{{ message }}
-
-
Notifications
You must be signed in to change notification settings - Fork 35.4k
Expand file tree
/
Copy pathtest_c_parser.py
More file actions
559 lines (497 loc) · 20.3 KB
/
Copy pathtest_c_parser.py
File metadata and controls
559 lines (497 loc) · 20.3 KB
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
import contextlib
import subprocess
import sysconfig
import textwrap
import unittest
import os
import shutil
import tempfile
from pathlib import Path
from test import test_tools
from test import support
from test.support import os_helper, import_helper
from test.support.script_helper import assert_python_ok
if support.check_cflags_pgo():
raise unittest.SkipTest("peg_generator test disabled under PGO build")
test_tools.skip_if_missing("peg_generator")
with test_tools.imports_under_tool("peg_generator"):
from pegen.grammar_parser import GeneratedParser as GrammarParser
from pegen.testutil import (
parse_string,
generate_parser_c_extension,
generate_c_parser_source,
)
TEST_TEMPLATE = """
tmp_dir = {extension_path!r}
import ast
import traceback
import sys
import unittest
from test import test_tools
with test_tools.imports_under_tool("peg_generator"):
from pegen.ast_dump import ast_dump
sys.path.insert(0, tmp_dir)
import parse
class Tests(unittest.TestCase):
def check_input_strings_for_grammar(
self,
valid_cases = (),
invalid_cases = (),
):
if valid_cases:
for case in valid_cases:
parse.parse_string(case, mode=0)
if invalid_cases:
for case in invalid_cases:
with self.assertRaises(SyntaxError):
parse.parse_string(case, mode=0)
def verify_ast_generation(self, stmt):
expected_ast = ast.parse(stmt)
actual_ast = parse.parse_string(stmt, mode=1)
self.assertEqual(ast_dump(expected_ast), ast_dump(actual_ast))
def test_parse(self):
{test_source}
unittest.main()
"""
@support.requires_subprocess()
class TestCParser(unittest.TestCase):
_has_run = False
@classmethod
def setUpClass(cls):
if cls._has_run:
# Since gh-104798 (Use setuptools in peg-generator and reenable
# tests), this test case has been producing ref leaks. Initial
# debugging points to bug(s) in setuptools and/or importlib.
# See gh-105063 for more info.
raise unittest.SkipTest("gh-105063: can not rerun because of ref. leaks")
cls._has_run = True
# When running under regtest, a separate tempdir is used
# as the current directory and watched for left-overs.
# Reusing that as the base for temporary directories
# ensures everything is cleaned up properly and
# cleans up afterwards if not (with warnings).
cls.tmp_base = os.getcwd()
if os.path.samefile(cls.tmp_base, os_helper.SAVEDCWD):
cls.tmp_base = None
# Create a directory for the reuseable static library part of
# the pegen extension build process. This greatly reduces the
# runtime overhead of spawning compiler processes.
cls.library_dir = tempfile.mkdtemp(dir=cls.tmp_base)
cls.addClassCleanup(shutil.rmtree, cls.library_dir)
with contextlib.ExitStack() as stack:
python_exe = stack.enter_context(support.setup_venv_with_pip_setuptools("venv"))
def get_sysconfig_path(name):
# Force UTF-8 to emit the non-ASCII venv path in any locale.
return subprocess.check_output(
[python_exe, "-X", "utf8", "-c",
f"import sysconfig; print(sysconfig.get_path({name!r}))"],
encoding="utf-8",
).strip()
platlib_path = get_sysconfig_path("platlib")
purelib_path = get_sysconfig_path("purelib")
stack.enter_context(import_helper.DirsOnSysPath(platlib_path, purelib_path))
cls.addClassCleanup(stack.pop_all().close)
@support.requires_venv_with_pip()
def setUp(self):
self._backup_config_vars = dict(sysconfig._CONFIG_VARS)
cmd = support.missing_compiler_executable()
if cmd is not None:
self.skipTest("The %r command is not found" % cmd)
self.old_cwd = os.getcwd()
self.tmp_path = tempfile.mkdtemp(dir=self.tmp_base)
self.enterContext(os_helper.change_cwd(self.tmp_path))
def tearDown(self):
os.chdir(self.old_cwd)
shutil.rmtree(self.tmp_path)
sysconfig._CONFIG_VARS.clear()
sysconfig._CONFIG_VARS.update(self._backup_config_vars)
def build_extension(self, grammar_source):
grammar = parse_string(grammar_source, GrammarParser)
