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CSSImportRule.cpp (4834B)

      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/ServoBindings.h"
     10 #include "mozilla/StyleSheet.h"
     11 #include "mozilla/dom/CSSImportRuleBinding.h"
     12 #include "mozilla/dom/MediaList.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