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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 library front_end.memory_file_system; | 5 library front_end.memory_file_system; |
6 | 6 |
7 import 'dart:async'; | 7 import 'dart:async'; |
8 import 'dart:convert'; | 8 import 'dart:convert'; |
9 import 'dart:typed_data'; | 9 import 'dart:typed_data'; |
10 | 10 |
11 import 'package:path/path.dart' as p; | |
12 | |
13 import 'file_system.dart'; | 11 import 'file_system.dart'; |
14 | 12 |
15 /// Concrete implementation of [FileSystem] which performs its operations on an | 13 /// Concrete implementation of [FileSystem] which performs its operations on an |
16 /// in-memory virtual file system. | 14 /// in-memory virtual file system. |
17 /// | 15 /// |
18 /// Not intended to be implemented or extended by clients. | 16 /// Not intended to be implemented or extended by clients. |
19 class MemoryFileSystem implements FileSystem { | 17 class MemoryFileSystem implements FileSystem { |
20 @override | 18 final Map<Uri, Uint8List> _files = {}; |
21 final p.Context context; | 19 final Map<Uri, DateTime> _lastModified = {}; |
22 | 20 |
23 final Map<Uri, Uint8List> _files = {}; | 21 // Counter used to create mock last-modification timestamps. The memory |
| 22 // file-system is mainly used for testing, so we use mock timestamps to avoid |
| 23 // introducing non-determinism. |
| 24 int _lastUpdate = 0; |
24 | 25 |
25 /// The "current directory" in the in-memory virtual file system. | 26 /// The "current directory" in the in-memory virtual file system. |
26 /// | 27 /// |
27 /// This is used to convert relative URIs to absolute URIs. | 28 /// This is used to convert relative URIs to absolute URIs. |
28 /// | 29 /// |
29 /// Always ends in a trailing '/'. | 30 /// Always ends in a trailing '/'. |
30 Uri currentDirectory; | 31 Uri currentDirectory; |
31 | 32 |
32 MemoryFileSystem(this.context, Uri currentDirectory) | 33 MemoryFileSystem(Uri currentDirectory) |
33 : currentDirectory = _addTrailingSlash(currentDirectory); | 34 : currentDirectory = _addTrailingSlash(currentDirectory); |
34 | 35 |
35 @override | 36 @override |
36 MemoryFileSystemEntity entityForUri(Uri uri) { | 37 MemoryFileSystemEntity entityForUri(Uri uri) { |
37 return new MemoryFileSystemEntity._( | 38 return new MemoryFileSystemEntity._( |
38 this, currentDirectory.resolveUri(uri).normalizePath()); | 39 this, currentDirectory.resolveUri(uri).normalizePath()); |
39 } | 40 } |
40 | 41 |
41 static Uri _addTrailingSlash(Uri uri) { | 42 static Uri _addTrailingSlash(Uri uri) { |
42 if (!uri.path.endsWith('/')) { | 43 if (!uri.path.endsWith('/')) { |
(...skipping 30 matching lines...) Expand all Loading... |
73 } | 74 } |
74 throw new Exception('File does not exist'); | 75 throw new Exception('File does not exist'); |
75 } | 76 } |
76 | 77 |
77 @override | 78 @override |
78 Future<String> readAsString() async { | 79 Future<String> readAsString() async { |
79 List<int> contents = await readAsBytes(); | 80 List<int> contents = await readAsBytes(); |
80 return UTF8.decode(contents); | 81 return UTF8.decode(contents); |
81 } | 82 } |
82 | 83 |
| 84 @override |
| 85 Future<bool> exists() async => _fileSystem._files[uri] != null; |
| 86 |
| 87 @override |
| 88 Future<DateTime> lastModified() async { |
| 89 var lastModified = _fileSystem._lastModified[uri]; |
| 90 if (lastModified == null) { |
| 91 throw new Exception('File does not exist'); |
| 92 } |
| 93 return lastModified; |
| 94 } |
| 95 |
83 /// Writes the given raw bytes to this file system entity. | 96 /// Writes the given raw bytes to this file system entity. |
84 /// | 97 /// |
85 /// If no file exists, one is created. If a file exists already, it is | 98 /// If no file exists, one is created. If a file exists already, it is |
86 /// overwritten. | 99 /// overwritten. |
87 void writeAsBytesSync(List<int> bytes) { | 100 void writeAsBytesSync(List<int> bytes) { |
88 _fileSystem._files[uri] = new Uint8List.fromList(bytes); | 101 _update(uri, new Uint8List.fromList(bytes)); |
89 } | 102 } |
90 | 103 |
91 /// Writes the given string to this file system entity. | 104 /// Writes the given string to this file system entity. |
92 /// | 105 /// |
93 /// The string is encoded as UTF-8. | 106 /// The string is encoded as UTF-8. |
94 /// | 107 /// |
95 /// If no file exists, one is created. If a file exists already, it is | 108 /// If no file exists, one is created. If a file exists already, it is |
96 /// overwritten. | 109 /// overwritten. |
97 void writeAsStringSync(String s) { | 110 void writeAsStringSync(String s) { |
98 // Note: the return type of UTF8.encode is List<int>, but in practice it | 111 // Note: the return type of UTF8.encode is List<int>, but in practice it |
99 // always returns Uint8List. We rely on that for efficiency, so that we | 112 // always returns Uint8List. We rely on that for efficiency, so that we |
100 // don't have to make an extra copy. | 113 // don't have to make an extra copy. |
101 _fileSystem._files[uri] = UTF8.encode(s) as Uint8List; | 114 _update(uri, UTF8.encode(s) as Uint8List); |
| 115 } |
| 116 |
| 117 void _update(Uri uri, Uint8List data) { |
| 118 _fileSystem._files[uri] = data; |
| 119 _fileSystem._lastModified[uri] = |
| 120 new DateTime.fromMicrosecondsSinceEpoch(++_fileSystem._lastUpdate); |
102 } | 121 } |
103 } | 122 } |
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