pkg/dartdev/lib/src/analysis_server.dart - sdk.git - Git at Google

 // Copyright (c) 2020, 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.

 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';

 import 'package:analysis_server/src/server/driver.dart' show Driver;
 import 'package:analysis_server_client/protocol.dart'
     show
         AddContentOverlay,
         AnalysisUpdateContentParams,
         EditBulkFixesResult,
         ResponseDecoder;
 import 'package:args/args.dart';
 import 'package:path/path.dart' as path;

 import 'core.dart';
 import 'experiments.dart';
 import 'sdk.dart';
 import 'utils.dart';

 /// When set, this function is executed just before the Analysis Server starts.
 void Function(String cmdName, List<FileSystemEntity> analysisRoots,
     ArgResults? argResults)? preAnalysisServerStart;

 /// A class to provide an API wrapper around an analysis server process.
 class AnalysisServer {
   AnalysisServer(
     this.packagesFile,
     this.sdkPath,
     this.analysisRoots, {
     this.cacheDirectoryPath,
     required this.commandName,
     required this.argResults,
     this.enabledExperiments = const [],
     this.disableStatusNotificationDebouncing = false,
     this.suppressAnalytics = false,
   });

   final String? cacheDirectoryPath;
   final File? packagesFile;
   final Directory sdkPath;
   final List<FileSystemEntity> analysisRoots;
   final String commandName;
   final ArgResults? argResults;
   final List<String> enabledExperiments;
   final bool disableStatusNotificationDebouncing;
   final bool suppressAnalytics;

   Process? _process;

   /// When not null, this is a [Completer] which completes when analysis has
   /// finished, otherwise `null`.
   Completer<bool>? _analysisFinished;

   int _id = 0;

   bool _shutdownResponseReceived = false;

   bool _serverErrorReceived = false;

   /// Whether any server error occurred that could mean analysis was not
   /// performed correctly.
   bool get serverErrorReceived => _serverErrorReceived;

   Stream<bool> get onAnalyzing {
     // {"event":"server.status","params":{"analysis":{"isAnalyzing":true}}}
     return _streamController('server.status')
         .stream
         .where((event) => event!['analysis'] != null)
         .map((event) => (event!['analysis']['isAnalyzing']!) as bool);
   }

   /// This future completes when we next receive an analysis finished event
   /// (unless there's no current analysis and we've already received a complete
   /// event, in which case this future completes immediately).
   Future<bool>? get analysisFinished => _analysisFinished?.future;

   Stream<FileAnalysisErrors> get onErrors {
     // {"event":"analysis.errors","params":{"file":"/Users/.../lib/main.dart","errors":[]}}
     return _streamController('analysis.errors').stream.map((event) {
       final file = event!['file'] as String;
       final errorsList = event['errors'] as List<dynamic>;
       final errors = errorsList
           .map<Map<String, dynamic>>(castStringKeyedMap)
           .map<AnalysisError>(
               (Map<String, dynamic> json) => AnalysisError(json))
           .toList();
       return FileAnalysisErrors(file, errors);
     });
   }

   Future<int> get onExit => _process!.exitCode;

   final Map<String, StreamController<Map<String, dynamic>>> _streamControllers =
       {};

   /// Completes when an analysis server crash has been detected.
   Future<void> get onCrash => _onCrash.future;

   final _onCrash = Completer<void>();

   final Map<String, Completer<Map<String, dynamic>>> _requestCompleters = {};

