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August 11, 2018 16:40
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| library petitparser.core.actions.action; | |
| import 'package:dart_server_test/src/core/combinators/delegate.dart'; | |
| import 'package:dart_server_test/src/core/contexts/context.dart'; | |
| import 'package:dart_server_test/src/core/contexts/result.dart'; | |
| import 'package:dart_server_test/src/core/parser.dart'; | |
| /// Typed action callback. | |
| typedef R ActionCallback<T, R>(T value); | |
| /// A parser that performs a transformation with a given function on the | |
| /// successful parse result of the delegate. | |
| class ActionParser<T, R> extends DelegateParser<R> { | |
| final ActionCallback<T, R> callback; | |
| ActionParser(Parser<T> delegate, this.callback) : super(delegate); | |
| @override | |
| Result<R> parseOn(Context context) { | |
| Result<T> result = delegate.parseOn(context); | |
| if (result.isSuccess) { | |
| return result.success(callback(result.value)); | |
| } else { | |
| return result.failure(result.message); | |
| } | |
| } | |
| @override | |
| ActionParser<T, R> copy() => ActionParser<T, R>(delegate, callback); | |
| @override | |
| bool hasEqualProperties(ActionParser<T, R> other) => | |
| super.hasEqualProperties(other) && callback == other.callback; | |
| } |
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