1 files changed, 156 insertions, 0 deletions
diff --git a/layout/style/CSSImportRule.cpp b/layout/style/CSSImportRule.cpp
new file mode 100644
index 0000000000..6ff6b4d44e
--- /dev/null
+++ b/layout/style/CSSImportRule.cpp
@@ -0,0 +1,156 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "mozilla/dom/CSSImportRule.h"
+
+#include "mozilla/dom/CSSImportRuleBinding.h"
+#include "mozilla/dom/MediaList.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/StyleSheet.h"
+
+namespace mozilla {
+namespace dom {
+
+CSSImportRule::CSSImportRule(RefPtr<StyleLockedImportRule> aRawRule,
+                             StyleSheet* aSheet, css::Rule* aParentRule,
+                             uint32_t aLine, uint32_t aColumn)
+    : css::Rule(aSheet, aParentRule, aLine, aColumn),
+      mRawRule(std::move(aRawRule)) {
+  const auto* sheet = Servo_ImportRule_GetSheet(mRawRule.get());
+  mChildSheet = const_cast<StyleSheet*>(sheet);
+  if (mChildSheet) {
+    mChildSheet->AddReferencingRule(*this);
+  }
+}
+
+CSSImportRule::~CSSImportRule() {
+  if (mChildSheet) {
+    mChildSheet->RemoveReferencingRule(*this);
+  }
+}
+
+// QueryInterface implementation for CSSImportRule
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CSSImportRule)
+NS_INTERFACE_MAP_END_INHERITING(css::Rule)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(CSSImportRule)
+
+NS_IMPL_ADDREF_INHERITED(CSSImportRule, css::Rule)
+NS_IMPL_RELEASE_INHERITED(CSSImportRule, css::Rule)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSImportRule, css::Rule)
+  NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mChildSheet");
+  cb.NoteXPCOMChild(tmp->mChildSheet);
+  MOZ_ASSERT_IF(tmp->mRawRule,
+                Servo_ImportRule_GetSheet(tmp->mRawRule) == tmp->mChildSheet);
+  // Note the child sheet twice, since the Servo rule also holds a strong
+  // reference to it, but only if we're the "primary" rule reference.
+  if (tmp->mChildSheet && tmp->mChildSheet->GetOwnerRule() == tmp) {
+    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mRawRule.stylesheet");
+    cb.NoteXPCOMChild(tmp->mChildSheet);
+  }
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CSSImportRule)
+  if (tmp->mChildSheet) {
+    tmp->mChildSheet->RemoveReferencingRule(*tmp);
+    tmp->mChildSheet = nullptr;
+  }
+  tmp->mRawRule = nullptr;
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(css::Rule)
+
+#ifdef DEBUG
+/* virtual */
+void CSSImportRule::List(FILE* out, int32_t aIndent) const {
+  nsAutoCString str;
+  for (int32_t i = 0; i < aIndent; i++) {
+    str.AppendLiteral("  ");
+  }
+  Servo_ImportRule_Debug(mRawRule, &str);
+  fprintf_stderr(out, "%s\n", str.get());
+}
+#endif
+
+StyleCssRuleType CSSImportRule::Type() const {
+  return StyleCssRuleType::Import;
+}
+
+void CSSImportRule::SetRawAfterClone(RefPtr<StyleLockedImportRule> aRaw) {
+  mRawRule = std::move(aRaw);
+  if (mChildSheet) {
+    mChildSheet->RemoveReferencingRule(*this);
+  }
+  mChildSheet =
+      const_cast<StyleSheet*>(Servo_ImportRule_GetSheet(mRawRule.get()));
+  if (mChildSheet) {
+    mChildSheet->AddReferencingRule(*this);
+  }
+}
+
+StyleSheet* CSSImportRule::GetStyleSheetForBindings() {
+  if (mChildSheet) {
+    // FIXME(emilio): This is needed to make sure we don't expose shared sheets
+    // to the OM (see wpt /css/cssom/cssimportrule-sheet-identity.html for
+    // example).
+    //
+    // Perhaps instead we could create a clone of the stylesheet and keep it in
+    // mChildSheet, without calling EnsureUniqueInner(), or something like that?
+    if (StyleSheet* parent = GetParentStyleSheet()) {
+      parent->EnsureUniqueInner();
+    }
+  }
+  return mChildSheet;
+}
+
+dom::MediaList* CSSImportRule::GetMedia() {
+  auto* sheet = GetStyleSheetForBindings();
+  return sheet ? sheet->Media() : nullptr;
+}
+
+void CSSImportRule::DropSheetReference() {
+  if (mChildSheet) {
+    mChildSheet->RemoveFromParent();
+  }
+  Rule::DropSheetReference();
+}
+
+void CSSImportRule::GetHref(nsAString& aHref) const {
+  Servo_ImportRule_GetHref(mRawRule, &aHref);
+}
+
+void CSSImportRule::GetLayerName(nsACString& aName) const {
+  Servo_ImportRule_GetLayerName(mRawRule, &aName);
+}
+
+void CSSImportRule::GetSupportsText(nsACString& aSupportsText) const {
+  Servo_ImportRule_GetSupportsText(mRawRule, &aSupportsText);
+}
+
+/* virtual */
+void CSSImportRule::GetCssText(nsACString& aCssText) const {
+  Servo_ImportRule_GetCssText(mRawRule, &aCssText);
+}
+
+/* virtual */
+size_t CSSImportRule::SizeOfIncludingThis(
+    mozilla::MallocSizeOf aMallocSizeOf) const {
+  // TODO Implement this!
+  return aMallocSizeOf(this);
+}
+
+bool CSSImportRule::IsCCLeaf() const {
+  // We're not a leaf.
+  return false;
+}
+
+/* virtual */
+JSObject* CSSImportRule::WrapObject(JSContext* aCx,
+                                    JS::Handle<JSObject*> aGivenProto) {
+  return CSSImportRule_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+}  // namespace dom
+}  // namespace mozilla