   /// Starts the process and returns the pid for it.
   Future<int> start({bool setAnalysisRoots = true}) async {
     preAnalysisServerStart?.call(commandName, analysisRoots, argResults);
     final command = [
       sdk.analysisServerSnapshot,
       if (suppressAnalytics) '--${Driver.SUPPRESS_ANALYTICS_FLAG}',
       '--${Driver.CLIENT_ID}=dart-$commandName',
       '--disable-server-feature-completion',
       '--disable-server-feature-search',
       if (disableStatusNotificationDebouncing)
         '--disable-status-notification-debouncing',
       '--disable-silent-analysis-exceptions',
       '--sdk',
       sdkPath.path,
       if (cacheDirectoryPath != null) '--cache=$cacheDirectoryPath',
       if (packagesFile != null) '--packages=${packagesFile!.path}',
       if (enabledExperiments.isNotEmpty)
         '--$experimentFlagName=${enabledExperiments.join(',')}'
     ];

     final process = await startDartProcess(sdk, command);
     _process = process;
     _shutdownResponseReceived = false;
     // This callback hookup can't throw.
     process.exitCode.whenComplete(() {
       _process = null;

       if (!_shutdownResponseReceived) {
         // The process exited unexpectedly. Report the crash.
         // If `server.error` reported an error, that has been logged by
         // `_handleServerError`.

         final error = StateError('The analysis server crashed unexpectedly');

         final analysisFinished = _analysisFinished;
         if (analysisFinished != null && !analysisFinished.isCompleted) {
           // Complete this completer in order to unstick the process.
           analysisFinished.completeError(error);
         }

         // Complete these completers in order to unstick the process.
         for (final completer in _requestCompleters.values) {
           completer.completeError(error);
         }

         _onCrash.complete();
       }
     });

     final errorStream = process.stderr
         .transform<String>(utf8.decoder)
         .transform<String>(const LineSplitter());
     errorStream.listen(log.stderr);

     final inStream = process.stdout
         .transform<String>(utf8.decoder)
         .transform<String>(const LineSplitter());
     inStream.listen(_handleServerResponse);

     _streamController('server.error').stream.listen(_handleServerError);

     _sendCommand('server.setSubscriptions', params: <String, dynamic>{
       'subscriptions': <String>['STATUS'],
     });

     // Reference and trim off any trailing slash, the Dart Analysis Server
     // protocol throws an error (INVALID_FILE_PATH_FORMAT) if there is a
     // trailing slash.
     //
     // The call to `absolute.resolveSymbolicLinksSync()` canonicalizes the path
     // to be passed to the analysis server.
     final analysisRootPaths = [
       for (final root in analysisRoots)
         trimEnd(
             root.absolute.resolveSymbolicLinksSync(), path.context.separator),
     ];

     onAnalyzing.listen((isAnalyzing) {
       final analysisFinished = _analysisFinished;
       if (isAnalyzing && (analysisFinished?.isCompleted ?? true)) {
         // Start a new completer, to be completed when we receive the
         // corresponding analysis complete event.
         _analysisFinished = Completer();
       } else if (!isAnalyzing &&
           analysisFinished != null &&
           !analysisFinished.isCompleted) {
         analysisFinished.complete(true);
       }
     });

     if (setAnalysisRoots) {
       await _sendCommand('analysis.setAnalysisRoots', params: {
         'included': analysisRootPaths,
         'excluded': [],
       });
     }

     return process.pid;
   }

   Future<String> getVersion() {
     return _sendCommand('server.getVersion')
         .then((response) => response['version']);
   }

   Future<EditBulkFixesResult> requestBulkFixes(
       String filePath, bool inTestMode, List<String> codes,
       {bool updatePubspec = false}) {
     return _sendCommand('edit.bulkFixes', params: <String, dynamic>{
       'included': [path.canonicalize(filePath)],
       'inTestMode': inTestMode,
       'updatePubspec': updatePubspec,
       if (codes.isNotEmpty) 'codes': codes,
     }).then((result) {
       return EditBulkFixesResult.fromJson(
           ResponseDecoder(null), 'result', result);
     });
   }

   Future<void> shutdown({Duration? timeout}) async {
     // Request shutdown.
     final Future<void> future =
         _sendCommand('server.shutdown').then((Map<String, dynamic> value) {
       _shutdownResponseReceived = true;
       return;
     });
     await (timeout != null
             ? future.timeout(timeout, onTimeout: () {
                 log.stderr(
                     'The analysis server timed out while shutting down.');
               })
             : future)
         .whenComplete(dispose);
   }

