├── .gitignore ├── CHANGELOG.md ├── LICENSE ├── README.md ├── example ├── .gitignore ├── .metadata ├── README.md ├── android │ ├── .gitignore │ ├── app │ │ ├── build.gradle │ │ └── src │ │ │ └── main │ │ │ ├── AndroidManifest.xml │ │ │ ├── java │ │ │ └── com │ │ │ │ └── example │ │ │ │ └── example │ │ │ │ └── MainActivity.java │ │ │ └── res │ │ │ ├── drawable │ │ │ └── launch_background.xml │ │ │ ├── mipmap-hdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-mdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xhdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxhdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxxhdpi │ │ │ └── ic_launcher.png │ │ │ └── values │ │ │ └── styles.xml │ ├── build.gradle │ ├── gradle.properties │ ├── gradle │ │ └── wrapper │ │ │ └── gradle-wrapper.properties │ └── settings.gradle ├── ios │ ├── .gitignore │ ├── Flutter │ │ ├── AppFrameworkInfo.plist │ │ ├── Debug.xcconfig │ │ └── Release.xcconfig │ ├── Runner.xcodeproj │ │ ├── project.pbxproj │ │ ├── project.xcworkspace │ │ │ └── contents.xcworkspacedata │ │ └── xcshareddata │ │ │ └── xcschemes │ │ │ └── Runner.xcscheme │ ├── Runner.xcworkspace │ │ └── contents.xcworkspacedata │ └── Runner │ │ ├── AppDelegate.h │ │ ├── AppDelegate.m │ │ ├── Assets.xcassets │ │ ├── AppIcon.appiconset │ │ │ ├── Contents.json │ │ │ ├── Icon-App-1024x1024@1x.png │ │ │ ├── Icon-App-20x20@1x.png │ │ │ ├── Icon-App-20x20@2x.png │ │ │ ├── Icon-App-20x20@3x.png │ │ │ ├── Icon-App-29x29@1x.png │ │ │ ├── Icon-App-29x29@2x.png │ │ │ ├── Icon-App-29x29@3x.png │ │ │ ├── Icon-App-40x40@1x.png │ │ │ ├── Icon-App-40x40@2x.png │ │ │ ├── Icon-App-40x40@3x.png │ │ │ ├── Icon-App-60x60@2x.png │ │ │ ├── Icon-App-60x60@3x.png │ │ │ ├── Icon-App-76x76@1x.png │ │ │ ├── Icon-App-76x76@2x.png │ │ │ └── Icon-App-83.5x83.5@2x.png │ │ └── LaunchImage.imageset │ │ │ ├── Contents.json │ │ │ ├── LaunchImage.png │ │ │ ├── LaunchImage@2x.png │ │ │ ├── LaunchImage@3x.png │ │ │ └── README.md │ │ ├── Base.lproj │ │ ├── LaunchScreen.storyboard │ │ └── Main.storyboard │ │ ├── Info.plist │ │ └── main.m ├── lib │ ├── main.dart │ ├── models.dart │ └── repo.dart └── pubspec.yaml ├── sealed_class ├── LICENSE ├── README.md ├── lib │ ├── sealed_class.dart │ └── src │ │ └── sealed.dart ├── pubspec.yaml └── test │ └── sealed_class_test.dart └── sealed_class_generator ├── LICENSE ├── README.md ├── build.yaml ├── lib ├── sealed_class_generator.dart └── src │ ├── checker.dart │ ├── common.dart │ ├── gen.dart │ ├── printer.dart │ ├── transformer.dart │ └── visitor.dart ├── pubspec.yaml └── test ├── printer_test.dart └── transformer_test.dart /.gitignore: -------------------------------------------------------------------------------- 1 | # Dart Lib specific 2 | pubspec.lock 3 | 4 | # Miscellaneous 5 | *.class 6 | *.log 7 | *.pyc 8 | *.swp 9 | .DS_Store 10 | .atom/ 11 | .buildlog/ 12 | .history 13 | .svn/ 14 | 15 | # IntelliJ related 16 | *.iml 17 | *.ipr 18 | *.iws 19 | .idea/* 20 | !.idea/codeStyles/ 21 | !.idea/runConfigurations/ 22 | !.idea/live_templates.jar 23 | 24 | # Visual Studio Code related 25 | .vscode/ 26 | 27 | # Flutter/Dart/Pub related 28 | **/doc/api/ 29 | .dart_tool/ 30 | .flutter-plugins 31 | .packages 32 | .pub-cache/ 33 | .pub/ 34 | /build/ 35 | 36 | # Android related 37 | **/android/**/gradle-wrapper.jar 38 | **/android/.gradle 39 | **/android/captures/ 40 | **/android/gradlew 41 | **/android/gradlew.bat 42 | **/android/local.properties 43 | **/android/**/GeneratedPluginRegistrant.java 44 | 45 | # iOS/XCode related 46 | **/ios/**/*.mode1v3 47 | **/ios/**/*.mode2v3 48 | **/ios/**/*.moved-aside 49 | **/ios/**/*.pbxuser 50 | **/ios/**/*.perspectivev3 51 | **/ios/**/*sync/ 52 | **/ios/**/.sconsign.dblite 53 | **/ios/**/.tags* 54 | **/ios/**/.vagrant/ 55 | **/ios/**/DerivedData/ 56 | **/ios/**/Icon? 57 | **/ios/**/Pods/ 58 | **/ios/**/.symlinks/ 59 | **/ios/**/profile 60 | **/ios/**/xcuserdata 61 | **/ios/.generated/ 62 | **/ios/Flutter/App.framework 63 | **/ios/Flutter/Flutter.framework 64 | **/ios/Flutter/Generated.xcconfig 65 | **/ios/Flutter/app.flx 66 | **/ios/Flutter/app.zip 67 | **/ios/Flutter/flutter_assets/ 68 | **/ios/ServiceDefinitions.json 69 | **/ios/Runner/GeneratedPluginRegistrant.* 70 | 71 | # Exceptions to above rules. 72 | !**/ios/**/default.mode1v3 73 | !**/ios/**/default.mode2v3 74 | !**/ios/**/default.pbxuser 75 | !**/ios/**/default.perspectivev3 76 | !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages 77 | 78 | # Test files 79 | test/tempfiles 80 | /example/build/ 81 | -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # 3.0.0 2 | * Use if checks so it works for subclasses too 3 | 4 | # 2.0.0 5 | * Add dependency on Dart 2.6 6 | 7 | # 1.0.0 8 | * Initial release 9 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2019 Tim Rijckaert 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Sealed Class Generator 2 | 3 | sealed_class: [![pub package](https://img.shields.io/pub/v/sealed_class.svg)](https://pub.dartlang.org/packages/sealed_class) 4 | sealed_class_generator: [![pub package](https://img.shields.io/pub/v/sealed_class_generator.svg)](https://pub.dartlang.org/packages/sealed_class_generator) 5 | 6 | Fix Dart's lack of a sealed class. 7 | Inspired by [Kotlin's implementation](https://kotlinlang.org/docs/reference/sealed-classes.html) and by [Sealed Unions](https://pub.dev/packages/sealed_unions). 8 | With this lib you can generate an unlimited amount of sealed subclasses. 9 | 10 | ## Installation 11 | 12 | ```yaml 13 | dependencies: 14 | sealed_class: 2.0.0 15 | 16 | dev_dependencies: 17 | sealed_class_generator: 2.0.0 18 | build_runner: X.X.X 19 | ``` 20 | 21 | ## How to use: 22 | 23 | A complete example is found in the [example](https://github.com/timrijckaert/sealed_class_generator/tree/master/example). 