[flutter_tools] Separate style and data from AnalysisError (#60591)

packages/flutter_tools/lib/src/dart/analysis.dart

@@ -19,7 +19,9 @@ import '../convert.dart';
 
 /// An interface to the Dart analysis server.
 class AnalysisServer {
-  AnalysisServer(this.sdkPath, this.directories, {
+  AnalysisServer(
+    this.sdkPath,
+    this.directories, {
     @required FileSystem fileSystem,
     @required ProcessManager processManager,
     @required Logger logger,
@@ -78,12 +80,14 @@ class AnalysisServer {
     // This callback hookup can't throw.
     unawaited(_process.exitCode.whenComplete(() => _process = null));
 
-    final Stream<String> errorStream =
-        _process.stderr.transform<String>(utf8.decoder).transform<String>(const LineSplitter());
+    final Stream<String> errorStream = _process.stderr
+        .transform<String>(utf8.decoder)
+        .transform<String>(const LineSplitter());
     errorStream.listen(_logger.printError);
 
-    final Stream<String> inStream =
-        _process.stdout.transform<String>(utf8.decoder).transform<String>(const LineSplitter());
+    final Stream<String> inStream = _process.stdout
+        .transform<String>(utf8.decoder)
+        .transform<String>(const LineSplitter());
     inStream.listen(_handleServerResponse);
 
     _sendCommand('server.setSubscriptions', <String, dynamic>{
@@ -95,7 +99,9 @@ class AnalysisServer {
   }
 
   bool get didServerErrorOccur => _didServerErrorOccur;
+
   Stream<bool> get onAnalyzing => _analyzingController.stream;
+
   Stream<FileAnalysisErrors> get onErrors => _errorsController.stream;
 
   Future<int> get onExit => _process.exitCode;
@@ -165,7 +171,7 @@ class AnalysisServer {
     final List<AnalysisError> errors = errorsList
         .map<Map<String, dynamic>>(castStringKeyedMap)
         .map<AnalysisError>((Map<String, dynamic> json) {
-          return AnalysisError(json,
+          return AnalysisError(WrittenError.fromJson(json),
             fileSystem: _fileSystem,
             platform: _platform,
             terminal: _terminal,
@@ -191,8 +197,10 @@ enum _AnalysisSeverity {
   none,
 }
 
+/// [AnalysisError] with command line style.
 class AnalysisError implements Comparable<AnalysisError> {
-  AnalysisError(this.json, {
+  AnalysisError(
+    this.writtenError, {
     @required Platform platform,
     @required Terminal terminal,
     @required FileSystem fileSystem,
@@ -200,85 +208,132 @@ class AnalysisError implements Comparable<AnalysisError> {
        _terminal = terminal,
        _fileSystem = fileSystem;
 
+  final WrittenError writtenError;
   final Platform _platform;
   final Terminal _terminal;
   final FileSystem _fileSystem;
 
-  static final Map<String, _AnalysisSeverity> _severityMap = <String, _AnalysisSeverity>{
-    'INFO': _AnalysisSeverity.info,
-    'WARNING': _AnalysisSeverity.warning,
-    'ERROR': _AnalysisSeverity.error,
-  };
-
-  String  get _separator => _platform.isWindows ? '-' : '•';
+  String get _separator => _platform.isWindows ? '-' : '•';
 
-  // "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;
   String get colorSeverity {
-    switch(_severityLevel) {
+    switch (writtenError.severityLevel) {
       case _AnalysisSeverity.error:
-        return _terminal.color(severity, TerminalColor.red);
+        return _terminal.color(writtenError.severity, TerminalColor.red);
       case _AnalysisSeverity.warning:
-        return _terminal.color(severity, TerminalColor.yellow);
+        return _terminal.color(writtenError.severity, TerminalColor.yellow);
       case _AnalysisSeverity.info:
       case _AnalysisSeverity.none:
-        return severity;
+        return writtenError.severity;
     }
     return null;
   }
-  _AnalysisSeverity get _severityLevel => _severityMap[severity] ?? _AnalysisSeverity.none;
-  String get type => json['type'] as String;
-  String get message => json['message'] as String;
-  String get code => json['code'] as String;
-
-  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;
 
-  String get messageSentenceFragment {
-    if (message.endsWith('.')) {
-      return message.substring(0, message.length - 1);
-    } else {
-      return message;
-    }
-  }
+  String get type => writtenError.type;
+  String get code => writtenError.code;
 
   @override
   int compareTo(AnalysisError other) {
     // Sort in order of file path, error location, severity, and message.
-    if (file != other.file) {
-      return file.compareTo(other.file);
+    if (writtenError.file != other.writtenError.file) {
+      return writtenError.file.compareTo(other.writtenError.file);
     }
 
