Control flow collections: flutter_tools/

packages/flutter_tools/lib/src/android/android_studio.dart

@@ -384,17 +384,12 @@ class AndroidStudio {
     final String? homeDirPath = globals.fsUtils.homeDirPath;
 
     if (homeDirPath != null && globals.fs.directory(homeDirPath).existsSync()) {
-      final Directory homeDir = globals.fs.directory(homeDirPath);
-
-      final List<Directory> directoriesToSearch = <Directory>[homeDir];
-
       // >=4.1 has new install location at $HOME/.cache/Google
-      final String cacheDirPath =
-          globals.fs.path.join(homeDirPath, '.cache', 'Google');
-
-      if (globals.fs.isDirectorySync(cacheDirPath)) {
-        directoriesToSearch.add(globals.fs.directory(cacheDirPath));
-      }
+      final String cacheDirPath = globals.fs.path.join(homeDirPath, '.cache', 'Google');
+      final List<Directory> directoriesToSearch = <Directory>[
+        globals.fs.directory(homeDirPath),
+        if (globals.fs.isDirectorySync(cacheDirPath)) globals.fs.directory(cacheDirPath),
+      ];
 
       final List<Directory> entities = <Directory>[];
 

packages/flutter_tools/lib/src/android/gradle.dart

@@ -811,14 +811,11 @@ class AndroidGradleBuilder implements AndroidBuilder {
       _logger.printError(result.stderr, wrap: false);
       return const <String>[];
     }
-    final List<String> options = <String>[];
-    for (final String line in LineSplitter.split(result.stdout)) {
-      final RegExpMatch? match = _kBuildVariantRegex.firstMatch(line);
-      if (match != null) {
-        options.add(match.namedGroup(_kBuildVariantRegexGroupName)!);
-      }
-    }
-    return options;
+    return <String>[
+      for (final String line in LineSplitter.split(result.stdout))
+        if (_kBuildVariantRegex.firstMatch(line) case final RegExpMatch match)
+          match.namedGroup(_kBuildVariantRegexGroupName)!,
+    ];
   }
 
   @override

packages/flutter_tools/lib/src/base/analyze_size.dart

@@ -469,18 +469,15 @@ class _SymbolNode {
   }
 
   Map<String, Object?> toJson() {
-    final Map<String, Object?> json = <String, Object?>{
+    final List<Map<String, Object?>> childrenAsJson = <Map<String, Object?>>[
+      for (final _SymbolNode child in children) child.toJson(),
+    ];
+
+    return <String, Object?>{
       'n': name,
       'value': byteSize,
+      if (childrenAsJson.isNotEmpty) 'children': childrenAsJson,
     };
-    final List<Map<String, Object?>> childrenAsJson = <Map<String, Object?>>[];
-    for (final _SymbolNode child in children) {
-      childrenAsJson.add(child.toJson());
-    }
-    if (childrenAsJson.isNotEmpty) {
-      json['children'] = childrenAsJson;
-    }
-    return json;
   }
 }
 

packages/flutter_tools/lib/src/base/deferred_component.dart

@@ -71,14 +71,11 @@ class DeferredComponent {
   /// status, but will result in [loadingUnits] returning an empty set.
   void assignLoadingUnits(List<LoadingUnit> allLoadingUnits) {
     _assigned = true;
-    _loadingUnits = <LoadingUnit>{};
-    for (final String lib in libraries) {
-      for (final LoadingUnit loadingUnit in allLoadingUnits) {
-        if (loadingUnit.libraries.contains(lib)) {
-          _loadingUnits!.add(loadingUnit);
-        }
-      }
-    }
+    _loadingUnits = <LoadingUnit>{
+      for (final String lib in libraries)
+        for (final LoadingUnit loadingUnit in allLoadingUnits)
+          if (loadingUnit.libraries.contains(lib)) loadingUnit,
+    };
   }
 
   /// Provides a human readable string representation of the
@@ -193,21 +190,16 @@ class LoadingUnit {
     } on FormatException catch (e) {
       logger.printError('Loading unit manifest at `${manifestFile.path}` was invalid JSON:\n$e');
     }
-    final List<LoadingUnit> loadingUnits = <LoadingUnit>[];
-    // Setup android source directory
-    if (manifest != null) {
-      for (final dynamic loadingUnitMetadata in manifest['loadingUnits'] as List<dynamic>) {
-        final Map<String, dynamic> loadingUnitMap = loadingUnitMetadata as Map<String, dynamic>;
-        if (loadingUnitMap['id'] == 1) {
-          continue; // Skip base unit
-        }
-        loadingUnits.add(LoadingUnit(
-          id: loadingUnitMap['id'] as int,
-          path: loadingUnitMap['path'] as String,
-          libraries: List<String>.from(loadingUnitMap['libraries'] as List<dynamic>)),
-        );
-      }
-    }
-    return loadingUnits;
+    // Set up android source directory
+    return <LoadingUnit>[
+      if (manifest?['loadingUnits'] case final List<dynamic> loadingUnits)
+        for (final Map<String, dynamic> loadingUnitMap in loadingUnits.cast<Map<String, dynamic>>())
+          if (loadingUnitMap['id'] != 1) // skip base unit
+            LoadingUnit(
+              id: loadingUnitMap['id'] as int,
+              path: loadingUnitMap['path'] as String,
+              libraries: List<String>.from(loadingUnitMap['libraries'] as List<dynamic>),
+            ),
+    ];
   }
 }