24 | 25 | Define your `Sealed` class by annotating it with `@Sealed()` 26 | 27 | ```dart 28 | part 'yourfilename.g.dart'; 29 | 30 | @Sealed() 31 | abstract class Result{} 32 | ``` 33 | 34 | Add the subclasses to the annotation. 35 | 36 | ```dart 37 | part 'yourfilename.g.dart'; 38 | 39 | @Sealed([Failure, Success]) 40 | abstract class Result{} 41 | ``` 42 | 43 | Your subclasses should implement your sealed class. 44 | 45 | ```dart 46 | @Sealed([Failure, Success]) 47 | abstract class Result {} 48 | 49 | class Failure implements Result { 50 | final String errorMessage; 51 | 52 | Failure(this.errorMessage); 53 | } 54 | 55 | class Success implements Result { 56 | final String data; 57 | 58 | Success(this.data); 59 | } 60 | ``` 61 | 62 | The complete file should now look like this: 63 | 64 | ````dart 65 | import 'package:sealed_class/sealed_class.dart'; 66 | 67 | part 'yourfilename.g.dart'; 68 | 69 | @Sealed([Failure, Success]) 70 | abstract class Result {} 71 | 72 | class Failure implements Result { 73 | final String errorMessage; 74 | 75 | Failure(this.errorMessage); 76 | } 77 | 78 | class Success implements Result { 79 | final String data; 80 | 81 | Success(this.data); 82 | } 83 | ```` 84 | 85 | To make it compile run the following command in the terminal: 86 | 87 | ```shell script 88 | flutter packages pub run build_runner build --delete-conflicting-outputs 89 | ``` 90 | 91 | You can do: 92 | 93 | ```dart 94 | void main() { 95 | final someResult = Success("Woohoo Sealed classes in Dart"); 96 | someResult.continued( 97 | (failure) { 98 | print("Oh no it failed with errorMessage: ${failure.errorMessage}"); 99 | }, 100 | (success) { 101 | print(success.data); 102 | }, 103 | ); 104 | 105 | //Or if you want to reduce it to another value use `join` 106 | final someOtherResult = Failure("Some Error Message"); 107 | final mapResult = someOtherResult.join( 108 | (failure) => failure.errorMessage, 109 | (success) => success.data, 110 | ); 111 | print(mapResult); 112 | } 113 | ``` 114 | -------------------------------------------------------------------------------- /example/.gitignore: -------------------------------------------------------------------------------- 1 | models.g.dart -------------------------------------------------------------------------------- /example/.metadata: -------------------------------------------------------------------------------- 1 | # This file tracks properties of this Flutter project. 2 | # Used by Flutter tool to assess capabilities and perform upgrades etc. 3 | # 4 | # This file should be version controlled and should not be manually edited. 5 | 6 | version: 7 | revision: 5ab9e70727d858def3a586db7fb98ee580352957 8 | channel: beta 9 | -------------------------------------------------------------------------------- /example/README.md: -------------------------------------------------------------------------------- 1 | To run the sample you'll need to run the following generation script: 2 | 3 | ```bash 4 | flutter packages pub run build_runner build --delete-conflicting-outputs 5 | ``` 6 | 7 | This sample shows a more practical use case for sealed classes. 8 | 9 | Imagine having a `List` of different data types, all of these items need their own specific UI. 10 | We have 4 different data types: 11 | - `ContainerData` 12 | - `TextData` 13 | - `BoringData` 14 | - `FlutterLogoData` 15 | 16 | Inside the `build` method of the Widget that contains the `List` we could type check each one of them: 17 | 18 | ```dart 19 | class MyHomePage extends StatelessWidget { 20 | MyHomePage({Key key}) : super(key: key); 21 | 22 | @override 23 | Widget build(BuildContext context) { 24 | final repository = Repo(); 25 | final rawData = repository.generateRandomData(); 26 | 27 | final widgets = rawData.map((data) { 28 | Widget widget; 29 | if (data is ContainerData) { 30 | widget = MyContainer(data); 31 | } else if (data is TextData) { 32 | widget = MyText(data); 33 | } else if (data is BoringData) { 34 | widget = MyBoringWidget(data); 35 | } else if (data is FlutterLogoData) { 36 | widget = MyFlutterLogo(data); 37 | } 38 | return widget; 39 | }).toList(growable: false); 40 | 41 | return Scaffold( 42 | appBar: AppBar(title: Text("Sealed Class Examples")), 43 | body: ListView(children: widgets), 44 | ); 45 | } 46 | } 47 | ``` 48 | 49 | But what happens if we forget a case? 50 | Dart will happily compile, but it will crash at run time, because you forgot to add a case. 51 | 52 | What if we could catch this error at compilation time? 53 | That's where this library comes in. 54 | You tell Dart all the possible cases and it won't let you forget a case. 55 | 56 | The above code become. 57 | 58 | ```dart 59 | class MyHomePage extends StatelessWidget { 60 | MyHomePage({Key key}) : super(key: key); 61 | 62 | @override 63 | Widget build(BuildContext context) { 64 | final repository = Repo(); 65 | final rawData = repository.generateRandomData(); 66 | final widgets = rawData 67 | .map( 68 | (data) => data.fold( 69 | mapToContainerDataWidget, 70 | mapToTextDataWidget, 71 | mapToBoringDataWidget, 72 | mapToFlutterLogoWidget, 73 | ), 74 | ) 75 | .toList(growable: false); 76 | 77 | return Scaffold( 78 | appBar: AppBar(title: Text("Sealed Class Examples")), 79 | body: ListView(children: widgets), 80 | ); 81 | } 82 | 83 | Widget mapToContainerDataWidget(ContainerData data) => MyContainer(data); 84 | 85 | Widget mapToTextDataWidget(TextData data) => MyText(data); 86 | 87 | Widget mapToBoringDataWidget(BoringData data) => MyBoringWidget(data); 88 | 89 | Widget mapToFlutterLogoWidget(FlutterLogoData data) => MyFlutterLogo(data); 90 | } 91 | ``` 92 | -------------------------------------------------------------------------------- /example/android/.