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gecko-dev/dom/xul/templates/nsXULTemplateBuilder.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/. */
/*
Builds content from a datasource using the XUL <template> tag.
TO DO
. Fix ContentTagTest's location in the network construction
To turn on logging for this module, set:
NSPR_LOG_MODULES nsXULTemplateBuilder:5
*/
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsIContent.h"
#include "nsIDOMElement.h"
#include "nsIDOMNode.h"
#include "nsIDOMDocument.h"
#include "nsIDOMXMLDocument.h"
#include "nsIDOMXULElement.h"
#include "nsIDocument.h"
#include "nsBindingManager.h"
#include "nsIDOMNodeList.h"
#include "nsIObserverService.h"
#include "nsIRDFCompositeDataSource.h"
#include "nsIRDFInferDataSource.h"
#include "nsIRDFContainerUtils.h"
#include "nsIXULDocument.h"
#include "nsIXULTemplateBuilder.h"
#include "nsIXULBuilderListener.h"
#include "nsIRDFRemoteDataSource.h"
#include "nsIRDFService.h"
#include "nsIScriptContext.h"
#include "nsIScriptGlobalObject.h"
#include "nsIServiceManager.h"
#include "nsISimpleEnumerator.h"
#include "nsIMutableArray.h"
#include "nsIURL.h"
#include "nsIXPConnect.h"
#include "nsContentCID.h"
#include "nsNameSpaceManager.h"
#include "nsRDFCID.h"
#include "nsXULContentUtils.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsXPIDLString.h"
#include "nsWhitespaceTokenizer.h"
#include "nsGkAtoms.h"
#include "nsXULElement.h"
#include "jsapi.h"
#include "prlog.h"
#include "rdf.h"
#include "pldhash.h"
#include "plhash.h"
#include "nsDOMClassInfoID.h"
#include "nsPIDOMWindow.h"
#include "nsIConsoleService.h"
#include "nsNetUtil.h"
#include "nsXULTemplateBuilder.h"
#include "nsXULTemplateQueryProcessorRDF.h"
#include "nsXULTemplateQueryProcessorXML.h"
#include "nsXULTemplateQueryProcessorStorage.h"
#include "nsContentUtils.h"
#include "ChildIterator.h"
#include "mozilla/dom/ScriptSettings.h"
using namespace mozilla::dom;
using namespace mozilla;
//----------------------------------------------------------------------
//
// nsXULTemplateBuilder
//
nsrefcnt nsXULTemplateBuilder::gRefCnt = 0;
nsIRDFService* nsXULTemplateBuilder::gRDFService;
nsIRDFContainerUtils* nsXULTemplateBuilder::gRDFContainerUtils;
nsIScriptSecurityManager* nsXULTemplateBuilder::gScriptSecurityManager;
nsIPrincipal* nsXULTemplateBuilder::gSystemPrincipal;
nsIObserverService* nsXULTemplateBuilder::gObserverService;
#ifdef PR_LOGGING
PRLogModuleInfo* gXULTemplateLog;
#endif
#define NS_QUERY_PROCESSOR_CONTRACTID_PREFIX "@mozilla.org/xul/xul-query-processor;1?name="
//----------------------------------------------------------------------
//
// nsXULTemplateBuilder methods
//
nsXULTemplateBuilder::nsXULTemplateBuilder(void)
: mQueriesCompiled(false),
mFlags(0),
mTop(nullptr),
mObservedDocument(nullptr)
{
MOZ_COUNT_CTOR(nsXULTemplateBuilder);
}
static PLDHashOperator
DestroyMatchList(nsISupports* aKey, nsTemplateMatch*& aMatch, void* aContext)
{
// delete all the matches in the list
while (aMatch) {
nsTemplateMatch* next = aMatch->mNext;
nsTemplateMatch::Destroy(aMatch, true);
aMatch = next;
}
return PL_DHASH_REMOVE;
}
nsXULTemplateBuilder::~nsXULTemplateBuilder(void)
{
Uninit(true);
if (--gRefCnt == 0) {
NS_IF_RELEASE(gRDFService);
NS_IF_RELEASE(gRDFContainerUtils);
NS_IF_RELEASE(gSystemPrincipal);
NS_IF_RELEASE(gScriptSecurityManager);
NS_IF_RELEASE(gObserverService);
}
MOZ_COUNT_DTOR(nsXULTemplateBuilder);
}
nsresult
nsXULTemplateBuilder::InitGlobals()
{
nsresult rv;
if (gRefCnt++ == 0) {
// Initialize the global shared reference to the service
// manager and get some shared resource objects.
NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
rv = CallGetService(kRDFServiceCID, &gRDFService);
if (NS_FAILED(rv))
return rv;
NS_DEFINE_CID(kRDFContainerUtilsCID, NS_RDFCONTAINERUTILS_CID);
rv = CallGetService(kRDFContainerUtilsCID, &gRDFContainerUtils);
if (NS_FAILED(rv))
return rv;
rv = CallGetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID,
&gScriptSecurityManager);
if (NS_FAILED(rv))
return rv;
rv = gScriptSecurityManager->GetSystemPrincipal(&gSystemPrincipal);
if (NS_FAILED(rv))
return rv;
rv = CallGetService(NS_OBSERVERSERVICE_CONTRACTID, &gObserverService);
if (NS_FAILED(rv))
return rv;
}
#ifdef PR_LOGGING
if (! gXULTemplateLog)
gXULTemplateLog = PR_NewLogModule("nsXULTemplateBuilder");
#endif
return NS_OK;
}
void
nsXULTemplateBuilder::StartObserving(nsIDocument* aDocument)
{
aDocument->AddObserver(this);
mObservedDocument = aDocument;
gObserverService->AddObserver(this, DOM_WINDOW_DESTROYED_TOPIC, false);
}
void
nsXULTemplateBuilder::StopObserving()
{
MOZ_ASSERT(mObservedDocument);
mObservedDocument->RemoveObserver(this);
mObservedDocument = nullptr;
gObserverService->RemoveObserver(this, DOM_WINDOW_DESTROYED_TOPIC);
}
void
nsXULTemplateBuilder::CleanUp(bool aIsFinal)
{
for (int32_t q = mQuerySets.Length() - 1; q >= 0; q--) {
nsTemplateQuerySet* qs = mQuerySets[q];
delete qs;
}
mQuerySets.Clear();
mMatchMap.Enumerate(DestroyMatchList, nullptr);
// Setting mQueryProcessor to null will close connections. This would be
// handled by the cycle collector, but we want to close them earlier.
if (aIsFinal)
mQueryProcessor = nullptr;
}
void
nsXULTemplateBuilder::Uninit(bool aIsFinal)
{
if (mObservedDocument && aIsFinal) {
StopObserving();
}
if (mQueryProcessor)
mQueryProcessor->Done();
CleanUp(aIsFinal);
mRootResult = nullptr;
mRefVariable = nullptr;
mMemberVariable = nullptr;
mQueriesCompiled = false;
}
static PLDHashOperator
TraverseMatchList(nsISupports* aKey, nsTemplateMatch* aMatch, void* aContext)
{
nsCycleCollectionTraversalCallback *cb =
static_cast<nsCycleCollectionTraversalCallback*>(aContext);
cb->NoteXPCOMChild(aKey);
nsTemplateMatch* match = aMatch;
while (match) {
cb->NoteXPCOMChild(match->GetContainer());
cb->NoteXPCOMChild(match->mResult);
match = match->mNext;
}
return PL_DHASH_NEXT;
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsXULTemplateBuilder)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXULTemplateBuilder)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDataSource)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDB)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCompDB)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRootResult)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mListeners)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mQueryProcessor)
tmp->mMatchMap.Enumerate(DestroyMatchList, nullptr);
for (uint32_t i = 0; i < tmp->mQuerySets.Length(); ++i) {
nsTemplateQuerySet* qs = tmp->mQuerySets[i];
delete qs;
}
tmp->mQuerySets.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXULTemplateBuilder)
if (tmp->mObservedDocument && !cb.WantAllTraces()) {
// The global observer service holds us alive.
