Python code coverage for Tools/parser/test_unparse.py

#	count	content
1	n/a	import unittest
2	n/a	import test.support
3	n/a	import io
4	n/a	import os
5	n/a	import random
6	n/a	import tokenize
7	n/a	import unparse
8	n/a	import ast
9	n/a
10	n/a	def read_pyfile(filename):
11	n/a	"""Read and return the contents of a Python source file (as a
12	n/a	string), taking into account the file encoding."""
13	n/a	with open(filename, "rb") as pyfile:
14	n/a	encoding = tokenize.detect_encoding(pyfile.readline)[0]
15	n/a	with open(filename, "r", encoding=encoding) as pyfile:
16	n/a	source = pyfile.read()
17	n/a	return source
18	n/a
19	n/a	for_else = """\
20	n/a	def f():
21	n/a	for x in range(10):
22	n/a	break
23	n/a	else:
24	n/a	y = 2
25	n/a	z = 3
26	n/a	"""
27	n/a
28	n/a	while_else = """\
29	n/a	def g():
30	n/a	while True:
31	n/a	break
32	n/a	else:
33	n/a	y = 2
34	n/a	z = 3
35	n/a	"""
36	n/a
37	n/a	relative_import = """\
38	n/a	from . import fred
39	n/a	from .. import barney
40	n/a	from .australia import shrimp as prawns
41	n/a	"""
42	n/a
43	n/a	nonlocal_ex = """\
44	n/a	def f():
45	n/a	x = 1
46	n/a	def g():
47	n/a	nonlocal x
48	n/a	x = 2
49	n/a	y = 7
50	n/a	def h():
51	n/a	nonlocal x, y
52	n/a	"""
53	n/a
54	n/a	# also acts as test for 'except ... as ...'
55	n/a	raise_from = """\
56	n/a	try:
57	n/a	1 / 0
58	n/a	except ZeroDivisionError as e:
59	n/a	raise ArithmeticError from e
60	n/a	"""
61	n/a
62	n/a	class_decorator = """\
63	n/a	@f1(arg)
64	n/a	@f2
65	n/a	class Foo: pass
66	n/a	"""
67	n/a
68	n/a	elif1 = """\
69	n/a	if cond1:
70	n/a	suite1
71	n/a	elif cond2:
72	n/a	suite2
73	n/a	else:
74	n/a	suite3
75	n/a	"""
76	n/a
77	n/a	elif2 = """\
78	n/a	if cond1:
79	n/a	suite1
80	n/a	elif cond2:
81	n/a	suite2
82	n/a	"""
83	n/a
84	n/a	try_except_finally = """\
85	n/a	try:
86	n/a	suite1
87	n/a	except ex1:
88	n/a	suite2
89	n/a	except ex2:
90	n/a	suite3
91	n/a	else:
92	n/a	suite4
93	n/a	finally:
94	n/a	suite5
95	n/a	"""
96	n/a
97	n/a	with_simple = """\
98	n/a	with f():
99	n/a	suite1
100	n/a	"""
101	n/a
102	n/a	with_as = """\
103	n/a	with f() as x:
104	n/a	suite1
105	n/a	"""
106	n/a
107	n/a	with_two_items = """\
108	n/a	with f() as x, g() as y:
109	n/a	suite1
110	n/a	"""
111	n/a
112	n/a	class ASTTestCase(unittest.TestCase):
113	n/a	def assertASTEqual(self, ast1, ast2):
114	n/a	self.assertEqual(ast.dump(ast1), ast.dump(ast2))
115	n/a
116	n/a	def check_roundtrip(self, code1, filename="internal"):
117	n/a	ast1 = compile(code1, filename, "exec", ast.PyCF_ONLY_AST)
118	n/a	unparse_buffer = io.StringIO()
119	n/a	unparse.Unparser(ast1, unparse_buffer)
120	n/a	code2 = unparse_buffer.getvalue()
121	n/a	ast2 = compile(code2, filename, "exec", ast.PyCF_ONLY_AST)
122	n/a	self.assertASTEqual(ast1, ast2)
123	n/a
124	n/a	class UnparseTestCase(ASTTestCase):
125	n/a	# Tests for specific bugs found in earlier versions of unparse
126	n/a
127	n/a	def test_del_statement(self):
128	n/a	self.check_roundtrip("del x, y, z")
129	n/a
130	n/a	def test_shifts(self):
131	n/a	self.check_roundtrip("45 << 2")
132	n/a	self.check_roundtrip("13 >> 7")
133	n/a
134	n/a	def test_for_else(self):
135	n/a	self.check_roundtrip(for_else)
136	n/a
137	n/a	def test_while_else(self):
138	n/a	self.check_roundtrip(while_else)
139	n/a
140	n/a	def test_unary_parens(self):
141	n/a	self.check_roundtrip("(-1)**7")
142	n/a	self.check_roundtrip("(-1.)**8")
143	n/a	self.check_roundtrip("(-1j)**6")
144	n/a	self.check_roundtrip("not True or False")
145	n/a	self.check_roundtrip("True or not False")
146	n/a
147	n/a	def test_integer_parens(self):
148	n/a	self.check_roundtrip("3 .__abs__()")
149	n/a
150	n/a	def test_huge_float(self):
151	n/a	self.check_roundtrip("1e1000")
152	n/a	self.check_roundtrip("-1e1000")
153	n/a	self.check_roundtrip("1e1000j")
154	n/a	self.check_roundtrip("-1e1000j")
155	n/a
156	n/a	def test_min_int(self):
157	n/a	self.check_roundtrip(str(-2**31))
158	n/a	self.check_roundtrip(str(-2**63))
159	n/a
160	n/a	def test_imaginary_literals(self):
161	n/a	self.check_roundtrip("7j")
162	n/a	self.check_roundtrip("-7j")
163	n/a	self.check_roundtrip("0j")
164	n/a	self.check_roundtrip("-0j")
165	n/a
