clox

Lox(well, not really) Interpreter in C++

Background

This is a learning project for Crafting interpreters.

I'm not actully implementing the authentic Lox. I adopted it according to my likes.

Lox is a language that is very similar to C, but with dynamic types. Let's see an example.

// calculate the greatest common divisor
function gcd(a, b) {
  if (b == 0) return a;
  while (a >= b) a = a - b;
  return gcd(b, a);
}

print gcd(99, 121);
assert gcd(99, 121) == 11;

After implementing basic functions for clox, I moved out to a C compiler, cppc, which is actually a fork of clox, but with lots of cleaning up and improvement.

The visitor pattern used here can be improved, and it's properly done in cppc.

Roadmap

• basic lexer
• basic parser
• +,-,*,/,=,==,!=,<,>,<=,>=,(,)
• +=, -=, *=, /=
• support ++, --. but no ----a bullshit! theses ops return rvalue
• print statement
• expr statement
• var declartion
• block scoping
• for, while block
• branch
• assert statement
• testing the language with itself (built-in assert)! see ./tests
• no continue! i'm lazy
• break
• function
• return (can run gcd now!)
• error recover
• no local function or closure! i don't like it