ansiShowControlCodes method

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

Show control codes.

Implementation

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

  void abbrToBuf(String abbr) {
    buf
      ..write(open)
      ..write(abbrOpen)
      ..write(abbr)
      ..write(abbrClose)
      ..write(close);
  }

  void unicodeToBuf(String unicodeSymbol) {
    buf
      ..write(open)
      ..write(unicodeSymbol)
      ..write(close);
  }

  void escapeCodeToBuf(String escapeSymbol) {
    buf
      ..write(open)
      ..write(escapeSymbol)
      ..write(close);
  }

  void charCodeToBuf(int charCode) {
    buf
      ..write(open)
      ..write(r'\x')
      ..write(charCode.toRadixString(16).toUpperCase().padLeft(2, '0'))
      ..write(close);
  }

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

    if (controlCode == null) {
      buf.writeCharCode(charCode);
    } else {
      switch (preferStyle) {
        case ControlCodeStyle.charCode:
          charCodeToBuf(charCode);

        case ControlCodeStyle.abbr:
          abbrToBuf(controlCode.name);

        case ControlCodeStyle.unicode:
          unicodeToBuf(controlCode.unicodeSymbol);

        case ControlCodeStyle.escapeOrCharCode:
          if (controlCode.escapeSymbol case final escapeSymbol?) {
            escapeCodeToBuf(escapeSymbol);
          } else {
            charCodeToBuf(charCode);
          }

        case ControlCodeStyle.escapeOrAbbr:
          if (controlCode.escapeSymbol case final escapeSymbol?) {
            escapeCodeToBuf(escapeSymbol);
          } else {
            abbrToBuf(controlCode.name);
          }

        case ControlCodeStyle.escapeOrUnicode:
          if (controlCode.escapeSymbol case final escapeSymbol?) {
            escapeCodeToBuf(escapeSymbol);
          } else {
            unicodeToBuf(controlCode.unicodeSymbol);
          }
      }
    }
  }

  return buf.toString();
}