sdk/lib/_internal/pub/test/serve/supports_user_defined_declaring_transformers.dart

// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;

import '../descriptor.dart' as d;
import '../test_pub.dart';
import 'utils.dart';

const LAZY_TRANSFORMER = """
import 'dart:async';

import 'package:barback/barback.dart';

class LazyRewriteTransformer extends Transformer implements LazyTransformer {
  LazyRewriteTransformer.asPlugin();

  String get allowedExtensions => '.in';

  Future apply(Transform transform) {
    transform.logger.info('Rewriting \${transform.primaryInput.id}.');
    return transform.primaryInput.readAsString().then((contents) {
      var id = transform.primaryInput.id.changeExtension(".mid");
      transform.addOutput(new Asset.fromString(id, "\$contents.mid"));
    });
  }

  Future declareOutputs(DeclaringTransform transform) {
    transform.declareOutput(transform.primaryId.changeExtension(".mid"));
    return new Future.value();
  }
}
""";

const DECLARING_TRANSFORMER = """
import 'dart:async';

import 'package:barback/barback.dart';

class DeclaringRewriteTransformer extends Transformer
    implements DeclaringTransformer {
  DeclaringRewriteTransformer.asPlugin();

  String get allowedExtensions => '.mid';

  Future apply(Transform transform) {
    transform.logger.info('Rewriting \${transform.primaryInput.id}.');
    return transform.primaryInput.readAsString().then((contents) {
      var id = transform.primaryInput.id.changeExtension(".final");
      transform.addOutput(new Asset.fromString(id, "\$contents.final"));
    });
  }

  Future declareOutputs(DeclaringTransform transform) {
    transform.declareOutput(transform.primaryId.changeExtension(".final"));
    return new Future.value();
  }
}
""";

main() {
  initConfig();
  integration("supports a user-defined declaring transformer", () {
    d.dir(appPath, [
      d.pubspec({
        "name": "myapp",
        "transformers": ["myapp/src/lazy", "myapp/src/declaring"]
      }),
      d.dir("lib", [d.dir("src", [
        // Include a lazy transformer before the declaring transformer, because
        // otherwise its behavior is indistinguishable from a normal
        // transformer.
        d.file("lazy.dart", LAZY_TRANSFORMER),
        d.file("declaring.dart", DECLARING_TRANSFORMER)
      ])]),
      d.dir("web", [
        d.file("foo.in", "foo")
      ])
    ]).create();

    createLockFile('myapp', pkg: ['barback']);

    var server = pubServe();
    // The build should complete without either transformer logging anything.
    server.stdout.expect('Build completed successfully');

    requestShouldSucceed("foo.final", "foo.mid.final");
    server.stdout.expect(emitsLines(
        '[Info from LazyRewrite]:\n'
        'Rewriting myapp|web/foo.in.\n'
        '[Info from DeclaringRewrite]:\n'
        'Rewriting myapp|web/foo.mid.'));
    endPubServe();
  });
}