diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py index ab980793fa71235a172a6da6951bfdf3fa780840..5d946370ee177c141ff13939ddd194d60b3ea687 100644 --- a/Lib/test/test_re.py +++ b/Lib/test/test_re.py @@ -1,6 +1,7 @@ from test.support import (gc_collect, bigmemtest, _2G, cpython_only, captured_stdout, - check_disallow_instantiation, is_emscripten, is_wasi) + check_disallow_instantiation, is_emscripten, is_wasi, + SHORT_TIMEOUT) import locale import re import string @@ -11,6 +12,14 @@ from re import Scanner from weakref import proxy +# some platforms lack working multiprocessing +try: + import _multiprocessing +except ImportError: + multiprocessing = None +else: + import multiprocessing + # Misc tests from Tim Peters' re.doc # WARNING: Don't change details in these tests if you don't know @@ -2438,6 +2447,26 @@ def test_template_function_and_flag_is_deprecated(self): self.assertTrue(template_re1.match('ahoy')) self.assertFalse(template_re1.match('nope')) + @unittest.skipIf(multiprocessing is None, 'test requires multiprocessing') + def test_regression_gh94675(self): + pattern = re.compile(r'(?<=[({}])(((//[^\n]*)?[\n])([\000-\040])*)*' + r'((/[^/\[\n]*(([^\n]|(\[\n]*(]*)*\]))' + r'[^/\[]*)*/))((((//[^\n]*)?[\n])' + r'([\000-\040]|(/\*[^*]*\*+' + r'([^/*]\*+)*/))*)+(?=[^\000-\040);\]}]))') + input_js = '''a(function() { + /////////////////////////////////////////////////////////////////// + });''' + p = multiprocessing.Process(target=pattern.sub, args=('', input_js)) + p.start() + p.join(SHORT_TIMEOUT) + try: + self.assertFalse(p.is_alive(), 'pattern.sub() timed out') + finally: + if p.is_alive(): + p.terminate() + p.join() + def get_debug_out(pat): with captured_stdout() as out: diff --git a/Misc/NEWS.d/next/Tests/2022-07-08-12-22-00.gh-issue-94675.IiTs5f.rst b/Misc/NEWS.d/next/Tests/2022-07-08-12-22-00.gh-issue-94675.IiTs5f.rst new file mode 100644 index 0000000000000000000000000000000000000000..d0005d9f6014cd77379180a5f907861adbad7ce6 --- /dev/null +++ b/Misc/NEWS.d/next/Tests/2022-07-08-12-22-00.gh-issue-94675.IiTs5f.rst @@ -0,0 +1 @@ +Add a regression test for :mod:`re` exponentional slowdown when using rjsmin.