1 files changed, 69 insertions, 0 deletions
diff --git a/js/src/builtin/intl/ListFormat.h b/js/src/builtin/intl/ListFormat.h
new file mode 100644
index 0000000000..da0daa711b
--- /dev/null
+++ b/js/src/builtin/intl/ListFormat.h
@@ -0,0 +1,69 @@
+/* -*- 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/. */
+
+#ifndef builtin_intl_ListFormat_h
+#define builtin_intl_ListFormat_h
+
+#include <stdint.h>
+
+#include "builtin/SelfHostingDefines.h"
+#include "js/Class.h"
+#include "js/TypeDecls.h"
+#include "vm/NativeObject.h"
+
+namespace mozilla::intl {
+class ListFormat;
+}  // namespace mozilla::intl
+
+namespace js {
+
+class ListFormatObject : public NativeObject {
+ public:
+  static const JSClass class_;
+  static const JSClass& protoClass_;
+
+  static constexpr uint32_t INTERNALS_SLOT = 0;
+  static constexpr uint32_t LIST_FORMAT_SLOT = 1;
+  static constexpr uint32_t SLOT_COUNT = 2;
+
+  static_assert(INTERNALS_SLOT == INTL_INTERNALS_OBJECT_SLOT,
+                "INTERNALS_SLOT must match self-hosting define for internals "
+                "object slot");
+
+  // Estimated memory use for UListFormatter (see IcuMemoryUsage).
+  static constexpr size_t EstimatedMemoryUse = 24;
+
+  mozilla::intl::ListFormat* getListFormatSlot() const {
+    const auto& slot = getFixedSlot(LIST_FORMAT_SLOT);
+    if (slot.isUndefined()) {
+      return nullptr;
+    }
+    return static_cast<mozilla::intl::ListFormat*>(slot.toPrivate());
+  }
+
+  void setListFormatSlot(mozilla::intl::ListFormat* format) {
+    setFixedSlot(LIST_FORMAT_SLOT, PrivateValue(format));
+  }
+
+ private:
+  static const JSClassOps classOps_;
+  static const ClassSpec classSpec_;
+
+  static void finalize(JS::GCContext* gcx, JSObject* obj);
+};
+
+/**
+ * Returns a string representing the array of string values |list| according to
+ * the effective locale and the formatting options of the given ListFormat.
+ *
+ * Usage: formatted = intl_FormatList(listFormat, list, formatToParts)
+ */
+[[nodiscard]] extern bool intl_FormatList(JSContext* cx, unsigned argc,
+                                          Value* vp);
+
+}  // namespace js
+
+#endif /* builtin_intl_ListFormat_h */