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/**
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* # Component
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*
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* The component datum
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*
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* A component should be a single standalone unit
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* of functionality, that works by receiving signals from it's parent
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* object to provide some single functionality (i.e a slippery component)
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* that makes the object it's attached to cause people to slip over.
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* Useful when you want shared behaviour independent of type inheritance
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*/
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/datum/component
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/**
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* Defines how duplicate existing components are handled when added to a datum
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*
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* See [COMPONENT_DUPE_*][COMPONENT_DUPE_ALLOWED] definitions for available options
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*/
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var/dupe_mode = COMPONENT_DUPE_HIGHLANDER
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/**
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* The type to check for duplication
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*
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* `null` means exact match on `type` (default)
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*
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* Any other type means that and all subtypes
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*/
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var/dupe_type
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/// The datum this components belongs to
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var/datum/parent
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/**
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* Only set to true if you are able to properly transfer this component
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*
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* At a minimum [RegisterWithParent][/datum/component/proc/RegisterWithParent] and [UnregisterFromParent][/datum/component/proc/UnregisterFromParent] should be used
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*
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* Make sure you also implement [PostTransfer][/datum/component/proc/PostTransfer] for any post transfer handling
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*/
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var/can_transfer = FALSE
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/**
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* Create a new component.
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*
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* Additional arguments are passed to [Initialize()][/datum/component/proc/Initialize]
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*
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* Arguments:
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* * datum/P the parent datum this component reacts to signals from
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*/
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/datum/component/New(list/raw_args)
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parent = raw_args[1]
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var/list/arguments = raw_args.Copy(2)
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if(Initialize(arglist(arguments)) == COMPONENT_INCOMPATIBLE)
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stack_trace("Incompatible [type] assigned to a [parent.type]! args: [json_encode(arguments)]")
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qdel(src, TRUE, TRUE)
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return
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_JoinParent(parent)
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/**
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* Called during component creation with the same arguments as in new excluding parent.
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*
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* Do not call `qdel(src)` from this function, `return COMPONENT_INCOMPATIBLE` instead
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*/
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/datum/component/proc/Initialize(...)
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return
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/**
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* Properly removes the component from `parent` and cleans up references
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*
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* Arguments:
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* * force - makes it not check for and remove the component from the parent
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* * silent - deletes the component without sending a [COMSIG_COMPONENT_REMOVING] signal
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*/
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/datum/component/Destroy(force=FALSE, silent=FALSE)
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if(!force && parent)
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_RemoveFromParent()
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if(!silent)
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SEND_SIGNAL(parent, COMSIG_COMPONENT_REMOVING, src)
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parent = null
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return ..()
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/**
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* Internal proc to handle behaviour of components when joining a parent
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*/
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/datum/component/proc/_JoinParent()
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var/datum/P = parent
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//lazy init the parent's dc list
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var/list/dc = P.datum_components
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if(!dc)
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P.datum_components = dc = list()
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//set up the typecache
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var/our_type = type
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for(var/I in _GetInverseTypeList(our_type))
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var/test = dc[I]
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if(test) //already another component of this type here
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var/list/components_of_type
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if(!length(test))
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components_of_type = list(test)
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dc[I] = components_of_type
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else
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components_of_type = test
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if(I == our_type) //exact match, take priority
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var/inserted = FALSE
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for(var/J in 1 to components_of_type.len)
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var/datum/component/C = components_of_type[J]
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if(C.type != our_type) //but not over other exact matches
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components_of_type.Insert(J, I)
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inserted = TRUE
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break
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if(!inserted)
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components_of_type += src
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else //indirect match, back of the line with ya
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components_of_type += src
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else //only component of this type, no list
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dc[I] = src
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RegisterWithParent()
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/**
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* Internal proc to handle behaviour when being removed from a parent
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*/
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/datum/component/proc/_RemoveFromParent()
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var/datum/P = parent
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var/list/dc = P.datum_components
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for(var/I in _GetInverseTypeList())
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var/list/components_of_type = dc[I]
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if(length(components_of_type)) //
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var/list/subtracted = components_of_type - src
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if(subtracted.len == 1) //only 1 guy left
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dc[I] = subtracted[1] //make him special
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else
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dc[I] = subtracted
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else //just us
