Add implementations of the front end FileSystem API.

pkg/front_end/test/physical_file_system_test.dart

+// Copyright (c) 2016, 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.
+// SharedOptions=--supermixin
+
+library front_end.test.physical_file_system_test;
+
+import 'dart:convert';
+import 'dart:io' as io;
+
+import 'package:front_end/file_system.dart';
+import 'package:front_end/physical_file_system.dart';
+import 'package:path/path.dart' as p;
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(PhysicalFileSystemTest);
+    defineReflectiveTests(FileTest);
+  });
+}
+
+@reflectiveTest
+class FileTest extends _BaseTest {
+  String path;
+  FileSystemEntity file;
+
+  setUp() {
+    super.setUp();
+    path = p.join(tempPath, 'file.txt');
+    file = PhysicalFileSystem.instance.entityForPath(path);
+  }
+
+  test_equals_differentPaths() {
+    expect(
+        file ==
+            PhysicalFileSystem.instance
+                .entityForPath(p.join(tempPath, 'file2.txt')),
+        isFalse);
+  }
+
+  test_equals_samePath() {
+    expect(
+        file ==
+            PhysicalFileSystem.instance
+                .entityForPath(p.join(tempPath, 'file.txt')),
+        isTrue);
+  }
+
+  test_hashCode_samePath() {
+    expect(
+        file.hashCode,
+        PhysicalFileSystem.instance
+            .entityForPath(p.join(tempPath, 'file.txt'))
+            .hashCode);
+  }
+
+  test_path() {
+    expect(file.path, path);
+  }
+
+  test_readAsBytes_badUtf8() async {
+    // A file containing invalid UTF-8 can still be read as raw bytes.
+    List<int> bytes = [0xc0, 0x40]; // Invalid UTF-8
+    new io.File(path).writeAsBytesSync(bytes);
+    expect(await file.readAsBytes(), bytes);
+  }
+
+  test_readAsBytes_doesNotExist() {
+    expect(file.readAsBytes(), throwsException);
+  }
+
+  test_readAsBytes_exists() async {
+    var s = 'contents';
+    new io.File(path).writeAsStringSync(s);
+    expect(await file.readAsBytes(), UTF8.encode(s));
+  }
+
+  test_readAsString_badUtf8() {
+    new io.File(path).writeAsBytesSync([0xc0, 0x40]); // Invalid UTF-8
+    expect(file.readAsString(), throwsException);
+  }
+
+  test_readAsString_doesNotExist() {
+    expect(file.readAsString(), throwsException);
+  }
+
+  test_readAsString_exists() async {
+    var s = 'contents';
+    new io.File(path).writeAsStringSync(s);
+    expect(await file.readAsString(), s);
+  }
+
+  test_readAsString_utf8() async {
+    var bytes = [0xe2, 0x82, 0xac]; // Unicode € symbol (in UTF-8)
+    new io.File(path).writeAsBytesSync(bytes);
+    expect(await file.readAsString(), '\u20ac');
+  }
+}
+
+@reflectiveTest
+class PhysicalFileSystemTest extends _BaseTest {
+  Uri tempUri;
+
+  setUp() {
+    super.setUp();
+    tempUri = new Uri.directory(tempPath);
+  }
+
+  test_entityForPath() {
+    var path = p.join(tempPath, 'file.txt');
+    expect(PhysicalFileSystem.instance.entityForPath(path).path, path);
+  }
+
+  test_entityForPath_absolutize() {
+    expect(PhysicalFileSystem.instance.entityForPath('file.txt').path,
+        new io.File('file.txt').absolute.path);
+  }
+
+  test_entityForPath_normalize_dot() {
+    expect(
+        PhysicalFileSystem.instance
+            .entityForPath(p.join(tempPath, '.', 'file.txt'))
+            .path,
+        p.join(tempPath, 'file.txt'));
+  }
+
+  test_entityForPath_normalize_dotDot() {
+    expect(
+        PhysicalFileSystem.instance
+            .entityForPath(p.join(tempPath, 'foo', '..', 'file.txt'))
+            .path,
+        p.join(tempPath, 'file.txt'));
+  }
+
+  test_entityForUri() {
+    expect(
+        PhysicalFileSystem.instance
+            .entityForUri(Uri.parse('$tempUri/file.txt'))
+            .path,
+        p.join(tempPath, 'file.txt'));
+  }
+
+  test_entityForUri_bareUri_absolute() {
+    expect(
+        () => PhysicalFileSystem.instance.entityForUri(Uri.parse('/file.txt')),
+        throwsA(new isInstanceOf<Error>()));
+  }
+
+  test_entityForUri_bareUri_relative() {
+    expect(
+        () => PhysicalFileSystem.instance.entityForUri(Uri.parse('file.txt')),
+        throwsA(new isInstanceOf<Error>()));
+  }
+
+  test_entityForUri_nonFileUri() {
+    expect(
+        () => PhysicalFileSystem.instance
+            .entityForUri(Uri.parse('package:foo/bar.dart')),
+        throwsA(new isInstanceOf<Error>()));
+  }
+
+  test_entityForUri_normalize_dot() {
+    expect(
+        PhysicalFileSystem.instance
+            .entityForUri(Uri.parse('$tempUri/./file.txt'))
+            .path,
+        p.join(tempPath, 'file.txt'));
+  }
+
+  test_entityForUri_normalize_dotDot() {
+    expect(
+        PhysicalFileSystem.instance
+            .entityForUri(Uri.parse('$tempUri/foo/../file.txt'))
+            .path,
+        p.join(tempPath, 'file.txt'));
+  }
+}
+
+class _BaseTest {
+  io.Directory tempDirectory;
+  String tempPath;
+
+  setUp() {
+    tempDirectory = io.Directory.systemTemp.createTempSync('test_file_system');
+    tempPath = tempDirectory.absolute.path;
+  }
+
+  tearDown() {
+    tempDirectory.deleteSync(recursive: true);
+  }
+}