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1"""Test suite for 2to3's parser and grammar files.
2
3This is the place to add tests for changes to 2to3's grammar, such as those
4merging the grammars for Python 2 and 3. In addition to specific tests for
5parts of the grammar we've changed, we also make sure we can parse the
6test_grammar.py files from both Python 2 and Python 3.
7"""
8
9# Testing imports
10from . import support
11from .support import driver, test_dir
12
13# Python imports
14import os
15import shutil
16import subprocess
17import sys
18import tempfile
19import unittest
20
21# Local imports
22from lib2to3.pgen2 import driver as pgen2_driver
23from lib2to3.pgen2 import tokenize
24from ..pgen2.parse import ParseError
25from lib2to3.pygram import python_symbols as syms
26
27
28class TestDriver(support.TestCase):
29
30    def test_formfeed(self):
31        s = """print 1\n\x0Cprint 2\n"""
32        t = driver.parse_string(s)
33        self.assertEqual(t.children[0].children[0].type, syms.print_stmt)
34        self.assertEqual(t.children[1].children[0].type, syms.print_stmt)
35
36
37class TestPgen2Caching(support.TestCase):
38    def test_load_grammar_from_txt_file(self):
39        pgen2_driver.load_grammar(support.grammar_path, save=False, force=True)
40
41    def test_load_grammar_from_pickle(self):
42        # Make a copy of the grammar file in a temp directory we are
43        # guaranteed to be able to write to.
44        tmpdir = tempfile.mkdtemp()
45        try:
46            grammar_copy = os.path.join(
47                    tmpdir, os.path.basename(support.grammar_path))
48            shutil.copy(support.grammar_path, grammar_copy)
49            pickle_name = pgen2_driver._generate_pickle_name(grammar_copy)
50
51            pgen2_driver.load_grammar(grammar_copy, save=True, force=True)
52            self.assertTrue(os.path.exists(pickle_name))
53
54            os.unlink(grammar_copy)  # Only the pickle remains...
55            pgen2_driver.load_grammar(grammar_copy, save=False, force=False)
56        finally:
57            shutil.rmtree(tmpdir)
58
59    @unittest.skipIf(sys.executable is None, 'sys.executable required')
60    def test_load_grammar_from_subprocess(self):
61        tmpdir = tempfile.mkdtemp()
62        tmpsubdir = os.path.join(tmpdir, 'subdir')
63        try:
64            os.mkdir(tmpsubdir)
65            grammar_base = os.path.basename(support.grammar_path)
66            grammar_copy = os.path.join(tmpdir, grammar_base)
67            grammar_sub_copy = os.path.join(tmpsubdir, grammar_base)
68            shutil.copy(support.grammar_path, grammar_copy)
69            shutil.copy(support.grammar_path, grammar_sub_copy)
70            pickle_name = pgen2_driver._generate_pickle_name(grammar_copy)
71            pickle_sub_name = pgen2_driver._generate_pickle_name(
72                     grammar_sub_copy)
73            self.assertNotEqual(pickle_name, pickle_sub_name)
74
75            # Generate a pickle file from this process.
76            pgen2_driver.load_grammar(grammar_copy, save=True, force=True)
77            self.assertTrue(os.path.exists(pickle_name))
78
79            # Generate a new pickle file in a subprocess with a most likely
80            # different hash randomization seed.
81            sub_env = dict(os.environ)
82            sub_env['PYTHONHASHSEED'] = 'random'
83            subprocess.check_call(
84                    [sys.executable, '-c', """
85from lib2to3.pgen2 import driver as pgen2_driver
86pgen2_driver.load_grammar(%r, save=True, force=True)
87                    """ % (grammar_sub_copy,)],
88                    env=sub_env)
89            self.assertTrue(os.path.exists(pickle_sub_name))
90
91            with open(pickle_name, 'rb') as pickle_f_1, \
92                    open(pickle_sub_name, 'rb') as pickle_f_2:
93                self.assertEqual(
94                    pickle_f_1.read(), pickle_f_2.read(),
95                    msg='Grammar caches generated using different hash seeds'
96                    ' were not identical.')
