Rename BuildDirectory -> SourceDirectory.

sdk/lib/_internal/pub/lib/src/barback/build_environment.dart

Index: sdk/lib/_internal/pub/lib/src/barback/build_environment.dart
diff --git a/sdk/lib/_internal/pub/lib/src/barback/build_environment.dart b/sdk/lib/_internal/pub/lib/src/barback/build_environment.dart
deleted file mode 100644
index a332dd5e121a386a99911d1294ddab7ab8b5b510..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/barback/build_environment.dart
+++ /dev/null
@@ -1,733 +0,0 @@
-// Copyright (c) 2014, 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 pub.barback.build_environment;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:barback/barback.dart';
-import 'package:path/path.dart' as path;
-import 'package:stack_trace/stack_trace.dart';
-import 'package:watcher/watcher.dart';
-
-import '../entrypoint.dart';
-import '../io.dart';
-import '../log.dart' as log;
-import '../package.dart';
-import '../package_graph.dart';
-import '../sdk.dart' as sdk;
-import 'admin_server.dart';
-import 'build_directory.dart';
-import 'dart_forwarding_transformer.dart';
-import 'dart2js_transformer.dart';
-import 'load_all_transformers.dart';
-import 'pub_package_provider.dart';
-import 'barback_server.dart';
-
-/// The entire "visible" state of the assets of a package and all of its
-/// dependencies, taking into account the user's configuration when running pub.
-///
-/// Where [PackageGraph] just describes the entrypoint's dependencies as
-/// specified by pubspecs, this includes "transient" information like the mode
-/// that the user is running pub in, or which directories they want to build.
-class BuildEnvironment {
-  /// Creates a new build environment for working with the assets used by
-  /// [entrypoint] and its dependencies.
-  ///
-  /// Spawns an HTTP server for each directory in [rootDirectories]. These
-  /// servers will be on [hostname] and have ports based on [basePort].
-  /// [basePort] itself is reserved for "web/" and `basePort + 1` is reserved
-  /// for "test/"; further ports will be allocated for other root directories as
-  /// necessary. If [basePort] is zero, each server will have an ephemeral port.
-  ///
-  /// Loads all used transformers using [mode] (including dart2js if
-  /// [useDart2JS] is true).
-  ///
-  /// Includes [rootDirectories] in the root package, as well as "lib" and
-  /// "asset".
-  ///
-  /// If [watcherType] is not [WatcherType.NONE], watches source assets for
-  /// modification.
-  ///
-  /// Returns a [Future] that completes to the environment once the inputs,
-  /// transformers, and server are loaded and ready.
-  static Future<BuildEnvironment> create(Entrypoint entrypoint,
-      String hostname, int basePort, BarbackMode mode, WatcherType watcherType,
-      {bool useDart2JS: true}) {
-    return entrypoint.loadPackageGraph().then((graph) {
-      log.fine("Loaded package graph.");
-      var barback = new Barback(new PubPackageProvider(graph));
-      barback.log.listen(_log);
-
-      var environment = new BuildEnvironment._(graph, barback, mode,
-          watcherType, hostname, basePort);
-
-      return environment._load(useDart2JS: useDart2JS)
-          .then((_) => environment);
-    });
-  }
-
-  /// The server for the Web Socket API and admin interface.
-  AdminServer _adminServer;
-
-  /// The public directories in the root package that are available for
-  /// building, keyed by their root directory.
-  final _directories = new Map<String, BuildDirectory>();
-
-  /// The [Barback] instance used to process assets in this environment.
-  final Barback barback;
-
-  /// The root package being built.
-  Package get rootPackage => graph.entrypoint.root;
-
-  /// The underlying [PackageGraph] being built.
-  final PackageGraph graph;
-
-  /// The mode to run the transformers in.
-  final BarbackMode mode;
-
-  /// The [Transformer]s that should be appended by default to the root
-  /// package's transformer cascade. Will be empty if there are none.
