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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 import 'package:barback/barback.dart'; |
| 6 import 'package:path/path.dart' as p; |
| 7 |
| 8 import 'dart:async'; |
| 9 |
| 10 class MakeBook extends AggregateTransformer { |
| 11 // All transformers need to implement "asPlugin" to let Pub know that they |
| 12 // are transformers. |
| 13 MakeBook.asPlugin(); |
| 14 |
| 15 // Implement the classifyPrimary method to claim any assets that you want |
| 16 // to handle. Return a value for the assets you want to handle, |
| 17 // or null for those that you do not want to handle. |
| 18 classifyPrimary(AssetId id) { |
| 19 // Only process assets where the filename ends with "recipe.html". |
| 20 if (!id.path.endsWith('recipe.html')) return null; |
| 21 |
| 22 // Return the path string, minus the recipe itself. |
| 23 // This is where the output asset will be written. |
| 24 return p.url.dirname(id.path); |
| 25 } |
| 26 |
| 27 // Implement the apply method to process the assets and create the |
| 28 // output asset. |
| 29 Future apply(AggregateTransform transform) { |
| 30 var buffer = new StringBuffer()..write('<html><body>'); |
| 31 |
| 32 return transform.primaryInputs.toList().then((assets) { |
| 33 // The order of [transform.primaryInputs] is not guaranteed |
| 34 // to be stable across multiple runs of the transformer. |
| 35 // Therefore, we alphabetically sort the assets by ID string. |
| 36 assets.sort((x, y) => x.id.compareTo(y.id)); |
| 37 return Future.wait(assets.map((asset) { |
| 38 return asset.readAsString().then((content) { |
| 39 buffer.write(content); |
| 40 buffer.write('<hr>'); |
| 41 }); |
| 42 })); |
| 43 }).then((_) { |
| 44 buffer.write('</body></html>'); |
| 45 // Write the output back to the same directory, |
| 46 // in a file named recipes.html. |
| 47 var id = new AssetId(transform.package, |
| 48 p.url.join(transform.key, ".recipes.html")); |
| 49 transform.addOutput(new Asset.fromString(id, buffer.toString())); |
| 50 }); |
| 51 } |
| 52 } |
| 53 |
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Chromium Code Reviews
Issue 429943004:
Adding an aggregate transformer example to barback. Also updating the previous examples. (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart