LoxTreeWalkInterpreter

I am reading Crafting Interpreters by Robert Nystrom This is an implementation of the first interpreter in C++

Syntax Overview

Variable declaration and assignment

var x = 5;
var y;  // Sets to null
y = 4;

Control flow

if (condition) {
  // statement body
} else {
  // optional else clause
}

while (condition) {
  // statement body
}

for (init; condition; increment) {
  // statement body
} 

Functions

fun myFunction(arg1, arg2) {
  // do stuff
}

// function call
myFunction(x, y);

Classes

class Car {
  //python-style initializer function
  init(color) {
    this.color = color
  }
}

myCar = Car("green");
print myCar.color;   //green

Recursive Fibonacci example

fun fib(n) {
  if (n <= 0) return 0;
  if (n == 1 or n == 2) return 1;
  return fib(n - 1) + fib(n - 2);
}