BrainFuck -> x86 Assembly

import sys

BF_PROGRAM = ""
ASM_PROGRAM = ""
ASM_INCLUDE_COMMENTS = True
ASM_INCLUDE_IO = True

if (len(BF_PROGRAM) == 0):
    #no program when ran...
    #wait for one from stdin (either pipe or keyboard)
    #stop accepting lines after reads a line with just a newline
    try:
        while 1:
            try:
                line = sys.stdin.readline()
            except KeyboardInterrupt:
                break
            if (line.find("\n") != -1):
                if (line.index("\n") == 0):
                    break
            BF_PROGRAM += line
    except:
        print "NO BF PROGRAM GIVEN!"
        exit(0)

ASM_PROGRAM += "global _main\n"
ASM_PROGRAM += "extern  _putch\n"
ASM_PROGRAM += "extern  _getch\n\n"
ASM_PROGRAM += "section .text\n_main:\n\n"

ASM_PROGRAM += "mov eax, 0\n"
ASM_PROGRAM += "mov ebx, 0\n"
ASM_PROGRAM += "mov ecx, 0\n"
ASM_PROGRAM += "mov edx, 0\n\n"

if (ASM_INCLUDE_COMMENTS):
    ASM_PROGRAM += "; MEMORY STARTS AT EAX\n"
ASM_PROGRAM += "mov eax, [MEMORYCELLS]\n\n" #memory

#BF_PUTCHAR function (get char from EDX)
ASM_PROGRAM += "BF_PUTCHAR:\n"
if (ASM_INCLUDE_IO):
    ASM_PROGRAM += "push eax\n"
    ASM_PROGRAM += "push ebx\n"
    ASM_PROGRAM += "push ecx\n"
    ASM_PROGRAM += "push edx\n"
    ASM_PROGRAM += "pushf\n"
    ASM_PROGRAM += "push "
    ASM_PROGRAM += "call _putch\n"
    ASM_PROGRAM += "add esp, 4\n"
    ASM_PROGRAM += "popf\n"
    ASM_PROGRAM += "pop edx\n"
    ASM_PROGRAM += "pop ecx\n"
    ASM_PROGRAM += "pop ebx\n"
    ASM_PROGRAM += "pop eax\n"
ASM_PROGRAM += "ret\n\n"

#BF_GETCHAR function (return char to EDX)
ASM_PROGRAM += "BF_GETCHAR:\n"
if (ASM_INCLUDE_IO):
    ASM_PROGRAM += "push eax\n"
    ASM_PROGRAM += "push ebx\n"
    ASM_PROGRAM += "push ecx\n"
    ASM_PROGRAM += "pushf\n"
    ASM_PROGRAM += "call _getch\n"
    ASM_PROGRAM += "mov edx, eax\n"
    ASM_PROGRAM += "add esp, 4\n"
    ASM_PROGRAM += "popf\n"
    ASM_PROGRAM += "pop ecx\n"
    ASM_PROGRAM += "pop ebx\n"
    ASM_PROGRAM += "pop eax\n"
else:
    ASM_PROGRAM += "mov edx, 255\n"
ASM_PROGRAM += "ret\n\n"

lookup = {
    '>' : "inc eax\n\n",
    '<' : "dec eax\n\n",
    '+' : "mov ebx, [eax]\ninc ebx\nmov [eax], ebx\n\n",
    '-' : "mov ebx, [eax]\ndec ebx\nmov [eax], ebx\n\n",
    '.' : "mov edx, [eax]\ncall BF_PUTCHAR\n\n",
    ',' : "call BF_GETCHAR\nmov [eax], edx\n\n",
    '[' : "BF_WHILE_$(RAND):\nmov ebx, [eax]\ncmp ebx, 0\nje BF_WHILE_END_$(RAND)\n\n",
    ']' : "jmp BF_WHILE_$(LRAND)\nBF_WHILE_END_$(LRAND):\n\n",
}

namestack = []
namerng = 0

if (ASM_INCLUDE_COMMENTS):
    ASM_PROGRAM += "; ACTUAL BF PROGRAM STARTS HERE\n\n"

for c in BF_PROGRAM:
    if (lookup.has_key(c)):
        result = lookup[c]
        if (result.find("$(RAND)") != -1):
            namestack += [namerng]
            result = result.replace("$(RAND)", str(namerng))
            namerng += 1
        if (result.find("$(LRAND)") != -1):
            result = result.replace("$(LRAND)", str(namestack.pop()))
        if (ASM_INCLUDE_COMMENTS):
            ASM_PROGRAM += "; COMMAND '%c'\n" % c
        ASM_PROGRAM += result

ASM_PROGRAM += "\nMEMORYCELLS:\ndb 0\n"

print "; ========================================\n"
print "; CREATE WITH BF2ASM.PY\n"
print "; ========================================\n"
print ASM_PROGRAM

exit(0)