Add writeAsStringSync (issue 27109)

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:convert';
 import 'dart:core' hide Resource;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/source/source_resource.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})
       : _pathContext = isWindows ? windows : posix,
         absolutePathContext = new AbsolutePathContext(isWindows);
 
   @override
   Context get pathContext => _pathContext;
 
   /**
    * Delete the file with the given path.
    */
   void deleteFile(String path) {
     _checkFileAtPath(path);
     _pathToResource.remove(path);
-    _pathToContent.remove(path);
+    _pathToBytes.remove(path);
     _pathToTimestamp.remove(path);
     _notifyWatchers(path, ChangeType.REMOVE);
   }
 
   /**
    * Delete the folder with the given path
    * and recursively delete nested files and folders.
    */
   void deleteFolder(String path) {
     _checkFolderAtPath(path);
     _MemoryFolder folder = _pathToResource[path];
     for (Resource child in folder.getChildren()) {
       if (child is File) {
         deleteFile(child.path);
       } else if (child is Folder) {
         deleteFolder(child.path);
       } else {
         throw 'failed to delete resource: $child';
       }
     }
     _pathToResource.remove(path);
-    _pathToContent.remove(path);
+    _pathToBytes.remove(path);
     _pathToTimestamp.remove(path);
     _notifyWatchers(path, ChangeType.REMOVE);
   }
 
   @override
   File getFile(String path) => new _MemoryFile(this, path);
 
   @override
   Folder getFolder(String path) => newFolder(path);
 
@@ skipping 15 matching lines @@
     return resource;
   }
 
   @override
   Folder getStateLocation(String pluginId) {
     return newFolder('/user/home/$pluginId');
   }
 
   void modifyFile(String path, String content) {
     _checkFileAtPath(path);
-    _pathToContent[path] = content;
+    _pathToBytes[path] = UTF8.encode(content);
     _pathToTimestamp[path] = nextStamp++;
     _notifyWatchers(path, ChangeType.MODIFY);
   }
 
   /**
    * Create a resource representing a dummy link (that is, a File object which
    * appears in its parent directory, but whose `exists` property is false)
    */
   File newDummyLink(String path) {
     path = pathContext.normalize(path);
     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);
     _MemoryFile file = _newFile(path);
-    _pathToContent[path] = content;
+    _pathToBytes[path] = UTF8.encode(content);
     _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++;
@@ skipping 32 matching lines @@
     if (newPath == path) {
       return file;
     }
     _MemoryResource existingNewResource = _pathToResource[newPath];
     if (existingNewResource is _MemoryFolder) {
       throw new FileSystemException(
           path, 'Could not be renamed: $newPath is a folder.');
     }
     _MemoryFile newFile = _newFile(newPath);
     _pathToResource.remove(path);
-    _pathToContent[newPath] = _pathToContent.remove(path);
     _pathToBytes[newPath] = _pathToBytes.remove(path);
     _pathToTimestamp[newPath] = _pathToTimestamp.remove(path);
     if (existingNewResource != null) {
       _notifyWatchers(newPath, ChangeType.REMOVE);
     }
     _notifyWatchers(path, ChangeType.REMOVE);
     _notifyWatchers(newPath, ChangeType.ADD);
     return newFile;
   }
 
   File updateFile(String path, String content, [int stamp]) {
     path = pathContext.normalize(path);
     newFolder(pathContext.dirname(path));
     _MemoryFile file = new _MemoryFile(this, path);
     _pathToResource[path] = file;
-    _pathToContent[path] = content;
+    _pathToBytes[path] = UTF8.encode(content);
     _pathToTimestamp[path] = stamp ?? nextStamp++;
     _notifyWatchers(path, ChangeType.MODIFY);
     return file;
   }
 
   void _checkFileAtPath(String path) {
     _MemoryResource resource = _pathToResource[path];
     if (resource is! _MemoryFile) {
       throw new ArgumentError(
           'File expected at "$path" but ${resource.runtimeType} found');
@@ skipping 29 matching lines @@
         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(_MemoryFile file, List<int> bytes) {
+  void _setFileContent(_MemoryFile file, List<int> bytes) {
     String path = file.path;
     _pathToResource[path] = file;
     _pathToBytes[path] = bytes;
     _pathToTimestamp[path] = nextStamp++;
     _notifyWatchers(path, ChangeType.MODIFY);
   }
 }
 
 /**
  * An in-memory implementation of [File] which acts like a symbolic link to a
@@ skipping 50 matching lines @@
     throw new FileSystemException(path, 'File could not be renamed');
   }
 
   @override
   Uri toUri() => new Uri.file(path, windows: _provider.pathContext == windows);
 
   @override
   void writeAsBytesSync(List<int> bytes) {
     throw new FileSystemException(path, 'File could not be written');
   }
+
+  @override
+  void writeAsStringSync(String content) {
+    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 19 matching lines @@
     _provider.deleteFile(path);
   }
 
   @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 "$path" is not binary.');
-    }
-    return bytes;
-  }
-
-  @override
-  String readAsStringSync() {
-    String content = _provider._pathToContent[path];
+    List<int> content = _provider._pathToBytes[path];
     if (content == null) {
       throw new FileSystemException(path, 'File "$path" does not exist.');
     }
     return content;
   }
 
   @override
+  String readAsStringSync() {
+    List<int> content = _provider._pathToBytes[path];
+    if (content == null) {
+      throw new FileSystemException(path, 'File "$path" does not exist.');
+    }
+    return UTF8.decode(content);
+  }
+
+  @override
   File renameSync(String newPath) {
     return _provider.renameFileSync(this, newPath);
   }
 
   @override
   Uri toUri() => new Uri.file(path, windows: _provider.pathContext == windows);
 
   @override
   void writeAsBytesSync(List<int> bytes) {
-    _provider._setFileBytes(this, bytes);
+    _provider._setFileContent(this, bytes);
+  }
+
+  @override
+  void writeAsStringSync(String content) {
+    _provider._setFileContent(this, UTF8.encode(content));
   }
 }
 
 /**
  * An in-memory implementation of [Folder].
  */
 class _MemoryFolder extends _MemoryResource implements Folder {
   _MemoryFolder(MemoryResourceProvider provider, String path)
       : super(provider, path);
 
@@ skipping 120 matching lines @@
   bool operator ==(other) {
     if (runtimeType != other.runtimeType) {
       return false;
     }
     return path == other.path;
   }
 
   @override
   String toString() => path;
 }