Move pub into sdk/lib/_internal.

utils/pub/path_source.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 path_source;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:pathos/path.dart' as path;
-
-import 'log.dart' as log;
-
-import 'io.dart';
-import 'package.dart';
-import 'pubspec.dart';
-import 'version.dart';
-import 'source.dart';
-import 'utils.dart';
-
-// TODO(rnystrom): Support relative paths. (See comment in _validatePath().)
-/// A package [Source] that installs packages from a given local file path.
-class PathSource extends Source {
-  final name = 'path';
-  final shouldCache = false;
-
-  Future<Pubspec> describe(PackageId id) {
-    return new Future.sync(() {
-      _validatePath(id.name, id.description);
-      return new Pubspec.load(id.name, id.description["path"],
-          systemCache.sources);
-    });
-  }
-
-  bool descriptionsEqual(description1, description2) {
-    try {
-      // Compare real paths after normalizing and resolving symlinks.
-      var path1 = new File(description1["path"]).fullPathSync();
-      var path2 = new File(description2["path"]).fullPathSync();
-      return path1 == path2;
-    } on FileIOException catch (ex) {
-      // If either of the files couldn't be found, fall back to just comparing
-      // the normalized paths.
-      var path1 = path.normalize(path.absolute(description1["path"]));
-      var path2 = path.normalize(path.absolute(description2["path"]));
-      return path1 == path2;
-    }
-  }
-
-  Future<bool> install(PackageId id, String destination) {
-    return new Future.sync(() {
-      try {
-        _validatePath(id.name, id.description);
-      } on FormatException catch(err) {
-        return false;
-      }
-
-      createPackageSymlink(id.name, id.description["path"], destination,
-          relative: id.description["relative"]);
-      return true;
-    });
-  }
-
-  /// Parses a path dependency. This takes in a path string and returns a map.
-  /// The "path" key will be the original path but resolved relative to the
-  /// containing path. The "relative" key will be `true` if the original path
-  /// was relative.
-  ///
-  /// A path coming from a pubspec is a simple string. From a lock file, it's
-  /// an expanded {"path": ..., "relative": ...} map.
-  dynamic parseDescription(String containingPath, description,
-                           {bool fromLockFile: false}) {
-    if (fromLockFile) {
-      if (description is! Map) {
-        throw new FormatException("The description must be a map.");
-      }
-
-      if (description["path"] is! String) {
-        throw new FormatException("The 'path' field of the description must "
-            "be a string.");
-      }
-
-      if (description["relative"] is! bool) {
-        throw new FormatException("The 'relative' field of the description "
-            "must be a boolean.");
-      }
-
-      return description;
-    }
-
-    if (description is! String) {
-      throw new FormatException("The description must be a path string.");
-    }
-
-    // Resolve the path relative to the containing file path, and remember
-    // whether the original path was relative or absolute.
-    bool isRelative = path.isRelative(description);
-    if (path.isRelative(description)) {
-      // Can't handle relative paths coming from pubspecs that are not on the
-      // local file system.
-      assert(containingPath != null);
-
-      description = path.join(path.dirname(containingPath), description);
-    }
-
-    return {
-      "path": description,
-      "relative": isRelative
-    };
-  }
-
-  /// Ensures that [description] is a valid path description. It must be a map,
-  /// with a "path" key containing a path that points to an existing directory.
-  /// Throws a [FormatException] if the path is invalid.
-  void _validatePath(String name, description) {
-    var dir = description["path"];
-
-    if (dirExists(dir)) return;
-
-    if (fileExists(dir)) {
-      throw new FormatException(
-          "Path dependency for package '$name' must refer to a "
-          "directory, not a file. Was '$dir'.");
-    }
-
-    throw new FormatException("Could not find package '$name' at '$dir'.");
-  }
-}