return NS_SUCCESS_INTERRUPTED_TRAVERSE;
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDataSource)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDB)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCompDB)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRootResult)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListeners)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mQueryProcessor)
tmp->mMatchMap.EnumerateRead(TraverseMatchList, &cb);
{
uint32_t i, count = tmp->mQuerySets.Length();
for (i = 0; i < count; ++i) {
nsTemplateQuerySet *set = tmp->mQuerySets[i];
cb.NoteXPCOMChild(set->mQueryNode);
cb.NoteXPCOMChild(set->mCompiledQuery);
uint16_t j, rulesCount = set->RuleCount();
for (j = 0; j < rulesCount; ++j) {
set->GetRuleAt(j)->Traverse(cb);
}
}
}
tmp->Traverse(cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXULTemplateBuilder)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsXULTemplateBuilder)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXULTemplateBuilder)
NS_INTERFACE_MAP_ENTRY(nsIXULTemplateBuilder)
NS_INTERFACE_MAP_ENTRY(nsIDocumentObserver)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXULTemplateBuilder)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(XULTemplateBuilder)
NS_INTERFACE_MAP_END
//----------------------------------------------------------------------
//
// nsIXULTemplateBuilder methods
//
NS_IMETHODIMP
nsXULTemplateBuilder::GetRoot(nsIDOMElement** aResult)
{
if (mRoot) {
return CallQueryInterface(mRoot, aResult);
}
*aResult = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::GetDatasource(nsISupports** aResult)
{
if (mCompDB)
NS_ADDREF(*aResult = mCompDB);
else
NS_IF_ADDREF(*aResult = mDataSource);
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::SetDatasource(nsISupports* aResult)
{
mDataSource = aResult;
mCompDB = do_QueryInterface(mDataSource);
return Rebuild();
}
NS_IMETHODIMP
nsXULTemplateBuilder::GetDatabase(nsIRDFCompositeDataSource** aResult)
{
NS_IF_ADDREF(*aResult = mCompDB);
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::GetQueryProcessor(nsIXULTemplateQueryProcessor** aResult)
{
NS_IF_ADDREF(*aResult = mQueryProcessor.get());
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::AddRuleFilter(nsIDOMNode* aRule, nsIXULTemplateRuleFilter* aFilter)
{
if (!aRule || !aFilter)
return NS_ERROR_NULL_POINTER;
// a custom rule filter may be added, one for each rule. If a new one is
// added, it replaces the old one. Look for the right rule and set its
// filter
int32_t count = mQuerySets.Length();
for (int32_t q = 0; q < count; q++) {
nsTemplateQuerySet* queryset = mQuerySets[q];
int16_t rulecount = queryset->RuleCount();
for (int16_t r = 0; r < rulecount; r++) {
nsTemplateRule* rule = queryset->GetRuleAt(r);
nsCOMPtr<nsIDOMNode> rulenode;
rule->GetRuleNode(getter_AddRefs(rulenode));
if (aRule == rulenode) {
rule->SetRuleFilter(aFilter);
return NS_OK;
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::Rebuild()
{
int32_t i;
for (i = mListeners.Count() - 1; i >= 0; --i) {
mListeners[i]->WillRebuild(this);
}
nsresult rv = RebuildAll();
for (i = mListeners.Count() - 1; i >= 0; --i) {
mListeners[i]->DidRebuild(this);
}
return rv;
}
NS_IMETHODIMP
nsXULTemplateBuilder::Refresh()
{
nsresult rv;
if (!mCompDB)
return NS_ERROR_FAILURE;
nsCOMPtr<nsISimpleEnumerator> dslist;
rv = mCompDB->GetDataSources(getter_AddRefs(dslist));
NS_ENSURE_SUCCESS(rv, rv);
bool hasMore;
nsCOMPtr<nsISupports> next;
nsCOMPtr<nsIRDFRemoteDataSource> rds;
while(NS_SUCCEEDED(dslist->HasMoreElements(&hasMore)) && hasMore) {
dslist->GetNext(getter_AddRefs(next));
if (next && (rds = do_QueryInterface(next))) {
rds->Refresh(false);
}
}
// XXXbsmedberg: it would be kinda nice to install an async nsIRDFXMLSink
// observer and call rebuild() once the load is complete. See bug 254600.
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::Init(nsIContent* aElement)
{
NS_ENSURE_TRUE(aElement, NS_ERROR_NULL_POINTER);
mRoot = aElement;
nsCOMPtr<nsIDocument> doc = mRoot->GetComposedDoc();
NS_ASSERTION(doc, "element has no document");
if (! doc)
return NS_ERROR_UNEXPECTED;
bool shouldDelay;
nsresult rv = LoadDataSources(doc, &shouldDelay);
if (NS_SUCCEEDED(rv)) {
StartObserving(doc);
}
return rv;
}
NS_IMETHODIMP
nsXULTemplateBuilder::CreateContents(nsIContent* aElement, bool aForceCreation)
{
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::HasGeneratedContent(nsIRDFResource* aResource,
nsIAtom* aTag,
bool* aGenerated)
{
*aGenerated = false;
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::AddResult(nsIXULTemplateResult* aResult,
nsIDOMNode* aQueryNode)
{
NS_ENSURE_ARG_POINTER(aResult);
NS_ENSURE_ARG_POINTER(aQueryNode);
return UpdateResult(nullptr, aResult, aQueryNode);
}
NS_IMETHODIMP
nsXULTemplateBuilder::RemoveResult(nsIXULTemplateResult* aResult)
{
NS_ENSURE_ARG_POINTER(aResult);
return UpdateResult(aResult, nullptr, nullptr);
}
NS_IMETHODIMP
nsXULTemplateBuilder::ReplaceResult(nsIXULTemplateResult* aOldResult,
nsIXULTemplateResult* aNewResult,
nsIDOMNode* aQueryNode)
{
NS_ENSURE_ARG_POINTER(aOldResult);
NS_ENSURE_ARG_POINTER(aNewResult);
NS_ENSURE_ARG_POINTER(aQueryNode);
// just remove the old result and then add a new result separately
nsresult rv = UpdateResult(aOldResult, nullptr, nullptr);
if (NS_FAILED(rv))
return rv;
return UpdateResult(nullptr, aNewResult, aQueryNode);
}
nsresult
nsXULTemplateBuilder::UpdateResult(nsIXULTemplateResult* aOldResult,
nsIXULTemplateResult* aNewResult,
nsIDOMNode* aQueryNode)
{
PR_LOG(gXULTemplateLog, PR_LOG_ALWAYS,
("nsXULTemplateBuilder::UpdateResult %p %p %p",
aOldResult, aNewResult, aQueryNode));
if (!mRoot || !mQueriesCompiled)
return NS_OK;
// get the containers where content may be inserted. If
// GetInsertionLocations returns false, no container has generated
// any content yet so new content should not be generated either. This
// will be false if the result applies to content that is in a closed menu
// or treeitem for example.
nsAutoPtr<nsCOMArray<nsIContent> > insertionPoints;
bool mayReplace = GetInsertionLocations(aOldResult ? aOldResult : aNewResult,
getter_Transfers(insertionPoints));
if (! mayReplace)
return NS_OK;
nsresult rv = NS_OK;
nsCOMPtr<nsIRDFResource> oldId, newId;
nsTemplateQuerySet* queryset = nullptr;
if (aOldResult) {
rv = GetResultResource(aOldResult, getter_AddRefs(oldId));
if (NS_FAILED(rv))
return rv;
// Ignore re-entrant builds for content that is currently in our
// activation stack.
if (IsActivated(oldId))
return NS_OK;
}
if (aNewResult) {
rv = GetResultResource(aNewResult, getter_AddRefs(newId));
if (NS_FAILED(rv))
return rv;
// skip results that don't have ids
if (! newId)
return NS_OK;
// Ignore re-entrant builds for content that is currently in our
// activation stack.
if (IsActivated(newId))
return NS_OK;
// look for the queryset associated with the supplied query node
nsCOMPtr<nsIContent> querycontent = do_QueryInterface(aQueryNode);
int32_t count = mQuerySets.Length();
for (int32_t q = 0; q < count; q++) {
nsTemplateQuerySet* qs = mQuerySets[q];
if (qs->mQueryNode == querycontent) {
queryset = qs;
break;
}
}
if (! queryset)
return NS_OK;
}
if (insertionPoints) {
// iterate over each insertion point and add or remove the result from
// that container
uint32_t count = insertionPoints->Count();
for (uint32_t t = 0; t < count; t++) {
nsCOMPtr<nsIContent> insertionPoint = insertionPoints->SafeObjectAt(t);
if (insertionPoint) {
rv = UpdateResultInContainer(aOldResult, aNewResult, queryset,
oldId, newId, insertionPoint);
if (NS_FAILED(rv))
return rv;
}
}
}
else {
// The tree builder doesn't use insertion points, so no insertion
// points will be set. In this case, just update the one result.
rv = UpdateResultInContainer(aOldResult, aNewResult, queryset,
oldId, newId, nullptr);
}
return NS_OK;
}
nsresult
nsXULTemplateBuilder::UpdateResultInContainer(nsIXULTemplateResult* aOldResult,
nsIXULTemplateResult* aNewResult,
nsTemplateQuerySet* aQuerySet,
nsIRDFResource* aOldId,
nsIRDFResource* aNewId,
nsIContent* aInsertionPoint)
{
// This method takes a result that no longer applies (aOldResult) and
// replaces it with a new result (aNewResult). Either may be null
// indicating to just remove a result or add a new one without replacing.
//
// Matches are stored in the hashtable mMatchMap, keyed by result id. If
// there is more than one query, or the same id is found in different
// containers, the values in the hashtable will be a linked list of all
// the matches for that id. The matches are sorted according to the
// queries they are associated with. Matches for earlier queries in the
// template take priority over matches from later queries. The priority
// for a match is determined from the match's QuerySetPriority method.
// The first query has a priority 0, and higher numbers are for later
// queries with successively higher priorities. Thus, a match takes
// precedence if it has a lower priority than another. If there is only
// one query or container, then the match doesn't have any linked items.
//
// Matches are nsTemplateMatch objects. They are wrappers around
// nsIXULTemplateResult result objects and are created with
// nsTemplateMatch::Create below. The aQuerySet argument specifies which
// query the match is associated with.
//
// When a result id exists in multiple containers, the match's mContainer
// field is set to the container it corresponds to. The aInsertionPoint
// argument specifies which container is being updated. Even though they
// are stored in the same linked list as other matches of the same id, the
// matches for different containers are treated separately. They are only
// stored in the same hashtable to avoid a more complex data structure, as
// the use of the same id in multiple containers isn't a common occurance.
//
// Only one match with a given id per container is active at a time. When
// a match is active, content is generated for it. When a match is
// inactive, content is not generated for it. A match becomes active if
// another match with the same id and container with a lower priority
// isn't already active, and the match has a rule or conditions clause
// which evaluates to true. The former is checked by comparing the value
// of the QuerySetPriority method of the match with earlier matches. The
// latter is checked with the DetermineMatchedRule method.
//
// Naturally, if a match with a lower priority is active, it overrides
// the new match, so the new match is hooked up into the match linked
// list as inactive, and no content is generated for it. If a match with a
// higher priority is active, and the new match's conditions evaluate
// to true, then this existing match with the higher priority needs to have
// its generated content removed and replaced with the new match's
// generated content.
