#! /usr/bin/env python
"""
Pi In Bf interpreter
@author stranjo and thotypous
"""
import sys, random
def bf(string):
dpointer = pointer = 0
plist = [0]*3000
stack = []
string = list(string)
while pointer < len(string):
if pointer == 0:
stack.append(-1)
#sys.stderr.write("parsing: %s\n"%string[pointer])
if string[pointer] == '+':
plist[dpointer] +=1
plist[dpointer] &= 0xFF
elif string[pointer] == '-':
plist[dpointer] -= 1
plist[dpointer] &= 0xFF
elif string[pointer] == '>':
dpointer += 1
elif string[pointer] == '<':
dpointer-=1
if dpointer < 0: dpointer = 0
elif string[pointer] == ']':
pointer = stack.pop()
elif string[pointer] == '[':
if plist[dpointer]:
stack.append(pointer-1)
else:
while string[pointer] != ']': pointer+=1
elif string[pointer] == '.':
sys.stdout.write(chr(plist[dpointer]))
sys.stdout.flush()
elif string[pointer] == ',':
plist[dpointer] = ord(sys.stdin.readline()[0])
sys.stdin.flush()
pointer+=1
def pi2bf(string):
out = ""
t = { 0:'>', 1:'<', 2:'+', 3:'-', 4:'.', 5:',', 6:'[', 7:']' }
k, a, b, a1, b1, r = 2, 4, 1, 12, 4, True
while r:
p, q, k = k*k, 2*k+1, k+1
a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
d = a / b
d1 = a1 / b1
while d == d1:
if len(string):
c = string[0]
string = string[1:]
else: c = ''
if len(c) == 0:
r = False
break
try: c = int(c)
except: continue
if c != d: out += t[c - (c > d)]
a, a1 = 10*(a%b), 10*(a1%b1)
d, d1 = a/b, a1/b1
return out
def bf2pi(string):
random.seed()
out = ""
t = { '>':0, '<':1, '+':2, '-':3, '.':4, ',':5, '[':6, ']':7 }
k, a, b, a1, b1, cl, r = 2, 4, 1, 12, 4, random.randint(20,30), True
while r:
p, q, k = k*k, 2*k+1, k+1
a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
d = a / b
d1 = a1 / b1
while d == d1:
if cl:
out+= str(d)
cl -= 1
else:
if len(string):
c = string[0]
string = string[1:]
else: c = ''
if len(c) == 0:
r = False
break
try: c = t[c]
except: continue
out += str(c + (c >= d))
cl = random.randint(2,7)
a, a1 = 10*(a%b), 10*(a1%b1)
d, d1 = a/b, a1/b1
return "%s.%s"%(out[0],out[1:])
if __name__ == '__main__':
if len(sys.argv) == 1:
#reading from stdin
bf(pi2bf(sys.stdin.read()))
elif sys.argv[1] == '-':
bf(pi2bf(" ".join(sys.argv[2:])))
elif sys.argv[1] == '-bf':
bf(" ".join(sys.argv[2:]))
elif sys.argv[1] == '--bf':
f = open(sys.argv[2])
bf(f.read())
elif sys.argv[1] == '--convert':
f = open(sys.argv[2])
print bf2pi(f.read())
elif sys.argv[1] == '-c':
print bf2pi(" ".join(sys.argv[2:]))
elif sys.argv[1] == '--tobf':
f = open(sys.argv[2])
print pi2bf(f.read())
elif sys.argv[1] == '-2bf':
print pi2bf(" ".join(sys.argv[2:]))
elif sys.argv[1] == '-h' or sys.argv[1] == '--help':
print """pi language commands:
* -bf: parses a bf command
* --bf: parses a bf file
* - : parses a pi number from command line
* -h --help: displays this help
* --convert: convert a bf file into pi
* -c: convert a bf command into pi
* --tobf convert a pi file into bf
* -2bf convert a pi command into bf"""
else:
f = open(sys.argv[1])
bf(pi2bf(f.read()))
