string static method

String string(String uuid)

Parse a string to a valid 128-bit UUID. Throws FormatException if the string does not hold a valid UUID format.

Implementation

static String string(String uuid) {
  uuid = uuid.trim();
  if (uuid.length < 4) {
    throw const FormatException('Invalid UUID');
  }

  if (uuid.startsWith('0x')) {
    uuid = uuid.substring(2);
  }

  if (uuid.length <= 8) {
    uuid = "${uuid.padLeft(8, '0')}-0000-1000-8000-00805f9b34fb";
  }

  if (!uuid.contains("-")) {
    if (uuid.length != 32) throw const FormatException("Invalid UUID");

    uuid = "${uuid.substring(0, 8)}-${uuid.substring(8, 12)}"
        "-${uuid.substring(12, 16)}-${uuid.substring(16, 20)}-${uuid.substring(20, 32)}";
  }

  var groups = uuid.split('-');

  if (groups.length != 5 ||
      groups[0].length != 8 ||
      groups[1].length != 4 ||
      groups[2].length != 4 ||
      groups[3].length != 4 ||
      groups[4].length != 12) {
    throw const FormatException('Invalid UUID');
  }

  try {
    int.parse(groups[0], radix: 16);
    int.parse(groups[1], radix: 16);
    int.parse(groups[2], radix: 16);
    int.parse(groups[3], radix: 16);
    int.parse(groups[4], radix: 16);
  } catch (e) {
    throw const FormatException('Invalid UUID');
  }

  return uuid.toLowerCase();
}