nsIScriptElement.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsIScriptElement_h___
#define nsIScriptElement_h___
#include "nsISupports.h"
#include "nsIURI.h"
#include "nsCOMPtr.h"
#include "nsIScriptLoaderObserver.h"
#include "nsWeakPtr.h"
#include "nsIParser.h"
#include "nsContentCreatorFunctions.h"
#include "nsIDOMHTMLScriptElement.h"
#include "mozilla/CORSMode.h"
#define NS_ISCRIPTELEMENT_IID \
{ 0xe60fca9b, 0x1b96, 0x4e4e, \
{ 0xa9, 0xb4, 0xdc, 0x98, 0x4f, 0x88, 0x3f, 0x9c } }
/**
* Internal interface implemented by script elements
*/
class nsIScriptElement : public nsIScriptLoaderObserver {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTELEMENT_IID)
explicit nsIScriptElement(mozilla::dom::FromParser aFromParser)
: mLineNumber(1),
mAlreadyStarted(false),
mMalformed(false),
mDoneAddingChildren(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
mForceAsync(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
mFrozen(false),
mDefer(false),
mAsync(false),
mExternal(false),
mParserCreated(aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT ?
mozilla::dom::NOT_FROM_PARSER : aFromParser),
// Fragment parser-created scripts (if executable)
// behave like script-created scripts.
mCreatorParser(nullptr)
{
}
/**
* Content type identifying the scripting language. Can be empty, in
* which case javascript will be assumed.
*/
virtual void GetScriptType(nsAString& type) = 0;
/**
* Location of script source text. Can return null, in which case
* this is assumed to be an inline script element.
*/
nsIURI* GetScriptURI()
{
NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
return mUri;
}
/**
* Script source text for inline script elements.
*/
virtual void GetScriptText(nsAString& text) = 0;
virtual void GetScriptCharset(nsAString& charset) = 0;
/**
* Freezes the return values of GetScriptDeferred(), GetScriptAsync() and
* GetScriptURI() so that subsequent modifications to the attributes don't
* change execution behavior.
*/
virtual void FreezeUriAsyncDefer() = 0;
/**
* Is the script deferred. Currently only supported by HTML scripts.
*/
bool GetScriptDeferred()
{
NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
return mDefer;
}
/**
* Is the script async. Currently only supported by HTML scripts.
*/
bool GetScriptAsync()
{
NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
return mAsync;
}
/**
* Is the script an external script?
*/
bool GetScriptExternal()
{
NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
return mExternal;
}
/**
* Returns how the element was created.
*/
mozilla::dom::FromParser GetParserCreated()
{
return mParserCreated;
}
void SetScriptLineNumber(uint32_t aLineNumber)
{
mLineNumber = aLineNumber;
}
uint32_t GetScriptLineNumber()
{
return mLineNumber;
}
void SetIsMalformed()
{
mMalformed = true;
}
bool IsMalformed()
{
return mMalformed;
}
void PreventExecution()
{
mAlreadyStarted = true;
}
void LoseParserInsertedness()
{
mFrozen = false;
mUri = nullptr;
mCreatorParser = nullptr;
mParserCreated = mozilla::dom::NOT_FROM_PARSER;
bool async = false;
nsCOMPtr<nsIDOMHTMLScriptElement> htmlScript = do_QueryInterface(this);
if (htmlScript) {
htmlScript->GetAsync(&async);
}
mForceAsync = !async;
}
void SetCreatorParser(nsIParser* aParser)
{
mCreatorParser = do_GetWeakReference(aParser);
}
/**
* Unblocks the creator parser
*/
void UnblockParser()
{
nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
if (parser) {
parser->UnblockParser();
}
}
/**
* Attempts to resume parsing asynchronously
*/
void ContinueParserAsync()
{
nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
if (parser) {
parser->ContinueInterruptedParsingAsync();
}
}
/**
* Informs the creator parser that the evaluation of this script is starting
*/
void BeginEvaluating()
{
nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
if (parser) {
parser->BeginEvaluatingParserInsertedScript();
}
}
/**
* Informs the creator parser that the evaluation of this script is ending
*/
void EndEvaluating()
{
nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
if (parser) {
parser->EndEvaluatingParserInsertedScript();
}
}
/**
* Retrieves a pointer to the creator parser if this has one or null if not
*/
already_AddRefed<nsIParser> GetCreatorParser()
{
nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
return parser.forget();
}
/**
* This method is called when the parser finishes creating the script
* element's children, if any are present.
*
* @return whether the parser will be blocked while this script is being
* loaded
*/
bool AttemptToExecute()
{
mDoneAddingChildren = true;
bool block = MaybeProcessScript();
if (!mAlreadyStarted) {
// Need to lose parser-insertedness here to allow another script to cause
// execution later.
LoseParserInsertedness();
}
return block;
}
/**
* Get the CORS mode of the script element
*/
virtual mozilla::CORSMode GetCORSMode() const
{
/* Default to no CORS */
return mozilla::CORS_NONE;
}
/**
* Fire an error event
*/
virtual nsresult FireErrorEvent() = 0;
protected:
/**
* Processes the script if it's in the document-tree and links to or
* contains a script. Once it has been evaluated there is no way to make it
* reevaluate the script, you'll have to create a new element. This also means
* that when adding a src attribute to an element that already contains an
* inline script, the script referenced by the src attribute will not be
* loaded.
*
* In order to be able to use multiple childNodes, or to use the
* fallback mechanism of using both inline script and linked script you have
* to add all attributes and childNodes before adding the element to the
* document-tree.
*
* @return whether the parser will be blocked while this script is being
* loaded
*/
virtual bool MaybeProcessScript() = 0;
/**
* The start line number of the script.
*/
uint32_t mLineNumber;
/**
* The "already started" flag per HTML5.
*/
bool mAlreadyStarted;
/**
* The script didn't have an end tag.
*/
bool mMalformed;
/**
* False if parser-inserted but the parser hasn't triggered running yet.
*/
bool mDoneAddingChildren;
/**
* If true, the .async property returns true instead of reflecting the
* content attribute.
*/
bool mForceAsync;
/**
* Whether src, defer and async are frozen.
*/
bool mFrozen;
/**
* The effective deferredness.
*/
bool mDefer;
/**
* The effective asyncness.
*/
bool mAsync;
/**
* The effective externalness. A script can be external with mUri being null
* if the src attribute contained an invalid URL string.
*/
bool mExternal;
/**
* Whether this element was parser-created.
*/
mozilla::dom::FromParser mParserCreated;
/**
* The effective src (or null if no src).
*/
nsCOMPtr<nsIURI> mUri;
/**
* The creator parser of a non-defer, non-async parser-inserted script.
*/
nsWeakPtr mCreatorParser;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptElement, NS_ISCRIPTELEMENT_IID)
#endif // nsIScriptElement_h___
