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<RawServoImportRule> 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   MOZ_ASSERT(sheet);
  24   mChildSheet = const_cast<StyleSheet*>(sheet);
  25   mChildSheet->SetOwnerRule(this);
  26 }
  27
  28 CSSImportRule::~CSSImportRule() {
  29   if (mChildSheet) {
  30     mChildSheet->SetOwnerRule(nullptr);
  31   }
  32 }
  33
  34 // QueryInterface implementation for CSSImportRule
  35 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CSSImportRule)
  36 NS_INTERFACE_MAP_END_INHERITING(css::Rule)
  37
  38 NS_IMPL_CYCLE_COLLECTION_CLASS(CSSImportRule)
  39
  40 NS_IMPL_ADDREF_INHERITED(CSSImportRule, css::Rule)
  41 NS_IMPL_RELEASE_INHERITED(CSSImportRule, css::Rule)
  42
  43 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSImportRule, css::Rule)
  44   // Note the child sheet twice, since the Servo rule also holds a strong
  45   // reference to it.
  46   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mChildSheet");
  47   cb.NoteXPCOMChild(tmp->mChildSheet);
  48   MOZ_ASSERT_IF(tmp->mRawRule,
  49                 Servo_ImportRule_GetSheet(tmp->mRawRule) == tmp->mChildSheet);
  50   cb.NoteXPCOMChild(tmp->mChildSheet);
  51   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mRawRule.stylesheet");
  52 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  53
  54 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CSSImportRule)
  55   if (tmp->mChildSheet) {
  56     tmp->mChildSheet->SetOwnerRule(nullptr);
  57     tmp->mChildSheet = nullptr;
  58   }
  59   tmp->mRawRule = nullptr;
  60 NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(css::Rule)
  61
  62 #ifdef DEBUG
  63 /* virtual */
  64 void CSSImportRule::List(FILE* out, int32_t aIndent) const {
  65   nsAutoCString str;
  66   for (int32_t i = 0; i < aIndent; i++) {
  67     str.AppendLiteral("  ");
  68   }
  69   Servo_ImportRule_Debug(mRawRule, &str);
  70   fprintf_stderr(out, "%s\n", str.get());
  71 }
  72 #endif
  73
  74 dom::MediaList* CSSImportRule::GetMedia() const {
  75   // When Bug 1326509 is fixed, we can assert mChildSheet instead.
  76   return mChildSheet ? mChildSheet->Media() : nullptr;
  77 }
  78
  79 void CSSImportRule::DropSheetReference() {
  80   if (mChildSheet) {
  81     mChildSheet->RemoveFromParent();
  82   }
  83   Rule::DropSheetReference();
  84 }
  85
  86 void CSSImportRule::GetHref(nsAString& aHref) const {
  87   Servo_ImportRule_GetHref(mRawRule, &aHref);
  88 }
  89
  90 /* virtual */
  91 void CSSImportRule::GetCssText(nsAString& aCssText) const {
  92   Servo_ImportRule_GetCssText(mRawRule, &aCssText);
  93 }
  94
  95 /* virtual */
  96 size_t CSSImportRule::SizeOfIncludingThis(
  97     mozilla::MallocSizeOf aMallocSizeOf) const {
  98   // TODO Implement this!
  99   return aMallocSizeOf(this);
 100 }
 101
 102 bool CSSImportRule::IsCCLeaf() const {
 103   // We're not a leaf.
 104   return false;
 105 }
 106
 107 /* virtual */
 108 JSObject* CSSImportRule::WrapObject(JSContext* aCx,
 109                                     JS::Handle<JSObject*> aGivenProto) {
 110   return CSSImportRule_Binding::Wrap(aCx, this, aGivenProto);
 111 }
 112
 113 }  // namespace dom
 114 }  // namespace mozilla