Move the wire protocol support into the public API

pkg/analysis_server/lib/src/protocol.dart

Index: pkg/analysis_server/lib/src/protocol.dart
diff --git a/pkg/analysis_server/lib/src/protocol.dart b/pkg/analysis_server/lib/src/protocol.dart
deleted file mode 100644
index ef960f06d385e0155a6909bcfa0a76d4927d18ea..0000000000000000000000000000000000000000
--- a/pkg/analysis_server/lib/src/protocol.dart
+++ /dev/null
@@ -1,999 +0,0 @@
-// 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 protocol;
-
-import 'dart:collection';
-import 'dart:convert';
-
-part 'generated_protocol.dart';
-
-final Map<String, RefactoringKind> REQUEST_ID_REFACTORING_KINDS =
-    new HashMap<String, RefactoringKind>();
-
-/**
- * Translate the input [map], applying [keyCallback] to all its keys, and
- * [valueCallback] to all its values.
- */
-mapMap(Map map, {dynamic keyCallback(key), dynamic valueCallback(value)}) {
-  Map result = {};
-  map.forEach((key, value) {
-    if (keyCallback != null) {
-      key = keyCallback(key);
-    }
-    if (valueCallback != null) {
-      value = valueCallback(value);
-    }
-    result[key] = value;
-  });
-  return result;
-}
-
-/**
- * Adds the given [sourceEdits] to the list in [sourceFileEdit].
- */
-void _addAllEditsForSource(
-    SourceFileEdit sourceFileEdit, Iterable<SourceEdit> edits) {
-  edits.forEach(sourceFileEdit.add);
-}
-
-/**
- * Adds the given [sourceEdit] to the list in [sourceFileEdit].
- */
-void _addEditForSource(SourceFileEdit sourceFileEdit, SourceEdit sourceEdit) {
-  List<SourceEdit> edits = sourceFileEdit.edits;
-  int index = 0;
-  while (index < edits.length && edits[index].offset > sourceEdit.offset) {
-    index++;
-  }
-  edits.insert(index, sourceEdit);
-}
-
-/**
- * Adds [edit] to the [FileEdit] for the given [file].
- */
-void _addEditToSourceChange(
-    SourceChange change, String file, int fileStamp, SourceEdit edit) {
-  SourceFileEdit fileEdit = change.getFileEdit(file);
-  if (fileEdit == null) {
-    fileEdit = new SourceFileEdit(file, fileStamp);
-    change.addFileEdit(fileEdit);
-  }
-  fileEdit.add(edit);
-}
-
-/**
- * Get the result of applying the edit to the given [code].  Access via
- * SourceEdit.apply().
- */
-String _applyEdit(String code, SourceEdit edit) {
-  if (edit.length < 0) {
-    throw new RangeError('length is negative');
-  }
-  return code.replaceRange(edit.offset, edit.end, edit.replacement);
-}
-
-/**
- * Get the result of applying a set of [edits] to the given [code].  Edits
- * are applied in the order they appear in [edits].  Access via
- * SourceEdit.applySequence().
- */
-String _applySequence(String code, Iterable<SourceEdit> edits) {
-  edits.forEach((SourceEdit edit) {
-    code = edit.apply(code);
-  });
-  return code;
-}
-
-/**
- * Returns the [FileEdit] for the given [file], maybe `null`.
- */
-SourceFileEdit _getChangeFileEdit(SourceChange change, String file) {
-  for (SourceFileEdit fileEdit in change.edits) {
-    if (fileEdit.file == file) {
-      return fileEdit;
-    }
-  }
-  return null;
-}
-
-/**
- * Compare the lists [listA] and [listB], using [itemEqual] to compare
- * list elements.
