class SimpleTemplate {
  String? tpl;

  SimpleTemplate({this.tpl});

  String fetch(Map<String, String> params) {
    if (tpl == null) return "";

    var re = RegExp(r"{{(?<name>[^,;:'\n]+?)}}");

    return tpl!.replaceAllMapped(re, (match) {
      var key = match.group(1)!.trim();
      if (params.containsKey(key)) {
        return params[key]!;
      }
      return match.group(0)!;
    });
  }
}