createReferenceString static method

String? createReferenceString(String? book, [ int? startChapter, int? startVerse, int? endChapter, int? endVerse, ])

Creates a String reference based on which fields are left null.

Does not validate references beyond checkin to see if the book field is left null. In cases where the book field is left null a null value will be returned.

Implementation

static String? createReferenceString(String? book,
    [int? startChapter, int? startVerse, int? endChapter, int? endVerse]) {
  if (book == null) return null;
  var reference = StringBuffer(book);
  if (startChapter != null) {
    reference.write(' $startChapter');
    if (startVerse != null) {
      reference.write(':$startVerse');
      if (endChapter != null && endChapter != startChapter) {
        reference.write(' - $endChapter');
        reference
            .write(':${endVerse ?? getLastVerseNumber(endChapter) ?? 1}');
      } else if (endVerse != null && endVerse != startVerse) {
        reference.write('-$endVerse');
      }
    } else if (endChapter != null && endChapter != startChapter) {
      if (endVerse != null) {
        reference.write(':1 - $endChapter:$endVerse');
      } else {
        reference.write('-$endChapter');
      }
    }
  }
  return reference.toString();
}