| 1 | | | import '../typedefs.dart'; |
| 2 | | | import 'converter.dart'; |
| 3 | | | |
| 4 | | | final class NumConverter extends Converter { |
| 5 | | 12 | const NumConverter(); |
| 6 | | | |
| 7 | | | static const instance = NumConverter(); |
| 8 | | | |
| 9 | | 1 | @override |
| 10 | | | Cast<T> value<T extends Object>() { |
| 11 | | 1 | if (T == int) return _toInt as Cast<T>; |
| 12 | | 1 | if (T == double) return _toDbl as Cast<T>; |
| 13 | | | return Converter.identity<T>; |
| 14 | | | } |
| 15 | | | |
| 16 | | 1 | static int _toInt(dynamic x) { |
| 17 | | | x as num; |
| 18 | | 2 | if (x is int && x.isFinite) return x; |
| 19 | | 1 | double y = x.toDouble(); |
| 20 | | 1 | if (!y.isFinite) return double.nan as int; // intended type error |
| 21 | | 2 | final z = y.toInt(), d = y - z; |
| 22 | | 1 | if (d != 0) return double.nan as int; // intended type error |
| 23 | | | return z; |
| 24 | | | } |
| 25 | | | |
| 26 | | 2 | static double _toDbl(dynamic x) => (x as num).toDouble(); |
| 27 | | | } |