pypy /lib-python/2.7/test/test_parser.py

Language Python Lines 597
MD5 Hash 6cf76ea62b411135f65d508b8c60cdf2 Estimated Cost $13,350 (why?)
Repository https://bitbucket.org/yrttyr/pypy View Raw File View Project SPDX
  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
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
import parser
import unittest
import sys
from test import test_support

#
#  First, we test that we can generate trees from valid source fragments,
#  and that these valid trees are indeed allowed by the tree-loading side
#  of the parser module.
#

class RoundtripLegalSyntaxTestCase(unittest.TestCase):

    def roundtrip(self, f, s):
        st1 = f(s)
        t = st1.totuple()
        try:
            st2 = parser.sequence2st(t)
        except parser.ParserError, why:
            self.fail("could not roundtrip %r: %s" % (s, why))

        self.assertEqual(t, st2.totuple(),
                         "could not re-generate syntax tree")

    def check_expr(self, s):
        self.roundtrip(parser.expr, s)

    def test_flags_passed(self):
        # The unicode literals flags has to be passed from the paser to AST
        # generation.
        suite = parser.suite("from __future__ import unicode_literals; x = ''")
        code = suite.compile()
        scope = {}
        exec code in scope
        self.assertIsInstance(scope["x"], unicode)

    def check_suite(self, s):
        self.roundtrip(parser.suite, s)

    def test_yield_statement(self):
        self.check_suite("def f(): yield 1")
        self.check_suite("def f(): yield")
        self.check_suite("def f(): x += yield")
        self.check_suite("def f(): x = yield 1")
        self.check_suite("def f(): x = y = yield 1")
        self.check_suite("def f(): x = yield")
        self.check_suite("def f(): x = y = yield")
        self.check_suite("def f(): 1 + (yield)*2")
        self.check_suite("def f(): (yield 1)*2")
        self.check_suite("def f(): return; yield 1")
        self.check_suite("def f(): yield 1; return")
        self.check_suite("def f():\n"
                         "    for x in range(30):\n"
                         "        yield x\n")
        self.check_suite("def f():\n"
                         "    if (yield):\n"
                         "        yield x\n")