# Because setUp() already changes the current directory to the
# temporary path, use a relative path here to prevent excessive
# path lengths when compiling.
generate_parser_c_extension(grammar, Path('.'), library_dir=self.library_dir)
def run_test(self, grammar_source, test_source):
self.build_extension(grammar_source)
test_source = textwrap.indent(textwrap.dedent(test_source), 8 * " ")
assert_python_ok(
"-c",
TEST_TEMPLATE.format(extension_path=self.tmp_path, test_source=test_source),
)
def test_prefix_reuses_position(self) -> None:
grammar_source = """
start:
| prefix ':' NAME NEWLINE? ENDMARKER
| prefix ':' NUMBER NEWLINE? ENDMARKER
| prefix '=' NUMBER NEWLINE? ENDMARKER
prefix (memo): NAME NAME
"""
self.run_test(grammar_source, """
self.check_input_strings_for_grammar(
valid_cases=['one two : name', 'one two : 3', 'one two = 3'],
invalid_cases=['one = 3', 'one two = name', 'one two :'],
)
""")
def test_prefix_respects_cut(self) -> None:
grammar_source = """
start:
| prefix ':' ~ NAME NEWLINE? ENDMARKER
| prefix ':' NUMBER NEWLINE? ENDMARKER
prefix (memo): NAME NAME
"""
self.run_test(grammar_source, """
self.check_input_strings_for_grammar(
valid_cases=['one two : name'],
invalid_cases=['one two : 3'],
)
""")
def test_c_parser(self) -> None:
grammar_source = """
start[mod_ty]: a[asdl_stmt_seq*]=stmt* $ { _PyAST_Module(a, NULL, p->arena) }
stmt[stmt_ty]: a=expr_stmt { a }
expr_stmt[stmt_ty]: a=expression NEWLINE { _PyAST_Expr(a, EXTRA) }
expression[expr_ty]: ( l=expression '+' r=term { _PyAST_BinOp(l, Add, r, EXTRA) }
| l=expression '-' r=term { _PyAST_BinOp(l, Sub, r, EXTRA) }
| t=term { t }
)
term[expr_ty]: ( l=term '*' r=factor { _PyAST_BinOp(l, Mult, r, EXTRA) }
| l=term '/' r=factor { _PyAST_BinOp(l, Div, r, EXTRA) }
| f=factor { f }
)
factor[expr_ty]: ('(' e=expression ')' { e }
| a=atom { a }
)
atom[expr_ty]: ( n=NAME { n }
| n=NUMBER { n }
| s=STRING { s }
)
"""
test_source = """
expressions = [
"4+5",
"4-5",
"4*5",
"1+4*5",
"1+4/5",
"(1+1) + (1+1)",
"(1+1) - (1+1)",
"(1+1) * (1+1)",
"(1+1) / (1+1)",
]
for expr in expressions:
the_ast = parse.parse_string(expr, mode=1)
expected_ast = ast.parse(expr)
self.assertEqual(ast_dump(the_ast), ast_dump(expected_ast))
"""
self.run_test(grammar_source, test_source)
def test_lookahead(self) -> None:
grammar_source = """
start: NAME &NAME expr NEWLINE? ENDMARKER
expr: NAME | NUMBER
"""
test_source = """
valid_cases = ["foo bar"]
invalid_cases = ["foo 34"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_negative_lookahead(self) -> None:
grammar_source = """
start: NAME !NAME expr NEWLINE? ENDMARKER
expr: NAME | NUMBER
"""
test_source = """
valid_cases = ["foo 34"]
invalid_cases = ["foo bar"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_cut(self) -> None:
grammar_source = """
start: X ~ Y Z | X Q S
X: 'x'
Y: 'y'
Z: 'z'
Q: 'q'
S: 's'
"""
test_source = """
valid_cases = ["x y z"]
invalid_cases = ["x q s"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_gather(self) -> None:
grammar_source = """
start: ';'.pass_stmt+ NEWLINE
pass_stmt: 'pass'
"""
test_source = """
valid_cases = ["pass", "pass; pass"]
