The Tor Browser: content/base/src/nsReferencedElement.cpp@deefc01c0e14 (annotated)

content/base/src/nsReferencedElement.cpp@deefc01c0e14 (annotated)

content/base/src/nsReferencedElement.cpp

Thu, 15 Jan 2015 21:03:48 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 21:03:48 +0100
branch: TOR_BUG_9701
changeset 11: deefc01c0e14
permissions: -rw-r--r--

Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=2 sw=2 et tw=78: */
 /* 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 "nsReferencedElement.h"
 #include "nsContentUtils.h"
 #include "nsIURI.h"
 #include "nsBindingManager.h"
 #include "nsEscape.h"
 #include "nsXBLPrototypeBinding.h"
 #include "nsIDOMNode.h"
 #include "nsIDOMElement.h"
 #include "nsCycleCollectionParticipant.h"
 void
 nsReferencedElement::Reset(nsIContent* aFromContent, nsIURI* aURI,
                            bool aWatch, bool aReferenceImage)
 {
   NS_ABORT_IF_FALSE(aFromContent, "Reset() expects non-null content pointer");
   Unlink();
   if (!aURI)
     return;
   nsAutoCString refPart;
   aURI->GetRef(refPart);
   // Unescape %-escapes in the reference. The result will be in the
   // origin charset of the URL, hopefully...
   NS_UnescapeURL(refPart);
   nsAutoCString charset;
   aURI->GetOriginCharset(charset);
   nsAutoString ref;
   nsresult rv = nsContentUtils::ConvertStringFromEncoding(charset,
                                                           refPart,
                                                           ref);
   if (NS_FAILED(rv)) {
     // XXX Eww. If fallible malloc failed, using a conversion method that
     // assumes UTF-8 and doesn't handle UTF-8 errors.
     // https://bugzilla.mozilla.org/show_bug.cgi?id=951082
     CopyUTF8toUTF16(refPart, ref);
   }
   if (ref.IsEmpty())
     return;
   // Get the current document
   nsIDocument *doc = aFromContent->GetCurrentDoc();
   if (!doc)
     return;
   nsIContent* bindingParent = aFromContent->GetBindingParent();
   if (bindingParent) {
     nsXBLBinding* binding = bindingParent->GetXBLBinding();
     if (binding) {
       bool isEqualExceptRef;
       rv = aURI->EqualsExceptRef(binding->PrototypeBinding()->DocURI(),
                                  &isEqualExceptRef);
       if (NS_SUCCEEDED(rv) && isEqualExceptRef) {
         // XXX sXBL/XBL2 issue
         // Our content is an anonymous XBL element from a binding inside the
         // same document that the referenced URI points to. In order to avoid
         // the risk of ID collisions we restrict ourselves to anonymous
         // elements from this binding; specifically, URIs that are relative to
         // the binding document should resolve to the copy of the target
         // element that has been inserted into the bound document.
         // If the URI points to a different document we don't need this
         // restriction.
         nsINodeList* anonymousChildren =
           doc->BindingManager()->GetAnonymousNodesFor(bindingParent);
         if (anonymousChildren) {
           uint32_t length;
           anonymousChildren->GetLength(&length);
           for (uint32_t i = 0; i < length && !mElement; ++i) {
             mElement =
               nsContentUtils::MatchElementId(anonymousChildren->Item(i), ref);
           }
         }
         // We don't have watching working yet for XBL, so bail out here.
         return;
       }
     }
   }
   bool isEqualExceptRef;
   rv = aURI->EqualsExceptRef(doc->GetDocumentURI(), &isEqualExceptRef);
   if (NS_FAILED(rv) || !isEqualExceptRef) {
     nsRefPtr<nsIDocument::ExternalResourceLoad> load;
     doc = doc->RequestExternalResource(aURI, aFromContent,
                                        getter_AddRefs(load));
     if (!doc) {
       if (!load || !aWatch) {
         // Nothing will ever happen here
         return;
       }
       DocumentLoadNotification* observer =
         new DocumentLoadNotification(this, ref);
       mPendingNotification = observer;
       if (observer) {
         load->AddObserver(observer);
       }
       // Keep going so we set up our watching stuff a bit
     }
   }
   if (aWatch) {
     nsCOMPtr<nsIAtom> atom = do_GetAtom(ref);
     if (!atom)
       return;
     atom.swap(mWatchID);
   }
   mReferencingImage = aReferenceImage;
   HaveNewDocument(doc, aWatch, ref);
 }
 void
 nsReferencedElement::ResetWithID(nsIContent* aFromContent, const nsString& aID,
                                  bool aWatch)
 {
   nsIDocument *doc = aFromContent->GetCurrentDoc();
   if (!doc)
     return;
   // XXX Need to take care of XBL/XBL2
   if (aWatch) {
     nsCOMPtr<nsIAtom> atom = do_GetAtom(aID);
     if (!atom)
       return;
     atom.swap(mWatchID);
   }
   mReferencingImage = false;
   HaveNewDocument(doc, aWatch, aID);
 }
 void
 nsReferencedElement::HaveNewDocument(nsIDocument* aDocument, bool aWatch,
                                      const nsString& aRef)
 {
   if (aWatch) {
     mWatchDocument = aDocument;
     if (mWatchDocument) {
       mElement = mWatchDocument->AddIDTargetObserver(mWatchID, Observe, this,
                                                      mReferencingImage);
     }
     return;
   }
   if (!aDocument) {
     return;
   }
   Element *e = mReferencingImage ? aDocument->LookupImageElement(aRef) :
                                    aDocument->GetElementById(aRef);
   if (e) {
     mElement = e;
   }
 }
 void
 nsReferencedElement::Traverse(nsCycleCollectionTraversalCallback* aCB)
 {
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*aCB, "mWatchDocument");
   aCB->NoteXPCOMChild(mWatchDocument);
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*aCB, "mContent");
   aCB->NoteXPCOMChild(mElement);
 }
 void
 nsReferencedElement::Unlink()
 {
   if (mWatchDocument && mWatchID) {
     mWatchDocument->RemoveIDTargetObserver(mWatchID, Observe, this,
                                            mReferencingImage);
   }
   if (mPendingNotification) {
     mPendingNotification->Clear();
     mPendingNotification = nullptr;
   }
   mWatchDocument = nullptr;
   mWatchID = nullptr;
   mElement = nullptr;
   mReferencingImage = false;
 }
 bool
 nsReferencedElement::Observe(Element* aOldElement,
                              Element* aNewElement, void* aData)
 {
   nsReferencedElement* p = static_cast<nsReferencedElement*>(aData);
   if (p->mPendingNotification) {
     p->mPendingNotification->SetTo(aNewElement);
   } else {
     NS_ASSERTION(aOldElement == p->mElement, "Failed to track content!");
     ChangeNotification* watcher =
       new ChangeNotification(p, aOldElement, aNewElement);
     p->mPendingNotification = watcher;
     nsContentUtils::AddScriptRunner(watcher);
   }
   bool keepTracking = p->IsPersistent();
   if (!keepTracking) {
     p->mWatchDocument = nullptr;
     p->mWatchID = nullptr;
   }
   return keepTracking;
 }
 NS_IMPL_ISUPPORTS_INHERITED0(nsReferencedElement::ChangeNotification,
                              nsRunnable)
 NS_IMPL_ISUPPORTS(nsReferencedElement::DocumentLoadNotification,
                   nsIObserver)
 NS_IMETHODIMP
 nsReferencedElement::DocumentLoadNotification::Observe(nsISupports* aSubject,
                                                        const char* aTopic,
                                                        const char16_t* aData)
 {
   NS_ASSERTION(PL_strcmp(aTopic, "external-resource-document-created") == 0,
                "Unexpected topic");
   if (mTarget) {
     nsCOMPtr<nsIDocument> doc = do_QueryInterface(aSubject);
     mTarget->mPendingNotification = nullptr;
     NS_ASSERTION(!mTarget->mElement, "Why do we have content here?");
     // If we got here, that means we had Reset() called with aWatch ==
     // true.  So keep watching if IsPersistent().
     mTarget->HaveNewDocument(doc, mTarget->IsPersistent(), mRef);
     mTarget->ElementChanged(nullptr, mTarget->mElement);
   }
   return NS_OK;
 }

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content/base/src/nsReferencedElement.cpp@deefc01c0e14 (annotated)

content/base/src/nsReferencedElement.cpp