gecko-dev/layout/style/SheetLoadData.h

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/* -*- 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 mozilla_css_SheetLoadData_h
#define mozilla_css_SheetLoadData_h
#include "nsIUnicharStreamLoader.h"
#include "nsIThreadInternal.h"
namespace mozilla {
namespace css {
/*********************************************
* Data needed to properly load a stylesheet *
*********************************************/
static_assert(eAuthorSheetFeatures == 0 && eUserSheetFeatures == 1 &&
eAgentSheetFeatures == 2,
"sheet parsing mode constants won't fit "
"in SheetLoadData::mParsingMode");
class SheetLoadData final
: public nsIRunnable
, public nsIUnicharStreamLoaderObserver
, public nsIThreadObserver
{
protected:
virtual ~SheetLoadData(void);
public:
// Data for loading a sheet linked from a document
SheetLoadData(Loader* aLoader,
const nsAString& aTitle,
nsIURI* aURI,
StyleSheet* aSheet,
nsIStyleSheetLinkingElement* aOwningElement,
bool aIsAlternate,
nsICSSLoaderObserver* aObserver,
nsIPrincipal* aLoaderPrincipal,
nsINode* aRequestingNode);
// Data for loading a sheet linked from an @import rule
SheetLoadData(Loader* aLoader,
nsIURI* aURI,
StyleSheet* aSheet,
SheetLoadData* aParentData,
nsICSSLoaderObserver* aObserver,
nsIPrincipal* aLoaderPrincipal,
nsINode* aRequestingNode);
// Data for loading a non-document sheet
SheetLoadData(Loader* aLoader,
nsIURI* aURI,
StyleSheet* aSheet,
bool aSyncLoad,
bool aUseSystemPrincipal,
const Encoding* aPreloadEncoding,
nsICSSLoaderObserver* aObserver,
nsIPrincipal* aLoaderPrincipal,
nsINode* aRequestingNode);
already_AddRefed<nsIURI> GetReferrerURI();
void ScheduleLoadEventIfNeeded(nsresult aStatus);
NotNull<const Encoding*> DetermineNonBOMEncoding(nsACString const& aSegment,
nsIChannel* aChannel);
nsresult VerifySheetReadyToParse(nsresult aStatus,
const nsACString& aBytes,
nsIChannel* aChannel);
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
NS_DECL_NSITHREADOBSERVER
NS_DECL_NSIUNICHARSTREAMLOADEROBSERVER
// Hold a ref to the CSSLoader so we can call back to it to let it
// know the load finished
RefPtr<Loader> mLoader;
// Title needed to pull datas out of the pending datas table when
// the preferred title is changed
nsString mTitle;
// The encoding we decided to use for the sheet
const Encoding* mEncoding;
// URI we're loading. Null for inline sheets
nsCOMPtr<nsIURI> mURI;
// Should be 1 for non-inline sheets.
uint32_t mLineNumber;
// The sheet we're loading data for
RefPtr<StyleSheet> mSheet;
// Linked list of datas for the same URI as us
SheetLoadData* mNext; // strong ref
// Load data for the sheet that @import-ed us if we were @import-ed
// during the parse
RefPtr<SheetLoadData> mParentData;
// Number of sheets we @import-ed that are still loading
uint32_t mPendingChildren;
// mSyncLoad is true when the load needs to be synchronous -- right
// now only for LoadSheetSync and children of sync loads.
bool mSyncLoad : 1;
// mIsNonDocumentSheet is true if the load was triggered by LoadSheetSync or
// LoadSheet or an @import from such a sheet. Non-document sheet loads can
// proceed even if we have no document.
bool mIsNonDocumentSheet : 1;
// mIsLoading is true from the moment we are placed in the loader's
// "loading datas" table (right after the async channel is opened)
// to the moment we are removed from said table (due to the load
// completing or being cancelled).
bool mIsLoading : 1;
// mIsCancelled is set to true when a sheet load is stopped by
// Stop() or StopLoadingSheet() (which was removed in Bug 556446).
// SheetLoadData::OnStreamComplete() checks this to avoid parsing
// sheets that have been cancelled and such.
bool mIsCancelled : 1;
// mMustNotify is true if the load data is being loaded async and
// the original function call that started the load has returned.
// This applies only to observer notifications; load/error events
// are fired for any SheetLoadData that has a non-null
// mOwningElement.
bool mMustNotify : 1;
// mWasAlternate is true if the sheet was an alternate when the load data was
// created.
bool mWasAlternate : 1;
// mUseSystemPrincipal is true if the system principal should be used for
// this sheet, no matter what the channel principal is. Only true for sync
// loads.
bool mUseSystemPrincipal : 1;
// If true, this SheetLoadData is being used as a way to handle
// async observer notification for an already-complete sheet.
bool mSheetAlreadyComplete : 1;
// This is the element that imported the sheet. Needed to get the
// charset set on it and to fire load/error events.
nsCOMPtr<nsIStyleSheetLinkingElement> mOwningElement;
// The observer that wishes to be notified of load completion
nsCOMPtr<nsICSSLoaderObserver> mObserver;
// The principal that identifies who started loading us.
nsCOMPtr<nsIPrincipal> mLoaderPrincipal;
// The node that identifies who started loading us.
nsCOMPtr<nsINode> mRequestingNode;
// The encoding to use for preloading Must be empty if mOwningElement
// is non-null.
const Encoding* mPreloadEncoding;
// The status our load ended up with; this determines whether we
// should fire error events or load events. This gets initialized
// by ScheduleLoadEventIfNeeded, and is only used after that has
// been called.
MOZ_INIT_OUTSIDE_CTOR nsresult mStatus;
private:
void FireLoadEvent(nsIThreadInternal* aThread);
};
} // namespace css
} // namespace mozilla
#endif // mozilla_css_SheetLoadData_h