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Sistemas P, computación con membranas.
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#!/usr/bin/env python | |
# -*- coding: utf-8 -*- | |
# Author: Overxfl0w13 # | |
# P Systems # | |
# PI = (O,mu,w1,...,wm,(R1,p1),...,(Rm,pm),i0) # | |
# O -> Alfabeto de objetos (catalizadores, de entrada y de salida) | |
# mu -> estructura de membranas en forma parentizada (estructura de árbol) | |
# w1,...,wm -> Cadenas representación de multiconjuntos asociadas a cada membrana | |
# (R1,p1)...,(Rm,pm) -> Reglas de evolución y relaciones de prioridad | |
# En las reglas de evolución, se eliminarán las relaciones de prioridad por simplicidad y no se permiten reglas cooperativas, | |
# con más de un elemento en la parte derecha de la regla # | |
# i0 -> Membrana de salida. | |
from random import randint | |
def p_system(PI): | |
O,mu,w,R,i0,winf = PI[0],PI[1],PI[2],PI[3],PI[4],[] | |
while True: | |
rules = [] | |
for x in xrange(len(w)): # Indice Region # | |
for y in xrange(len(w[x])): # Indice objeto # | |
for rule in R[x]: | |
if w[x][y] in rule[0]: | |
rules.append((x,(" ".join(w[x]).replace(w[x][y]," ".join(rule[1])).split(" ")))) | |
if len(rules)==0: break | |
randomRule = randint(0,len(rules)-1) | |
regla = rules[randomRule] | |
region_afectada = regla[0] | |
elim_region = False | |
w[region_afectada] = regla[1] | |
for s in xrange(len(w[region_afectada])): | |
if w[region_afectada][s]=="delta": elim_region=True | |
if "in" in w[region_afectada][s] and w[region_afectada][-1]==region_afectada+1: | |
w[region_afectada+1].insert(0,w[region_afectada][s][0]) | |
w[region_afectada][s] = "" | |
if "here" in w[region_afectada][s]: w[region_afectada][s] = w[region_afectada][s][0] | |
if "out" in w[region_afectada][s]: | |
if region_afectada==0: winf.insert(0,w[region_afectada][s][0]) | |
else: | |
w[region_afectada-1].insert(0,w[region_afectada][s][0]) | |
w[region_afectada][s] = "" | |
for p in xrange(len(w)): | |
try: | |
while '' in w[p]: w[p].remove('') | |
except ValueError as ve: continue | |
if elim_region==True: | |
for sim in w[region_afectada]: | |
if sim!="delta": w[region_afectada-1].insert(0,sim) | |
del w[region_afectada] | |
del R[region_afectada] | |
elim_region = False | |
return w | |
if __name__ == '__main__': | |
O = ['a','c','b'] | |
mu = [[]] | |
w = [[],['a','a','c','c','b']] | |
# R = [[REGLAS 1 REGION],[REGLAS 2 REGION],...,[REGLAS M REGION]] | |
# REGLAS I REGION = ((LHS),(RHS)) | |
# delta -> destruye la membrana, prefijos here,inN,out # | |
R = [[],[(['a'],['bout','bout'])]] | |
i0 = 1 | |
PI = (O,mu,w,R,i0) | |
print p_system(PI) |
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