invalid_cases = ["pass;", "pass; pass;"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_left_recursion(self) -> None:
grammar_source = """
start: expr NEWLINE
expr: ('-' term | expr '+' term | term)
term: NUMBER
"""
test_source = """
valid_cases = ["-34", "34", "34 + 12", "1 + 1 + 2 + 3"]
self.check_input_strings_for_grammar(valid_cases)
"""
self.run_test(grammar_source, test_source)
def test_advanced_left_recursive(self) -> None:
grammar_source = """
start: NUMBER | sign start
sign: ['-']
"""
test_source = """
valid_cases = ["23", "-34"]
self.check_input_strings_for_grammar(valid_cases)
"""
self.run_test(grammar_source, test_source)
def test_mutually_left_recursive(self) -> None:
grammar_source = """
start: foo 'E'
foo: bar 'A' | 'B'
bar: foo 'C' | 'D'
"""
test_source = """
valid_cases = ["B E", "D A C A E"]
self.check_input_strings_for_grammar(valid_cases)
"""
self.run_test(grammar_source, test_source)
def test_nasty_mutually_left_recursive(self) -> None:
grammar_source = """
start: target '='
target: maybe '+' | NAME
maybe: maybe '-' | target
"""
test_source = """
valid_cases = ["x ="]
invalid_cases = ["x - + ="]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_return_stmt_noexpr_action(self) -> None:
grammar_source = """
start[mod_ty]: a=[statements] ENDMARKER { _PyAST_Module(a, NULL, p->arena) }
statements[asdl_stmt_seq*]: a[asdl_stmt_seq*]=statement+ { a }
statement[stmt_ty]: simple_stmt
simple_stmt[stmt_ty]: small_stmt
small_stmt[stmt_ty]: return_stmt
return_stmt[stmt_ty]: a='return' NEWLINE { _PyAST_Return(NULL, EXTRA) }
"""
test_source = """
stmt = "return"
self.verify_ast_generation(stmt)
"""
self.run_test(grammar_source, test_source)
def test_gather_action_ast(self) -> None:
grammar_source = """
start[mod_ty]: a[asdl_stmt_seq*]=';'.pass_stmt+ NEWLINE ENDMARKER { _PyAST_Module(a, NULL, p->arena) }
pass_stmt[stmt_ty]: a='pass' { _PyAST_Pass(EXTRA)}
"""
test_source = """
stmt = "pass; pass"
self.verify_ast_generation(stmt)
"""
self.run_test(grammar_source, test_source)
def test_pass_stmt_action(self) -> None:
grammar_source = """
start[mod_ty]: a=[statements] ENDMARKER { _PyAST_Module(a, NULL, p->arena) }
statements[asdl_stmt_seq*]: a[asdl_stmt_seq*]=statement+ { a }
statement[stmt_ty]: simple_stmt
simple_stmt[stmt_ty]: small_stmt
small_stmt[stmt_ty]: pass_stmt
pass_stmt[stmt_ty]: a='pass' NEWLINE { _PyAST_Pass(EXTRA) }
"""
test_source = """
stmt = "pass"
self.verify_ast_generation(stmt)
"""
self.run_test(grammar_source, test_source)
def test_if_stmt_action(self) -> None:
grammar_source = """
start[mod_ty]: a=[statements] ENDMARKER { _PyAST_Module(a, NULL, p->arena) }
statements[asdl_stmt_seq*]: a=statement+ { (asdl_stmt_seq*)_PyPegen_seq_flatten(p, a) }
statement[asdl_stmt_seq*]: a=compound_stmt { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, a) } | simple_stmt
simple_stmt[asdl_stmt_seq*]: a=small_stmt b=further_small_stmt* [';'] NEWLINE {
(asdl_stmt_seq*)_PyPegen_seq_insert_in_front(p, a, b) }
further_small_stmt[stmt_ty]: ';' a=small_stmt { a }
block: simple_stmt | NEWLINE INDENT a=statements DEDENT { a }
