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gerrit-public.fairphone.software / platform / external / python / cpython3 / 876032e5700f58cec44a357b6d3174be76b40278 / . / Lib / test / test_parser.py
blob: 978ce5712c4faa12b1647f9a1c015d26250dfea0 [file] [log] [blame]
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]1import parser
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]2import unittest
Barry Warsaw04f357c2002-07-23 19:04:11 +0000[diff] [blame]3from test import test_support
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]4
5#
6# First, we test that we can generate trees from valid source fragments,
7# and that these valid trees are indeed allowed by the tree-loading side
8# of the parser module.
9#
10
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]11class RoundtripLegalSyntaxTestCase(unittest.TestCase):
Guido van Rossum32c2ae72002-08-22 19:45:32 +0000[diff] [blame]12
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]13 def roundtrip(self, f, s):
14 st1 = f(s)
15 t = st1.totuple()
16 try:
Fred Drake6e4f2c02001-07-17 19:33:25 +0000[diff] [blame]17 st2 = parser.sequence2st(t)
Anthony Baxterc2a5a632004-08-02 06:10:11 +0000[diff] [blame]18 except parser.ParserError, why:
19 self.fail("could not roundtrip %r: %s" % (s, why))
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]20
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]21 self.assertEquals(t, st2.totuple(),
22 "could not re-generate syntax tree")
Fred Drake28f739a2000-08-25 22:42:40 +0000[diff] [blame]23
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]24 def check_expr(self, s):
25 self.roundtrip(parser.expr, s)
Fred Drake28f739a2000-08-25 22:42:40 +0000[diff] [blame]26
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]27 def check_suite(self, s):
28 self.roundtrip(parser.suite, s)
Fred Drake28f739a2000-08-25 22:42:40 +0000[diff] [blame]29
Fred Drakecf580c72001-07-17 03:01:29 +0000[diff] [blame]30 def test_yield_statement(self):
Tim Peters496563a2002-04-01 00:28:59 +0000[diff] [blame]31 self.check_suite("def f(): yield 1")
32 self.check_suite("def f(): return; yield 1")
33 self.check_suite("def f(): yield 1; return")
34 self.check_suite("def f():\n"
Fred Drakecf580c72001-07-17 03:01:29 +0000[diff] [blame]35 " for x in range(30):\n"
36 " yield x\n")
37
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]38 def test_expressions(self):
39 self.check_expr("foo(1)")
40 self.check_expr("[1, 2, 3]")
41 self.check_expr("[x**3 for x in range(20)]")
42 self.check_expr("[x**3 for x in range(20) if x % 3]")
43 self.check_expr("foo(*args)")
44 self.check_expr("foo(*args, **kw)")
45 self.check_expr("foo(**kw)")
46 self.check_expr("foo(key=value)")
47 self.check_expr("foo(key=value, *args)")
48 self.check_expr("foo(key=value, *args, **kw)")
49 self.check_expr("foo(key=value, **kw)")
50 self.check_expr("foo(a, b, c, *args)")
51 self.check_expr("foo(a, b, c, *args, **kw)")
52 self.check_expr("foo(a, b, c, **kw)")
53 self.check_expr("foo + bar")
Michael W. Hudson5e83b7a2003-01-29 14:20:23 +0000[diff] [blame]54 self.check_expr("foo - bar")
55 self.check_expr("foo * bar")
56 self.check_expr("foo / bar")
57 self.check_expr("foo // bar")
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]58 self.check_expr("lambda: 0")
59 self.check_expr("lambda x: 0")
60 self.check_expr("lambda *y: 0")
61 self.check_expr("lambda *y, **z: 0")
62 self.check_expr("lambda **z: 0")
63 self.check_expr("lambda x, y: 0")
64 self.check_expr("lambda foo=bar: 0")
65 self.check_expr("lambda foo=bar, spaz=nifty+spit: 0")
66 self.check_expr("lambda foo=bar, **z: 0")
67 self.check_expr("lambda foo=bar, blaz=blat+2, **z: 0")
68 self.check_expr("lambda foo=bar, blaz=blat+2, *y, **z: 0")
69 self.check_expr("lambda x, *y, **z: 0")
Raymond Hettinger354433a2004-05-19 08:20:33 +0000[diff] [blame]70 self.check_expr("(x for x in range(10))")
71 self.check_expr("foo(x for x in range(10))")
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]72
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]73 def test_print(self):