- */
-bool _listEqual(List listA, List listB, bool itemEqual(a, b)) {
-  if (listA == null) {
-    return listB == null;
-  }
-  if (listB == null) {
-    return false;
-  }
-  if (listA.length != listB.length) {
-    return false;
-  }
-  for (int i = 0; i < listA.length; i++) {
-    if (!itemEqual(listA[i], listB[i])) {
-      return false;
-    }
-  }
-  return true;
-}
-
-/**
- * Compare the maps [mapA] and [mapB], using [valueEqual] to compare map
- * values.
- */
-bool _mapEqual(Map mapA, Map mapB, bool valueEqual(a, b)) {
-  if (mapA == null) {
-    return mapB == null;
-  }
-  if (mapB == null) {
-    return false;
-  }
-  if (mapA.length != mapB.length) {
-    return false;
-  }
-  for (var key in mapA.keys) {
-    if (!mapB.containsKey(key)) {
-      return false;
-    }
-    if (!valueEqual(mapA[key], mapB[key])) {
-      return false;
-    }
-  }
-  return true;
-}
-
-RefactoringProblemSeverity _maxRefactoringProblemSeverity(
-    RefactoringProblemSeverity a, RefactoringProblemSeverity b) {
-  if (b == null) {
-    return a;
-  }
-  if (a == null) {
-    return b;
-  } else if (a == RefactoringProblemSeverity.INFO) {
-    return b;
-  } else if (a == RefactoringProblemSeverity.WARNING) {
-    if (b == RefactoringProblemSeverity.ERROR ||
-        b == RefactoringProblemSeverity.FATAL) {
-      return b;
-    }
-  } else if (a == RefactoringProblemSeverity.ERROR) {
-    if (b == RefactoringProblemSeverity.FATAL) {
-      return b;
-    }
-  }
-  return a;
-}
-
-/**
- * Create a [RefactoringFeedback] corresponding the given [kind].
- */
-RefactoringFeedback _refactoringFeedbackFromJson(
-    JsonDecoder jsonDecoder, String jsonPath, Object json, Map feedbackJson) {
-  RefactoringKind kind = jsonDecoder.refactoringKind;
-  if (kind == RefactoringKind.EXTRACT_LOCAL_VARIABLE) {
-    return new ExtractLocalVariableFeedback.fromJson(
-        jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.EXTRACT_METHOD) {
-    return new ExtractMethodFeedback.fromJson(jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.INLINE_LOCAL_VARIABLE) {
-    return new InlineLocalVariableFeedback.fromJson(
-        jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.INLINE_METHOD) {
-    return new InlineMethodFeedback.fromJson(jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.RENAME) {
-    return new RenameFeedback.fromJson(jsonDecoder, jsonPath, json);
-  }
-  return null;
-}
-
-/**
- * Create a [RefactoringOptions] corresponding the given [kind].
- */
-RefactoringOptions _refactoringOptionsFromJson(JsonDecoder jsonDecoder,
-    String jsonPath, Object json, RefactoringKind kind) {
-  if (kind == RefactoringKind.EXTRACT_LOCAL_VARIABLE) {
-    return new ExtractLocalVariableOptions.fromJson(
-        jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.EXTRACT_METHOD) {
-    return new ExtractMethodOptions.fromJson(jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.INLINE_METHOD) {
-    return new InlineMethodOptions.fromJson(jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.MOVE_FILE) {
-    return new MoveFileOptions.fromJson(jsonDecoder, jsonPath, json);
-  }
-  if (kind == RefactoringKind.RENAME) {
-    return new RenameOptions.fromJson(jsonDecoder, jsonPath, json);
-  }
-  return null;
-}
-
-/**
- * Type of callbacks used to decode parts of JSON objects.  [jsonPath] is a
- * string describing the part of the JSON object being decoded, and [value] is
- * the part to decode.
- */
-typedef Object JsonDecoderCallback(String jsonPath, Object value);
-
-/**
- * Instances of the class [DomainHandler] implement a [RequestHandler] and
- * also startup and shutdown methods.