compound_stmt: if_stmt
if_stmt: 'if' a=full_expression ':' b=block { _PyAST_If(a, b, NULL, EXTRA) }
small_stmt[stmt_ty]: pass_stmt
pass_stmt[stmt_ty]: a='pass' { _PyAST_Pass(EXTRA) }
full_expression: NAME
"""
test_source = """
stmt = "pass"
self.verify_ast_generation(stmt)
"""
self.run_test(grammar_source, test_source)
def test_same_name_different_types(self) -> None:
grammar_source = """
start[mod_ty]: a[asdl_stmt_seq*]=import_from+ NEWLINE ENDMARKER { _PyAST_Module(a, NULL, p->arena)}
import_from[stmt_ty]: ( a='from' !'import' c=simple_name 'import' d=import_as_names_from {
_PyAST_ImportFrom(c->v.Name.id, d, 0, 0, EXTRA) }
| a='from' '.' 'import' c=import_as_names_from {
_PyAST_ImportFrom(NULL, c, 1, 0, EXTRA) }
)
simple_name[expr_ty]: NAME
import_as_names_from[asdl_alias_seq*]: a[asdl_alias_seq*]=','.import_as_name_from+ { a }
import_as_name_from[alias_ty]: a=NAME 'as' b=NAME { _PyAST_alias(((expr_ty) a)->v.Name.id, ((expr_ty) b)->v.Name.id, EXTRA) }
"""
test_source = """
for stmt in ("from a import b as c", "from . import a as b"):
expected_ast = ast.parse(stmt)
actual_ast = parse.parse_string(stmt, mode=1)
self.assertEqual(ast_dump(expected_ast), ast_dump(actual_ast))
"""
self.run_test(grammar_source, test_source)
def test_with_stmt_with_paren(self) -> None:
grammar_source = """
start[mod_ty]: a=[statements] ENDMARKER { _PyAST_Module(a, NULL, p->arena) }
statements[asdl_stmt_seq*]: a=statement+ { (asdl_stmt_seq*)_PyPegen_seq_flatten(p, a) }
statement[asdl_stmt_seq*]: a=compound_stmt { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, a) }
compound_stmt[stmt_ty]: with_stmt
with_stmt[stmt_ty]: (
a='with' '(' b[asdl_withitem_seq*]=','.with_item+ ')' ':' c=block {
_PyAST_With(b, (asdl_stmt_seq*) _PyPegen_singleton_seq(p, c), NULL, EXTRA) }
)
with_item[withitem_ty]: (
e=NAME o=['as' t=NAME { t }] { _PyAST_withitem(e, _PyPegen_set_expr_context(p, o, Store), p->arena) }
)
block[stmt_ty]: a=pass_stmt NEWLINE { a } | NEWLINE INDENT a=pass_stmt DEDENT { a }
pass_stmt[stmt_ty]: a='pass' { _PyAST_Pass(EXTRA) }
"""
test_source = """
stmt = "with (\\n a as b,\\n c as d\\n): pass"
the_ast = parse.parse_string(stmt, mode=1)
self.assertStartsWith(ast_dump(the_ast),
"Module(body=[With(items=[withitem(context_expr=Name(id='a', ctx=Load()), optional_vars=Name(id='b', ctx=Store())), "
"withitem(context_expr=Name(id='c', ctx=Load()), optional_vars=Name(id='d', ctx=Store()))]"
)
"""
self.run_test(grammar_source, test_source)
def test_ternary_operator(self) -> None:
grammar_source = """
start[mod_ty]: a=expr ENDMARKER { _PyAST_Module(a, NULL, p->arena) }
expr[asdl_stmt_seq*]: a=listcomp NEWLINE { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, _PyAST_Expr(a, EXTRA)) }
listcomp[expr_ty]: (
a='[' b=NAME c=for_if_clauses d=']' { _PyAST_ListComp(b, c, EXTRA) }
)
for_if_clauses[asdl_comprehension_seq*]: (
a[asdl_comprehension_seq*]=(y=['async'] 'for' a=NAME 'in' b=NAME c[asdl_expr_seq*]=('if' z=NAME { z })*
{ _PyAST_comprehension(_PyAST_Name(((expr_ty) a)->v.Name.id, Store, EXTRA), b, c, (y == NULL) ? 0 : 1, p->arena) })+ { a }
)
"""
test_source = """
