If you thought the programs for recipe 578366 were too difficult to understand, you have just found an upgrade to the COW language: mnemonics humans can understand. This recipe makes a slight alteration to the interpreter so as to take the decoded instructions instead of the COW (moo) instructions.
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'MoO', 'MOO', 'OOO', 'MMM', 'OOM', 'oom']
HLP = dict((s, i) for i, s in enumerate(INS))
import sys
import msvcrt
################################################################################
class COD:
def __init__(self, code):
for ins in code:
assert 0 <= ins < len(INS)
self.cod = code
self.pos = 0
def get(self):
return self.cod[self.pos]
def inc(self):
self.pos += 1
if self.pos == len(self.cod):
raise SystemExit
def dec(self):
self.pos -= 1
assert self.pos >= 0
################################################################################
class MEM:
def __init__(self):
self.mem = {}
self.pos = 0
def get(self):
if self.pos in self.mem:
return self.mem[self.pos]
return 0
def set(self, value):
if value:
self.mem[self.pos] = value
elif self.pos in self.mem:
del self.mem[self.pos]
def inc(self):
self.pos += 1
def dec (self):
self.pos -= 1
################################################################################
def parse(string):
index = 0
code = []
ins = string[index:index+3]
while len(ins) == 3:
if ins in INS:
code.append(INS.index(ins))
index += 3
else:
index += 1
ins = string[index:index+3]
return tuple(code)
DECODE = ['END', 'P--', 'P++', 'EXE', 'I/O', 'M--',
'M++', 'LOP', 'M=0', 'REG', 'OUT', 'INP']
def decode(code):
for ins in code:
print INS[ins] + '\t' + DECODE[ins]
print
def engine(code):
global REG
REG = None
mem = MEM()
cod = COD(code)
ins = cod.get()
while True:
ins = run(mem, cod, ins)
def run(mem, cod, ins):
global REG
# INS - 0 - moo
if ins == 0:
cod.dec()
cod.dec()
# INIT
level = 1
temp = cod.get()
if temp == HLP['moo']:
level += 1
elif temp == HLP['MOO']:
level -= 1
while level:
# LOOP
cod.dec()
temp = cod.get()
if temp == HLP['moo']:
level += 1
elif temp == HLP['MOO']:
level -= 1
return HLP['MOO']
# INS - 1 - mOo
elif ins == 1:
mem.dec()
cod.inc()
return cod.get()
# INS - 2 - moO
elif ins == 2:
mem.inc()
cod.inc()
return cod.get()
# INS - 3 - mOO
elif ins == 3:
temp = mem.get()
assert temp != 3
if 0 <= temp < len(INS):
return run(mem, cod, temp)
else:
raise SystemExit
# INS - 4 - Moo
elif ins == 4:
temp = mem.get()
if temp:
sys.stdout.write(chr(temp & 0x7F))
else:
char = get_char()
mem.set(ord(char) & 0x7F)
cod.inc()
return cod.get()
# INS - 5 - MOo
elif ins == 5:
mem.set(mem.get() - 1)
cod.inc()
return cod.get()
# INS - 6 - MoO
elif ins == 6:
mem.set(mem.get() + 1)
cod.inc()
return cod.get()
# INS - 7 - MOO
elif ins == 7:
temp = mem.get()
if temp:
cod.inc()
return cod.get()
else:
cod.inc()
cod.inc()
# INIT
level = 1
temp = cod.get()
if temp == HLP['moo']:
level -= 1
elif temp == HLP['MOO']:
level += 1
while level:
# LOOP
cod.inc()
temp = cod.get()
if temp == HLP['moo']:
level -= 1
elif temp == HLP['MOO']:
level += 1
cod.inc()
return cod.get()
# INS - 8 - OOO
elif ins == 8:
mem.set(0)
cod.inc()
return cod.get()
# INS - 9 - MMM
elif ins == 9:
if REG is None:
REG = mem.get()
else:
mem.set(REG)
REG = None
cod.inc()
return cod.get()
# INS - 10 - OOM
elif ins == 10:
sys.stdout.write(str(mem.get()) + '\n')
cod.inc()
return cod.get()
# INS - 11 - oom
elif ins == 11:
mem.set(get_int())
cod.inc()
return cod.get()
# ERROR
else:
raise Exception
def get_char():
