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typeSystem.py~
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typeSystem.py~
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Recursive LTROLL type checker
# God have mercy of our souls
# by: André Driemeyer andredriem@gmail.com
from tokenTree import TokenTree
import copy
class TypeSystem:
bools = ('true','false')
nat_to_nat_op = ('+','-')
nat_to_bool_op = ('<','>','<=','>=')
nat_or_bool_to_bool_op = ('=','=/=')
bool_to_bool_op = ('or','and')
def __init__(self, tree, variables = {}):
self.variables = variables
self.tree = tree
pass
def getTree(self):
return self.tree
def checkType(self):
rule = self.__detectTypeRule__()
#print '------------------------'
#print rule
#print self.variables
#print self.tree
if rule == 't-int':
return self.__tint__()
elif rule == 't-bool':
return self.__tbool__()
elif rule == 't-skip':
return self.__tskip__()
elif rule == 't-label1':
return self.__tlabel1__()
elif rule == 't-label2':
return self.__tlabel2__()
elif rule == 't-in':
return self.__tin__()
elif rule == 't-fn':
return self.__tfn__()
elif rule == 't-assing':
return self.__tassing__()
elif rule == 't-derref':
return self.__tderref__()
elif rule == 't-pontoevirgula':
return self.__tpontoevirgula__()
elif rule == 't-doispontos':
return self.__tdoispontos__()
elif rule == 't-genbool':
return self.__tgenbool__()
elif rule == 't-natbool':
return self.__tnatbool__()
elif rule == 't-natnat':
return self.__tnatnat__()
elif rule == 't-for':
return self.__tfor__()
elif rule == 't-if':
return self.__tif__()
elif rule == 't-boolbool':
return self.__tboolbool__()
elif rule == 't-notnot':
return self.__tnotnot__()
def __detectTypeRule__(self):
if type(self.tree) == type('string') and self.tree.isdigit() == True:
return 't-int'
elif type(self.tree) == type('string') and self.tree in self.bools:
return 't-bool'
elif type(self.tree) == type('string') and self.tree == 'skip':
return 't-skip'
elif type(self.tree) == type('string') and self.tree in self.variables:
return 't-label1'
elif type(self.tree) == type('string') and self.tree not in self.variables:
return 't-label2'
elif self.tree[0] == 'fn':
return 't-fn'
elif self.tree[1] == 'in':
return 't-in'
elif self.tree[1] == ':=':
return 't-assing'
elif self.tree[0] == '!':
return 't-derref'
elif self.tree[0] == 'notnot':
return 't-notnot'
elif self.tree[1] == ';':
return 't-pontoevirgula'
elif self.tree[1] == ':':
return 't-doispontos'
elif self.tree[1] in self.nat_or_bool_to_bool_op:
return 't-genbool'
elif self.tree[1] in self.bool_to_bool_op:
return 't-boolbool'
elif self.tree[1] in self.nat_to_bool_op:
return 't-natbool'
elif self.tree[1] in self.nat_to_nat_op:
return 't-natnat'
elif self.tree[0] == 'for':
return 't-for'
elif self.tree[0] == 'for':
return 't-for'
elif self.tree[0] == 'if':
return 't-if'
def __tint__(self):
return ['nat']
def __tbool__(self):
return ['bool']
def __tskip__(self):
return ['unit']
def __tlabel1__(self):
return self.variables[self.tree]
def __tlabel2__(self):
return ['unit']
def __tfn__(self):
type_variable = self.tree[3]
new_variables = copy.deepcopy(self.variables)
new_variables[self.tree[1]] = type_variable
print '\n\n'
print new_variables
type_expression = TypeSystem(self.tree[5],new_variables).checkType()
return [type_variable,'-->',type_expression]
def __tin__(self):
type_function = TypeSystem(self.tree[0],self.variables).checkType()
type_variable = TypeSystem(self.tree[2],self.variables).checkType()
print '------------'
print type_function
print type_variable
if type_function[0] == type_variable:
return type_function[2]
else:
raise TypeError("Funcao esta recebendo argumento do "
"tipo: " + str(type_variable) + " enquanto"
