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67 lines
1.2 KiB
Plaintext
67 lines
1.2 KiB
Plaintext
/datum/stack
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var/list/stack
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var/max_elements = 0
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/datum/stack/New(list/elements, max)
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..()
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stack = elements ? elements.Copy() : list()
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if(max)
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max_elements = max
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/datum/stack/Destroy()
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Clear()
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. = ..()
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/datum/stack/proc/Pop()
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if(is_empty())
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return null
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. = stack[stack.len]
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stack.Cut(stack.len,0)
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/datum/stack/proc/Push(element)
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if(max_elements && (stack.len+1 > max_elements))
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return null
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stack += element
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/datum/stack/proc/Top()
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if(is_empty())
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return null
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. = stack[stack.len]
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/datum/stack/proc/Remove(element)
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stack -= element
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/datum/stack/proc/is_empty()
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. = stack.len ? 0 : 1
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//Rotate entire stack left with the leftmost looping around to the right
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/datum/stack/proc/RotateLeft()
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if(is_empty())
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return 0
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. = stack[1]
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stack.Cut(1,2)
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Push(.)
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//Rotate entire stack to the right with the rightmost looping around to the left
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/datum/stack/proc/RotateRight()
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if(is_empty())
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return 0
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. = stack[stack.len]
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stack.Cut(stack.len,0)
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stack.Insert(1,.)
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/datum/stack/proc/Copy()
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var/datum/stack/S=new()
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S.stack = stack.Copy()
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S.max_elements = max_elements
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return S
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/datum/stack/proc/Clear()
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stack.Cut()
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/datum/stack/proc/QdelClear()
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for(var/entry in stack)
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qdel(entry)
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stack.Cut()
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