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#!/usr/bin/python
class List(list):
def dup(self):
def _dup(lst,ancestors):
for orig,copy in ancestors:
if lst == orig:
return copy
copy = lst[:]
_ancestors = ancestors+[(lst,copy)]
for i,x in enumerate(copy):
if isinstance(x, list):
copy[i] = _dup(x, _ancestors)
return copy
return List(_dup(self, []))
def mapped(self,proc):
return List(map(proc,self))
def map(self,proc):
self[:] = map(proc,self)
return self
def filtered(self,proc):
return List(filter(proc,self))
def filter(self,proc):
self[:] = filter(proc,self)
return self
def remove_if(self,proc):
return self.filter(lambda x: not proc(x))
def remove_all(self,val):
return self.remove_if(lambda x:x==val)
def compacted(self):
return self.filtered(lambda x:x!=None)
def compact(self):
return self.remove_every(None)
def uniqed(self):
dummy = List()
for x in self:
if x not in dummy:
dummy.append(x)
return dummy
def uniq(self):
self[:] = self.uniqed()
return self
def sorted(self,*args,**kw):
return List(sorted(self,*args,**kw))
def sort(self,*args,**kw):
self[:] = sorted(self,*args,**kw)
return self
def reversed(self):
return List(reversed(self))
def reverse(self):
self[:] = reversed(self)
return self
def flattened(self):
dummy = List()
for x in self:
if isinstance(x,List):
dummy.extend(x.flattened())
elif isinstance(x,list):
dummy.extend(List(x).flattened())
else:
dummy.append(x)
return dummy
def flatten(self):
self[:] = self.flattened()
return self
def concat(self,other):
self.extend(other)
return self
def sliced(self,pos=None,length=None,step=None):
return List(self[pos:length:step])
def slice(self,pos=None,length=None,step=None):
self[:] = self[pos:length:step]
return self
def unshift(self,val):
self.insert(0,val)
return self
def push(self,val):
self.append(val)
return self
def join(self,d):
return d.join(self)
def to_str(self):
return str(self)
def reduce(self,*args,**kw):
proc,arg = args[0],args[1:]
return reduce(proc,self,*arg,**kw)
def __getattr__(self,name):
if name == 'length':
return len(self)
else:
raise AttributeError, "'List' object has no attribute '%s'" % name
def choose(self,*args,**kw):
return List(choose(self,*args,**kw))
def permutation(self):
return List(permutation(self))
def combination(self):
return List(combination(self))
def choose(lst,n,allow_dup=True,distinguish_order=True):
if allow_dup and distinguish_order:
next = lambda lst, i: lst
if allow_dup and not distinguish_order:
next = lambda lst, i: lst[i:]
if not allow_dup and not distinguish_order:
next = lambda lst, i: lst[i+1:]
if not allow_dup and distinguish_order:
next = lambda lst, i: lst[:i]+lst[i+1:]
def _choose(lst,n):
if n == 0: return [[]] # from ruby
#if n == 1: return [[x] for x in lst]
ans = []
for i,x in enumerate(lst):
ans.extend([[x]+l for l in _choose(next(lst,i),n-1)])
return ans
return _choose(lst,n)
def permutation(lst,n=None):
if n == None: n = len(lst)
return choose(lst,n,allow_dup=False,distinguish_order=True)
def combination(lst,n=None):
if n == None: n = len(lst)
return choose(lst,n,allow_dup=False,distinguish_order=False)
def rotation(lst):
i,ans = 0, []
while i<len(lst):
ans.append(lst[i:]+lst[:i])
i += 1
return ans
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