String Constraint on compilation => abstract (?)

[Théo Sabattié]

Hi everyone ! 

I would like setup a type of string with a regex constraint:

~/[A-Z]*[0-9]*/i

("A1", "E2", "DA19", etc...)

I would like check validity on compilation.

I suppose we can do that with abstract type but I am not sure.

I tried that :

abstract Address(String) to String

{

    inline function new(s:String) {

        this = s;

    }

    

    @:from

    static public function fromString(s:String) {

        if (!~/[A-Z]*[0-9]*/i.match(s)) {

           throw "Invalid adress"; 

        }

        

        return new Address(s);

    }

}

But it doesn't work at compilation.

Someone have an idea?

Thanks,

Théo Sabattié.

[Cambiata]

I guess it's a regex problem - '+' instead of '*' would restrict to 'one or many'.
Try this one, based on http://code.haxe.org/category/abstract-types/emailaddress.html

abstract Address(String) to String {
  static var ereg = ~/[A-Z]+[0-9]+/i;
  inline public function new(address:String) {
    if (!ereg.match(address)) throw 'Address "$address" is invalid';
    this = address;
  }

  @:from inline static public function fromString(address:String) {
    return new Address(address);
  }
}

The regex can be static - instantiated once instead of at every run.

Jonas

[Théo Sabattié]

Thanks Cambiata,

I search to check validity on compilation // in IDE. 

Currently that works on runtime.

Do you know any meta build or other thing to do that?

Théo.

[Jonas Malaco Filho]

You could try using a macro @:from function: http://try-haxe.mrcdk.com/#0fbeF

Hope that helps...

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[Théo Sabattié]

Great ! Thanks a lot Jonas! :)