while msvcrt.kbhit():
msvcrt.getch()
func = False
char = msvcrt.getch()
if char in ('\x00', '\xE0'):
func = True
while func:
msvcrt.getch()
func = False
char = msvcrt.getch()
if char in ('\x00', '\xE0'):
func = True
return char.replace('\r', '\n')
def get_int():
while msvcrt.kbhit():
msvcrt.getch()
buff = ''
char = msvcrt.getch()
while char != '\r' or not buff:
if '0' <= char <= '9':
sys.stdout.write(char)
buff += char
char = msvcrt.getch()
sys.stdout.write('\n')
return int(buff)
################################################################################
def main():
path = raw_input('Run File: ') + '.cow'
code = parse(file(path).read())
decode(code)
engine(code)
################################################################################
if __name__ == '__main__':
INS, DECODE = DECODE, INS
try:
main()
except SystemExit:
raw_input()
except:
import traceback
raw_input(traceback.format_exc())
|
The following version of the interpreter also has some minimal debugging facilities built into it.
INS = ['moo', 'mOo', 'moO', 'mOO', 'Moo', 'MOo',
'MoO', 'MOO', 'OOO', 'MMM', 'OOM', 'oom',
'DBG']
HLP = dict((s, i) for i, s in enumerate(INS))
import sys
import msvcrt
################################################################################
class COD:
def __init__(self, code):
for ins in code:
assert 0 <= ins < len(INS)
self.cod = code
self.pos = 0
def get(self):
return self.cod[self.pos]
def inc(self):
self.pos += 1
if self.pos == len(self.cod):
raise SystemExit
def dec(self):
self.pos -= 1
assert self.pos >= 0
################################################################################
class MEM:
def __init__(self):
self.mem = {}
self.pos = 0
def get(self):
if self.pos in self.mem:
return self.mem[self.pos]
return 0
def set(self, value):
if value:
self.mem[self.pos] = value
elif self.pos in self.mem:
del self.mem[self.pos]
def inc(self):
self.pos += 1
def dec (self):
self.pos -= 1
################################################################################
def parse(string):
index = 0
code = []
ins = string[index:index+3]
while len(ins) == 3:
if ins in INS:
code.append(INS.index(ins))
index += 3
else:
index += 1
ins = string[index:index+3]
return tuple(code)
DECODE = ['END', 'P--', 'P++', 'EXE', 'I/O', 'M--',
'M++', 'LOP', 'M=0', 'REG', 'OUT', 'INP',
'DBG']
def decode(code):
for ins in code:
print INS[ins] + '\t' + DECODE[ins]
print
def engine(code):
global REG
REG = None
mem = MEM()
cod = COD(code)
ins = cod.get()
while True:
ins = run(mem, cod, ins)
def run(mem, cod, ins):
global REG
# INS - 0 - moo
if ins == 0:
cod.dec()
cod.dec()
# INIT
level = 1
temp = cod.get()
if temp == HLP['moo']:
level += 1
elif temp == HLP['MOO']:
level -= 1
while level:
# LOOP
cod.dec()
temp = cod.get()
if temp == HLP['moo']:
level += 1
elif temp == HLP['MOO']:
level -= 1
return HLP['MOO']
# INS - 1 - mOo
elif ins == 1:
mem.dec()
cod.inc()
return cod.get()
# INS - 2 - moO
elif ins == 2:
mem.inc()
cod.inc()
return cod.get()
# INS - 3 - mOO
elif ins == 3:
temp = mem.get()
assert temp != 3
if 0 <= temp < len(INS):
return run(mem, cod, temp)
else:
raise SystemExit
# INS - 4 - Moo
elif ins == 4:
temp = mem.get()
if temp:
sys.stdout.write(chr(temp & 0x7F))
else:
char = get_char()
mem.set(ord(char) & 0x7F)
cod.inc()
return cod.get()
# INS - 5 - MOo
elif ins == 5:
mem.set(mem.get() - 1)
cod.inc()
return cod.get()
# INS - 6 - MoO
elif ins == 6:
mem.set(mem.get() + 1)
cod.inc()
return cod.get()
# INS - 7 - MOO
elif ins == 7:
temp = mem.get()
