Lib/ctypes/test/test_slicing.py

   1 import unittest
   2 from ctypes import *
   3
   4 import _ctypes_test
   5
   6 class SlicesTestCase(unittest.TestCase):
   7     def test_getslice_cint(self):
   8         a = (c_int * 100)(*xrange(1100, 1200))
   9         b = range(1100, 1200)
  10         self.assertEqual(a[0:2], b[0:2])
  11         self.assertEqual(a[0:2:], b[0:2:])
  12         self.assertEqual(len(a), len(b))
  13         self.assertEqual(a[5:7], b[5:7])
  14         self.assertEqual(a[5:7:], b[5:7:])
  15         self.assertEqual(a[-1], b[-1])
  16         self.assertEqual(a[:], b[:])
  17         self.assertEqual(a[::], b[::])
  18         self.assertEqual(a[10::-1], b[10::-1])
  19         self.assertEqual(a[30:20:-1], b[30:20:-1])
  20         self.assertEqual(a[:12:6], b[:12:6])
  21         self.assertEqual(a[2:6:4], b[2:6:4])
  22
  23         a[0:5] = range(5, 10)
  24         self.assertEqual(a[0:5], range(5, 10))
  25         self.assertEqual(a[0:5:], range(5, 10))
  26         self.assertEqual(a[4::-1], range(9, 4, -1))
  27
  28     def test_setslice_cint(self):
  29         a = (c_int * 100)(*xrange(1100, 1200))
  30         b = range(1100, 1200)
  31
  32         a[32:47] = range(32, 47)
  33         self.assertEqual(a[32:47], range(32, 47))
  34         a[32:47] = range(132, 147)
  35         self.assertEqual(a[32:47:], range(132, 147))
  36         a[46:31:-1] = range(232, 247)
  37         self.assertEqual(a[32:47:1], range(246, 231, -1))
  38
  39         a[32:47] = range(1132, 1147)
  40         self.assertEqual(a[:], b)
  41         a[32:47:7] = range(3)
  42         b[32:47:7] = range(3)
  43         self.assertEqual(a[:], b)
  44         a[33::-3] = range(12)
  45         b[33::-3] = range(12)
  46         self.assertEqual(a[:], b)
  47
  48         from operator import setslice, setitem
  49
  50         # TypeError: int expected instead of str instance
  51         self.assertRaises(TypeError, setslice, a, 0, 5, "abcde")
  52         self.assertRaises(TypeError, setitem, a, slice(0, 5), "abcde")
  53         # TypeError: int expected instead of str instance
  54         self.assertRaises(TypeError, setslice, a, 0, 5, ["a", "b", "c", "d", "e"])
  55         self.assertRaises(TypeError, setitem, a, slice(0, 5),
  56                           ["a", "b", "c", "d", "e"])
  57         # TypeError: int expected instead of float instance
  58         self.assertRaises(TypeError, setslice, a, 0, 5, [1, 2, 3, 4, 3.14])
  59         self.assertRaises(TypeError, setitem, a, slice(0, 5),
  60                           [1, 2, 3, 4, 3.14])
  61         # ValueError: Can only assign sequence of same size
  62         self.assertRaises(ValueError, setslice, a, 0, 5, range(32))
  63         self.assertRaises(ValueError, setitem, a, slice(0, 5), range(32))
  64
  65     def test_char_ptr(self):
  66         s = "abcdefghijklmnopqrstuvwxyz"
  67
  68         dll = CDLL(_ctypes_test.__file__)
  69         dll.my_strdup.restype = POINTER(c_char)
  70         dll.my_free.restype = None
  71         res = dll.my_strdup(s)
  72         self.assertEqual(res[:len(s)], s)
  73         self.assertEqual(res[:3], s[:3])
  74         self.assertEqual(res[:len(s):], s)
  75         self.assertEqual(res[len(s)-1:-1:-1], s[::-1])
  76         self.assertEqual(res[len(s)-1:5:-7], s[:5:-7])
  77         self.assertEqual(res[0:-1:-1], s[0::-1])
  78
  79         import operator
  80         self.assertRaises(ValueError, operator.getitem,
  81                           res, slice(None, None, None))
  82         self.assertRaises(ValueError, operator.getitem,
  83                           res, slice(0, None, None))
  84         self.assertRaises(ValueError, operator.getitem,