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dc -= I
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if(!dc.len)
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P.datum_components = null
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UnregisterFromParent()
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/**
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* Register the component with the parent object
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*
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* Use this proc to register with your parent object
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*
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* Overridable proc that's called when added to a new parent
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*/
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/datum/component/proc/RegisterWithParent()
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return
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/**
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* Unregister from our parent object
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*
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* Use this proc to unregister from your parent object
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*
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* Overridable proc that's called when removed from a parent
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* *
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*/
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/datum/component/proc/UnregisterFromParent()
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return
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/**
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* Register to listen for a signal from the passed in target
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*
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* This sets up a listening relationship such that when the target object emits a signal
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* the source datum this proc is called upon, will recieve a callback to the given proctype
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* Return values from procs registered must be a bitfield
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*
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* Arguments:
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* * datum/target The target to listen for signals from
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* * sig_type_or_types Either a string signal name, or a list of signal names (strings)
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* * proctype The proc to call back when the signal is emitted
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* * override If a previous registration exists you must explicitly set this
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*/
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/datum/proc/RegisterSignal(datum/target, sig_type_or_types, proctype, override = FALSE)
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if(QDELETED(src) || QDELETED(target))
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return
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var/list/procs = signal_procs
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if(!procs)
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signal_procs = procs = list()
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if(!procs[target])
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procs[target] = list()
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var/list/lookup = target.comp_lookup
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if(!lookup)
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target.comp_lookup = lookup = list()
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var/list/sig_types = islist(sig_type_or_types) ? sig_type_or_types : list(sig_type_or_types)
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for(var/sig_type in sig_types)
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if(!override && procs[target][sig_type])
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stack_trace("[sig_type] overridden. Use override = TRUE to suppress this warning")
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procs[target][sig_type] = proctype
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if(!lookup[sig_type]) // Nothing has registered here yet
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lookup[sig_type] = src
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else if(lookup[sig_type] == src) // We already registered here
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continue
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else if(!length(lookup[sig_type])) // One other thing registered here
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lookup[sig_type] = list(lookup[sig_type]=TRUE)
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lookup[sig_type][src] = TRUE
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else // Many other things have registered here
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lookup[sig_type][src] = TRUE
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signal_enabled = TRUE
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/**
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* Stop listening to a given signal from target
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*
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* Breaks the relationship between target and source datum, removing the callback when the signal fires
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*
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* Doesn't care if a registration exists or not
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*
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* Arguments:
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* * datum/target Datum to stop listening to signals from
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* * sig_typeor_types Signal string key or list of signal keys to stop listening to specifically
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*/
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/datum/proc/UnregisterSignal(datum/target, sig_type_or_types)
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var/list/lookup = target.comp_lookup
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if(!signal_procs || !signal_procs[target] || !lookup)
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return
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if(!islist(sig_type_or_types))
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sig_type_or_types = list(sig_type_or_types)
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for(var/sig in sig_type_or_types)
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if(!signal_procs[target][sig])
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continue
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switch(length(lookup[sig]))
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if(2)
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lookup[sig] = (lookup[sig]-src)[1]
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if(1)
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stack_trace("[target] ([target.type]) somehow has single length list inside comp_lookup")
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if(src in lookup[sig])
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lookup -= sig
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if(!length(lookup))
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target.comp_lookup = null
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break
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if(0)
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lookup -= sig
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if(!length(lookup))
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target.comp_lookup = null
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break
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else
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lookup[sig] -= src
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signal_procs[target] -= sig_type_or_types
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if(!signal_procs[target].len)
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signal_procs -= target
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/**
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* Called on a component when a component of the same type was added to the same parent
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*
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* See [/datum/component/var/dupe_mode]
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*
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* `C`'s type will always be the same of the called component
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*/
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/datum/component/proc/InheritComponent(datum/component/C, i_am_original)
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return
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/**
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* Called on a component when a component of the same type was added to the same parent with [COMPONENT_DUPE_SELECTIVE]
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*
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* See [/datum/component/var/dupe_mode]
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*
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* `C`'s type will always be the same of the called component
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*
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* return TRUE if you are absorbing the component, otherwise FALSE if you are fine having it exist as a duplicate component
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*/
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/datum/component/proc/CheckDupeComponent(datum/component/C, ...)