if temp:
cod.inc()
return cod.get()
else:
cod.inc()
cod.inc()
# INIT
level = 1
temp = cod.get()
if temp == HLP['moo']:
level -= 1
elif temp == HLP['MOO']:
level += 1
while level:
# LOOP
cod.inc()
temp = cod.get()
if temp == HLP['moo']:
level -= 1
elif temp == HLP['MOO']:
level += 1
cod.inc()
return cod.get()
# INS - 8 - OOO
elif ins == 8:
mem.set(0)
cod.inc()
return cod.get()
# INS - 9 - MMM
elif ins == 9:
if REG is None:
REG = mem.get()
else:
mem.set(REG)
REG = None
cod.inc()
return cod.get()
# INS - 10 - OOM
elif ins == 10:
sys.stdout.write(str(mem.get()) + '\n')
cod.inc()
return cod.get()
# INS - 11 - oom
elif ins == 11:
mem.set(get_int())
cod.inc()
return cod.get()
# INS - 12 - DBG
elif ins == 12:
debug(mem)
cod.inc()
return cod.get()
# ERROR
else:
raise Exception
def get_char():
while msvcrt.kbhit():
msvcrt.getch()
func = False
char = msvcrt.getch()
if char in ('\x00', '\xE0'):
func = True
while func:
msvcrt.getch()
func = False
char = msvcrt.getch()
if char in ('\x00', '\xE0'):
func = True
return char.replace('\r', '\n')
def get_int():
while msvcrt.kbhit():
msvcrt.getch()
buff = ''
char = msvcrt.getch()
while char != '\r' or not buff:
if '0' <= char <= '9':
sys.stdout.write(char)
buff += char
char = msvcrt.getch()
sys.stdout.write('\n')
return int(buff)
def debug(mem):
cache = 'DEBUG\n=====\n[POS] = %s\n' % mem.pos
for index in range(min(mem.mem), max(mem.mem) + 1):
cache += '[%03i] = %i\n' % (index, mem.mem.get(index, 0))
sys.stdout.write(cache + '=====\n')
################################################################################
def main():
path = raw_input('Run File: ') + '.cow'
code = parse(file(path).read())
decode(code)
engine(code)
################################################################################
if __name__ == '__main__':
INS, DECODE = DECODE, INS
try:
main()
except SystemExit:
raw_input()
except:
import traceback
raw_input(traceback.format_exc())
Of course, you will want some programs that your new easy cow can run for you.
Adder
INP
P++
INP
LOP
M--
P--
M++
P++
END
P--
OUT
Conditional Test
M++M++ a = 2
REGP++REG b = a
P++M=0
M++M++M++ c = 3
LOP
M--P-- c = 0
M--P++ b -= c
END
P--LOP if b: # if a != 3:
P--OUT print a
P--M--OUTP++ print -1
P++M=0
LOPEND else:
[[ ERROR - ELSE cannot be executed ]]
P--OUT print a
P--M--M--OUTP++ print -2
P++M=0LOP
ENDENDP-- end_if
OUT print a
P--M=0M--M--M--OUT print -3
Hello, World!
# This is the string.
H = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
e = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
l = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
l = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
o = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
, = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
= M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
W = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
o = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
r = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
l = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
d = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++P++
! = M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++M++
# Rewind the pointer.
P--P--P--P--P--P--P--P--P--P--P--P--
# Print the string.
LOP
I/O
P++
END
Multiplier
INP a = get_num()
P++
INP b = get_num()
P--
LOP while a:
M-- a -= 1
P++
REG temp = b
LOP while b: #
M-- b -= 1 #
P++ #
M++ c += 1 #
P-- #
END # c += b
REG b = temp
P--
END
P++
P++
OUT print c
Tags: interpreter