    def test_expressions(self):
        self.check_expr("foo(1)")
        self.check_expr("{1:1}")
        self.check_expr("{1:1, 2:2, 3:3}")
        self.check_expr("{1:1, 2:2, 3:3,}")
        self.check_expr("{1}")
        self.check_expr("{1, 2, 3}")
        self.check_expr("{1, 2, 3,}")
        self.check_expr("[]")
        self.check_expr("[1]")
        self.check_expr("[1, 2, 3]")
        self.check_expr("[1, 2, 3,]")
        self.check_expr("()")
        self.check_expr("(1,)")
        self.check_expr("(1, 2, 3)")
        self.check_expr("(1, 2, 3,)")
        self.check_expr("[x**3 for x in range(20)]")
        self.check_expr("[x**3 for x in range(20) if x % 3]")
        self.check_expr("[x**3 for x in range(20) if x % 2 if x % 3]")
        self.check_expr("[x+y for x in range(30) for y in range(20) if x % 2 if y % 3]")
        #self.check_expr("[x for x in lambda: True, lambda: False if x()]")
        self.check_expr("list(x**3 for x in range(20))")
        self.check_expr("list(x**3 for x in range(20) if x % 3)")
        self.check_expr("list(x**3 for x in range(20) if x % 2 if x % 3)")
        self.check_expr("list(x+y for x in range(30) for y in range(20) if x % 2 if y % 3)")
        self.check_expr("{x**3 for x in range(30)}")
        self.check_expr("{x**3 for x in range(30) if x % 3}")
        self.check_expr("{x**3 for x in range(30) if x % 2 if x % 3}")
        self.check_expr("{x+y for x in range(30) for y in range(20) if x % 2 if y % 3}")
        self.check_expr("{x**3: y**2 for x, y in zip(range(30), range(30))}")
        self.check_expr("{x**3: y**2 for x, y in zip(range(30), range(30)) if x % 3}")
        self.check_expr("{x**3: y**2 for x, y in zip(range(30), range(30)) if x % 3 if y % 3}")
        self.check_expr("{x:y for x in range(30) for y in range(20) if x % 2 if y % 3}")
        self.check_expr("foo(*args)")
        self.check_expr("foo(*args, **kw)")
        self.check_expr("foo(**kw)")
        self.check_expr("foo(key=value)")
        self.check_expr("foo(key=value, *args)")
        self.check_expr("foo(key=value, *args, **kw)")
        self.check_expr("foo(key=value, **kw)")
        self.check_expr("foo(a, b, c, *args)")
        self.check_expr("foo(a, b, c, *args, **kw)")
        self.check_expr("foo(a, b, c, **kw)")
        self.check_expr("foo(a, *args, keyword=23)")
        self.check_expr("foo + bar")
        self.check_expr("foo - bar")
        self.check_expr("foo * bar")
        self.check_expr("foo / bar")
        self.check_expr("foo // bar")
        self.check_expr("lambda: 0")
        self.check_expr("lambda x: 0")
        self.check_expr("lambda *y: 0")
        self.check_expr("lambda *y, **z: 0")
        self.check_expr("lambda **z: 0")
        self.check_expr("lambda x, y: 0")
        self.check_expr("lambda foo=bar: 0")
        self.check_expr("lambda foo=bar, spaz=nifty+spit: 0")
        self.check_expr("lambda foo=bar, **z: 0")
        self.check_expr("lambda foo=bar, blaz=blat+2, **z: 0")
        self.check_expr("lambda foo=bar, blaz=blat+2, *y, **z: 0")
        self.check_expr("lambda x, *y, **z: 0")
        self.check_expr("lambda x: 5 if x else 2")
        self.check_expr("(x for x in range(10))")
        self.check_expr("foo(x for x in range(10))")

    def test_print(self):
        self.check_suite("print")
        self.check_suite("print 1")
        self.check_suite("print 1,")
        self.check_suite("print >>fp")
        self.check_suite("print >>fp, 1")
        self.check_suite("print >>fp, 1,")

    def test_simple_expression(self):
        # expr_stmt
        self.check_suite("a")

    def test_simple_assignments(self):
        self.check_suite("a = b")
        self.check_suite("a = b = c = d = e")

    def test_simple_augmented_assignments(self):
        self.check_suite("a += b")
        self.check_suite("a -= b")
        self.check_suite("a *= b")
        self.check_suite("a /= b")
        self.check_suite("a //= b")
        self.check_suite("a %= b")
        self.check_suite("a &= b")
        self.check_suite("a |= b")
        self.check_suite("a ^= b")
        self.check_suite("a <<= b")
        self.check_suite("a >>= b")
        self.check_suite("a **= b")

    def test_function_defs(self):
        self.check_suite("def f(): pass")
        self.check_suite("def f(*args): pass")
        self.check_suite("def f(*args, **kw): pass")
        self.check_suite("def f(**kw): pass")
        self.check_suite("def f(foo=bar): pass")
        self.check_suite("def f(foo=bar, *args): pass")
        self.check_suite("def f(foo=bar, *args, **kw): pass")
        self.check_suite("def f(foo=bar, **kw): pass")

        self.check_suite("def f(a, b): pass")
        self.check_suite("def f(a, b, *args): pass")
        self.check_suite("def f(a, b, *args, **kw): pass")
        self.check_suite("def f(a, b, **kw): pass")
        self.check_suite("def f(a, b, foo=bar): pass")
        self.check_suite("def f(a, b, foo=bar, *args): pass")
        self.check_suite("def f(a, b, foo=bar, *args, **kw): pass")
        self.check_suite("def f(a, b, foo=bar, **kw): pass")

