAutoCString uri;
rv = aResource->GetValueUTF8(uri);
if (NS_FAILED(rv)) return rv;
rdf_MakeRelativeRef(mBaseURLSpec, uri);
rdf_EscapeAttributeValue(uri);
// Emit an open tag and the subject
if (isTypedNode) {
rv = rdf_BlockingWrite(aStream, NS_LITERAL_STRING(" <"));
if (NS_FAILED(rv)) return rv;
// Watch out for the default namespace!
rv = rdf_BlockingWrite(aStream, typeQName);
if (NS_FAILED(rv)) return rv;
}
else {
rv = rdf_BlockingWrite(aStream, kRDFDescriptionOpen,
sizeof(kRDFDescriptionOpen) - 1);
if (NS_FAILED(rv)) return rv;
}
if (uri[0] == char16_t('#')) {
uri.Cut(0, 1);
rv = rdf_BlockingWrite(aStream, kIDAttr, sizeof(kIDAttr) - 1);
}
else {
rv = rdf_BlockingWrite(aStream, kAboutAttr, sizeof(kAboutAttr) - 1);
}
if (NS_FAILED(rv)) return rv;
uri.Append('"');
rv = rdf_BlockingWrite(aStream, uri);
if (NS_FAILED(rv)) return rv;
// Any value that's a literal we can write out as an inline
// attribute on the RDF:Description
nsAutoTArray<nsIRDFResource*, 8> visited;
int32_t skipped = 0;
nsCOMPtr<nsISimpleEnumerator> arcs;
mDataSource->ArcLabelsOut(aResource, getter_AddRefs(arcs));
if (arcs) {
// Don't re-serialize rdf:type later on
if (isTypedNode)
visited.AppendElement(kRDF_type);
while (1) {
bool hasMore = false;
arcs->HasMoreElements(&hasMore);
if (! hasMore)
break;
nsCOMPtr<nsISupports> isupports;
arcs->GetNext(getter_AddRefs(isupports));
nsCOMPtr<nsIRDFResource> property = do_QueryInterface(isupports);
if (! property)
continue;
// Ignore properties that pertain to containers; we may be
// called from SerializeContainer() if the container resource
// has been assigned non-container properties.
if (IsContainerProperty(property))
continue;
// Only serialize values for the property once.
if (visited.Contains(property.get()))
continue;
visited.AppendElement(property.get());
SerializeProperty(aStream, aResource, property, true, &skipped);
}
}
if (skipped) {
// Close the RDF:Description tag.
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(">\n"));
if (NS_FAILED(rv)) return rv;
// Now write out resources (which might have their own
// substructure) as children.
mDataSource->ArcLabelsOut(aResource, getter_AddRefs(arcs));
if (arcs) {
// Forget that we've visited anything
visited.Clear();
// ... except for rdf:type
if (isTypedNode)
visited.AppendElement(kRDF_type);
while (1) {
bool hasMore = false;
arcs->HasMoreElements(&hasMore);
if (! hasMore)
break;
nsCOMPtr<nsISupports> isupports;
arcs->GetNext(getter_AddRefs(isupports));
nsCOMPtr<nsIRDFResource> property = do_QueryInterface(isupports);
if (! property)
continue;
// Ignore properties that pertain to containers; we may be
// called from SerializeContainer() if the container
// resource has been assigned non-container properties.
if (IsContainerProperty(property))
continue;
// have we already seen this property? If so, don't write it
// out again; serialize property will write each instance.
if (visited.Contains(property.get()))
continue;
visited.AppendElement(property.get());
SerializeProperty(aStream, aResource, property, false, &skipped);
}
}
// Emit a proper close-tag.
if (isTypedNode) {
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(" </"));
if (NS_FAILED(rv)) return rv;
// Watch out for the default namespace!
rdf_BlockingWrite(aStream, typeQName);
if (NS_FAILED(rv)) return rv;
rdf_BlockingWrite(aStream, ">\n", 2);
if (NS_FAILED(rv)) return rv;
}
else {
rv = rdf_BlockingWrite(aStream, kRDFDescriptionClose,
sizeof(kRDFDescriptionClose) - 1);
if (NS_FAILED(rv)) return rv;
}
}
else {
// If we saw _no_ child properties, then we can don't need a
// close-tag.
