New codegeneration annotations

[y9vad9]

I think it will be necessary to create something like @DSLImpl and simple java-styled builder @BuilderImpl codegenerations.

[y9vad9]

also maybe it would be good if we have factory-function generation to hide mutable / immutable realization where type clarifying is not necessary. I mean next:

@FactoryFunctionImpl
@ImmutableImpl
interface Foo {
   val value: String
}

will generate next:

fun Foo(value: String): Foo = ImmutableFoo(value)

[y9san9]

Nice ideas, especially with DSLs, I'm really interested in. So can you propose how the DSLs generation may look like?

The cases I want to be covered:

• simple dsl generation
• DSL generation with check support (e.g.: if username less than 5 symbols → throw an exception)
• DSL finalization:

      class DSLScope {
          var variable: String = "" // do not forget to pass the default value
          var variable2: Int = 0  // do not forget to pass the default value
          
          fun state(): DSLScopeState = DSLScopeState(variable, variable2)
      }
      class DSLScopeState(val variable: String, val variable2: Int)

[y9san9]

The most complex thing here is how to design validators.
I see three ways:

• (Not convenient for me, but still the way) design it with notations and annotations:

  // object here is notation, we assuming that user will
  // create object here, but not class. Anyway this will
  // be checked at compile time
  object NameValidator : Validator<String> {
      override fun validate(value: String): Boolean = ...
  }
  
  @Validate(NameValidator::class)
  val name: String = ""

• (Not convenient for me, but still the way) design it with function name notations:

  var name: String = ...
  fun _checkName_(): Boolean = ...

  Transformed to →

  private var _name: String
  var name: String get() = _name set() = if(/* code from _checkName_() */) ... else ...

• (Now I'm looking forward this) Wrap it with a type:

  val name: Validate<String> = Validate(default = ...) { name -> require(name.length in 1..30) { "Provide a correct name" } }

  Transformed to →

  var _name: String = default
  var name get() = _name set() = if(/* code from name.validate() */) ... else ...

[y9vad9]

I moved data validation discussion to a new issue #2