summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_reprlib.py
blob: c233b1d67bea096c63c53435f08fface167fd64b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
"""
  Test cases for the repr module
  Nick Mathewson
"""

import imp
import sys
import os
import shutil
import importlib
import unittest

from test.support import run_unittest, create_empty_file, verbose
from reprlib import repr as r # Don't shadow builtin repr
from reprlib import Repr
from reprlib import recursive_repr


def nestedTuple(nesting):
    t = ()
    for i in range(nesting):
        t = (t,)
    return t

class ReprTests(unittest.TestCase):

    def test_string(self):
        eq = self.assertEqual
        eq(r("abc"), "'abc'")
        eq(r("abcdefghijklmnop"),"'abcdefghijklmnop'")

        s = "a"*30+"b"*30
        expected = repr(s)[:13] + "..." + repr(s)[-14:]
        eq(r(s), expected)

        eq(r("\"'"), repr("\"'"))
        s = "\""*30+"'"*100
        expected = repr(s)[:13] + "..." + repr(s)[-14:]
        eq(r(s), expected)

    def test_tuple(self):
        eq = self.assertEqual
        eq(r((1,)), "(1,)")

        t3 = (1, 2, 3)
        eq(r(t3), "(1, 2, 3)")

        r2 = Repr()
        r2.maxtuple = 2
        expected = repr(t3)[:-2] + "...)"
        eq(r2.repr(t3), expected)

    def test_container(self):
        from array import array
        from collections import deque

        eq = self.assertEqual
        # Tuples give up after 6 elements
        eq(r(()), "()")
        eq(r((1,)), "(1,)")
        eq(r((1, 2, 3)), "(1, 2, 3)")
        eq(r((1, 2, 3, 4, 5, 6)), "(1, 2, 3, 4, 5, 6)")
        eq(r((1, 2, 3, 4, 5, 6, 7)), "(1, 2, 3, 4, 5, 6, ...)")

        # Lists give up after 6 as well
        eq(r([]), "[]")
        eq(r([1]), "[1]")
        eq(r([1, 2, 3]), "[1, 2, 3]")
        eq(r([1, 2, 3, 4, 5, 6]), "[1, 2, 3, 4, 5, 6]")
        eq(r([1, 2, 3, 4, 5, 6, 7]), "[1, 2, 3, 4, 5, 6, ...]")

        # Sets give up after 6 as well
        eq(r(set([])), "set([])")
        eq(r(set([1])), "set([1])")
        eq(r(set([1, 2, 3])), "set([1, 2, 3])")
        eq(r(set([1, 2, 3, 4, 5, 6])), "set([1, 2, 3, 4, 5, 6])")
        eq(r(set([1, 2, 3, 4, 5, 6, 7])), "set([1, 2, 3, 4, 5, 6, ...])")

        # Frozensets give up after 6 as well
        eq(r(frozenset([])), "frozenset([])")
        eq(r(frozenset([1])), "frozenset([1])")
        eq(r(frozenset([1, 2, 3])), "frozenset([1, 2, 3])")
        eq(r(frozenset([1, 2, 3, 4, 5, 6])), "frozenset([1, 2, 3, 4, 5, 6])")
        eq(r(frozenset([1, 2, 3, 4, 5, 6, 7])), "frozenset([1, 2, 3, 4, 5, 6, ...])")

        # collections.deque after 6
        eq(r(deque([1, 2, 3, 4, 5, 6, 7])), "deque([1, 2, 3, 4, 5, 6, ...])")

        # Dictionaries give up after 4.
        eq(r({}), "{}")
        d = {'alice': 1, 'bob': 2, 'charles': 3, 'dave': 4}
        eq(r(d), "{'alice': 1, 'bob': 2, 'charles': 3, 'dave': 4}")
        d['arthur'] = 1
        eq(r(d), "{'alice': 1, 'arthur': 1, 'bob': 2, 'charles': 3, ...}")

        # array.array after 5.
        eq(r(array('i')), "array('i', [])")
        eq(r(array('i', [1])), "array('i', [1])")
        eq(r(array('i', [1, 2])), "array('i', [1, 2])")
        eq(r(array('i', [1, 2, 3])), "array('i', [1, 2, 3])")
        eq(r(array('i', [1, 2, 3, 4])), "array('i', [1, 2, 3, 4])")
        eq(r(array('i', [1, 2, 3, 4, 5])), "array('i', [1, 2, 3, 4, 5])")
        eq(r(array('i', [1, 2, 3, 4, 5, 6])),
                   "array('i', [1, 2, 3, 4, 5, ...])")