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(" />\n"));
if (NS_FAILED(rv)) return rv;
}
return NS_OK;
}
nsresult
nsRDFXMLSerializer::SerializeMember(nsIOutputStream* aStream,
nsIRDFResource* aContainer,
nsIRDFNode* aMember)
{
// If it's a resource, then output a "<RDF:li RDF:resource=... />"
// tag, because we'll be dumping the resource separately. (We
// iterate thru all the resources in the datasource,
// remember?) Otherwise, output the literal value.
nsCOMPtr<nsIRDFResource> resource;
nsCOMPtr<nsIRDFLiteral> literal;
nsCOMPtr<nsIRDFInt> number;
nsCOMPtr<nsIRDFDate> date;
static const char kRDFLIOpen[] = " <RDF:li";
nsresult rv = rdf_BlockingWrite(aStream, kRDFLIOpen,
sizeof(kRDFLIOpen) - 1);
if (NS_FAILED(rv)) return rv;
if ((resource = do_QueryInterface(aMember)) != nullptr) {
nsAutoCString uri;
resource->GetValueUTF8(uri);
rdf_MakeRelativeRef(mBaseURLSpec, uri);
rdf_EscapeAttributeValue(uri);
rv = rdf_BlockingWrite(aStream, kRDFResource1,
sizeof(kRDFResource1) - 1);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, uri);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, kRDFResource2,
sizeof(kRDFResource2) - 1);
if (NS_FAILED(rv)) return rv;
goto no_close_tag;
}
else if ((literal = do_QueryInterface(aMember)) != nullptr) {
const char16_t *value;
literal->GetValueConst(&value);
static const char kRDFLIOpenGT[] = ">";
// close the '<RDF:LI' before adding the literal
rv = rdf_BlockingWrite(aStream, kRDFLIOpenGT,
sizeof(kRDFLIOpenGT) - 1);
if (NS_FAILED(rv)) return rv;
NS_ConvertUTF16toUTF8 s(value);
rdf_EscapeAmpersandsAndAngleBrackets(s);
rv = rdf_BlockingWrite(aStream, s);
if (NS_FAILED(rv)) return rv;
}
else if ((number = do_QueryInterface(aMember)) != nullptr) {
int32_t value;
number->GetValue(&value);
nsAutoCString n;
n.AppendInt(value);
rv = rdf_BlockingWrite(aStream, kRDFParseTypeInteger,
sizeof(kRDFParseTypeInteger) - 1);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, n);
if (NS_FAILED(rv)) return rv;
}
else if ((date = do_QueryInterface(aMember)) != nullptr) {
PRTime value;
date->GetValue(&value);
nsAutoCString s;
rdf_FormatDate(value, s);
rv = rdf_BlockingWrite(aStream, kRDFParseTypeDate,
sizeof(kRDFParseTypeDate) - 1);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, s);
if (NS_FAILED(rv)) return rv;
}
else {
// XXX it doesn't support nsIRDFResource _or_ nsIRDFLiteral???
// We should serialize nsIRDFInt, nsIRDFDate, etc...
NS_WARNING("unknown RDF node type");
rv = rdf_BlockingWrite(aStream, kRDFUnknown, sizeof(kRDFUnknown) - 1);
if (NS_FAILED(rv)) return rv;
}
{
static const char kRDFLIClose[] = "</RDF:li>\n";
rv = rdf_BlockingWrite(aStream, kRDFLIClose, sizeof(kRDFLIClose) - 1);
if (NS_FAILED(rv)) return rv;
}
no_close_tag:
return NS_OK;
}
nsresult
nsRDFXMLSerializer::SerializeContainer(nsIOutputStream* aStream,
nsIRDFResource* aContainer)
{
nsresult rv;
nsAutoCString tag;
// Decide if it's a sequence, bag, or alternation, and print the
// appropriate tag-open sequence
if (IsA(mDataSource, aContainer, kRDF_Bag)) {
tag.AssignLiteral("RDF:Bag");
}
else if (IsA(mDataSource, aContainer, kRDF_Seq)) {
tag.AssignLiteral("RDF:Seq");
}
else if (IsA(mDataSource, aContainer, kRDF_Alt)) {
tag.AssignLiteral("RDF:Alt");
}
else {
NS_ASSERTION(false, "huh? this is _not_ a container.");
return NS_ERROR_UNEXPECTED;
}
rv = rdf_BlockingWrite(aStream, " <", 3);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, tag);
if (NS_FAILED(rv)) return rv;
// Unfortunately, we always need to print out the identity of the
// resource, even if was constructed "anonymously". We need to do
// this because we never really know who else might be referring
// to it...