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | *.class 3 | .gradle 4 | /local.properties 5 | /.idea/workspace.xml 6 | /.idea/libraries 7 | .DS_Store 8 | /build 9 | /captures 10 | GeneratedPluginRegistrant.java 11 | -------------------------------------------------------------------------------- /example/android/app/build.gradle: -------------------------------------------------------------------------------- 1 | def localProperties = new Properties() 2 | def localPropertiesFile = rootProject.file('local.properties') 3 | if (localPropertiesFile.exists()) { 4 | localPropertiesFile.withReader('UTF-8') { reader -> 5 | localProperties.load(reader) 6 | } 7 | } 8 | 9 | def flutterRoot = localProperties.getProperty('flutter.sdk') 10 | if (flutterRoot == null) { 11 | throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.") 12 | } 13 | 14 | def flutterVersionCode = localProperties.getProperty('flutter.versionCode') 15 | if (flutterVersionCode == null) { 16 | flutterVersionCode = '1' 17 | } 18 | 19 | def flutterVersionName = localProperties.getProperty('flutter.versionName') 20 | if (flutterVersionName == null) { 21 | flutterVersionName = '1.0' 22 | } 23 | 24 | apply plugin: 'com.android.application' 25 | apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 26 | 27 | android { 28 | compileSdkVersion 29 29 | 30 | lintOptions { 31 | disable 'InvalidPackage' 32 | } 33 | 34 | defaultConfig { 35 | // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). 36 | applicationId "com.example.example" 37 | minSdkVersion 16 38 | targetSdkVersion 29 39 | versionCode flutterVersionCode.toInteger() 40 | versionName flutterVersionName 41 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 42 | } 43 | 44 | buildTypes { 45 | release { 46 | // TODO: Add your own signing config for the release build. 47 | // Signing with the debug keys for now, so `flutter run --release` works. 48 | signingConfig signingConfigs.debug 49 | } 50 | } 51 | } 52 | 53 | flutter { 54 | source '../..' 55 | } 56 | 57 | dependencies { 58 | testImplementation 'junit:junit:4.12' 59 | androidTestImplementation 'com.android.support.test:runner:1.0.2' 60 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' 61 | } 62 | -------------------------------------------------------------------------------- /example/android/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 4 | 8 | 9 | 10 | 15 | 19 | 26 | 30 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | -------------------------------------------------------------------------------- /example/android/app/src/main/java/com/example/example/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.example; 2 | 3 | import android.os.Bundle; 4 | import io.flutter.app.FlutterActivity; 5 | import io.flutter.plugins.GeneratedPluginRegistrant; 6 | 7 | public class MainActivity extends FlutterActivity { 8 | @Override 9 | protected void onCreate(Bundle savedInstanceState) { 10 | super.onCreate(savedInstanceState); 11 | GeneratedPluginRegistrant.registerWith(this); 12 | } 13 | } 14 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/drawable/launch_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 12 | 13 | -------------------------------------------------------------------------------- /example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png: 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-------------------------------------------------------------------------------- /example/android/app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 8 | 9 | -------------------------------------------------------------------------------- /example/android/build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | repositories { 3 | google() 4 | jcenter() 5 | } 6 | 7 | dependencies { 8 | classpath 'com.android.tools.build:gradle:3.5.1' 9 | } 10 | } 11 | 12 | allprojects { 13 | repositories { 14 | google() 15 | jcenter() 16 | } 17 | } 18 | 19 | rootProject.buildDir = '../build' 20 | subprojects { 21 | project.buildDir = "${rootProject.buildDir}/${project.name}" 22 | } 23 | subprojects { 24 | project.evaluationDependsOn(':app') 25 | } 26 | 27 | task clean(type: Delete) { 28 | delete rootProject.buildDir 29 | } 30 | -------------------------------------------------------------------------------- /example/android/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | android.enableR8=true 3 | -------------------------------------------------------------------------------- /example/android/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 23 08:50:38 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip 7 | -------------------------------------------------------------------------------- /example/android/settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | 3 | def flutterProjectRoot = rootProject.projectDir.parentFile.toPath() 4 | 5 | def plugins = new Properties() 6 | def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins') 7 | if (pluginsFile.exists()) { 8 | pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) } 9 | } 10 | 11 | plugins.each { name, path -> 12 | def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile() 13 | include ":$name" 14 | project(":$name").projectDir = pluginDirectory 15 | } 16 | -------------------------------------------------------------------------------- /example/ios/.gitignore: -------------------------------------------------------------------------------- 