function prepareParsing( mt )
      // ... rip uniteresting code...

      // we get the sw code, that is our Switch syntactic tree.
      sw = self.prepareSwitch( self.nilStates, "state" )

      // we create a parametric syntree using the {() ...} expression, that
      // is similar to {[] ... } but for the fact that it wraps the code in
      // a prefix that will assign the symbols during the evaluation.
      // The switch here is placed by unescape; that means, it is inserted
      // in the below code with the value it has NOW in this function.
      // however, it's still a VALUE;
      // There are two ways to make it being executed in the following code,
      // 1) add each step in sw tree into func
      // 2) more simply, evaluate the switch code via () evaluation.
      // in short, the switch on the "state" symbol we created via prepareSwitch
      // and that references a "text" symbol in some part, will be evaluated in
      // the context of the following parametric code, when someone will invoke
      // func('something'), or better, mt.onText( 'something' )
      func = {(text) state = ^~self.currentState(); tree = nil; ^~sw() }
      mt.onText = func

   end