   /// Send an `analysis.updateContent` request with the given [files].
   Future<void> updateContent(Map<String, AddContentOverlay> files) async {
     await _sendCommand('analysis.updateContent',
         params: AnalysisUpdateContentParams(files).toJson());
   }

   Future<Map<String, dynamic>> _sendCommand(String method,
       {Map<String, dynamic>? params}) {
     final String id = (++_id).toString();
     final String message = json.encode(<String, dynamic>{
       'id': id,
       'method': method,
       'params': params,
     });

     final Completer<Map<String, dynamic>> completer = Completer();

     _requestCompleters[id] = completer;
     _process!.stdin.writeln(message);

     log.trace('==> $message');

     return completer.future;
   }

   void _handleServerResponse(String line) {
     log.trace('<== $line');

     final dynamic response = json.decode(line);

     if (response is Map<String, dynamic>) {
       if (response['event'] != null) {
         final event = response['event'] as String;
         final dynamic params = response['params'];

         if (params is Map<String, dynamic>) {
           _streamController(event).add(castStringKeyedMap(params));
         }
       } else if (response['id'] != null) {
         final id = response['id'];

         if (response['error'] != null) {
           final error = castStringKeyedMap(response['error']);
           _requestCompleters
               .remove(id)
               ?.completeError(RequestError.parse(error));
         } else {
           _requestCompleters.remove(id)?.complete(response['result'] ?? {});
         }
       }
     }
   }

   void _handleServerError(Map<String, dynamic>? error) {
     _serverErrorReceived = true;
     final err = error!;
     log.stderr('An unexpected error was encountered by the Analysis Server.');
     log.stderr('Please file an issue at '
         'https://github.com/dart-lang/sdk/issues/new/choose with the following '
         'details:\n');
     // Fields are 'isFatal', 'message', and 'stackTrace'.
     log.stderr(err['message']);
     if (err['stackTrace'] != null) {
       log.stderr(err['stackTrace'] as String);
     }
   }

   StreamController<Map<String, dynamic>?> _streamController(String streamId) {
     return _streamControllers.putIfAbsent(
         streamId, () => StreamController<Map<String, dynamic>>.broadcast());
   }

   Future<bool> dispose() async {
     return _process?.kill() ?? true;
   }
 }

 enum _AnalysisSeverity {
   error,
   warning,
   info,
   none,
 }

 class AnalysisError implements Comparable<AnalysisError> {
   AnalysisError(this.json);

   static final Map<String, _AnalysisSeverity> _severityMap =
       <String, _AnalysisSeverity>{
     'INFO': _AnalysisSeverity.info,
     'WARNING': _AnalysisSeverity.warning,
     'ERROR': _AnalysisSeverity.error,
   };

   // "severity":"INFO","type":"TODO","location":{
   //   "file":"/Users/.../lib/test.dart","offset":362,"length":72,"startLine":15,"startColumn":4
   // },"message":"...","hasFix":false}
   Map<String, dynamic> json;

   String? get severity => json['severity'] as String?;

   _AnalysisSeverity get _severityLevel =>
       _severityMap[severity!] ?? _AnalysisSeverity.none;

   bool get isInfo => _severityLevel == _AnalysisSeverity.info;

   bool get isWarning => _severityLevel == _AnalysisSeverity.warning;

   bool get isError => _severityLevel == _AnalysisSeverity.error;

   String get type => json['type'] as String;

   String get message => json['message'] as String;

   String get code => json['code'] as String;

   String? get correction => json['correction'] as String?;

   int? get endColumn => json['location']['endColumn'] as int?;

   int? get endLine => json['location']['endLine'] as int?;

   String get file => json['location']['file'] as String;

   int? get startLine => json['location']['startLine'] as int?;

   int? get startColumn => json['location']['startColumn'] as int?;

   int get offset => json['location']['offset'] as int;

   int get length => json['location']['length'] as int;