  85                           res, slice(None, 5, -1))
  86         self.assertRaises(ValueError, operator.getitem,
  87                           res, slice(-5, None, None))
  88
  89         self.assertRaises(TypeError, operator.setslice,
  90                           res, 0, 5, u"abcde")
  91         self.assertRaises(TypeError, operator.setitem,
  92                           res, slice(0, 5), u"abcde")
  93         dll.my_free(res)
  94
  95         dll.my_strdup.restype = POINTER(c_byte)
  96         res = dll.my_strdup(s)
  97         self.assertEqual(res[:len(s)], range(ord("a"), ord("z")+1))
  98         self.assertEqual(res[:len(s):], range(ord("a"), ord("z")+1))
  99         dll.my_free(res)
 100
 101     def test_char_ptr_with_free(self):
 102         dll = CDLL(_ctypes_test.__file__)
 103         s = "abcdefghijklmnopqrstuvwxyz"
 104
 105         class allocated_c_char_p(c_char_p):
 106             pass
 107
 108         dll.my_free.restype = None
 109         def errcheck(result, func, args):
 110             retval = result.value
 111             dll.my_free(result)
 112             return retval
 113
 114         dll.my_strdup.restype = allocated_c_char_p
 115         dll.my_strdup.errcheck = errcheck
 116         try:
 117             res = dll.my_strdup(s)
 118             self.assertEqual(res, s)
 119         finally:
 120             del dll.my_strdup.errcheck
 121
 122
 123     def test_char_array(self):
 124         s = "abcdefghijklmnopqrstuvwxyz\0"
 125
 126         p = (c_char * 27)(*s)
 127         self.assertEqual(p[:], s)
 128         self.assertEqual(p[::], s)
 129         self.assertEqual(p[::-1], s[::-1])
 130         self.assertEqual(p[5::-2], s[5::-2])
 131         self.assertEqual(p[2:5:-3], s[2:5:-3])
 132
 133
 134     try:
 135         c_wchar
 136     except NameError:
 137         pass
 138     else:
 139         def test_wchar_ptr(self):
 140             s = u"abcdefghijklmnopqrstuvwxyz\0"
 141
 142             dll = CDLL(_ctypes_test.__file__)
 143             dll.my_wcsdup.restype = POINTER(c_wchar)
 144             dll.my_wcsdup.argtypes = POINTER(c_wchar),
 145             dll.my_free.restype = None
 146             res = dll.my_wcsdup(s)
 147             self.assertEqual(res[:len(s)], s)
 148             self.assertEqual(res[:len(s):], s)
 149             self.assertEqual(res[len(s)-1:-1:-1], s[::-1])
 150             self.assertEqual(res[len(s)-1:5:-7], s[:5:-7])
 151
 152             import operator
 153             self.assertRaises(TypeError, operator.setslice,
 154                               res, 0, 5, u"abcde")
 155             self.assertRaises(TypeError, operator.setitem,
 156                               res, slice(0, 5), u"abcde")
 157             dll.my_free(res)
 158
 159             if sizeof(c_wchar) == sizeof(c_short):
 160                 dll.my_wcsdup.restype = POINTER(c_short)
 161             elif sizeof(c_wchar) == sizeof(c_int):
 162                 dll.my_wcsdup.restype = POINTER(c_int)
 163             elif sizeof(c_wchar) == sizeof(c_long):
 164                 dll.my_wcsdup.restype = POINTER(c_long)
 165             else:
 166                 return
 167             res = dll.my_wcsdup(s)
 168             tmpl = range(ord("a"), ord("z")+1)
 169             self.assertEqual(res[:len(s)-1], tmpl)
 170             self.assertEqual(res[:len(s)-1:], tmpl)
 171             self.assertEqual(res[len(s)-2:-1:-1], tmpl[::-1])
 172             self.assertEqual(res[len(s)-2:5:-7], tmpl[:5:-7])
 173             dll.my_free(res)
 174
 175 ################################################################
 176
 177 if __name__ == "__main__":
 178     unittest.main()