gecko-dev/layout/style/CSSStyleSheet.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
/* 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/. */
/* representation of a CSS style sheet */
#ifndef mozilla_CSSStyleSheet_h
#define mozilla_CSSStyleSheet_h
#include "mozilla/Attributes.h"
#include "mozilla/IncrementalClearCOMRuleArray.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInfo.h"
#include "mozilla/css/SheetParsingMode.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/CSSStyleSheetBinding.h"
#include "nscore.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsIDOMCSSStyleSheet.h"
#include "nsICSSLoaderObserver.h"
#include "nsTArrayForwardDeclare.h"
#include "nsString.h"
#include "mozilla/CORSMode.h"
#include "nsCycleCollectionParticipant.h"
#include "nsWrapperCache.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "mozilla/dom/SRIMetadata.h"
class CSSRuleListImpl;
class nsCSSRuleProcessor;
class nsIPrincipal;
class nsIURI;
class nsMediaList;
class nsMediaQueryResultCacheKey;
class nsStyleSet;
class nsPresContext;
class nsXMLNameSpaceMap;
namespace mozilla {
struct ChildSheetListBuilder;
class CSSStyleSheet;
namespace css {
class Rule;
class GroupRule;
class ImportRule;
} // namespace css
namespace dom {
class CSSRuleList;
} // namespace dom
// -------------------------------
// CSS Style Sheet Inner Data Container
//
class CSSStyleSheetInner : public StyleSheetInfo
{
public:
friend class mozilla::CSSStyleSheet;
friend class ::nsCSSRuleProcessor;
private:
CSSStyleSheetInner(CSSStyleSheet* aPrimarySheet,
CORSMode aCORSMode,
ReferrerPolicy aReferrerPolicy,
const dom::SRIMetadata& aIntegrity);
CSSStyleSheetInner(CSSStyleSheetInner& aCopy,
CSSStyleSheet* aPrimarySheet);
~CSSStyleSheetInner();
CSSStyleSheetInner* CloneFor(CSSStyleSheet* aPrimarySheet);
void AddSheet(CSSStyleSheet* aSheet);
void RemoveSheet(CSSStyleSheet* aSheet);
void RebuildNameSpaces();
// Create a new namespace map
nsresult CreateNamespaceMap();
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
AutoTArray<CSSStyleSheet*, 8> mSheets;
IncrementalClearCOMRuleArray mOrderedRules;
nsAutoPtr<nsXMLNameSpaceMap> mNameSpaceMap;
// Linked list of child sheets. This is al fundamentally broken, because
// each of the child sheets has a unique parent... We can only hope (and
// currently this is the case) that any time page JS can get ts hands on a
// child sheet that means we've already ensured unique inners throughout its
// parent chain and things are good.
RefPtr<CSSStyleSheet> mFirstChild;
};
// -------------------------------
// CSS Style Sheet
//
// CID for the CSSStyleSheet class
// 7985c7ac-9ddc-444d-9899-0c86ec122f54
#define NS_CSS_STYLE_SHEET_IMPL_CID \
{ 0x7985c7ac, 0x9ddc, 0x444d, \
{ 0x98, 0x99, 0x0c, 0x86, 0xec, 0x12, 0x2f, 0x54 } }
class CSSStyleSheet final : public nsIDOMCSSStyleSheet,
public nsICSSLoaderObserver,
public nsWrapperCache,
public StyleSheet
{
public:
typedef net::ReferrerPolicy ReferrerPolicy;
CSSStyleSheet(CORSMode aCORSMode, ReferrerPolicy aReferrerPolicy);
CSSStyleSheet(CORSMode aCORSMode, ReferrerPolicy aReferrerPolicy,
const dom::SRIMetadata& aIntegrity);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(CSSStyleSheet,
nsIDOMCSSStyleSheet)
NS_DECLARE_STATIC_IID_ACCESSOR(NS_CSS_STYLE_SHEET_IMPL_CID)
nsIURI* GetSheetURI() const;
nsIURI* GetBaseURI() const;
void GetTitle(nsString& aTitle) const;
void GetType(nsString& aType) const;
bool HasRules() const;
/**
* Whether the sheet is applicable. A sheet that is not applicable
* should never be inserted into a style set. A sheet may not be
* applicable for a variety of reasons including being disabled and
* being incomplete.
*/
bool IsApplicable() const;
/**
* Set the stylesheet to be enabled. This may or may not make it
* applicable. Note that this WILL inform the sheet's document of
* its new applicable state if the state changes but WILL NOT call
* BeginUpdate() or EndUpdate() on the document -- calling those is
* the caller's responsibility. This allows use of SetEnabled when
* batched updates are desired. If you want updates handled for
* you, see nsIDOMStyleSheet::SetDisabled().
