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console.py
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console.py
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#!/usr/bin/python3
""" Console Module """
import cmd
import sys
import shlex
from models.base_model import BaseModel
from models import storage
from models.user import User
from models.place import Place
from models.state import State
from models.city import City
from models.amenity import Amenity
from models.review import Review
class HBNBCommand(cmd.Cmd):
""" Contains the functionality for the HBNB console"""
# determines prompt for interactive/non-interactive modes
prompt = '(hbnb) ' if sys.__stdin__.isatty() else ''
classes = {
'BaseModel': BaseModel, 'User': User, 'Place': Place,
'State': State, 'City': City, 'Amenity': Amenity,
'Review': Review
}
dot_cmds = ['all', 'count', 'show', 'destroy', 'update']
types = {
'number_rooms': int, 'number_bathrooms': int,
'max_guest': int, 'price_by_night': int,
'latitude': float, 'longitude': float
}
def preloop(self):
"""Prints if isatty is false"""
if not sys.__stdin__.isatty():
print('(hbnb)')
def precmd(self, line):
"""Reformat command line for advanced command syntax.
Usage: <class name>.<command>([<id> [<*args> or <**kwargs>]])
(Brackets denote optional fields in usage example.)
"""
_cmd = _cls = _id = _args = '' # initialize line elements
# scan for general formating - i.e '.', '(', ')'
if not ('.' in line and '(' in line and ')' in line):
return line
try: # parse line left to right
pline = line[:] # parsed line
# isolate <class name>
_cls = pline[:pline.find('.')]
# isolate and validate <command>
_cmd = pline[pline.find('.') + 1:pline.find('(')]
if _cmd not in HBNBCommand.dot_cmds:
raise Exception
# if parantheses contain arguments, parse them
pline = pline[pline.find('(') + 1:pline.find(')')]
if pline:
# partition args: (<id>, [<delim>], [<*args>])
pline = pline.partition(', ') # pline convert to tuple
# isolate _id, stripping quotes
_id = pline[0].replace('\"', '')
# possible bug here:
# empty quotes register as empty _id when replaced
# if arguments exist beyond _id
pline = pline[2].strip() # pline is now str
if pline:
# check for *args or **kwargs
if pline[0] == '{' and pline[-1] =='}'\
and type(eval(pline)) is dict:
_args = pline
else:
_args = pline.replace(',', '')
# _args = _args.replace('\"', '')
line = ' '.join([_cmd, _cls, _id, _args])
except Exception as mess:
pass
finally:
return line
def postcmd(self, stop, line):
"""Prints if isatty is false"""
if not sys.__stdin__.isatty():
print('(hbnb) ', end='')
return stop
def do_quit(self, command):
""" Method to exit the HBNB console"""
exit()
def help_quit(self):
""" Prints the help documentation for quit """
print("Exits the program with formatting\n")
def do_EOF(self, arg):
""" Handles EOF to exit program """
print()
exit()
def help_EOF(self):
""" Prints the help documentation for EOF """
print("Exits the program without formatting\n")
def emptyline(self):
""" Overrides the emptyline method of CMD """
pass
def do_create(self, arg):
""" Create an object of any class
if not args:
print("** class name missing **")
return
elif args not in HBNBCommand.classes:
print("** class doesn't exist **")
return
new_instance = HBNBCommand.classes[args]()
storage.save()
print(new_instance.id)
storage.save()"""
try:
if not arg:
raise SyntaxError()
my_list = arg.split(" ")
obj = eval(my_list[0])()
for index in range(1, len(my_list)):
p_v = self.valid_param(my_list[index])
if p_v:
obj.__dict__[p_v[0]] = p_v[1]
obj.save()
print("{}".format(obj.id))
except SyntaxError:
print("** class name missing **")
except NameError:
print("** class doesn't exist **")
def valid_param(self, arg):
"""validates parameter and returns either None or a tuple
"""
if "=" not in arg:
return None
args = arg.split("=")
key, value = args[0], args[1]
try:
value = eval(args[1])
except Exception:
return None
if type(value) is str:
value = value.replace("_", " ")
return (key, value)
def help_create(self):
""" Help information for the create method """
print("Creates a class of any type")
print("[Usage]: create <className>\n")
def do_show(self, args):
""" Method to show an individual object """
new = args.partition(" ")
c_name = new[0]
c_id = new[2]
# guard against trailing args
if c_id and ' ' in c_id:
c_id = c_id.partition(' ')[0]
if not c_name:
print("** class name missing **")
return
if c_name not in HBNBCommand.classes:
print("** class doesn't exist **")
return
if not c_id:
print("** instance id missing **")
return
key = c_name + "." + c_id
try:
print(storage._FileStorage__objects[key])
except KeyError:
print("** no instance found **")
def help_show(self):
""" Help information for the show command """
print("Shows an individual instance of a class")
print("[Usage]: show <className> <objectId>\n")
def do_destroy(self, args):
""" Destroys a specified object """
new = args.partition(" ")
c_name = new[0]
c_id = new[2]
if c_id and ' ' in c_id:
c_id = c_id.partition(' ')[0]
if not c_name:
print("** class name missing **")
return
if c_name not in HBNBCommand.classes:
print("** class doesn't exist **")
return
if not c_id:
print("** instance id missing **")
return
key = c_name + "." + c_id
try:
del(storage.all()[key])
storage.save()
except KeyError:
print("** no instance found **")
def help_destroy(self):
""" Help information for the destroy command """
print("Destroys an individual instance of a class")
print("[Usage]: destroy <className> <objectId>\n")
def do_all(self, line):
""" Shows all objects, or all objects of a class
print_list = []
if args:
args = args.split(' ')[0] # remove possible trailing args
if args not in HBNBCommand.classes:
print("** class doesn't exist **")
return
for k, v in storage._FileStorage__objects.items():
if k.split('.')[0] == args:
print_list.append(str(v))
else:
for k, v in storage._FileStorage__objects.items():
print_list.append(str(v))
print(print_list)"""
if not line:
o = storage.all()
print([o[k].__str__() for k in o])
return
try:
args = line.split(" ")
if args[0] not in self.classes:
raise NameError()
o = storage.all(eval(args[0]))
print([o[k].__str__() for k in o])
except NameError:
print("** class doesn't exist **")
def help_all(self):
""" Help information for the all command """
print("Shows all objects, or all of a class")
print("[Usage]: all <className>\n")
def do_count(self, args):
"""Count current number of class instances"""
count = 0
for k, v in storage._FileStorage__objects.items():
if args == k.split('.')[0]:
count += 1
print(count)
def help_count(self):
""" """
print("Usage: count <class_name>")
def do_update(self, args):
""" Updates a certain object with new info """
c_name = c_id = att_name = att_val = kwargs = ''
# isolate cls from id/args, ex: (<cls>, delim, <id/args>)
args = args.partition(" ")
if args[0]:
c_name = args[0]
else: # class name not present
print("** class name missing **")
return
if c_name not in HBNBCommand.classes: # class name invalid
print("** class doesn't exist **")
return
# isolate id from args
args = args[2].partition(" ")
if args[0]:
c_id = args[0]
else: # id not present
print("** instance id missing **")
return
# generate key from class and id
key = c_name + "." + c_id
# determine if key is present
if key not in storage.all():
print("** no instance found **")
return
# first determine if kwargs or args
if '{' in args[2] and '}' in args[2] and type(eval(args[2])) is dict:
kwargs = eval(args[2])
args = [] # reformat kwargs into list, ex: [<name>, <value>, ...]
for k, v in kwargs.items():
args.append(k)
args.append(v)
else: # isolate args
args = args[2]
if args and args[0] == '\"': # check for quoted arg
second_quote = args.find('\"', 1)
att_name = args[1:second_quote]
args = args[second_quote + 1:]
args = args.partition(' ')
# if att_name was not quoted arg
if not att_name and args[0] != ' ':
att_name = args[0]
# check for quoted val arg
if args[2] and args[2][0] == '\"':
att_val = args[2][1:args[2].find('\"', 1)]
# if att_val was not quoted arg
if not att_val and args[2]:
att_val = args[2].partition(' ')[0]
args = [att_name, att_val]
# retrieve dictionary of current objects
new_dict = storage.all()[key]
# iterate through attr names and values
for i, att_name in enumerate(args):
# block only runs on even iterations
if (i % 2 == 0):
att_val = args[i + 1] # following item is value
if not att_name: # check for att_name
print("** attribute name missing **")
return
if not att_val: # check for att_value
print("** value missing **")
return
# type cast as necessary
if att_name in HBNBCommand.types:
att_val = HBNBCommand.types[att_name](att_val)
# update dictionary with name, value pair
new_dict.__dict__.update({att_name: att_val})
new_dict.save() # save updates to file
def help_update(self):
""" Help information for the update class """
print("Updates an object with new information")
print("Usage: update <className> <id> <attName> <attVal>\n")
if __name__ == "__main__":
HBNBCommand().cmdloop()