24 lines
341 B
Text
24 lines
341 B
Text
|
-- parent script "Stack"
|
||
|
|
|
||
|
|
property _tos
|
||
|
|
|
||
|
|
on push (me, data)
|
||
|
|
me._tos = [#data:data, #next:me._tos]
|
||
|
|
end
|
||
|
|
|
||
|
|
on pop (me)
|
||
|
|
if voidP(me._tos) then return VOID
|
||
|
|
data = me._tos.data
|
||
|
|
me._tos = me._tos.next
|
||
|
|
return data
|
||
|
|
end
|
||
|
|
|
||
|
|
on peek (me)
|
||
|
|
if voidP(me._tos) then return VOID
|
||
|
|
return me._tos.data
|
||
|
|
end
|
||
|
|
|
||
|
|
on empty (me)
|
||
|
|
return voidP(me.peek())
|
||
|
|
end
|