registerHelper method

bool registerHelper(String name, dynamic helper(List, Function?))

registers a helper function that can be used in templates. All helpers are available across the all template

Implementation

bool registerHelper(String name, Function(List<dynamic>, Function?) helper) {
  if (name.isEmpty) {
    throw Exception('Helper\'s name should be provided');
  } else {
    var regExp = RegExp(
      r'^[a-zA-Z_]+\w+$',
      caseSensitive: false,
      multiLine: false,
    );

    if (!regExp.hasMatch(name)) {
      throw Exception('Wrong helper name specified');
    }
  }

  if (!_helpers.containsKey(name)) {
    _helpers[name] = helper;
    return true;
  }

  return false;
}