Switch parser using Lark

This project was an assignment for the NLP class at University of Siena.

Assignment

Using lark implement a parser for managing the switch statement in a simplified version.

the variable used in the switch is one integer variable in a predefined set of two variables x, y.
the values to x, y are assigned before the if statement (assume 0 if there is no assignment)

the switch instruction has the following syntax

switch(var) {
  case 0: z=cost0;
          break;

   ...
  case N: z=costN;
          break;

  default: z=costD;
          break;
}

the instruction contains only the assignment of a constant value to the variable z
at the end print the value of the variable z