1 files changed, 59 insertions, 0 deletions
diff --git a/toolkit/components/extensions/DocumentObserver.h b/toolkit/components/extensions/DocumentObserver.h
new file mode 100644
index 0000000000..b9b0dc6f78
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+++ b/toolkit/components/extensions/DocumentObserver.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* 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/. */
+
+#ifndef mozilla_extensions_DocumentObserver_h
+#define mozilla_extensions_DocumentObserver_h
+
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/MozDocumentObserverBinding.h"
+
+#include "mozilla/extensions/WebExtensionContentScript.h"
+
+class nsILoadInfo;
+class nsPIDOMWindowOuter;
+
+namespace mozilla {
+namespace extensions {
+
+class DocumentObserver final : public nsISupports, public nsWrapperCache {
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(DocumentObserver)
+
+  static already_AddRefed<DocumentObserver> Constructor(
+      dom::GlobalObject& aGlobal, dom::MozDocumentCallback& aCallbacks);
+
+  void Observe(const dom::Sequence<OwningNonNull<MozDocumentMatcher>>& matchers,
+               ErrorResult& aRv);
+
+  void Disconnect();
+
+  const nsTArray<RefPtr<MozDocumentMatcher>>& Matchers() const {
+    return mMatchers;
+  }
+
+  void NotifyMatch(MozDocumentMatcher& aMatcher, nsPIDOMWindowOuter* aWindow);
+  void NotifyMatch(MozDocumentMatcher& aMatcher, nsILoadInfo* aLoadInfo);
+
+  nsISupports* GetParentObject() const { return mParent; }
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+ protected:
+  virtual ~DocumentObserver() = default;
+
+ private:
+  explicit DocumentObserver(nsISupports* aParent,
+                            dom::MozDocumentCallback& aCallbacks)
+      : mParent(aParent), mCallbacks(&aCallbacks) {}
+
+  nsCOMPtr<nsISupports> mParent;
+  RefPtr<dom::MozDocumentCallback> mCallbacks;
+  nsTArray<RefPtr<MozDocumentMatcher>> mMatchers;
+};
+
+}  // namespace extensions
+}  // namespace mozilla
+
+#endif  // mozilla_extensions_DocumentObserver_h