DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (d38398e5144e)

VCS Links

CSSStyleSheet

CSSStyleSheetInner

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
/* -*- 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 "nscore.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsICSSLoaderObserver.h"
#include "nsTArrayForwardDeclare.h"
#include "nsString.h"
#include "mozilla/CORSMode.h"
#include "nsCycleCollectionParticipant.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "mozilla/dom/SRIMetadata.h"

class CSSRuleListImpl;
class nsCSSRuleProcessor;
class nsIURI;
class nsMediaQueryResultCacheKey;
class nsStyleSet;
class nsPresContext;
class nsXMLNameSpaceMap;

namespace mozilla {
class CSSStyleSheet;
struct ChildSheetListBuilder;

namespace css {
class GroupRule;
} // namespace css
namespace dom {
class CSSRuleList;
} // namespace dom

  // -------------------------------
// CSS Style Sheet Inner Data Container
//

struct CSSStyleSheetInner : public StyleSheetInfo
{
  CSSStyleSheetInner(CORSMode aCORSMode,
                     ReferrerPolicy aReferrerPolicy,
                     const dom::SRIMetadata& aIntegrity);
  CSSStyleSheetInner(CSSStyleSheetInner& aCopy,
                     CSSStyleSheet* aPrimarySheet);
  ~CSSStyleSheetInner();

  CSSStyleSheetInner* CloneFor(CSSStyleSheet* aPrimarySheet);
  void RemoveSheet(StyleSheet* aSheet) override;

  void RebuildNameSpaces();

  // Create a new namespace map
  nsresult CreateNamespaceMap();

  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;

  IncrementalClearCOMRuleArray mOrderedRules;
  nsAutoPtr<nsXMLNameSpaceMap> mNameSpaceMap;
};


// -------------------------------
// 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 StyleSheet
                          , public nsICSSLoaderObserver
{
public:
  typedef net::ReferrerPolicy ReferrerPolicy;
  CSSStyleSheet(css::SheetParsingMode aParsingMode,
                CORSMode aCORSMode, ReferrerPolicy aReferrerPolicy);
  CSSStyleSheet(css::SheetParsingMode aParsingMode,
                CORSMode aCORSMode, ReferrerPolicy aReferrerPolicy,
                const dom::SRIMetadata& aIntegrity);

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(CSSStyleSheet, StyleSheet)

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_CSS_STYLE_SHEET_IMPL_CID)

  bool HasRules() const;

  // Find the ID of the owner inner window.
  uint64_t FindOwningWindowInnerID() const;
#ifdef DEBUG
  void List(FILE* out = stdout, int32_t aIndent = 0) const override;
#endif

  // 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);

  void SetOwnerRule(css::ImportRule* aOwnerRule) { mOwnerRule = aOwnerRule; /* Not ref counted */ }
  css::ImportRule* GetOwnerRule() const { return mOwnerRule; }
  // Workaround overloaded-virtual warning in GCC.
  using StyleSheet::GetOwnerRule;

  nsXMLNameSpaceMap* GetNameSpaceMap() const {
    return Inner()->mNameSpaceMap;
  }

  virtual already_AddRefed<StyleSheet> Clone(StyleSheet* aCloneParent,
    css::ImportRule* aCloneOwnerRule,
    nsIDocument* aCloneDocument,
    nsINode* aCloneOwningNode) const final;

  bool IsModified() const final { 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);

  // nsICSSLoaderObserver interface
  NS_IMETHOD StyleSheetLoaded(StyleSheet* 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; }

  // 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,
                               ChildSheetListBuilder* aBuilder);

  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override;

  dom::Element* GetScopeElement() const { return mScopeElement; }
  void SetScopeElement(dom::Element* aScopeElement)
  {
    mScopeElement = aScopeElement;
  }

  // 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.
  css::Rule* GetDOMOwnerRule() const final;

  void WillDirty();
  void DidDirty();

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();

  // Add the namespace mapping from this @namespace rule to our namespace map
  nsresult RegisterNamespaceRule(css::Rule* aRule);

  // Drop our reference to mRuleCollection
  void DropRuleCollection();

  CSSStyleSheetInner* Inner() const
  {
    return static_cast<CSSStyleSheetInner*>(mInner);
  }

  // Unlink our inner, if needed, for cycle collection
  virtual void UnlinkInner() override;
  // Traverse our inner, if needed, for cycle collection
  virtual void TraverseInner(nsCycleCollectionTraversalCallback &) override;

protected:
  // Internal methods which do not have security check and completeness check.
  dom::CSSRuleList* GetCssRulesInternal(ErrorResult& aRv);
  uint32_t InsertRuleInternal(const nsAString& aRule,
                              uint32_t aIndex, ErrorResult& aRv);
  void DeleteRuleInternal(uint32_t aIndex, ErrorResult& aRv);

  void EnabledStateChangedInternal();

  css::ImportRule*      mOwnerRule; // weak ref

  RefPtr<CSSRuleListImpl> mRuleCollection;
  bool                  mDirty; // has been modified 
  bool                  mInRuleProcessorCache;
  RefPtr<dom::Element> mScopeElement;

  AutoTArray<nsCSSRuleProcessor*, 8>* mRuleProcessors;
  nsTArray<nsStyleSet*> mStyleSets;

  friend class mozilla::StyleSheet;
  friend class ::nsCSSRuleProcessor;
};

NS_DEFINE_STATIC_IID_ACCESSOR(CSSStyleSheet, NS_CSS_STYLE_SHEET_IMPL_CID)

} // namespace mozilla

#endif /* !defined(mozilla_CSSStyleSheet_h) */