scripts.py
4.27 KB
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"""
Scripts
Scripts are powerful jacks-of-all-trades. They have no in-game
existence and can be used to represent persistent game systems in some
circumstances. Scripts can also have a time component that allows them
to "fire" regularly or a limited number of times.
There is generally no "tree" of Scripts inheriting from each other.
Rather, each script tends to inherit from the base Script class and
just overloads its hooks to have it perform its function.
"""
from evennia import DefaultScript
class Script(DefaultScript):
"""
A script type is customized by redefining some or all of its hook
methods and variables.
* available properties
key (string) - name of object
name (string)- same as key
aliases (list of strings) - aliases to the object. Will be saved
to database as AliasDB entries but returned as strings.
dbref (int, read-only) - unique #id-number. Also "id" can be used.
date_created (string) - time stamp of object creation
permissions (list of strings) - list of permission strings
desc (string) - optional description of script, shown in listings
obj (Object) - optional object that this script is connected to
and acts on (set automatically by obj.scripts.add())
interval (int) - how often script should run, in seconds. <0 turns
off ticker
start_delay (bool) - if the script should start repeating right away or
wait self.interval seconds
repeats (int) - how many times the script should repeat before
stopping. 0 means infinite repeats
persistent (bool) - if script should survive a server shutdown or not
is_active (bool) - if script is currently running
* Handlers
locks - lock-handler: use locks.add() to add new lock strings
db - attribute-handler: store/retrieve database attributes on this
self.db.myattr=val, val=self.db.myattr
ndb - non-persistent attribute handler: same as db but does not
create a database entry when storing data
* Helper methods
start() - start script (this usually happens automatically at creation
and obj.script.add() etc)
stop() - stop script, and delete it
pause() - put the script on hold, until unpause() is called. If script
is persistent, the pause state will survive a shutdown.
unpause() - restart a previously paused script. The script will continue
from the paused timer (but at_start() will be called).
time_until_next_repeat() - if a timed script (interval>0), returns time
until next tick
* Hook methods (should also include self as the first argument):
at_script_creation() - called only once, when an object of this
class is first created.
is_valid() - is called to check if the script is valid to be running
at the current time. If is_valid() returns False, the running
script is stopped and removed from the game. You can use this
to check state changes (i.e. an script tracking some combat
stats at regular intervals is only valid to run while there is
actual combat going on).
at_start() - Called every time the script is started, which for persistent
scripts is at least once every server start. Note that this is
unaffected by self.delay_start, which only delays the first
call to at_repeat().
at_repeat() - Called every self.interval seconds. It will be called
immediately upon launch unless self.delay_start is True, which
will delay the first call of this method by self.interval
seconds. If self.interval==0, this method will never
be called.
at_stop() - Called as the script object is stopped and is about to be
removed from the game, e.g. because is_valid() returned False.
at_server_reload() - Called when server reloads. Can be used to
save temporary variables you want should survive a reload.
at_server_shutdown() - called at a full server shutdown.
"""
pass