//
// Similar situations apply when removing an existing match. If the match
// is active, the existing generated content will need to be removed, and
// a match of higher priority that is revealed may become active and need
// to have content generated.
//
// Content removal and generation is done by the ReplaceMatch method which
// is overridden for the content builder and tree builder to update the
// generated output for each type.
//
// The code below handles all of the various cases and ensures that the
// match lists are maintained properly.
nsresult rv = NS_OK;
int16_t ruleindex;
nsTemplateRule* matchedrule = nullptr;
// Indicates that the old match was active and must have its content
// removed
bool oldMatchWasActive = false;
// acceptedmatch will be set to a new match that has to have new content
// generated for it. If a new match doesn't need to have content
// generated, (because for example, a match with a lower priority
// already applies), then acceptedmatch will be null, but the match will
// be still hooked up into the chain, since it may become active later
// as other results are updated.
nsTemplateMatch* acceptedmatch = nullptr;
// When aOldResult is specified, removematch will be set to the
// corresponding match. This match needs to be deleted as it no longer
// applies. However, removedmatch will be null when aOldResult is null, or
// when no match was found corresponding to aOldResult.
nsTemplateMatch* removedmatch = nullptr;
// These will be set when aNewResult is specified indicating to add a
// result, but will end up replacing an existing match. The former
// indicates a match being replaced that was active and had content
// generated for it, while the latter indicates a match that wasn't active
// and just needs to be deleted. Both may point to different matches. For
// example, if the new match becomes active, replacing an inactive match,
// the inactive match will need to be deleted. However, if another match
// with a higher priority is active, the new match will override it, so
// content will need to be generated for the new match and removed for
// this existing active match.
nsTemplateMatch* replacedmatch = nullptr;
nsTemplateMatch* replacedmatchtodelete = nullptr;
if (aOldResult) {
nsTemplateMatch* firstmatch;
if (mMatchMap.Get(aOldId, &firstmatch)) {
nsTemplateMatch* oldmatch = firstmatch;
nsTemplateMatch* prevmatch = nullptr;
// look for the right match if there was more than one
while (oldmatch && (oldmatch->mResult != aOldResult)) {
prevmatch = oldmatch;
oldmatch = oldmatch->mNext;
}
if (oldmatch) {
nsTemplateMatch* findmatch = oldmatch->mNext;
// Keep a reference so that linked list can be hooked up at
// the end in case an error occurs.
nsTemplateMatch* nextmatch = findmatch;
if (oldmatch->IsActive()) {
// Indicate that the old match was active so its content
// will be removed later.
oldMatchWasActive = true;
// The match being removed is the active match, so scan
// through the later matches to determine if one should
// now become the active match.
while (findmatch) {
// only other matches with the same container should
// now match, leave other containers alone
if (findmatch->GetContainer() == aInsertionPoint) {
nsTemplateQuerySet* qs =
mQuerySets[findmatch->QuerySetPriority()];
DetermineMatchedRule(aInsertionPoint, findmatch->mResult,
qs, &matchedrule, &ruleindex);
if (matchedrule) {
rv = findmatch->RuleMatched(qs,
matchedrule, ruleindex,
findmatch->mResult);
if (NS_FAILED(rv))
return rv;
acceptedmatch = findmatch;
break;
}
}
findmatch = findmatch->mNext;
}
}
if (oldmatch == firstmatch) {
// the match to remove is at the beginning
if (oldmatch->mNext) {
mMatchMap.Put(aOldId, oldmatch->mNext);
}
else {
mMatchMap.Remove(aOldId);
}
}
if (prevmatch)
prevmatch->mNext = nextmatch;
removedmatch = oldmatch;
if (mFlags & eLoggingEnabled)
OutputMatchToLog(aOldId, removedmatch, false);
}
}
}
nsTemplateMatch *newmatch = nullptr;
if (aNewResult) {
// only allow a result to be inserted into containers with a matching tag
nsIAtom* tag = aQuerySet->GetTag();
if (aInsertionPoint && tag && tag != aInsertionPoint->Tag())
return NS_OK;
int32_t findpriority = aQuerySet->Priority();
newmatch = nsTemplateMatch::Create(findpriority,
aNewResult, aInsertionPoint);
if (!newmatch)
return NS_ERROR_OUT_OF_MEMORY;
nsTemplateMatch* firstmatch;
if (mMatchMap.Get(aNewId, &firstmatch)) {
bool hasEarlierActiveMatch = false;
// Scan through the existing matches to find where the new one
// should be inserted. oldmatch will be set to the old match for
// the same query and prevmatch will be set to the match before it.
nsTemplateMatch* prevmatch = nullptr;
nsTemplateMatch* oldmatch = firstmatch;
while (oldmatch) {
// Break out once we've reached a query in the list with a
// lower priority. The new match will be inserted at this
// location so that the match list is sorted by priority.
int32_t priority = oldmatch->QuerySetPriority();
if (priority > findpriority) {
oldmatch = nullptr;
break;
}
// look for matches that belong in the same container
if (oldmatch->GetContainer() == aInsertionPoint) {
if (priority == findpriority)
break;
// If a match with a lower priority is active, the new
// match can't replace it.
if (oldmatch->IsActive())
hasEarlierActiveMatch = true;
}
prevmatch = oldmatch;
oldmatch = oldmatch->mNext;
}
// At this point, oldmatch will either be null, or set to a match
// with the same container and priority. If set, oldmatch will
// need to be replaced by newmatch.
if (oldmatch)
newmatch->mNext = oldmatch->mNext;
else if (prevmatch)
newmatch->mNext = prevmatch->mNext;
else
newmatch->mNext = firstmatch;
// hasEarlierActiveMatch will be set to true if a match with a
// lower priority was found. The new match won't replace it in
// this case. If hasEarlierActiveMatch is false, then the new match
// may be become active if it matches one of the rules, and will
// generate output. It's also possible however, that a match with
// the same priority already exists, which means that the new match
// will replace the old one. In this case, oldmatch will be set to
// the old match. The content for the old match must be removed and
// content for the new match generated in its place.
if (! hasEarlierActiveMatch) {
// If the old match was the active match, set replacedmatch to
// indicate that it needs its content removed.
if (oldmatch) {
if (oldmatch->IsActive())
replacedmatch = oldmatch;
replacedmatchtodelete = oldmatch;
}
// check if the new result matches the rules
rv = DetermineMatchedRule(aInsertionPoint, newmatch->mResult,
aQuerySet, &matchedrule, &ruleindex);
if (NS_FAILED(rv)) {
nsTemplateMatch::Destroy(newmatch, false);
return rv;
}
if (matchedrule) {
rv = newmatch->RuleMatched(aQuerySet,
matchedrule, ruleindex,
newmatch->mResult);
if (NS_FAILED(rv)) {
nsTemplateMatch::Destroy(newmatch, false);
return rv;
}
// acceptedmatch may have been set in the block handling
// aOldResult earlier. If so, we would only get here when
// that match has a higher priority than this new match.
// As only one match can have content generated for it, it
// is OK to set acceptedmatch here to the new match,
// ignoring the other one.
acceptedmatch = newmatch;
// Clear the matched state of the later results for the
// same container.
nsTemplateMatch* clearmatch = newmatch->mNext;
while (clearmatch) {
if (clearmatch->GetContainer() == aInsertionPoint &&
clearmatch->IsActive()) {
clearmatch->SetInactive();
// Replacedmatch should be null here. If not, it
// means that two matches were active which isn't
// a valid state
NS_ASSERTION(!replacedmatch,
"replaced match already set");
replacedmatch = clearmatch;
break;
}
clearmatch = clearmatch->mNext;
}
}
else if (oldmatch && oldmatch->IsActive()) {
// The result didn't match the rules, so look for a later
// one. However, only do this if the old match was the
// active match.
newmatch = newmatch->mNext;
while (newmatch) {
if (newmatch->GetContainer() == aInsertionPoint) {
rv = DetermineMatchedRule(aInsertionPoint, newmatch->mResult,
aQuerySet, &matchedrule, &ruleindex);
if (NS_FAILED(rv)) {
nsTemplateMatch::Destroy(newmatch, false);
return rv;
}
if (matchedrule) {
rv = newmatch->RuleMatched(aQuerySet,
matchedrule, ruleindex,
newmatch->mResult);
if (NS_FAILED(rv)) {
nsTemplateMatch::Destroy(newmatch, false);
return rv;
}
acceptedmatch = newmatch;
break;
}
}
newmatch = newmatch->mNext;
}
}
// put the match in the map if there isn't a previous match
if (! prevmatch) {
mMatchMap.Put(aNewId, newmatch);
}
}
// hook up the match last in case an error occurs
if (prevmatch)
prevmatch->mNext = newmatch;
}
else {
// The id is not used in the hashtable yet so create a new match
// and add it to the hashtable.
rv = DetermineMatchedRule(aInsertionPoint, aNewResult,
aQuerySet, &matchedrule, &ruleindex);
if (NS_FAILED(rv)) {
nsTemplateMatch::Destroy(newmatch, false);
return rv;
}
if (matchedrule) {
rv = newmatch->RuleMatched(aQuerySet, matchedrule,
ruleindex, aNewResult);
if (NS_FAILED(rv)) {
nsTemplateMatch::Destroy(newmatch, false);
return rv;
}
acceptedmatch = newmatch;
}
mMatchMap.Put(aNewId, newmatch);
}
}
// The ReplaceMatch method is builder specific and removes the generated
// content for a match.
// Remove the content for a match that was active and needs to be replaced.
if (replacedmatch) {
rv = ReplaceMatch(replacedmatch->mResult, nullptr, nullptr,
aInsertionPoint);
if (mFlags & eLoggingEnabled)
OutputMatchToLog(aNewId, replacedmatch, false);
}
// remove a match that needs to be deleted.
if (replacedmatchtodelete)
nsTemplateMatch::Destroy(replacedmatchtodelete, true);
// If the old match was active, the content for it needs to be removed.
