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console.py
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console.py
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#!/usr/bin/python3
"""
Implementing the console for the I-Share Project
"""
import re
import cmd
import shlex
import models
from models.base import BaseModel
from sqlalchemy.orm import sessionmaker, scoped_session
class QQuizCommand(cmd.Cmd):
"""
Contains the entry point of the command interpreter.
"""
prompt = ("(Qquiz) ")
def do_quit(self, args):
"""
Quit command to exit the program.
"""
return True
def do_EOF(self, args):
"""
Exits after receiving the EOF signal.
"""
return True
def do_create(self, args):
"""
Create a new instance of class BaseModel and saves it
to the JSON file.
"""
if len(args) == 0:
print("** class name missing **")
return
try:
args = re.split(r"\s|=", args)
new_instance = eval(args[0])()
for idx in range(1, len(args), 2):
key = args[idx]
value = args[idx + 1]
try:
new_instance.__getattribute__(key)
except AttributeError:
continue
if re.search("^\".*\"$|^\'.*\'$", value) is not None:
value = value.replace("_", " ")
value = value.replace("\"", "")
value = value.replace("\'", "")
elif re.search('[+-]?[0-9]+\.[0-9]+', value) is not None:
value = float(value)
elif re.search(r"\d.*", value) is not None:
value = int(value)
else:
continue
setattr(new_instance, key, value)
new_instance.save()
print(new_instance.id)
except NameError:
print("** class doesn't exist **")
return
def do_show(self, args):
"""
Print the string representation of an instance baed on
the class name and id given as args.
"""
args = shlex.split(args)
if len(args) == 0:
print("** class name missing **")
return
if len(args) == 1:
print("** instance id missing **")
return
storage = models.storage
storage.reload()
obj_dict = storage.all()
try:
eval(args[0])
except NameError:
print("** class doesn't exist **")
return
key = args[0] + "." + args[1]
try:
value = obj_dict[key]
print(value)
except KeyError:
print("** no instance found **")
def do_destroy(self, args):
"""
Deletes an instance based on the class name and id.
"""
args = shlex.split(args)
if len(args) == 0:
print("** class name missing **")
return
elif len(args) == 1:
print("** instance id missing **")
return
class_name = args[0]
class_id = args[1]
try:
eval(class_name)
except NameError:
print("** class doesn't exist **")
return
storage = models.storage
storage.reload()
obj_dict = storage.all(class_name)
key = class_name + "." + class_id
delete__obj = obj_dict[key]
try:
del obj_dict[key]
except KeyError:
print("** no instance found **")
storage.delete(delete__obj)
def do_all(self, args):
"""
Prints all string representation of all instances
based or not on the class name.
"""
obj_list = []
storage = models.storage
storage.reload()
try:
if len(args) != 0:
eval(args)
if len(args) == 0:
objects = storage.all()
else:
objects = storage.all(args)
except NameError:
print("** class doesn't exist **")
return
for key, val in objects.items():
if len(args) != 0:
if type(val) is eval(args):
obj_list.append(val)
else:
obj_list.append(val)
print(obj_list)
def do_update(self, args):
"""
Update an instance based on the class name and id
sent as args.
"""
storage = models.storage
storage.reload()
args = shlex.split(args)
if len(args) == 0:
print("** class name missing **")
return
elif len(args) == 1:
print("** instance id missing **")
return
elif len(args) == 2:
print("** attribute name missing **")
return
elif len(args) == 3:
print("** value missing **")
return
try:
eval(args[0])
except NameError:
print("** class doesn't exist **")
return
key = args[0] + "." + args[1]
obj_dict = storage.all()
try:
obj_value = obj_dict[key]
except KeyError:
print("** no instance found **")
return
try:
attr_type = type(getattr(obj_value, args[2]))
args[3] = attr_type(args[3])
except AttributeError:
pass
setattr(obj_value, args[2], args[3])
obj_value.save()
def emptyline(self):
"""
Prevents printing anything when an empty line is passed.
"""
pass
def do_count(self, args):
"""
Counts/retrieves the number of instances.
"""
obj_list = []
storage = models.storage
storage.reload()
objects = storage.all()
try:
if len(args) != 0:
eval(args)
except NameError:
print("** class doesn't exist **")
return
for key, val in objects.items():
if len(args) != 0:
if type(val) is eval(args):
obj_list.append(val)
else:
obj_list.append(val)
print(len(obj_list))
def default(self, args):
"""
Catches all the function names that are not expicitly defined.
"""
functions = {"all": self.do_all, "update": self.do_update,
"show": self.do_show, "count": self.do_count,
"destroy": self.do_destroy, "update": self.do_update}
args = (args.replace("(", ".").replace(")", ".")
.replace('"', "").replace(",", "").split("."))
try:
cmd_arg = args[0] + " " + args[2]
func = functions[args[1]]
func(cmd_arg)
except Exception as ex:
print("*** Unknown syntax:", args[0])
if __name__ == "__main__":
"""
Entry point for the loop.
"""
QquizCommand().cmdloop()