branfinch.py

import itertools as i
import sys


def main():

    with open("test.pr", 'r') as f:
        n = int(f.read(1))

        crystal = {"".join(s) : 0 for s in i.product("01", repeat=n)}
        cursor = "0"*n
        jump = 1

        while True:
            c = f.read(1)

            if c == ">" or c == "<":
                shift = 0
                p = f.tell()
                while f.read(1) == c: shift +=1
                f.seek(p+shift)

                b = "1" if c == ">" else "0"
                cursor = cursor[:shift]+b+cursor[shift+1:]

            elif c == "|":
                shift = 0
                p = f.tell()
                while f.read(1) == c: shift +=1
                f.seek(p+shift)

                b = cursor[shift]
                b = "1" if b == "0" else "0"
                cursor = cursor[:shift]+b+cursor[shift+1:]

            elif c == "[":
                jump = f.tell()
                if crystal[cursor] == 0:
                    while f.read(1) != "]": pass
                print("[! jump:",jump)

            elif c == "]":
                if crystal[cursor] != 0:
                    f.seek(jump-1)
                print("]! jump:",jump)

            elif c == "+":
                crystal[cursor] += 1

            elif c == "-":
                crystal[cursor] -= 1

            elif c == ",":
                crystal[cursor] = ord(input('')[0])

            elif c == ".":
                print(chr(crystal[cursor]))


            if not c:
                break

if __name__ == '__main__':
    main()