def Parse(self):
id = Id.Id()
statement = Statement.Statement()
index = 0
file = open("test.lua")
filetext = file.read()
text = filetext.split(
) #Uses delimiter SPACE to separate the words into a list ; Stores in list split_text
file.close()
#Begins initial checks
if (text.pop(0) != "function"):
sys.exit("function not found, program terminated.")
id.Include(text, 0)
text.pop(0)
if (text.pop(0) != '('):
sys.exit("Left paran not found, program terminated.")
if (text.pop(0) != ')'):
sys.exit("Right paran not found, program terminated.")
#Ends initial checks
while text[index] != "end":
index = statement.determineStatement(text, index)
return
def parse(self):
# Use one-token lookahead to determine whether it's <int>, <id>, or (<exp>)
tokNo = t.tokenizer.get_token()
if tokNo == t.Tokens.NUMBER.value:
self.__int = Int.Int()
self.__int.parse()
self.__alternative = 1
elif tokNo == t.Tokens.IDENTIFIER.value:
self.__id = Id.Id()
self.__id.parse()
self.__alternative = 2
elif tokNo == t.Tokens.OPEN_PAREN.value:
t.tokenizer.skip_token() # Consume open paren
self.__exp = Exp.Exp()
self.__exp.parse()
self.__alternative = 3
tokNo = t.tokenizer.get_token()
t.tokenizer.skip_token() # Consume closed parent
if tokNo != t.Tokens.CLOSED_PAREN.value:
print("If: Expected token {}, got token {}".format(
t.Tokens.CLOSED_PAREN.value, tokNo))
return -1
# print("Loop: Consumed `)` token.")
else:
print("Op: Invalid Next Token {}!".format(tokNo))
exit(-1)
return -1
# Successful error code
return 0
def parse(self):
# Id
self.__id = Id.Id()
self.__id.parse()
# `=` token
tokNo = t.tokenizer.get_token()
t.tokenizer.skip_token()
if tokNo != t.Tokens.EQUALS.value:
print("Assign: Expected token {}, got token {}".format(
t.Tokens.EQUALS.value, tokNo))
return -1
# print("Assign: Consumed `=` token.")
# Exp
self.__exp = Exp.Exp()
self.__exp.parse()
# `;` token
tokNo = t.tokenizer.get_token()
t.tokenizer.skip_token()
if tokNo != t.Tokens.SEMICOLON.value:
print("Assign: Expected token {}, got token {}".format(
t.Tokens.SEMICOLON.value, tokNo))
return -1
# print("Assign: Consumed `;` token.")
# Successful error code
return 0
def determine(self,text,index):
mem = Memory.Memory()
id = Id.Id()
operators=ArithmeticOp.ArithmeticOp()
#Determine arithmetic operation
if("AssignmentStatement.py" in inspect.stack()[1][1]):
if (operators.Contains(text,index)):
result = operators.Operate(text,index)
mem.Store(result)
return index
else:
if(operators.Contains(text,index)):
result = operators.Operate(text,index)
return result
#Determine id
if (id.Include(text,index)):
return mem.mem
#Determine literal integer
if (isinstance(int(text[index]),int)): #Determines if value stored at text[index] is an integer. If not, the
if("AssignmentStatement.py" in inspect.stack()[1][1]): #Prevents storing memory for anything but assignment
mem.Store(text[index])
elif(inspect.stack()[1][3]=='sPrint'): #This determines if the sPrint method is calling ArithmeticExpression.determine
return int(text[index]) #If it is, it returns what is stored in the memory so it can be printed.
elif("ArithmeticExpression.py" in inspect.stack()[1][1]):
return int(text[index])
index+=1
return(index)
def parse(self):
self.id = Id.Id(self.t)
self.id.parse()
# If the peek token is a comma, then this is a list of identifiers
x = int(self.t.peek())
if x == 13:
self.t.getToken()
self.case = 1
self.iList = IdList(self.t)
self.iList.parse()
def parse(self):
# Id
self.__id = Id.Id()
self.__id.parse()
# If next is a comma, we are in second comma
# `,` token
tokNo = t.tokenizer.get_token()
if tokNo == t.Tokens.COMMA.value:
t.tokenizer.skip_token()
# print("IdList: Consumed `,` token.")
self.__id_list = IdList()
self.__id_list.parse()
# Successful error code
return 0
def parse(self):
# Parse based on one token look ahead
x = int(self.t.peek())
if x == 31:
self.i = Int.Int(self.t)
self.i.parse()
elif x == 32:
self.case = 1
self.idName = self.t.getValue()
self.id = Id.Id(self.t)
self.id.parse()
elif x == 20:
self.case = 2
self.t.getToken()
self.e = Exp.Exp(self.t)
x = int(self.t.getToken())
if x != 21:
print "Expected end parenthesis."
exit()
else:
print "Invalid op."
exit()
def determineStatement(self,text,index):
if_state = IfStatement.IfStatement()
id = Id.Id()
print_statement = PrintStatement.PrintStatement()
#Determines if statement
#if (text[index]=='if'):
#index = if_state.determine(text,index):
#Determines assignment statement
if(id.Include(text,index)):
index+=1 #Allows the determine statement to determine if there is a '=' present
assign = AssignmentStatement.AssignmentStatement()
index = assign.determine(text,index)
return index
#Determines while statement
#Determines print statement
if (text[index] == "print"):
index+=1
if text[index]== "(":
index+=1
index = print_statement.sPrint(text,index)
return index
else:
sys.exit("Left paran not found.")
def __init__(self, t):
self.e = Exp.Exp(t)
self.id = Id.Id(t)
self.t = t
def getId(self):
s = self.lex.getToken()
if s == "" or len(s) > 1:
raise ParserException("id expected, received " + s)
return Id(s)
