Refactors construction datums into components (#35894)

code/datums/helper_datums/construction_datum.dm

@@ -1,104 +0,0 @@
-#define FORWARD 1
-#define BACKWARD -1
-
-#define ITEM_DELETE "delete"
-#define ITEM_MOVE_INSIDE "move_inside"
-
-
-/datum/construction
-	var/list/steps
-	var/atom/holder
-	var/result
-	var/index = 1
-
-/datum/construction/New(atom)
-	..()
-	holder = atom
-	if(!holder) //don't want this without a holder
-		qdel(src)
-	update_holder(index)
-
-/datum/construction/proc/on_step()
-	if(index > steps.len)
-		spawn_result()
-	else
-		update_holder(index)
-
-/datum/construction/proc/action(obj/item/I, mob/living/user)
-	return check_step(I, user)
-
-/datum/construction/proc/update_index(diff)
-	index += diff
-	on_step()
-
-/datum/construction/proc/check_step(obj/item/I, mob/living/user)
-	var/diff = is_right_key(I)
-	if(diff && custom_action(I, user, diff))
-		update_index(diff)
-		return TRUE
-	return FALSE
-
-/datum/construction/proc/is_right_key(obj/item/I) // returns index step
-	var/list/L = steps[index]
-	if(check_used_item(I, L["key"]))
-		return FORWARD //to the first step -> forward
-	else if(check_used_item(I, L["back_key"]))
-		return BACKWARD //to the last step -> backwards
-	return FALSE
-
-/datum/construction/proc/check_used_item(obj/item/I, key)
-	if(!key)
-		return FALSE
-
-	if(ispath(key) && istype(I, key))
-		return TRUE
-
-	else if(I.tool_behaviour == key)
-		return TRUE
-
-	return FALSE
-
-/datum/construction/proc/custom_action(obj/item/I, mob/living/user, diff)
-	return TRUE
-
-/datum/construction/proc/spawn_result()
-	if(result)
-		new result(drop_location())
-		qdel(holder)
-
-/datum/construction/proc/update_holder(step_index)
-	var/list/step = steps[step_index]
-
-	if(step["desc"])
-		holder.desc = step["desc"]
-
-	if(step["icon_state"])
-		holder.icon_state = step["icon_state"]
-
-/datum/construction/proc/drop_location()
-	return holder.drop_location()
-
-
-
-// Unordered construction.
-// Takes a list of part types, to be added in any order, as steps.
-// Calls spawn_result() when every type has been added.
-/datum/construction/unordered/check_step(obj/item/I, mob/living/user)
-	for(var/typepath in steps)
-		if(istype(I, typepath) && custom_action(I, user, typepath))
-			steps -= typepath
-			on_step()
-			return TRUE
-	return FALSE
-
-/datum/construction/unordered/on_step()
-	if(!steps.len)
-		spawn_result()
-	else
-		update_holder(steps.len)
-
-/datum/construction/unordered/update_holder(steps_left)
-	return
-
-/datum/construction/unordered/custom_action(obj/item/I, mob/living/user, typepath)
-	return TRUE