Add File.readAsBytesSync/writeAsBytesSync() methods.

pkg/analyzer/lib/file_system/memory_file_system.dart

 // Copyright (c) 2014, 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 analyzer.file_system.memory_file_system;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core' hide Resource;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart' show TimestampedData;
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/util/absolute_path.dart';
 import 'package:path/path.dart';
 import 'package:watcher/watcher.dart';
 
 /**
  * An in-memory implementation of [ResourceProvider].
  * Use `/` as a path separator.
  */
 class MemoryResourceProvider implements ResourceProvider {
   final Map<String, _MemoryResource> _pathToResource =
       new HashMap<String, _MemoryResource>();
   final Map<String, String> _pathToContent = new HashMap<String, String>();
+  final Map<String, List<int>> _pathToBytes = new HashMap<String, List<int>>();
   final Map<String, int> _pathToTimestamp = new HashMap<String, int>();
   final Map<String, List<StreamController<WatchEvent>>> _pathToWatchers =
       new HashMap<String, List<StreamController<WatchEvent>>>();
   int nextStamp = 0;
 
   final Context _pathContext;
   @override
   final AbsolutePathContext absolutePathContext;
 
   MemoryResourceProvider({bool isWindows: false})
@@ skipping 73 matching lines @@
     newFolder(pathContext.dirname(path));
     _MemoryDummyLink link = new _MemoryDummyLink(this, path);
     _pathToResource[path] = link;
     _pathToTimestamp[path] = nextStamp++;
     _notifyWatchers(path, ChangeType.ADD);
     return link;
   }
 
   File newFile(String path, String content, [int stamp]) {
     path = pathContext.normalize(path);
-    _MemoryResource folder = _pathToResource[pathContext.dirname(path)];
-    if (folder == null) {
-      newFolder(pathContext.dirname(path));
-    } else if (folder is! Folder) {
-      throw new ArgumentError('Cannot create file ($path) as child of file');
-    }
-    _MemoryFile file = new _MemoryFile(this, path);
-    _pathToResource[path] = file;
+    _MemoryFile file = _newFile(path);
     _pathToContent[path] = content;
-    _pathToTimestamp[path] = stamp != null ? stamp : nextStamp++;
+    _pathToTimestamp[path] = stamp ?? nextStamp++;
     _notifyWatchers(path, ChangeType.ADD);
     return file;
   }
+
+  File newFileWithBytes(String path, List<int> bytes, [int stamp]) {
+    path = pathContext.normalize(path);
+    _MemoryFile file = _newFile(path);
+    _pathToBytes[path] = bytes;
+    _pathToTimestamp[path] = stamp ?? nextStamp++;
+    _notifyWatchers(path, ChangeType.ADD);
+    return file;
+  }
 
   Folder newFolder(String path) {
     path = pathContext.normalize(path);
     if (!pathContext.isAbsolute(path)) {
       throw new ArgumentError("Path must be absolute : $path");
     }
     _MemoryResource resource = _pathToResource[path];
     if (resource == null) {
       String parentPath = pathContext.dirname(path);
       if (parentPath != path) {
@@ skipping 34 matching lines @@
   }
 
   void _checkFolderAtPath(String path) {
     _MemoryResource resource = _pathToResource[path];
     if (resource is! _MemoryFolder) {
       throw new ArgumentError(
           'Folder expected at "$path" but ${resource.runtimeType} found');
     }
   }
 
+  /**
+   * Create a new [_MemoryFile] without any content.
+   */
+  _MemoryFile _newFile(String path) {
+    String folderPath = pathContext.dirname(path);
+    _MemoryResource folder = _pathToResource[folderPath];
+    if (folder == null) {
+      newFolder(folderPath);
+    } else if (folder is! Folder) {
+      throw new ArgumentError('Cannot create file ($path) as child of file');
+    }
+    _MemoryFile file = new _MemoryFile(this, path);
+    _pathToResource[path] = file;
+    return file;
+  }
+
   void _notifyWatchers(String path, ChangeType changeType) {
     _pathToWatchers.forEach((String watcherPath,
         List<StreamController<WatchEvent>> streamControllers) {
       if (watcherPath == path || pathContext.isWithin(watcherPath, path)) {
         for (StreamController<WatchEvent> streamController
             in streamControllers) {
           streamController.add(new WatchEvent(changeType, path));
         }
       }
     });
   }
+
+  void _setFileBytes(String path, List<int> bytes) {
+    _pathToBytes[path] = bytes;
+    _pathToTimestamp[path] = nextStamp++;
+    _notifyWatchers(path, ChangeType.MODIFY);
+  }
 }
 
 /**
  * An in-memory implementation of [File] which acts like a symbolic link to a
  * non-existent file.
  */
 class _MemoryDummyLink extends _MemoryResource implements File {
   _MemoryDummyLink(MemoryResourceProvider provider, String path)
       : super(provider, path);
 
@@ skipping 22 matching lines @@
   Source createSource([Uri uri]) {
     throw new FileSystemException(path, 'File could not be read');
   }
 
   @override
   bool isOrContains(String path) {
     return path == this.path;
   }
 
   @override
+  List<int> readAsBytesSync() {
+    throw new FileSystemException(path, 'File could not be read');
+  }
+
+  @override
   String readAsStringSync() {
     throw new FileSystemException(path, 'File could not be read');
   }
+
+  @override
+  void writeAsBytesSync(List<int> bytes) {
+    throw new FileSystemException(path, 'File could not be written');
+  }
 }
 
 /**
  * An in-memory implementation of [File].
  */
 class _MemoryFile extends _MemoryResource implements File {
   _MemoryFile(MemoryResourceProvider provider, String path)
       : super(provider, path);
 
   @override
@@ skipping 23 matching lines @@
     }
     return new _MemoryFileSource(this, uri);
   }
 
   @override
   bool isOrContains(String path) {
     return path == this.path;
   }
 
   @override
+  List<int> readAsBytesSync() {
+    List<int> bytes = _provider._pathToBytes[path];
+    if (bytes == null) {
+      throw new FileSystemException(path, 'File "$path" is not binary.');
+    }
+    return bytes;
+  }
+
+  @override
   String readAsStringSync() {
     String content = _provider._pathToContent[path];
     if (content == null) {
       throw new FileSystemException(path, 'File "$path" does not exist.');
     }
     return content;
   }
+
+  @override
+  void writeAsBytesSync(List<int> bytes) {
+    _provider._setFileBytes(path, bytes);
+  }
 }
 
 /**
  * An in-memory implementation of [Source].
  */
 class _MemoryFileSource extends Source {
   /**
    * Map from encoded URI/filepath pair to a unique integer identifier.  This
    * identifier is used for equality tests and hash codes.
    *
@@ skipping 195 matching lines @@
   bool operator ==(other) {
     if (runtimeType != other.runtimeType) {
       return false;
     }
     return path == other.path;
   }
 
   @override
   String toString() => path;
 }