        self.check_suite("@staticmethod\n"
                         "def f(): pass")
        self.check_suite("@staticmethod\n"
                         "@funcattrs(x, y)\n"
                         "def f(): pass")
        self.check_suite("@funcattrs()\n"
                         "def f(): pass")

    def test_class_defs(self):
        self.check_suite("class foo():pass")
        self.check_suite("@class_decorator\n"
                         "class foo():pass")
        self.check_suite("@class_decorator(arg)\n"
                         "class foo():pass")
        self.check_suite("@decorator1\n"
                         "@decorator2\n"
                         "class foo():pass")


    def test_import_from_statement(self):
        self.check_suite("from sys.path import *")
        self.check_suite("from sys.path import dirname")
        self.check_suite("from sys.path import (dirname)")
        self.check_suite("from sys.path import (dirname,)")
        self.check_suite("from sys.path import dirname as my_dirname")
        self.check_suite("from sys.path import (dirname as my_dirname)")
        self.check_suite("from sys.path import (dirname as my_dirname,)")
        self.check_suite("from sys.path import dirname, basename")
        self.check_suite("from sys.path import (dirname, basename)")
        self.check_suite("from sys.path import (dirname, basename,)")
        self.check_suite(
            "from sys.path import dirname as my_dirname, basename")
        self.check_suite(
            "from sys.path import (dirname as my_dirname, basename)")
        self.check_suite(
            "from sys.path import (dirname as my_dirname, basename,)")
        self.check_suite(
            "from sys.path import dirname, basename as my_basename")
        self.check_suite(
            "from sys.path import (dirname, basename as my_basename)")
        self.check_suite(
            "from sys.path import (dirname, basename as my_basename,)")
        self.check_suite("from .bogus import x")

    def test_basic_import_statement(self):
        self.check_suite("import sys")
        self.check_suite("import sys as system")
        self.check_suite("import sys, math")
        self.check_suite("import sys as system, math")
        self.check_suite("import sys, math as my_math")

    def test_relative_imports(self):
        self.check_suite("from . import name")
        self.check_suite("from .. import name")
        self.check_suite("from .pkg import name")
        self.check_suite("from ..pkg import name")

    def test_pep263(self):
        self.check_suite("# -*- coding: iso-8859-1 -*-\n"
                         "pass\n")

    def test_assert(self):
        self.check_suite("assert alo < ahi and blo < bhi\n")

    def test_with(self):
        self.check_suite("with open('x'): pass\n")
        self.check_suite("with open('x') as f: pass\n")
        self.check_suite("with open('x') as f, open('y') as g: pass\n")

    def test_try_stmt(self):
        self.check_suite("try: pass\nexcept: pass\n")
        self.check_suite("try: pass\nfinally: pass\n")
        self.check_suite("try: pass\nexcept A: pass\nfinally: pass\n")
        self.check_suite("try: pass\nexcept A: pass\nexcept: pass\n"
                         "finally: pass\n")
        self.check_suite("try: pass\nexcept: pass\nelse: pass\n")
        self.check_suite("try: pass\nexcept: pass\nelse: pass\n"
                         "finally: pass\n")

    def test_except_clause(self):
        self.check_suite("try: pass\nexcept: pass\n")
        self.check_suite("try: pass\nexcept A: pass\n")
        self.check_suite("try: pass\nexcept A, e: pass\n")
        self.check_suite("try: pass\nexcept A as e: pass\n")

    def test_position(self):
        # An absolutely minimal test of position information.  Better
        # tests would be a big project.
        code = "def f(x):\n    return x + 1"
        st1 = parser.suite(code)
        st2 = st1.totuple(line_info=1, col_info=1)

        def walk(tree):
            node_type = tree[0]
            next = tree[1]
            if isinstance(next, tuple):
                for elt in tree[1:]:
                    for x in walk(elt):
                        yield x
            else:
                yield tree

