Get value type in code generator

[Bart Butenaers]

Hi everybody,

My node allows for input a String, Number or Buffer:

Blockly.Blocks['buffer_set_index'] = {

    init: function () {

        this.jsonInit({

            "type": "buffer_set_index",

            "message0": "%1",

            "args0": [

                {

                    "type": "input_value",

                    "name": "VALUE",

                    "check": ["Number", "String", "Buffer"]

                }

            ],

            "inputsInline": true,

            "previousStatement": null,

            "nextStatement": null

        });

    }

};

In my code generator, I would like to know to which data type my input is connected.

For example in this case it is connected to a Number:

How can I get the data type in my code generator, to generate code based on the data type:

Blockly.JavaScript['buffer_set_index'] = function(block) {

    const value = Blockly.JavaScript.valueToCode(block, 'VALUE', Blockly.JavaScript.ORDER_ATOMIC);

   dataType = ?????????????????????????????????

   switch (dataType) {

       case "Number":

            code = ...

            break;

        case "String":

             code = ...

             break;

         case "Buffer":

              code = ...

              break;

     }

  return code;

}

Could I use the following info to implement it perhaps:

Thanks!!

Bart

};

[Aaron Dodson]

I think your idea will work, at least in the simple case. Depending on the values and your exact application, it might also work to examine the value you get back from valueToCode() and see if it e.g. parses as a number; OTOH if you're wanting to enforce a type system based on the connected blocks that would of course break down if something entered "5" in a text block.

[Bart Butenaers]

Hi Aaron,

Thanks for sharing your thoughts with me!

The string "5" is indeed an edge case I will need to look at.  Good catch!

Kind regards,

Bart