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Name	Size	Permission	Date
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test_codecmaps_jp.py	1.7 KB	-rw-r--r--	2026-03-26 17:22
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Rename

""" Tests for the linecache module """

import linecache
import unittest
import os.path
import tempfile
import threading
import tokenize
from importlib.machinery import ModuleSpec
from test import support
from test.support import os_helper
from test.support import threading_helper
from test.support.script_helper import assert_python_ok

FILENAME = linecache.__file__
NONEXISTENT_FILENAME = FILENAME + '.missing'
INVALID_NAME = '!@$)(!@#_1'
EMPTY = ''
TEST_PATH = os.path.dirname(__file__)
MODULES = "linecache abc".split()
MODULE_PATH = os.path.dirname(FILENAME)

SOURCE_1 = '''
" Docstring "

def function():
    return result

'''

SOURCE_2 = '''
def f():
    return 1 + 1

a = f()

'''

SOURCE_3 = '''
def f():
    return 3''' # No ending newline

class TempFile:

def setUp(self):
        super().setUp()
        with tempfile.NamedTemporaryFile(delete=False) as fp:
            self.file_name = fp.name
            fp.write(self.file_byte_string)
        self.addCleanup(os_helper.unlink, self.file_name)

class GetLineTestsGoodData(TempFile):
    # file_list   = ['list\n', 'of\n', 'good\n', 'strings\n']

def setUp(self):
        self.file_byte_string = ''.join(self.file_list).encode('utf-8')
        super().setUp()

def test_getline(self):
        with tokenize.open(self.file_name) as fp:
            for index, line in enumerate(fp):
                if not line.endswith('\n'):
                    line += '\n'

cached_line = linecache.getline(self.file_name, index + 1)
                self.assertEqual(line, cached_line)

def test_getlines(self):
        lines = linecache.getlines(self.file_name)
        self.assertEqual(lines, self.file_list)

class GetLineTestsBadData(TempFile):
    # file_byte_string = b'Bad data goes here'

def test_getline(self):
        self.assertEqual(linecache.getline(self.file_name, 1), '')

def test_getlines(self):
        self.assertEqual(linecache.getlines(self.file_name), [])

class EmptyFile(GetLineTestsGoodData, unittest.TestCase):
    file_list = []

def test_getlines(self):
        lines = linecache.getlines(self.file_name)
        self.assertEqual(lines, ['\n'])

class SingleEmptyLine(GetLineTestsGoodData, unittest.TestCase):
    file_list = ['\n']

class GoodUnicode(GetLineTestsGoodData, unittest.TestCase):
    file_list = ['á\n', 'b\n', 'abcdef\n', 'ááááá\n']

class BadUnicode_NoDeclaration(GetLineTestsBadData, unittest.TestCase):
    file_byte_string = b'\n\x80abc'

class BadUnicode_WithDeclaration(GetLineTestsBadData, unittest.TestCase):
    file_byte_string = b'# coding=utf-8\n\x80abc'

class FakeLoader:
    def get_source(self, fullname):
        return f'source for {fullname}'

class NoSourceLoader:
    def get_source(self, fullname):
        return None

class LineCacheTests(unittest.TestCase):

def test_getline(self):
        getline = linecache.getline

# Bad values for line number should return an empty string
        self.assertEqual(getline(FILENAME, 2**15), EMPTY)
        self.assertEqual(getline(FILENAME, -1), EMPTY)

# Float values currently raise TypeError, should it?
        self.assertRaises(TypeError, getline, FILENAME, 1.1)

# Bad filenames should return an empty string
        self.assertEqual(getline(EMPTY, 1), EMPTY)
        self.assertEqual(getline(INVALID_NAME, 1), EMPTY)

# Check module loading
        for entry in MODULES:
            filename = os.path.join(MODULE_PATH, entry) + '.py'
            with open(filename, encoding='utf-8') as file:
                for index, line in enumerate(file):
                    self.assertEqual(line, getline(filename, index + 1))

# Check that bogus data isn't returned (issue #1309567)
        empty = linecache.getlines('a/b/c/__init__.py')
        self.assertEqual(empty, [])

def test_no_ending_newline(self):
        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
        with open(os_helper.TESTFN, "w", encoding='utf-8') as fp:
            fp.write(SOURCE_3)
        lines = linecache.getlines(os_helper.TESTFN)
        self.assertEqual(lines, ["\n", "def f():\n", "    return 3\n"])

def test_clearcache(self):
        cached = []
        for entry in MODULES:
            filename = os.path.join(MODULE_PATH, entry) + '.py'
            cached.append(filename)
            linecache.getline(filename, 1)

