Refactor pkg/path.

pkg/scheduled_test/lib/src/descriptor/directory_descriptor.dart

 // 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 descriptor.directory;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
 
 import '../../descriptor.dart';
 import '../../scheduled_test.dart';
 import '../utils.dart';
 
-/// A path builder to ensure that [load] uses POSIX paths.
-final path.Builder _path = new path.Builder(style: path.Style.posix);
-
 /// A descriptor describing a directory containing multiple files.
 class DirectoryDescriptor extends Descriptor implements LoadableDescriptor {
   /// The entries contained within this directory. This is intentionally
   /// mutable.
   final List<Descriptor> contents;
 
   DirectoryDescriptor(String name, Iterable<Descriptor> contents)
       : super(name),
         contents = contents.toList();
 
@@ skipping 22 matching lines @@
           .catchError((e) => e);
     })).then((results) {
       var errors = results.where((e) => e != null);
       if (errors.isEmpty) return;
       throw _DirectoryValidationError.merge(errors);
     });
   }
 
   Stream<List<int>> load(String pathToLoad) {
     return futureStream(new Future.value().then((_) {
-      if (_path.isAbsolute(pathToLoad)) {
+      if (path.posix.isAbsolute(pathToLoad)) {
         throw new ArgumentError("Can't load absolute path '$pathToLoad'.");
       }
 
-      var split = _path.split(_path.normalize(pathToLoad));
+      var split = path.posix.split(path.posix.normalize(pathToLoad));
       if (split.isEmpty || split.first == '.' || split.first == '..') {
         throw new ArgumentError("Can't load '$pathToLoad' from within "
             "'$name'.");
       }
 
       var requiresReadable = split.length == 1;
       var matchingEntries = contents.where((entry) {
         return entry.name == split.first && (requiresReadable ?
             entry is ReadableDescriptor :
             entry is LoadableDescriptor);
       }).toList();
 
       var adjective = requiresReadable ? 'readable' : 'loadable';
       if (matchingEntries.length == 0) {
         fail("Couldn't find a $adjective entry named '${split.first}' within "
              "'$name'.");
       } else if (matchingEntries.length > 1) {
         fail("Found multiple $adjective entries named '${split.first}' within "
              "'$name'.");
       } else {
         var remainingPath = split.sublist(1);
         if (remainingPath.isEmpty) {
           return (matchingEntries.first as ReadableDescriptor).read();
         } else {
           return (matchingEntries.first as LoadableDescriptor)
-              .load(_path.joinAll(remainingPath));
+              .load(path.posix.joinAll(remainingPath));
         }
       }
     }));
   }
 
   String describe() {
     if (contents.isEmpty) return name;
 
     var buffer = new StringBuffer();
     buffer.writeln(name);
@@ skipping 25 matching lines @@
 
   _DirectoryValidationError(Iterable errors)
       : errors = errors.map((e) => e.toString()).toList();
 
   String toString() {
     if (errors.length == 1) return errors.single;
     return errors.map((e) => prefixLines(e, prefix: '  ', firstPrefix: '* '))
         .join('\n');
   }
 }