def loop(p):
p += 1
endPosition = None
condition = []
while listaDeTokens[p][0] != 'do':
condition.append(listaDeTokens[p][0])
p += 1
conditionValue = calc(condition)
p += 1
i = p
while conditionValue == "True":
while listaDeTokens[i][0] != 'end':
i = check(i) + 1
conditionValue = calc(condition)
endPosition = i
i = p
# caso o while inicie com condição falsa
if endPosition == None:
pilha_bloco = Stack()
while listaDeTokens[p][0] != 'end' or not pilha_bloco.isEmpty():
if listaDeTokens[p][0] == 'if' or listaDeTokens[p][
0] == "to" or listaDeTokens[p][0] == "while":
pilha_bloco.push(listaDeTokens[p][0])
elif listaDeTokens[p][0] == 'end' or listaDeTokens[p][0] == "fi":
pilha_bloco.pop()
p += 1
endPosition = p
return endPosition
def infixToPostfix(tokenList):
prec = {}
prec["*"] = 3
prec["/"] = 3
prec["+"] = 2
prec["-"] = 2
prec["("] = 1
prec[">"] = 0
prec["<"] = 0
prec["="] = 0
prec[">="] = 0
prec["<="] = 0
opStack = Stack()
postfixList = []
for token in tokenList:
if token.isnumeric() or token not in [
'+', '-', '*', '/', '(', ')', '>', '<', '=', '<=', '>='
]:
if not token.isnumeric():
token = tabela_sintatica.tabela[token]['value']
if not token.isnumeric():
print("erro! variável sem valor atribuído." + token)
exit()
postfixList.append(token)
elif token == '(':
opStack.push(token)
elif token == ')':
topToken = opStack.pop()
while topToken != '(':
postfixList.append(topToken)
topToken = opStack.pop()
else:
while (not opStack.isEmpty()) and \
(prec[opStack.peek()] >= prec[token]):
postfixList.append(opStack.pop())
opStack.push(token)
while not opStack.isEmpty():
postfixList.append(opStack.pop())
return postfixList
def condicional(p):
p += 1
condition = []
while listaDeTokens[p][0] != 'then':
condition.append(listaDeTokens[p][0])
p += 1
conditionValue = calc(condition)
pilha_bloco = Stack()
if conditionValue == "False":
while (listaDeTokens[p][0] != 'else'
and listaDeTokens[p][0] != 'fi') or not pilha_bloco.isEmpty():
if listaDeTokens[p][0] == 'if' or listaDeTokens[p][
0] == "to" or listaDeTokens[p][0] == "while":
pilha_bloco.push(listaDeTokens[p][0])
elif listaDeTokens[p][0] == 'end' or listaDeTokens[p][0] == "fi":
pilha_bloco.pop()
p += 1
if listaDeTokens[p][0] == 'fi':
return p
p += 1
while listaDeTokens[p][0] != 'else' and listaDeTokens[p][0] != 'fi':
p = check(p) + 1
if listaDeTokens[p][0] != "fi":
pilha_bloco = Stack()
pilha_bloco.push("if")
while not pilha_bloco.isEmpty():
if listaDeTokens[p][0] == 'if' or listaDeTokens[p][
0] == "to" or listaDeTokens[p][0] == "while":
pilha_bloco.push(listaDeTokens[p][0])
elif listaDeTokens[p][0] == 'end' or listaDeTokens[p][0] == "fi":
pilha_bloco.pop()
p += 1
p = p - 1
return p