def ask(self, q):
e = expr(q)
vars = variables(e)
ans = fol_bc_ask(self, [e])
res = []
for a in ans:
res.append(dict([(x, v) for (x, v) in a.items() if x in vars]))
res.sort(key=str)
if res == []:
return False
for r in res:
if r != {}:
return res
return True # res is a list of empty dicts
def ask(self, q):
e = expr(q)
vars = variables(e)
ans = fol_bc_ask(self, [e])
res = []
for a in ans:
res.append(dict([(x, v) for (x, v) in a.items() if x in vars]))
res.sort(key=str)
if res == []:
return False
for r in res:
if r != {}:
return res
return True # res is a list of empty dicts
def pylog_console():
flag = True
kb = []
unifs = []
vars = []
kb_file = ''
next_unif = 0
manual = "load <filename>.\nLoads a prolog file (.pl only).\n\n" \
"listing.\nPrints the knowledge base.\n\n" \
"help.\nOpens the manual page.\n\n" \
"exit.\nExits the prolog command line.\n\n" \
"Everything else that ends with \'.\' is conidered a query. " \
"\nPressing the Enter key you can see an answer to your query.\n" \
"Using \';\' afterwards you can ask for another answer."
c = 1
print("~~~~~~~~~~~~~~~~~~~~ WELCOME TO PYLOG ~~~~~~~~~~~~~~~~~~~~\n\nUse \'help.\' to see the manual")
while flag:
inputt = input("\n" + str(c) + ". ?- ")
inputt.strip('')
if inputt[-1] != '.':
print("Sorry bro you missed the dot! Repeat the command again using a \".\" at the end!")
elif inputt == "help.":
print(manual)
c += 1
elif inputt == "listing.":
if kb_file != '':
for k in kb:
print(k)
c += 1
else:
print("You have not loaded a file yet! Please load your file first with the command\n"
"load <name of your file>")
elif inputt.startswith("load"):
kb_file = inputt.split()[1][:-1]
if kb_file[-3:] != ".pl":
print("You were supposed to load ONLY PROLOG FILES (.pl)!!! Please try again!!!")
else:
if os.path.exists(kb_file):
try:
kb = logic.createKB(kb_file)
print("Your file was loaded successfully")
c += 1
except parse.CommandException as e:
print(e)
else:
print("Sorry! The file you tried to access does not exist.")
elif inputt == "exit.":
flag = False
elif '=' in inputt:
index = inputt.find('=')
if index == 0 or index == len(inputt) - 1:
print("Well..you just gave me a totally wrong command to check equality...try again!")
else:
cmd1 = inputt[0:index].strip(' =')
cmd2 = inputt[index:].strip(' =.')
left = parse.Lexer(cmd1).parse_line()
right = parse.Lexer(cmd2).parse_line()
# estw oti ola kala stn parse_line...
unifier = logic.unify(left, right, {})
vars = left.getVars()
vars.extend(right.getVars())
if unifier is False:
print("no.")
else:
print_next_unif([unifier], vars, 0)
print("\nyes.")
c += 1
else:
stripped = inputt.strip()
try:
command = parse.Lexer(stripped).parse_line()
except parse.CommandException as e:
print(e)
vars = command.getVars()
unifs = logic.fol_bc_ask(kb, [command], {})
next_unif = 1
if not unifs or unifs[0] is False:
print('no.')
else:
if vars == []:
print('yes.')
else:
print_next_unif(unifs, vars, 0)
inputt = input("")
while inputt == ';' or inputt == ';':
print_next_unif(unifs, vars, next_unif)
next_unif += 1
if next_unif > len(unifs) or inputt == '':
break
inputt = input("")
c += 1
