showControlCodes method

String showControlCodes({ String open = '', String close = '', String abbrOpen = '[', String abbrClose = ']', ControlCodeStyle preferStyle = ControlCodeStyle.escape, })

Show control codes.

Implementation

String showControlCodes({
  String open = '',
  String close = '',
  String abbrOpen = '[',
  String abbrClose = ']',
  ControlCodeStyle preferStyle = ControlCodeStyle.escape,
}) {
  final buf = StringBuffer();

  for (final charCode in codeUnits) {
    final controlCode = ControlFunctionsC0.byIndex(charCode);

    if (controlCode == null) {
      buf.writeCharCode(charCode);
    } else {
      switch (preferStyle) {
        case ControlCodeStyle.abbr:
          buf
            ..write(open)
            ..write(abbrOpen)
            ..write(controlCode.name)
            ..write(abbrClose)
            ..write(close);

        case ControlCodeStyle.unicodeSymbol:
          final symbol = controlCode.unicodeSymbol;
          buf
            ..write(open)
            ..write(symbol)
            ..write(close);

        case ControlCodeStyle.escape when controlCode.escapeSymbol != null:
          buf
            ..write(open)
            ..write(controlCode.escapeSymbol)
            ..write(close);

        case ControlCodeStyle.escape:
        case ControlCodeStyle.charCode:
          buf
            ..write(open)
            ..write(r'\x')
            ..write(charCode.toRadixString(16).toUpperCase().padLeft(2, '0'))
            ..write(close);
      }
    }
  }

  return buf.toString();
}