166	n/a	def test_lambda_parentheses(self):
167	n/a	self.check_roundtrip("(lambda: int)()")
168	n/a
169	n/a	def test_chained_comparisons(self):
170	n/a	self.check_roundtrip("1 < 4 <= 5")
171	n/a	self.check_roundtrip("a is b is c is not d")
172	n/a
173	n/a	def test_function_arguments(self):
174	n/a	self.check_roundtrip("def f(): pass")
175	n/a	self.check_roundtrip("def f(a): pass")
176	n/a	self.check_roundtrip("def f(b = 2): pass")
177	n/a	self.check_roundtrip("def f(a, b): pass")
178	n/a	self.check_roundtrip("def f(a, b = 2): pass")
179	n/a	self.check_roundtrip("def f(a = 5, b = 2): pass")
180	n/a	self.check_roundtrip("def f(*, a = 1, b = 2): pass")
181	n/a	self.check_roundtrip("def f(*, a = 1, b): pass")
182	n/a	self.check_roundtrip("def f(*, a, b = 2): pass")
183	n/a	self.check_roundtrip("def f(a, b = None, , c, *kwds): pass")
184	n/a	self.check_roundtrip("def f(a=2, args, c=5, d, *kwds): pass")
185	n/a	self.check_roundtrip("def f(args, *kwargs): pass")
186	n/a
187	n/a	def test_relative_import(self):
188	n/a	self.check_roundtrip(relative_import)
189	n/a
190	n/a	def test_nonlocal(self):
191	n/a	self.check_roundtrip(nonlocal_ex)
192	n/a
193	n/a	def test_raise_from(self):
194	n/a	self.check_roundtrip(raise_from)
195	n/a
196	n/a	def test_bytes(self):
197	n/a	self.check_roundtrip("b'123'")
198	n/a
199	n/a	def test_annotations(self):
200	n/a	self.check_roundtrip("def f(a : int): pass")
201	n/a	self.check_roundtrip("def f(a: int = 5): pass")
202	n/a	self.check_roundtrip("def f(*args: [int]): pass")
203	n/a	self.check_roundtrip("def f(**kwargs: dict): pass")
204	n/a	self.check_roundtrip("def f() -> None: pass")
205	n/a
206	n/a	def test_set_literal(self):
207	n/a	self.check_roundtrip("{'a', 'b', 'c'}")
208	n/a
209	n/a	def test_set_comprehension(self):
210	n/a	self.check_roundtrip("{x for x in range(5)}")
211	n/a
212	n/a	def test_dict_comprehension(self):
213	n/a	self.check_roundtrip("{x: x*x for x in range(10)}")
214	n/a
215	n/a	def test_class_decorators(self):
216	n/a	self.check_roundtrip(class_decorator)
217	n/a
218	n/a	def test_class_definition(self):
219	n/a	self.check_roundtrip("class A(metaclass=type, [], *{}): pass")
220	n/a
221	n/a	def test_elifs(self):
222	n/a	self.check_roundtrip(elif1)
223	n/a	self.check_roundtrip(elif2)
224	n/a
225	n/a	def test_try_except_finally(self):
226	n/a	self.check_roundtrip(try_except_finally)
227	n/a
228	n/a	def test_starred_assignment(self):
229	n/a	self.check_roundtrip("a, *b, c = seq")
230	n/a	self.check_roundtrip("a, (*b, c) = seq")
231	n/a	self.check_roundtrip("a, *b[0], c = seq")
232	n/a	self.check_roundtrip("a, *(b, c) = seq")
233	n/a
234	n/a	def test_with_simple(self):
235	n/a	self.check_roundtrip(with_simple)
236	n/a
237	n/a	def test_with_as(self):
238	n/a	self.check_roundtrip(with_as)
239	n/a
240	n/a	def test_with_two_items(self):
241	n/a	self.check_roundtrip(with_two_items)
242	n/a
243	n/a
244	n/a	class DirectoryTestCase(ASTTestCase):
245	n/a	"""Test roundtrip behaviour on all files in Lib and Lib/test."""
246	n/a
247	n/a	# test directories, relative to the root of the distribution
248	n/a	test_directories = 'Lib', os.path.join('Lib', 'test')
249	n/a
250	n/a	def test_files(self):
251	n/a	# get names of files to test
252	n/a	dist_dir = os.path.join(os.path.dirname(__file__), os.pardir, os.pardir)
253	n/a
254	n/a	names = []
255	n/a	for d in self.test_directories:
256	n/a	test_dir = os.path.join(dist_dir, d)
257	n/a	for n in os.listdir(test_dir):
258	n/a	if n.endswith('.py') and not n.startswith('bad'):
259	n/a	names.append(os.path.join(test_dir, n))
260	n/a
261	n/a	# Test limited subset of files unless the 'cpu' resource is specified.
262	n/a	if not test.support.is_resource_enabled("cpu"):
263	n/a	names = random.sample(names, 10)
264	n/a
265	n/a	for filename in names:
266	n/a	if test.support.verbose:
267	n/a	print('Testing %s' % filename)
268	n/a	source = read_pyfile(filename)
269	n/a	self.check_roundtrip(source)
270	n/a
271	n/a
272	n/a	def test_main():
273	n/a	test.support.run_unittest(UnparseTestCase, DirectoryTestCase)
274	n/a
275	n/a	if __name__ == '__main__':
276	n/a	test_main()