// If the old match was not active, it shouldn't have had any content,
// so just pass null to ReplaceMatch. If acceptedmatch was set, then
// content needs to be generated for a new match.
if (oldMatchWasActive || acceptedmatch)
rv = ReplaceMatch(oldMatchWasActive ? aOldResult : nullptr,
acceptedmatch, matchedrule, aInsertionPoint);
// delete the old match that was replaced
if (removedmatch)
nsTemplateMatch::Destroy(removedmatch, true);
if (mFlags & eLoggingEnabled && newmatch)
OutputMatchToLog(aNewId, newmatch, true);
return rv;
}
NS_IMETHODIMP
nsXULTemplateBuilder::ResultBindingChanged(nsIXULTemplateResult* aResult)
{
// A binding update is used when only the values of the bindings have
// changed, so the same rule still applies. Just synchronize the content.
// The new result will have the new values.
NS_ENSURE_ARG_POINTER(aResult);
if (!mRoot || !mQueriesCompiled)
return NS_OK;
return SynchronizeResult(aResult);
}
NS_IMETHODIMP
nsXULTemplateBuilder::GetRootResult(nsIXULTemplateResult** aResult)
{
*aResult = mRootResult;
NS_IF_ADDREF(*aResult);
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::GetResultForId(const nsAString& aId,
nsIXULTemplateResult** aResult)
{
if (aId.IsEmpty())
return NS_ERROR_INVALID_ARG;
nsCOMPtr<nsIRDFResource> resource;
gRDFService->GetUnicodeResource(aId, getter_AddRefs(resource));
*aResult = nullptr;
nsTemplateMatch* match;
if (mMatchMap.Get(resource, &match)) {
// find the active match
while (match) {
if (match->IsActive()) {
*aResult = match->mResult;
NS_IF_ADDREF(*aResult);
break;
}
match = match->mNext;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::GetResultForContent(nsIDOMElement* aContent,
nsIXULTemplateResult** aResult)
{
*aResult = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::AddListener(nsIXULBuilderListener* aListener)
{
NS_ENSURE_ARG(aListener);
if (!mListeners.AppendObject(aListener))
return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::RemoveListener(nsIXULBuilderListener* aListener)
{
NS_ENSURE_ARG(aListener);
mListeners.RemoveObject(aListener);
return NS_OK;
}
NS_IMETHODIMP
nsXULTemplateBuilder::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
// Uuuuber hack to clean up circular references that the cycle collector
// doesn't know about. See bug 394514.
if (!strcmp(aTopic, DOM_WINDOW_DESTROYED_TOPIC)) {
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aSubject);
if (window) {
nsCOMPtr<nsIDocument> doc = window->GetExtantDoc();
if (doc && doc == mObservedDocument)
NodeWillBeDestroyed(doc);
}
}
return NS_OK;
}
//----------------------------------------------------------------------
//
// nsIDocumentOberver interface
//
void
nsXULTemplateBuilder::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aElement == mRoot && aNameSpaceID == kNameSpaceID_None) {
// Check for a change to the 'ref' attribute on an atom, in which
// case we may need to nuke and rebuild the entire content model
// beneath the element.
if (aAttribute == nsGkAtoms::ref)
nsContentUtils::AddScriptRunner(
NS_NewRunnableMethod(this, &nsXULTemplateBuilder::RunnableRebuild));
// Check for a change to the 'datasources' attribute. If so, setup
// mDB by parsing the new value and rebuild.
else if (aAttribute == nsGkAtoms::datasources) {
nsContentUtils::AddScriptRunner(
NS_NewRunnableMethod(this, &nsXULTemplateBuilder::RunnableLoadAndRebuild));
}
}
}
void
nsXULTemplateBuilder::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
if (mRoot && nsContentUtils::ContentIsDescendantOf(mRoot, aChild)) {
nsRefPtr<nsXULTemplateBuilder> kungFuDeathGrip(this);
if (mQueryProcessor)
mQueryProcessor->Done();
// Pass false to Uninit since content is going away anyway
nsContentUtils::AddScriptRunner(
NS_NewRunnableMethod(this, &nsXULTemplateBuilder::UninitFalse));
MOZ_ASSERT(aDocument == mObservedDocument);
StopObserving();
nsCOMPtr<nsIXULDocument> xuldoc = do_QueryInterface(aDocument);
if (xuldoc)
xuldoc->SetTemplateBuilderFor(mRoot, nullptr);
// clear the template state when removing content so that template
// content will be regenerated again if the content is reinserted
nsXULElement *xulcontent = nsXULElement::FromContent(mRoot);
if (xulcontent)
xulcontent->ClearTemplateGenerated();
CleanUp(true);
mDB = nullptr;
mCompDB = nullptr;
mDataSource = nullptr;
}
}
void
nsXULTemplateBuilder::NodeWillBeDestroyed(const nsINode* aNode)
{
// The call to RemoveObserver could release the last reference to
// |this|, so hold another reference.
nsRefPtr<nsXULTemplateBuilder> kungFuDeathGrip(this);
// Break circular references
if (mQueryProcessor)
mQueryProcessor->Done();
mDataSource = nullptr;
mDB = nullptr;
mCompDB = nullptr;
nsContentUtils::AddScriptRunner(
NS_NewRunnableMethod(this, &nsXULTemplateBuilder::UninitTrue));
}
//----------------------------------------------------------------------
//
// Implementation methods
//
nsresult
nsXULTemplateBuilder::LoadDataSources(nsIDocument* aDocument,
bool* aShouldDelayBuilding)
{
NS_PRECONDITION(mRoot != nullptr, "not initialized");
nsresult rv;
bool isRDFQuery = false;
// we'll set these again later, after we create a new composite ds
mDB = nullptr;
mCompDB = nullptr;
mDataSource = nullptr;
*aShouldDelayBuilding = false;
nsAutoString datasources;
mRoot->GetAttr(kNameSpaceID_None, nsGkAtoms::datasources, datasources);
nsAutoString querytype;
mRoot->GetAttr(kNameSpaceID_None, nsGkAtoms::querytype, querytype);
// create the query processor. The querytype attribute on the root element
// may be used to create one of a specific type.
// XXX should non-chrome be restricted to specific names?
if (querytype.IsEmpty())
querytype.AssignLiteral("rdf");
if (querytype.EqualsLiteral("rdf")) {
isRDFQuery = true;
mQueryProcessor = new nsXULTemplateQueryProcessorRDF();
NS_ENSURE_TRUE(mQueryProcessor, NS_ERROR_OUT_OF_MEMORY);
}
else if (querytype.EqualsLiteral("xml")) {
mQueryProcessor = new nsXULTemplateQueryProcessorXML();
NS_ENSURE_TRUE(mQueryProcessor, NS_ERROR_OUT_OF_MEMORY);
}
else if (querytype.EqualsLiteral("storage")) {
mQueryProcessor = new nsXULTemplateQueryProcessorStorage();
NS_ENSURE_TRUE(mQueryProcessor, NS_ERROR_OUT_OF_MEMORY);
}
else {
nsAutoCString cid(NS_QUERY_PROCESSOR_CONTRACTID_PREFIX);
AppendUTF16toUTF8(querytype, cid);
mQueryProcessor = do_CreateInstance(cid.get(), &rv);
if (!mQueryProcessor) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_INVALID_QUERYPROCESSOR);
return rv;
}
}
rv = LoadDataSourceUrls(aDocument, datasources,
isRDFQuery, aShouldDelayBuilding);
NS_ENSURE_SUCCESS(rv, rv);
// Now set the database on the element, so that script writers can
// access it.
nsCOMPtr<nsIXULDocument> xuldoc = do_QueryInterface(aDocument);
if (xuldoc)
xuldoc->SetTemplateBuilderFor(mRoot, this);
if (!mRoot->IsXUL()) {
// Hmm. This must be an HTML element. Try to set it as a
// JS property "by hand".
InitHTMLTemplateRoot();
}
return NS_OK;
}
nsresult
nsXULTemplateBuilder::LoadDataSourceUrls(nsIDocument* aDocument,
const nsAString& aDataSources,
bool aIsRDFQuery,
bool* aShouldDelayBuilding)
{
// Grab the doc's principal...
nsIPrincipal *docPrincipal = aDocument->NodePrincipal();
NS_ASSERTION(docPrincipal == mRoot->NodePrincipal(),
"Principal mismatch? Which one to use?");
bool isTrusted = false;
nsresult rv = IsSystemPrincipal(docPrincipal, &isTrusted);
NS_ENSURE_SUCCESS(rv, rv);
// Parse datasources: they are assumed to be a whitespace
// separated list of URIs; e.g.,
//
// rdf:bookmarks rdf:history http://foo.bar.com/blah.cgi?baz=9
//
nsIURI *docurl = aDocument->GetDocumentURI();
nsCOMPtr<nsIMutableArray> uriList = do_CreateInstance(NS_ARRAY_CONTRACTID);
if (!uriList)
return NS_ERROR_FAILURE;
nsAutoString datasources(aDataSources);
uint32_t first = 0;
while (1) {
while (first < datasources.Length() && nsCRT::IsAsciiSpace(datasources.CharAt(first)))
++first;
if (first >= datasources.Length())
break;
uint32_t last = first;
while (last < datasources.Length() && !nsCRT::IsAsciiSpace(datasources.CharAt(last)))
++last;
nsAutoString uriStr;
datasources.Mid(uriStr, first, last - first);
first = last + 1;
// A special 'dummy' datasource
if (uriStr.EqualsLiteral("rdf:null"))
continue;
if (uriStr.CharAt(0) == '#') {
// ok, the datasource is certainly a node of the current document
nsCOMPtr<nsIDOMDocument> domdoc = do_QueryInterface(aDocument);
nsCOMPtr<nsIDOMElement> dsnode;
domdoc->GetElementById(Substring(uriStr, 1),
getter_AddRefs(dsnode));
if (dsnode)
uriList->AppendElement(dsnode, false);
continue;
}
// N.B. that `failure' (e.g., because it's an unknown
// protocol) leaves uriStr unaltered.
