From 5b19cea74ffb2419022990adb6a18241e7f8103d Mon Sep 17 00:00:00 2001
From: Andreas Farre <farre@mozilla.com>
Date: Wed, 26 May 2021 07:14:05 +0000
Subject: [PATCH] Part 4: Bug 1700623 - Add js value conversion for Record.
 r=peterv

Depends on D111430

Differential Revision: https://phabricator.services.mozilla.com/D111431
---
 dom/bindings/ToJSValue.h | 41 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/dom/bindings/ToJSValue.h b/dom/bindings/ToJSValue.h
index 22ade817453f..3a4097b19e2a 100644
--- a/dom/bindings/ToJSValue.h
+++ b/dom/bindings/ToJSValue.h
@@ -23,9 +23,10 @@
 #include "mozilla/Unused.h"            // for Unused
 #include "mozilla/dom/BindingUtils.h"  // for MaybeWrapValue, MaybeWrapObjectOrNullValue, XPCOMObjectToJsval, GetOrCreateDOMReflector
 #include "mozilla/dom/CallbackObject.h"  // for CallbackObject
-#include "nsID.h"                        // for NS_GET_TEMPLATE_IID, nsIID
-#include "nsISupports.h"                 // for nsISupports
-#include "nsStringFwd.h"                 // for nsAString
+#include "mozilla/dom/Record.h"
+#include "nsID.h"         // for NS_GET_TEMPLATE_IID, nsIID
+#include "nsISupports.h"  // for nsISupports
+#include "nsStringFwd.h"  // for nsAString
 #include "nsTArrayForwardDeclare.h"
 #include "xpcObjectHelper.h"  // for xpcObjectHelper
 
@@ -399,6 +400,40 @@ template <typename T>
   return true;
 }
 
+// Accept records of other things we accept. N.B. This assumes that
+// keys are either UTF-8 or UTF-16-ish. See Bug 1706058.
+template <typename K, typename V>
+[[nodiscard]] bool ToJSValue(JSContext* aCx, const Record<K, V>& aArgument,
+                             JS::MutableHandle<JS::Value> aValue) {
+  JS::RootedObject recordObj(aCx, JS_NewPlainObject(aCx));
+  if (!recordObj) {
+    return false;
+  }
+
+  for (auto& entry : aArgument.Entries()) {
+    JS::Rooted<JS::Value> value(aCx);
+    if (!ToJSValue(aCx, entry.mValue, &value)) {
+      return false;
+    }
+
+    if constexpr (std::is_same_v<nsCString, decltype(entry.mKey)>) {
+      NS_ConvertUTF8toUTF16 expandedKey(entry.mKey);
+      if (!JS_DefineUCProperty(aCx, recordObj, expandedKey.BeginReading(),
+                               expandedKey.Length(), value, JSPROP_ENUMERATE)) {
+        return false;
+      }
+    } else {
+      if (!JS_DefineUCProperty(aCx, recordObj, entry.mKey.BeginReading(),
+                               entry.mKey.Length(), value, JSPROP_ENUMERATE)) {
+        return false;
+      }
+    }
+  }
+
+  aValue.setObject(*recordObj);
+  return true;
+}
+
 }  // namespace dom
 }  // namespace mozilla