- */
-abstract class DomainHandler extends RequestHandler {
-  /**
-   * Perform any operations associated with the shutdown of the domain. It is
-   * not guaranteed that this method will be called. If it is, it will be
-   * called after the last [Request] has been made.
-   */
-  void shutdown() {}
-
-  /**
-   * Perform any operations associated with the startup of the domain. This
-   * will be called before the first [Request].
-   */
-  void startup() {}
-}
-
-/**
- * Classes implementing [Enum] represent enumerated types in the protocol.
- */
-abstract class Enum {
-  /**
-   * The name of the enumerated value.  This should match the name of the
-   * static getter which provides access to this enumerated value.
-   */
-  String get name;
-}
-
-/**
- * Instances of the class [HasToJson] implement [toJson] method that returns
- * a JSON presentation.
- */
-abstract class HasToJson {
-  /**
-   * Returns a JSON presentation of the object.
-   */
-  Map<String, Object> toJson();
-}
-
-/**
- * Base class for decoding JSON objects.  The derived class must implement
- * error reporting logic.
- */
-abstract class JsonDecoder {
-  /**
-   * Retrieve the RefactoringKind that should be assumed when decoding
-   * refactoring feedback objects, or null if no refactoring feedback object is
-   * expected to be encountered.
-   */
-  RefactoringKind get refactoringKind;
-
-  /**
-   * Create an exception to throw if the JSON object at [jsonPath] fails to
-   * match the API definition of [expected].
-   */
-  dynamic mismatch(String jsonPath, String expected, [Object actual]);
-
-  /**
-   * Create an exception to throw if the JSON object at [jsonPath] is missing
-   * the key [key].
-   */
-  dynamic missingKey(String jsonPath, String key);
-
-  /**
-   * Decode a JSON object that is expected to be a boolean.  The strings "true"
-   * and "false" are also accepted.
-   */
-  bool _decodeBool(String jsonPath, Object json) {
-    if (json is bool) {
-      return json;
-    } else if (json == 'true') {
-      return true;
-    } else if (json == 'false') {
-      return false;
-    }
-    throw mismatch(jsonPath, 'bool', json);
-  }
-
-  /**
-   * Decode a JSON object that is expected to be an integer.  A string
-   * representation of an integer is also accepted.
-   */
-  int _decodeInt(String jsonPath, Object json) {
-    if (json is int) {
-      return json;
-    } else if (json is String) {
-      return int.parse(json, onError: (String value) {
-        throw mismatch(jsonPath, 'int', json);
-      });
-    }
-    throw mismatch(jsonPath, 'int', json);
-  }
-
-  /**
-   * Decode a JSON object that is expected to be a List.  [decoder] is used to
-   * decode the items in the list.
-   */
-  List _decodeList(String jsonPath, Object json,
-      [JsonDecoderCallback decoder]) {
-    if (json == null) {
-      return [];
-    } else if (json is List) {
-      List result = [];
-      for (int i = 0; i < json.length; i++) {
-        result.add(decoder('$jsonPath[$i]', json[i]));
-      }
-      return result;
-    } else {
-      throw mismatch(jsonPath, 'List', json);
-    }
-  }
-
-  /**
-   * Decode a JSON object that is expected to be a Map.  [keyDecoder] is used
-   * to decode the keys, and [valueDecoder] is used to decode the values.
-   */
-  Map _decodeMap(String jsonPath, Object json,
-      {JsonDecoderCallback keyDecoder, JsonDecoderCallback valueDecoder}) {
-    if (json == null) {
-      return {};
-    } else if (json is Map) {
-      Map result = {};
-      json.forEach((String key, value) {
-        Object decodedKey;
-        if (keyDecoder != null) {
-          decodedKey = keyDecoder('$jsonPath.key', key);
-        } else {
-          decodedKey = key;
-        }
-        if (valueDecoder != null) {
-          value = valueDecoder('$jsonPath[${JSON.encode(key)}]', value);
-        }
-        result[decodedKey] = value;
-      });
-      return result;
-    } else {
-      throw mismatch(jsonPath, 'Map', json);
-    }
-  }
-
-  /**
-   * Decode a JSON object that is expected to be a string.