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return
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/**
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* Callback Just before this component is transferred
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*
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* Use this to do any special cleanup you might need to do before being deregged from an object
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*/
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/datum/component/proc/PreTransfer()
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return
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/**
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* Callback Just after a component is transferred
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*
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* Use this to do any special setup you need to do after being moved to a new object
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*
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* Do not call `qdel(src)` from this function, `return COMPONENT_INCOMPATIBLE` instead
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*/
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/datum/component/proc/PostTransfer()
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return COMPONENT_INCOMPATIBLE //Do not support transfer by default as you must properly support it
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/**
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* Internal proc to create a list of our type and all parent types
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*/
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/datum/component/proc/_GetInverseTypeList(our_type = type)
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//we can do this one simple trick
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var/current_type = parent_type
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. = list(our_type, current_type)
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//and since most components are root level + 1, this won't even have to run
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while (current_type != /datum/component)
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current_type = type2parent(current_type)
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. += current_type
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/**
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* Internal proc to handle most all of the signaling procedure
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*
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* Will runtime if used on datums with an empty component list
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*
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* Use the [SEND_SIGNAL] define instead
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*/
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/datum/proc/_SendSignal(sigtype, list/arguments)
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var/target = comp_lookup[sigtype]
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if(!length(target))
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var/datum/C = target
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if(!C.signal_enabled)
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return NONE
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var/proctype = C.signal_procs[src][sigtype]
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return NONE | CallAsync(C, proctype, arguments)
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. = NONE
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for(var/I in target)
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var/datum/C = I
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if(!C.signal_enabled)
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continue
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var/proctype = C.signal_procs[src][sigtype]
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. |= CallAsync(C, proctype, arguments)
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// The type arg is casted so initial works, you shouldn't be passing a real instance into this
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/**
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* Return any component assigned to this datum of the given type
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*
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* This will throw an error if it's possible to have more than one component of that type on the parent
|
|
|
|
|
*
|
|
|
|
|
* Arguments:
|
|
|
|
|
* * datum/component/c_type The typepath of the component you want to get a reference to
|
|
|
|
|
*/
|
|
|
|
|
/datum/proc/GetComponent(datum/component/c_type)
|
|
|
|
|
// RETURN_TYPE(c_type)
|
|
|
|
|
if(initial(c_type.dupe_mode) == COMPONENT_DUPE_ALLOWED || initial(c_type.dupe_mode) == COMPONENT_DUPE_SELECTIVE)
|
|
|
|
|
stack_trace("GetComponent was called to get a component of which multiple copies could be on an object. This can easily break and should be changed. Type: \[[c_type]\]")
|
|
|
|
|
var/list/dc = datum_components
|
|
|
|
|
if(!dc)
|
|
|
|
|
return null
|
|
|
|
|
. = dc[c_type]
|
|
|
|
|
if(length(.))
|
|
|
|
|
return .[1]
|
|
|
|
|
|
|
|
|
|
// The type arg is casted so initial works, you shouldn't be passing a real instance into this
|
|
|
|
|
/**
|
|
|
|
|
* Return any component assigned to this datum of the exact given type
|
|
|
|
|
*
|
|
|
|
|
* This will throw an error if it's possible to have more than one component of that type on the parent
|
|
|
|
|
*
|
|
|
|
|
* Arguments:
|
|
|
|
|
* * datum/component/c_type The typepath of the component you want to get a reference to
|
|
|
|
|
*/
|
|
|
|
|
/datum/proc/GetExactComponent(datum/component/c_type)
|
|
|
|
|
// RETURN_TYPE(c_type)
|
|
|
|
|
if(initial(c_type.dupe_mode) == COMPONENT_DUPE_ALLOWED || initial(c_type.dupe_mode) == COMPONENT_DUPE_SELECTIVE)
|
|
|
|
|
stack_trace("GetComponent was called to get a component of which multiple copies could be on an object. This can easily break and should be changed. Type: \[[c_type]\]")
|
|
|
|
|
var/list/dc = datum_components
|
|
|
|
|
if(!dc)
|
|
|
|
|
return null
|
|
|
|
|
var/datum/component/C = dc[c_type]
|
|
|
|
|
if(C)
|
|
|
|
|
if(length(C))
|
|
|
|
|
C = C[1]
|
|
|
|
|
if(C.type == c_type)
|
|
|
|
|
return C
|
|
|
|
|
return null
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Get all components of a given type that are attached to this datum
|
|
|
|
|
*
|
|
|
|
|
* Arguments:
|
|
|
|
|
* * c_type The component type path
|
|
|
|
|
*/
|
|
|
|
|
/datum/proc/GetComponents(c_type)
|
|
|
|
|
var/list/dc = datum_components
|
|
|
|
|
if(!dc)
|
|
|
|
|
return null
|
|
|
|
|
. = dc[c_type]
|
|
|
|
|
if(!length(.))
|
|
|
|
|
return list(.)
