SO, i forgot to implement nud and led correctly and the parser cant tell
apart from - as unary and - as binary (+ as well), i need to correct
that, move Node * to TreeResult so to use NodeResult with nud and led
DAMN, it wasn't that difficult, just bothers me a bit the part that
checks if both lbp and rbp of the infix are valid, like i do validation
twice but is fine i guess, maybe using an else?, i'll see if i change
it, for now i need to change the evaluator
So i did what the last commit said, also fixed parse_expr because it was
still using malloc for allocating new nodes so i made it use arena_alloc
like it should, did the very first tests so it's all good, i think is
readdy to merge.
For now it works but i dont really like that i use ParseResult, i mean
is necessary but i think i will try to make it cleaner so that i can
just directly use like parse and pass tath into evaluate, that would
require to move the main evaluate funciton into evaluate_tree or
something and evaluate takes the arena, uses evaluate_tree and frees
the arena, will try that the next commit but for now this version works
perfectly.
