flatten static method

Map<String, String> flatten(Map<String, dynamic> translations)

Flattens a - possibly nested - map of translations into a flat map whose keys are dot-separated paths.

 flatten({'pages': {'task_list': {'title': 'Tasks'}}});
 // {'pages.task_list.title': 'Tasks'}

A map which is already flat is returned unchanged, which is what makes nested and dot-separated translation files interchangeable. Values which are neither a map nor a string are converted with toString().

Implementation

static Map<String, String> flatten(Map<String, dynamic> translations) {
  Map<String, String> flat = {};

  void visit(String prefix, Map<dynamic, dynamic> map) {
    map.forEach((key, value) {
      String path = prefix.isEmpty ? '$key' : '$prefix.$key';
      if (value is Map) {
        visit(path, value);
      } else {
        flat[path] = '$value';
      }
    });
  }

  visit('', translations);
  return flat;
}