parse static method

Implementation

static List<ConditionKey> parse(String keys) {
  keys = keys.trim();
  if (keys.isEmpty) {
    throw ArgumentError('Empty key');
  }

  var list =
      _keyRegExp.allMatches(keys).map((m) {
        var s1 = m.group(1);
        if (s1 != null) {
          return ConditionKeyField(s1);
        }

        var s2 = m.group(2);
        if (s2 != null) {
          return ConditionKeyField(s2);
        }

        var field = m.group(3);
        if (field != null) {
          return ConditionKeyField(field);
        }

        var index = m.group(4);
        if (index != null) {
          var idx = int.parse(index);
          return ConditionKeyIndex(idx);
        }

        throw StateError('Invalid match: $m');
      }).toList();

  return list;
}