    def test_numbers(self):
        eq = self.assertEqual
        eq(r(123), repr(123))
        eq(r(123), repr(123))
        eq(r(1.0/3), repr(1.0/3))

        n = 10**100
        expected = repr(n)[:18] + "..." + repr(n)[-19:]
        eq(r(n), expected)

    def test_instance(self):
        eq = self.assertEqual
        i1 = ClassWithRepr("a")
        eq(r(i1), repr(i1))

        i2 = ClassWithRepr("x"*1000)
        expected = repr(i2)[:13] + "..." + repr(i2)[-14:]
        eq(r(i2), expected)

        i3 = ClassWithFailingRepr()
        eq(r(i3), ("<ClassWithFailingRepr instance at %x>"%id(i3)))

        s = r(ClassWithFailingRepr)
        self.assertTrue(s.startswith("<class "))
        self.assertTrue(s.endswith(">"))
        self.assertIn(s.find("..."), [12, 13])

    def test_lambda(self):
        r = repr(lambda x: x)
        self.assertTrue(r.startswith("<function ReprTests.test_lambda.<locals>.<lambda"), r)
        # XXX anonymous functions?  see func_repr

    def test_builtin_function(self):
        eq = self.assertEqual
        # Functions
        eq(repr(hash), '<built-in function hash>')
        # Methods
        self.assertTrue(repr(''.split).startswith(
            '<built-in method split of str object at 0x'))

    def test_range(self):
        eq = self.assertEqual
        eq(repr(range(1)), 'range(0, 1)')
        eq(repr(range(1, 2)), 'range(1, 2)')
        eq(repr(range(1, 4, 3)), 'range(1, 4, 3)')

    def test_nesting(self):
        eq = self.assertEqual
        # everything is meant to give up after 6 levels.
        eq(r([[[[[[[]]]]]]]), "[[[[[[[]]]]]]]")
        eq(r([[[[[[[[]]]]]]]]), "[[[[[[[...]]]]]]]")

        eq(r(nestedTuple(6)), "(((((((),),),),),),)")
        eq(r(nestedTuple(7)), "(((((((...),),),),),),)")

        eq(r({ nestedTuple(5) : nestedTuple(5) }),
           "{((((((),),),),),): ((((((),),),),),)}")
        eq(r({ nestedTuple(6) : nestedTuple(6) }),
           "{((((((...),),),),),): ((((((...),),),),),)}")

        eq(r([[[[[[{}]]]]]]), "[[[[[[{}]]]]]]")
        eq(r([[[[[[[{}]]]]]]]), "[[[[[[[...]]]]]]]")

    def test_cell(self):
        def get_cell():
            x = 42
            def inner():
                return x
            return inner
        x = get_cell().__closure__[0]
        self.assertRegex(repr(x), r'<cell at 0x[0-9A-Fa-f]+: '
                                  r'int object at 0x[0-9A-Fa-f]+>')
        self.assertRegex(r(x), r'<cell at 0x.*\.\.\..*>')

    def test_descriptors(self):
        eq = self.assertEqual
        # method descriptors
        eq(repr(dict.items), "<method 'items' of 'dict' objects>")
        # XXX member descriptors
        # XXX attribute descriptors
        # XXX slot descriptors
        # static and class methods
        class C:
            def foo(cls): pass
        x = staticmethod(C.foo)
        self.assertTrue(repr(x).startswith('<staticmethod object at 0x'))
        x = classmethod(C.foo)
        self.assertTrue(repr(x).startswith('<classmethod object at 0x'))

    def test_unsortable(self):
        # Repr.repr() used to call sorted() on sets, frozensets and dicts
        # without taking into account that not all objects are comparable
        x = set([1j, 2j, 3j])
        y = frozenset(x)
        z = {1j: 1, 2j: 2}
        r(x)
        r(y)
        r(z)

def write_file(path, text):
    with open(path, 'w', encoding='ASCII') as fp:
        fp.write(text)

class LongReprTest(unittest.TestCase):
    longname = 'areallylongpackageandmodulenametotestreprtruncation'

    def setUp(self):
        self.pkgname = os.path.join(self.longname)
        self.subpkgname = os.path.join(self.longname, self.longname)
        # Make the package and subpackage
        shutil.rmtree(self.pkgname, ignore_errors=True)
        os.mkdir(self.pkgname)
        create_empty_file(os.path.join(self.pkgname, '__init__.py'))
        shutil.rmtree(self.subpkgname, ignore_errors=True)
        os.mkdir(self.subpkgname)
        create_empty_file(os.path.join(self.subpkgname, '__init__.py'))
        # Remember where we are
        self.here = os.getcwd()
        sys.path.insert(0, self.here)
        # When regrtest is run with its -j option, this command alone is not
        # enough.
        importlib.invalidate_caches()

    def tearDown(self):
        actions = []
        for dirpath, dirnames, filenames in os.walk(self.pkgname):
            for name in dirnames + filenames:
                actions.append(os.path.join(dirpath, name))
        actions.append(self.pkgname)
        actions.sort()
        actions.reverse()
        for p in actions:
            if os.path.isdir(p):
                os.rmdir(p)
            else:
                os.remove(p)
        del sys.path[0]