-  final _builtInTransformers = <Transformer>[];
-
-  /// How source files should be watched.
-  final WatcherType _watcherType;
-
-  /// The hostname that servers are bound to.
-  final String _hostname;
-
-  /// The starting number for ports that servers will be bound to.
-  ///
-  /// Servers will be bound to ports starting at this number and then
-  /// incrementing from there. However, if this is zero, then ephemeral port
-  /// numbers will be selected for each server.
-  final int _basePort;
-
-  /// The modified source assets that have not been sent to barback yet.
-  ///
-  /// The build environment can be paused (by calling [pauseUpdates]) and
-  /// resumed ([resumeUpdates]). While paused, all source asset updates that
-  /// come from watching or adding new directories are not sent to barback.
-  /// When resumed, all pending source updates are sent to barback.
-  ///
-  /// This lets pub serve and pub build create an environment and bind several
-  /// servers before barback starts building and producing results
-  /// asynchronously.
-  ///
-  /// If this is `null`, then the environment is "live" and all updates will
-  /// go to barback immediately.
-  Set<AssetId> _modifiedSources;
-
-  BuildEnvironment._(this.graph, this.barback, this.mode, this._watcherType,
-      this._hostname, this._basePort);
-
-  /// Gets the built-in [Transformer]s that should be added to [package].
-  ///
-  /// Returns `null` if there are none.
-  Iterable<Transformer> getBuiltInTransformers(Package package) {
-    // Built-in transformers only apply to the root package.
-    if (package.name != rootPackage.name) return null;
-
-    // The built-in transformers are for dart2js and forwarding assets around
-    // dart2js.
-    if (_builtInTransformers.isEmpty) return null;
-
-    return _builtInTransformers;
-  }
-
-  /// Starts up the admin server on an appropriate port and returns it.
-  ///
-  /// This may only be called once on the build environment.
-  Future<AdminServer> startAdminServer([int port]) {
-    // Can only start once.
-    assert(_adminServer == null);
-
-    // The admin server is bound to one before the base port by default, unless
-    // it's ephemeral in which case the admin port is too.
-    if (port == null) port = _basePort == 0 ? 0 : _basePort - 1;
-
-    return AdminServer.bind(this, _hostname, port)
-        .then((server) => _adminServer = server);
-  }
-
-  /// Binds a new port to serve assets from within [rootDirectory] in the
-  /// entrypoint package.
-  ///
-  /// Adds and watches the sources within that directory. Returns a [Future]
-  /// that completes to the bound server.
-  ///
-  /// If [rootDirectory] is already being served, returns that existing server.
-  Future<BarbackServer> serveDirectory(String rootDirectory) {
-    // See if there is already a server bound to the directory.
-    var directory = _directories[rootDirectory];
-    if (directory != null) {
-      return directory.server.then((server) {
-        log.fine('Already serving $rootDirectory on ${server.url}.');
-        return server;
-      });
-    }
-
-    // See if the new directory overlaps any existing servers.
-    var overlapping = _directories.keys.where((directory) =>
-        path.isWithin(directory, rootDirectory) ||
-        path.isWithin(rootDirectory, directory)).toList();
-
-    if (overlapping.isNotEmpty) {
-      return new Future.error(
-          new OverlappingSourceDirectoryException(overlapping));
-    }
-
-    var port = _basePort;
-
-    // If not using an ephemeral port, find the lowest-numbered available one.
-    if (port != 0) {
-      var boundPorts = _directories.values.map((directory) => directory.port)
-          .toSet();
-      while (boundPorts.contains(port)) {
-        port++;
-      }
-    }
-
-    var buildDirectory = new BuildDirectory(
-        this, rootDirectory, _hostname, port);
-    _directories[rootDirectory] = buildDirectory;
-
-    return _provideDirectorySources(rootPackage, rootDirectory)
-        .then((subscription) {
-      buildDirectory.watchSubscription = subscription;
-      return buildDirectory.serve();
-    });
-  }
-
-  /// Stops the server bound to [rootDirectory].