packages/flutter_tools/lib/src/base/process.dart

@@ -69,13 +69,10 @@ class _DefaultShutdownHooks implements ShutdownHooks {
     );
     _shutdownHooksRunning = true;
     try {
-      final List<Future<dynamic>> futures = <Future<dynamic>>[];
-      for (final ShutdownHook shutdownHook in registeredHooks) {
-        final FutureOr<dynamic> result = shutdownHook();
-        if (result is Future<dynamic>) {
-          futures.add(result);
-        }
-      }
+      final List<Future<dynamic>> futures = <Future<dynamic>>[
+        for (final ShutdownHook shutdownHook in registeredHooks)
+          if (shutdownHook() case final Future<dynamic> result) result,
+      ];
       await Future.wait<dynamic>(futures);
     } finally {
       _shutdownHooksRunning = false;

packages/flutter_tools/lib/src/build_system/build_system.dart

@@ -182,21 +182,13 @@ abstract class Target {
     List<File> outputs,
     Environment environment,
   ) {
-    final File stamp = _findStampFile(environment);
-    final List<String> inputPaths = <String>[];
-    for (final File input in inputs) {
-      inputPaths.add(input.path);
-    }
-    final List<String> outputPaths = <String>[];
-    for (final File output in outputs) {
-      outputPaths.add(output.path);
-    }
-    final String? key = buildKey;
+    String getPath(File file) => file.path;
     final Map<String, Object> result = <String, Object>{
-      'inputs': inputPaths,
-      'outputs': outputPaths,
-      if (key != null) 'buildKey': key,
+      'inputs': inputs.map(getPath).toList(),
+      'outputs': outputs.map(getPath).toList(),
+      if (buildKey case final String key) 'buildKey': key,
     };
+    final File stamp = _findStampFile(environment);
     if (!stamp.existsSync()) {
       stamp.createSync();
     }

packages/flutter_tools/lib/src/build_system/depfile.dart

@@ -58,20 +58,12 @@ class DepfileService {
   /// The [file] contains a list of newline separated file URIs. The output
   /// file must be manually specified.
   Depfile parseDart2js(File file, File output) {
-    final List<File> inputs = <File>[];
-    for (final String rawUri in file.readAsLinesSync()) {
-      if (rawUri.trim().isEmpty) {
-        continue;
-      }
-      final Uri? fileUri = Uri.tryParse(rawUri);
-      if (fileUri == null) {
-        continue;
-      }
-      if (fileUri.scheme != 'file') {
-        continue;
-      }
-      inputs.add(_fileSystem.file(fileUri));
-    }
+    final List<File> inputs = <File>[
+      for (final String rawUri in file.readAsLinesSync())
+        if (rawUri.trim().isNotEmpty)
+          if (Uri.tryParse(rawUri) case final Uri fileUri when fileUri.scheme == 'file')
+            _fileSystem.file(fileUri),
+    ];
     return Depfile(inputs, <File>[output]);
   }
 

packages/flutter_tools/lib/src/build_system/targets/deferred_components.dart

@@ -37,15 +37,11 @@ class DeferredComponentsGenSnapshotValidatorTarget extends Target {
 
   /// The abis to validate.
   List<String> get _abis {
-    final List<String> abis = <String>[];
-    for (final AndroidAotDeferredComponentsBundle target in deferredComponentsDependencies) {
-      if (deferredComponentsTargets.contains(target.name)) {
-        abis.add(
-          getAndroidArchForName(getNameForTargetPlatform(target.dependency.targetPlatform)).archName
-        );
-      }
-    }
-    return abis;
+    return <String>[
+      for (final AndroidAotDeferredComponentsBundle target in deferredComponentsDependencies)
+        if (deferredComponentsTargets.contains(target.name))
+          getAndroidArchForName(getNameForTargetPlatform(target.dependency.targetPlatform)).archName,
+    ];
   }
 
   @override

packages/flutter_tools/lib/src/commands/build_ios_framework.dart

@@ -112,19 +112,11 @@ abstract class BuildFrameworkCommand extends BuildSubCommand {
   late final FlutterProject project = FlutterProject.current();
 
   Future<List<BuildInfo>> getBuildInfos() async {
-    final List<BuildInfo> buildInfos = <BuildInfo>[];
-
-    if (boolArg('debug')) {
-      buildInfos.add(await getBuildInfo(forcedBuildMode: BuildMode.debug));
-    }
-    if (boolArg('profile')) {
-      buildInfos.add(await getBuildInfo(forcedBuildMode: BuildMode.profile));
-    }
-    if (boolArg('release')) {
-      buildInfos.add(await getBuildInfo(forcedBuildMode: BuildMode.release));
-    }
-
-    return buildInfos;
+    return <BuildInfo>[
+      if (boolArg('debug'))   await getBuildInfo(forcedBuildMode: BuildMode.debug),
+      if (boolArg('profile')) await getBuildInfo(forcedBuildMode: BuildMode.profile),
+      if (boolArg('release')) await getBuildInfo(forcedBuildMode: BuildMode.release),
+    ];
   }
 
