flatten static method

Map<String, dynamic> flatten(Map<String, dynamic> json, [ String prefix = '' ])

Flatten nested JSON keys for O(1) lookup.

Public so a caller building its own TranslationLoader (see MagicTest.loadTranslations) can flatten with the exact same rule the translator's own loader uses, rather than growing a second copy that silently drifts from this one.

Example:

JsonAssetLoader.flatten({'auth': {'failed': 'Error'}}); // {'auth.failed': 'Error'}

Implementation

static Map<String, dynamic> flatten(
  Map<String, dynamic> json, [
  String prefix = '',
]) {
  final result = <String, dynamic>{};

  for (final entry in json.entries) {
    final key = prefix.isEmpty ? entry.key : '$prefix.${entry.key}';

    if (entry.value is Map<String, dynamic>) {
      result.addAll(flatten(entry.value as Map<String, dynamic>, key));
    } else {
      result[key] = entry.value;
    }
  }

  return result;
}