1 files changed, 235 insertions, 0 deletions
diff --git a/layout/style/CSSStyleRule.cpp b/layout/style/CSSStyleRule.cpp
new file mode 100644
index 0000000000..780a2c4ad7
--- /dev/null
+++ b/layout/style/CSSStyleRule.cpp
@@ -0,0 +1,235 @@
+/* -*- 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/CSSStyleRule.h"
+
+#include "mozilla/CSSEnabledState.h"
+#include "mozilla/DeclarationBlock.h"
+#include "mozilla/PseudoStyleType.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/dom/CSSStyleRuleBinding.h"
+#include "nsCSSPseudoElements.h"
+
+#include "mozAutoDocUpdate.h"
+
+using namespace mozilla::dom;
+
+namespace mozilla {
+namespace dom {
+
+// -- CSSStyleRuleDeclaration ---------------------------------------
+
+CSSStyleRuleDeclaration::CSSStyleRuleDeclaration(
+    already_AddRefed<RawServoDeclarationBlock> aDecls)
+    : mDecls(new DeclarationBlock(std::move(aDecls))) {}
+
+CSSStyleRuleDeclaration::~CSSStyleRuleDeclaration() {
+  mDecls->SetOwningRule(nullptr);
+}
+
+// QueryInterface implementation for CSSStyleRuleDeclaration
+NS_INTERFACE_MAP_BEGIN(CSSStyleRuleDeclaration)
+  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(CSSStyleRuleDeclaration, Rule())
+NS_IMPL_RELEASE_USING_AGGREGATOR(CSSStyleRuleDeclaration, Rule())
+
+/* nsDOMCSSDeclaration implementation */
+
+css::Rule* CSSStyleRuleDeclaration::GetParentRule() { return Rule(); }
+
+nsINode* CSSStyleRuleDeclaration::GetParentObject() {
+  return Rule()->GetParentObject();
+}
+
+DeclarationBlock* CSSStyleRuleDeclaration::GetOrCreateCSSDeclaration(
+    Operation aOperation, DeclarationBlock** aCreated) {
+  return mDecls;
+}
+
+nsresult CSSStyleRuleDeclaration::SetCSSDeclaration(
+    DeclarationBlock* aDecl, MutationClosureData* aClosureData) {
+  CSSStyleRule* rule = Rule();
+
+  if (rule->IsReadOnly()) {
+    return NS_OK;
+  }
+
+  if (RefPtr<StyleSheet> sheet = rule->GetStyleSheet()) {
+    if (aDecl != mDecls) {
+      mDecls->SetOwningRule(nullptr);
+      RefPtr<DeclarationBlock> decls = aDecl;
+      Servo_StyleRule_SetStyle(rule->Raw(), decls->Raw());
+      mDecls = std::move(decls);
+      mDecls->SetOwningRule(rule);
+    }
+    sheet->RuleChanged(rule, StyleRuleChangeKind::StyleRuleDeclarations);
+  }
+  return NS_OK;
+}
+
+Document* CSSStyleRuleDeclaration::DocToUpdate() { return nullptr; }
+
+nsDOMCSSDeclaration::ParsingEnvironment
+CSSStyleRuleDeclaration::GetParsingEnvironment(
+    nsIPrincipal* aSubjectPrincipal) const {
+  return GetParsingEnvironmentForRule(Rule(), CSSRule_Binding::STYLE_RULE);
+}
+
+// -- CSSStyleRule --------------------------------------------------
+
+CSSStyleRule::CSSStyleRule(already_AddRefed<RawServoStyleRule> aRawRule,
+                           StyleSheet* aSheet, css::Rule* aParentRule,
+                           uint32_t aLine, uint32_t aColumn)
+    : BindingStyleRule(aSheet, aParentRule, aLine, aColumn),
+      mRawRule(aRawRule),
+      mDecls(Servo_StyleRule_GetStyle(mRawRule).Consume()) {}
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(CSSStyleRule, css::Rule)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(CSSStyleRule)
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(CSSStyleRule, 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(CSSStyleRule)
+  // 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);
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_PTR
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(css::Rule)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSStyleRule, css::Rule)
+  // Keep this in sync with IsCCLeaf.