-   */
-  String _decodeString(String jsonPath, Object json) {
-    if (json is String) {
-      return json;
-    } else {
-      throw mismatch(jsonPath, 'String', json);
-    }
-  }
-
-  /**
-   * Decode a JSON object that is expected to be one of several choices,
-   * where the choices are disambiguated by the contents of the field [field].
-   * [decoders] is a map from each possible string in the field to the decoder
-   * that should be used to decode the JSON object.
-   */
-  Object _decodeUnion(String jsonPath, Map json, String field,
-      Map<String, JsonDecoderCallback> decoders) {
-    if (json is Map) {
-      if (!json.containsKey(field)) {
-        throw missingKey(jsonPath, field);
-      }
-      var disambiguatorPath = '$jsonPath[${JSON.encode(field)}]';
-      String disambiguator = _decodeString(disambiguatorPath, json[field]);
-      if (!decoders.containsKey(disambiguator)) {
-        throw mismatch(
-            disambiguatorPath, 'One of: ${decoders.keys.toList()}', json);
-      }
-      return decoders[disambiguator](jsonPath, json);
-    } else {
-      throw mismatch(jsonPath, 'Map', json);
-    }
-  }
-}
-
-/**
- * Instances of the class [Notification] represent a notification from the
- * server about an event that occurred.
- */
-class Notification {
-  /**
-   * The name of the JSON attribute containing the name of the event that
-   * triggered the notification.
-   */
-  static const String EVENT = 'event';
-
-  /**
-   * The name of the JSON attribute containing the result values.
-   */
-  static const String PARAMS = 'params';
-
-  /**
-   * The name of the event that triggered the notification.
-   */
-  final String event;
-
-  /**
-   * A table mapping the names of notification parameters to their values, or
-   * null if there are no notification parameters.
-   */
-  Map<String, Object> _params;
-
-  /**
-   * Initialize a newly created [Notification] to have the given [event] name.
-   * If [_params] is provided, it will be used as the params; otherwise no
-   * params will be used.
-   */
-  Notification(this.event, [this._params]);
-
-  /**
-   * Initialize a newly created instance based upon the given JSON data
-   */
-  factory Notification.fromJson(Map<String, Object> json) {
-    return new Notification(
-        json[Notification.EVENT], json[Notification.PARAMS]);
-  }
-
-  /**
-   * Return a table representing the structure of the Json object that will be
-   * sent to the client to represent this response.
-   */
-  Map<String, Object> toJson() {
-    Map<String, Object> jsonObject = {};
-    jsonObject[EVENT] = event;
-    if (_params != null) {
-      jsonObject[PARAMS] = _params;
-    }
-    return jsonObject;
-  }
-}
-
-/**
- * Instances of the class [Request] represent a request that was received.
- */
-class Request {
-  /**
-   * The name of the JSON attribute containing the id of the request.
-   */
-  static const String ID = 'id';
-
-  /**
-   * The name of the JSON attribute containing the name of the request.
-   */
-  static const String METHOD = 'method';
-
-  /**
-   * The name of the JSON attribute containing the request parameters.
-   */
-  static const String PARAMS = 'params';
-
-  /**
-   * The name of the optional JSON attribute indicating the time
-   * (milliseconds since epoch) at which the client made the request.
-   */
-  static const String CLIENT_REQUEST_TIME = 'clientRequestTime';
-
-  /**
-   * The unique identifier used to identify this request.
-   */
-  final String id;
-
-  /**
-   * The method being requested.
-   */
-  final String method;
-
-  /**
-   * A table mapping the names of request parameters to their values.