NS_MakeAbsoluteURI(uriStr, uriStr, docurl);
nsCOMPtr<nsIURI> uri;
rv = NS_NewURI(getter_AddRefs(uri), uriStr);
if (NS_FAILED(rv) || !uri)
continue; // Necko will barf if our URI is weird
// don't add the uri to the list if the document is not allowed to
// load it
if (!isTrusted && NS_FAILED(docPrincipal->CheckMayLoad(uri, true, false)))
continue;
uriList->AppendElement(uri, false);
}
nsCOMPtr<nsIDOMNode> rootNode = do_QueryInterface(mRoot);
rv = mQueryProcessor->GetDatasource(uriList,
rootNode,
isTrusted,
this,
aShouldDelayBuilding,
getter_AddRefs(mDataSource));
NS_ENSURE_SUCCESS(rv, rv);
if (aIsRDFQuery && mDataSource) {
// check if we were given an inference engine type
nsCOMPtr<nsIRDFInferDataSource> inferDB = do_QueryInterface(mDataSource);
if (inferDB) {
nsCOMPtr<nsIRDFDataSource> ds;
inferDB->GetBaseDataSource(getter_AddRefs(ds));
if (ds)
mCompDB = do_QueryInterface(ds);
}
if (!mCompDB)
mCompDB = do_QueryInterface(mDataSource);
mDB = do_QueryInterface(mDataSource);
}
if (!mDB && isTrusted) {
gRDFService->GetDataSource("rdf:local-store", getter_AddRefs(mDB));
}
return NS_OK;
}
nsresult
nsXULTemplateBuilder::InitHTMLTemplateRoot()
{
// Use XPConnect and the JS APIs to whack mDB and this as the
// 'database' and 'builder' properties onto aElement.
nsresult rv;
nsCOMPtr<nsIDocument> doc = mRoot->GetComposedDoc();
NS_ASSERTION(doc, "no document");
if (! doc)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIScriptGlobalObject> global =
do_QueryInterface(doc->GetWindow());
if (! global)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIGlobalObject> innerWin =
do_QueryInterface(doc->GetInnerWindow());
// We are going to run script via JS_SetProperty, so we need a script entry
// point, but as this is XUL related it does not appear in the HTML spec.
AutoEntryScript entryScript(innerWin, true);
JSContext* jscontext = entryScript.cx();
JS::Rooted<JS::Value> v(jscontext);
rv = nsContentUtils::WrapNative(jscontext, mRoot, mRoot, &v);
NS_ENSURE_SUCCESS(rv, rv);
JS::Rooted<JSObject*> jselement(jscontext, v.toObjectOrNull());
if (mDB) {
// database
JS::Rooted<JS::Value> jsdatabase(jscontext);
rv = nsContentUtils::WrapNative(jscontext, mDB,
&NS_GET_IID(nsIRDFCompositeDataSource),
&jsdatabase);
NS_ENSURE_SUCCESS(rv, rv);
bool ok = JS_SetProperty(jscontext, jselement, "database", jsdatabase);
NS_ASSERTION(ok, "unable to set database property");
if (! ok)
return NS_ERROR_FAILURE;
}
{
// builder
JS::Rooted<JS::Value> jsbuilder(jscontext);
rv = nsContentUtils::WrapNative(jscontext,
static_cast<nsIXULTemplateBuilder*>(this),
&NS_GET_IID(nsIXULTemplateBuilder),
&jsbuilder);
NS_ENSURE_SUCCESS(rv, rv);
bool ok = JS_SetProperty(jscontext, jselement, "builder", jsbuilder);
if (! ok)
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
nsXULTemplateBuilder::DetermineMatchedRule(nsIContent *aContainer,
nsIXULTemplateResult* aResult,
nsTemplateQuerySet* aQuerySet,
nsTemplateRule** aMatchedRule,
int16_t *aRuleIndex)
{
// iterate through the rules and look for one that the result matches
int16_t count = aQuerySet->RuleCount();
for (int16_t r = 0; r < count; r++) {
nsTemplateRule* rule = aQuerySet->GetRuleAt(r);
// If a tag was specified, it must match the tag of the container
// where content is being inserted.
nsIAtom* tag = rule->GetTag();
if ((!aContainer || !tag || tag == aContainer->Tag()) &&
rule->CheckMatch(aResult)) {
*aMatchedRule = rule;
*aRuleIndex = r;
return NS_OK;
}
}
*aRuleIndex = -1;
*aMatchedRule = nullptr;
return NS_OK;
}
void
nsXULTemplateBuilder::ParseAttribute(const nsAString& aAttributeValue,
void (*aVariableCallback)(nsXULTemplateBuilder*, const nsAString&, void*),
void (*aTextCallback)(nsXULTemplateBuilder*, const nsAString&, void*),
void* aClosure)
{
nsAString::const_iterator done_parsing;
aAttributeValue.EndReading(done_parsing);
nsAString::const_iterator iter;
aAttributeValue.BeginReading(iter);
nsAString::const_iterator mark(iter), backup(iter);
for (; iter != done_parsing; backup = ++iter) {
// A variable is either prefixed with '?' (in the extended
// syntax) or "rdf:" (in the simple syntax).
bool isvar;
if (*iter == char16_t('?') && (++iter != done_parsing)) {
isvar = true;
}
else if ((*iter == char16_t('r') && (++iter != done_parsing)) &&
(*iter == char16_t('d') && (++iter != done_parsing)) &&
(*iter == char16_t('f') && (++iter != done_parsing)) &&
(*iter == char16_t(':') && (++iter != done_parsing))) {
isvar = true;
}
else {
isvar = false;
}
if (! isvar) {
// It's not a variable, or we ran off the end of the
// string after the initial variable prefix. Since we may
// have slurped down some characters before realizing that
// fact, back up to the point where we started.
iter = backup;
continue;
}
else if (backup != mark && aTextCallback) {
// Okay, we've found a variable, and there's some vanilla
// text that's been buffered up. Flush it.
(*aTextCallback)(this, Substring(mark, backup), aClosure);
}
if (*iter == char16_t('?')) {
// Well, it was not really a variable, but "??". We use one
// question mark (the second one, actually) literally.
mark = iter;
continue;
}
// Construct a substring that is the symbol we need to look up
// in the rule's symbol table. The symbol is terminated by a
// space character, a caret, or the end of the string,
// whichever comes first.
nsAString::const_iterator first(backup);
char16_t c = 0;
while (iter != done_parsing) {
c = *iter;
if ((c == char16_t(' ')) || (c == char16_t('^')))
break;
++iter;
}
nsAString::const_iterator last(iter);
// Back up so we don't consume the terminating character
// *unless* the terminating character was a caret: the caret
// means "concatenate with no space in between".
if (c != char16_t('^'))
--iter;
(*aVariableCallback)(this, Substring(first, last), aClosure);
mark = iter;
++mark;
}
if (backup != mark && aTextCallback) {
// If there's any text left over, then fire the text callback
(*aTextCallback)(this, Substring(mark, backup), aClosure);
}
}
struct MOZ_STACK_CLASS SubstituteTextClosure {
SubstituteTextClosure(nsIXULTemplateResult* aResult, nsAString& aString)
: result(aResult), str(aString) {}
// some datasources are lazily initialized or modified while values are
// being retrieved, causing results to be removed. Due to this, hold a
// strong reference to the result.
nsCOMPtr<nsIXULTemplateResult> result;
nsAString& str;
};
nsresult
nsXULTemplateBuilder::SubstituteText(nsIXULTemplateResult* aResult,
const nsAString& aAttributeValue,
nsAString& aString)
{
// See if it's the special value "..."
if (aAttributeValue.EqualsLiteral("...")) {
aResult->GetId(aString);
return NS_OK;
}
// Reasonable guess at how big it should be
aString.SetCapacity(aAttributeValue.Length());
SubstituteTextClosure closure(aResult, aString);
ParseAttribute(aAttributeValue,
SubstituteTextReplaceVariable,
SubstituteTextAppendText,
&closure);
return NS_OK;
}
void
nsXULTemplateBuilder::SubstituteTextAppendText(nsXULTemplateBuilder* aThis,
const nsAString& aText,
void* aClosure)
{
// Append aString to the closure's result
SubstituteTextClosure* c = static_cast<SubstituteTextClosure*>(aClosure);
c->str.Append(aText);
}
void
nsXULTemplateBuilder::SubstituteTextReplaceVariable(nsXULTemplateBuilder* aThis,
const nsAString& aVariable,
void* aClosure)
{
// Substitute the value for the variable and append to the
// closure's result.