74 self.check_suite("print")
75 self.check_suite("print 1")
76 self.check_suite("print 1,")
77 self.check_suite("print >>fp")
78 self.check_suite("print >>fp, 1")
79 self.check_suite("print >>fp, 1,")
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]80
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]81 def test_simple_expression(self):
82 # expr_stmt
83 self.check_suite("a")
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]84
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]85 def test_simple_assignments(self):
86 self.check_suite("a = b")
87 self.check_suite("a = b = c = d = e")
Fred Drake28f739a2000-08-25 22:42:40 +0000[diff] [blame]88
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]89 def test_simple_augmented_assignments(self):
90 self.check_suite("a += b")
91 self.check_suite("a -= b")
92 self.check_suite("a *= b")
93 self.check_suite("a /= b")
Michael W. Hudson5e83b7a2003-01-29 14:20:23 +0000[diff] [blame]94 self.check_suite("a //= b")
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]95 self.check_suite("a %= b")
96 self.check_suite("a &= b")
97 self.check_suite("a |= b")
98 self.check_suite("a ^= b")
99 self.check_suite("a <<= b")
100 self.check_suite("a >>= b")
101 self.check_suite("a **= b")
Fred Drakee3fb18c2001-01-07 06:02:19 +0000[diff] [blame]102
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]103 def test_function_defs(self):
104 self.check_suite("def f(): pass")
105 self.check_suite("def f(*args): pass")
106 self.check_suite("def f(*args, **kw): pass")
107 self.check_suite("def f(**kw): pass")
108 self.check_suite("def f(foo=bar): pass")
109 self.check_suite("def f(foo=bar, *args): pass")
110 self.check_suite("def f(foo=bar, *args, **kw): pass")
111 self.check_suite("def f(foo=bar, **kw): pass")
Fred Drakee3fb18c2001-01-07 06:02:19 +0000[diff] [blame]112
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]113 self.check_suite("def f(a, b): pass")
114 self.check_suite("def f(a, b, *args): pass")
115 self.check_suite("def f(a, b, *args, **kw): pass")
116 self.check_suite("def f(a, b, **kw): pass")
117 self.check_suite("def f(a, b, foo=bar): pass")
118 self.check_suite("def f(a, b, foo=bar, *args): pass")
119 self.check_suite("def f(a, b, foo=bar, *args, **kw): pass")
120 self.check_suite("def f(a, b, foo=bar, **kw): pass")
Fred Drakee3fb18c2001-01-07 06:02:19 +0000[diff] [blame]121
Anthony Baxterc2a5a632004-08-02 06:10:11 +0000[diff] [blame]122 self.check_suite("@staticmethod\n"
123 "def f(): pass")
124 self.check_suite("@staticmethod\n"
125 "@funcattrs(x, y)\n"
126 "def f(): pass")
127 self.check_suite("@funcattrs()\n"
128 "def f(): pass")
129
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]130 def test_import_from_statement(self):
131 self.check_suite("from sys.path import *")
132 self.check_suite("from sys.path import dirname")
133 self.check_suite("from sys.path import dirname as my_dirname")
134 self.check_suite("from sys.path import dirname, basename")
135 self.check_suite(
136 "from sys.path import dirname as my_dirname, basename")
137 self.check_suite(
138 "from sys.path import dirname, basename as my_basename")
Fred Drakee3fb18c2001-01-07 06:02:19 +0000[diff] [blame]139
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]140 def test_basic_import_statement(self):
141 self.check_suite("import sys")
142 self.check_suite("import sys as system")
143 self.check_suite("import sys, math")
144 self.check_suite("import sys as system, math")
145 self.check_suite("import sys, math as my_math")
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]146
Neal Norwitz9caf9c02003-02-10 01:54:06 +0000[diff] [blame]147 def test_pep263(self):
148 self.check_suite("# -*- coding: iso-8859-1 -*-\n"
149 "pass\n")
150
151 def test_assert(self):
152 self.check_suite("assert alo < ahi and blo < bhi\n")
153
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]154#
155# Second, we take *invalid* trees and make sure we get ParserError
156# rejections for them.