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Creates an instance of `new_type` in the datum and attaches to it as parent
|
|
|
|
|
*
|
|
|
|
|
* Sends the [COMSIG_COMPONENT_ADDED] signal to the datum
|
|
|
|
|
*
|
|
|
|
|
* Returns the component that was created. Or the old component in a dupe situation where [COMPONENT_DUPE_UNIQUE] was set
|
|
|
|
|
*
|
|
|
|
|
* If this tries to add a component to an incompatible type, the component will be deleted and the result will be `null`. This is very unperformant, try not to do it
|
|
|
|
|
*
|
|
|
|
|
* Properly handles duplicate situations based on the `dupe_mode` var
|
|
|
|
|
*/
|
|
|
|
|
/datum/proc/_AddComponent(list/raw_args)
|
|
|
|
|
var/new_type = raw_args[1]
|
|
|
|
|
var/datum/component/nt = new_type
|
|
|
|
|
var/dm = initial(nt.dupe_mode)
|
|
|
|
|
var/dt = initial(nt.dupe_type)
|
|
|
|
|
|
|
|
|
|
var/datum/component/old_comp
|
|
|
|
|
var/datum/component/new_comp
|
|
|
|
|
|
|
|
|
|
if(ispath(nt))
|
|
|
|
|
if(nt == /datum/component)
|
|
|
|
|
CRASH("[nt] attempted instantiation!")
|
|
|
|
|
else
|
|
|
|
|
new_comp = nt
|
|
|
|
|
nt = new_comp.type
|
|
|
|
|
|
|
|
|
|
raw_args[1] = src
|
|
|
|
|
|
|
|
|
|
if(dm != COMPONENT_DUPE_ALLOWED)
|
|
|
|
|
if(!dt)
|
|
|
|
|
old_comp = GetExactComponent(nt)
|
|
|
|
|
else
|
|
|
|
|
old_comp = GetComponent(dt)
|
|
|
|
|
if(old_comp)
|
|
|
|
|
switch(dm)
|
|
|
|
|
if(COMPONENT_DUPE_UNIQUE)
|
|
|
|
|
if(!new_comp)
|
|
|
|
|
new_comp = new nt(raw_args)
|
|
|
|
|
if(!QDELETED(new_comp))
|
|
|
|
|
old_comp.InheritComponent(new_comp, TRUE)
|
|
|
|
|
QDEL_NULL(new_comp)
|
|
|
|
|
if(COMPONENT_DUPE_HIGHLANDER)
|
|
|
|
|
if(!new_comp)
|
|
|
|
|
new_comp = new nt(raw_args)
|
|
|
|
|
if(!QDELETED(new_comp))
|
|
|
|
|
new_comp.InheritComponent(old_comp, FALSE)
|
|
|
|
|
QDEL_NULL(old_comp)
|
|
|
|
|
if(COMPONENT_DUPE_UNIQUE_PASSARGS)
|
|
|
|
|
if(!new_comp)
|
|
|
|
|
var/list/arguments = raw_args.Copy(2)
|
|
|
|
|
arguments.Insert(1, null, TRUE)
|
|
|
|
|
old_comp.InheritComponent(arglist(arguments))
|
|
|
|
|
else
|
|
|
|
|
old_comp.InheritComponent(new_comp, TRUE)
|
|
|
|
|
if(COMPONENT_DUPE_SELECTIVE)
|
|
|
|
|
var/list/arguments = raw_args.Copy()
|
|
|
|
|
arguments[1] = new_comp
|
|
|
|
|
var/make_new_component = TRUE
|
|
|
|
|
for(var/i in GetComponents(new_type))
|
|
|
|
|
var/datum/component/C = i
|
|
|
|
|
if(C.CheckDupeComponent(arglist(arguments)))
|
|
|
|
|
make_new_component = FALSE
|
|
|
|
|
QDEL_NULL(new_comp)
|
|
|
|
|
break
|
|
|
|
|
if(!new_comp && make_new_component)
|
|
|
|
|
new_comp = new nt(raw_args)
|
|
|
|
|
else if(!new_comp)
|
|
|
|
|
new_comp = new nt(raw_args) // There's a valid dupe mode but there's no old component, act like normal
|
|
|
|
|
else if(!new_comp)
|
|
|
|
|
new_comp = new nt(raw_args) // Dupes are allowed, act like normal
|
|
|
|
|
|
|
|
|
|
if(!old_comp && !QDELETED(new_comp)) // Nothing related to duplicate components happened and the new component is healthy