        terminals = list(walk(st2))
        self.assertEqual([
            (1, 'def', 1, 0),
            (1, 'f', 1, 4),
            (7, '(', 1, 5),
            (1, 'x', 1, 6),
            (8, ')', 1, 7),
            (11, ':', 1, 8),
            (4, '', 1, 9),
            (5, '', 2, -1),
            (1, 'return', 2, 4),
            (1, 'x', 2, 11),
            (14, '+', 2, 13),
            (2, '1', 2, 15),
            (4, '', 2, 16),
            (6, '', 2, -1),
            (4, '', 2, -1),
            (0, '', 2, -1)],
                         terminals)


#
#  Second, we take *invalid* trees and make sure we get ParserError
#  rejections for them.
#

class IllegalSyntaxTestCase(unittest.TestCase):

    def check_bad_tree(self, tree, label):
        try:
            parser.sequence2st(tree)
        except parser.ParserError:
            pass
        else:
            self.fail("did not detect invalid tree for %r" % label)

    def test_junk(self):
        # not even remotely valid:
        self.check_bad_tree((1, 2, 3), "<junk>")

    def test_illegal_yield_1(self):
        # Illegal yield statement: def f(): return 1; yield 1
        tree = \
        (257,
         (264,
          (285,
           (259,
            (1, 'def'),
            (1, 'f'),
            (260, (7, '('), (8, ')')),
            (11, ':'),
            (291,
             (4, ''),
             (5, ''),
             (264,
              (265,
               (266,
                (272,
                 (275,
                  (1, 'return'),
                  (313,
                   (292,
                    (293,
                     (294,
                      (295,
                       (297,
                        (298,
                         (299,
                          (300,
                           (301,
                            (302, (303, (304, (305, (2, '1')))))))))))))))))),
               (264,
                (265,
                 (266,
                  (272,
                   (276,
                    (1, 'yield'),
                    (313,
                     (292,
                      (293,
                       (294,
                        (295,
                         (297,
                          (298,
                           (299,
                            (300,
                             (301,
                              (302,
                               (303, (304, (305, (2, '1')))))))))))))))))),
                 (4, ''))),
               (6, ''))))),
           (4, ''),
           (0, ''))))
        self.check_bad_tree(tree, "def f():\n  return 1\n  yield 1")

    def test_illegal_yield_2(self):
        # Illegal return in generator: def f(): return 1; yield 1
        tree = \
        (257,
         (264,
          (265,
           (266,
            (278,
             (1, 'from'),
             (281, (1, '__future__')),
             (1, 'import'),
             (279, (1, 'generators')))),
           (4, ''))),
         (264,
          (285,
           (259,
            (1, 'def'),
            (1, 'f'),
            (260, (7, '('), (8, ')')),
            (11, ':'),
            (291,
             (4, ''),
             (5, ''),
             (264,
              (265,
               (266,
                (272,
                 (275,
                  (1, 'return'),
                  (313,
                   (292,
                    (293,
                     (294,
                      (295,
                       (297,
                        (298,
                         (299,
                          (300,
                           (301,
                            (302, (303, (304, (305, (2, '1')))))))))))))))))),
               (264,
                (265,
                 (266,
                  (272,
                   (276,
                    (1, 'yield'),
                    (313,
                     (292,
                      (293,
                       (294,
                        (295,
                         (297,
                          (298,
                           (299,
                            (300,
                             (301,
                              (302,
                               (303, (304, (305, (2, '1')))))))))))))))))),
                 (4, ''))),
               (6, ''))))),
           (4, ''),
           (0, ''))))
        self.check_bad_tree(tree, "def f():\n  return 1\n  yield 1")

    def test_print_chevron_comma(self):
        # Illegal input: print >>fp,
        tree = \
        (257,
         (264,
          (265,
           (266,
            (268,
             (1, 'print'),
             (35, '>>'),
             (290,
              (291,
               (292,
                (293,
                 (295,
                  (296,
                   (297,
                    (298, (299, (300, (301, (302, (303, (1, 'fp')))))))))))))),
             (12, ','))),
           (4, ''))),
         (0, ''))
        self.check_bad_tree(tree, "print >>fp,")

    def test_a_comma_comma_c(self):
        # Illegal input: a,,c
        tree = \
        (258,
         (311,
          (290,
           (291,
            (292,
             (293,
              (295,
               (296,
                (297,
                 (298, (299, (300, (301, (302, (303, (1, 'a')))))))))))))),
          (12, ','),
          (12, ','),
          (290,
           (291,
            (292,
             (293,
              (295,
               (296,
                (297,
                 (298, (299, (300, (301, (302, (303, (1, 'c'))))))))))))))),
         (4, ''),
         (0, ''))
        self.check_bad_tree(tree, "a,,c")

    def test_illegal_operator(self):
        # Illegal input: a $= b
        tree = \
        (257,
         (264,
          (265,
           (266,
            (267,
             (312,
              (291,
               (292,
                (293,
                 (294,
                  (296,
                   (297,
                    (298,
                     (299,
                      (300, (301, (302, (303, (304, (1, 'a'))))))))))))))),
             (268, (37, '$=')),
             (312,
              (291,
               (292,
                (293,
                 (294,
                  (296,
                   (297,
                    (298,
                     (299,
                      (300, (301, (302, (303, (304, (1, 'b'))))))))))))))))),
           (4, ''))),
         (0, ''))
        self.check_bad_tree(tree, "a $= b")

    def test_malformed_global(self):
        #doesn't have global keyword in ast
        tree = (257,
                (264,
                 (265,
                  (266,
                   (282, (1, 'foo'))), (4, ''))),
                (4, ''),
                (0, ''))
        self.check_bad_tree(tree, "malformed global ast")

    def test_missing_import_source(self):
        # from import a
        tree = \
            (257,
             (267,
              (268,
               (269,
                (281,
                 (283, (1, 'from'), (1, 'import'),
                  (286, (284, (1, 'fred')))))),
               (4, ''))),
             (4, ''), (0, ''))
        self.check_bad_tree(tree, "from import a")


class CompileTestCase(unittest.TestCase):

    # These tests are very minimal. :-(

    def test_compile_expr(self):
        st = parser.expr('2 + 3')
        code = parser.compilest(st)
        self.assertEqual(eval(code), 5)

    def test_compile_suite(self):
        st = parser.suite('x = 2; y = x + 3')
        code = parser.compilest(st)
        globs = {}
        exec code in globs
        self.assertEqual(globs['y'], 5)

    def test_compile_error(self):
        st = parser.suite('1 = 3 + 4')
        self.assertRaises(SyntaxError, parser.compilest, st)

    def test_compile_badunicode(self):
        st = parser.suite('a = u"\U12345678"')
        self.assertRaises(SyntaxError, parser.compilest, st)
        st = parser.suite('a = u"\u1"')
        self.assertRaises(SyntaxError, parser.compilest, st)

class ParserStackLimitTestCase(unittest.TestCase):
    """try to push the parser to/over it's limits.
    see http://bugs.python.org/issue1881 for a discussion
    """
    def _nested_expression(self, level):
        return "["*level+"]"*level

    def test_deeply_nested_list(self):
        e = self._nested_expression(99)
        st = parser.expr(e)
        st.compile()

    def test_trigger_memory_error(self):
        e = self._nested_expression(100)
        print >>sys.stderr, "Expecting 's_push: parser stack overflow' in next line"
        self.assertRaises(MemoryError, parser.expr, e)

def test_main():
    test_support.run_unittest(
        RoundtripLegalSyntaxTestCase,
        IllegalSyntaxTestCase,
        CompileTestCase,
        ParserStackLimitTestCase,
    )


if __name__ == "__main__":
    test_main()
Back to Top