-  ///
-  /// Also removes any source files within that directory from barback. Returns
-  /// the URL of the unbound server, of `null` if [rootDirectory] was not
-  /// bound to a server.
-  Future<Uri> unserveDirectory(String rootDirectory) {
-    log.fine("Unserving $rootDirectory.");
-    var directory = _directories.remove(rootDirectory);
-    if (directory == null) return new Future.value();
-
-    return directory.server.then((server) {
-      var url = server.url;
-      return directory.close().then((_) {
-        // Remove the sources from barback, unless some other build directory
-        // includes them.
-        return _removeDirectorySources(rootDirectory);
-      }).then((_) => url);
-    });
-  }
-
-  /// Gets the build directory that contains [assetPath] within the entrypoint
-  /// package.
-  ///
-  /// If [assetPath] is not contained within a build directory, this will
-  /// throw an exception.
-  String getBuildDirectoryContaining(String assetPath) =>
-      _directories.values
-          .firstWhere((dir) => path.isWithin(dir.directory, assetPath))
-          .directory;
-
-  /// Return all URLs serving [assetPath] in this environment.
-  Future<List<Uri>> getUrlsForAssetPath(String assetPath) {
-    // Check the three (mutually-exclusive) places the path could be pointing.
-    return _lookUpPathInServerRoot(assetPath).then((urls) {
-      if (urls.isNotEmpty) return urls;
-      return _lookUpPathInPackagesDirectory(assetPath);
-    }).then((urls) {
-      if (urls.isNotEmpty) return urls;
-      return _lookUpPathInDependency(assetPath);
-    });
-  }
-
-  /// Look up [assetPath] in the root directories of servers running in the
-  /// entrypoint package.
-  Future<List<Uri>> _lookUpPathInServerRoot(String assetPath) {
-    // Find all of the servers whose root directories contain the asset and
-    // generate appropriate URLs for each.
-    return Future.wait(_directories.values
-        .where((dir) => path.isWithin(dir.directory, assetPath))
-        .map((dir) {
-      var relativePath = path.relative(assetPath, from: dir.directory);
-      return dir.server.then((server) =>
-          server.url.resolveUri(path.toUri(relativePath)));
-    }));
-  }
-
-  /// Look up [assetPath] in the "packages" directory in the entrypoint package.
-  Future<List<Uri>> _lookUpPathInPackagesDirectory(String assetPath) {
-    var components = path.split(path.relative(assetPath));
-    if (components.first != "packages") return new Future.value([]);
-    if (!graph.packages.containsKey(components[1])) return new Future.value([]);
-    return Future.wait(_directories.values.map((dir) {
-      return dir.server.then((server) =>
-          server.url.resolveUri(path.toUri(assetPath)));
-    }));
-  }
-
-  /// Look up [assetPath] in the "lib" or "asset" directory of a dependency
-  /// package.
-  Future<List<Uri>> _lookUpPathInDependency(String assetPath) {
-    for (var package in graph.packages.values) {
-      var libDir = path.join(package.dir, 'lib');
-      var assetDir = path.join(package.dir, 'asset');
-
-      var uri;
-      if (path.isWithin(libDir, assetPath)) {
-        uri = path.toUri(path.join('packages', package.name,
-            path.relative(assetPath, from: libDir)));
-      } else if (path.isWithin(assetDir, assetPath)) {
-        uri = path.toUri(path.join('assets', package.name,
-            path.relative(assetPath, from: assetDir)));
-      } else {
-        continue;
-      }
-
-      return Future.wait(_directories.values.map((dir) {
-        return dir.server.then((server) => server.url.resolveUri(uri));
-      }));
-    }
-
-    return new Future.value([]);
-  }
-
-  /// Given a URL to an asset served by this environment, returns the ID of the
-  /// asset that would be accessed by that URL.
-  ///
-  /// If no server can serve [url], completes to `null`.
