parse method

@override num parse(String input)

Parses input and returns the numeric value.

Throws FormatException when input cannot be parsed by this codec.

Implementation

@override
num parse(String input) {
  var text = input.trim();
  if (text.isEmpty) {
    throw FormatException('Expected an RMB uppercase amount.', input);
  }

  final negative = text.startsWith('负');
  if (negative) {
    text = text.substring(1);
    if (text.isEmpty) {
      throw FormatException('Expected an RMB uppercase amount.', input);
    }
  }

  if (prefix.isNotEmpty && text.startsWith(prefix)) {
    text = text.substring(prefix.length);
  }

  if (text.endsWith(wholeSuffix)) {
    text = text.substring(0, text.length - wholeSuffix.length);
  } else if (text.endsWith('正')) {
    text = text.substring(0, text.length - 1);
  }

  if (text.isEmpty) {
    throw FormatException('Expected an RMB uppercase amount.', input);
  }

  var yuan = 0;
  var lower = text;
  final yuanIndex = text.indexOf('元');
  if (yuanIndex >= 0) {
    final yuanText = text.substring(0, yuanIndex);
    if (yuanText.isEmpty) {
      throw FormatException('Expected an RMB amount yuan value.', input);
    }
    yuan = _financial.parse(yuanText);
    lower = text.substring(yuanIndex + 1);
  }

  if (lower.contains('角') || lower.contains('分')) {
    lower = lower.replaceFirst(_leadingZeroPattern, '');
  } else if (lower.trim().isNotEmpty) {
    throw FormatException('Unexpected RMB amount token.', input);
  }

  var jiao = 0;
  var fen = 0;

  final jiaoIndex = lower.indexOf('角');
  if (jiaoIndex >= 0) {
    final jiaoText = lower.substring(0, jiaoIndex);
    jiao = _parseSingleDigit(jiaoText, input);
    lower = lower.substring(jiaoIndex + 1);
  }

  final fenIndex = lower.indexOf('分');
  if (fenIndex >= 0) {
    final fenText = lower.substring(0, fenIndex);
    fen = _parseSingleDigit(fenText, input);
    lower = lower.substring(fenIndex + 1);
  }

  if (lower.trim().isNotEmpty) {
    throw FormatException('Unexpected RMB amount token.', input);
  }

  final cents = yuan * 100 + jiao * 10 + fen;
  final value = cents % 100 == 0 ? cents ~/ 100 : cents / 100;
  return negative ? -value : value;
}