-   */
-  final Map<String, Object> _params;
-
-  /**
-   * The time (milliseconds since epoch) at which the client made the request
-   * or `null` if this information is not provided by the client.
-   */
-  final int clientRequestTime;
-
-  /**
-   * Initialize a newly created [Request] to have the given [id] and [method]
-   * name.  If [params] is supplied, it is used as the "params" map for the
-   * request.  Otherwise an empty "params" map is allocated.
-   */
-  Request(this.id, this.method,
-      [Map<String, Object> params, this.clientRequestTime])
-      : _params = params != null ? params : new HashMap<String, Object>();
-
-  /**
-   * Return a request parsed from the given json, or `null` if the [data] is
-   * not a valid json representation of a request. The [data] is expected to
-   * have the following format:
-   *
-   *   {
-   *     'clientRequestTime': millisecondsSinceEpoch
-   *     'id': String,
-   *     'method': methodName,
-   *     'params': {
-   *       paramter_name: value
-   *     }
-   *   }
-   *
-   * where both the parameters and clientRequestTime are optional.
-   * The parameters can contain any number of name/value pairs.
-   * The clientRequestTime must be an int representing the time at which
-   * the client issued the request (milliseconds since epoch).
-   */
-  factory Request.fromJson(Map<String, dynamic> result) {
-    var id = result[Request.ID];
-    var method = result[Request.METHOD];
-    if (id is! String || method is! String) {
-      return null;
-    }
-    var time = result[Request.CLIENT_REQUEST_TIME];
-    if (time != null && time is! int) {
-      return null;
-    }
-    var params = result[Request.PARAMS];
-    if (params is Map || params == null) {
-      return new Request(id, method, params, time);
-    } else {
-      return null;
-    }
-  }
-
-  /**
-   * Return a request parsed from the given [data], or `null` if the [data] is
-   * not a valid json representation of a request. The [data] is expected to
-   * have the following format:
-   *
-   *   {
-   *     'clientRequestTime': millisecondsSinceEpoch
-   *     'id': String,
-   *     'method': methodName,
-   *     'params': {
-   *       paramter_name: value
-   *     }
-   *   }
-   *
-   * where both the parameters and clientRequestTime are optional.
-   * The parameters can contain any number of name/value pairs.
-   * The clientRequestTime must be an int representing the time at which
-   * the client issued the request (milliseconds since epoch).
-   */
-  factory Request.fromString(String data) {
-    try {
-      var result = JSON.decode(data);
-      if (result is Map) {
-        return new Request.fromJson(result);
-      }
-      return null;
-    } catch (exception) {
-      return null;
-    }
-  }
-
-  /**
-   * Return a table representing the structure of the Json object that will be
-   * sent to the client to represent this response.
-   */
-  Map<String, Object> toJson() {
-    Map<String, Object> jsonObject = new HashMap<String, Object>();
-    jsonObject[ID] = id;
-    jsonObject[METHOD] = method;
-    if (_params.isNotEmpty) {
-      jsonObject[PARAMS] = _params;
-    }
-    if (clientRequestTime != null) {
-      jsonObject[CLIENT_REQUEST_TIME] = clientRequestTime;
-    }
-    return jsonObject;
-  }
-}
-
-/**
- * JsonDecoder for decoding requests.  Errors are reporting by throwing a
- * [RequestFailure].
- */
-class RequestDecoder extends JsonDecoder {
-  /**
-   * The request being deserialized.
-   */
-  final Request _request;
-
-  RequestDecoder(this._request);
-
-  RefactoringKind get refactoringKind {
-    // Refactoring feedback objects should never appear in requests.
