Fix docgen Uri handling so it works on Windows.

pkg/docgen/lib/docgen.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.
 
 /// **docgen** is a tool for creating machine readable representations of Dart
 /// code metadata, including: classes, members, comments and annotations.
 ///
 /// docgen is run on a `.dart` file or a directory containing `.dart` files.
 ///
 ///      $ dart docgen.dart [OPTIONS] [FILE/DIR]
@@ skipping 110 matching lines @@
       if (mirrorSystem.libraries.isEmpty) {
         throw new StateError('No library mirrors were created.');
       }
       var availableLibraries = mirrorSystem.libraries.values.where(
           (each) => each.uri.scheme == 'file');
       _sdkLibraries = mirrorSystem.libraries.values.where(
           (each) => each.uri.scheme == 'dart');
       _coreLibrary = _sdkLibraries.singleWhere((lib) =>
           lib.uri.toString().startsWith('dart:core'));
       var availableLibrariesByPath = new Map.fromIterables(
-          availableLibraries.map((each) => each.uri.toFilePath()),
+          availableLibraries.map((each) => each.uri),
           availableLibraries);
       var librariesToDocument = requestedLibraries.map(
           (each) => availableLibrariesByPath.putIfAbsent(each,
               () => throw "Missing library $each")).toList();
       librariesToDocument.addAll((includeSdk || parseSdk) ? _sdkLibraries : []);
       librariesToDocument.removeWhere((x) => _excluded.contains(x.simpleName));
       _documentLibraries(librariesToDocument, includeSdk: includeSdk,
           outputToYaml: outputToYaml, append: append, parseSdk: parseSdk,
           introduction: introduction);
       return true;
@@ skipping 40 matching lines @@
   // If there are multiples, pick the shortest name.
   readmes.sort((a, b) => a.length.compareTo(b.length));
   var readme = readmes.first;
   var linkResolver = (name) => fixReference(name, null, null, null);
   var contents = markdown.markdownToHtml(readme
     .readAsStringSync(), linkResolver: linkResolver,
     inlineSyntaxes: markdownSyntaxes);
   return contents;
 }
 
-List<String> _listLibraries(List<String> args) {
-  var libraries = new List<String>();
+List<Uri> _listLibraries(List<String> args) {
+  var libraries = new List<Uri>();
   for (var arg in args) {
     var type = FileSystemEntity.typeSync(arg);
 
     if (type == FileSystemEntityType.FILE) {
       if (arg.endsWith('.dart')) {
-        libraries.add(path.absolute(arg));
+        libraries.add(new Uri.file(path.absolute(arg)));
         logger.info('Added to libraries: ${libraries.last}');
       }
     } else {
       libraries.addAll(_listDartFromDir(arg));
     }
   }
   return libraries;
 }
 
-List<String> _listDartFromDir(String args) {
+List<Uri> _listDartFromDir(String args) {
   var libraries = [];
   // To avoid anaylzing package files twice, only files with paths not
   // containing '/packages' will be added. The only exception is if the file to
   // analyze already has a '/package' in its path.
   var files = listDir(args, recursive: true).where((f) => f.endsWith('.dart') &&
       (!f.contains('${path.separator}packages') ||
           args.contains('${path.separator}packages'))).toList();
 
   files.forEach((String f) {
     // Only include libraries at the top level of "lib"
     if (path.basename(path.dirname(f)) == 'lib') {
       // Only add the file if it does not contain 'part of'
       // TODO(janicejl): Remove when Issue(12406) is resolved.
       var contents = new File(f).readAsStringSync();
       if (!(contents.contains(new RegExp('\npart of ')) ||
           contents.startsWith(new RegExp('part of ')))) {
-        libraries.add(f);
+        libraries.add(new Uri.file(path.normalize(path.absolute(f))));
         logger.info('Added to libraries: $f');
       }
     }
   });
-  return libraries.map(path.absolute).map(path.normalize).toList();
+  return libraries;
 }
 