*/
void SetEnabled(bool aEnabled);
// style sheet owner info
CSSStyleSheet* GetParentSheet() const; // may be null
nsIDocument* GetOwningDocument() const; // may be null
void SetOwningDocument(nsIDocument* aDocument);
// Find the ID of the owner inner window.
uint64_t FindOwningWindowInnerID() const;
#ifdef DEBUG
void List(FILE* out = stdout, int32_t aIndent = 0) const;
#endif
void AppendStyleSheet(CSSStyleSheet* aSheet);
// XXX do these belong here or are they generic?
void AppendStyleRule(css::Rule* aRule);
int32_t StyleRuleCount() const;
css::Rule* GetStyleRuleAt(int32_t aIndex) const;
nsresult DeleteRuleFromGroup(css::GroupRule* aGroup, uint32_t aIndex);
nsresult InsertRuleIntoGroup(const nsAString& aRule, css::GroupRule* aGroup, uint32_t aIndex, uint32_t* _retval);
/**
* SetURIs must be called on all sheets before parsing into them.
* SetURIs may only be called while the sheet is 1) incomplete and 2)
* has no rules in it
*/
void SetURIs(nsIURI* aSheetURI, nsIURI* aOriginalSheetURI, nsIURI* aBaseURI);
/**
* SetPrincipal should be called on all sheets before parsing into them.
* This can only be called once with a non-null principal. Calling this with
* a null pointer is allowed and is treated as a no-op.
*/
void SetPrincipal(nsIPrincipal* aPrincipal);
// Principal() never returns a null pointer.
nsIPrincipal* Principal() const { return mInner->mPrincipal; }
void SetTitle(const nsAString& aTitle) { mTitle = aTitle; }
void SetMedia(nsMediaList* aMedia);
void SetOwnerRule(css::ImportRule* aOwnerRule) { mOwnerRule = aOwnerRule; /* Not ref counted */ }
css::ImportRule* GetOwnerRule() const { return mOwnerRule; }
nsXMLNameSpaceMap* GetNameSpaceMap() const { return mInner->mNameSpaceMap; }
already_AddRefed<CSSStyleSheet> Clone(CSSStyleSheet* aCloneParent,
css::ImportRule* aCloneOwnerRule,
nsIDocument* aCloneDocument,
nsINode* aCloneOwningNode) const;
bool IsModified() const { return mDirty; }
void SetModifiedByChildRule() {
NS_ASSERTION(mDirty,
"sheet must be marked dirty before handing out child rules");
DidDirty();
}
nsresult AddRuleProcessor(nsCSSRuleProcessor* aProcessor);
nsresult DropRuleProcessor(nsCSSRuleProcessor* aProcessor);
void AddStyleSet(nsStyleSet* aStyleSet);
void DropStyleSet(nsStyleSet* aStyleSet);
/**
* Like the DOM insertRule() method, but doesn't do any security checks
*/
nsresult InsertRuleInternal(const nsAString& aRule,
uint32_t aIndex, uint32_t* aReturn);
/* Get the URI this sheet was originally loaded from, if any. Can
return null */
nsIURI* GetOriginalURI() const { return mInner->mOriginalSheetURI; }
// Whether the sheet is for an inline <style> element.
bool IsInline() const { return mInner->IsInline(); }
// nsICSSLoaderObserver interface
NS_IMETHOD StyleSheetLoaded(StyleSheetHandle aSheet, bool aWasAlternate,
nsresult aStatus) override;
void EnsureUniqueInner();
// Append all of this sheet's child sheets to aArray.
void AppendAllChildSheets(nsTArray<CSSStyleSheet*>& aArray);
bool UseForPresentation(nsPresContext* aPresContext,
nsMediaQueryResultCacheKey& aKey) const;
nsresult ReparseSheet(const nsAString& aInput);
void SetInRuleProcessorCache() { mInRuleProcessorCache = true; }
// nsIDOMStyleSheet interface
NS_DECL_NSIDOMSTYLESHEET
// nsIDOMCSSStyleSheet interface
NS_DECL_NSIDOMCSSSTYLESHEET
// Function used as a callback to rebuild our inner's child sheet
// list after we clone a unique inner for ourselves.
