mirror of https://github.com/python/cpython
328 lines
11 KiB
Python
328 lines
11 KiB
Python
""" Tests for the linecache module """
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import linecache
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import unittest
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import os.path
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import tempfile
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import tokenize
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from importlib.machinery import ModuleSpec
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from test import support
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from test.support import os_helper
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FILENAME = linecache.__file__
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NONEXISTENT_FILENAME = FILENAME + '.missing'
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INVALID_NAME = '!@$)(!@#_1'
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EMPTY = ''
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TEST_PATH = os.path.dirname(__file__)
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MODULES = "linecache abc".split()
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MODULE_PATH = os.path.dirname(FILENAME)
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SOURCE_1 = '''
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" Docstring "
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def function():
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return result
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'''
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SOURCE_2 = '''
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def f():
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return 1 + 1
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a = f()
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'''
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SOURCE_3 = '''
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def f():
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return 3''' # No ending newline
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class TempFile:
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def setUp(self):
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super().setUp()
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with tempfile.NamedTemporaryFile(delete=False) as fp:
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self.file_name = fp.name
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fp.write(self.file_byte_string)
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self.addCleanup(os_helper.unlink, self.file_name)
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class GetLineTestsGoodData(TempFile):
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# file_list = ['list\n', 'of\n', 'good\n', 'strings\n']
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def setUp(self):
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self.file_byte_string = ''.join(self.file_list).encode('utf-8')
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super().setUp()
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def test_getline(self):
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with tokenize.open(self.file_name) as fp:
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for index, line in enumerate(fp):
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if not line.endswith('\n'):
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line += '\n'
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cached_line = linecache.getline(self.file_name, index + 1)
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self.assertEqual(line, cached_line)
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def test_getlines(self):
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lines = linecache.getlines(self.file_name)
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self.assertEqual(lines, self.file_list)
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class GetLineTestsBadData(TempFile):
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# file_byte_string = b'Bad data goes here'
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def test_getline(self):
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self.assertEqual(linecache.getline(self.file_name, 1), '')
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def test_getlines(self):
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self.assertEqual(linecache.getlines(self.file_name), [])
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class EmptyFile(GetLineTestsGoodData, unittest.TestCase):
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file_list = []
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def test_getlines(self):
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lines = linecache.getlines(self.file_name)
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self.assertEqual(lines, ['\n'])
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class SingleEmptyLine(GetLineTestsGoodData, unittest.TestCase):
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file_list = ['\n']
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class GoodUnicode(GetLineTestsGoodData, unittest.TestCase):
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file_list = ['á\n', 'b\n', 'abcdef\n', 'ááááá\n']
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class BadUnicode_NoDeclaration(GetLineTestsBadData, unittest.TestCase):
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file_byte_string = b'\n\x80abc'
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class BadUnicode_WithDeclaration(GetLineTestsBadData, unittest.TestCase):
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file_byte_string = b'# coding=utf-8\n\x80abc'
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class FakeLoader:
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def get_source(self, fullname):
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return f'source for {fullname}'
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class NoSourceLoader:
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def get_source(self, fullname):
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return None
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class LineCacheTests(unittest.TestCase):
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def test_getline(self):
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getline = linecache.getline
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# Bad values for line number should return an empty string
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self.assertEqual(getline(FILENAME, 2**15), EMPTY)
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self.assertEqual(getline(FILENAME, -1), EMPTY)
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# Float values currently raise TypeError, should it?
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self.assertRaises(TypeError, getline, FILENAME, 1.1)
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# Bad filenames should return an empty string
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self.assertEqual(getline(EMPTY, 1), EMPTY)
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self.assertEqual(getline(INVALID_NAME, 1), EMPTY)
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# Check module loading
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for entry in MODULES:
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filename = os.path.join(MODULE_PATH, entry) + '.py'
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with open(filename, encoding='utf-8') as file:
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for index, line in enumerate(file):
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self.assertEqual(line, getline(filename, index + 1))
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# Check that bogus data isn't returned (issue #1309567)
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empty = linecache.getlines('a/b/c/__init__.py')
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self.assertEqual(empty, [])
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def test_no_ending_newline(self):
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self.addCleanup(os_helper.unlink, os_helper.TESTFN)
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with open(os_helper.TESTFN, "w", encoding='utf-8') as fp:
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fp.write(SOURCE_3)
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lines = linecache.getlines(os_helper.TESTFN)
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self.assertEqual(lines, ["\n", "def f():\n", " return 3\n"])
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def test_clearcache(self):
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cached = []
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for entry in MODULES:
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filename = os.path.join(MODULE_PATH, entry) + '.py'
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cached.append(filename)
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linecache.getline(filename, 1)
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# Are all files cached?
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self.assertNotEqual(cached, [])
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cached_empty = [fn for fn in cached if fn not in linecache.cache]
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self.assertEqual(cached_empty, [])
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# Can we clear the cache?