   String? get url => json['url'] as String?;

   List<DiagnosticMessage> get contextMessages {
     var messages = json['contextMessages'] as List<dynamic>?;
     if (messages == null) {
       // The field is optional, so we return an empty list as a default value.
       return [];
     }
     return messages.map((message) => DiagnosticMessage(message)).toList();
   }

   @override
   int compareTo(AnalysisError other) {
     // Sort in order of severity, file path, error location, and message.
     final int diff = _severityLevel.index - other._severityLevel.index;
     if (diff != 0) {
       return diff;
     }

     if (file != other.file) {
       return file.compareTo(other.file);
     }

     if (offset != other.offset) {
       return offset - other.offset;
     }

     return message.compareTo(other.message);
   }

   @override
   String toString() => '${severity!.toLowerCase()} • '
       '$message • $file:$startLine:$startColumn • '
       '($code)';
 }

 class DiagnosticMessage {
   final Map<String, dynamic> json;

   DiagnosticMessage(this.json);

   int? get column => json['location']['startColumn'] as int?;

   int? get endColumn => json['location']['endColumn'] as int?;

   int? get endLine => json['location']['endLine'] as int?;

   String get filePath => json['location']['file'] as String;

   int get length => json['location']['length'] as int;

   int get line => json['location']['startLine'] as int;

   String get message => json['message'] as String;

   int get offset => json['location']['offset'] as int;
 }

 class FileAnalysisErrors {
   final String file;
   final List<AnalysisError> errors;

   FileAnalysisErrors(this.file, this.errors);
 }

 class RequestError {
   static RequestError parse(dynamic error) {
     return RequestError(
       error['code'],
       error['message'],
       stackTrace: error['stackTrace'],
     );
   }

   final String code;
   final String message;
   final String stackTrace;

   RequestError(this.code, this.message, {required this.stackTrace});

   @override
   String toString() => '[RequestError code: $code, message: $message]';
 }
	// Copyright (c) 2020, 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.

	import 'dart:async';
	import 'dart:convert';
	import 'dart:io';

	import 'package:analysis_server/src/server/driver.dart' show Driver;
	import 'package:analysis_server_client/protocol.dart'
	show
	AddContentOverlay,
	AnalysisUpdateContentParams,
	EditBulkFixesResult,
	ResponseDecoder;
	import 'package:args/args.dart';
	import 'package:path/path.dart' as path;

	import 'core.dart';
	import 'experiments.dart';
	import 'sdk.dart';
	import 'utils.dart';

	/// When set, this function is executed just before the Analysis Server starts.
	void Function(String cmdName, List<FileSystemEntity> analysisRoots,
	ArgResults? argResults)? preAnalysisServerStart;

	/// A class to provide an API wrapper around an analysis server process.
	class AnalysisServer {
	AnalysisServer(
	this.packagesFile,
	this.sdkPath,
	this.analysisRoots, {
	this.cacheDirectoryPath,
	required this.commandName,
	required this.argResults,
	this.enabledExperiments = const [],
	this.disableStatusNotificationDebouncing = false,
	this.suppressAnalytics = false,
	});

	final String? cacheDirectoryPath;
	final File? packagesFile;
	final Directory sdkPath;
	final List<FileSystemEntity> analysisRoots;
	final String commandName;
	final ArgResults? argResults;
	final List<String> enabledExperiments;
	final bool disableStatusNotificationDebouncing;
	final bool suppressAnalytics;

	Process? _process;

	/// When not null, this is a [Completer] which completes when analysis has
	/// finished, otherwise `null`.
	Completer<bool>? _analysisFinished;

	int _id = 0;

	bool _shutdownResponseReceived = false;

	bool _serverErrorReceived = false;

	/// Whether any server error occurred that could mean analysis was not
	/// performed correctly.
	bool get serverErrorReceived => _serverErrorReceived;