97        finally:
98            shutil.rmtree(tmpdir)
99
100
101
102class GrammarTest(support.TestCase):
103    def validate(self, code):
104        support.parse_string(code)
105
106    def invalid_syntax(self, code):
107        try:
108            self.validate(code)
109        except ParseError:
110            pass
111        else:
112            raise AssertionError("Syntax shouldn't have been valid")
113
114
115class TestMatrixMultiplication(GrammarTest):
116    def test_matrix_multiplication_operator(self):
117        self.validate("a @ b")
118        self.validate("a @= b")
119
120
121class TestYieldFrom(GrammarTest):
122    def test_matrix_multiplication_operator(self):
123        self.validate("yield from x")
124        self.validate("(yield from x) + y")
125        self.invalid_syntax("yield from")
126
127
128class TestRaiseChanges(GrammarTest):
129    def test_2x_style_1(self):
130        self.validate("raise")
131
132    def test_2x_style_2(self):
133        self.validate("raise E, V")
134
135    def test_2x_style_3(self):
136        self.validate("raise E, V, T")
137
138    def test_2x_style_invalid_1(self):
139        self.invalid_syntax("raise E, V, T, Z")
140
141    def test_3x_style(self):
142        self.validate("raise E1 from E2")
143
144    def test_3x_style_invalid_1(self):
145        self.invalid_syntax("raise E, V from E1")
146
147    def test_3x_style_invalid_2(self):
148        self.invalid_syntax("raise E from E1, E2")
149
150    def test_3x_style_invalid_3(self):
151        self.invalid_syntax("raise from E1, E2")
152
153    def test_3x_style_invalid_4(self):
154        self.invalid_syntax("raise E from")
155
156
157# Modelled after Lib/test/test_grammar.py:TokenTests.test_funcdef issue2292
158# and Lib/test/text_parser.py test_list_displays, test_set_displays,
159# test_dict_displays, test_argument_unpacking, ... changes.
160class TestUnpackingGeneralizations(GrammarTest):
161    def test_mid_positional_star(self):
162        self.validate("""func(1, *(2, 3), 4)""")
163
164    def test_double_star_dict_literal(self):
165        self.validate("""func(**{'eggs':'scrambled', 'spam':'fried'})""")
166
167    def test_double_star_dict_literal_after_keywords(self):
168        self.validate("""func(spam='fried', **{'eggs':'scrambled'})""")
169
170    def test_list_display(self):
171        self.validate("""[*{2}, 3, *[4]]""")
172
173    def test_set_display(self):
174        self.validate("""{*{2}, 3, *[4]}""")
175
176    def test_dict_display_1(self):
177        self.validate("""{**{}}""")
178
179    def test_dict_display_2(self):
180        self.validate("""{**{}, 3:4, **{5:6, 7:8}}""")
181
182    def test_argument_unpacking_1(self):
183        self.validate("""f(a, *b, *c, d)""")
184
185    def test_argument_unpacking_2(self):
186        self.validate("""f(**a, **b)""")
187
188    def test_argument_unpacking_3(self):
189        self.validate("""f(2, *a, *b, **b, **c, **d)""")
190
191
192# Adaptated from Python 3's Lib/test/test_grammar.py:GrammarTests.testFuncdef
193class TestFunctionAnnotations(GrammarTest):
194    def test_1(self):
195        self.validate("""def f(x) -> list: pass""")
196
197    def test_2(self):
198        self.validate("""def f(x:int): pass""")
199
200    def test_3(self):
201        self.validate("""def f(*x:str): pass""")
202
203    def test_4(self):
204        self.validate("""def f(**x:float): pass""")
205
206    def test_5(self):
207        self.validate("""def f(x, y:1+2): pass""")
208
209    def test_6(self):
210        self.validate("""def f(a, (b:1, c:2, d)): pass""")
211
212    def test_7(self):
213        self.validate("""def f(a, (b:1, c:2, d), e:3=4, f=5, *g:6): pass""")
214
215    def test_8(self):
216        s = """def f(a, (b:1, c:2, d), e:3=4, f=5,
217                        *g:6, h:7, i=8, j:9=10, **k:11) -> 12: pass"""
218        self.validate(s)
219
220
221class TestExcept(GrammarTest):
222    def test_new(self):
223        s = """
224            try:
225                x
226            except E as N:
227                y"""
228        self.validate(s)
229
230    def test_old(self):
231        s = """
232            try:
233                x
234            except E, N:
235                y"""
236        self.validate(s)
237
238
239# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testAtoms
240class TestSetLiteral(GrammarTest):
241    def test_1(self):
242        self.validate("""x = {'one'}""")
243
244    def test_2(self):
245        self.validate("""x = {'one', 1,}""")
246
247    def test_3(self):
248        self.validate("""x = {'one', 'two', 'three'}""")
249
250    def test_4(self):
251        self.validate("""x = {2, 3, 4,}""")
252
253
254class TestNumericLiterals(GrammarTest):
255    def test_new_octal_notation(self):
256        self.validate("""0o7777777777777""")
257        self.invalid_syntax("""0o7324528887""")
258
259    def test_new_binary_notation(self):
260        self.validate("""0b101010""")
261        self.invalid_syntax("""0b0101021""")
262
263
264class TestClassDef(GrammarTest):
265    def test_new_syntax(self):
266        self.validate("class B(t=7): pass")
267        self.validate("class B(t, *args): pass")
268        self.validate("class B(t, **kwargs): pass")
269        self.validate("class B(t, *args, **kwargs): pass")
270        self.validate("class B(t, y=9, *args, **kwargs): pass")
271
272
273class TestParserIdempotency(support.TestCase):
274
275    """A cut-down version of pytree_idempotency.py."""
276
277    def test_all_project_files(self):
278        if sys.platform.startswith("win"):
279            # XXX something with newlines goes wrong on Windows.
280            return
281        for filepath in support.all_project_files():
282            with open(filepath, "rb") as fp:
283                encoding = tokenize.detect_encoding(fp.readline)[0]
284            self.assertIsNotNone(encoding,
285                                 "can't detect encoding for %s" % filepath)
286            with open(filepath, "r") as fp:
287                source = fp.read()
288                source = source.decode(encoding)
289            tree = driver.parse_string(source)
290            new = unicode(tree)
291            if diff(filepath, new, encoding):
292                self.fail("Idempotency failed: %s" % filepath)
293
294    def test_extended_unpacking(self):
295        driver.parse_string("a, *b, c = x\n")
296        driver.parse_string("[*a, b] = x\n")
297        driver.parse_string("(z, *y, w) = m\n")
298        driver.parse_string("for *z, m in d: pass\n")
299
300class TestLiterals(GrammarTest):
301
302    def validate(self, s):
303        driver.parse_string(support.dedent(s) + "\n\n")
304
305    def test_multiline_bytes_literals(self):
306        s = """
307            md5test(b"\xaa" * 80,
308                    (b"Test Using Larger Than Block-Size Key "
309                     b"and Larger Than One Block-Size Data"),
310                    "6f630fad67cda0ee1fb1f562db3aa53e")
311            """
312        self.validate(s)
313
314    def test_multiline_bytes_tripquote_literals(self):
315        s = '''
316            b"""
317            <?xml version="1.0" encoding="UTF-8"?>
318            <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN">
319            """
320            '''
321        self.validate(s)
322
323    def test_multiline_str_literals(self):
324        s = """
325            md5test("\xaa" * 80,
326                    ("Test Using Larger Than Block-Size Key "
327                     "and Larger Than One Block-Size Data"),
328                    "6f630fad67cda0ee1fb1f562db3aa53e")
329            """
330        self.validate(s)
331
332
333def diff(fn, result, encoding):
334    f = open("@", "w")
335    try:
336        f.write(result.encode(encoding))
337    finally:
338        f.close()
339    try:
340        fn = fn.replace('"', '\\"')
341        return os.system('diff -u "%s" @' % fn)
342    finally:
343        os.remove("@")
344