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A code generator for algebraic data types such as data classes and discriminated unions.

Algebraic data types #

A code generator for algebraic data types such as data classes and discriminated unions.

Getting Started #

You should install three packages as dependencies:

dependencies:
  adt_annotation: ^0.1.0

dev_dependencies:
  adt: ^0.1.0
  build_runner: ^1.10.0

Then, in the file for which you want to generate the code, add the following:

import 'package:adt_annotation/adt_annotation.dart';

part 'your_file_name.g.dart';

@data
class User with _$User {
  final String name;
  final int age;

  const User(this.name, this.age)
      : assert(name != null),
        assert(age != null);
}

@union
class Status {
  const factory Status.normal() = _$Status.normal;
  const factory Status.vip(String id) = _$Status.vip;
}

Finally, run the generator by writing at the command prompt flutter pub run build_runner build for Flutter project, or pub run build_runner build for other projects. See build_runner for more details.

Now there is a bug in the analyzer, to fix it, add the following to your analysis_options.yaml.

analyzer:
  errors:
    const_constructor_with_mixin_with_field: ignore

Data class #

The data class сontains fields that are used in ==, hashCode, toString, copyWith which it creates for you. == and hashCode allow to compare objects as values, toString gives you a string representation of this object, copyWith method allows you to create a copy of an object with the ability to change fields values. You can always manually override them if you want.

To create an immutable data class, use the @data annotation on DataClassName with _$DataClassName and add a constructor with some parameters, which if you need a private data class use the following _DataClassName with _$_DataClassName. If a data class or constructor is private, then the _copyWith will also be private. To use more than one constructor, add @primary to one of them, and its parameters will be used to generate the data class.

You can place the fields corresponding to the constructor parameters either in the data class itself, or inherit them from somewhere. But in any case, the constructor parameters must have the same names as the corresponding fields, these parameters and fields must be public, and only they will be used inside ==, hashCode, toString, copyWith. The constructor must contain at least one parameter. Add @nullable annotation to make a field nullable. This also is necessary for a copyWith method to work properly in order to be able to set the value of a nullable field to null. If you need to use mutable fields or your data class inherits another class that contains mutable fields than add the @mutable annotation. This will remove the @immutable annotation from the created mixin _$DataClassName.

You can freely apply generics to your DataClassName<T> with _$DataClassName<T> and also add any other members to a data class, such as other fields, methods, etc. You can also inherit, implement, and use mixins.

Example

Union #

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A code generator for algebraic data types such as data classes and discriminated unions.

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License

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Dependencies

adt_annotation, analyzer, build, code_builder, dart_style, meta, source_gen

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