-  Future<AssetId> getAssetIdForUrl(Uri url) {
-    return Future.wait(_directories.values.map((dir) => dir.server))
-        .then((servers) {
-      var server = servers.firstWhere(
-          (server) => server.address.host == url.host &&
-              server.port == url.port,
-          orElse: () => null);
-      if (server == null) return null;
-      return server.urlToId(url);
-    });
-  }
-
-  /// Determines if [sourcePath] is contained within any of the directories in
-  /// the root package that are visible to this build environment.
-  bool containsPath(String sourcePath) {
-    var directories = ["asset", "lib"];
-    directories.addAll(_directories.keys);
-
-    return directories.any((dir) => path.isWithin(dir, sourcePath));
-  }
-
-  /// Pauses sending source asset updates to barback.
-  void pauseUpdates() {
-    // Cannot pause while already paused.
-    assert(_modifiedSources == null);
-
-    _modifiedSources = new Set<AssetId>();
-  }
-
-  /// Sends any pending source updates to barback and begins the asynchronous
-  /// build process.
-  void resumeUpdates() {
-    // Cannot resume while not paused.
-    assert(_modifiedSources != null);
-
-    barback.updateSources(_modifiedSources);
-    _modifiedSources = null;
-  }
-
-  /// Loads the assets and transformers for this environment.
-  ///
-  /// This transforms and serves all library and asset files in all packages in
-  /// the environment's package graph. It loads any transformer plugins defined
-  /// in packages in [graph] and re-runs them as necessary when any input files
-  /// change.
-  ///
-  /// If [useDart2JS] is `true`, then the [Dart2JSTransformer] is implicitly
-  /// added to end of the root package's transformer phases.
-  ///
-  /// Returns a [Future] that completes once all inputs and transformers are
-  /// loaded.
-  Future _load({bool useDart2JS}) {
-    // If the entrypoint package manually configures the dart2js
-    // transformer, don't include it in the built-in transformer list.
-    //
-    // TODO(nweiz): if/when we support more built-in transformers, make
-    // this more general.
-    var containsDart2JS = graph.entrypoint.root.pubspec.transformers
-        .any((transformers) => transformers
-        .any((id) => id.package == '\$dart2js'));
-
-    if (!containsDart2JS && useDart2JS) {
-      _builtInTransformers.addAll([
-        new Dart2JSTransformer(this, mode),
-        new DartForwardingTransformer(mode)
-      ]);
-    }
-
-    // "$pub" is a psuedo-package that allows pub's transformer-loading
-    // infrastructure to share code with pub proper. We provide it only during
-    // the initial transformer loading process.
-    var dartPath = assetPath('dart');
-    var pubSources = listDir(dartPath, recursive: true).map((library) {
-      return new AssetId('\$pub',
-          path.join('lib', path.relative(library, from: dartPath)));
-    });
-
-    // "$sdk" is a pseudo-package that allows the dart2js transformer to find
-    // the Dart core libraries without hitting the file system directly. This
-    // ensures they work with source maps.
-    var libPath = path.join(sdk.rootDirectory, "lib");
-    var sdkSources = listDir(libPath, recursive: true)
-        .where((file) => path.extension(file) == ".dart")
-        .map((file) => new AssetId('\$sdk',
-            path.join("lib", path.relative(file, from: sdk.rootDirectory))));
-
-    // Bind a server that we can use to load the transformers.
-    var transformerServer;
-    return BarbackServer.bind(this, _hostname, 0, null).then((server) {
-      transformerServer = server;
-
-      return log.progress("Loading source assets", () {
-        barback.updateSources(pubSources);
-        barback.updateSources(sdkSources);
-        return _provideSources();
-      });
-    }).then((_) {
-      log.fine("Provided sources.");
-      var completer = new Completer();
-
-      // If any errors get emitted either by barback or by the transformer
-      // server, including non-programmatic barback errors, they should take
-      // down the whole program.
