1 files changed, 92 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCWrappedJSIterator.cpp b/js/xpconnect/src/XPCWrappedJSIterator.cpp
new file mode 100644
index 0000000000..0e980311ff
--- /dev/null
+++ b/js/xpconnect/src/XPCWrappedJSIterator.cpp
@@ -0,0 +1,92 @@
+/* -*- 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 "xpcprivate.h"
+
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/Try.h"
+#include "mozilla/dom/IteratorResultBinding.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/ScriptSettings.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace xpc;
+
+NS_IMPL_CYCLE_COLLECTION(XPCWrappedJSIterator, mEnum, mGlobal, mNext)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(XPCWrappedJSIterator)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(XPCWrappedJSIterator)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(XPCWrappedJSIterator)
+  NS_INTERFACE_MAP_ENTRY(nsISimpleEnumerator)
+  NS_INTERFACE_MAP_ENTRY(nsISimpleEnumeratorBase)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, XPCWrappedJSIterator)
+NS_INTERFACE_MAP_END
+
+XPCWrappedJSIterator::XPCWrappedJSIterator(nsIJSEnumerator* aEnum)
+    : mEnum(aEnum) {
+  nsCOMPtr<nsIXPConnectWrappedJS> wrapped = do_QueryInterface(aEnum);
+  MOZ_ASSERT(wrapped);
+  mGlobal = NativeGlobal(wrapped->GetJSObjectGlobal());
+}
+
+nsresult XPCWrappedJSIterator::HasMoreElements(bool* aRetVal) {
+  if (mHasNext.isNothing()) {
+    AutoJSAPI jsapi;
+    MOZ_ALWAYS_TRUE(jsapi.Init(mGlobal));
+
+    JSContext* cx = jsapi.cx();
+
+    JS::RootedValue val(cx);
+    MOZ_TRY(mEnum->Next(cx, &val));
+
+    RootedDictionary<IteratorResult> result(cx);
+    if (!result.Init(cx, val)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    if (!result.mDone) {
+      if (result.mValue.isObject()) {
+        JS::RootedObject obj(cx, &result.mValue.toObject());
+
+        nsresult rv;
+        if (!XPCConvert::JSObject2NativeInterface(cx, getter_AddRefs(mNext),
+                                                  obj, &NS_GET_IID(nsISupports),
+                                                  nullptr, &rv)) {
+          return rv;
+        }
+      } else {
+        mNext = XPCVariant::newVariant(cx, result.mValue);
+      }
+    }
+    mHasNext = Some(!result.mDone);
+  }
+  *aRetVal = *mHasNext;
+  return NS_OK;
+}
+
+nsresult XPCWrappedJSIterator::GetNext(nsISupports** aRetVal) {
+  bool hasMore;
+  MOZ_TRY(HasMoreElements(&hasMore));
+  if (!hasMore) {
+    return NS_ERROR_FAILURE;
+  }
+
+  mNext.forget(aRetVal);
+  mHasNext = Nothing();
+  return NS_OK;
+}
+
+nsresult XPCWrappedJSIterator::Iterator(nsIJSEnumerator** aRetVal) {
+  nsCOMPtr<nsIJSEnumerator> jsEnum = mEnum;
+  jsEnum.forget(aRetVal);
+  return NS_OK;
+}
+
+nsresult XPCWrappedJSIterator::Entries(const nsID&, nsIJSEnumerator** aRetVal) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}