SubstituteTextClosure* c = static_cast<SubstituteTextClosure*>(aClosure);
nsAutoString replacementText;
// The symbol "rdf:*" is special, and means "this guy's URI"
if (aVariable.EqualsLiteral("rdf:*")){
c->result->GetId(replacementText);
}
else {
// Got a variable; get the value it's assigned to
nsCOMPtr<nsIAtom> var = do_GetAtom(aVariable);
c->result->GetBindingFor(var, replacementText);
}
c->str += replacementText;
}
bool
nsXULTemplateBuilder::IsTemplateElement(nsIContent* aContent)
{
return aContent->NodeInfo()->Equals(nsGkAtoms::_template,
kNameSpaceID_XUL);
}
nsresult
nsXULTemplateBuilder::GetTemplateRoot(nsIContent** aResult)
{
NS_PRECONDITION(mRoot != nullptr, "not initialized");
if (! mRoot)
return NS_ERROR_NOT_INITIALIZED;
// First, check and see if the root has a template attribute. This
// allows a template to be specified "out of line"; e.g.,
//
// <window>
// <foo template="MyTemplate">...</foo>
// <template id="MyTemplate">...</template>
// </window>
//
nsAutoString templateID;
mRoot->GetAttr(kNameSpaceID_None, nsGkAtoms::_template, templateID);
if (! templateID.IsEmpty()) {
nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(mRoot->GetComposedDoc());
if (! domDoc)
return NS_OK;
nsCOMPtr<nsIDOMElement> domElement;
domDoc->GetElementById(templateID, getter_AddRefs(domElement));
if (domElement) {
nsCOMPtr<nsIContent> content = do_QueryInterface(domElement);
NS_ENSURE_STATE(content &&
!nsContentUtils::ContentIsDescendantOf(mRoot,
content));
content.forget(aResult);
return NS_OK;
}
}
// If root node has no template attribute, then look for a child
// node which is a template tag.
for (nsIContent* child = mRoot->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (IsTemplateElement(child)) {
NS_ADDREF(*aResult = child);
return NS_OK;
}
}
// Look through the anonymous children as well. Although FlattenedChildIterator
// will find a template element that has been placed in an insertion point, many
// bindings do not have a specific insertion point for the template element, which
// would cause it to not be part of the flattened content tree. The check above to
// check the explicit children as well handles this case.
FlattenedChildIterator iter(mRoot);
for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
if (IsTemplateElement(child)) {
NS_ADDREF(*aResult = child);
return NS_OK;
}
}
*aResult = nullptr;
return NS_OK;
}
nsresult
nsXULTemplateBuilder::CompileQueries()
{
nsCOMPtr<nsIContent> tmpl;
GetTemplateRoot(getter_AddRefs(tmpl));
if (! tmpl)
return NS_OK;
if (! mRoot)
return NS_ERROR_NOT_INITIALIZED;
// Determine if there are any special settings we need to observe
mFlags = 0;
nsAutoString flags;
mRoot->GetAttr(kNameSpaceID_None, nsGkAtoms::flags, flags);
// if the dont-test-empty flag is set, containers should not be checked to
// see if they are empty. If dont-recurse is set, then don't process the
// template recursively and only show one level of results. The logging
// flag logs errors and results to the console, which is useful when
// debugging templates.
nsWhitespaceTokenizer tokenizer(flags);
while (tokenizer.hasMoreTokens()) {
const nsDependentSubstring& token(tokenizer.nextToken());
if (token.EqualsLiteral("dont-test-empty"))
mFlags |= eDontTestEmpty;
else if (token.EqualsLiteral("dont-recurse"))
mFlags |= eDontRecurse;
else if (token.EqualsLiteral("logging"))
mFlags |= eLoggingEnabled;
}
#ifdef PR_LOGGING
// always enable logging if the debug setting is used
if (PR_LOG_TEST(gXULTemplateLog, PR_LOG_DEBUG))
mFlags |= eLoggingEnabled;
#endif
nsCOMPtr<nsIDOMNode> rootnode = do_QueryInterface(mRoot);
nsresult rv =
mQueryProcessor->InitializeForBuilding(mDataSource, this, rootnode);
if (NS_FAILED(rv))
return rv;
// Set the "container" and "member" variables, if the user has specified
// them. The container variable may be specified with the container
// attribute on the <template> and the member variable may be specified
// using the member attribute or the value of the uri attribute inside the
// first action body in the template. If not specified, the container
// variable defaults to '?uri' and the member variable defaults to '?' or
// 'rdf:*' for simple queries.
// For RDF queries, the container variable may also be set via the
// <content> tag.
nsAutoString containervar;
tmpl->GetAttr(kNameSpaceID_None, nsGkAtoms::container, containervar);
if (containervar.IsEmpty())
mRefVariable = do_GetAtom("?uri");
else
mRefVariable = do_GetAtom(containervar);
nsAutoString membervar;
tmpl->GetAttr(kNameSpaceID_None, nsGkAtoms::member, membervar);
if (membervar.IsEmpty())
mMemberVariable = nullptr;
else
mMemberVariable = do_GetAtom(membervar);
nsTemplateQuerySet* queryset = new nsTemplateQuerySet(0);
if (!queryset)
return NS_ERROR_OUT_OF_MEMORY;
if (!mQuerySets.AppendElement(queryset)) {
delete queryset;
return NS_ERROR_OUT_OF_MEMORY;
}
bool canUseTemplate = false;
int32_t priority = 0;
rv = CompileTemplate(tmpl, queryset, false, &priority, &canUseTemplate);
if (NS_FAILED(rv) || !canUseTemplate) {
for (int32_t q = mQuerySets.Length() - 1; q >= 0; q--) {
nsTemplateQuerySet* qs = mQuerySets[q];
delete qs;
}
mQuerySets.Clear();
}
mQueriesCompiled = true;
return NS_OK;
}
nsresult
nsXULTemplateBuilder::CompileTemplate(nsIContent* aTemplate,
nsTemplateQuerySet* aQuerySet,
bool aIsQuerySet,
int32_t* aPriority,
bool* aCanUseTemplate)
{
NS_ASSERTION(aQuerySet, "No queryset supplied");
nsresult rv = NS_OK;
bool isQuerySetMode = false;
bool hasQuerySet = false, hasRule = false, hasQuery = false;
for (nsIContent* rulenode = aTemplate->GetFirstChild();
rulenode;
rulenode = rulenode->GetNextSibling()) {
mozilla::dom::NodeInfo *ni = rulenode->NodeInfo();
// don't allow more queries than can be supported
if (*aPriority == INT16_MAX)
return NS_ERROR_FAILURE;
// XXXndeakin queryset isn't a good name for this tag since it only
// ever contains one query
if (!aIsQuerySet && ni->Equals(nsGkAtoms::queryset, kNameSpaceID_XUL)) {
if (hasRule || hasQuery) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_INVALID_QUERYSET);
continue;
}
isQuerySetMode = true;
// only create a queryset for those after the first since the
// first one is always created by CompileQueries
if (hasQuerySet) {
aQuerySet = new nsTemplateQuerySet(++*aPriority);
if (!aQuerySet)
return NS_ERROR_OUT_OF_MEMORY;
// once the queryset is appended to the mQuerySets list, it
// will be removed by CompileQueries if an error occurs
if (!mQuerySets.AppendElement(aQuerySet)) {
delete aQuerySet;
return NS_ERROR_OUT_OF_MEMORY;
}
}
hasQuerySet = true;
rv = CompileTemplate(rulenode, aQuerySet, true, aPriority, aCanUseTemplate);
if (NS_FAILED(rv))
return rv;
}
// once a queryset is used, everything must be a queryset
if (isQuerySetMode)
continue;
if (ni->Equals(nsGkAtoms::rule, kNameSpaceID_XUL)) {
nsCOMPtr<nsIContent> action;
nsXULContentUtils::FindChildByTag(rulenode,
kNameSpaceID_XUL,
nsGkAtoms::action,
getter_AddRefs(action));
if (action){
nsCOMPtr<nsIAtom> memberVariable = mMemberVariable;
if (!memberVariable) {
memberVariable = DetermineMemberVariable(action);
if (!memberVariable) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_NO_MEMBERVAR);
continue;
}
}
if (hasQuery) {
nsCOMPtr<nsIAtom> tag;
DetermineRDFQueryRef(aQuerySet->mQueryNode,
getter_AddRefs(tag));
if (tag)
aQuerySet->SetTag(tag);
if (! aQuerySet->mCompiledQuery) {
nsCOMPtr<nsIDOMNode> query(do_QueryInterface(aQuerySet->mQueryNode));
rv = mQueryProcessor->CompileQuery(this, query,
mRefVariable, memberVariable,
getter_AddRefs(aQuerySet->mCompiledQuery));
if (NS_FAILED(rv))
return rv;
}
if (aQuerySet->mCompiledQuery) {
rv = CompileExtendedQuery(rulenode, action, memberVariable,
aQuerySet);
if (NS_FAILED(rv))
return rv;
*aCanUseTemplate = true;
}
}
else {
// backwards-compatible RDF template syntax where there is
// an <action> node but no <query> node. In this case,
// use the conditions as if it was the query.