-      var subscriptions = [
-        barback.errors.listen((error) {
-          if (error is TransformerException) {
-            var message = error.error.toString();
-            if (error.stackTrace != null) {
-              message += "\n" + error.stackTrace.terse.toString();
-            }
-
-            _log(new LogEntry(error.transform, error.transform.primaryId,
-                LogLevel.ERROR, message, null));
-          } else if (!completer.isCompleted) {
-            completer.completeError(error, new Chain.current());
-          }
-        }),
-        barback.results.listen((_) {},
-            onError: (error, stackTrace) {
-          if (completer.isCompleted) return;
-          completer.completeError(error, stackTrace);
-        }),
-        transformerServer.results.listen((_) {}, onError: (error, stackTrace) {
-          if (completer.isCompleted) return;
-          completer.completeError(error, stackTrace);
-        })
-      ];
-
-      loadAllTransformers(this, transformerServer).then((_) {
-        log.fine("Loaded transformers.");
-        return transformerServer.close();
-      }).then((_) {
-        if (!completer.isCompleted) completer.complete();
-      }).catchError((error, stackTrace) {
-        if (!completer.isCompleted) {
-          completer.completeError(error, stackTrace);
-        }
-      });
-
-      return completer.future.whenComplete(() {
-        for (var subscription in subscriptions) {
-          subscription.cancel();
-        }
-      });
-    }).then((_) => barback.removeSources(pubSources));
-  }
-
-  /// Provides the public source assets in the environment to barback.
-  ///
-  /// If [watcherType] is not [WatcherType.NONE], enables watching on them.
-  Future _provideSources() {
-    return Future.wait(graph.packages.values.map((package) {
-      // Just include the "shared" directories in each package. We'll add the
-      // other build directories in the root package by calling
-      // [serveDirectory].
-      return Future.wait([
-        _provideDirectorySources(package, "asset"),
-        _provideDirectorySources(package, "lib")
-      ]);
-    }));
-  }
-
-  /// Provides all of the source assets within [dir] in [package] to barback.
-  ///
-  /// If [watcherType] is not [WatcherType.NONE], enables watching on them.
-  /// Returns the subscription to the watcher, or `null` if none was created.
-  Future<StreamSubscription<WatchEvent>> _provideDirectorySources(
-      Package package, String dir) {
-    log.fine("Providing sources for ${package.name}|$dir.");
-    // TODO(rnystrom): Handle overlapping directories. If two served
-    // directories overlap like so:
-    //
-    // $ pub serve example example/subdir
-    //
-    // Then the sources of the subdirectory will be updated and watched twice.
-    // See: #17454
-    if (_watcherType == WatcherType.NONE) {
-      return _updateDirectorySources(package, dir);
-    }
-
-    // Watch the directory before listing is so we don't miss files that
-    // are added between the initial list and registering the watcher.
-    return _watchDirectorySources(package, dir).then((_) {
-      return _updateDirectorySources(package, dir);
-    });
-  }
-
-  /// Updates barback with all of the files in [dir] inside [package].
-  Future _updateDirectorySources(Package package, String dir) {
-    return _listDirectorySources(package, dir).then((ids) {
-      if (_modifiedSources == null) {
-        barback.updateSources(ids);
-      } else {
-        _modifiedSources.addAll(ids);
-      }
-    });
-  }
-
-  /// Removes all of the files in [dir] in the root package from barback unless
-  /// some other build directory still contains them.
-  Future _removeDirectorySources(String dir) {
-    return _listDirectorySources(rootPackage, dir, where: (relative) {
-      // TODO(rnystrom): This is O(n*m) where n is the number of files and
-      // m is the number of served directories. Consider something more
-      // optimal if this becomes a bottleneck.
-      // Don't remove a source if some other directory still includes it.
-      return !_directories.keys.any((dir) => path.isWithin(dir, relative));
-    }).then((ids) {
-      if (_modifiedSources == null) {
-        barback.removeSources(ids);
-      } else {
-        _modifiedSources.removeAll(ids);
-      }
-    });
-  }
-
-  /// Lists all of the source assets in [dir] inside [package].
