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singlelist.py
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90 lines (68 loc) · 2.15 KB
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"""Klasa reprezentująca węzeł listy jednokierunkowej."""
class Node:
def __init__( self, data=None, next=None ):
self.data = data
self.next = next
def __str__(self):
return str(self.data)
"""Klasa reprezentująca całą listę jednokierunkową."""
class SingleList:
def __init__(self):
self.length = 0
self.head = None
self.tail = None
def is_empty(self):
return self.head is None
def count(self):
return self.length
def insert_head( self, node ):
if self.head:
node.next = self.head
self.head = node
else:
self.head = self.tail = node
self.length = self.length+1
def insert_tail( self, node ):
if self.head:
self.tail.next = node
self.tail = node
else:
self.head = self.tail = node
self.length = self.length+1
def remove_head(self):
if self.is_empty():
raise ValueError("The list is empty!")
node = self.head
if self.head == self.tail:
self.head = self.tail = None
else:
self.head = self.head.next
node.next = None
self.length = self.length-1
return node
# Zwraca cały węzeł, skraca listę.
# Dla pustej listy rzuca wyjątek ValueError.
def remove_tail(self):
if self.is_empty():
raise ValueError("The list is empty!")
node = self.tail
if self.head == self.tail:
self.head = self.tail = None
else:
current = self.head
while current.next != self.tail:
current = current.next
current.next = None
self.tail = current
self.length -= 1
return node
# Węzły z listy other są przepinane do listy self na jej koniec.
# Po zakończeniu operacji lista other ma być pusta.
def join( self, other ):
self.tail.next = other.head
self.tail = other.tail
self.length = self.length+other.length
other.clear()
def clear(self):
self.head = self.tail = None
self.length = 0