pjs/parser/html/nsHtml5SpeculativeLoad.h

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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) 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,
eSpeculativeLoadSetDocumentCharset
};
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);
mTypeOrCharsetSource.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 actual 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);
}
/**
* "Speculative" charset setting isn't truly speculative. If the charset
* is set via this operation, we are committed to it unless chardet or
* a late meta cause a reload. The reason why a parser
* thread-discovered charset gets communicated via the speculative load
* queue as opposed to tree operation queue is that the charset change
* must get processed before any actual speculative loads such as style
* sheets. Thus, encoding decisions by the parser thread have to maintain
* the queue order relative to true speculative loads. See bug 675499.
*/
inline void InitSetDocumentCharset(nsACString& aCharset,
PRInt32 aCharsetSource) {
NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
"Trying to reinitialize a speculative load!");
mOpCode = eSpeculativeLoadSetDocumentCharset;
CopyUTF8toUTF16(aCharset, mCharsetOrCrossOrigin);
mTypeOrCharsetSource.Assign((PRUnichar)aCharsetSource);
}
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. For eSpeculativeLoadSetDocumentCharset it is
* the charset that the document's charset is being set to. Otherwise
* it's empty.
*/
nsString mCharsetOrCrossOrigin;
/**
* If mOpCode is eSpeculativeLoadSetDocumentCharset, this is a
* one-character string whose single character's code point is to be
* interpreted as a charset source integer. Otherwise, it is empty or
* the value of the type attribute.
*/
nsString mTypeOrCharsetSource;
};
#endif // nsHtml5SpeculativeLoad_h_