nsCOMPtr<nsIContent> conditions;
nsXULContentUtils::FindChildByTag(rulenode,
kNameSpaceID_XUL,
nsGkAtoms::conditions,
getter_AddRefs(conditions));
if (conditions) {
// create a new queryset if one hasn't been created already
if (hasQuerySet) {
aQuerySet = new nsTemplateQuerySet(++*aPriority);
if (! aQuerySet)
return NS_ERROR_OUT_OF_MEMORY;
if (!mQuerySets.AppendElement(aQuerySet)) {
delete aQuerySet;
return NS_ERROR_OUT_OF_MEMORY;
}
}
nsCOMPtr<nsIAtom> tag;
DetermineRDFQueryRef(conditions, getter_AddRefs(tag));
if (tag)
aQuerySet->SetTag(tag);
hasQuerySet = true;
nsCOMPtr<nsIDOMNode> conditionsnode(do_QueryInterface(conditions));
aQuerySet->mQueryNode = conditions;
rv = mQueryProcessor->CompileQuery(this, conditionsnode,
mRefVariable,
memberVariable,
getter_AddRefs(aQuerySet->mCompiledQuery));
if (NS_FAILED(rv))
return rv;
if (aQuerySet->mCompiledQuery) {
rv = CompileExtendedQuery(rulenode, action, memberVariable,
aQuerySet);
if (NS_FAILED(rv))
return rv;
*aCanUseTemplate = true;
}
}
}
}
else {
if (hasQuery)
continue;
// a new queryset must always be created in this case
if (hasQuerySet) {
aQuerySet = new nsTemplateQuerySet(++*aPriority);
if (! aQuerySet)
return NS_ERROR_OUT_OF_MEMORY;
if (!mQuerySets.AppendElement(aQuerySet)) {
delete aQuerySet;
return NS_ERROR_OUT_OF_MEMORY;
}
}
hasQuerySet = true;
rv = CompileSimpleQuery(rulenode, aQuerySet, aCanUseTemplate);
if (NS_FAILED(rv))
return rv;
}
hasRule = true;
}
else if (ni->Equals(nsGkAtoms::query, kNameSpaceID_XUL)) {
if (hasQuery)
continue;
aQuerySet->mQueryNode = rulenode;
hasQuery = true;
}
else if (ni->Equals(nsGkAtoms::action, kNameSpaceID_XUL)) {
// the query must appear before the action
if (! hasQuery)
continue;
nsCOMPtr<nsIAtom> tag;
DetermineRDFQueryRef(aQuerySet->mQueryNode, getter_AddRefs(tag));
if (tag)
aQuerySet->SetTag(tag);
nsCOMPtr<nsIAtom> memberVariable = mMemberVariable;
if (!memberVariable) {
memberVariable = DetermineMemberVariable(rulenode);
if (!memberVariable) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_NO_MEMBERVAR);
continue;
}
}
nsCOMPtr<nsIDOMNode> query(do_QueryInterface(aQuerySet->mQueryNode));
rv = mQueryProcessor->CompileQuery(this, query,
mRefVariable, memberVariable,
getter_AddRefs(aQuerySet->mCompiledQuery));
if (aQuerySet->mCompiledQuery) {
nsTemplateRule* rule = aQuerySet->NewRule(aTemplate, rulenode, aQuerySet);
if (! rule)
return NS_ERROR_OUT_OF_MEMORY;
rule->SetVars(mRefVariable, memberVariable);
*aCanUseTemplate = true;
return NS_OK;
}
}
}
if (! hasRule && ! hasQuery && ! hasQuerySet) {
// if no rules are specified in the template, then the contents of the
// <template> tag are the one-and-only template.
rv = CompileSimpleQuery(aTemplate, aQuerySet, aCanUseTemplate);
}
return rv;
}
nsresult
nsXULTemplateBuilder::CompileExtendedQuery(nsIContent* aRuleElement,
nsIContent* aActionElement,
nsIAtom* aMemberVariable,
nsTemplateQuerySet* aQuerySet)
{
// Compile an "extended" <template> rule. An extended rule may have
// a <conditions> child, an <action> child, and a <bindings> child.
nsresult rv;
nsTemplateRule* rule = aQuerySet->NewRule(aRuleElement, aActionElement, aQuerySet);
if (! rule)
return NS_ERROR_OUT_OF_MEMORY;
nsCOMPtr<nsIContent> conditions;
nsXULContentUtils::FindChildByTag(aRuleElement,
kNameSpaceID_XUL,
nsGkAtoms::conditions,
getter_AddRefs(conditions));
// allow the conditions to be placed directly inside the rule
if (!conditions)
conditions = aRuleElement;
rv = CompileConditions(rule, conditions);
// If the rule compilation failed, then we have to bail.
if (NS_FAILED(rv)) {
aQuerySet->RemoveRule(rule);
return rv;
}
rule->SetVars(mRefVariable, aMemberVariable);
// If we've got bindings, add 'em.
nsCOMPtr<nsIContent> bindings;
nsXULContentUtils::FindChildByTag(aRuleElement,
kNameSpaceID_XUL,
nsGkAtoms::bindings,
getter_AddRefs(bindings));
// allow bindings to be placed directly inside rule
if (!bindings)
bindings = aRuleElement;
rv = CompileBindings(rule, bindings);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
already_AddRefed<nsIAtom>
nsXULTemplateBuilder::DetermineMemberVariable(nsIContent* aElement)
{
// recursively iterate over the children looking for an element
// with uri="?..."
for (nsIContent* child = aElement->GetFirstChild();
child;
child = child->GetNextSibling()) {
nsAutoString uri;
child->GetAttr(kNameSpaceID_None, nsGkAtoms::uri, uri);
if (!uri.IsEmpty() && uri[0] == char16_t('?')) {
return NS_NewAtom(uri);
}
nsCOMPtr<nsIAtom> result = DetermineMemberVariable(child);
if (result) {
return result.forget();
}
}
return nullptr;
}
void
nsXULTemplateBuilder::DetermineRDFQueryRef(nsIContent* aQueryElement, nsIAtom** aTag)
{
// check for a tag
nsCOMPtr<nsIContent> content;
nsXULContentUtils::FindChildByTag(aQueryElement,
kNameSpaceID_XUL,
nsGkAtoms::content,
getter_AddRefs(content));
if (! content) {
// look for older treeitem syntax as well
nsXULContentUtils::FindChildByTag(aQueryElement,
kNameSpaceID_XUL,
nsGkAtoms::treeitem,
getter_AddRefs(content));
}
if (content) {
nsAutoString uri;
content->GetAttr(kNameSpaceID_None, nsGkAtoms::uri, uri);
if (!uri.IsEmpty())
mRefVariable = do_GetAtom(uri);
nsAutoString tag;
content->GetAttr(kNameSpaceID_None, nsGkAtoms::tag, tag);
if (!tag.IsEmpty())
*aTag = NS_NewAtom(tag).take();
}
}
nsresult
nsXULTemplateBuilder::CompileSimpleQuery(nsIContent* aRuleElement,
nsTemplateQuerySet* aQuerySet,
bool* aCanUseTemplate)
{
// compile a simple query, which is a query with no <query> or
// <conditions>. This means that a default query is used.
nsCOMPtr<nsIDOMNode> query(do_QueryInterface(aRuleElement));
nsCOMPtr<nsIAtom> memberVariable;
if (mMemberVariable)
memberVariable = mMemberVariable;
else
memberVariable = do_GetAtom("rdf:*");
// since there is no <query> node for a simple query, the query node will
// be either the <rule> node if multiple rules are used, or the <template> node.
aQuerySet->mQueryNode = aRuleElement;
nsresult rv = mQueryProcessor->CompileQuery(this, query,
mRefVariable, memberVariable,
getter_AddRefs(aQuerySet->mCompiledQuery));
if (NS_FAILED(rv))
return rv;
if (! aQuerySet->mCompiledQuery) {
*aCanUseTemplate = false;
return NS_OK;
}
nsTemplateRule* rule = aQuerySet->NewRule(aRuleElement, aRuleElement, aQuerySet);
if (! rule)
return NS_ERROR_OUT_OF_MEMORY;
rule->SetVars(mRefVariable, memberVariable);
nsAutoString tag;
aRuleElement->GetAttr(kNameSpaceID_None, nsGkAtoms::parent, tag);
if (!tag.IsEmpty()) {
nsCOMPtr<nsIAtom> tagatom = do_GetAtom(tag);
aQuerySet->SetTag(tagatom);
}
*aCanUseTemplate = true;
return AddSimpleRuleBindings(rule, aRuleElement);
}
nsresult
nsXULTemplateBuilder::CompileConditions(nsTemplateRule* aRule,
nsIContent* aCondition)
{
nsAutoString tag;
aCondition->GetAttr(kNameSpaceID_None, nsGkAtoms::parent, tag);
if (!tag.IsEmpty()) {
nsCOMPtr<nsIAtom> tagatom = do_GetAtom(tag);
aRule->SetTag(tagatom);
}
nsTemplateCondition* currentCondition = nullptr;
for (nsIContent* node = aCondition->GetFirstChild();
node;
node = node->GetNextSibling()) {
if (node->NodeInfo()->Equals(nsGkAtoms::where, kNameSpaceID_XUL)) {
nsresult rv = CompileWhereCondition(aRule, node, &currentCondition);
if (NS_FAILED(rv))
return rv;
}
}
return NS_OK;
}
nsresult
nsXULTemplateBuilder::CompileWhereCondition(nsTemplateRule* aRule,
nsIContent* aCondition,
nsTemplateCondition** aCurrentCondition)
{
// Compile a <where> condition, which must be of the form:
//
// <where subject="?var1|string" rel="relation" value="?var2|string" />
//
// The value of rel may be:
// equal - subject must be equal to object
// notequal - subject must not be equal to object
// less - subject must be less than object
// greater - subject must be greater than object
// startswith - subject must start with object
// endswith - subject must end with object
// contains - subject must contain object
// Comparisons are done as strings unless the subject is an integer.