	Stream<bool> get onAnalyzing {
	// {"event":"server.status","params":{"analysis":{"isAnalyzing":true}}}
	return _streamController('server.status')
	.stream
	.where((event) => event!['analysis'] != null)
	.map((event) => (event!['analysis']['isAnalyzing']!) as bool);
	}

	/// This future completes when we next receive an analysis finished event
	/// (unless there's no current analysis and we've already received a complete
	/// event, in which case this future completes immediately).
	Future<bool>? get analysisFinished => _analysisFinished?.future;

	Stream<FileAnalysisErrors> get onErrors {
	// {"event":"analysis.errors","params":{"file":"/Users/.../lib/main.dart","errors":[]}}
	return _streamController('analysis.errors').stream.map((event) {
	final file = event!['file'] as String;
	final errorsList = event['errors'] as List<dynamic>;
	final errors = errorsList
	.map<Map<String, dynamic>>(castStringKeyedMap)
	.map<AnalysisError>(
	(Map<String, dynamic> json) => AnalysisError(json))
	.toList();
	return FileAnalysisErrors(file, errors);
	});
	}

	Future<int> get onExit => _process!.exitCode;

	final Map<String, StreamController<Map<String, dynamic>>> _streamControllers =
	{};

	/// Completes when an analysis server crash has been detected.
	Future<void> get onCrash => _onCrash.future;

	final _onCrash = Completer<void>();

	final Map<String, Completer<Map<String, dynamic>>> _requestCompleters = {};

	/// Starts the process and returns the pid for it.
	Future<int> start({bool setAnalysisRoots = true}) async {
	preAnalysisServerStart?.call(commandName, analysisRoots, argResults);
	final command = [
	sdk.analysisServerSnapshot,
	if (suppressAnalytics) '--${Driver.SUPPRESS_ANALYTICS_FLAG}',
	'--${Driver.CLIENT_ID}=dart-$commandName',
	'--disable-server-feature-completion',
	'--disable-server-feature-search',
	if (disableStatusNotificationDebouncing)
	'--disable-status-notification-debouncing',
	'--disable-silent-analysis-exceptions',
	'--sdk',
	sdkPath.path,
	if (cacheDirectoryPath != null) '--cache=$cacheDirectoryPath',
	if (packagesFile != null) '--packages=${packagesFile!.path}',
	if (enabledExperiments.isNotEmpty)
	'--$experimentFlagName=${enabledExperiments.join(',')}'
	];

	final process = await startDartProcess(sdk, command);
	_process = process;
	_shutdownResponseReceived = false;
	// This callback hookup can't throw.
	process.exitCode.whenComplete(() {
	_process = null;

	if (!_shutdownResponseReceived) {
	// The process exited unexpectedly. Report the crash.
	// If `server.error` reported an error, that has been logged by
	// `_handleServerError`.

	final error = StateError('The analysis server crashed unexpectedly');

	final analysisFinished = _analysisFinished;
	if (analysisFinished != null && !analysisFinished.isCompleted) {
	// Complete this completer in order to unstick the process.
	analysisFinished.completeError(error);
	}

	// Complete these completers in order to unstick the process.
	for (final completer in _requestCompleters.values) {
	completer.completeError(error);
	}

	_onCrash.complete();
	}
	});

	final errorStream = process.stderr
	.transform<String>(utf8.decoder)
	.transform<String>(const LineSplitter());
	errorStream.listen(log.stderr);

	final inStream = process.stdout
	.transform<String>(utf8.decoder)
	.transform<String>(const LineSplitter());
	inStream.listen(_handleServerResponse);

	_streamController('server.error').stream.listen(_handleServerError);

	_sendCommand('server.setSubscriptions', params: <String, dynamic>{
	'subscriptions': <String>['STATUS'],
	});