-    if (offset != other.offset) {
-      return offset - other.offset;
+    if (writtenError.offset != other.writtenError.offset) {
+      return writtenError.offset - other.writtenError.offset;
     }
 
-    final int diff = other._severityLevel.index - _severityLevel.index;
+    final int diff = other.writtenError.severityLevel.index -
+        writtenError.severityLevel.index;
     if (diff != 0) {
       return diff;
     }
 
-    return message.compareTo(other.message);
+    return writtenError.message.compareTo(other.writtenError.message);
   }
 
   @override
   String toString() {
     // Can't use "padLeft" because of ANSI color sequences in the colorized
     // severity.
-    final String padding = ' ' * math.max(0, 7 - severity.length);
+    final String padding = ' ' * math.max(0, 7 - writtenError.severity.length);
     return '$padding${colorSeverity.toLowerCase()} $_separator '
-        '$messageSentenceFragment $_separator '
-        '${_fileSystem.path.relative(file)}:$startLine:$startColumn $_separator '
+        '${writtenError.messageSentenceFragment} $_separator '
+        '${_fileSystem.path.relative(writtenError.file)}:${writtenError.startLine}:${writtenError.startColumn} $_separator '
         '$code';
   }
 
   String toLegacyString() {
+    return writtenError.toString();
+  }
+}
+
+/// [AnalysisError] in plain text content.
+class WrittenError {
+  WrittenError._({
+    @required this.severity,
+    @required this.type,
+    @required this.message,
+    @required this.code,
+    @required this.file,
+    @required this.startLine,
+    @required this.startColumn,
+    @required this.offset,
+  });
+
+  ///  {
+  ///      "severity":"INFO",
+  ///      "type":"TODO",
+  ///      "location":{
+  ///          "file":"/Users/.../lib/test.dart",
+  ///          "offset":362,
+  ///          "length":72,
+  ///          "startLine":15,
+  ///         "startColumn":4
+  ///      },
+  ///      "message":"...",
+  ///      "hasFix":false
+  ///  }
+  static WrittenError fromJson(Map<String, dynamic> json) {
+    return WrittenError._(
+      severity: json['severity'] as String,
+      type: json['type'] as String,
+      message: json['message'] as String,
+      code: json['code'] as String,
+      file: json['location']['file'] as String,
+      startLine: json['location']['startLine'] as int,
+      startColumn: json['location']['startColumn'] as int,
+      offset: json['location']['offset'] as int,
+    );
+  }
+
+  final String severity;
+  final String type;
+  final String message;
+  final String code;
+
+  final String file;
+  final int startLine;
+  final int startColumn;
+  final int offset;
+
+  static final Map<String, _AnalysisSeverity> _severityMap = <String, _AnalysisSeverity>{
+    'INFO': _AnalysisSeverity.info,
+    'WARNING': _AnalysisSeverity.warning,
+    'ERROR': _AnalysisSeverity.error,
+  };
+
+  _AnalysisSeverity get severityLevel =>
+      _severityMap[severity] ?? _AnalysisSeverity.none;
+
+  String get messageSentenceFragment {
+    if (message.endsWith('.')) {
+      return message.substring(0, message.length - 1);
+    }
+    return message;
+  }
+
+  @override
+  String toString() {
     return '[${severity.toLowerCase()}] $messageSentenceFragment ($file:$startLine:$startColumn)';
   }
 }

packages/flutter_tools/test/commands.shard/hermetic/analyze_test.dart

@@ -6,6 +6,7 @@ import 'package:file/file.dart';
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/commands/analyze_base.dart';
+import 'package:flutter_tools/src/dart/analysis.dart';
 
 import '../../src/common.dart';
 
@@ -43,6 +44,24 @@ void main() {
     inRepo(null, fileSystem);
     inRepo(<String>[], fileSystem);
   });
+
+  testWithoutContext('AnalysisError from json write correct', () {
+    final Map<String, dynamic> json = <String, dynamic>{
+      'severity': 'INFO',
+      'type': 'TODO',
+      'location': <String, dynamic>{
+        'file': '/Users/.../lib/test.dart',
+        'offset': 362,
+        'length': 72,
+        'startLine': 15,
+        'startColumn': 4
+      },
+      'message': 'Prefer final for variable declarations if they are not reassigned.',
+      'hasFix': false
+    };
+    expect(WrittenError.fromJson(json).toString(),
+        '[info] Prefer final for variable declarations if they are not reassigned (/Users/.../lib/test.dart:15:4)');
+  });
 }
 
 bool inRepo(List<String> fileList, FileSystem fileSystem) {