# Are all files cached?
        self.assertNotEqual(cached, [])
        cached_empty = [fn for fn in cached if fn not in linecache.cache]
        self.assertEqual(cached_empty, [])

# Can we clear the cache?
        linecache.clearcache()
        cached_empty = [fn for fn in cached if fn in linecache.cache]
        self.assertEqual(cached_empty, [])

def test_checkcache(self):
        getline = linecache.getline
        # Create a source file and cache its contents
        source_name = os_helper.TESTFN + '.py'
        self.addCleanup(os_helper.unlink, source_name)
        with open(source_name, 'w', encoding='utf-8') as source:
            source.write(SOURCE_1)
        getline(source_name, 1)

# Keep a copy of the old contents
        source_list = []
        with open(source_name, encoding='utf-8') as source:
            for index, line in enumerate(source):
                self.assertEqual(line, getline(source_name, index + 1))
                source_list.append(line)

with open(source_name, 'w', encoding='utf-8') as source:
            source.write(SOURCE_2)

# Try to update a bogus cache entry
        linecache.checkcache('dummy')

# Check that the cache matches the old contents
        for index, line in enumerate(source_list):
            self.assertEqual(line, getline(source_name, index + 1))

# Update the cache and check whether it matches the new source file
        linecache.checkcache(source_name)
        with open(source_name, encoding='utf-8') as source:
            for index, line in enumerate(source):
                self.assertEqual(line, getline(source_name, index + 1))
                source_list.append(line)

def test_lazycache_no_globals(self):
        lines = linecache.getlines(FILENAME)
        linecache.clearcache()
        self.assertEqual(False, linecache.lazycache(FILENAME, None))
        self.assertEqual(lines, linecache.getlines(FILENAME))

def test_lazycache_smoke(self):
        lines = linecache.getlines(NONEXISTENT_FILENAME, globals())
        linecache.clearcache()
        self.assertEqual(
            True, linecache.lazycache(NONEXISTENT_FILENAME, globals()))
        self.assertEqual(1, len(linecache.cache[NONEXISTENT_FILENAME]))
        # Note here that we're looking up a nonexistent filename with no
        # globals: this would error if the lazy value wasn't resolved.
        self.assertEqual(lines, linecache.getlines(NONEXISTENT_FILENAME))

def test_lazycache_provide_after_failed_lookup(self):
        linecache.clearcache()
        lines = linecache.getlines(NONEXISTENT_FILENAME, globals())
        linecache.clearcache()
        linecache.getlines(NONEXISTENT_FILENAME)
        linecache.lazycache(NONEXISTENT_FILENAME, globals())
        self.assertEqual(lines, linecache.updatecache(NONEXISTENT_FILENAME))

def test_lazycache_check(self):
        linecache.clearcache()
        linecache.lazycache(NONEXISTENT_FILENAME, globals())
        linecache.checkcache()

def test_lazycache_bad_filename(self):
        linecache.clearcache()
        self.assertEqual(False, linecache.lazycache('', globals()))
        self.assertEqual(False, linecache.lazycache('<foo>', globals()))

def test_lazycache_already_cached(self):
        linecache.clearcache()
        lines = linecache.getlines(NONEXISTENT_FILENAME, globals())
        self.assertEqual(
            False,
            linecache.lazycache(NONEXISTENT_FILENAME, globals()))
        self.assertEqual(4, len(linecache.cache[NONEXISTENT_FILENAME]))

def test_memoryerror(self):
        lines = linecache.getlines(FILENAME)
        self.assertTrue(lines)
        def raise_memoryerror(*args, **kwargs):
            raise MemoryError
        with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
            lines2 = linecache.getlines(FILENAME)
        self.assertEqual(lines2, lines)

linecache.clearcache()
        with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
            lines3 = linecache.getlines(FILENAME)
        self.assertEqual(lines3, [])
        self.assertEqual(linecache.getlines(FILENAME), lines)

def test_loader(self):
        filename = 'scheme://path'

for loader in (None, object(), NoSourceLoader()):
            linecache.clearcache()
            module_globals = {'__name__': 'a.b.c', '__loader__': loader}
            self.assertEqual(linecache.getlines(filename, module_globals), [])

linecache.clearcache()
        module_globals = {'__name__': 'a.b.c', '__loader__': FakeLoader()}
        self.assertEqual(linecache.getlines(filename, module_globals),
                         ['source for a.b.c\n'])

for spec in (None, object(), ModuleSpec('', FakeLoader())):
            linecache.clearcache()
            module_globals = {'__name__': 'a.b.c', '__loader__': FakeLoader(),
                              '__spec__': spec}
            self.assertEqual(linecache.getlines(filename, module_globals),
                             ['source for a.b.c\n'])

