toPersianWords method

String toPersianWords([ dynamic ordinal = false ])

Implementation

String toPersianWords([ordinal = false]) {
  final _this = this;
  if (_this == null) return 'NaN';
  if (this == 0) return 'صفر';
  if (ordinal && _this.isNegative) throw 'Ordinal can\'t be negative';

  var result = _this.isNegative ? 'منفی ' : '';
  final number = _this.abs();

  if (number.toString().length <= 3) {
    var d12 = number % 100;
    var d3 = (number / 100).floor();

    if (d3 != 0) {
      result += persianNumHundreds[d3] + ' و ';
    }

    if ((d12 >= 10) && (d12 <= 19)) {
      result += persianNumTen_Twenty[d12 - 10];
    } else {
      var d2 = (d12 / 10).floor();
      if (d2 != 0) {
        result += persianNumDecimal[d2] + ' و ';
      }

      var d1 = d12 % 10;
      if (d1 != 0) {
        result += persianNumUnit[d1] + ' و ';
      }

      result = result.substring(0, result.length - 3);
    }
  } else {
    var padLen;
    switch (number.toString().length % 3) {
      case 1:
        padLen = 2;
        break;
      case 2:
        padLen = 1;
        break;
      default:
        padLen = 0;
    }
    var numStr = number
        .toString()
        .padLeft(number.toString().length + padLen as int, '0');
    final L = (numStr.length / 3 - 1).floor();
    int b;
    var threeZero = false;
    for (var i = 0; i <= L; i++) {
      b = int.parse(numStr.substring(i * 3, (i + 1) * 3));
      if (b != 0) {
        result += b.toPersianWords() + ' ' + persianNumBase[L - i] + ' و ';
        threeZero = false;
      } else if (b == 0 && i > 0) {
        threeZero = true;
      }
    }
    result = result.substring(
      0,
      threeZero ? result.length - 3 : result.length - 4,
    );
  }

  result = result.trim();

  if (!ordinal) {
    return result;
  } else {
    if (this == 1) {
      return 'اول';
    } else if (result.substring(result.length - 2, result.length) == 'سه') {
      return result.substring(0, result.length - 1) + 'وم';
    } else if (result.substring(result.length - 2, result.length) == 'سی') {
      return result + '‌ام';
    } else {
      return result + 'م';
    }
  }
}