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