-    return null;
-  }
-
-  @override
-  dynamic mismatch(String jsonPath, String expected, [Object actual]) {
-    StringBuffer buffer = new StringBuffer();
-    buffer.write('Expected to be ');
-    buffer.write(expected);
-    if (actual != null) {
-      buffer.write('; found "');
-      buffer.write(JSON.encode(actual));
-      buffer.write('"');
-    }
-    return new RequestFailure(
-        new Response.invalidParameter(_request, jsonPath, buffer.toString()));
-  }
-
-  @override
-  dynamic missingKey(String jsonPath, String key) {
-    return new RequestFailure(new Response.invalidParameter(
-        _request, jsonPath, 'Expected to contain key ${JSON.encode(key)}'));
-  }
-}
-
-/**
- * Instances of the class [RequestFailure] represent an exception that occurred
- * during the handling of a request that requires that an error be returned to
- * the client.
- */
-class RequestFailure implements Exception {
-  /**
-   * The response to be returned as a result of the failure.
-   */
-  final Response response;
-
-  /**
-   * Initialize a newly created exception to return the given reponse.
-   */
-  RequestFailure(this.response);
-}
-
-/**
- * Instances of the class [RequestHandler] implement a handler that can handle
- * requests and produce responses for them.
- */
-abstract class RequestHandler {
-  /**
-   * Attempt to handle the given [request]. If the request is not recognized by
-   * this handler, return `null` so that other handlers will be given a chance
-   * to handle it. Otherwise, return the response that should be passed back to
-   * the client.
-   */
-  Response handleRequest(Request request);
-}
-
-/**
- * Instances of the class [Response] represent a response to a request.
- */
-class Response {
-  /**
-   * The [Response] instance that is returned when a real [Response] cannot
-   * be provided at the moment.
-   */
-  static final Response DELAYED_RESPONSE = new Response('DELAYED_RESPONSE');
-
-  /**
-   * The name of the JSON attribute containing the id of the request for which
-   * this is a response.
-   */
-  static const String ID = 'id';
-
-  /**
-   * The name of the JSON attribute containing the error message.
-   */
-  static const String ERROR = 'error';
-
-  /**
-   * The name of the JSON attribute containing the result values.
-   */
-  static const String RESULT = 'result';
-
-  /**
-   * The unique identifier used to identify the request that this response is
-   * associated with.
-   */
-  final String id;
-
-  /**
-   * The error that was caused by attempting to handle the request, or `null` if
-   * there was no error.
-   */
-  final RequestError error;
-
-  /**
-   * A table mapping the names of result fields to their values.  Should be
-   * null if there is no result to send.
-   */
-  Map<String, Object> _result;
-
-  /**
-   * Initialize a newly created instance to represent a response to a request
-   * with the given [id].  If [_result] is provided, it will be used as the
-   * result; otherwise an empty result will be used.  If an [error] is provided
-   * then the response will represent an error condition.
-   */
-  Response(this.id, {Map<String, Object> result, this.error})
-      : _result = result;
-
-  /**
-   * Initialize a newly created instance to represent the
-   * FILE_NOT_ANALYZED error condition.
-   */
-  Response.fileNotAnalyzed(Request request, String file)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.FILE_NOT_ANALYZED,
-                'File is not analyzed: $file.'));
-
-  /**
-   * Initialize a newly created instance to represent the FORMAT_INVALID_FILE
-   * error condition.
-   */
-  Response.formatInvalidFile(Request request)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.FORMAT_INVALID_FILE,
-                'Error during `edit.format`: invalid file.'));
-
-  /**
-   * Initialize a newly created instance to represent the FORMAT_WITH_ERROR
-   * error condition.
-   */
-  Response.formatWithErrors(Request request)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.FORMAT_WITH_ERRORS,
-                'Error during `edit.format`: source contains syntax errors.'));
-
-  /**
-   * Initialize a newly created instance based upon the given JSON data
-   */
-  factory Response.fromJson(Map<String, Object> json) {
-    try {
-      Object id = json[Response.ID];
-      if (id is! String) {
-        return null;
-      }
-      Object error = json[Response.ERROR];
-      RequestError decodedError;
-      if (error is Map) {
-        decodedError = new RequestError.fromJson(
-            new ResponseDecoder(null), '.error', error);
-      }
-      Object result = json[Response.RESULT];
-      Map<String, Object> decodedResult;
-      if (result is Map) {
-        decodedResult = result;
-      }
-      return new Response(id, error: decodedError, result: decodedResult);
-    } catch (exception) {
-      return null;
-    }
-  }
-
-  /**
-   * Initialize a newly created instance to represent the
-   * GET_ERRORS_INVALID_FILE error condition.