	// Reference and trim off any trailing slash, the Dart Analysis Server
	// protocol throws an error (INVALID_FILE_PATH_FORMAT) if there is a
	// trailing slash.
	//
	// The call to `absolute.resolveSymbolicLinksSync()` canonicalizes the path
	// to be passed to the analysis server.
	final analysisRootPaths = [
	for (final root in analysisRoots)
	trimEnd(
	root.absolute.resolveSymbolicLinksSync(), path.context.separator),
	];

	onAnalyzing.listen((isAnalyzing) {
	final analysisFinished = _analysisFinished;
	if (isAnalyzing && (analysisFinished?.isCompleted ?? true)) {
	// Start a new completer, to be completed when we receive the
	// corresponding analysis complete event.
	_analysisFinished = Completer();
	} else if (!isAnalyzing &&
	analysisFinished != null &&
	!analysisFinished.isCompleted) {
	analysisFinished.complete(true);
	}
	});

	if (setAnalysisRoots) {
	await _sendCommand('analysis.setAnalysisRoots', params: {
	'included': analysisRootPaths,
	'excluded': [],
	});
	}

	return process.pid;
	}

	Future<String> getVersion() {
	return _sendCommand('server.getVersion')
	.then((response) => response['version']);
	}

	Future<EditBulkFixesResult> requestBulkFixes(
	String filePath, bool inTestMode, List<String> codes,
	{bool updatePubspec = false}) {
	return _sendCommand('edit.bulkFixes', params: <String, dynamic>{
	'included': [path.canonicalize(filePath)],
	'inTestMode': inTestMode,
	'updatePubspec': updatePubspec,
	if (codes.isNotEmpty) 'codes': codes,
	}).then((result) {
	return EditBulkFixesResult.fromJson(
	ResponseDecoder(null), 'result', result);
	});
	}

	Future<void> shutdown({Duration? timeout}) async {
	// Request shutdown.
	final Future<void> future =
	_sendCommand('server.shutdown').then((Map<String, dynamic> value) {
	_shutdownResponseReceived = true;
	return;
	});
	await (timeout != null
	? future.timeout(timeout, onTimeout: () {
	log.stderr(
	'The analysis server timed out while shutting down.');
	})
	: future)
	.whenComplete(dispose);
	}

	/// Send an `analysis.updateContent` request with the given [files].
	Future<void> updateContent(Map<String, AddContentOverlay> files) async {
	await _sendCommand('analysis.updateContent',
	params: AnalysisUpdateContentParams(files).toJson());
	}

	Future<Map<String, dynamic>> _sendCommand(String method,
	{Map<String, dynamic>? params}) {
	final String id = (++_id).toString();
	final String message = json.encode(<String, dynamic>{
	'id': id,
	'method': method,
	'params': params,
	});

	final Completer<Map<String, dynamic>> completer = Completer();

	_requestCompleters[id] = completer;
	_process!.stdin.writeln(message);

	log.trace('==> $message');

	return completer.future;
	}

	void _handleServerResponse(String line) {
	log.trace('<== $line');

	final dynamic response = json.decode(line);

	if (response is Map<String, dynamic>) {
	if (response['event'] != null) {
	final event = response['event'] as String;
	final dynamic params = response['params'];

	if (params is Map<String, dynamic>) {
	_streamController(event).add(castStringKeyedMap(params));
	}
	} else if (response['id'] != null) {
	final id = response['id'];

	if (response['error'] != null) {
	final error = castStringKeyedMap(response['error']);
	_requestCompleters
	.remove(id)
	?.completeError(RequestError.parse(error));
	} else {
	_requestCompleters.remove(id)?.complete(response['result'] ?? {});
	}
	}
	}
	}

	void _handleServerError(Map<String, dynamic>? error) {
	_serverErrorReceived = true;
	final err = error!;
	log.stderr('An unexpected error was encountered by the Analysis Server.');
	log.stderr('Please file an issue at '
	'https://github.com/dart-lang/sdk/issues/new/choose with the following '
	'details:\n');
	// Fields are 'isFatal', 'message', and 'stackTrace'.
	log.stderr(err['message']);
	if (err['stackTrace'] != null) {
	log.stderr(err['stackTrace'] as String);
	}
	}