stmt = "[i for i in a if b]"
self.verify_ast_generation(stmt)
"""
self.run_test(grammar_source, test_source)
def test_syntax_error_for_string(self) -> None:
grammar_source = """
start: expr+ NEWLINE? ENDMARKER
expr: NAME
"""
test_source = r"""
for text in ("a b 42 b a", "\u540d \u540d 42 \u540d \u540d"):
try:
parse.parse_string(text, mode=0)
except SyntaxError as e:
tb = traceback.format_exc()
self.assertTrue('File "<string>", line 1' in tb)
self.assertTrue(f"SyntaxError: invalid syntax" in tb)
"""
self.run_test(grammar_source, test_source)
def test_headers_and_trailer(self) -> None:
grammar_source = """
@header 'SOME HEADER'
@subheader 'SOME SUBHEADER'
@trailer 'SOME TRAILER'
start: expr+ NEWLINE? ENDMARKER
expr: x=NAME
"""
grammar = parse_string(grammar_source, GrammarParser)
parser_source = generate_c_parser_source(grammar)
self.assertTrue("SOME HEADER" in parser_source)
self.assertTrue("SOME SUBHEADER" in parser_source)
self.assertTrue("SOME TRAILER" in parser_source)
def test_error_in_rules(self) -> None:
grammar_source = """
start: expr+ NEWLINE? ENDMARKER
expr: NAME {PyTuple_New(-1)}
"""
# PyTuple_New raises SystemError if an invalid argument was passed.
test_source = """
with self.assertRaises(SystemError):
parse.parse_string("a", mode=0)
"""
self.run_test(grammar_source, test_source)
def test_no_soft_keywords(self) -> None:
grammar_source = """
start: expr+ NEWLINE? ENDMARKER
expr: 'foo'
"""
grammar = parse_string(grammar_source, GrammarParser)
parser_source = generate_c_parser_source(grammar)
assert "expect_soft_keyword" not in parser_source
def test_soft_keywords(self) -> None:
grammar_source = """
start: expr+ NEWLINE? ENDMARKER
expr: "foo"
"""
grammar = parse_string(grammar_source, GrammarParser)
parser_source = generate_c_parser_source(grammar)
assert "expect_soft_keyword" in parser_source
def test_soft_keywords_parse(self) -> None:
grammar_source = """
start: "if" expr '+' expr NEWLINE
expr: NAME
"""
test_source = """
valid_cases = ["if if + if"]
invalid_cases = ["if if"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_soft_keywords_lookahead(self) -> None:
grammar_source = """
start: &"if" "if" expr '+' expr NEWLINE
expr: NAME
"""
test_source = """
valid_cases = ["if if + if"]
invalid_cases = ["if if"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_forced(self) -> None:
grammar_source = """
start: NAME &&':' | NAME
"""
test_source = """
self.assertEqual(parse.parse_string("number :", mode=0), None)
with self.assertRaises(SyntaxError) as e:
parse.parse_string("a", mode=0)
self.assertIn("expected ':'", str(e.exception))
"""
self.run_test(grammar_source, test_source)
def test_forced_with_group(self) -> None:
grammar_source = """
start: NAME &&(':' | ';') | NAME
"""
test_source = """
self.assertEqual(parse.parse_string("number :", mode=0), None)
self.assertEqual(parse.parse_string("number ;", mode=0), None)
with self.assertRaises(SyntaxError) as e:
parse.parse_string("a", mode=0)
self.assertIn("expected (':' | ';')", e.exception.args[0])
"""
self.run_test(grammar_source, test_source)
You can’t perform that action at this time.