 String _findPackageRoot(String directory) {
   var files = listDir(directory, recursive: true);
   // Return '' means that there was no pubspec.yaml and therefor no packageRoot.
   String packageRoot = files.firstWhere((f) =>
       f.endsWith('${path.separator}pubspec.yaml'), orElse: () => '');
   if (packageRoot != '') {
     packageRoot = path.join(path.dirname(packageRoot), 'packages');
   }
   return packageRoot;
 }
 
 /// Read a pubspec and return the library name.
 String _packageName(String pubspecName) {
   File pubspec = new File(pubspecName);
   if (!pubspec.existsSync()) return '';
   var contents = pubspec.readAsStringSync();
   var spec = loadYaml(contents);
   return spec["name"];
 }
 
-List<String> _listSdk() {
-  var sdk = new List<String>();
+List<Uri> _listSdk() {
+  var sdk = new List<Uri>();
   LIBRARIES.forEach((String name, LibraryInfo info) {
     if (info.documented) {
-      sdk.add('dart:$name');
+      sdk.add(Uri.parse('dart:$name'));
       logger.info('Add to SDK: ${sdk.last}');
     }
   });
   return sdk;
 }
 
 /// Analyzes set of libraries by getting a mirror system and triggers the
 /// documentation of the libraries.
-Future<MirrorSystem> getMirrorSystem(List<String> libraries,
+Future<MirrorSystem> getMirrorSystem(List<Uri> libraries,
     {String packageRoot, bool parseSdk: false}) {
   if (libraries.isEmpty) throw new StateError('No Libraries.');
   // Finds the root of SDK library based off the location of docgen.
 
   var root = findRootDirectory();
   var sdkRoot = path.normalize(path.absolute(path.join(root, 'sdk')));
   logger.info('SDK Root: ${sdkRoot}');
   return _analyzeLibraries(libraries, sdkRoot, packageRoot: packageRoot);
 }
 
 String findRootDirectory() {
   var scriptDir = path.absolute(path.dirname(Platform.script.toFilePath()));
   var root = scriptDir;
   while(path.basename(root) != 'dart') {
     root = path.dirname(root);
   }
   return root;
 }
 
 /// Analyzes set of libraries and provides a mirror system which can be used
 /// for static inspection of the source code.
-Future<MirrorSystem> _analyzeLibraries(List<String> libraries,
+Future<MirrorSystem> _analyzeLibraries(List<Uri> libraries,
       String libraryRoot, {String packageRoot}) {
   SourceFileProvider provider = new CompilerSourceFileProvider();
   api.DiagnosticHandler diagnosticHandler =
       (new FormattingDiagnosticHandler(provider)
         ..showHints = false
         ..showWarnings = false)
           .diagnosticHandler;
-  Uri libraryUri = new Uri(scheme: 'file', path: appendSlash(libraryRoot));
+  Uri libraryUri = new Uri.file(appendSlash(libraryRoot));
   Uri packageUri = null;
   if (packageRoot != null) {
-    packageUri = new Uri(scheme: 'file', path: appendSlash(packageRoot));
+    packageUri = new Uri.file(appendSlash(packageRoot));
   }
-  List<Uri> librariesUri = <Uri>[];
-  libraries.forEach((library) {
-    librariesUri.add(currentDirectory.resolve(library));
-  });
-  return dart2js.analyze(librariesUri, libraryUri, packageUri,
+  return dart2js.analyze(libraries, libraryUri, packageUri,
       provider.readStringFromUri, diagnosticHandler,
       ['--preserve-comments', '--categories=Client,Server'])
       ..catchError((error) {
         logger.severe('Error: Failed to create mirror system. ');
         // TODO(janicejl): Use the stack trace package when bug is resolved.
         // Currently, a string is thrown when it fails to create a mirror
         // system, and it is not possible to use the stack trace. BUG(#11622)
         // To avoid printing the stack trace.
         exit(1);
       });
@@ skipping 1193 matching lines @@
 /// Remove statics from the map of inherited items before adding them.
 Map _filterStatics(Map items) {
   var result = {};
   items.forEach((name, item) {
     if (!item.isStatic) {
       result[name] = item;
     }
   });
   return result;
 }