Lox

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Lox

Designed by	Robert Nystrom
Appeared in	2015
Computational class	Turing-complete
Reference implementation	jlox clox
Major implementations	Implement it yourself!

Lox is a pedagogical programming language designed to be implemented by students of compiler theory. It was introduced in the book Crafting Interpreters.

Examples

Hello, world! program

print "Hello, world!";

Looping counter

var string = "";
while (true) {
  string = string + "*";
  print string;
}

FizzBuzz

fun modulo(a, b) {
  var k = 0;
  while (a - k * b >= b) {
    k = k + 1;
  }
  return a - k * b;
}
var counter = 1;
while (counter < 20) {
  var fizz = false;
  var buzz = false;
  if (modulo(counter, 3) == 0) {
    fizz = true;
  }
  if (modulo(counter, 5) == 0) {
    buzz = true;
  }
  if (fizz and buzz) {
    print "FizzBuzz";
  } else if (fizz) {
    print "Fizz";
  } else if (buzz) {
    print "Buzz";
  } else {
    print(counter);
  }
  counter = counter + 1;
}

Self-interpreter

See here. Note that they use modified versions of Lox as the book version does not have many basic facilities such as input.

See also

• Monkey