-   */
-  Response.getErrorsInvalidFile(Request request)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.GET_ERRORS_INVALID_FILE,
-                'Error during `analysis.getErrors`: invalid file.'));
-
-  /**
-   * Initialize a newly created instance to represent the
-   * GET_NAVIGATION_INVALID_FILE error condition.
-   */
-  Response.getNavigationInvalidFile(Request request)
-      : this(request.id,
-            error: new RequestError(
-                RequestErrorCode.GET_NAVIGATION_INVALID_FILE,
-                'Error during `analysis.getNavigation`: invalid file.'));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by an analysis.reanalyze [request] that specifies an analysis root that is
-   * not in the current list of analysis roots.
-   */
-  Response.invalidAnalysisRoot(Request request, String rootPath)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.INVALID_ANALYSIS_ROOT,
-                "Invalid analysis root: $rootPath"));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by a [request] that specifies an execution context whose context root does
-   * not exist.
-   */
-  Response.invalidExecutionContext(Request request, String contextId)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.INVALID_EXECUTION_CONTEXT,
-                "Invalid execution context: $contextId"));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by a [request] that had invalid parameter.  [path] is the path to the
-   * invalid parameter, in Javascript notation (e.g. "foo.bar" means that the
-   * parameter "foo" contained a key "bar" whose value was the wrong type).
-   * [expectation] is a description of the type of data that was expected.
-   */
-  Response.invalidParameter(Request request, String path, String expectation)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.INVALID_PARAMETER,
-                "Invalid parameter '$path'. $expectation."));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by a malformed request.
-   */
-  Response.invalidRequestFormat()
-      : this('',
-            error: new RequestError(
-                RequestErrorCode.INVALID_REQUEST, 'Invalid request'));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by a request that requires an index, but indexing is disabled.
-   */
-  Response.noIndexGenerated(Request request)
-      : this(request.id,
-            error: new RequestError(
-                RequestErrorCode.NO_INDEX_GENERATED, 'Indexing is disabled'));
-
-  /**
-   * Initialize a newly created instance to represent the
-   * ORGANIZE_DIRECTIVES_ERROR error condition.
-   */
-  Response.organizeDirectivesError(Request request, String message)
-      : this(request.id,
-            error: new RequestError(
-                RequestErrorCode.ORGANIZE_DIRECTIVES_ERROR, message));
-
-  /**
-   * Initialize a newly created instance to represent the
-   * REFACTORING_REQUEST_CANCELLED error condition.
-   */
-  Response.refactoringRequestCancelled(Request request)
-      : this(request.id,
-            error: new RequestError(
-                RequestErrorCode.REFACTORING_REQUEST_CANCELLED,
-                'The `edit.getRefactoring` request was cancelled.'));
-
-  /**
-   * Initialize a newly created instance to represent the SERVER_ERROR error
-   * condition.
-   */
-  factory Response.serverError(Request request, exception, stackTrace) {
-    RequestError error =
-        new RequestError(RequestErrorCode.SERVER_ERROR, exception.toString());
-    if (stackTrace != null) {
-      error.stackTrace = stackTrace.toString();
-    }
-    return new Response(request.id, error: error);
-  }
-
-  /**
-   * Initialize a newly created instance to represent the
-   * SORT_MEMBERS_INVALID_FILE error condition.