|
|
|
|
|
SEND_SIGNAL(src, COMSIG_COMPONENT_ADDED, new_comp)
|
|
|
|
|
return new_comp
|
|
|
|
|
return old_comp
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Get existing component of type, or create it and return a reference to it
|
|
|
|
|
*
|
|
|
|
|
* Use this if the item needs to exist at the time of this call, but may not have been created before now
|
|
|
|
|
*
|
|
|
|
|
* Arguments:
|
|
|
|
|
* * component_type The typepath of the component to create or return
|
|
|
|
|
* * ... additional arguments to be passed when creating the component if it does not exist
|
|
|
|
|
*/
|
|
|
|
|
/datum/proc/LoadComponent(component_type, ...)
|
|
|
|
|
. = GetComponent(component_type)
|
|
|
|
|
if(!.)
|
|
|
|
|
return _AddComponent(args)
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Removes the component from parent, ends up with a null parent
|
|
|
|
|
*/
|
|
|
|
|
/datum/component/proc/RemoveComponent()
|
|
|
|
|
if(!parent)
|
|
|
|
|
return
|
|
|
|
|
var/datum/old_parent = parent
|
|
|
|
|
PreTransfer()
|
|
|
|
|
_RemoveFromParent()
|
|
|
|
|
parent = null
|
|
|
|
|
SEND_SIGNAL(old_parent, COMSIG_COMPONENT_REMOVING, src)
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Transfer this component to another parent
|
|
|
|
|
*
|
|
|
|
|
* Component is taken from source datum
|
|
|
|
|
*
|
|
|
|
|
* Arguments:
|
|
|
|
|
* * datum/component/target Target datum to transfer to
|
|
|
|
|
*/
|
|
|
|
|
/datum/proc/TakeComponent(datum/component/target)
|
|
|
|
|
if(!target || target.parent == src)
|
|
|
|
|
return
|
|
|
|
|
if(target.parent)
|
|
|
|
|
target.RemoveComponent()
|
|
|
|
|
target.parent = src
|
|
|
|
|
var/result = target.PostTransfer()
|
|
|
|
|
switch(result)
|
|
|
|
|
if(COMPONENT_INCOMPATIBLE)
|
|
|
|
|
var/c_type = target.type
|
|
|
|
|
qdel(target)
|
|
|
|
|
CRASH("Incompatible [c_type] transfer attempt to a [type]!")
|
|
|
|
|
|
|
|
|
|
if(target == AddComponent(target))
|
|
|
|
|
target._JoinParent()
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Transfer all components to target
|
|
|
|
|
*
|
|
|
|
|
* All components from source datum are taken
|
|
|
|
|
*
|
|
|
|
|
* Arguments:
|
|
|
|
|
* * /datum/target the target to move the components to
|
|
|
|
|
*/
|
|
|
|
|
/datum/proc/TransferComponents(datum/target)
|
|
|
|
|
var/list/dc = datum_components
|
|
|
|
|
if(!dc)
|
|
|
|
|
return
|
|
|
|
|
var/comps = dc[/datum/component]
|
|
|
|
|
if(islist(comps))
|
|
|
|
|
for(var/datum/component/I in comps)
|
|
|
|
|
if(I.can_transfer)
|
|
|
|
|
target.TakeComponent(I)
|
|
|
|
|
else
|
|
|
|
|
var/datum/component/C = comps
|
|
|
|
|
if(C.can_transfer)
|
|
|
|
|
target.TakeComponent(comps)
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Return the object that is the host of any UI's that this component has
|
|
|
|
|
*/
|
|
|
|
|
/datum/component/tgui_host()
|
|
|
|
|
return parent
|
ShadowLarkens