linecache.clearcache()
        spec = ModuleSpec('x.y.z', FakeLoader())
        module_globals = {'__name__': 'a.b.c', '__loader__': spec.loader,
                          '__spec__': spec}
        self.assertEqual(linecache.getlines(filename, module_globals),
                         ['source for x.y.z\n'])

def test_invalid_names(self):
        for name, desc in [
            ('\x00', 'NUL bytes filename'),
            (__file__ + '\x00', 'filename with embedded NUL bytes'),
            # A filename with surrogate codes. A UnicodeEncodeError is raised
            # by os.stat() upon querying, which is a subclass of ValueError.
            ("\uD834\uDD1E.py", 'surrogate codes (MUSICAL SYMBOL G CLEF)'),
            # For POSIX platforms, an OSError will be raised but for Windows
            # platforms, a ValueError is raised due to the path_t converter.
            # See: https://github.com/python/cpython/issues/122170
            ('a' * 1_000_000, 'very long filename'),
        ]:
            with self.subTest(f'updatecache: {desc}'):
                linecache.clearcache()
                lines = linecache.updatecache(name)
                self.assertListEqual(lines, [])
                self.assertNotIn(name, linecache.cache)

# hack into the cache (it shouldn't be allowed
            # but we never know what people do...)
            for key, fullname in [(name, 'ok'), ('key', name), (name, name)]:
                with self.subTest(f'checkcache: {desc}',
                                  key=key, fullname=fullname):
                    linecache.clearcache()
                    linecache.cache[key] = (0, 1234, [], fullname)
                    linecache.checkcache(key)
                    self.assertNotIn(key, linecache.cache)

# just to be sure that we did not mess with cache
        linecache.clearcache()

def test_linecache_python_string(self):
        cmdline = "import linecache;assert len(linecache.cache) == 0"
        retcode, stdout, stderr = assert_python_ok('-c', cmdline)
        self.assertEqual(retcode, 0)
        self.assertEqual(stdout, b'')
        self.assertEqual(stderr, b'')

class LineCacheInvalidationTests(unittest.TestCase):
    def setUp(self):
        super().setUp()
        linecache.clearcache()
        self.deleted_file = os_helper.TESTFN + '.1'
        self.modified_file = os_helper.TESTFN + '.2'
        self.unchanged_file = os_helper.TESTFN + '.3'

for fname in (self.deleted_file,
                      self.modified_file,
                      self.unchanged_file):
            self.addCleanup(os_helper.unlink, fname)
            with open(fname, 'w', encoding='utf-8') as source:
                source.write(f'print("I am {fname}")')

self.assertNotIn(fname, linecache.cache)
            linecache.getlines(fname)
            self.assertIn(fname, linecache.cache)

os.remove(self.deleted_file)
        with open(self.modified_file, 'w', encoding='utf-8') as source:
            source.write('print("was modified")')

def test_checkcache_for_deleted_file(self):
        linecache.checkcache(self.deleted_file)
        self.assertNotIn(self.deleted_file, linecache.cache)
        self.assertIn(self.modified_file, linecache.cache)
        self.assertIn(self.unchanged_file, linecache.cache)

def test_checkcache_for_modified_file(self):
        linecache.checkcache(self.modified_file)
        self.assertIn(self.deleted_file, linecache.cache)
        self.assertNotIn(self.modified_file, linecache.cache)
        self.assertIn(self.unchanged_file, linecache.cache)

def test_checkcache_with_no_parameter(self):
        linecache.checkcache()
        self.assertNotIn(self.deleted_file, linecache.cache)
        self.assertNotIn(self.modified_file, linecache.cache)
        self.assertIn(self.unchanged_file, linecache.cache)

class MultiThreadingTest(unittest.TestCase):
    @threading_helper.reap_threads
    @threading_helper.requires_working_threading()
    def test_read_write_safety(self):

with tempfile.TemporaryDirectory() as tmpdirname:
            filenames = []
            for i in range(10):
                name = os.path.join(tmpdirname, f"test_{i}.py")
                with open(name, "w") as h:
                    h.write("import time\n")
                    h.write("import system\n")
                filenames.append(name)

def linecache_get_line(b):
                b.wait()
                for _ in range(100):
                    for name in filenames:
                        linecache.getline(name, 1)

def check(funcs):
                barrier = threading.Barrier(len(funcs))
                threads = []

for func in funcs:
                    thread = threading.Thread(target=func, args=(barrier,))

threads.append(thread)

with threading_helper.start_threads(threads):
                    pass

check([linecache_get_line] * 20)

if __name__ == "__main__":
    unittest.main()