	StreamController<Map<String, dynamic>?> _streamController(String streamId) {
	return _streamControllers.putIfAbsent(
	streamId, () => StreamController<Map<String, dynamic>>.broadcast());
	}

	Future<bool> dispose() async {
	return _process?.kill() ?? true;
	}
	}

	enum _AnalysisSeverity {
	error,
	warning,
	info,
	none,
	}

	class AnalysisError implements Comparable<AnalysisError> {
	AnalysisError(this.json);

	static final Map<String, _AnalysisSeverity> _severityMap =
	<String, _AnalysisSeverity>{
	'INFO': _AnalysisSeverity.info,
	'WARNING': _AnalysisSeverity.warning,
	'ERROR': _AnalysisSeverity.error,
	};

	// "severity":"INFO","type":"TODO","location":{
	// "file":"/Users/.../lib/test.dart","offset":362,"length":72,"startLine":15,"startColumn":4
	// },"message":"...","hasFix":false}
	Map<String, dynamic> json;

	String? get severity => json['severity'] as String?;

	_AnalysisSeverity get _severityLevel =>
	_severityMap[severity!] ?? _AnalysisSeverity.none;

	bool get isInfo => _severityLevel == _AnalysisSeverity.info;

	bool get isWarning => _severityLevel == _AnalysisSeverity.warning;

	bool get isError => _severityLevel == _AnalysisSeverity.error;

	String get type => json['type'] as String;

	String get message => json['message'] as String;

	String get code => json['code'] as String;

	String? get correction => json['correction'] as String?;

	int? get endColumn => json['location']['endColumn'] as int?;

	int? get endLine => json['location']['endLine'] as int?;

	String get file => json['location']['file'] as String;

	int? get startLine => json['location']['startLine'] as int?;

	int? get startColumn => json['location']['startColumn'] as int?;

	int get offset => json['location']['offset'] as int;

	int get length => json['location']['length'] as int;

	String? get url => json['url'] as String?;

	List<DiagnosticMessage> get contextMessages {
	var messages = json['contextMessages'] as List<dynamic>?;
	if (messages == null) {
	// The field is optional, so we return an empty list as a default value.
	return [];
	}
	return messages.map((message) => DiagnosticMessage(message)).toList();
	}

	@override
	int compareTo(AnalysisError other) {
	// Sort in order of severity, file path, error location, and message.
	final int diff = _severityLevel.index - other._severityLevel.index;
	if (diff != 0) {
	return diff;
	}

	if (file != other.file) {
	return file.compareTo(other.file);
	}

	if (offset != other.offset) {
	return offset - other.offset;
	}

	return message.compareTo(other.message);
	}

	@override
	String toString() => '${severity!.toLowerCase()} • '
	'$message • $file:$startLine:$startColumn • '
	'($code)';
	}

	class DiagnosticMessage {
	final Map<String, dynamic> json;

	DiagnosticMessage(this.json);

	int? get column => json['location']['startColumn'] as int?;

	int? get endColumn => json['location']['endColumn'] as int?;

	int? get endLine => json['location']['endLine'] as int?;

	String get filePath => json['location']['file'] as String;

	int get length => json['location']['length'] as int;

	int get line => json['location']['startLine'] as int;

	String get message => json['message'] as String;

	int get offset => json['location']['offset'] as int;
	}

	class FileAnalysisErrors {
	final String file;
	final List<AnalysisError> errors;

	FileAnalysisErrors(this.file, this.errors);
	}

	class RequestError {
	static RequestError parse(dynamic error) {
	return RequestError(
	error['code'],
	error['message'],
	stackTrace: error['stackTrace'],
	);
	}

	final String code;
	final String message;
	final String stackTrace;

	RequestError(this.code, this.message, {required this.stackTrace});

	@override
	String toString() => '[RequestError code: $code, message: $message]';
	}