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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is HTML Parser C++ Translator code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2008-2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Henri Sivonen <hsivonen@iki.fi>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

  private:

#ifdef DEBUG_hsivonen
    static PRUint32    sInsertionBatchMaxLength;
    static PRUint32    sAppendBatchMaxSize;
    static PRUint32    sAppendBatchSlotsExamined;
    static PRUint32    sAppendBatchExaminations;
#endif
    static PRUint32    sTreeOpQueueMaxLength;
    PRBool             mNeedsFlush;
    nsCOMPtr<nsITimer> mFlushTimer;
    PRBool             mHasProcessedBase;
#ifdef DEBUG
    PRBool             mActive;
#endif
    nsTArray<nsHtml5TreeOperation>       mOpQueue;
    nsTArray<nsIContentPtr>              mElementsSeenInThisAppendBatch;
    nsTArray<nsHtml5PendingNotification> mPendingNotifications;

    inline void    MaybeSuspend() {
      if (!mNeedsFlush) {
        mNeedsFlush = !!(mOpQueue.Length() >= sTreeOpQueueMaxLength);
      }
      if (parser->DidProcessATokenImpl() == NS_ERROR_HTMLPARSER_INTERRUPTED || mNeedsFlush) {
        // We've been in the parser for too long and/or the op queue is becoming too
        // long to flush in one go it it grows further.
        parser->Suspend();
        requestSuspension();
      }
    }

  public:

    nsHtml5TreeBuilder(nsHtml5Parser* aParser);

    ~nsHtml5TreeBuilder();

    void Flush();

    inline void MaybeFlush() {
      if (mNeedsFlush) {
        Flush();
      }
    }

    inline void DeferredTimerFlush() {
      if (!mOpQueue.IsEmpty()) {
        mNeedsFlush = PR_TRUE;
      }
    }

    inline void PostPendingAppendNotification(nsIContent* aParent, nsIContent* aChild) {
      PRBool newParent = PR_TRUE;
      const nsIContentPtr* first = mElementsSeenInThisAppendBatch.Elements();
      const nsIContentPtr* last = first + mElementsSeenInThisAppendBatch.Length() - 1;
      for (const nsIContentPtr* iter = last; iter >= first; --iter) {
#ifdef DEBUG_hsivonen
        sAppendBatchSlotsExamined++;
#endif
        if (*iter == aParent) {
          newParent = PR_FALSE;
          break;
        }
      }
      if (aChild->IsNodeOfType(nsINode::eELEMENT)) {
        mElementsSeenInThisAppendBatch.AppendElement(aChild);
      }
      mElementsSeenInThisAppendBatch.AppendElement(aParent);
      if (newParent) {
        mPendingNotifications.AppendElement(aParent);
      }
#ifdef DEBUG_hsivonen
      sAppendBatchExaminations++;
#endif
    }

    inline void FlushPendingAppendNotifications() {
      const nsHtml5PendingNotification* start = mPendingNotifications.Elements();
      const nsHtml5PendingNotification* end = start + mPendingNotifications.Length();
      for (nsHtml5PendingNotification* iter = (nsHtml5PendingNotification*)start; iter < end; ++iter) {
        iter->Fire();
      }
      mPendingNotifications.Clear();
#ifdef DEBUG_hsivonen
      if (mElementsSeenInThisAppendBatch.Length() > sAppendBatchMaxSize) {
        sAppendBatchMaxSize = mElementsSeenInThisAppendBatch.Length();
      }
#endif
      mElementsSeenInThisAppendBatch.Clear();
    }

    inline nsIDocument* GetDocument() {
      return parser->GetDocument();
    }

    inline void SetScriptElement(nsIContent* aScript) {
      parser->SetScriptElement(aScript);
    }

    inline void UpdateStyleSheet(nsIContent* aSheet) {
      parser->UpdateStyleSheet(aSheet);
    }

    inline nsresult ProcessBase(nsIContent* aBase) {
      if (!mHasProcessedBase) {
        nsresult rv = parser->ProcessBASETag(aBase);
        NS_ENSURE_SUCCESS(rv, rv);
        mHasProcessedBase = PR_TRUE;
      }
      return NS_OK;
    }

    inline nsresult ProcessMeta(nsIContent* aMeta) {
      return parser->ProcessMETATag(aMeta);
    }

    inline nsresult ProcessOfflineManifest(nsIContent* aHtml) {
      parser->ProcessOfflineManifest(aHtml);
      return NS_OK;
    }

    inline void StartLayout() {
      nsIDocument* doc = GetDocument();
      if (doc) {
        FlushPendingAppendNotifications();
        parser->StartLayout(PR_FALSE);
      }
    }

    void DoUnlink();

    void DoTraverse(nsCycleCollectionTraversalCallback &cb);