dhisD2Functions function

String dhisD2Functions(String expression)

Implementation

String dhisD2Functions(String expression) {
  String updatedExpression = expression;

  RegExp regex = RegExp(r'd2:(\w+)\((.*?)\)');

  String replaceMatch(Match match) {
    String d2Argument = match.group(1) ?? '';
    String d2Value = match.group(2) ?? '';

    switch (d2Argument) {
      case 'hasValue':
        return d2hasValue(expression);
      case 'length':
        return d2Length(expression);
      case 'daysBetween':
        List<String> dates = d2Value.split(',');
        return DateUtils.daysBetween(dates[0], dates[1]).toString();
      case 'yearsBetween':
        List<String> dates = d2Value.split(',');
        return DateUtils.yearsBetween(dates[0], dates[1]).toString();
      case 'monthsBetween':
        List<String> dates = d2Value.split(',');
        return DateUtils.monthsBetween(dates[0], dates[1]).toString();
      default:
        return d2Value;
    }
  }

  // Replace all matches in the expression
  updatedExpression =
      expression.replaceAllMapped(regex, (match) => replaceMatch(match));

  updatedExpression = updatedExpression
      .replaceAll(r"!''", '1 == 1')
      .replaceAll('d2:length(' ')', '0')
      .replaceAll('d2:length( ' ' )', '0');

  RegExp notValueRegex = RegExp(r'!([^"]+)', caseSensitive: false);

  updatedExpression =
      updatedExpression.replaceAllMapped(notValueRegex, (match) {
    String content = match.group(1)?.trim() ?? '';
    if (content.isNotEmpty) {
      return '1 == 0';
    } else {
      return match.group(0) ?? '';
    }
  });

  return updatedExpression;
}