157#
158
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]159class IllegalSyntaxTestCase(unittest.TestCase):
Guido van Rossum32c2ae72002-08-22 19:45:32 +0000[diff] [blame]160
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]161 def check_bad_tree(self, tree, label):
162 try:
Fred Drake6e4f2c02001-07-17 19:33:25 +0000[diff] [blame]163 parser.sequence2st(tree)
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]164 except parser.ParserError:
165 pass
166 else:
167 self.fail("did not detect invalid tree for %r" % label)
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]168
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]169 def test_junk(self):
170 # not even remotely valid:
171 self.check_bad_tree((1, 2, 3), "<junk>")
172
Fred Drakecf580c72001-07-17 03:01:29 +0000[diff] [blame]173 def test_illegal_yield_1(self):
Guido van Rossum32c2ae72002-08-22 19:45:32 +0000[diff] [blame]174 # Illegal yield statement: def f(): return 1; yield 1
Fred Drakecf580c72001-07-17 03:01:29 +0000[diff] [blame]175 tree = \
176 (257,
177 (264,
178 (285,
179 (259,
180 (1, 'def'),
181 (1, 'f'),
182 (260, (7, '('), (8, ')')),
183 (11, ':'),
184 (291,
185 (4, ''),
186 (5, ''),
187 (264,
188 (265,
189 (266,
190 (272,
191 (275,
192 (1, 'return'),
193 (313,
194 (292,
195 (293,
196 (294,
197 (295,
198 (297,
199 (298,
200 (299,
201 (300,
202 (301,
203 (302, (303, (304, (305, (2, '1')))))))))))))))))),
204 (264,
205 (265,
206 (266,
207 (272,
208 (276,
209 (1, 'yield'),
210 (313,
211 (292,
212 (293,
213 (294,
214 (295,
215 (297,
216 (298,
217 (299,
218 (300,
219 (301,
220 (302,
221 (303, (304, (305, (2, '1')))))))))))))))))),
222 (4, ''))),
223 (6, ''))))),
224 (4, ''),
225 (0, ''))))
226 self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
227
228 def test_illegal_yield_2(self):
Guido van Rossum32c2ae72002-08-22 19:45:32 +0000[diff] [blame]229 # Illegal return in generator: def f(): return 1; yield 1
Fred Drakecf580c72001-07-17 03:01:29 +0000[diff] [blame]230 tree = \
231 (257,
232 (264,
233 (265,
234 (266,
235 (278,
236 (1, 'from'),
237 (281, (1, '__future__')),
238 (1, 'import'),
239 (279, (1, 'generators')))),
240 (4, ''))),
241 (264,
242 (285,
243 (259,
244 (1, 'def'),
245 (1, 'f'),
246 (260, (7, '('), (8, ')')),
247 (11, ':'),
248 (291,
249 (4, ''),
250 (5, ''),
251 (264,
252 (265,
253 (266,
254 (272,
255 (275,
256 (1, 'return'),
257 (313,
258 (292,
259 (293,
260 (294,
261 (295,
262 (297,
263 (298,
264 (299,
265 (300,
266 (301,
267 (302, (303, (304, (305, (2, '1')))))))))))))))))),
268 (264,
269 (265,
270 (266,
271 (272,
272 (276,
273 (1, 'yield'),
274 (313,
275 (292,
276 (293,
277 (294,
278 (295,
279 (297,
280 (298,
281 (299,
282 (300,
283 (301,
284 (302,
285 (303, (304, (305, (2, '1')))))))))))))))))),
286 (4, ''))),
