gistfile1.sc

# Translation note:
# init() will not be needed. Our input is already ready to be read. (Alliteration :D)

# Translated from http://compilers.iecc.com/crenshaw/tutor1.txt

TAB = "\t"

class scanner:
	def __init__(self):
		self.input = list(raw_input())
		self.look = 0

	def step(self):
		'''Move look forward'''
		self.look += 1

	def nextchar(self):
		'''Returns the next char to be read, but
		does not progress look
		'''
		return self.input[self.look + 1]

	def char(self):
		'''Current char'''
		return self.input[self.look]

scan = scanner()

def error(s):
	print
	print "Error: %s" % s

def abort(s):
	error(s)
	exit()

def expected(s):
	abort("Expected %s" % s)

def match(x):
	if scan.char() == x:
		scan.step()
	else:
		expected(x)

def getname():
	if not scan.char().isalpha():
		expected('Name')

	ret = scan.char().upper()
	scan.step()
	return ret

def getnum():
	if not scan.char().isdigit():
		expected('Integer')
	
	ret = scan.char()
	scan.step()
	return ret

def emit(s, ln=False):
	print TAB, s
	if ln:
		print

def term():
	emit("MOVE #" + getnum() + ",D0", True)

def expression():
	term()
	emit("MOVE D0, D1", True)
	if scan.char() == "+":
		add()
	elif scan.char() == "-":
		subtract()
	else:
		expected("Addop")

def add():
	match("+")
	term()
	emit("ADD D1,D0", True)

def subtract():
	match("-")
	term()
	emit("SUB D1,D0", True)
	emit("NEG D0", True)

if __name__ == "__main__":
	expression()