parser/html/nsHtml5SpeculativeLoad.h
author Boris Zbarsky <bzbarsky@mit.edu>
Fri, 29 Jul 2011 14:30:00 -0400
changeset 73576 185e9d01a1ec3fcc33e9907629db418814a957e7
parent 73574 32e4025287391650ca1c252e43edf444c6684cd7
child 73711 8e4e181a9ce9650d3937d11c76e6bafbde651379
permissions -rw-r--r--
Bug 672014. Pass the crossorigin attribute through to image preloading code. r=joe,hsivonen

/* ***** 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) 2010
 * 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 ***** */
 
#ifndef nsHtml5SpeculativeLoad_h_
#define nsHtml5SpeculativeLoad_h_

#include "nsString.h"

class nsHtml5TreeOpExecutor;

enum eHtml5SpeculativeLoad {
#ifdef DEBUG
  eSpeculativeLoadUninitialized,
#endif
  eSpeculativeLoadBase,
  eSpeculativeLoadImage,
  eSpeculativeLoadScript,
  eSpeculativeLoadStyle,
  eSpeculativeLoadManifest  
};

class nsHtml5SpeculativeLoad {
  public:
    nsHtml5SpeculativeLoad();
    ~nsHtml5SpeculativeLoad();
    
    inline void InitBase(const nsAString& aUrl) {
      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
                      "Trying to reinitialize a speculative load!");
      mOpCode = eSpeculativeLoadBase;
      mUrl.Assign(aUrl);
    }

    inline void InitImage(const nsAString& aUrl,
                          const nsAString& aCrossOrigin) {
      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
                      "Trying to reinitialize a speculative load!");
      mOpCode = eSpeculativeLoadImage;
      mUrl.Assign(aUrl);
      mCharsetOrCrossOrigin.Assign(aCrossOrigin);
    }

    inline void InitScript(const nsAString& aUrl,
                      const nsAString& aCharset,
                      const nsAString& aType) {
      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
                      "Trying to reinitialize a speculative load!");
      mOpCode = eSpeculativeLoadScript;
      mUrl.Assign(aUrl);
      mCharsetOrCrossOrigin.Assign(aCharset);
      mType.Assign(aType);
    }
    
    inline void InitStyle(const nsAString& aUrl, const nsAString& aCharset) {
      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
                      "Trying to reinitialize a speculative load!");
      mOpCode = eSpeculativeLoadStyle;
      mUrl.Assign(aUrl);
      mCharsetOrCrossOrigin.Assign(aCharset);
    }

    /**
     * "Speculative" manifest loads aren't truly speculative--if a manifest
     * gets loaded, we are committed to it. There can never be a <script>
     * before the manifest, so the situation of having to undo a manifest due
     * to document.write() never arises. The reason why a parser
     * thread-discovered manifest gets loaded via the speculative load queue
     * as opposed to tree operation queue is that the manifest must get
     * processed before any actually speculative loads such as scripts. Thus,
     * manifests seen by the parser thread have to maintain the queue order
     * relative to true speculative loads. See bug 541079.
     */
    inline void InitManifest(const nsAString& aUrl) {
      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
                      "Trying to reinitialize a speculative load!");
      mOpCode = eSpeculativeLoadManifest;
      mUrl.Assign(aUrl);
    }

    void Perform(nsHtml5TreeOpExecutor* aExecutor);
    
  private:
    eHtml5SpeculativeLoad mOpCode;
    nsString mUrl;
    // If mOpCode is eSpeculativeLoadImage, this is the value of the
    // "crossorigin" attribute.  If mOpCode is eSpeculativeLoadStyle
    // or eSpeculativeLoadScript then this is the value of the
    // "charset" attribute.  Otherwise it's empty.
    nsString mCharsetOrCrossOrigin;
    nsString mType;
};

#endif // nsHtml5SpeculativeLoad_h_