nsAutoCString uri;
if (NS_SUCCEEDED(aContainer->GetValueUTF8(uri))) {
rdf_MakeRelativeRef(mBaseURLSpec, uri);
rdf_EscapeAttributeValue(uri);
if (uri.First() == '#') {
// Okay, it's actually identified as an element in the
// current document, not trying to decorate some absolute
// URI. We can use the 'ID=' attribute...
uri.Cut(0, 1); // chop the '#'
rv = rdf_BlockingWrite(aStream, kIDAttr, sizeof(kIDAttr) - 1);
if (NS_FAILED(rv)) return rv;
}
else {
// We need to cheat and spit out an illegal 'about=' on
// the sequence.
rv = rdf_BlockingWrite(aStream, kAboutAttr,
sizeof(kAboutAttr) - 1);
if (NS_FAILED(rv)) return rv;
}
rv = rdf_BlockingWrite(aStream, uri);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, "\"", 1);
if (NS_FAILED(rv)) return rv;
}
rv = rdf_BlockingWrite(aStream, ">\n", 2);
if (NS_FAILED(rv)) return rv;
// First iterate through each of the ordinal elements (the RDF/XML
// syntax doesn't allow us to place properties on RDF container
// elements).
nsCOMPtr<nsISimpleEnumerator> elements;
rv = NS_NewContainerEnumerator(mDataSource, aContainer, getter_AddRefs(elements));
if (NS_SUCCEEDED(rv)) {
while (1) {
bool hasMore;
rv = elements->HasMoreElements(&hasMore);
if (NS_FAILED(rv)) break;
if (! hasMore)
break;
nsCOMPtr<nsISupports> isupports;
elements->GetNext(getter_AddRefs(isupports));
nsCOMPtr<nsIRDFNode> element = do_QueryInterface(isupports);
NS_ASSERTION(element != nullptr, "not an nsIRDFNode");
if (! element)
continue;
SerializeMember(aStream, aContainer, element);
}
}
// close the container tag
rv = rdf_BlockingWrite(aStream, " </", 4);
if (NS_FAILED(rv)) return rv;
tag.Append(">\n", 2);
rv = rdf_BlockingWrite(aStream, tag);
if (NS_FAILED(rv)) return rv;
// Now, we iterate through _all_ of the arcs, in case someone has
// applied properties to the bag itself. These'll be placed in a
// separate RDF:Description element.
nsCOMPtr<nsISimpleEnumerator> arcs;
mDataSource->ArcLabelsOut(aContainer, getter_AddRefs(arcs));
bool wroteDescription = false;
while (! wroteDescription) {
bool hasMore = false;
rv = arcs->HasMoreElements(&hasMore);
if (NS_FAILED(rv)) break;
if (! hasMore)
break;
nsIRDFResource* property;
rv = arcs->GetNext((nsISupports**) &property);
if (NS_FAILED(rv)) break;
// If it's a membership property, then output a "LI"
// tag. Otherwise, output a property.
