class jZeroLexer:
	"""
	@Author: Adam Miller
	@Course: CS430 - Language Translators
	@Professor: Dr. Burris
	"""
	
	#grammar defined letter 
	letter = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
	
	#grammar defined digit
	digit = '0123456789'
	
	#grammar defined ops
	ops = '*/=<>,;+-(){}!'
	
	#symbolic white space
	wSpace = '  \n \t'

	#table to drive the lexical analyzer PDA
	lexTable = [
			[5 ,  3,  2,  7, 11, 14,  0, 17, 20, 21, 22, 23, 24, 25, 26, 27, 28],
			[1 ,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1],
			[2 ,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2],
			[4 ,  3,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4],
			[4 ,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4],
			[5 ,  5,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6],
			[6 ,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  6],
			[10, 10,  8, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10],
			[8 ,  8,  9,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8],
			[8 ,  8,  8,  0,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8],
			[10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10],
			[12, 12, 12, 12, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12],
			[12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12],
			[13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13],
			[15, 15, 15, 15, 16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15],
			[15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15],
			[16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16],
			[18, 18, 18, 18, 19, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18],
			[18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18],
			[19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19],
			[20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20],
			[21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21],
			[22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22],
			[23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23],
			[24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24],
			[25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25],
			[26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26],
			[27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27],
			[ 1,  1,  1,  1, 29,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1],
			[29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29],
			]
	
	#lexTable column index relations
	lexRelations= {"letter":0,"digit":1,"*":2,"/":3,"=":4,"<":5,"wSpace":6,">":7,
		",":8,";":9,"+":10,"-":11,"(":12,")":13,"{":14,"}":15,"!":16}
		
	lexFinalStates = [1,2,4,6,10,12,13,15,16,18,19,20,21,22,23,24,25,26,27,29]
		
	def __init__(self, fileName):
		"""open a file and initialize the lexical analyzer"""
		self.f = open(fileName, 'r')
		self.charBuffer = []
		self.lexState = 0
		
	def scan(self):
		"""read in line by line and then one character at a time"""
		for line in self.f.readlines():
			for c in line:
				
				#let table drive state transitions
				if self.lexState not in self.lexFinalStates:
					self.lexState = self.lexTable[self.lexState][self.lex(c)]
				
				#add current character to the buffer
				if c not in self.wSpace:
					self.charBuffer.append(c)
				
				# 1 is the error state
				if self.lexState == 1:
					print "Error"
					self.lexState = 0
					self.charBuffer = []		
				#check to see if current state is a final state		
				elif self.lexState in self.lexFinalStates:
					print ''.join(self.charBuffer)
					self.lexState = 0
					self.charBuffer = []
				
				#print self.lexState #for debugging
								
					
		"""print final character buffer because the loop will end
		execution and not let the last success state be checked"""
		print ''.join(self.charBuffer)
				
	def lex(self, c):
		"""return the correct relational index to the type of c"""
		if c in self.letter:
			return self.lexRelations["letter"]
		elif c in self.digit:
			return self.lexRelations["digit"]
		elif c in self.wSpace:
			return self.lexRelations["wSpace"]
		elif c in self.ops:
			return self.lexRelations[c]
		else:
			return 0
		
		
fn = raw_input("Please enter file name: ")
lexer = jZeroLexer(fn)
lexer.scan()