def parseFactor():
current = Parser.tokens.actual
# print(current.value)
if current.type == "PLUS":
Parser.tokens.selectNext()
factor = Parser.parseFactor()
node = n.UnOp("PLUS", [factor])
elif current.type == "MINUS":
Parser.tokens.selectNext()
factor = Parser.parseFactor()
node = n.UnOp("MINUS", [factor])
elif current.type == "INT":
node = n.IntVal(current.value)
Parser.tokens.selectNext()
elif current.type == "BOOL":
if current.value == "true":
node = n.BoolVal(True)
else:
node = n.BoolVal(False)
Parser.tokens.selectNext()
elif current.type == "STRING":
node = n.StringVal(current.value)
Parser.tokens.selectNext()
elif current.type == "OPEN":
Parser.tokens.selectNext()
node = Parser.parseRelExpression()
current = Parser.tokens.actual
if current.type != "CLOSE":
raise Exception("Nao fechou parenteses")
Parser.tokens.selectNext()
elif current.type == "VARIABLE":
Parser.tokens.selectNext()
node = n.Identifier(current.value)
elif current.type == "NOT":
Parser.tokens.selectNext()
factor = Parser.parseFactor()
node = n.UnOp("NOT", [factor])
else:
raise Exception("Queria FACTOR, recebeu {}".format(current.type))
return node
def fator():
new_token = Parser.tokens.actual
# check if token is unary operator
if (new_token.type == 'PLUS' or new_token.type == 'MINUS'
or new_token.type == 'NOT'):
if (new_token.type == 'PLUS'):
Parser.tokens.selectNext()
return nd.UnOp('+', [Parser.fator()])
elif (new_token.type == 'MINUS'):
Parser.tokens.selectNext()
return nd.UnOp('-', [Parser.fator()])
elif (new_token.type == 'NOT'):
Parser.tokens.selectNext()
return nd.UnOp('~', [Parser.fator()])
else:
raise TypeError("Invalid Token Error: ", new_token.type)
# check if token is a number
elif new_token.type == 'INT':
left = nd.IntVal(new_token.value, [])
Parser.tokens.selectNext()
return left
# check if token is a boolean
elif new_token.type in ['TRUE', 'FALSE']:
left = nd.BoolVal(new_token.type, [])
Parser.tokens.selectNext()
return left
# check if token is a variable
elif new_token.type == 'identifier':
left = new_token.value
Parser.tokens.selectNext()
if (Parser.tokens.actual.type == '('):
Parser.tokens.selectNext()
right = []
while (Parser.tokens.actual.type != ')'):
right.append(Parser.relExpression())
if (Parser.tokens.actual.type == ','):
Parser.tokens.selectNext()
Parser.tokens.selectNext()
return nd.FuncCall(left, right)
else:
return nd.Identifier(left, [])
elif new_token.type == 'INPUT':
left = nd.Input('input', [])
Parser.tokens.selectNext()
return left
# check if token is parentesis
elif new_token.type == '(':
Parser.tokens.selectNext()
left = Parser.relExpression()
new_token = Parser.tokens.actual
if new_token.type == ')':
Parser.tokens.selectNext()
return left
else:
raise TypeError(
"Invalid Token Error - Expecting Parentesis ')' ")
else:
raise SyntaxError(
"Invalid Token - Sentence should start with number, parentesis or operator (+,-): ",
new_token.type)