287 (6, ''))))),
288 (4, ''),
289 (0, ''))))
290 self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
291
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]292 def test_print_chevron_comma(self):
Guido van Rossum32c2ae72002-08-22 19:45:32 +0000[diff] [blame]293 # Illegal input: print >>fp,
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]294 tree = \
295 (257,
296 (264,
297 (265,
298 (266,
299 (268,
300 (1, 'print'),
301 (35, '>>'),
302 (290,
303 (291,
304 (292,
305 (293,
306 (295,
307 (296,
308 (297,
309 (298, (299, (300, (301, (302, (303, (1, 'fp')))))))))))))),
310 (12, ','))),
311 (4, ''))),
312 (0, ''))
313 self.check_bad_tree(tree, "print >>fp,")
314
315 def test_a_comma_comma_c(self):
Guido van Rossum32c2ae72002-08-22 19:45:32 +0000[diff] [blame]316 # Illegal input: a,,c
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]317 tree = \
318 (258,
319 (311,
320 (290,
321 (291,
322 (292,
323 (293,
324 (295,
325 (296,
326 (297,
327 (298, (299, (300, (301, (302, (303, (1, 'a')))))))))))))),
328 (12, ','),
329 (12, ','),
330 (290,
331 (291,
332 (292,
333 (293,
334 (295,
335 (296,
336 (297,
337 (298, (299, (300, (301, (302, (303, (1, 'c'))))))))))))))),
338 (4, ''),
339 (0, ''))
340 self.check_bad_tree(tree, "a,,c")
341
342 def test_illegal_operator(self):
Guido van Rossum32c2ae72002-08-22 19:45:32 +0000[diff] [blame]343 # Illegal input: a $= b
Fred Drake58422e52001-06-04 03:56:24 +0000[diff] [blame]344 tree = \
345 (257,
346 (264,
347 (265,
348 (266,
349 (267,
350 (312,
351 (291,
352 (292,
353 (293,
354 (294,
355 (296,
356 (297,
357 (298,
358 (299,
359 (300, (301, (302, (303, (304, (1, 'a'))))))))))))))),
360 (268, (37, '$=')),
361 (312,
362 (291,
363 (292,
364 (293,
365 (294,
366 (296,
367 (297,
368 (298,
369 (299,
370 (300, (301, (302, (303, (304, (1, 'b'))))))))))))))))),
371 (4, ''))),
372 (0, ''))
373 self.check_bad_tree(tree, "a $= b")
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]374
Neal Norwitz9caf9c02003-02-10 01:54:06 +0000[diff] [blame]375 def test_malformed_global(self):
376 #doesn't have global keyword in ast
377 tree = (257,
378 (264,
379 (265,
380 (266,
381 (282, (1, 'foo'))), (4, ''))),
382 (4, ''),
Tim Petersf2715e02003-02-19 02:35:07 +0000[diff] [blame]383 (0, ''))
Neal Norwitz9caf9c02003-02-10 01:54:06 +0000[diff] [blame]384 self.check_bad_tree(tree, "malformed global ast")
Fred Drake79ca79d2000-08-21 22:30:53 +0000[diff] [blame]385
Fred Drake2e2be372001-09-20 21:33:42 +0000[diff] [blame]386def test_main():
Walter Dörwald21d3a322003-05-01 17:45:56 +0000[diff] [blame]387 test_support.run_unittest(
388 RoundtripLegalSyntaxTestCase,
389 IllegalSyntaxTestCase
390 )
Fred Drake2e2be372001-09-20 21:33:42 +0000[diff] [blame]391
392
393if __name__ == "__main__":
394 test_main()