stringMap method

Implementation

Map<String, String>? stringMap(String key) {
  final value = map[key];
  if (value == null) {
    return null;
  }
  if (value is! YamlMap) {
    throw valueError(key, 'expected a mapping, found ${describe(value)}.');
  }
  final result = <String, String>{};
  for (final MapEntry(key: entryKey, value: node) in value.nodes.entries) {
    final name = (entryKey as YamlNode).value;
    final entryValue = node.value;
    if (name is! String) {
      throw ConfigException(
        '${keyPath(key)}: keys must be text.',
        span: SourceSpanLike.of(entryKey),
        file: file,
      );
    }
    if (entryValue is String || entryValue is num || entryValue is bool) {
      result[name] = entryValue.toString();
    } else {
      throw ConfigException(
        '${keyPath(key)}.$name: expected text, found '
        '${describe(entryValue)}.',
        span: SourceSpanLike.of(node),
        file: file,
      );
    }
  }
  return result;
}