static bool RebuildChildList(css::Rule* aRule, void* aBuilder);
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
// Get this style sheet's CORS mode
CORSMode GetCORSMode() const { return mInner->mCORSMode; }
// Get this style sheet's Referrer Policy
ReferrerPolicy GetReferrerPolicy() const { return mInner->mReferrerPolicy; }
// Get this style sheet's integrity metadata
void GetIntegrity(dom::SRIMetadata& aResult) const { aResult = mInner->mIntegrity; }
dom::Element* GetScopeElement() const { return mScopeElement; }
void SetScopeElement(dom::Element* aScopeElement)
{
mScopeElement = aScopeElement;
}
// WebIDL StyleSheet API
// Our CSSStyleSheet::GetType is a const method, so it ends up
// ambiguous with with the XPCOM version. Just disambiguate.
void GetType(nsString& aType) {
const_cast<const CSSStyleSheet*>(this)->GetType(aType);
}
// Our XPCOM GetHref is fine for WebIDL
nsINode* GetOwnerNode() const { return mOwningNode; }
CSSStyleSheet* GetParentStyleSheet() const { return mParent; }
// Our CSSStyleSheet::GetTitle is a const method, so it ends up
// ambiguous with with the XPCOM version. Just disambiguate.
void GetTitle(nsString& aTitle) {
const_cast<const CSSStyleSheet*>(this)->GetTitle(aTitle);
}
nsMediaList* Media();
bool Disabled() const { return mDisabled; }
// The XPCOM SetDisabled is fine for WebIDL
// WebIDL CSSStyleSheet API
// Can't be inline because we can't include ImportRule here. And can't be
// called GetOwnerRule because that would be ambiguous with the ImportRule
// version.
nsIDOMCSSRule* GetDOMOwnerRule() const;
dom::CSSRuleList* GetCssRules(ErrorResult& aRv);
uint32_t InsertRule(const nsAString& aRule, uint32_t aIndex,
ErrorResult& aRv) {
uint32_t retval;
aRv = InsertRule(aRule, aIndex, &retval);
return retval;
}
void DeleteRule(uint32_t aIndex, ErrorResult& aRv) {
aRv = DeleteRule(aIndex);
}
// WebIDL miscellaneous bits
dom::ParentObject GetParentObject() const {
if (mOwningNode) {
return dom::ParentObject(mOwningNode);
}
return dom::ParentObject(static_cast<nsIDOMCSSStyleSheet*>(mParent), mParent);
}
virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
// Changes to sheets should be inside of a WillDirty-DidDirty pair.
// However, the calls do not need to be matched; it's ok to call
// WillDirty and then make no change and skip the DidDirty call.
void WillDirty();
void DidDirty();
mozilla::dom::CSSStyleSheetParsingMode ParsingMode();
private:
CSSStyleSheet(const CSSStyleSheet& aCopy,
CSSStyleSheet* aParentToUse,
css::ImportRule* aOwnerRuleToUse,
nsIDocument* aDocumentToUse,
nsINode* aOwningNodeToUse);
CSSStyleSheet(const CSSStyleSheet& aCopy) = delete;
CSSStyleSheet& operator=(const CSSStyleSheet& aCopy) = delete;
protected:
virtual ~CSSStyleSheet();
void ClearRuleCascades();
// Return success if the subject principal subsumes the principal of our
// inner, error otherwise. This will also succeed if the subject has
// UniversalXPConnect or if access is allowed by CORS. In the latter case,
// it will set the principal of the inner to the subject principal.
nsresult SubjectSubsumesInnerPrincipal();
// Add the namespace mapping from this @namespace rule to our namespace map
nsresult RegisterNamespaceRule(css::Rule* aRule);
// Drop our reference to mRuleCollection
void DropRuleCollection();
// Drop our reference to mMedia
void DropMedia();
// Unlink our inner, if needed, for cycle collection
void UnlinkInner();
// Traverse our inner, if needed, for cycle collection
void TraverseInner(nsCycleCollectionTraversalCallback &);
protected:
nsString mTitle;
RefPtr<nsMediaList> mMedia;
RefPtr<CSSStyleSheet> mNext;
CSSStyleSheet* mParent; // weak ref
css::ImportRule* mOwnerRule; // weak ref
RefPtr<CSSRuleListImpl> mRuleCollection;
bool mDirty; // has been modified
bool mInRuleProcessorCache;
RefPtr<dom::Element> mScopeElement;
CSSStyleSheetInner* mInner;
AutoTArray<nsCSSRuleProcessor*, 8>* mRuleProcessors;
nsTArray<nsStyleSet*> mStyleSets;
friend class ::nsMediaList;
friend class ::nsCSSRuleProcessor;
friend class mozilla::StyleSheet;
friend struct mozilla::ChildSheetListBuilder;
};
NS_DEFINE_STATIC_IID_ACCESSOR(CSSStyleSheet, NS_CSS_STYLE_SHEET_IMPL_CID)
} // namespace mozilla
#endif /* !defined(mozilla_CSSStyleSheet_h) */