class Parser:
def __init__(self, source):
self.T = Tokenizer(source)
self.tokenList = []
self.createTokenList()
self.dispTokenList()
self.index = -1
self.history = []
def reInit(self, source):
self.T = Tokenizer(source)
self.tokenList = []
self.createTokenList()
self.dispTokenList()
self.index = -1
self.history = []
def createTokenList(self):
#print "TOKENIZER STEP"
while True:
token = self.T.getToken()
if token is not None:
token.display()
self.tokenList.append(token)
if token.type == EOF:
break
#raw_input()
def dispTokenList(self):
for token in self.tokenList:
token.display()
def lookNextToken(self):
try:
return self.tokenList[self.index + 1]
except IndexError as e:
return None
def currToken(self):
return self.tokenList[self.index]
def getNextToken(self):
self.index += 1
return self.tokenList[self.index]
def graphInit(self):
#graphics part
pygame.init()
self.white = 255, 255 , 255
self.screen = pygame.display.set_mode((WINDOWX,WINDOWY))
self.Turtle = Turtle(WINDOWX,WINDOWY)
self.Turtle.setImage(pygame.image.load("logo2.png"))
self.screen.fill(self.white)
self.Turtle.draw(self.screen)
pygame.display.flip()
pygame.display.set_icon(pygame.image.load("logo2.png"))
pygame.display.set_caption(" Turtle")
def parse(self):
self.parseSentence()
while True:
tokenAhead = self.lookNextToken()
if tokenAhead == None:
break
elif tokenAhead.type == EOF:
break
elif tokenAhead.type == KEYWORD:
self.parseSentence()
else:
break
def parseSentence(self):
#parsing
nextToken = self.lookNextToken()
if nextToken.value not in keywords:
print "Invalid input"
return
if nextToken.value in ['fd', 'bk', 'rt', 'lt']:
self.Match()
if(self.Match(NUMERIC) == -1):
return
# graphics
if nextToken.value == 'fd':
self.Turtle.mvForward(int(self.currToken().value), self.screen)
if nextToken.value == 'bk':
self.Turtle.mvBackward(int(self.currToken().value), self.screen)
if nextToken.value == 'lt':
self.Turtle.rotate(int(self.currToken().value))
if nextToken.value == 'rt':
self.Turtle.rotate(int(-1 * int(self.currToken().value)))
self.history.append((nextToken.value,self.currToken().value))
if nextToken.value in ['pu', 'pd', 'ht', 'st', 'penerase']:
self.Match()
if nextToken.value == 'pu':
self.Turtle.penUp()
if nextToken.value == 'pd':
self.Turtle.penDown()
if nextToken.value == 'st':
self.Turtle.showTurtle()
if nextToken.value == 'ht':
self.Turtle.hideTurtle()
self.history.append(nextToken.value)
if nextToken.value in ['setcolor']:
self.Match()
try:
self.Match(NUMERIC)
red = int(self.currToken().value)
self.Match(NUMERIC)
green = int(self.currToken().value)
self.Match(NUMERIC)
blue = int(self.currToken().value)
self.Turtle.setPenColor(red, green, blue)
self.history.append((nextToken.value, red, green, blue))
except ValueError as e:
print e
if nextToken.value in ['repeat']:
self.Match()
self.Match(NUMERIC)
timesToLoop = int(self.currToken().value)
self.Match('[')
savedIndex = self.index
for i in range(0, timesToLoop):
self.parse()
if i != timesToLoop -1:
self.index = savedIndex
self.Match(']')
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
self.screen.fill(self.white)
self.Turtle.draw(self.screen)
pygame.display.flip()
#raw_input()
def Match(self, expectedTokenType = None):
token = self.getNextToken()
if(expectedTokenType == None):
return
if(token.type != expectedTokenType):
print "Expected token type " + expectedTokenType + " but got " + token.type
return -1