-  ///
-  /// For large packages, listing the contents is a performance bottleneck, so
-  /// this is optimized for our needs in here instead of using the more general
-  /// but slower [listDir].
-  ///
-  /// If [where] is given, then it is used to filter the resulting list of
-  /// packages. Only assets whose relative path within [package] matches that
-  /// will be included in the results.
-  Future<List<AssetId>> _listDirectorySources(Package package, String dir,
-      {bool where(String relativePath)}) {
-    var subdirectory = path.join(package.dir, dir);
-    if (!dirExists(subdirectory)) return new Future.value([]);
-
-    return new Directory(subdirectory).list(recursive: true, followLinks: true)
-        .expand((entry) {
-      // Skip directories and (broken) symlinks.
-      if (entry is Directory) return [];
-      if (entry is Link) return [];
-
-      var relative = path.normalize(
-          path.relative(entry.path, from: package.dir));
-
-      // Ignore hidden files or files in "packages" and hidden directories.
-      if (path.split(relative).any((part) =>
-          part.startsWith(".") || part == "packages")) {
-        return [];
-      }
-
-      // Skip files that were (most likely) compiled from nearby ".dart"
-      // files. These are created by the Editor's "Run as JavaScript"
-      // command and are written directly into the package's directory.
-      // When pub's dart2js transformer then tries to create the same file
-      // name, we get a build error. To avoid that, just don't consider
-      // that file to be a source.
-      // TODO(rnystrom): Remove these when the Editor no longer generates
-      // .js files and users have had enough time that they no longer have
-      // these files laying around. See #15859.
-      if (relative.endsWith(".dart.js")) return [];
-      if (relative.endsWith(".dart.js.map")) return [];
-      if (relative.endsWith(".dart.precompiled.js")) return [];
-
-      if (where != null && !where(relative)) return [];
-
-      return [new AssetId(package.name, relative)];
-    }).toList();
-  }
-
-  /// Adds a file watcher for [dir] within [package], if the directory exists
-  /// and the package needs watching.
-  Future<StreamSubscription<WatchEvent>> _watchDirectorySources(
-      Package package, String dir) {
-    // If this package comes from a cached source, its contents won't change so
-    // we don't need to monitor it. `packageId` will be null for the
-    // application package, since that's not locked.
-    var packageId = graph.lockFile.packages[package.name];
-    if (packageId != null &&
-        graph.entrypoint.cache.sources[packageId.source].shouldCache) {
-      return new Future.value();
-    }
-
-    var subdirectory = path.join(package.dir, dir);
-    if (!dirExists(subdirectory)) return new Future.value();
-
-    // TODO(nweiz): close this watcher when [barback] is closed.
-    var watcher = _watcherType.create(subdirectory);
-    var subscription = watcher.events.listen((event) {
-      // Don't watch files symlinked into these directories.
-      // TODO(rnystrom): If pub gets rid of symlinks, remove this.
-      var parts = path.split(event.path);
-      if (parts.contains("packages") || parts.contains("assets")) return;
-
-      // Skip files that were (most likely) compiled from nearby ".dart"
-      // files. These are created by the Editor's "Run as JavaScript"
-      // command and are written directly into the package's directory.
-      // When pub's dart2js transformer then tries to create the same file
-      // name, we get a build error. To avoid that, just don't consider
-      // that file to be a source.
-      // TODO(rnystrom): Remove these when the Editor no longer generates
-      // .js files and users have had enough time that they no longer have
-      // these files laying around. See #15859.