1 | .idea/ 2 | .vagrant/ 3 | .sconsign.dblite 4 | .svn/ 5 | 6 | .DS_Store 7 | *.swp 8 | profile 9 | 10 | DerivedData/ 11 | build/ 12 | GeneratedPluginRegistrant.h 13 | GeneratedPluginRegistrant.m 14 | 15 | .generated/ 16 | 17 | *.pbxuser 18 | *.mode1v3 19 | *.mode2v3 20 | *.perspectivev3 21 | 22 | !default.pbxuser 23 | !default.mode1v3 24 | !default.mode2v3 25 | !default.perspectivev3 26 | 27 | xcuserdata 28 | 29 | *.moved-aside 30 | 31 | *.pyc 32 | *sync/ 33 | Icon? 34 | .tags* 35 | 36 | /Flutter/app.flx 37 | /Flutter/app.zip 38 | /Flutter/flutter_assets/ 39 | /Flutter/App.framework 40 | /Flutter/Flutter.framework 41 | /Flutter/Generated.xcconfig 42 | /ServiceDefinitions.json 43 | 44 | Pods/ 45 | .symlinks/ 46 | 47 | flutter_export_environment.sh 48 | -------------------------------------------------------------------------------- /example/ios/Flutter/AppFrameworkInfo.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | App 9 | CFBundleIdentifier 10 | io.flutter.flutter.app 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | App 15 | CFBundlePackageType 16 | FMWK 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1.0 23 | 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| 84 | 85 | 86 | 88 | 89 | 92 | 93 | 94 | -------------------------------------------------------------------------------- /example/ios/Runner.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /example/ios/Runner/AppDelegate.h: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | 4 | @interface AppDelegate : FlutterAppDelegate 5 | 6 | @end 7 | -------------------------------------------------------------------------------- /example/ios/Runner/AppDelegate.m: -------------------------------------------------------------------------------- 1 | #include "AppDelegate.h" 2 | #include "GeneratedPluginRegistrant.h" 3 | 4 | @implementation AppDelegate 5 | 6 | - (BOOL)application:(UIApplication *)application 7 | didFinishLaunchingWithOptions:(NSDictionary 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| } 122 | } 123 | -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/vrtdev/sealed_class_generator/f2f1c96792802f8d588d70c2b2a8c03db5f8634d/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png -------------------------------------------------------------------------------- /example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/vrtdev/sealed_class_generator/f2f1c96792802f8d588d70c2b2a8c03db5f8634d/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png -------------------------------------------------------------------------------- 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| 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | -------------------------------------------------------------------------------- /example/ios/Runner/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /example/ios/Runner/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | example 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | $(FLUTTER_BUILD_NAME) 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | $(FLUTTER_BUILD_NUMBER) 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UISupportedInterfaceOrientations 30 | 31 | UIInterfaceOrientationPortrait 32 | UIInterfaceOrientationLandscapeLeft 33 | UIInterfaceOrientationLandscapeRight 34 | 35 | UISupportedInterfaceOrientations~ipad 36 | 37 | UIInterfaceOrientationPortrait 38 | UIInterfaceOrientationPortraitUpsideDown 39 | UIInterfaceOrientationLandscapeLeft 40 | UIInterfaceOrientationLandscapeRight 41 | 42 | UIViewControllerBasedStatusBarAppearance 43 | 44 | 45 | 46 | -------------------------------------------------------------------------------- /example/ios/Runner/main.m: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | #import "AppDelegate.h" 4 | 5 | int main(int argc, char* argv[]) { 6 | @autoreleasepool { 7 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /example/lib/main.dart: -------------------------------------------------------------------------------- 1 | import 'package:example/repo.dart'; 2 | import 'package:flutter/material.dart'; 3 | 4 | import 'models.dart'; 5 | 6 | void main() => runApp(MyApp()); 7 | 8 | class MyApp extends StatelessWidget { 9 | @override 10 | Widget build(BuildContext context) { 11 | return MaterialApp( 12 | title: 'A practical use case of sealed classes', 13 | theme: ThemeData.dark(), 14 | home: MyHomePage(), 15 | ); 16 | } 17 | } 18 | 19 | class MyHomePage extends StatelessWidget { 20 | MyHomePage({Key key}) : super(key: key); 21 | 22 | @override 23 | Widget build(BuildContext context) { 24 | final repository = Repo(); 25 | final rawData = repository.generateRandomData(); 26 | final widgets = rawData 27 | .map( 28 | (data) => data.join( 29 | mapToContainerDataWidget, 30 | mapToTextDataWidget, 31 | mapToBoringDataWidget, 32 | mapToFlutterLogoWidget, 33 | ), 34 | ) 35 | .toList(growable: false); 36 | 37 | return Scaffold( 38 | appBar: AppBar(title: Text("Sealed Class Examples")), 39 | body: ListView(children: widgets), 40 | ); 41 | } 42 | 43 | Widget mapToContainerDataWidget(ContainerData data) => MyContainer(data); 44 | 45 | Widget mapToTextDataWidget(TextData data) => MyText(data); 46 | 47 | Widget mapToBoringDataWidget(BoringData data) => MyBoringWidget(data); 48 | 49 | Widget mapToFlutterLogoWidget(FlutterLogoData data) => MyFlutterLogo(data); 50 | } 51 | 52 | // 53 | class MyContainer extends StatelessWidget { 54 | final ContainerData data; 55 | 56 | MyContainer(this.data, {Key key}) : super(key: key); 57 | 58 | @override 59 | Widget build(BuildContext context) => 60 | Container(height: 50, color: data.color); 61 | } 