sqlmap/lib/utils/xrange.py
2023-01-02 23:24:59 +01:00

105 lines
2.9 KiB
Python

#!/usr/bin/env python
"""
Copyright (c) 2006-2023 sqlmap developers (https://sqlmap.org/)
See the file 'LICENSE' for copying permission
"""
import numbers
class xrange(object):
"""
Advanced (re)implementation of xrange (supports slice/copy/etc.)
Reference: http://code.activestate.com/recipes/521885-a-pythonic-implementation-of-xrange/
>>> list(xrange(1, 9)) == list(range(1, 9))
True
>>> list(xrange(8, 0, -16)) == list(range(8, 0, -16))
True
>>> list(xrange(0, 8, 16)) == list(range(0, 8, 16))
True
>>> list(xrange(0, 4, 5)) == list(range(0, 4, 5))
True
>>> list(xrange(4, 0, 3)) == list(range(4, 0, 3))
True
>>> list(xrange(0, -3)) == list(range(0, -3))
True
>>> list(xrange(0, 7, 2)) == list(range(0, 7, 2))
True
>>> foobar = xrange(1, 10)
>>> 7 in foobar
True
>>> 11 in foobar
False
>>> foobar[0]
1
"""
__slots__ = ['_slice']
def __init__(self, *args):
if args and isinstance(args[0], type(self)):
self._slice = slice(args[0].start, args[0].stop, args[0].step)
else:
self._slice = slice(*args)
if self._slice.stop is None:
raise TypeError("xrange stop must not be None")
@property
def start(self):
if self._slice.start is not None:
return self._slice.start
return 0
@property
def stop(self):
return self._slice.stop
@property
def step(self):
if self._slice.step is not None:
return self._slice.step
return 1
def __hash__(self):
return hash(self._slice)
def __repr__(self):
return '%s(%r, %r, %r)' % (type(self).__name__, self.start, self.stop, self.step)
def __len__(self):
return self._len()
def _len(self):
return max(0, 1 + int((self.stop - 1 - self.start) // self.step))
def __contains__(self, value):
return (self.start <= value < self.stop) and (value - self.start) % self.step == 0
def __getitem__(self, index):
if isinstance(index, slice):
start, stop, step = index.indices(self._len())
return xrange(self._index(start),
self._index(stop), step * self.step)
elif isinstance(index, numbers.Integral):
if index < 0:
fixed_index = index + self._len()
else:
fixed_index = index
if not 0 <= fixed_index < self._len():
raise IndexError("Index %d out of %r" % (index, self))
return self._index(fixed_index)
else:
raise TypeError("xrange indices must be slices or integers")
def _index(self, i):
return self.start + self.step * i
def index(self, i):
if self.start <= i < self.stop:
return i - self.start
else:
raise ValueError("%d is not in list" % i)