Data validation

[y9vad9]

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 ...
  

Originally posted by @y9san9 in https://github.com/y9vad9/implier/issues/1#issuecomment-984492558