layout/style/CSSImportRule.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/CSSImportRule.h"
   8
   9 #include "mozilla/dom/CSSImportRuleBinding.h"
  10 #include "mozilla/dom/MediaList.h"
  11 #include "mozilla/ServoBindings.h"
  12 #include "mozilla/StyleSheet.h"
  13
  14 namespace mozilla {
  15 namespace dom {
  16
  17 CSSImportRule::CSSImportRule(RefPtr<StyleLockedImportRule> aRawRule,
  18                              StyleSheet* aSheet, css::Rule* aParentRule,
  19                              uint32_t aLine, uint32_t aColumn)
  20     : css::Rule(aSheet, aParentRule, aLine, aColumn),
  21       mRawRule(std::move(aRawRule)) {
  22   const auto* sheet = Servo_ImportRule_GetSheet(mRawRule.get());
  23   mChildSheet = const_cast<StyleSheet*>(sheet);
  24   if (mChildSheet) {
  25     mChildSheet->AddReferencingRule(*this);
  26   }
  27 }
  28
  29 CSSImportRule::~CSSImportRule() {
  30   if (mChildSheet) {
  31     mChildSheet->RemoveReferencingRule(*this);
  32   }
  33 }
  34
  35 // QueryInterface implementation for CSSImportRule
  36 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CSSImportRule)
  37 NS_INTERFACE_MAP_END_INHERITING(css::Rule)
  38
  39 NS_IMPL_CYCLE_COLLECTION_CLASS(CSSImportRule)
  40
  41 NS_IMPL_ADDREF_INHERITED(CSSImportRule, css::Rule)
  42 NS_IMPL_RELEASE_INHERITED(CSSImportRule, css::Rule)
  43
  44 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSImportRule, css::Rule)
  45   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mChildSheet");
  46   cb.NoteXPCOMChild(tmp->mChildSheet);
  47   MOZ_ASSERT_IF(tmp->mRawRule,
  48                 Servo_ImportRule_GetSheet(tmp->mRawRule) == tmp->mChildSheet);
  49   // Note the child sheet twice, since the Servo rule also holds a strong
  50   // reference to it, but only if we're the "primary" rule reference.
  51   if (tmp->mChildSheet && tmp->mChildSheet->GetOwnerRule() == tmp) {
  52     NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mRawRule.stylesheet");
  53     cb.NoteXPCOMChild(tmp->mChildSheet);
  54   }
  55 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  56
  57 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CSSImportRule)
  58   if (tmp->mChildSheet) {
  59     tmp->mChildSheet->RemoveReferencingRule(*tmp);
  60     tmp->mChildSheet = nullptr;
  61   }
  62   tmp->mRawRule = nullptr;
  63 NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(css::Rule)
  64
  65 #ifdef DEBUG
  66 /* virtual */
  67 void CSSImportRule::List(FILE* out, int32_t aIndent) const {
  68   nsAutoCString str;
  69   for (int32_t i = 0; i < aIndent; i++) {
  70     str.AppendLiteral("  ");
  71   }
  72   Servo_ImportRule_Debug(mRawRule, &str);
  73   fprintf_stderr(out, "%s\n", str.get());
  74 }
  75 #endif
  76
  77 StyleCssRuleType CSSImportRule::Type() const {
  78   return StyleCssRuleType::Import;
  79 }
  80
  81 void CSSImportRule::SetRawAfterClone(RefPtr<StyleLockedImportRule> aRaw) {
  82   mRawRule = std::move(aRaw);
  83   if (mChildSheet) {
  84     mChildSheet->RemoveReferencingRule(*this);
  85   }
  86   mChildSheet =
  87       const_cast<StyleSheet*>(Servo_ImportRule_GetSheet(mRawRule.get()));
  88   if (mChildSheet) {
  89     mChildSheet->AddReferencingRule(*this);
  90   }
  91 }
  92
  93 StyleSheet* CSSImportRule::GetStyleSheetForBindings() {
  94   if (mChildSheet) {
  95     // FIXME(emilio): This is needed to make sure we don't expose shared sheets
  96     // to the OM (see wpt /css/cssom/cssimportrule-sheet-identity.html for
  97     // example).
  98     //
  99     // Perhaps instead we could create a clone of the stylesheet and keep it in
 100     // mChildSheet, without calling EnsureUniqueInner(), or something like that?
 101     if (StyleSheet* parent = GetParentStyleSheet()) {
 102       parent->EnsureUniqueInner();
 103     }
 104   }
 105   return mChildSheet;
 106 }
 107
 108 dom::MediaList* CSSImportRule::GetMedia() {
 109   auto* sheet = GetStyleSheetForBindings();
 110   return sheet ? sheet->Media() : nullptr;
 111 }
 112
 113 void CSSImportRule::DropSheetReference() {
 114   if (mChildSheet) {
 115     mChildSheet->RemoveFromParent();
 116   }
 117   Rule::DropSheetReference();
 118 }
 119
 120 void CSSImportRule::GetHref(nsAString& aHref) const {
 121   Servo_ImportRule_GetHref(mRawRule, &aHref);
 122 }
 123
 124 void CSSImportRule::GetLayerName(nsACString& aName) const {
 125   Servo_ImportRule_GetLayerName(mRawRule, &aName);
 126 }
 127
 128 void CSSImportRule::GetSupportsText(nsACString& aSupportsText) const {
 129   Servo_ImportRule_GetSupportsText(mRawRule, &aSupportsText);
 130 }
 131
 132 /* virtual */
 133 void CSSImportRule::GetCssText(nsACString& aCssText) const {
 134   Servo_ImportRule_GetCssText(mRawRule, &aCssText);
 135 }
 136
 137 /* virtual */
 138 size_t CSSImportRule::SizeOfIncludingThis(
 139     mozilla::MallocSizeOf aMallocSizeOf) const {
 140   // TODO Implement this!
 141   return aMallocSizeOf(this);
 142 }
 143
 144 bool CSSImportRule::IsCCLeaf() const {
 145   // We're not a leaf.
 146   return false;
 147 }
 148
 149 /* virtual */
 150 JSObject* CSSImportRule::WrapObject(JSContext* aCx,
 151                                     JS::Handle<JSObject*> aGivenProto) {
 152   return CSSImportRule_Binding::Wrap(aCx, this, aGivenProto);
 153 }
 154
 155 }  // namespace dom
 156 }  // namespace mozilla