parseTwoLines static method

MrzResult parseTwoLines(String line1, String line2)

Parse two lines of MRZ string.

Implementation

static MrzResult parseTwoLines(String line1, String line2) {
  MrzResult mrzInfo = MrzResult();
  String type = line1.substring(0, 1);
  RegExp exp = RegExp(r'[I|P|V]');
  RegExpMatch? match = exp.firstMatch(type);
  if (match == null) {
    return mrzInfo;
  }

  if (type == 'P') {
    mrzInfo.type = 'PASSPORT (TD-3)';
  } else if (type == 'V') {
    if (line1.length == 44) {
      mrzInfo.type = 'VISA (MRV-A)';
    } else if (line1.length == 36) {
      mrzInfo.type = 'VISA (MRV-B)';
    }
  } else if (type == 'I') {
    mrzInfo.type = 'ID CARD (TD-2)';
  }

  // Get issuing State information
  String nation = line1.substring(2, 5);
  exp = RegExp(r'[0-9]');
  match = exp.firstMatch(nation);
  if (match != null) return mrzInfo;
  if (nation[nation.length - 1] == '<') {
    nation = nation.substring(0, 2);
  }
  mrzInfo.nationality = nation;
  // Get surname information
  line1 = line1.substring(5);
  int pos = line1.indexOf('<<');
  String surName = line1.substring(0, pos);
  exp = RegExp(r'[0-9]');
  match = exp.firstMatch(surName);
  if (match != null) return mrzInfo;
  surName = surName.replaceAll('<', ' ');
  mrzInfo.surname = surName;
  // Get givenname information
  String givenName = line1.substring(surName.length + 2);
  exp = RegExp(r'[0-9]');
  match = exp.firstMatch(givenName);
  if (match != null) return mrzInfo;
  givenName = givenName.replaceAll('<', ' ');
  givenName = givenName.trim();
  mrzInfo.givenName = givenName;
  // Get passport number information
  String passportNumber = '';
  passportNumber = line2.substring(0, 9);
  passportNumber = passportNumber.replaceAll('<', ' ');
  mrzInfo.passportNumber = passportNumber;
  // Get Nationality information
  String issueCountry = line2.substring(10, 13);
  exp = RegExp(r'[0-9]');
  match = exp.firstMatch(issueCountry);
  if (match != null) return mrzInfo;
  if (issueCountry[issueCountry.length - 1] == '<') {
    issueCountry = issueCountry.substring(0, 2);
  }
  mrzInfo.issuingCountry = issueCountry;
  // Get date of birth information
  String birth = line2.substring(13, 19);
  DateTime now = DateTime.now();
  int currentYear = now.year;
  if (int.parse(birth.substring(0, 2)) > (currentYear % 100)) {
    birth = '19$birth';
  } else {
    birth = '20$birth';
  }
  birth =
      '${birth.substring(0, 4)}/${birth.substring(4, 6)}/${birth.substring(6, 8)}';
  mrzInfo.birthDate = birth;

  // Get gender information
  String gender = line2[20];
  exp = RegExp(r'[M|F|x|<]');
  match = exp.firstMatch(gender);
  if (match == null) return mrzInfo;
  mrzInfo.gender = gender;
  // Get date of expiry information
  String expiry = line2.substring(21, 27);
  exp = RegExp(r'[A-Za-z]');
  match = exp.firstMatch(expiry);
  if (match != null) return mrzInfo;
  if (int.parse(expiry.substring(0, 2)) >= 60) {
    expiry = '19$expiry';
  } else {
    expiry = '20$expiry';
  }
  expiry =
      '${expiry.substring(0, 4)}/${expiry.substring(4, 6)}/${expiry.substring(6)}';
  mrzInfo.expiration = expiry;

  return mrzInfo;
}