1 files changed, 183 insertions, 0 deletions
diff --git a/layout/style/CSSMarginRule.cpp b/layout/style/CSSMarginRule.cpp
new file mode 100644
index 0000000000..64a706666c
--- /dev/null
+++ b/layout/style/CSSMarginRule.cpp
@@ -0,0 +1,183 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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/CSSMarginRule.h"
+#include "mozilla/dom/CSSMarginRuleBinding.h"
+
+#include "mozilla/DeclarationBlock.h"
+#include "mozilla/ServoBindings.h"
+
+namespace mozilla::dom {
+
+// -- CSSMarginRuleDeclaration ---------------------------------------
+
+CSSMarginRuleDeclaration::CSSMarginRuleDeclaration(
+    already_AddRefed<StyleLockedDeclarationBlock> aDecls)
+    : mDecls(new DeclarationBlock(std::move(aDecls))) {
+  mDecls->SetOwningRule(Rule());
+}
+
+CSSMarginRuleDeclaration::~CSSMarginRuleDeclaration() {
+  mDecls->SetOwningRule(nullptr);
+}
+
+// QueryInterface implementation for CSSMarginRuleDeclaration
+NS_INTERFACE_MAP_BEGIN(CSSMarginRuleDeclaration)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  // We forward the cycle collection interfaces to Rule(), which is
+  // never null (in fact, we're part of that object!)
+  if (aIID.Equals(NS_GET_IID(nsCycleCollectionISupports)) ||
+      aIID.Equals(NS_GET_IID(nsXPCOMCycleCollectionParticipant))) {
+    return Rule()->QueryInterface(aIID, aInstancePtr);
+  }
+NS_INTERFACE_MAP_END_INHERITING(nsDOMCSSDeclaration)
+
+NS_IMPL_ADDREF_USING_AGGREGATOR(CSSMarginRuleDeclaration, Rule())
+NS_IMPL_RELEASE_USING_AGGREGATOR(CSSMarginRuleDeclaration, Rule())
+
+/* nsDOMCSSDeclaration implementation */
+css::Rule* CSSMarginRuleDeclaration::GetParentRule() { return Rule(); }
+
+nsINode* CSSMarginRuleDeclaration::GetAssociatedNode() const {
+  return Rule()->GetAssociatedDocumentOrShadowRoot();
+}
+
+nsISupports* CSSMarginRuleDeclaration::GetParentObject() const {
+  return Rule()->GetParentObject();
+}
+
+DeclarationBlock* CSSMarginRuleDeclaration::GetOrCreateCSSDeclaration(
+    Operation aOperation, DeclarationBlock** aCreated) {
+  if (aOperation != Operation::Read) {
+    if (StyleSheet* sheet = Rule()->GetStyleSheet()) {
+      sheet->WillDirty();
+    }
+  }
+  return mDecls;
+}
+
+void CSSMarginRuleDeclaration::SetRawAfterClone(
+    RefPtr<StyleLockedDeclarationBlock> aDeclarationBlock) {
+  mDecls->SetOwningRule(nullptr);
+  mDecls = new DeclarationBlock(aDeclarationBlock.forget());
+  mDecls->SetOwningRule(Rule());
+}
+
+nsresult CSSMarginRuleDeclaration::SetCSSDeclaration(
+    DeclarationBlock* aDecl, MutationClosureData* aClosureData) {
+  MOZ_ASSERT(aDecl, "must be non-null");
+  CSSMarginRule* rule = Rule();
+
+  if (aDecl != mDecls) {
+    mDecls->SetOwningRule(nullptr);
+    RefPtr<DeclarationBlock> decls = aDecl;
+    // TODO alaskanemily: bug 1890418 for implementing this and margin-rule
+    // style properties in general.
+    // Servo_MarginRule_SetStyle(rule->Raw(), decls->Raw());
+    mDecls = std::move(decls);
+    mDecls->SetOwningRule(rule);
+  }
+
+  return NS_OK;
+}
+
+nsDOMCSSDeclaration::ParsingEnvironment
+CSSMarginRuleDeclaration::GetParsingEnvironment(
+    nsIPrincipal* aSubjectPrincipal) const {
+  return GetParsingEnvironmentForRule(Rule(), StyleCssRuleType::Margin);
+}
+
+// -- CSSMarginRule --------------------------------------------------
+
+CSSMarginRule::CSSMarginRule(RefPtr<StyleMarginRule> aRawRule,
+                             StyleSheet* aSheet, css::Rule* aParentRule,
+                             uint32_t aLine, uint32_t aColumn)
+    : css::Rule(aSheet, aParentRule, aLine, aColumn),
+      mRawRule(std::move(aRawRule)),
+      mDecls(Servo_MarginRule_GetStyle(mRawRule).Consume()) {}
+
+NS_IMPL_ADDREF_INHERITED(CSSMarginRule, css::Rule)
+NS_IMPL_RELEASE_INHERITED(CSSMarginRule, css::Rule)
+
+// QueryInterface implementation for MarginRule
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CSSMarginRule)
+NS_INTERFACE_MAP_END_INHERITING(css::Rule)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(CSSMarginRule)
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(CSSMarginRule, css::Rule)
+  // Keep this in sync with IsCCLeaf.
+
+  // Trace the wrapper for our declaration.  This just expands out
+  // NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER which we can't use
+  // directly because the wrapper is on the declaration, not on us.
+  tmp->mDecls.TraceWrapper(aCallbacks, aClosure);
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CSSMarginRule)
+  // Keep this in sync with IsCCLeaf.
+
+  // Unlink the wrapper for our declaration.
+  //
+  // Note that this has to happen before unlinking css::Rule.
+  tmp->UnlinkDeclarationWrapper(tmp->mDecls);
+  tmp->mDecls.mDecls->SetOwningRule(nullptr);
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(css::Rule)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSMarginRule, css::Rule)
+  // Keep this in sync with IsCCLeaf.
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+bool CSSMarginRule::IsCCLeaf() const {
+  if (!Rule::IsCCLeaf()) {
+    return false;
+  }
+
+  return !mDecls.PreservingWrapper();
+}
+
+void CSSMarginRule::SetRawAfterClone(RefPtr<StyleMarginRule> aRaw) {
+  mRawRule = std::move(aRaw);
+  mDecls.SetRawAfterClone(Servo_MarginRule_GetStyle(mRawRule.get()).Consume());
+}
+
+// WebIDL interfaces
+StyleCssRuleType CSSMarginRule::Type() const {
+  return StyleCssRuleType::Margin;
+}
+
+// CSSRule implementation
+
+void CSSMarginRule::GetCssText(nsACString& aCssText) const {
+  Servo_MarginRule_GetCssText(mRawRule, &aCssText);
+}
+
+void CSSMarginRule::GetName(nsACString& aRuleName) const {
+  Servo_MarginRule_GetName(mRawRule, &aRuleName);
+}
+
+size_t CSSMarginRule::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
+  // TODO Implement this!
+  return aMallocSizeOf(this);
+}
+
+#ifdef DEBUG
+void CSSMarginRule::List(FILE* out, int32_t aIndent) const {
+  nsAutoCString str;
+  for (int32_t i = 0; i < aIndent; i++) {
+    str.AppendLiteral("  ");
+  }
+  Servo_MarginRule_Debug(mRawRule, &str);
+  fprintf_stderr(out, "%s\n", str.get());
+}
+#endif
+
+JSObject* CSSMarginRule::WrapObject(JSContext* aCx,
+                                    JS::Handle<JSObject*> aGivenProto) {
+  return CSSMarginRule_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+}  // namespace mozilla::dom