json-scratch

json-scratch.js

(function(Scratch) {
  'use strict';

  class Json2Scratch {
    getInfo () {
      return {
        id: 'parse',
        name: 'Parse',
        blocks: [
          {
            opcode: 'parse',
            blockType: Scratch.BlockType.REPORTER,
            text: 'JSON parse [JSON] of [PATH]',
            arguments: {
              JSON: {
                type: Scratch.ArgumentType.STRING,
                defaultValue: '{"a":["b","c"]}'
              },
              PATH: {
                type: Scratch.ArgumentType.STRING,
                defaultValue: 'a.0'
              }
            }
          }
        ]
      };
    }

    parse(args){
      try{
        const json=JSON.parse(args.JSON);
        const path=args.PATH.split(".");
        
        let value=json;
        for(const locate of path){
          value=value[locate];
        }
        return value;
      }catch{return "NaN"}
    }
  }

  Scratch.extensions.register(new Json2Scratch());
})(Scratch);