dart:io | Add FileSystemEntity.stat() and FileStat class.

tests/standalone/io/file_stat_test.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.
+//
+// Dart test program for testing dart:io FileSystemEntity.Stat().
+
+import "package:expect/expect.dart";
+import 'dart:async';
+import 'dart:io';
+import 'dart:isolate';
+
+void testStat() {
+  Directory directory = new Directory("").createTempSync();
+  File file = new File.fromPath(new Path(directory.path).append("file"));
+  FileStat nonExistent = FileStat.statSync(file.path);
+  Expect.equals(FileSystemEntityType.NOT_FOUND, nonExistent.type);
+  file.writeAsStringSync("Dart IO library test of FileStat");
+  new Timer(const Duration(seconds: 2), () {
+    file.readAsStringSync();
+    directory.listSync();
+    FileStat fileStat = FileStat.statSync(file.path);
+    Expect.equals(FileSystemEntityType.FILE, fileStat.type);
+    Expect.equals(32, fileStat.size);
+    Expect.isTrue(fileStat.modified.compareTo(fileStat.accessed) < 0);
+    Expect.isTrue(fileStat.changed.compareTo(fileStat.accessed) < 0);
+    Expect.equals(6 << 6, fileStat.mode & (6 << 6));  // Mode includes +urw.
+    FileStat directoryStat = FileStat.statSync(directory.path);
+    Expect.equals(FileSystemEntityType.DIRECTORY, directoryStat.type);
+    Expect.isTrue(directoryStat.modified.compareTo(directoryStat.accessed) < 0);
+    Expect.isTrue(directoryStat.changed.compareTo(directoryStat.accessed) < 0);
+    Expect.equals(7 << 6, directoryStat.mode & (7 << 6));  // Includes +urwx.
+    directory.deleteSync(recursive: true);
+  });
+}
+
+
+Future testStatAsync() {
+  return new Directory("").createTemp()
+  .then((directory) {
+    File file = new File.fromPath(new Path(directory.path).append("file"));
+    return FileStat.stat(file.path)
+    .then((missingStat) {
+      Expect.equals(FileSystemEntityType.NOT_FOUND, missingStat.type);
+    })
+    .then((_) => file.writeAsString("Dart IO library test of FileStat"))
+    .then((_) => new Future.delayed(const Duration(seconds: 2)))
+    .then((_) => file.readAsString())
+    .then((_) => directory.list().last)
+    .then((_) => FileStat.stat(file.path))
+    .then((FileStat fileStat) {
+      Expect.equals(FileSystemEntityType.FILE, fileStat.type);
+      Expect.equals(32, fileStat.size);
+      Expect.isTrue(fileStat.modified.compareTo(fileStat.accessed) < 0);
+      Expect.isTrue(fileStat.changed.compareTo(fileStat.accessed) < 0);
+      Expect.equals(6 << 6, fileStat.mode & (6 << 6));  // Mode includes +urw.
+      return FileStat.stat(directory.path);
+    })
+    .then((FileStat directoryStat) {
+      Expect.equals(FileSystemEntityType.DIRECTORY, directoryStat.type);
+      Expect.isTrue(
+          directoryStat.modified.compareTo(directoryStat.accessed) < 0);
+      Expect.isTrue(
+          directoryStat.changed.compareTo(directoryStat.accessed) < 0);
+      Expect.equals(7 << 6, directoryStat.mode & (7 << 6));  // Includes +urwx.
+      return directory.delete(recursive: true);
+    });
+  });
+}
+
+
+void main() {
+  ReceivePort keepAlive = new ReceivePort();
+  testStat();
+  testStatAsync().then((_) => keepAlive.close());
+}