62 | 63 | class MyText extends StatelessWidget { 64 | final TextData data; 65 | 66 | const MyText(this.data, {Key key}) : super(key: key); 67 | 68 | @override 69 | Widget build(BuildContext context) => Text(data.text); 70 | } 71 | 72 | class MyBoringWidget extends StatelessWidget { 73 | final BoringData data; 74 | 75 | const MyBoringWidget(this.data, {Key key}) : super(key: key); 76 | 77 | @override 78 | Widget build(BuildContext context) => 79 | SizedBox(child: Placeholder(), height: 50); 80 | } 81 | 82 | class MyFlutterLogo extends StatelessWidget { 83 | final FlutterLogoData data; 84 | 85 | const MyFlutterLogo(this.data, {Key key}) : super(key: key); 86 | 87 | @override 88 | Widget build(BuildContext context) => FlutterLogo(duration: data.duration); 89 | } 90 | // 91 | -------------------------------------------------------------------------------- /example/lib/models.dart: -------------------------------------------------------------------------------- 1 | import 'dart:ui'; 2 | 3 | import 'package:flutter/cupertino.dart'; 4 | import 'package:sealed_class/sealed_class.dart'; 5 | 6 | part 'models.g.dart'; 7 | 8 | @Sealed([ 9 | ContainerData, 10 | TextData, 11 | BoringData, 12 | FlutterLogoData, 13 | ]) 14 | abstract class Data {} 15 | 16 | class ContainerData implements Data { 17 | final Color color; 18 | 19 | ContainerData(this.color); 20 | } 21 | 22 | class TextData implements Data { 23 | final String text; 24 | 25 | TextData(this.text); 26 | } 27 | 28 | class BoringData implements Data {} 29 | 30 | class FlutterLogoData implements Data { 31 | final Duration duration; 32 | 33 | FlutterLogoData(this.duration); 34 | } 35 | -------------------------------------------------------------------------------- /example/lib/repo.dart: -------------------------------------------------------------------------------- 1 | import 'dart:math'; 2 | import 'dart:ui'; 3 | 4 | import 'models.dart'; 5 | 6 | class Repo { 7 | static Random _random = Random(); 8 | static const _chars = "abcdefghijklmnopqrstuvwxyz"; 9 | 10 | List generateRandomData({final int amountOfData = 100}) => 11 | List.generate(amountOfData, (_) => _random.nextInt(4)).map((it) { 12 | Data d; 13 | switch (it) { 14 | case 0: 15 | d = ContainerData(_randomColor()); 16 | break; 17 | case 1: 18 | d = TextData(_randomString()); 19 | break; 20 | case 2: 21 | d = BoringData(); 22 | break; 23 | case 3: 24 | d = FlutterLogoData(Duration(seconds: 3)); 25 | break; 26 | } 27 | return d; 28 | }).toList(growable: false); 29 | 30 | Color _randomColor() => 31 | Color((_random.nextDouble() * 0xFFFFFF).toInt() << 0).withOpacity(1.0); 32 | 33 | String _randomString({final int strLength = 100}) { 34 | String result = ""; 35 | for (var i = 0; i < strLength; i++) { 36 | result += _chars[_random.nextInt(_chars.length)]; 37 | } 38 | return result; 39 | } 40 | } 41 | -------------------------------------------------------------------------------- /example/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: example 2 | description: A project used to demo the sealed class generator 3 | version: 1.0.0+1 4 | 5 | environment: 6 | sdk: ">=2.6.0 <3.0.0" 7 | 8 | dependencies: 9 | flutter: 10 | sdk: flutter 11 | sealed_class: 12 | path: ../sealed_class/ 13 | 14 | dev_dependencies: 15 | build_runner: ^1.7.1 16 | flutter_test: 17 | sdk: flutter 18 | sealed_class_generator: 19 | path: ../sealed_class_generator/ 20 | 21 | flutter: 22 | uses-material-design: true -------------------------------------------------------------------------------- /sealed_class/LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2019 Tim Rijckaert 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /sealed_class/README.md: -------------------------------------------------------------------------------- 1 | # Sealed Class Generator 2 | 3 | sealed_class: [![pub package](https://img.shields.io/pub/v/sealed_class.svg)](https://pub.dartlang.org/packages/sealed_class) 4 | sealed_class_generator: [![pub package](https://img.shields.io/pub/v/sealed_class_generator.svg)](https://pub.dartlang.org/packages/sealed_class_generator) 5 | 6 | Fix Dart's lack of a sealed class. 7 | Inspired by [Kotlin's implementation](https://kotlinlang.org/docs/reference/sealed-classes.html) and by [Sealed Unions](https://pub.dev/packages/sealed_unions). 8 | With this lib you can generate an unlimited amount of sealed subclasses. 9 | 10 | ## Installation 11 | 12 | ```yaml 13 | dependencies: 14 | sealed_class: 3.0.0 15 | 16 | dev_dependencies: 17 | sealed_class_generator: 3.0.0 18 | build_runner: X.X.X 19 | ``` 20 | 21 | ## How to use: 22 | 23 | A complete example is found in the [example](https://github.com/timrijckaert/sealed_class_generator/tree/master/example). 24 | 25 | Define your `Sealed` class by annotating it with `@Sealed()` 26 | 27 | ```dart 28 | part 'yourfilename.g.dart'; 29 | 30 | @Sealed() 31 | abstract class Result{} 32 | ``` 33 | 34 | Add the subclasses to the annotation. 35 | 36 | ```dart 37 | part 'yourfilename.g.dart'; 38 | 39 | @Sealed([Failure, Success]) 40 | abstract class Result{} 41 | ``` 42 | 43 | Your subclasses should implement your sealed class. 