зеркало из https://github.com/mozilla/gecko-dev.git
356 строки
9.4 KiB
C++
356 строки
9.4 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.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vidur Apparao <vidur@netscape.com> (original author)
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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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#ifndef nsIScriptElement_h___
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#define nsIScriptElement_h___
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#include "nsISupports.h"
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#include "nsIURI.h"
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#include "nsCOMPtr.h"
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#include "nsIScriptLoaderObserver.h"
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#include "nsWeakPtr.h"
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#include "nsIParser.h"
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#include "nsContentCreatorFunctions.h"
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#include "nsIDOMHTMLScriptElement.h"
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#include "mozilla/CORSMode.h"
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#define NS_ISCRIPTELEMENT_IID \
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{ 0x24ab3ff2, 0xd75e, 0x4be4, \
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{ 0x8d, 0x50, 0xd6, 0x75, 0x31, 0x29, 0xab, 0x65 } }
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/**
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* Internal interface implemented by script elements
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*/
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class nsIScriptElement : public nsIScriptLoaderObserver {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTELEMENT_IID)
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nsIScriptElement(mozilla::dom::FromParser aFromParser)
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: mLineNumber(0),
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mAlreadyStarted(false),
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mMalformed(false),
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mDoneAddingChildren(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
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aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
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mForceAsync(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
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aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
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mFrozen(false),
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mDefer(false),
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mAsync(false),
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mExternal(false),
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mParserCreated(aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT ?
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mozilla::dom::NOT_FROM_PARSER : aFromParser),
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// Fragment parser-created scripts (if executable)
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// behave like script-created scripts.
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mCreatorParser(nsnull)
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{
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}
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/**
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* Content type identifying the scripting language. Can be empty, in
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* which case javascript will be assumed.
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*/
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virtual void GetScriptType(nsAString& type) = 0;
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/**
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* Location of script source text. Can return null, in which case
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* this is assumed to be an inline script element.
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*/
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nsIURI* GetScriptURI()
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{
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NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
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return mUri;
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}
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/**
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* Script source text for inline script elements.
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*/
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virtual void GetScriptText(nsAString& text) = 0;
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virtual void GetScriptCharset(nsAString& charset) = 0;
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/**
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* Freezes the return values of GetScriptDeferred(), GetScriptAsync() and
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* GetScriptURI() so that subsequent modifications to the attributes don't
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* change execution behavior.
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*/
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virtual void FreezeUriAsyncDefer() = 0;
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/**
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* Is the script deferred. Currently only supported by HTML scripts.
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*/
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bool GetScriptDeferred()
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{
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NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
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return mDefer;
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}
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/**
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* Is the script async. Currently only supported by HTML scripts.
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*/
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bool GetScriptAsync()
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{
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NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
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return mAsync;
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}
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/**
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* Is the script an external script?
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*/
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bool GetScriptExternal()
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{
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NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
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return mExternal;
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}
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/**
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* Returns how the element was created.
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*/
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mozilla::dom::FromParser GetParserCreated()
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{
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return mParserCreated;
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}
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void SetScriptLineNumber(PRUint32 aLineNumber)
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{
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mLineNumber = aLineNumber;
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}
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PRUint32 GetScriptLineNumber()
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{
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return mLineNumber;
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}
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void SetIsMalformed()
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{
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mMalformed = true;
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}
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bool IsMalformed()
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{
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return mMalformed;
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}
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void PreventExecution()
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{
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mAlreadyStarted = true;
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}
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void LoseParserInsertedness()
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{
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mFrozen = false;
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mUri = nsnull;
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mCreatorParser = nsnull;
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mParserCreated = mozilla::dom::NOT_FROM_PARSER;
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bool async = false;
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nsCOMPtr<nsIDOMHTMLScriptElement> htmlScript = do_QueryInterface(this);
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if (htmlScript) {
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htmlScript->GetAsync(&async);
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}
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mForceAsync = !async;
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}
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void SetCreatorParser(nsIParser* aParser)
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{
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mCreatorParser = getter_AddRefs(NS_GetWeakReference(aParser));
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}
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/**
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* Unblocks the creator parser
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*/
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void UnblockParser()
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{
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nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
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if (parser) {
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parser->UnblockParser();
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}
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}
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/**
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* Attempts to resume parsing asynchronously
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*/
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void ContinueParserAsync()
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{
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nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
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if (parser) {
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parser->ContinueInterruptedParsingAsync();
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}
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}
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/**
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* Informs the creator parser that the evaluation of this script is starting
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*/
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void BeginEvaluating()
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{
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nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
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if (parser) {
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parser->BeginEvaluatingParserInsertedScript();
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}
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}
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/**
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* Informs the creator parser that the evaluation of this script is ending
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*/
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void EndEvaluating()
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{
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nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
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if (parser) {
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parser->EndEvaluatingParserInsertedScript();
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}
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}
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/**
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* Retrieves a pointer to the creator parser if this has one or null if not
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*/
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already_AddRefed<nsIParser> GetCreatorParser()
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{
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nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
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return parser.forget();
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}
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/**
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* This method is called when the parser finishes creating the script
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* element's children, if any are present.
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*
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* @return whether the parser will be blocked while this script is being
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* loaded
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*/
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bool AttemptToExecute()
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{
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mDoneAddingChildren = true;
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bool block = MaybeProcessScript();
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if (!mAlreadyStarted) {
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// Need to lose parser-insertedness here to allow another script to cause
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// execution later.
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LoseParserInsertedness();
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}
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return block;
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}
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/**
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* Get the CORS mode of the script element
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*/
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virtual mozilla::CORSMode GetCORSMode() const
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{
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/* Default to no CORS */
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return mozilla::CORS_NONE;
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}
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protected:
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/**
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* Processes the script if it's in the document-tree and links to or
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* contains a script. Once it has been evaluated there is no way to make it
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* reevaluate the script, you'll have to create a new element. This also means
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* that when adding a src attribute to an element that already contains an
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* inline script, the script referenced by the src attribute will not be
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* loaded.
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*
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* In order to be able to use multiple childNodes, or to use the
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* fallback mechanism of using both inline script and linked script you have
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* to add all attributes and childNodes before adding the element to the
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* document-tree.
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*
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* @return whether the parser will be blocked while this script is being
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* loaded
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*/
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virtual bool MaybeProcessScript() = 0;
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/**
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* The start line number of the script.
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*/
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PRUint32 mLineNumber;
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/**
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* The "already started" flag per HTML5.
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*/
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bool mAlreadyStarted;
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/**
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* The script didn't have an end tag.
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*/
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bool mMalformed;
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/**
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* False if parser-inserted but the parser hasn't triggered running yet.
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*/
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bool mDoneAddingChildren;
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/**
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* If true, the .async property returns true instead of reflecting the
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* content attribute.
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*/
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bool mForceAsync;
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/**
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* Whether src, defer and async are frozen.
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*/
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bool mFrozen;
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/**
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* The effective deferredness.
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*/
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bool mDefer;
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/**
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* The effective asyncness.
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*/
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bool mAsync;
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/**
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* The effective externalness. A script can be external with mUri being null
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* if the src attribute contained an invalid URL string.
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*/
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bool mExternal;
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/**
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* Whether this element was parser-created.
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*/
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mozilla::dom::FromParser mParserCreated;
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/**
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* The effective src (or null if no src).
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*/
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nsCOMPtr<nsIURI> mUri;
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/**
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* The creator parser of a non-defer, non-async parser-inserted script.
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*/
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nsWeakPtr mCreatorParser;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptElement, NS_ISCRIPTELEMENT_IID)
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#endif // nsIScriptElement_h___
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