"""
Functions to extend the event system.
These functions are to be used by developers to customize events and callbacks.
"""
from textwrap import dedent
from django.conf import settings
from evennia import logger
from evennia import ScriptDB
from evennia.utils.create import create_script
from evennia.utils.gametime import real_seconds_until as standard_rsu
from evennia.utils.utils import class_from_module
from evennia.contrib.custom_gametime import UNITS
from evennia.contrib.custom_gametime import gametime_to_realtime
from evennia.contrib.custom_gametime import real_seconds_until as custom_rsu
# Temporary storage for events waiting for the script to be started
EVENTS = []
[docs]def get_event_handler():
"""Return the event handler or None."""
try:
script = ScriptDB.objects.get(db_key="event_handler")
except ScriptDB.DoesNotExist:
logger.log_trace("Can't get the event handler.")
script = None
return script
[docs]def register_events(path_or_typeclass):
"""
Register the events in this typeclass.
Args:
path_or_typeclass (str or type): the Python path leading to the
class containing events, or the class itself.
Returns:
The typeclass itself.
Notes:
This function will read events from the `_events` class variable
defined in the typeclass given in parameters. It will add
the events, either to the script if it exists, or to some
temporary storage, waiting for the script to be initialized.
"""
if isinstance(path_or_typeclass, str):
typeclass = class_from_module(path_or_typeclass)
else:
typeclass = path_or_typeclass
typeclass_name = typeclass.__module__ + "." + typeclass.__name__
try:
storage = ScriptDB.objects.get(db_key="event_handler")
assert storage.is_active
assert storage.ndb.events is not None
except (ScriptDB.DoesNotExist, AssertionError):
storage = EVENTS
# If the script is started, add the event directly.
# Otherwise, add it to the temporary storage.
for name, tup in getattr(typeclass, "_events", {}).items():
if len(tup) == 4:
variables, help_text, custom_call, custom_add = tup
elif len(tup) == 3:
variables, help_text, custom_call = tup
custom_add = None
elif len(tup) == 2:
variables, help_text = tup
custom_call = None
custom_add = None
else:
variables = help_text = custom_call = custom_add = None
if isinstance(storage, list):
storage.append((typeclass_name, name, variables, help_text, custom_call, custom_add))
else:
storage.add_event(typeclass_name, name, variables, help_text, custom_call, custom_add)
return typeclass
# Custom callbacks for specific event types
[docs]def get_next_wait(format):
"""
Get the length of time in seconds before format.
Args:
format (str): a time format matching the set calendar.
Returns:
until (int or float): the number of seconds until the event.
usual (int or float): the usual number of seconds between events.
format (str): a string format representing the time.
Notes:
The time format could be something like "2018-01-08 12:00". The
number of units set in the calendar affects the way seconds are
calculated.
"""
calendar = getattr(settings, "EVENTS_CALENDAR", None)
if calendar is None:
logger.log_err(
"A time-related event has been set whereas "
"the gametime calendar has not been set in the settings."
)
return
elif calendar == "standard":
rsu = standard_rsu
units = ["min", "hour", "day", "month", "year"]
elif calendar == "custom":
rsu = custom_rsu
back = dict([(value, name) for name, value in UNITS.items()])
sorted_units = sorted(back.items())
del sorted_units[0]
units = [n for v, n in sorted_units]
params = {}
for delimiter in ("-", ":"):
format = format.replace(delimiter, " ")
pieces = list(reversed(format.split()))
details = []
i = 0
for uname in units:
try:
piece = pieces[i]
except IndexError:
break
if not piece.isdigit():
logger.log_trace(
"The time specified '{}' in {} isn't " "a valid number".format(piece, format)
)
return
# Convert the piece to int
piece = int(piece)
params[uname] = piece
details.append("{}={}".format(uname, piece))
if i < len(units):
next_unit = units[i + 1]
else:
next_unit = None
i += 1
params["sec"] = 0
details = " ".join(details)
until = rsu(**params)
usual = -1
if next_unit:
kwargs = {next_unit: 1}
usual = gametime_to_realtime(**kwargs)
return until, usual, details
[docs]def time_event(obj, event_name, number, parameters):
"""
Create a time-related event.
Args:
obj (Object): the object on which sits the event.
event_name (str): the event's name.
number (int): the number of the event.
parameters (str): the parameter of the event.
"""
seconds, usual, key = get_next_wait(parameters)
script = create_script(
"evennia.contrib.ingame_python.scripts.TimeEventScript", interval=seconds, obj=obj
)
script.key = key
script.desc = "event on {}".format(key)
script.db.time_format = parameters
script.db.number = number
script.ndb.usual = usual
[docs]def keyword_event(callbacks, parameters):
"""
Custom call for events with keywords (like push, or pull, or turn...).
Args:
callbacks (list of dict): the list of callbacks to be called.
parameters (str): the actual parameters entered to trigger the callback.
Returns:
A list containing the callback dictionaries to be called.
Notes:
This function should be imported and added as a custom_call
parameter to add the event when the event supports keywords
as parameters. Keywords in parameters are one or more words
separated by a comma. For instance, a 'push 1, one' callback can
be set to trigger when the player 'push 1' or 'push one'.
"""
key = parameters.strip().lower()
to_call = []
for callback in callbacks:
keys = callback["parameters"]
if not keys or key in [p.strip().lower() for p in keys.split(",")]:
to_call.append(callback)
return to_call
[docs]def phrase_event(callbacks, parameters):
"""
Custom call for events with keywords in sentences (like say or whisper).
Args:
callbacks (list of dict): the list of callbacks to be called.
parameters (str): the actual parameters entered to trigger the callback.
Returns:
A list containing the callback dictionaries to be called.
Notes:
This function should be imported and added as a custom_call
parameter to add the event when the event supports keywords
in phrases as parameters. Keywords in parameters are one or more
words separated by a comma. For instance, a 'say yes, okay' callback
can be set to trigger when the player says something containing
either "yes" or "okay" (maybe 'say I don't like it, but okay').
"""
phrase = parameters.strip().lower()
# Remove punctuation marks
punctuations = ',.";?!'
for p in punctuations:
phrase = phrase.replace(p, " ")
words = phrase.split()
words = [w.strip("' ") for w in words if w.strip("' ")]
to_call = []
for callback in callbacks:
keys = callback["parameters"]
if not keys or any(key.strip().lower() in words for key in keys.split(",")):
to_call.append(callback)
return to_call
[docs]class InterruptEvent(RuntimeError):
"""
Interrupt the current event.
You shouldn't have to use this exception directly, probably use the
`deny()` function that handles it instead.
"""
pass