44 | 45 | ```dart 46 | @Sealed([Failure, Success]) 47 | abstract class Result {} 48 | 49 | class Failure implements Result { 50 | final String errorMessage; 51 | 52 | Failure(this.errorMessage); 53 | } 54 | 55 | class Success implements Result { 56 | final String data; 57 | 58 | Success(this.data); 59 | } 60 | ``` 61 | 62 | The complete file should now look like this: 63 | 64 | ````dart 65 | import 'package:sealed_class/sealed_class.dart'; 66 | 67 | part 'yourfilename.g.dart'; 68 | 69 | @Sealed([Failure, Success]) 70 | abstract class Result {} 71 | 72 | class Failure implements Result { 73 | final String errorMessage; 74 | 75 | Failure(this.errorMessage); 76 | } 77 | 78 | class Success implements Result { 79 | final String data; 80 | 81 | Success(this.data); 82 | } 83 | ```` 84 | 85 | To make it compile run the following command in the terminal: 86 | 87 | ```shell script 88 | flutter packages pub run build_runner build --delete-conflicting-outputs 89 | ``` 90 | 91 | You can do: 92 | 93 | ```dart 94 | void main() { 95 | final someResult = Success("Woohoo Sealed classes in Dart"); 96 | someResult.continued( 97 | (failure) { 98 | print("Oh no it failed with errorMessage: ${failure.errorMessage}"); 99 | }, 100 | (success) { 101 | print(success.data); 102 | }, 103 | ); 104 | 105 | //Or if you want to reduce it to another value use `join` 106 | final someOtherResult = Failure("Some Error Message"); 107 | final mapResult = someOtherResult.join( 108 | (failure) => failure.errorMessage, 109 | (success) => success.data, 110 | ); 111 | print(mapResult); 112 | } 113 | ``` 114 | -------------------------------------------------------------------------------- /sealed_class/lib/sealed_class.dart: -------------------------------------------------------------------------------- 1 | library sealed_class; 2 | 3 | export 'src/sealed.dart'; 4 | -------------------------------------------------------------------------------- /sealed_class/lib/src/sealed.dart: -------------------------------------------------------------------------------- 1 | class Sealed { 2 | final List types; 3 | 4 | const Sealed(this.types); 5 | } 6 | -------------------------------------------------------------------------------- /sealed_class/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: sealed_class 2 | description: Make a sealed class hierarchy 3 | version: 3.0.0 4 | homepage: https://github.com/vrtdev/sealed_class_generator 5 | repository: https://github.com/vrtdev/sealed_class_generator 6 | issue_tracker: https://github.com/vrtdev/sealed_class_generator/issues 7 | 8 | environment: 9 | sdk: ">=2.6.0 <3.0.0" 10 | 11 | dev_dependencies: 12 | test: ^1.9.3 -------------------------------------------------------------------------------- /sealed_class/test/sealed_class_test.dart: -------------------------------------------------------------------------------- 1 | import 'package:test/test.dart'; 2 | 3 | import 'package:sealed_class/sealed_class.dart'; 4 | 5 | void main() { 6 | } 7 | -------------------------------------------------------------------------------- /sealed_class_generator/LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2019 Tim Rijckaert 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /sealed_class_generator/README.md: -------------------------------------------------------------------------------- 1 | # Sealed Class Generator 2 | 3 | sealed_class: [![pub package](https://img.shields.io/pub/v/sealed_class.svg)](https://pub.dartlang.org/packages/sealed_class) 4 | sealed_class_generator: [![pub package](https://img.shields.io/pub/v/sealed_class_generator.svg)](https://pub.dartlang.org/packages/sealed_class_generator) 5 | 6 | Fix Dart's lack of a sealed class. 7 | Inspired by [Kotlin's implementation](https://kotlinlang.org/docs/reference/sealed-classes.html) and by [Sealed Unions](https://pub.dev/packages/sealed_unions). 8 | With this lib you can generate an unlimited amount of sealed subclasses. 9 | 10 | ## Installation 11 | 12 | ```yaml 13 | dependencies: 14 | sealed_class: 3.0.0 15 | 16 | dev_dependencies: 17 | sealed_class_generator: 3.0.0 18 | build_runner: X.X.X 19 | ``` 20 | 21 | ## How to use: 22 | 23 | A complete example is found in the [example](https://github.com/timrijckaert/sealed_class_generator/tree/master/example). 24 | 25 | Define your `Sealed` class by annotating it with `@Sealed()` 26 | 27 | ```dart 28 | part 'yourfilename.g.dart'; 29 | 30 | @Sealed() 31 | abstract class Result{} 32 | ``` 33 | 34 | Add the subclasses to the annotation. 35 | 36 | ```dart 37 | part 'yourfilename.g.dart'; 38 | 39 | @Sealed([Failure, Success]) 40 | abstract class Result{} 41 | ``` 42 | 43 | Your subclasses should implement your sealed class. 44 | 45 | ```dart 46 | @Sealed([Failure, Success]) 47 | abstract class Result {} 48 | 49 | class Failure implements Result { 50 | final String errorMessage; 51 | 52 | Failure(this.errorMessage); 53 | } 54 | 55 | class Success implements Result { 56 | final String data; 57 | 58 | Success(this.data); 59 | } 60 | ``` 61 | 62 | The complete file should now look like this: 63 | 64 | ````dart 65 | import 'package:sealed_class/sealed_class.dart'; 66 | 67 | part 'yourfilename.g.dart'; 68 | 69 | @Sealed([Failure, Success]) 70 | abstract class Result {} 71 | 72 | class Failure implements Result { 73 | final String errorMessage; 74 | 75 | Failure(this.errorMessage); 76 | } 77 | 78 | class Success implements Result { 79 | final String data; 80 | 81 | Success(this.data); 82 | } 83 | ```` 84 | 85 | To make it compile run the following command in the terminal: 86 | 87 | ```shell script 88 | flutter packages pub run build_runner build --delete-conflicting-outputs 89 | ``` 90 | 91 | You can do: 92 | 93 | ```dart 94 | void main() { 95 | final someResult = Success("Woohoo Sealed classes in Dart"); 96 | someResult.continued( 97 | (failure) { 98 | print("Oh no it failed with errorMessage: ${failure.errorMessage}"); 99 | }, 100 | (success) { 101 | print(success.data); 102 | }, 103 | ); 104 | 105 | //Or if you want to reduce it to another value use `join` 106 | final someOtherResult = Failure("Some Error Message"); 107 | final