try to get the current cursor position without removing the node
class List(object):
___slot___=('cursor', 'size')
def __init__(self):
self.cursor=EmptyCircleNode()
self.size=0
def __str__(self):
result = "<"
node = self.cursor
count = self.size
while count != 0:
result = result + str(node.data)
if count != 1:
result = result + ", "
node = node.next
count -= 1
result = result + ">"
return result
class EmptyCircleNode(object):
___slot___=()
class CircleNode(object):
___slots___=('data', 'next')
def __init__(self, datavalue,nextnode):
self.data=datavalue
self.next=nextnode
def add(element,circle):
newNode = CircleNode(element, EmptyCircleNode())
circle.size +=1
if isinstance(circle.cursor,EmptyCircleNode):
circle.cursor=newNode
elif isinstance(circle.cursor, CircleNode):
cur=circle.cursor
while not isinstance(cur.next,EmptyCircleNode):
cur = cur.next
cur.next = newNode
else:
raise TypeError("Bad list node")
def remove(circle):
circle.size -= 1
if circle.size <= 0:
circle.next= circle.cursor.next
else:
prev = circle.cursor
for i in range(circle.size-1):
prev = prev.next
prev.next = prev.next.next
def getCurrentElement(circle):
cur = circle.cursor
return cur
#this doesn't work....
