bf2c.py

import sys
import subprocess

bf2c = {">": "INCD()",  #increment data pointer \
        "<": "DECD()",  #decrement data pointer \
        "+": "INC()",   #increment byta at data pointer \
        "-": "DEC()",   #decrement byta at data pointer \
        ".": "PRINT()", #output byte at data pointer \
        ",": "IN()",    #store input at data pointer \
        "[": "JUMPF()", #jump forward to ] if zero \
        "]": "JUMPB()"} #jump backward to [ if nonzero

def balanced_parens(s):
    parens = []
    s = s.read()
    for i, l in enumerate(s):
        if l == "[":
            parens.append(i)
        elif l == "]":
            try:
                parens.pop()
            except IndexError:
                return False
    if parens:
        print("Unbalanced parenthesis at {}".format(parens.pop()))
        return False
    return True

with open(sys.argv[1]) as src, open("bf.c", "w") as outp:
    if not balanced_parens(src):
        sys.exit("Unbalanced parentheses.")
    src.seek(0)
    for n, line in enumerate(src):
        outp.write("#line " + str(n) + '"%s"\n'%sys.argv[1])
        for l in line:
            if l in bf2c:
                outp.write(bf2c[l] + "\n")

subprocess.call(["gcc", "-g", "-O2" , "bf_runtime.c", "-o", "bf"])