-      if (event.path.endsWith(".dart.js")) return;
-      if (event.path.endsWith(".dart.js.map")) return;
-      if (event.path.endsWith(".dart.precompiled.js")) return;
-
-      var id = new AssetId(package.name,
-          path.relative(event.path, from: package.dir));
-      if (event.type == ChangeType.REMOVE) {
-        if (_modifiedSources != null) {
-          _modifiedSources.remove(id);
-        } else {
-          barback.removeSources([id]);
-        }
-      } else if (_modifiedSources != null) {
-        _modifiedSources.add(id);
-      } else {
-        barback.updateSources([id]);
-      }
-    });
-
-    return watcher.ready.then((_) => subscription);
-  }
-}
-
-/// Log [entry] using Pub's logging infrastructure.
-///
-/// Since both [LogEntry] objects and the message itself often redundantly
-/// show the same context like the file where an error occurred, this tries
-/// to avoid showing redundant data in the entry.
-void _log(LogEntry entry) {
-  messageMentions(text) =>
-      entry.message.toLowerCase().contains(text.toLowerCase());
-
-  messageMentionsAsset(id) =>
-      messageMentions(id.toString()) ||
-      messageMentions(path.fromUri(entry.assetId.path));
-
-  var prefixParts = [];
-
-  // Show the level (unless the message mentions it).
-  if (!messageMentions(entry.level.name)) {
-    prefixParts.add("${entry.level} from");
-  }
-
-  // Show the transformer.
-  prefixParts.add(entry.transform.transformer);
-
-  // Mention the primary input of the transform unless the message seems to.
-  if (!messageMentionsAsset(entry.transform.primaryId)) {
-    prefixParts.add("on ${entry.transform.primaryId}");
-  }
-
-  // If the relevant asset isn't the primary input, mention it unless the
-  // message already does.
-  if (entry.assetId != entry.transform.primaryId &&
-      !messageMentionsAsset(entry.assetId)) {
-    prefixParts.add("with input ${entry.assetId}");
-  }
-
-  var prefix = "[${prefixParts.join(' ')}]:";
-  var message = entry.message;
-  if (entry.span != null) {
-    message = entry.span.getLocationMessage(entry.message);
-  }
-
-  switch (entry.level) {
-    case LogLevel.ERROR:
-      log.error("${log.red(prefix)}\n$message");
-      break;
-
-    case LogLevel.WARNING:
-      log.warning("${log.yellow(prefix)}\n$message");
-      break;
-
-    case LogLevel.INFO:
-      log.message("${log.cyan(prefix)}\n$message");
-      break;
-
-    case LogLevel.FINE:
-      log.fine("${log.gray(prefix)}\n$message");
-      break;
-  }
-}
-
-/// Exception thrown when trying to serve a new directory that overlaps one or
-/// more directories already being served.
-class OverlappingSourceDirectoryException implements Exception {
-  /// The relative paths of the directories that overlap the one that could not
-  /// be served.
-  final List<String> overlappingDirectories;
-
-  OverlappingSourceDirectoryException(this.overlappingDirectories);
-}
-
-/// An enum describing different modes of constructing a [DirectoryWatcher].
-abstract class WatcherType {
-  /// A watcher that automatically chooses its type based on the operating
-  /// system.
-  static const AUTO = const _AutoWatcherType();
-
-  /// A watcher that always polls the filesystem for changes.
-  static const POLLING = const _PollingWatcherType();
-
-  /// No directory watcher at all.
-  static const NONE = const _NoneWatcherType();
-
-  /// Creates a new DirectoryWatcher.
-  DirectoryWatcher create(String directory);
-
-  String toString();
-}
-
-class _AutoWatcherType implements WatcherType {
-  const _AutoWatcherType();
-
-  DirectoryWatcher create(String directory) =>
-    new DirectoryWatcher(directory);
-
-  String toString() => "auto";
-}
-
-class _PollingWatcherType implements WatcherType {
-  const _PollingWatcherType();
-
-  DirectoryWatcher create(String directory) =>
-    new PollingDirectoryWatcher(directory);
-
-  String toString() => "polling";
-}
-
-class _NoneWatcherType implements WatcherType {
-  const _NoneWatcherType();
-
-  DirectoryWatcher create(String directory) => null;
-
-  String toString() => "none";
-}