mapResult = someOtherResult.join( 108 | (failure) => failure.errorMessage, 109 | (success) => success.data, 110 | ); 111 | print(mapResult); 112 | } 113 | ``` 114 | -------------------------------------------------------------------------------- /sealed_class_generator/build.yaml: -------------------------------------------------------------------------------- 1 | targets: 2 | $default: 3 | builders: 4 | sealed_class_generator|sealed_class: 5 | enabled: true 6 | 7 | builders: 8 | sealed_class: 9 | target: ":sealed_class_generator" 10 | import: "package:sealed_class_generator/sealed_class_generator.dart" 11 | builder_factories: ["sealedClassBuilder"] 12 | build_extensions: {".dart": [".sealed_class.g.part"]} 13 | auto_apply: dependents 14 | build_to: cache 15 | applies_builders: ["source_gen|combining_builder"] -------------------------------------------------------------------------------- /sealed_class_generator/lib/sealed_class_generator.dart: -------------------------------------------------------------------------------- 1 | import 'package:build/build.dart'; 2 | import 'package:sealed_class_generator/src/gen.dart'; 3 | import 'package:source_gen/source_gen.dart'; 4 | 5 | Builder sealedClassBuilder(BuilderOptions options) => 6 | SharedPartBuilder([SealedGenerator()], 'sealed_gen'); 7 | -------------------------------------------------------------------------------- /sealed_class_generator/lib/src/checker.dart: -------------------------------------------------------------------------------- 1 | class Checker { 2 | static void checkInputValidity( 3 | String className, 4 | List typeParams, 5 | ) { 6 | if ((className?.isEmpty ?? true) == true) { 7 | throw "Could not determine the `className.`"; 8 | } 9 | 10 | if (typeParams.isEmpty || typeParams.length <= 1) { 11 | throw "You should have more than one type parameter."; 12 | } 13 | } 14 | } 15 | -------------------------------------------------------------------------------- /sealed_class_generator/lib/src/common.dart: -------------------------------------------------------------------------------- 1 | const typeParam = "R"; 2 | -------------------------------------------------------------------------------- /sealed_class_generator/lib/src/gen.dart: -------------------------------------------------------------------------------- 1 | import 'dart:async'; 2 | 3 | import 'package:analyzer/dart/element/element.dart'; 4 | import 'package:build/build.dart'; 5 | import 'package:sealed_class/sealed_class.dart'; 6 | import 'package:source_gen/source_gen.dart'; 7 | 8 | import 'checker.dart'; 9 | import 'printer.dart'; 10 | import 'transformer.dart'; 11 | import 'visitor.dart'; 12 | 13 | class SealedGenerator extends GeneratorForAnnotation { 14 | @override 15 | FutureOr generateForAnnotatedElement( 16 | Element element, 17 | ConstantReader annotation, 18 | BuildStep buildStep, 19 | ) { 20 | final typeParams = annotation.objectValue 21 | .getField("types") 22 | .toListValue() 23 | .map((dartObj) => dartObj.toTypeValue()) 24 | .map((type) => type.name) 25 | .toList(); 26 | 27 | final visitor = SealedClassVisitor(); 28 | element.visitChildren(visitor); 29 | 30 | Checker.checkInputValidity(visitor.className, typeParams); 31 | 32 | final typeParameterData = 33 | TypeParameterTransformer.toGeneratedCodeData(typeParams); 34 | final printerOutput = 35 | Printer.constructOutput(visitor.className, typeParameterData); 36 | 37 | return printerOutput.toString(); 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /sealed_class_generator/lib/src/printer.dart: -------------------------------------------------------------------------------- 1 | import 'common.dart'; 2 | import 'transformer.dart'; 3 | 4 | class PrinterOutput { 5 | final String _sealedClassName; 6 | final String _continuedStatement; 7 | final String _joinStatement; 8 | 9 | PrinterOutput( 10 | this._sealedClassName, 11 | this._continuedStatement, 12 | this._joinStatement, 13 | ); 14 | 15 | @override 16 | String toString() => (StringBuffer() 17 | ..writeln("extension ${_sealedClassName}Ext on $_sealedClassName {") 18 | ..writeln(_continuedStatement) 19 | ..writeln(_joinStatement) 20 | ..writeln("}")) 21 | .toString(); 22 | } 23 | 24 | class Printer { 25 | static const _continuedMethodName = "continued"; 26 | static const _joinMethodName = "join"; 27 | 28 | Printer._(); 29 | 30 | static PrinterOutput constructOutput( 31 | final String className, 32 | final Iterable typeParamData, 33 | ) { 34 | String continuedStatement(final Iterable typeParamData) { 35 | String continuedTypeCheckStatement( 36 | final Iterable typeParamData) { 37 | final caseBuffer = StringBuffer(); 38 | typeParamData.forEach((it) { 39 | caseBuffer 40 | ..writeln("if (this is ${it.type}) {") 41 | ..writeln(it.continuedFunction) 42 | ..writeln("}"); 43 | }); 44 | return caseBuffer.toString(); 45 | } 46 | 47 | return (StringBuffer() 48 | ..write("void $_continuedMethodName(") 49 | ..writeln() 50 | ..writeln(typeParamData 51 | .map((it) => it.continuedFunctionDeclaration) 52 | .join(",\n")) 53 | ..writeln(",) {") 54 | ..writeln(continuedTypeCheckStatement(typeParamData)) 55 | ..writeln("}")) 56 | .toString(); 57 | } 58 | 59 | String joinStatement(final Iterable typeParamData) { 60 | String joinTypeCheckStatement( 61 | final Iterable typeParamData) { 62 | final caseBuffer = StringBuffer(); 63 | typeParamData.forEach((it) { 64 | caseBuffer 65 | ..writeln("if (this is ${it.type}) {") 66 | ..writeln("r = ${it.joinFunction}") 67 | ..writeln("}"); 68 | }); 69 | return caseBuffer.toString(); 70 | } 71 | 72 | return (StringBuffer() 73 | ..write("$typeParam $_joinMethodName<$typeParam>(") 74 | ..writeln() 75 | ..writeln(typeParamData 76 | .map((it) => it.joinFunctionDeclaration) 77 | .join(",\n")) 78 | ..writeln(",) {") 79 | ..writeln("$typeParam ${typeParam.toLowerCase()};") 80 | ..writeln(joinTypeCheckStatement(typeParamData)) 81 | ..writeln("return ${typeParam.toLowerCase()};") 82 | ..writeln("}")) 83 | .toString(); 84 | } 85 | 86 | return PrinterOutput( 87 | className, 88 | continuedStatement(typeParamData), 89 | joinStatement(typeParamData), 90 | ); 91 | } 92 | } 93 | -------------------------------------------------------------------------------- /sealed_class_generator/lib/src/transformer.dart: -------------------------------------------------------------------------------- 1 | import 'common.dart'; 2 | 3 | class GeneratedCodeData { 4 | static const continuedMethodName = "continuation"; 5 | static const joinMethodName = "join"; 6 | 7 | final String type; 8 | 9 | final String continuedFunction; 10 | final String continuedFunctionDeclaration; 11 | 12 | final String joinFunction; 13 | final String joinFunctionDeclaration; 14 | 15 | GeneratedCodeData(this.type) 16 | : continuedFunction = "$continuedMethodName$type(this);", 17 | continuedFunctionDeclaration = 18 | "Function($type) $continuedMethodName$type", 19 | joinFunction = "$joinMethodName$type(this);", 20 | joinFunctionDeclaration = 21 | "$typeParam Function($type) $joinMethodName$type"; 22 | } 23 | 24 | class TypeParameterTransformer { 25 | TypeParameterTransformer._(); 26 | 27 | static List toGeneratedCodeData(final List typeParameters) => 28 | typeParameters.map((it) => GeneratedCodeData(it)).toList(growable: false); 29 | } 30 | -------------------------------------------------------------------------------- /sealed_class_generator/lib/src/visitor.dart: -------------------------------------------------------------------------------- 1 | import 'package:analyzer/dart/element/element.dart'; 2 | import 'package:analyzer/dart/element/visitor.dart'; 3 | 4 | class SealedClassVisitor extends SimpleElementVisitor { 5 | String className = null; 6 | 7 | @override 8 | visitConstructorElement(ConstructorElement element) => 9 | className = element.type.returnType.name; 10 | } 11 | -------------------------------------------------------------------------------- /sealed_class_generator/pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: sealed_class_generator 2 | description: Sealed Class generator parses and generates your sealed classes. 3 | version: 3.0.0 4 | homepage: https://github.com/vrtdev/sealed_class_generator 5 | repository: https://github.com/vrtdev/sealed_class_generator 6 | issue_tracker: https://github.com/vrtdev/sealed_class_generator/issues 7 | 8 | environment: 9 | sdk: ">=2.6.0 <3.0.0" 10 | 11 | dependencies: 12 | analyzer: ^0.39.1 13 | build: ^1.2.1 14 | source_gen: ^0.9.4+6 15 | sealed_class: 16 | path: ../sealed_class 17 | 18 | dev_dependencies: 19 | build_test: ^0.10.9+1 20 | build_runner: ^1.7.1 21 | test: ^1.9.3 22 | 23 | dependency_overrides: 24 | sealed_class: 25 | path: ../sealed_class/ 26 | -------------------------------------------------------------------------------- /sealed_class_generator/test/printer_test.dart: -------------------------------------------------------------------------------- 1 | import 'package:sealed_class_generator/src/printer.dart'; 2 | import 'package:sealed_class_generator/src/transformer.dart'; 3 | import 'package:test/test.dart'; 4 | 5 | void main() { 6 | group("Printer", () { 7 | final printerOutput = Printer.constructOutput( 8 | "MySealedClass", 9 | [ 10 | GeneratedCodeData("A"), 11 | GeneratedCodeData("B"), 12 | ], 13 | ); 14 | 15 | group("complete output", () { 16 | test("should match", () { 17 | expect( 18 | printerOutput.toString(), 19 | """ 20 | extension MySealedClassExt on MySealedClass { 21 | void continued( 22 | Function(A) continuationA, 23 | Function(B) continuationB 24 | ,) { 25 | if (this is A) { 26 | continuationA(this); 27 | } 28 | if (this is B) { 29 | continuationB(this); 30 | } 31 | 32 | } 33 | 34 | R join( 35 | R Function(A) joinA, 36 | R Function(B) joinB 37 | ,) { 38 | R r; 39 | if (this is A) { 40 | r = joinA(this); 41 | } 42 | if (this is B) { 43 | r = joinB(this); 44 | } 45 | 46 | return r; 47 | } 48 | 49 | } 50 | """, 51 | ); 52 | }); 53 | }); 54 | }); 55 | } 56 | -------------------------------------------------------------------------------- /sealed_class_generator/test/transformer_test.dart: -------------------------------------------------------------------------------- 1 | import 'package:sealed_class_generator/src/transformer.dart'; 2 | import 'package:test/test.dart'; 3 | 4 | void main() { 5 | group("Type Parameter Transformer", () { 6 | group("to generated code data", () { 7 | final generatedCodeData = 8 | TypeParameterTransformer.toGeneratedCodeData(["A"]).first; 9 | 10 | group("continued function", () { 11 | test("should have the correct continued function", () { 12 | expect(generatedCodeData.continuedFunction, "continuationA(this);"); 13 | }); 14 | 15 | test("should have the correct continued function declaration", () { 16 | expect(generatedCodeData.continuedFunctionDeclaration, 17 | "Function(A) continuationA"); 18 | }); 19 | }); 20 | 21 | group("folding function", () { 22 | test("should have the correct fold function", () { 23 | expect(generatedCodeData.joinFunction, "mapA(this);"); 24 | }); 25 | 26 | test("should have the correct fold function declaration", () { 27 | expect( 28 | generatedCodeData.joinFunctionDeclaration, "R Function(A) mapA"); 29 | }); 30 | }); 31 | }); 32 | }); 33 | } 34 | --------------------------------------------------------------------------------