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+bool CSSStyleRule::IsCCLeaf() const {
+  if (!Rule::IsCCLeaf()) {
+    return false;
+  }
+
+  return !mDecls.PreservingWrapper();
+}
+
+size_t CSSStyleRule::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
+  size_t n = aMallocSizeOf(this);
+
+  // Measurement of the following members may be added later if DMD finds it
+  // is worthwhile:
+  // - mRawRule
+  // - mDecls
+
+  return n;
+}
+
+#ifdef DEBUG
+void CSSStyleRule::List(FILE* out, int32_t aIndent) const {
+  nsAutoCString str;
+  for (int32_t i = 0; i < aIndent; i++) {
+    str.AppendLiteral("  ");
+  }
+  Servo_StyleRule_Debug(mRawRule, &str);
+  fprintf_stderr(out, "%s\n", str.get());
+}
+#endif
+
+/* CSSRule implementation */
+
+void CSSStyleRule::GetCssText(nsACString& aCssText) const {
+  Servo_StyleRule_GetCssText(mRawRule, &aCssText);
+}
+
+nsICSSDeclaration* CSSStyleRule::Style() { return &mDecls; }
+
+/* CSSStyleRule implementation */
+
+void CSSStyleRule::GetSelectorText(nsACString& aSelectorText) {
+  Servo_StyleRule_GetSelectorText(mRawRule, &aSelectorText);
+}
+
+void CSSStyleRule::SetSelectorText(const nsACString& aSelectorText) {
+  if (IsReadOnly()) {
+    return;
+  }
+
+  if (RefPtr<StyleSheet> sheet = GetStyleSheet()) {
+    // StyleRule lives inside of the Inner, it is unsafe to call WillDirty
+    // if sheet does not already have a unique Inner.
+    sheet->AssertHasUniqueInner();
+    sheet->WillDirty();
+
+    // TODO(emilio): May actually be more efficient to handle this as rule
+    // removal + addition, from the point of view of invalidation...
+    const RawServoStyleSheetContents* contents = sheet->RawContents();
+    if (Servo_StyleRule_SetSelectorText(contents, mRawRule, &aSelectorText)) {
+      sheet->RuleChanged(this, StyleRuleChangeKind::Generic);
+    }
+  }
+}
+
+uint32_t CSSStyleRule::GetSelectorCount() {
+  uint32_t aCount;
+  Servo_StyleRule_GetSelectorCount(mRawRule, &aCount);
+  return aCount;
+}
+
+nsresult CSSStyleRule::GetSelectorText(uint32_t aSelectorIndex,
+                                       nsACString& aText) {
+  Servo_StyleRule_GetSelectorTextAtIndex(mRawRule, aSelectorIndex, &aText);
+  return NS_OK;
+}
+
+nsresult CSSStyleRule::GetSpecificity(uint32_t aSelectorIndex,
+                                      uint64_t* aSpecificity) {
+  Servo_StyleRule_GetSpecificityAtIndex(mRawRule, aSelectorIndex, aSpecificity);
+  return NS_OK;
+}
+
+nsresult CSSStyleRule::SelectorMatchesElement(Element* aElement,
+                                              uint32_t aSelectorIndex,
+                                              const nsAString& aPseudo,
+                                              bool aRelevantLinkVisited,
+                                              bool* aMatches) {
+  PseudoStyleType pseudoType = PseudoStyleType::NotPseudo;
+  if (!aPseudo.IsEmpty()) {
+    RefPtr<nsAtom> pseudoElt = NS_Atomize(aPseudo);
+    pseudoType = nsCSSPseudoElements::GetPseudoType(
+        pseudoElt, CSSEnabledState::IgnoreEnabledState);
+
+    if (pseudoType == PseudoStyleType::NotPseudo) {
+      *aMatches = false;
+      return NS_OK;
+    }
+  }
+
+  *aMatches = Servo_StyleRule_SelectorMatchesElement(
+      mRawRule, aElement, aSelectorIndex, pseudoType, aRelevantLinkVisited);
+
+  return NS_OK;
+}
+
+NotNull<DeclarationBlock*> CSSStyleRule::GetDeclarationBlock() const {
+  return WrapNotNull(mDecls.mDecls);
+}
+
+}  // namespace dom
+}  // namespace mozilla