    def _check_path_limitations(self, module_name):
        # base directory
        source_path_len = len(self.here)
        # a path separator + `longname` (twice)
        source_path_len += 2 * (len(self.longname) + 1)
        # a path separator + `module_name` + ".py"
        source_path_len += len(module_name) + 1 + len(".py")
        cached_path_len = source_path_len + len(imp.cache_from_source("x.py")) - len("x.py")
        if os.name == 'nt' and cached_path_len >= 258:
            # Under Windows, the max path len is 260 including C's terminating
            # NUL character.
            # (see http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx#maxpath)
            self.skipTest("test paths too long (%d characters) for Windows' 260 character limit"
                          % cached_path_len)
        elif os.name == 'nt' and verbose:
            print("cached_path_len =", cached_path_len)

    def test_module(self):
        self._check_path_limitations(self.pkgname)
        create_empty_file(os.path.join(self.subpkgname, self.pkgname + '.py'))
        importlib.invalidate_caches()
        from areallylongpackageandmodulenametotestreprtruncation.areallylongpackageandmodulenametotestreprtruncation import areallylongpackageandmodulenametotestreprtruncation
        module = areallylongpackageandmodulenametotestreprtruncation
        self.assertEqual(repr(module), "<module %r from %r>" % (module.__name__, module.__file__))
        self.assertEqual(repr(sys), "<module 'sys' (built-in)>")

    def test_type(self):
        self._check_path_limitations('foo')
        eq = self.assertEqual
        write_file(os.path.join(self.subpkgname, 'foo.py'), '''\
class foo(object):
    pass
''')
        importlib.invalidate_caches()
        from areallylongpackageandmodulenametotestreprtruncation.areallylongpackageandmodulenametotestreprtruncation import foo
        eq(repr(foo.foo),
               "<class '%s.foo'>" % foo.__name__)

    @unittest.skip('need a suitable object')
    def test_object(self):
        # XXX Test the repr of a type with a really long tp_name but with no
        # tp_repr.  WIBNI we had ::Inline? :)
        pass

    def test_class(self):
        self._check_path_limitations('bar')
        write_file(os.path.join(self.subpkgname, 'bar.py'), '''\
class bar:
    pass
''')
        importlib.invalidate_caches()
        from areallylongpackageandmodulenametotestreprtruncation.areallylongpackageandmodulenametotestreprtruncation import bar
        # Module name may be prefixed with "test.", depending on how run.
        self.assertEqual(repr(bar.bar), "<class '%s.bar'>" % bar.__name__)

    def test_instance(self):
        self._check_path_limitations('baz')
        write_file(os.path.join(self.subpkgname, 'baz.py'), '''\
class baz:
    pass
''')
        importlib.invalidate_caches()
        from areallylongpackageandmodulenametotestreprtruncation.areallylongpackageandmodulenametotestreprtruncation import baz
        ibaz = baz.baz()
        self.assertTrue(repr(ibaz).startswith(
            "<%s.baz object at 0x" % baz.__name__))

    def test_method(self):
        self._check_path_limitations('qux')
        eq = self.assertEqual
        write_file(os.path.join(self.subpkgname, 'qux.py'), '''\
class aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa:
    def amethod(self): pass
''')
        importlib.invalidate_caches()
        from areallylongpackageandmodulenametotestreprtruncation.areallylongpackageandmodulenametotestreprtruncation import qux
        # Unbound methods first
        r = repr(qux.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.amethod)
        self.assertTrue(r.startswith('<function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.amethod'), r)
        # Bound method next
        iqux = qux.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa()
        r = repr(iqux.amethod)
        self.assertTrue(r.startswith(
            '<bound method aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.amethod of <%s.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa object at 0x' \
            % (qux.__name__,) ), r)

    @unittest.skip('needs a built-in function with a really long name')
    def test_builtin_function(self):
        # XXX test built-in functions and methods with really long names
        pass

class ClassWithRepr:
    def __init__(self, s):
        self.s = s
    def __repr__(self):
        return "ClassWithRepr(%r)" % self.s


class ClassWithFailingRepr:
    def __repr__(self):
        raise Exception("This should be caught by Repr.repr_instance")

class MyContainer:
    'Helper class for TestRecursiveRepr'
    def __init__(self, values):
        self.values = list(values)
    def append(self, value):
        self.values.append(value)
    @recursive_repr()
    def __repr__(self):
        return '<' + ', '.join(map(str, self.values)) + '>'

class MyContainer2(MyContainer):
    @recursive_repr('+++')
    def __repr__(self):
        return '<' + ', '.join(map(str, self.values)) + '>'

class TestRecursiveRepr(unittest.TestCase):
    def test_recursive_repr(self):
        m = MyContainer(list('abcde'))
        m.append(m)
        m.append('x')
        m.append(m)
        self.assertEqual(repr(m), '<a, b, c, d, e, ..., x, ...>')
        m = MyContainer2(list('abcde'))
        m.append(m)
        m.append('x')
        m.append(m)
        self.assertEqual(repr(m), '<a, b, c, d, e, +++, x, +++>')

def test_main():
    run_unittest(ReprTests)
    run_unittest(LongReprTest)
    run_unittest(TestRecursiveRepr)


if __name__ == "__main__":
    test_main()