   @override

packages/flutter_tools/lib/src/custom_devices/custom_device.dart

@@ -101,14 +101,11 @@ class CustomDeviceLogReader extends DeviceLogReader {
   /// [logLines] as done.
   @override
   Future<void> dispose() async {
-    final List<Future<void>> futures = <Future<void>>[];
-
-    for (final StreamSubscription<String> subscription in subscriptions) {
-      futures.add(subscription.cancel());
-    }
-
-    futures.add(logLinesController.close());
-
+    final List<Future<void>> futures = <Future<void>>[
+      for (final StreamSubscription<String> subscription in subscriptions)
+        subscription.cancel(),
+      logLinesController.close(),
+    ];
     await Future.wait(futures);
   }
 

packages/flutter_tools/lib/src/doctor.dart

@@ -196,42 +196,16 @@ class _DefaultDoctorValidatorsProvider implements DoctorValidatorsProvider {
 
   @override
   List<Workflow> get workflows {
-    if (_workflows == null) {
-      _workflows = <Workflow>[];
-
-      if (globals.iosWorkflow!.appliesToHostPlatform) {
-        _workflows!.add(globals.iosWorkflow!);
-      }
-
-      if (androidWorkflow?.appliesToHostPlatform ?? false) {
-        _workflows!.add(androidWorkflow!);
-      }
-
-      if (fuchsiaWorkflow?.appliesToHostPlatform ?? false) {
-        _workflows!.add(fuchsiaWorkflow!);
-      }
-
-      if (linuxWorkflow.appliesToHostPlatform) {
-        _workflows!.add(linuxWorkflow);
-      }
-
-      if (macOSWorkflow.appliesToHostPlatform) {
-        _workflows!.add(macOSWorkflow);
-      }
-
-      if (windowsWorkflow?.appliesToHostPlatform ?? false) {
-        _workflows!.add(windowsWorkflow!);
-      }
-
-      if (webWorkflow.appliesToHostPlatform) {
-        _workflows!.add(webWorkflow);
-      }
-
-      if (customDeviceWorkflow.appliesToHostPlatform) {
-        _workflows!.add(customDeviceWorkflow);
-      }
-    }
-    return _workflows!;
+    return _workflows ??= <Workflow>[
+      if (globals.iosWorkflow!.appliesToHostPlatform)      globals.iosWorkflow!,
+      if (androidWorkflow?.appliesToHostPlatform ?? false) androidWorkflow!,
+      if (fuchsiaWorkflow?.appliesToHostPlatform ?? false) fuchsiaWorkflow!,
+      if (linuxWorkflow.appliesToHostPlatform)             linuxWorkflow,
+      if (macOSWorkflow.appliesToHostPlatform)             macOSWorkflow,
+      if (windowsWorkflow?.appliesToHostPlatform ?? false) windowsWorkflow!,
+      if (webWorkflow.appliesToHostPlatform)               webWorkflow,
+      if (customDeviceWorkflow.appliesToHostPlatform)      customDeviceWorkflow,
+    ];
   }
 }
 

packages/flutter_tools/lib/src/flutter_plugins.dart

@@ -316,14 +316,11 @@ public final class GeneratedPluginRegistrant {
 ''';
 
 List<Map<String, Object?>> _extractPlatformMaps(List<Plugin> plugins, String type) {
-  final List<Map<String, Object?>> pluginConfigs = <Map<String, Object?>>[];
-  for (final Plugin p in plugins) {
-    final PluginPlatform? platformPlugin = p.platforms[type];
-    if (platformPlugin != null) {
-      pluginConfigs.add(platformPlugin.toMap());
-    }
-  }
-  return pluginConfigs;
+  return <Map<String, Object?>>[
+    for (final Plugin plugin in plugins)
+      if (plugin.platforms[type] case final PluginPlatform platformPlugin)
+        platformPlugin.toMap(),
+  ];
 }
 
 Future<void> _writeAndroidPluginRegistrant(FlutterProject project, List<Plugin> plugins) async {

packages/flutter_tools/lib/src/fuchsia/fuchsia_device.dart

@@ -188,15 +188,10 @@ class FuchsiaDevices extends PollingDeviceDiscovery {
     if (text == null || text.isEmpty) {
       return <Device>[];
     }
-    final List<FuchsiaDevice> devices = <FuchsiaDevice>[];
-    for (final String line in text) {
-      final FuchsiaDevice? device = await _parseDevice(line);
-      if (device == null) {
-        continue;
-      }
-      devices.add(device);
-    }
-    return devices;
+    return <FuchsiaDevice>[
+      for (final String line in text)
+        if (await _parseDevice(line) case final FuchsiaDevice device) device,
+    ];
   }
 
   @override