dudupopkhadze / typescript-lox-interpreter

Typescript implementation of lox interpreter

TSLox -> TypeScript Lox Interpreter

Lox is a simple dynamically typed programming language with a static scope, built-in clock and many more good features.

TSLox is a simple interpreter built from scratch using TS.

Running Lox

• clone this repo
• run npm install
• run npm run start or `npm run start FULL/PATH/TO/test.lox" if you want to interpret code from a file

Lox Description

Rules:

• just use semicolons, otherwise ur golden :)

Lox can print anything you want

  print 5;
  // outputs 5

Full support of arithmetic operations

  print 5 + 3;
  // outputs 8

Variables

  var a;
  var b = "string";
  var c = 5;
  var d = a;

Functions

  fun add(a, b) {
    return a + b;
  }

  var x = 5;
  var y = 10;

  print add(x, y); // 15

For Loop

  for (var i = 0; i < 20; i = i + 1) {
    print i;
  }

While Loop

  var i = 0;
  while(i < 20){
    print i;
    i = i + 1;
  }

Branches

  fun sayHello(name){
    if(name == "kevin"){
        print "Not to you kevin";
    } else {
        print "Hey " + name;
    }
  }

  sayHello("Lebron");
  // outputs "Hey Lebron"
  sayHello("kevin");
  // outputs "Not to you kevin"

Recursion

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

  for (var i = 0; i < 20; i = i + 1) {
    print fib(i);
  }

Clock

  var time = clock();
  print time;
  //outputs same as Date.now()

Closures

  fun makeCounter() {
    var i = 0;
    fun count() {
        i = i + 1;
        print i;
    }
    return count;
  }

  var counter = makeCounter();
  counter(); // "1".
  counter(); // "2"
  counter(); // "3"
  counter(); // "4"