// subject
nsAutoString subject;
aCondition->GetAttr(kNameSpaceID_None, nsGkAtoms::subject, subject);
if (subject.IsEmpty()) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_WHERE_NO_SUBJECT);
return NS_OK;
}
nsCOMPtr<nsIAtom> svar;
if (subject[0] == char16_t('?'))
svar = do_GetAtom(subject);
nsAutoString relstring;
aCondition->GetAttr(kNameSpaceID_None, nsGkAtoms::rel, relstring);
if (relstring.IsEmpty()) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_WHERE_NO_RELATION);
return NS_OK;
}
// object
nsAutoString value;
aCondition->GetAttr(kNameSpaceID_None, nsGkAtoms::value, value);
if (value.IsEmpty()) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_WHERE_NO_VALUE);
return NS_OK;
}
// multiple
bool shouldMultiple =
aCondition->AttrValueIs(kNameSpaceID_None, nsGkAtoms::multiple,
nsGkAtoms::_true, eCaseMatters);
nsCOMPtr<nsIAtom> vvar;
if (!shouldMultiple && (value[0] == char16_t('?'))) {
vvar = do_GetAtom(value);
}
// ignorecase
bool shouldIgnoreCase =
aCondition->AttrValueIs(kNameSpaceID_None, nsGkAtoms::ignorecase,
nsGkAtoms::_true, eCaseMatters);
// negate
bool shouldNegate =
aCondition->AttrValueIs(kNameSpaceID_None, nsGkAtoms::negate,
nsGkAtoms::_true, eCaseMatters);
nsTemplateCondition* condition;
if (svar && vvar) {
condition = new nsTemplateCondition(svar, relstring, vvar,
shouldIgnoreCase, shouldNegate);
}
else if (svar && !value.IsEmpty()) {
condition = new nsTemplateCondition(svar, relstring, value,
shouldIgnoreCase, shouldNegate, shouldMultiple);
}
else if (vvar) {
condition = new nsTemplateCondition(subject, relstring, vvar,
shouldIgnoreCase, shouldNegate);
}
else {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_WHERE_NO_VAR);
return NS_OK;
}
if (! condition)
return NS_ERROR_OUT_OF_MEMORY;
if (*aCurrentCondition) {
(*aCurrentCondition)->SetNext(condition);
}
else {
aRule->SetCondition(condition);
}
*aCurrentCondition = condition;
return NS_OK;
}
nsresult
nsXULTemplateBuilder::CompileBindings(nsTemplateRule* aRule, nsIContent* aBindings)
{
// Add an extended rule's bindings.
nsresult rv;
for (nsIContent* binding = aBindings->GetFirstChild();
binding;
binding = binding->GetNextSibling()) {
if (binding->NodeInfo()->Equals(nsGkAtoms::binding,
kNameSpaceID_XUL)) {
rv = CompileBinding(aRule, binding);
if (NS_FAILED(rv))
return rv;
}
}
aRule->AddBindingsToQueryProcessor(mQueryProcessor);
return NS_OK;
}
nsresult
nsXULTemplateBuilder::CompileBinding(nsTemplateRule* aRule,
nsIContent* aBinding)
{
// Compile a <binding> "condition", which must be of the form:
//
// <binding subject="?var1"
// predicate="resource"
// object="?var2" />
//
// XXXwaterson Some day it would be cool to allow the 'predicate'
// to be bound to a variable.
// subject
nsAutoString subject;
aBinding->GetAttr(kNameSpaceID_None, nsGkAtoms::subject, subject);
if (subject.IsEmpty()) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_BINDING_BAD_SUBJECT);
return NS_OK;
}
nsCOMPtr<nsIAtom> svar;
if (subject[0] == char16_t('?')) {
svar = do_GetAtom(subject);
}
else {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_BINDING_BAD_SUBJECT);
return NS_OK;
}
// predicate
nsAutoString predicate;
aBinding->GetAttr(kNameSpaceID_None, nsGkAtoms::predicate, predicate);
if (predicate.IsEmpty()) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_BINDING_BAD_PREDICATE);
return NS_OK;
}
// object
nsAutoString object;
aBinding->GetAttr(kNameSpaceID_None, nsGkAtoms::object, object);
if (object.IsEmpty()) {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_BINDING_BAD_OBJECT);
return NS_OK;
}
nsCOMPtr<nsIAtom> ovar;
if (object[0] == char16_t('?')) {
ovar = do_GetAtom(object);
}
else {
nsXULContentUtils::LogTemplateError(ERROR_TEMPLATE_BINDING_BAD_OBJECT);
return NS_OK;
}
return aRule->AddBinding(svar, predicate, ovar);
}
nsresult
nsXULTemplateBuilder::AddSimpleRuleBindings(nsTemplateRule* aRule,
nsIContent* aElement)
{
// Crawl the content tree of a "simple" rule, adding a variable
// assignment for any attribute whose value is "rdf:".
nsAutoTArray<nsIContent*, 8> elements;
if (elements.AppendElement(aElement) == nullptr)
return NS_ERROR_OUT_OF_MEMORY;
while (elements.Length()) {
// Pop the next element off the stack
uint32_t i = elements.Length() - 1;
nsIContent* element = elements[i];
elements.RemoveElementAt(i);
// Iterate through its attributes, looking for substitutions
// that we need to add as bindings.
uint32_t count = element->GetAttrCount();
for (i = 0; i < count; ++i) {
const nsAttrName* name = element->GetAttrNameAt(i);
if (!name->Equals(nsGkAtoms::id, kNameSpaceID_None) &&
!name->Equals(nsGkAtoms::uri, kNameSpaceID_None)) {
nsAutoString value;
element->GetAttr(name->NamespaceID(), name->LocalName(), value);
// Scan the attribute for variables, adding a binding for
// each one.
ParseAttribute(value, AddBindingsFor, nullptr, aRule);
}
}
// Push kids onto the stack, and search them next.
for (nsIContent* child = element->GetLastChild();
child;
child = child->GetPreviousSibling()) {
if (!elements.AppendElement(child))
return NS_ERROR_OUT_OF_MEMORY;
}
}
aRule->AddBindingsToQueryProcessor(mQueryProcessor);
return NS_OK;
}
void
nsXULTemplateBuilder::AddBindingsFor(nsXULTemplateBuilder* aThis,
const nsAString& aVariable,
void* aClosure)
{
// We should *only* be recieving "rdf:"-style variables. Make
// sure...
if (!StringBeginsWith(aVariable, NS_LITERAL_STRING("rdf:")))
return;
nsTemplateRule* rule = static_cast<nsTemplateRule*>(aClosure);
nsCOMPtr<nsIAtom> var = do_GetAtom(aVariable);
// Strip it down to the raw RDF property by clobbering the "rdf:"
// prefix
nsAutoString property;
property.Assign(Substring(aVariable, uint32_t(4), aVariable.Length() - 4));
if (! rule->HasBinding(rule->GetMemberVariable(), property, var))
// In the simple syntax, the binding is always from the
// member variable, through the property, to the target.
rule->AddBinding(rule->GetMemberVariable(), property, var);
}
nsresult
nsXULTemplateBuilder::IsSystemPrincipal(nsIPrincipal *principal, bool *result)
{
if (!gSystemPrincipal)
return NS_ERROR_UNEXPECTED;
*result = (principal == gSystemPrincipal);
return NS_OK;
}
bool
nsXULTemplateBuilder::IsActivated(nsIRDFResource *aResource)
{
for (ActivationEntry *entry = mTop;
entry != nullptr;
entry = entry->mPrevious) {
if (entry->mResource == aResource)
return true;
}
return false;
}
nsresult
nsXULTemplateBuilder::GetResultResource(nsIXULTemplateResult* aResult,
nsIRDFResource** aResource)
{
// get the resource for a result by checking its resource property. If it
// is not set, check the id. This allows non-chrome implementations to
// avoid having to use RDF.
nsresult rv = aResult->GetResource(aResource);
if (NS_FAILED(rv))
return rv;
if (! *aResource) {
nsAutoString id;
rv = aResult->GetId(id);
if (NS_FAILED(rv))
return rv;
return gRDFService->GetUnicodeResource(id, aResource);
}
return rv;
}
void
nsXULTemplateBuilder::OutputMatchToLog(nsIRDFResource* aId,
nsTemplateMatch* aMatch,
bool aIsNew)
{
int32_t priority = aMatch->QuerySetPriority() + 1;
int32_t activePriority = -1;
nsAutoString msg;
nsAutoString templateid;
mRoot->GetAttr(kNameSpaceID_None, nsGkAtoms::id, templateid);
msg.AppendLiteral("In template");
if (!templateid.IsEmpty()) {
msg.AppendLiteral(" with id ");
msg.Append(templateid);
}
nsAutoString refstring;
aMatch->mResult->GetBindingFor(mRefVariable, refstring);
if (!refstring.IsEmpty()) {
msg.AppendLiteral(" using ref ");
msg.Append(refstring);
}
msg.AppendLiteral("\n ");
nsTemplateMatch* match = nullptr;
if (mMatchMap.Get(aId, &match)){
while (match) {
if (match == aMatch)
break;
if (match->IsActive() &&
match->GetContainer() == aMatch->GetContainer()) {
activePriority = match->QuerySetPriority() + 1;
break;
}
match = match->mNext;
}
}
if (aMatch->IsActive()) {
if (aIsNew) {
msg.AppendLiteral("New active result for query ");
msg.AppendInt(priority);
msg.AppendLiteral(" matching rule ");
msg.AppendInt(aMatch->RuleIndex() + 1);
}
else {
msg.AppendLiteral("Removed active result for query ");
msg.AppendInt(priority);
if (activePriority > 0) {
msg.AppendLiteral(" (new active query is ");
msg.AppendInt(activePriority);
msg.Append(')');
}
else {
msg.AppendLiteral(" (no new active query)");
}
}
}
else {
if (aIsNew) {
msg.AppendLiteral("New inactive result for query ");
msg.AppendInt(priority);
if (activePriority > 0) {
msg.AppendLiteral(" (overridden by query ");
msg.AppendInt(activePriority);
msg.Append(')');
}
else {
msg.AppendLiteral(" (didn't match a rule)");
}
}
else {
msg.AppendLiteral("Removed inactive result for query ");
msg.AppendInt(priority);
if (activePriority > 0) {
msg.AppendLiteral(" (active query is ");
msg.AppendInt(activePriority);
msg.Append(')');
}
else {
msg.AppendLiteral(" (no active query)");
}
}
}
nsAutoString idstring;
nsXULContentUtils::GetTextForNode(aId, idstring);
msg.AppendLiteral(": ");
msg.Append(idstring);
nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (cs)
cs->LogStringMessage(msg.get());
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку