зеркало из https://github.com/mozilla/pjs.git
642 строки
21 KiB
C++
642 строки
21 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla XForms support.
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*
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* The Initial Developer of the Original Code is
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* IBM Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brian Ryner <bryner@brianryner.com>
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* Olli Pettay <Olli.Pettay@helsinki.fi>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsXFormsInstanceElement.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMEventTarget.h"
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#include "nsIDOM3Node.h"
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#include "nsIDocument.h"
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#include "nsMemory.h"
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#include "nsXFormsAtoms.h"
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#include "nsString.h"
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#include "nsIDOMEventReceiver.h"
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#include "nsIDOMDOMImplementation.h"
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#include "nsIXTFGenericElementWrapper.h"
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#include "nsXFormsUtils.h"
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#include "nsNetUtil.h"
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static const char* kLoadAsData = "loadAsData";
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NS_IMPL_ISUPPORTS_INHERITED5(nsXFormsInstanceElement,
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nsXFormsStubElement,
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nsIInstanceElementPrivate,
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nsIStreamListener,
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nsIRequestObserver,
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nsIInterfaceRequestor,
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nsIChannelEventSink)
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nsXFormsInstanceElement::nsXFormsInstanceElement()
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: mElement(nsnull)
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, mInitialized(PR_FALSE)
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, mLazy(PR_FALSE)
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{
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::OnDestroyed()
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{
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if (mChannel) {
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// better be a good citizen and tell the browser that we don't need this
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// resource anymore.
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mChannel->Cancel(NS_BINDING_ABORTED);
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mChannel = nsnull;
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}
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mListener = nsnull;
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SetDocument(nsnull);
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mElement = nsnull;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::AttributeSet(nsIAtom *aName,
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const nsAString &aNewValue)
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{
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if (!mInitialized || mLazy)
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return NS_OK;
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if (aName == nsXFormsAtoms::src) {
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LoadExternalInstance(aNewValue);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::AttributeRemoved(nsIAtom *aName)
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{
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if (!mInitialized || mLazy)
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return NS_OK;
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if (aName == nsXFormsAtoms::src) {
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PRBool restart = PR_FALSE;
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if (mChannel) {
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// looks like we are trying to remove the src attribute while we are
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// already trying to load the external instance document. We'll stop
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// the current load effort.
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restart = PR_TRUE;
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mChannel->Cancel(NS_BINDING_ABORTED);
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mChannel = nsnull;
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mListener = nsnull;
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}
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// We no longer have an external instance to use. Reset our instance
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// document to whatever inline content we have.
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nsresult rv = CloneInlineInstance();
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// if we had already started to load an external instance document, then
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// as part of that we would have told the model to wait for that external
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// document to load before it finishes the model construction. Since we
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// aren't loading from an external document any longer, tell the model that
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// there is need to wait for us anymore.
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if (restart) {
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nsCOMPtr<nsIModelElementPrivate> model = GetModel();
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if (model) {
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model->InstanceLoadFinished(PR_TRUE);
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}
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}
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return rv;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::OnCreated(nsIXTFGenericElementWrapper *aWrapper)
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{
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aWrapper->SetNotificationMask(nsIXTFElement::NOTIFY_ATTRIBUTE_SET |
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nsIXTFElement::NOTIFY_ATTRIBUTE_REMOVED);
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nsCOMPtr<nsIDOMElement> node;
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aWrapper->GetElementNode(getter_AddRefs(node));
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// It's ok to keep a weak pointer to mElement. mElement will have an owning
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// reference to this object, so as long as we null out mElement in
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// OnDestroyed, it will always be valid.
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mElement = node;
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NS_ASSERTION(mElement, "Wrapper is not an nsIDOMElement, we'll crash soon");
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return NS_OK;
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}
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// nsIInterfaceRequestor
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NS_IMETHODIMP
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nsXFormsInstanceElement::GetInterface(const nsIID & aIID, void **aResult)
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{
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*aResult = nsnull;
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return QueryInterface(aIID, aResult);
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}
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// nsIChannelEventSink
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NS_IMETHODIMP
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nsXFormsInstanceElement::OnChannelRedirect(nsIChannel *OldChannel,
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nsIChannel *aNewChannel,
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PRUint32 aFlags)
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{
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NS_PRECONDITION(aNewChannel, "Redirect without a channel?");
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NS_PRECONDITION(!mLazy, "Loading an instance document for a lazy instance?");
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nsCOMPtr<nsIURI> newURI;
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nsresult rv = aNewChannel->GetURI(getter_AddRefs(newURI));
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NS_ENSURE_SUCCESS(rv, rv);
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NS_ENSURE_STATE(mElement);
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nsCOMPtr<nsIDOMDocument> domDoc;
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mElement->GetOwnerDocument(getter_AddRefs(domDoc));
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nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
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NS_ENSURE_STATE(doc);
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if (!nsXFormsUtils::CheckSameOrigin(doc->GetDocumentURI(), newURI)) {
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nsXFormsUtils::ReportError(NS_LITERAL_STRING("instanceLoadOrigin"), domDoc);
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return NS_ERROR_ABORT;
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}
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return NS_OK;
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}
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// nsIStreamListener
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// It is possible that mListener could be null here. If the document hit a
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// parsing error after we've already started to load the external source, then
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// Mozilla will destroy all of the elements and the document in order to load
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// the parser error page. This will cause mListener to become null but since
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// the channel will hold a nsCOMPtr to the nsXFormsInstanceElement preventing
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// it from being freed up, the channel will still be able to call the
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// nsIStreamListener functions that we implement here. And calling
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// mChannel->Cancel() is no guarantee that these other notifications won't come
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// through if the timing is wrong. So we need to check for mElement below
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// before we handle any of the stream notifications.
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NS_IMETHODIMP
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nsXFormsInstanceElement::OnStartRequest(nsIRequest *request, nsISupports *ctx)
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{
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NS_PRECONDITION(!mLazy, "Loading an instance document for a lazy instance?");
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if (!mElement || !mListener) {
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return NS_OK;
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}
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return mListener->OnStartRequest(request, ctx);
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::OnDataAvailable(nsIRequest *aRequest,
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nsISupports *ctxt,
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nsIInputStream *inStr,
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PRUint32 sourceOffset,
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PRUint32 count)
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{
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NS_PRECONDITION(!mLazy, "Loading an instance document for a lazy instance?");
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if (!mElement || !mListener) {
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return NS_OK;
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}
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return mListener->OnDataAvailable(aRequest, ctxt, inStr, sourceOffset, count);
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::OnStopRequest(nsIRequest *request, nsISupports *ctx,
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nsresult status)
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{
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NS_PRECONDITION(!mLazy, "Loading an instance document for a lazy instance?");
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if (status == NS_BINDING_ABORTED) {
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// looks like our element has already been destroyed. No use continuing on.
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return NS_OK;
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}
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mChannel = nsnull;
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NS_ASSERTION(mListener, "No stream listener for document!");
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mListener->OnStopRequest(request, ctx, status);
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PRBool succeeded = NS_SUCCEEDED(status);
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if (!succeeded) {
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SetDocument(nsnull);
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}
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if (mDocument) {
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nsCOMPtr<nsIDOMElement> docElem;
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mDocument->GetDocumentElement(getter_AddRefs(docElem));
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if (docElem) {
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nsAutoString tagName, namespaceURI;
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docElem->GetTagName(tagName);
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docElem->GetNamespaceURI(namespaceURI);
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if (tagName.EqualsLiteral("parsererror") &&
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namespaceURI.EqualsLiteral("http://www.mozilla.org/newlayout/xml/parsererror.xml")) {
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NS_WARNING("resulting instance document could not be parsed");
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succeeded = PR_FALSE;
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SetDocument(nsnull);
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}
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}
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}
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nsCOMPtr<nsIModelElementPrivate> model = GetModel();
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if (model) {
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model->InstanceLoadFinished(succeeded);
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}
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mListener = nsnull;
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return NS_OK;
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}
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// nsIInstanceElementPrivate
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NS_IMETHODIMP
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nsXFormsInstanceElement::GetDocument(nsIDOMDocument **aDocument)
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{
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NS_IF_ADDREF(*aDocument = mDocument);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::SetDocument(nsIDOMDocument *aDocument)
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{
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nsCOMPtr<nsIDocument> doc(do_QueryInterface(mDocument));
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if (doc) {
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doc->UnsetProperty(nsXFormsAtoms::instanceDocumentOwner);
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}
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mDocument = aDocument;
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doc = do_QueryInterface(mDocument);
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if (doc) {
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// Set property to prevent an instance document loading an external instance
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// document
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nsresult rv = doc->SetProperty(nsXFormsAtoms::isInstanceDocument, doc);
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsISupports> owner(do_QueryInterface(mElement));
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NS_ENSURE_STATE(owner);
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rv = doc->SetProperty(nsXFormsAtoms::instanceDocumentOwner, owner);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::BackupOriginalDocument()
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{
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nsresult rv = NS_OK;
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// This is called when xforms-ready is received by the model. By now we know
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// that the instance document, whether external or inline, is loaded into
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// mDocument. Get the root node, clone it, and insert it into our copy of
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// the document. This is the magic behind getting xforms-reset to work.
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nsCOMPtr<nsIDocument> origDoc(do_QueryInterface(mOriginalDocument));
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if(mDocument && origDoc) {
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// xf:instance elements in original document must not try to load anything.
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rv = origDoc->SetProperty(nsXFormsAtoms::isInstanceDocument, origDoc);
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIDOMNode> newNode;
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nsCOMPtr<nsIDOMElement> instanceRoot;
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rv = mDocument->GetDocumentElement(getter_AddRefs(instanceRoot));
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NS_ENSURE_SUCCESS(rv, rv);
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NS_ENSURE_TRUE(instanceRoot, NS_ERROR_FAILURE);
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nsCOMPtr<nsIDOMNode> nodeReturn;
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rv = instanceRoot->CloneNode(PR_TRUE, getter_AddRefs(newNode));
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if(NS_SUCCEEDED(rv)) {
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rv = mOriginalDocument->AppendChild(newNode, getter_AddRefs(nodeReturn));
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NS_WARN_IF_FALSE(NS_SUCCEEDED(rv),
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"failed to set up original instance document");
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::RestoreOriginalDocument()
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{
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nsresult rv = NS_OK;
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// This is called when xforms-reset is received by the model. We assume
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// that the backup of the instance document has been populated and is
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// loaded into mOriginalDocument. Get the backup's root node, clone it, and
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// insert it into the live copy of the instance document. This is the magic
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// behind getting xforms-reset to work.
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if(mDocument && mOriginalDocument) {
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nsCOMPtr<nsIDOMNode> newNode, instanceRootNode, nodeReturn;
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nsCOMPtr<nsIDOMElement> instanceRoot;
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// first remove all the old stuff
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rv = mDocument->GetDocumentElement(getter_AddRefs(instanceRoot));
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if(NS_SUCCEEDED(rv)) {
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if(instanceRoot) {
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rv = mDocument->RemoveChild(instanceRoot, getter_AddRefs(nodeReturn));
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NS_ENSURE_SUCCESS(rv, rv);
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}
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}
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// now all of the garbage is out o' there! Put the original data back
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// into mDocument
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rv = mOriginalDocument->GetDocumentElement(getter_AddRefs(instanceRoot));
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NS_ENSURE_SUCCESS(rv, rv);
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NS_ENSURE_TRUE(instanceRoot, NS_ERROR_FAILURE);
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instanceRootNode = do_QueryInterface(instanceRoot);
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rv = instanceRootNode->CloneNode(PR_TRUE, getter_AddRefs(newNode));
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if(NS_SUCCEEDED(rv)) {
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rv = mDocument->AppendChild(newNode, getter_AddRefs(nodeReturn));
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NS_WARN_IF_FALSE(NS_SUCCEEDED(rv),
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"failed to restore original instance document");
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::GetElement(nsIDOMElement **aElement)
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{
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NS_IF_ADDREF(*aElement = mElement);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsXFormsInstanceElement::Initialize()
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{
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if (mInitialized || !mElement) {
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return NS_OK;
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}
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mInitialized = PR_TRUE;
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nsCOMPtr<nsIModelElementPrivate> model = GetModel();
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NS_ENSURE_TRUE(model, NS_ERROR_FAILURE);
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model->AddInstanceElement(this);
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mElement->HasAttributeNS(NS_LITERAL_STRING(NS_NAMESPACE_MOZ_XFORMS_LAZY),
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NS_LITERAL_STRING("lazy"), &mLazy);
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// Lazy instance
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if (mLazy) {
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nsCOMPtr<nsIDOMDocument> domDoc;
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mElement->GetOwnerDocument(getter_AddRefs(domDoc));
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NS_ENSURE_STATE(domDoc);
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nsCOMPtr<nsIDOMDOMImplementation> domImpl;
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nsresult rv = domDoc->GetImplementation(getter_AddRefs(domImpl));
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIDOMDocument> newDoc;
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rv = domImpl->CreateDocument(EmptyString(), EmptyString(), nsnull,
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getter_AddRefs(newDoc));
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NS_ENSURE_SUCCESS(rv, rv);
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rv = SetDocument(newDoc);
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NS_ENSURE_SUCCESS(rv, rv);
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// Lazy authored instance documents have a root named "instanceData"
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nsCOMPtr<nsIDOMElement> instanceDataElement;
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nsCOMPtr<nsIDOMNode> childReturn;
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rv = mDocument->CreateElementNS(EmptyString(),
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NS_LITERAL_STRING("instanceData"),
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getter_AddRefs(instanceDataElement));
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NS_ENSURE_SUCCESS(rv, rv);
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rv = mDocument->AppendChild(instanceDataElement, getter_AddRefs(childReturn));
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NS_ENSURE_SUCCESS(rv, rv);
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// I don't know if not being able to create a backup document is worth
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// failing this function. Since it probably won't be used often, we'll
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// let it slide. But it probably does mean that things are going south
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// with the browser.
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domImpl->CreateDocument(EmptyString(), EmptyString(), nsnull,
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getter_AddRefs(mOriginalDocument));
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NS_WARN_IF_FALSE(mOriginalDocument, "Couldn't create mOriginalDocument!!");
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} else {
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// Normal instance
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// By the time this is called, we should be inserted in the document and
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// have all of our child elements, so this is our first opportunity to
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// create the instance document.
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nsAutoString src;
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mElement->GetAttribute(NS_LITERAL_STRING("src"), src);
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if (src.IsEmpty()) {
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// If we don't have a linked external instance, use our inline data.
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CloneInlineInstance();
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} else {
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LoadExternalInstance(src);
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}
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}
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return NS_OK;
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}
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// private methods
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nsresult
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nsXFormsInstanceElement::CloneInlineInstance()
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{
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// Clear out our existing instance data
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nsresult rv = CreateInstanceDocument();
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if (NS_FAILED(rv))
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return rv; // don't warn, we might just not be in the document yet
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// look for our first child element (skip over text nodes, etc.)
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nsCOMPtr<nsIDOMNode> child, temp;
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mElement->GetFirstChild(getter_AddRefs(child));
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while (child) {
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PRUint16 nodeType;
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child->GetNodeType(&nodeType);
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if (nodeType == nsIDOMNode::ELEMENT_NODE)
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break;
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temp.swap(child);
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temp->GetNextSibling(getter_AddRefs(child));
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}
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if (child) {
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nsCOMPtr<nsIDOMNode> newNode;
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rv = mDocument->ImportNode(child, PR_TRUE, getter_AddRefs(newNode));
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIDOMNode> nodeReturn;
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rv = mDocument->AppendChild(newNode, getter_AddRefs(nodeReturn));
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NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "failed to append root instance node");
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}
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return rv;
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}
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void
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nsXFormsInstanceElement::LoadExternalInstance(const nsAString &aSrc)
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{
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nsresult rv = NS_ERROR_FAILURE;
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|
|
PRBool restart = PR_FALSE;
|
|
if (mChannel) {
|
|
// probably hit this condition because someone changed the value of our
|
|
// src attribute while we are already trying to load the previously
|
|
// specified document. We'll stop the current load effort and kick off the
|
|
// new attempt.
|
|
restart = PR_TRUE;
|
|
mChannel->Cancel(NS_BINDING_ABORTED);
|
|
mChannel = nsnull;
|
|
mListener = nsnull;
|
|
}
|
|
|
|
// Check whether we are an instance document ourselves
|
|
nsCOMPtr<nsIDOMDocument> domDoc;
|
|
mElement->GetOwnerDocument(getter_AddRefs(domDoc));
|
|
nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
|
|
if (doc) {
|
|
if (doc->GetProperty(nsXFormsAtoms::isInstanceDocument)) {
|
|
/// Property exists, which means we are an instance document trying
|
|
/// to load an external instance document. We do not allow that.
|
|
const nsPromiseFlatString& flat = PromiseFlatString(aSrc);
|
|
const PRUnichar *strings[] = { flat.get() };
|
|
nsXFormsUtils::ReportError(NS_LITERAL_STRING("instanceInstanceLoad"),
|
|
strings, 1, mElement, mElement);
|
|
} else {
|
|
// Clear out our existing instance data
|
|
if (NS_SUCCEEDED(CreateInstanceDocument())) {
|
|
nsCOMPtr<nsIDocument> newDoc = do_QueryInterface(mDocument);
|
|
|
|
nsCOMPtr<nsIURI> uri;
|
|
NS_NewURI(getter_AddRefs(uri), aSrc,
|
|
doc->GetDocumentCharacterSet().get(), doc->GetDocumentURI());
|
|
if (uri) {
|
|
if (nsXFormsUtils::CheckSameOrigin(doc->GetDocumentURI(), uri)) {
|
|
nsCOMPtr<nsILoadGroup> loadGroup;
|
|
loadGroup = doc->GetDocumentLoadGroup();
|
|
NS_WARN_IF_FALSE(loadGroup, "No load group!");
|
|
|
|
// Using the same load group as the main document and creating
|
|
// the channel with LOAD_NORMAL flag delays the dispatching of
|
|
// the 'load' event until all instance data documents have been
|
|
// loaded.
|
|
NS_NewChannel(getter_AddRefs(mChannel), uri, nsnull, loadGroup,
|
|
nsnull, nsIRequest::LOAD_NORMAL);
|
|
|
|
if (mChannel) {
|
|
rv = newDoc->StartDocumentLoad(kLoadAsData, mChannel, loadGroup,
|
|
nsnull, getter_AddRefs(mListener),
|
|
PR_TRUE);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
mChannel->SetNotificationCallbacks(this);
|
|
rv = mChannel->AsyncOpen(this, nsnull);
|
|
}
|
|
}
|
|
} else {
|
|
nsXFormsUtils::ReportError(NS_LITERAL_STRING("instanceLoadOrigin"),
|
|
domDoc);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
nsCOMPtr<nsIModelElementPrivate> model = GetModel();
|
|
if (model) {
|
|
// if this isn't the first time that this instance element has tried
|
|
// to load an external document, then we don't need to tell the model
|
|
// to wait again. It would screw up the counter it uses. But if this
|
|
// isn't a restart, then by golly, the model better wait for us!
|
|
if (!restart) {
|
|
model->InstanceLoadStarted();
|
|
}
|
|
if (NS_FAILED(rv)) {
|
|
model->InstanceLoadFinished(PR_FALSE);
|
|
}
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
nsXFormsInstanceElement::CreateInstanceDocument()
|
|
{
|
|
nsCOMPtr<nsIDOMDocument> doc;
|
|
nsresult rv = mElement->GetOwnerDocument(getter_AddRefs(doc));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (!doc) // could be we just aren't inserted yet, so don't warn
|
|
return NS_ERROR_FAILURE;
|
|
|
|
nsCOMPtr<nsIDOMDOMImplementation> domImpl;
|
|
rv = doc->GetImplementation(getter_AddRefs(domImpl));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
nsCOMPtr<nsIDOMDocument> newDoc;
|
|
rv = domImpl->CreateDocument(EmptyString(), EmptyString(), nsnull,
|
|
getter_AddRefs(newDoc));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
rv = SetDocument(newDoc);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
// I don't know if not being able to create a backup document is worth
|
|
// failing this function. Since it probably won't be used often, we'll
|
|
// let it slide. But it probably does mean that things are going south
|
|
// with the browser.
|
|
domImpl->CreateDocument(EmptyString(), EmptyString(), nsnull,
|
|
getter_AddRefs(mOriginalDocument));
|
|
return rv;
|
|
}
|
|
|
|
already_AddRefed<nsIModelElementPrivate>
|
|
nsXFormsInstanceElement::GetModel()
|
|
{
|
|
if (!mElement)
|
|
{
|
|
NS_WARNING("The XTF wrapper element has been destroyed");
|
|
return nsnull;
|
|
}
|
|
|
|
nsCOMPtr<nsIDOMNode> parentNode;
|
|
mElement->GetParentNode(getter_AddRefs(parentNode));
|
|
|
|
nsIModelElementPrivate *model = nsnull;
|
|
if (parentNode)
|
|
CallQueryInterface(parentNode, &model);
|
|
return model;
|
|
}
|
|
|
|
nsresult
|
|
NS_NewXFormsInstanceElement(nsIXTFElement **aResult)
|
|
{
|
|
*aResult = new nsXFormsInstanceElement();
|
|
if (!*aResult)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(*aResult);
|
|
return NS_OK;
|
|
}
|