morning pre-coffee kata

bf.py

registers = {
    'pointer' : 0,
    'ip' : 0,
    }
space = [0]*30000
program =[]

import sys
def inc_p():
    registers['pointer'] += 1
def dec_p():
    registers['pointer'] -= 1
def inc_v():
    space[registers['pointer']] += 1
def dec_v():
    space[registers['pointer']] -= 1
def out():
    sys.stdout.write(chr(space[registers['pointer']]))
    sys.stdout.flush()
def inp():
    space[registers['pointer']] = ord(sys.stdin.read(1))
def jump_zero():
    if space[registers['pointer']] == 0:
        while not program[registers['ip']] == "]":
            registers['ip'] += 1
def loop():
    while not program[registers['ip']] == "[":
        registers['ip'] -= 1
    registers['ip'] -= 1

instr = {
    '>' : inc_p,
    '<' : dec_p,
    '+' : inc_v,
    '-' : dec_v,
    '.' : out,
    ',' : inp,
    '[' : jump_zero,
    ']' :loop
}

program = open(sys.argv[1]).read().strip()

while registers['ip'] < len(program) :
    if program[registers['ip']] in instr:
        instr[program[registers['ip']]]()
    registers['ip'] += 1