gecko-dev/layout/style/nsCSSStyleSheet.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 nsCSSStyleSheet_h_
#define nsCSSStyleSheet_h_
#include "mozilla/Attributes.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/Element.h"
#include "nscore.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsIStyleSheet.h"
#include "nsIDOMCSSStyleSheet.h"
#include "nsICSSLoaderObserver.h"
#include "nsCOMArray.h"
#include "nsTArray.h"
#include "nsString.h"
#include "mozilla/CORSMode.h"
#include "nsCycleCollectionParticipant.h"
#include "nsWrapperCache.h"
class nsXMLNameSpaceMap;
class nsCSSRuleProcessor;
class nsIPrincipal;
class nsIURI;
class nsMediaList;
class nsMediaQueryResultCacheKey;
class nsCSSStyleSheet;
class nsPresContext;
namespace mozilla {
namespace css {
class Rule;
class GroupRule;
class ImportRule;
}
}
// -------------------------------
// CSS Style Sheet Inner Data Container
//
class nsCSSStyleSheetInner {
public:
friend class nsCSSStyleSheet;
friend class nsCSSRuleProcessor;
private:
nsCSSStyleSheetInner(nsCSSStyleSheet* aPrimarySheet,
mozilla::CORSMode aCORSMode);
nsCSSStyleSheetInner(nsCSSStyleSheetInner& aCopy,
nsCSSStyleSheet* aPrimarySheet);
~nsCSSStyleSheetInner();
nsCSSStyleSheetInner* CloneFor(nsCSSStyleSheet* aPrimarySheet);
void AddSheet(nsCSSStyleSheet* aSheet);
void RemoveSheet(nsCSSStyleSheet* aSheet);
void RebuildNameSpaces();
// Create a new namespace map
nsresult CreateNamespaceMap();
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
nsAutoTArray<nsCSSStyleSheet*, 8> mSheets;
nsCOMPtr<nsIURI> mSheetURI; // for error reports, etc.
nsCOMPtr<nsIURI> mOriginalSheetURI; // for GetHref. Can be null.
nsCOMPtr<nsIURI> mBaseURI; // for resolving relative URIs
nsCOMPtr<nsIPrincipal> mPrincipal;
nsCOMArray<mozilla::css::Rule> 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.
nsRefPtr<nsCSSStyleSheet> mFirstChild;
mozilla::CORSMode mCORSMode;
bool mComplete;
#ifdef DEBUG
bool mPrincipalSet;
#endif
};
// -------------------------------
// CSS Style Sheet
//
class CSSRuleListImpl;
// CID for the nsCSSStyleSheet class
// ca926f30-2a7e-477e-8467-803fb32af20a
#define NS_CSS_STYLE_SHEET_IMPL_CID \
{ 0xca926f30, 0x2a7e, 0x477e, \
{ 0x84, 0x67, 0x80, 0x3f, 0xb3, 0x2a, 0xf2, 0x0a } }
class nsCSSStyleSheet MOZ_FINAL : public nsIStyleSheet,
public nsIDOMCSSStyleSheet,
public nsICSSLoaderObserver,
public nsWrapperCache
{
public:
nsCSSStyleSheet(mozilla::CORSMode aCORSMode);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsCSSStyleSheet,
nsIStyleSheet)
NS_DECLARE_STATIC_IID_ACCESSOR(NS_CSS_STYLE_SHEET_IMPL_CID)
// nsIStyleSheet interface
virtual nsIURI* GetSheetURI() const MOZ_OVERRIDE;
virtual nsIURI* GetBaseURI() const MOZ_OVERRIDE;
virtual void GetTitle(nsString& aTitle) const MOZ_OVERRIDE;
virtual void GetType(nsString& aType) const MOZ_OVERRIDE;
virtual bool HasRules() const MOZ_OVERRIDE;
virtual bool IsApplicable() const MOZ_OVERRIDE;
virtual void SetEnabled(bool aEnabled) MOZ_OVERRIDE;
virtual bool IsComplete() const MOZ_OVERRIDE;
virtual void SetComplete() MOZ_OVERRIDE;
virtual nsIStyleSheet* GetParentSheet() const MOZ_OVERRIDE; // may be null
virtual nsIDocument* GetOwningDocument() const MOZ_OVERRIDE; // may be null
virtual void SetOwningDocument(nsIDocument* aDocument) MOZ_OVERRIDE;
// Find the ID of the owner inner window.
uint64_t FindOwningWindowInnerID() const;
#ifdef DEBUG
virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
#endif
void AppendStyleSheet(nsCSSStyleSheet* aSheet);
void InsertStyleSheetAt(nsCSSStyleSheet* aSheet, int32_t aIndex);
// XXX do these belong here or are they generic?
