Lox interpreter implemented in Zig

Complete

This is the implementation of the Lox interpreter explained in this book: http://craftinginterpreters.com/contents.html but in Zig.

I'm writing it while following the book.

Status

• Part2 (A Tree-Walk Interpreter) is complete!

  • NOTE: With the introduction of closures I implemented a reference counting system to free the closures and the variables in those closures when appropiate. With the introduction of classes, I should have implemented a reference counting system of that as well to free variables at the right moment, but I had already found it cumbersome for closures, and I believed there were edge cases in the closures implementation that would give memory leaks. I believe the proper way to free resources in a dynamic language is by using a garbage collector. Part 2 in the book is implemented with Java, which already has a garbage collector. And part 3 is implemented in C and a garbage collector is implemented as well. Since I did part2 in Zig, which doesn't have a garbage collector, I'm OK with having memory leaks (which can be fixed by implementing a garbage collector explained in part 3).

• Part3 is complete!

  • This implementation should be sound and should not leak any memory, unlike my implementation of Part2 :)