" deveria estar recebendo do tipo: " +
str(type_function[0]))
def __tassing__(self):
if self.tree[2] in self.variables:
label_type = self.variables[self.tree[2]]
else:
raise TypeError("label '%s' nao declarada"%(self.tree[2]))
value_type = TypeSystem(self.tree[0],self.variables).checkType()
if label_type == ['unit']:
self.variables[self.tree[2]] = ['ref',value_type]
elif label_type[1] != value_type:
raise TypeError("label ja usada antes para outro tipo")
return ['unit']
def __tderref__(self):
if self.tree[1] not in self.variables:
print self.variables
raise TypeError("label nao foi acossiada a nenhuma variavel anteriormente")
else:
return self.variables[self.tree[1]][1]
def __tpontoevirgula__(self):
typeSystemFirst = TypeSystem(self.tree[2],copy.deepcopy(self.variables))
typeSystemFirst.checkType()
self.variables = typeSystemFirst.variables
return TypeSystem(self.tree[0],self.variables).checkType()
def __tdoispontos__(self):
typeSystemFirst = TypeSystem(self.tree[0],copy.deepcopy(self.variables))
typeSystemFirst.checkType()
self.variables = typeSystemFirst.variables
return TypeSystem(self.tree[2],self.variables).checkType()
##Generalizacao das regras das funcoes == e =/=
def __tgenbool__(self):
temp = TypeSystem(self.tree[0],self.variables)
type_first = temp.checkType()
type_second = TypeSystem(self.tree[2],temp.variables).checkType()
if type_first == type_second:
return ['bool']
else:
raise TypeError("Tentando comparar 2 tipos diferentes")
##Generalizacao das regras das funcoes > < >= <=
def __tnatbool__(self):
temp = TypeSystem(self.tree[0],self.variables)
type_first = temp.checkType()
type_second = TypeSystem(self.tree[2],temp.variables).checkType()
if type_first == ['nat'] and type_second == ['nat']:
return ['bool']
else:
raise TypeError("Operacao so aceita naturais")
#Generalizacao das regras das funcoes + -
def __tnatnat__(self):
temp = TypeSystem(self.tree[0],self.variables)
type_first = temp.checkType()
type_second = TypeSystem(self.tree[2],temp.variables).checkType()
if type_first == ['nat'] and type_second == ['nat']:
return ['nat']
else:
raise TypeError("Operacao so aceita naturais")
def __tfor__(self):
temp = TypeSystem(self.tree[1],self.variables)
type_first = temp.checkType()
temp2 = TypeSystem(self.tree[3],temp.variables)
type_second = temp2.checkType()
type_third = TypeSystem(self.tree[5],temp2.variables).checkType()
if type_first == ['nat'] and type_second == ['nat']:
return type_third
else:
raise TypeError("Comparacao do for deve ser feita com naturais")
def __tif__(self):
temp = TypeSystem(self.tree[1],self.variables)
type_first = temp.checkType()
temp2 = TypeSystem(self.tree[3],temp.variables)
type_second = temp2.checkType()
type_third = TypeSystem(self.tree[5],temp2.variables).checkType()
if type_first == ['bool'] and type_second == type_third:
return type_third
else:
raise TypeError("Comparacao do for deve ser feita com naturais")
def __tboolbool__(self):
temp = TypeSystem(self.tree[0],self.variables)
type_first = temp.checkType()
type_second = TypeSystem(self.tree[2],temp.variables).checkType()
#print type_first
#print type_second
if type_first == ['bool'] and type_second == ['bool']:
return ['bool']
else:
raise TypeError("Operacao so aceita booleanos")
def __tnotnot__(self):
type_first = TypeSystem(self.tree[1],self.variables).checkType()
if type_first == ['bool']:
return ['bool']
else:
raise TypeError("Operacao notnot so aceita booleanos")
if __name__ == '__main__':
dic = {}
#dic['pizza'] = ['ref',['nat']]
tree = TokenTree('for $ $ 4 := pizza : 3 until $ $ 9 := pizza : 6 do ! pizza').tree
print 'tree: ' + str(tree)
test = TypeSystem(tree,dic)
print test.checkType()
print test.variables