void PrependStyleRule(mozilla::css::Rule* aRule);
void AppendStyleRule(mozilla::css::Rule* aRule);
void ReplaceStyleRule(mozilla::css::Rule* aOld, mozilla::css::Rule* aNew);
int32_t StyleRuleCount() const;
mozilla::css::Rule* GetStyleRuleAt(int32_t aIndex) const;
nsresult DeleteRuleFromGroup(mozilla::css::GroupRule* aGroup, uint32_t aIndex);
nsresult InsertRuleIntoGroup(const nsAString& aRule, mozilla::css::GroupRule* aGroup, uint32_t aIndex, uint32_t* _retval);
nsresult ReplaceRuleInGroup(mozilla::css::GroupRule* aGroup, mozilla::css::Rule* aOld, mozilla::css::Rule* aNew);
int32_t StyleSheetCount() const;
/**
* 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; }
// The document this style sheet is associated with. May be null
nsIDocument* GetDocument() const { return mDocument; }
void SetTitle(const nsAString& aTitle) { mTitle = aTitle; }
void SetMedia(nsMediaList* aMedia);
void SetOwningNode(nsINode* aOwningNode) { mOwningNode = aOwningNode; /* Not ref counted */ }
void SetOwnerRule(mozilla::css::ImportRule* aOwnerRule) { mOwnerRule = aOwnerRule; /* Not ref counted */ }
mozilla::css::ImportRule* GetOwnerRule() const { return mOwnerRule; }
nsXMLNameSpaceMap* GetNameSpaceMap() const { return mInner->mNameSpaceMap; }
already_AddRefed<nsCSSStyleSheet> Clone(nsCSSStyleSheet* aCloneParent,
mozilla::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);
/**
* 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 */
virtual nsIURI* GetOriginalURI() const;
// nsICSSLoaderObserver interface
NS_IMETHOD StyleSheetLoaded(nsCSSStyleSheet* aSheet, bool aWasAlternate,
nsresult aStatus) MOZ_OVERRIDE;
enum EnsureUniqueInnerResult {
// No work was needed to ensure a unique inner.
eUniqueInner_AlreadyUnique,
// A clone was done to ensure a unique inner (which means the style
// rules in this sheet have changed).
eUniqueInner_ClonedInner,
// A clone was attempted, but it failed.
eUniqueInner_CloneFailed
};
EnsureUniqueInnerResult EnsureUniqueInner();
// Append all of this sheet's child sheets to aArray. Return true
// on success and false on allocation failure.
bool AppendAllChildSheets(nsTArray<nsCSSStyleSheet*>& aArray);
bool UseForPresentation(nsPresContext* aPresContext,
nsMediaQueryResultCacheKey& aKey) const;
nsresult ParseSheet(const nsAString& aInput);
// 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(mozilla::css::Rule* aRule, void* aBuilder);
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
// Get this style sheet's CORS mode
mozilla::CORSMode GetCORSMode() const { return mInner->mCORSMode; }
mozilla::dom::Element* GetScopeElement() const { return mScopeElement; }
void SetScopeElement(mozilla::dom::Element* aScopeElement)
{
mScopeElement = aScopeElement;
}
// WebIDL StyleSheet API
// Our nsIStyleSheet::GetType is a const method, so it ends up
// ambiguous with with the XPCOM version. Just disambiguate.
void GetType(nsString& aType) {
const_cast<const nsCSSStyleSheet*>(this)->GetType(aType);
}
// Our XPCOM GetHref is fine for WebIDL
nsINode* GetOwnerNode() const { return mOwningNode; }
nsCSSStyleSheet* GetParentStyleSheet() const { return mParent; }
// Our nsIStyleSheet::GetTitle is a const method, so it ends up
// ambiguous with with the XPCOM version. Just disambiguate.
void GetTitle(nsString& aTitle) {
const_cast<const nsCSSStyleSheet*>(this)->GetTitle(aTitle);
}
nsIDOMMediaList* 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;
nsIDOMCSSRuleList* GetCssRules(mozilla::ErrorResult& aRv);
uint32_t InsertRule(const nsAString& aRule, uint32_t aIndex,
mozilla::ErrorResult& aRv) {
uint32_t retval;
aRv = InsertRule(aRule, aIndex, &retval);
return retval;
}
void DeleteRule(uint32_t aIndex, mozilla::ErrorResult& aRv) {
aRv = DeleteRule(aIndex);
}
// WebIDL miscellaneous bits
mozilla::dom::ParentObject GetParentObject() const {
if (mOwningNode) {
return mozilla::dom::ParentObject(mOwningNode);
}
return mozilla::dom::ParentObject(static_cast<nsIStyleSheet*>(mParent),
mParent);
}
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aScope) MOZ_OVERRIDE;
private:
nsCSSStyleSheet(const nsCSSStyleSheet& aCopy,
nsCSSStyleSheet* aParentToUse,
mozilla::css::ImportRule* aOwnerRuleToUse,
nsIDocument* aDocumentToUse,
nsINode* aOwningNodeToUse);
nsCSSStyleSheet(const nsCSSStyleSheet& aCopy) MOZ_DELETE;
nsCSSStyleSheet& operator=(const nsCSSStyleSheet& aCopy) MOZ_DELETE;
protected:
virtual ~nsCSSStyleSheet();
void ClearRuleCascades();
nsresult WillDirty();
void DidDirty();
// 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(mozilla::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;
nsRefPtr<nsMediaList> mMedia;
nsRefPtr<nsCSSStyleSheet> mNext;
nsCSSStyleSheet* mParent; // weak ref
mozilla::css::ImportRule* mOwnerRule; // weak ref
nsRefPtr<CSSRuleListImpl> mRuleCollection;
nsIDocument* mDocument; // weak ref; parents maintain this for their children
nsINode* mOwningNode; // weak ref
bool mDisabled;
bool mDirty; // has been modified
nsRefPtr<mozilla::dom::Element> mScopeElement;
nsCSSStyleSheetInner* mInner;
nsAutoTArray<nsCSSRuleProcessor*, 8>* mRuleProcessors;
friend class nsMediaList;
friend class nsCSSRuleProcessor;
friend struct ChildSheetListBuilder;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsCSSStyleSheet, NS_CSS_STYLE_SHEET_IMPL_CID)
#endif /* !defined(nsCSSStyleSheet_h_) */