if (! IsContainerProperty(property)) {
rv = SerializeDescription(aStream, aContainer);
wroteDescription = true;
}
NS_RELEASE(property);
if (NS_FAILED(rv))
break;
}
return NS_OK;
}
nsresult
nsRDFXMLSerializer::SerializePrologue(nsIOutputStream* aStream)
{
static const char kXMLVersion[] = "<?xml version=\"1.0\"?>\n";
nsresult rv;
rv = rdf_BlockingWrite(aStream, kXMLVersion, sizeof(kXMLVersion) - 1);
if (NS_FAILED(rv)) return rv;
// global name space declarations
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("<RDF:RDF "));
if (NS_FAILED(rv)) return rv;
nsNameSpaceMap::const_iterator first = mNameSpaces.first();
nsNameSpaceMap::const_iterator last = mNameSpaces.last();
for (nsNameSpaceMap::const_iterator entry = first; entry != last; ++entry) {
if (entry != first) {
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("\n "));
if (NS_FAILED(rv)) return rv;
}
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("xmlns"));
if (NS_FAILED(rv)) return rv;
if (entry->mPrefix) {
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(":"));
if (NS_FAILED(rv)) return rv;
nsAutoCString prefix;
entry->mPrefix->ToUTF8String(prefix);
rv = rdf_BlockingWrite(aStream, prefix);
if (NS_FAILED(rv)) return rv;
}
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("=\""));
if (NS_FAILED(rv)) return rv;
nsAutoCString uri(entry->mURI);
rdf_EscapeAttributeValue(uri);
rv = rdf_BlockingWrite(aStream, uri);
if (NS_FAILED(rv)) return rv;
rv = rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("\""));
if (NS_FAILED(rv)) return rv;
}
return rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING(">\n"));
}
nsresult
nsRDFXMLSerializer::SerializeEpilogue(nsIOutputStream* aStream)
{
return rdf_BlockingWrite(aStream, NS_LITERAL_CSTRING("</RDF:RDF>\n"));
}
class QNameCollector final : public rdfITripleVisitor {
public:
NS_DECL_ISUPPORTS
NS_DECL_RDFITRIPLEVISITOR
explicit QNameCollector(nsRDFXMLSerializer* aParent)
: mParent(aParent){}
private:
~QNameCollector() {}
nsRDFXMLSerializer* mParent;
};
NS_IMPL_ISUPPORTS(QNameCollector, rdfITripleVisitor)
nsresult
QNameCollector::Visit(nsIRDFNode* aSubject, nsIRDFResource* aPredicate,
nsIRDFNode* aObject, bool aTruthValue)
{
if (aPredicate == mParent->kRDF_type) {
// try to get a type QName for aObject, should be a resource
nsCOMPtr<nsIRDFResource> resType = do_QueryInterface(aObject);
if (!resType) {
// ignore error
return NS_OK;
}
if (mParent->mQNames.Get(resType, nullptr)) {
return NS_OK;
}
mParent->RegisterQName(resType);
return NS_OK;
}
if (mParent->mQNames.Get(aPredicate, nullptr)) {
return NS_OK;
}
if (aPredicate == mParent->kRDF_instanceOf ||
aPredicate == mParent->kRDF_nextVal)
return NS_OK;
bool isOrdinal = false;
mParent->gRDFC->IsOrdinalProperty(aPredicate, &isOrdinal);
if (isOrdinal)
return NS_OK;
mParent->RegisterQName(aPredicate);
return NS_OK;
}
nsresult
nsRDFXMLSerializer::CollectNamespaces()
{
// Iterate over all Triples to get namespaces for subject resource types
// and Predicates and cache all the QNames we want to use.
nsCOMPtr<rdfITripleVisitor> collector =
new QNameCollector(this);
nsCOMPtr<rdfIDataSource> ds = do_QueryInterface(mDataSource); // XXX API
NS_ENSURE_TRUE(collector && ds, NS_ERROR_FAILURE);
return ds->VisitAllTriples(collector);
}
//----------------------------------------------------------------------
NS_IMETHODIMP
nsRDFXMLSerializer::Serialize(nsIOutputStream* aStream)
{
nsresult rv;
rv = CollectNamespaces();
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsISimpleEnumerator> resources;
rv = mDataSource->GetAllResources(getter_AddRefs(resources));
if (NS_FAILED(rv)) return rv;
rv = SerializePrologue(aStream);
if (NS_FAILED(rv))
return rv;
while (1) {
bool hasMore = false;
resources->HasMoreElements(&hasMore);
if (! hasMore)
break;
nsCOMPtr<nsISupports> isupports;
resources->GetNext(getter_AddRefs(isupports));
nsCOMPtr<nsIRDFResource> resource = do_QueryInterface(isupports);
if (! resource)
continue;
if (IsA(mDataSource, resource, kRDF_Bag) ||
IsA(mDataSource, resource, kRDF_Seq) ||
IsA(mDataSource, resource, kRDF_Alt)) {
rv = SerializeContainer(aStream, resource);
}
else {
rv = SerializeDescription(aStream, resource);
}
if (NS_FAILED(rv))
break;
}
rv = SerializeEpilogue(aStream);
return rv;
}
bool
nsRDFXMLSerializer::IsA(nsIRDFDataSource* aDataSource, nsIRDFResource* aResource, nsIRDFResource* aType)
{
nsresult rv;
bool result;
rv = aDataSource->HasAssertion(aResource, kRDF_instanceOf, aType, true, &result);
if (NS_FAILED(rv)) return false;
return result;
}
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