-   */
-  Response.sortMembersInvalidFile(Request request)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.SORT_MEMBERS_INVALID_FILE,
-                'Error during `edit.sortMembers`: invalid file.'));
-
-  /**
-   * Initialize a newly created instance to represent the
-   * SORT_MEMBERS_PARSE_ERRORS error condition.
-   */
-  Response.sortMembersParseErrors(Request request, int numErrors)
-      : this(request.id,
-            error: new RequestError(RequestErrorCode.SORT_MEMBERS_PARSE_ERRORS,
-                'Error during `edit.sortMembers`: file has $numErrors scan/parse errors.'));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by a `analysis.setPriorityFiles` [request] that includes one or more files
-   * that are not being analyzed.
-   */
-  Response.unanalyzedPriorityFiles(String requestId, String fileNames)
-      : this(requestId,
-            error: new RequestError(RequestErrorCode.UNANALYZED_PRIORITY_FILES,
-                "Unanalyzed files cannot be a priority: '$fileNames'"));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by a [request] that cannot be handled by any known handlers.
-   */
-  Response.unknownRequest(Request request)
-      : this(request.id,
-            error: new RequestError(
-                RequestErrorCode.UNKNOWN_REQUEST, 'Unknown request'));
-
-  /**
-   * Initialize a newly created instance to represent an error condition caused
-   * by a [request] referencing a source that does not exist.
-   */
-  Response.unknownSource(Request request)
-      : this(request.id,
-            error: new RequestError(
-                RequestErrorCode.UNKNOWN_SOURCE, 'Unknown source'));
-
-  Response.unsupportedFeature(String requestId, String message)
-      : this(requestId,
-            error: new RequestError(
-                RequestErrorCode.UNSUPPORTED_FEATURE, message));
-
-  /**
-   * Return a table representing the structure of the Json object that will be
-   * sent to the client to represent this response.
-   */
-  Map<String, Object> toJson() {
-    Map<String, Object> jsonObject = new HashMap<String, Object>();
-    jsonObject[ID] = id;
-    if (error != null) {
-      jsonObject[ERROR] = error.toJson();
-    }
-    if (_result != null) {
-      jsonObject[RESULT] = _result;
-    }
-    return jsonObject;
-  }
-}
-
-/**
- * JsonDecoder for decoding responses from the server.  This is intended to be
- * used only for testing.  Errors are reported using bare [Exception] objects.
- */
-class ResponseDecoder extends JsonDecoder {
-  final RefactoringKind refactoringKind;
-
-  ResponseDecoder(this.refactoringKind);
-
-  @override
-  dynamic mismatch(String jsonPath, String expected, [Object actual]) {
-    StringBuffer buffer = new StringBuffer();
-    buffer.write('Expected ');
-    buffer.write(expected);
-    if (actual != null) {
-      buffer.write(' found "');
-      buffer.write(JSON.encode(actual));
-      buffer.write('"');
-    }
-    buffer.write(' at ');
-    buffer.write(jsonPath);
-    return new Exception(buffer.toString());
-  }
-
-  @override
-  dynamic missingKey(String jsonPath, String key) {
-    return new Exception('Missing key $key at $jsonPath');
-  }
-}
-
-/**
- * Jenkins hash function, optimized for small integers.  Borrowed from
- * sdk/lib/math/jenkins_smi_hash.dart.
- *
- * TODO(paulberry): Move to somewhere that can be shared with other code.
- */
-class _JenkinsSmiHash {
-  static int combine(int hash, int value) {
-    hash = 0x1fffffff & (hash + value);
-    hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10));
-    return hash ^ (hash >> 6);
-  }
-
-  static int finish(int hash) {
-    hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
-    hash = hash ^ (hash >> 11);
-    return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
-  }
-
-  static int hash2(a, b) => finish(combine(combine(0, a), b));
-
-  static int hash4(a, b, c, d) =>
-      finish(combine(combine(combine(combine(0, a), b), c), d));
-}