Function ArrayToLocaleString

iv/lv5/runtime/array.cc:165–222

section 15.4.4.3 Array.prototype.toLocaleString()

// section 15.4.4.3 Array.prototype.toLocaleString()
JSVal ArrayToLocaleString(const Arguments& args, Error* e) {
  IV_LV5_CONSTRUCTOR_CHECK("Array.prototype.toLocaleString", args, e);
  Context* const ctx = args.ctx();
  JSObject* const array = args.this_binding().ToObject(ctx, IV_LV5_ERROR(e));
  const uint32_t len = internal::GetLength(ctx, array, IV_LV5_ERROR(e));

  if (len == 0) {
    return JSString::NewEmptyString(ctx);
  }

  // implementation depended locale based separator
  const char separator = ',';
  const Symbol toLocaleString = symbol::toLocaleString();
  JSStringBuilder builder;
  {
    const JSVal first =
        array->Get(ctx, symbol::MakeSymbolFromIndex(0u), IV_LV5_ERROR(e));
    if (!first.IsNullOrUndefined()) {
      JSObject* const elm_obj = first.ToObject(ctx, IV_LV5_ERROR(e));
      const JSVal method = elm_obj->Get(ctx, toLocaleString, IV_LV5_ERROR(e));
      if (!method.IsCallable()) {
        e->Report(Error::Type, "toLocaleString is not function");
        return JSUndefined;
      }
      ScopedArguments args_list(ctx, 0, IV_LV5_ERROR(e));
      const JSVal R =
          static_cast<JSFunction*>(
              method.object())->Call(&args_list, elm_obj, IV_LV5_ERROR(e));
      const JSString* const str = R.ToString(ctx, IV_LV5_ERROR(e));
      builder.AppendJSString(*str);
    }
  }

  uint32_t k = 1;
  while (k < len) {
    builder.Append(separator);
    const JSVal element = array->Get(
        ctx,
        symbol::MakeSymbolFromIndex(k),
        IV_LV5_ERROR(e));
    if (!element.IsNullOrUndefined()) {
      JSObject* const elm_obj = element.ToObject(ctx, IV_LV5_ERROR(e));
      const JSVal method = elm_obj->Get(ctx, toLocaleString, IV_LV5_ERROR(e));
      if (!method.IsCallable()) {
        e->Report(Error::Type, "toLocaleString is not function");
        return JSUndefined;
      }
      ScopedArguments args_list(ctx, 0, IV_LV5_ERROR(e));
      const JSVal R =
          static_cast<JSFunction*>(
              method.object())->Call(&args_list, elm_obj, IV_LV5_ERROR(e));
      const JSString* const str = R.ToString(ctx, IV_LV5_ERROR(e));
      builder.AppendJSString(*str);
    }
    ++k;
  }
  return builder.Build(ctx, false, e);
}