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from typ import Integer
class cons:
def __init__(self, a, d):
self.a = a
self.d = d
def car(self): return self.a
def cdr(self): return self.d
def caar(self): return
def cdar(self): return self.a.cdr()
def cadr(self): return
def cddr(self): return self.d.cdr()
def caaar(self): return self.a.caar()
def cdaar(self): return self.a.cdar()
def cadar(self): return self.a.cadr()
def cddar(self): return self.a.cddr()
def caadr(self): return self.d.caar()
def cdadr(self): return self.d.cdar()
def caddr(self): return self.d.cadr()
def cdddr(self): return self.d.cddr()
def caaaar(self): return self.a.caaar()
def cdaaar(self): return self.a.cdaar()
def cadaar(self): return self.a.cadar()
def cddaar(self): return self.a.cddar()
def caadar(self): return self.a.caadr()
def cdadar(self): return self.a.cdadr()
def caddar(self): return self.a.caddr()
def cdddar(self): return self.a.cdddr()
def caaadr(self): return self.d.caaar()
def cdaadr(self): return self.d.cdaar()
def cadadr(self): return self.d.cadar()
def cddadr(self): return self.d.cddar()
def caaddr(self): return self.d.caadr()
def cdaddr(self): return self.d.cdadr()
def cadddr(self): return self.d.caddr()
def cddddr(self): return self.d.cdddr()
def set_car_ (self, x): self.a = x
def set_cdr_ (self, x): self.d = x
def nullp(self): return False
def append(self, lst):
return cons(, self.cdr().append(lst))
def reverse(self, r=None):
if r is None: r = nil
return self.cdr().reverse(cons(, r))
def map(self, f):
return cons(f(, self.cdr().map(f))
def __len__(self):
cdr_len = 0
cdr_len = len(self.cdr())
return 1 + cdr_len
def len(self):
return Integer(len(self))
def __iter__(self):
while True:
self = self.cdr()
if self.nullp(): break
def __repr__(self):
return '(%s)' % self.bare_repr('')
def bare_repr(self, sp):
if isinstance(self.d, cons):
return '%s%r%s' % (sp, self.a, self.d.bare_repr(' '))
return '%s%r . %r' % (sp, self.a, self.d)
def __eq__(a, b):
if b is nil: return False
if type(b) != type(a): return False
return == and a.cdr() == b.cdr()
def __hash__(self):
return id(self)
setattr(cons, 'set-car!', cons.set_car_)
setattr(cons, 'set-cdr!', cons.set_cdr_)
def pairp(x):
return isinstance(x, cons) and not isinstance(x, nilcons)
def list(*vals):
if not vals: return nil
return cons(vals[0], list(*vals[1:]))
class nilcons(cons):
new = None
def __new__(cls, ign1, ign2):
it = cls.__dict__.get('__it__')
if it is not None: return it
cls.__it__ = it = object.__new__(cls)
return it
def __init__(self, ign1, ign2):
def nullp(self): return True
def car(self): raise 'nil has no car'
def cdr(self): raise 'nil has no cdr'
def append(self, lst):
return lst
def reverse(self, r=None):
if r is None: r = nil
return r
def map(self, f):
return self
def __len__(self):
return 0
def __iter__(self):
return ().__iter__()
def __repr__(self):
return '()'
def bare_repr(self, ign):
return ''
def __eq__(a, b):
return a is nil and b is nil
nil = nilcons(None, None)
# vim: et ts=4