| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library barback.test.transformer.one_to_many; |
| |
| import 'dart:async'; |
| |
| import 'package:barback/barback.dart'; |
| |
| import 'mock.dart'; |
| |
| /// A [Transformer] that takes an input asset that contains a comma-separated |
| /// list of paths and outputs a file for each path. |
| class OneToManyTransformer extends MockTransformer { |
| final String extension; |
| |
| /// Creates a transformer that consumes assets with [extension]. |
| /// |
| /// That file contains a comma-separated list of paths and it will output |
| /// files at each of those paths. |
| OneToManyTransformer(this.extension); |
| |
| Future<bool> doIsPrimary(Asset asset) => |
| new Future.value(asset.id.extension == ".$extension"); |
| |
| Future doApply(Transform transform) { |
| return getPrimary(transform) |
| .then((input) => input.readAsString()) |
| .then((lines) { |
| for (var line in lines.split(",")) { |
| var id = new AssetId(transform.primaryId.package, line); |
| transform.addOutput(new Asset.fromString(id, "spread $extension")); |
| } |
| }); |
| } |
| |
| String toString() => "1->many $extension"; |
| } |