Move PubPackageMapProvider to its own file.

pkg/analyzer/lib/source/pub_package_map_provider.dart

 // 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 source.package_map_provider;
+library source.pub_package_map_provider;
 
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io' as io;
 
 import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/source/package_map_provider.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:path/path.dart';
 
 /**
- * Data structure output by PackageMapProvider.  This contains both the package
- * map and dependency information.
- */
-class PackageMapInfo {
-  /**
-   * The package map itself.  This is a map from package name to a list of
-   * the folders containing source code for the package.
-   *
-   * `null` if an error occurred.
-   */
-  Map<String, List<Folder>> packageMap;
-
-  /**
-   * Dependency information.  This is a set of the paths which were consulted
-   * in order to generate the package map.  If any of these files is
-   * modified, the package map will need to be regenerated.
-   */
-  Set<String> dependencies;
-
-  PackageMapInfo(this.packageMap, this.dependencies);
-}
-
-/**
- * A PackageMapProvider is an entity capable of determining the mapping from
- * package name to source directory for a given folder.
- */
-abstract class PackageMapProvider {
-  /**
-   * Compute a package map for the given folder, if possible.
-   *
-   * If a package map can't be computed (e.g. because an error occurred), a
-   * [PackageMapInfo] will still be returned, but its packageMap will be null.
-   */
-  PackageMapInfo computePackageMap(Folder folder);
-}
-
-/**
  * Implementation of PackageMapProvider that operates by executing pub.
  */
 class PubPackageMapProvider implements PackageMapProvider {
   static const String PUB_LIST_COMMAND = 'list-package-dirs';
 
   /**
    * The name of the 'pubspec.lock' file, which we assume is the dependency
    * in the event that [PUB_LIST_COMMAND] fails.
    */
   static const String PUBSPEC_LOCK_NAME = 'pubspec.lock';
@@ skipping 97 matching lines @@
    */
   PackageMapInfo _error(Folder folder) {
     // Even if an error occurs, we still need to know the dependencies, so that
     // we'll know when to try running "pub list-package-dirs" again.
     // Unfortunately, "pub list-package-dirs" doesn't tell us dependencies when
     // an error occurs, so just assume there is one dependency, "pubspec.lock".
     List<String> dependencies = <String>[join(folder.path, PUBSPEC_LOCK_NAME)];
     return new PackageMapInfo(null, dependencies.toSet());
   }
 }