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linecache.clearcache()
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cached_empty = [fn for fn in cached if fn in linecache.cache]
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self.assertEqual(cached_empty, [])
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def test_checkcache(self):
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getline = linecache.getline
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# Create a source file and cache its contents
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source_name = os_helper.TESTFN + '.py'
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self.addCleanup(os_helper.unlink, source_name)
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with open(source_name, 'w', encoding='utf-8') as source:
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source.write(SOURCE_1)
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getline(source_name, 1)
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# Keep a copy of the old contents
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source_list = []
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with open(source_name, encoding='utf-8') as source:
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for index, line in enumerate(source):
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self.assertEqual(line, getline(source_name, index + 1))
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source_list.append(line)
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with open(source_name, 'w', encoding='utf-8') as source:
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source.write(SOURCE_2)
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# Try to update a bogus cache entry
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linecache.checkcache('dummy')
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# Check that the cache matches the old contents
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for index, line in enumerate(source_list):
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self.assertEqual(line, getline(source_name, index + 1))
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# Update the cache and check whether it matches the new source file
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linecache.checkcache(source_name)
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with open(source_name, encoding='utf-8') as source:
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for index, line in enumerate(source):
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self.assertEqual(line, getline(source_name, index + 1))
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source_list.append(line)
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def test_lazycache_no_globals(self):
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lines = linecache.getlines(FILENAME)
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linecache.clearcache()
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self.assertEqual(False, linecache.lazycache(FILENAME, None))
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self.assertEqual(lines, linecache.getlines(FILENAME))
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def test_lazycache_smoke(self):
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lines = linecache.getlines(NONEXISTENT_FILENAME, globals())
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linecache.clearcache()
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self.assertEqual(
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True, linecache.lazycache(NONEXISTENT_FILENAME, globals()))
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self.assertEqual(1, len(linecache.cache[NONEXISTENT_FILENAME]))
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# Note here that we're looking up a nonexistent filename with no
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# globals: this would error if the lazy value wasn't resolved.
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self.assertEqual(lines, linecache.getlines(NONEXISTENT_FILENAME))
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def test_lazycache_provide_after_failed_lookup(self):
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linecache.clearcache()
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lines = linecache.getlines(NONEXISTENT_FILENAME, globals())
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linecache.clearcache()
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linecache.getlines(NONEXISTENT_FILENAME)
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linecache.lazycache(NONEXISTENT_FILENAME, globals())
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self.assertEqual(lines, linecache.updatecache(NONEXISTENT_FILENAME))
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def test_lazycache_check(self):
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linecache.clearcache()
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linecache.lazycache(NONEXISTENT_FILENAME, globals())
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linecache.checkcache()
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def test_lazycache_bad_filename(self):
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linecache.clearcache()
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self.assertEqual(False, linecache.lazycache('', globals()))
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self.assertEqual(False, linecache.lazycache('<foo>', globals()))
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def test_lazycache_already_cached(self):
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linecache.clearcache()
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lines = linecache.getlines(NONEXISTENT_FILENAME, globals())
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self.assertEqual(
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False,
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linecache.lazycache(NONEXISTENT_FILENAME, globals()))
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self.assertEqual(4, len(linecache.cache[NONEXISTENT_FILENAME]))
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def test_memoryerror(self):
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lines = linecache.getlines(FILENAME)
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self.assertTrue(lines)
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def raise_memoryerror(*args, **kwargs):
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raise MemoryError
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with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
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lines2 = linecache.getlines(FILENAME)
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self.assertEqual(lines2, lines)
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linecache.clearcache()
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with support.swap_attr(linecache, 'updatecache', raise_memoryerror):
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lines3 = linecache.getlines(FILENAME)
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self.assertEqual(lines3, [])
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self.assertEqual(linecache.getlines(FILENAME), lines)
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def test_loader(self):
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filename = 'scheme://path'
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for loader in (None, object(), NoSourceLoader()):
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linecache.clearcache()
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module_globals = {'__name__': 'a.b.c', '__loader__': loader}
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self.assertEqual(linecache.getlines(filename, module_globals), [])
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linecache.clearcache()
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module_globals = {'__name__': 'a.b.c', '__loader__': FakeLoader()}
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self.assertEqual(linecache.getlines(filename, module_globals),
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['source for a.b.c\n'])
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for spec in (None, object(), ModuleSpec('', FakeLoader())):
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linecache.clearcache()
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module_globals = {'__name__': 'a.b.c', '__loader__': FakeLoader(),
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'__spec__': spec}
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self.assertEqual(linecache.getlines(filename, module_globals),
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['source for a.b.c\n'])
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linecache.clearcache()
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spec = ModuleSpec('x.y.z', FakeLoader())
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module_globals = {'__name__': 'a.b.c', '__loader__': spec.loader,
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'__spec__': spec}
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self.assertEqual(linecache.getlines(filename, module_globals),
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['source for x.y.z\n'])
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class LineCacheInvalidationTests(unittest.TestCase):
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def setUp(self):
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super().setUp()
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linecache.clearcache()
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self.deleted_file = os_helper.TESTFN + '.1'
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self.modified_file = os_helper.TESTFN + '.2'
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self.unchanged_file = os_helper.TESTFN + '.3'
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for fname in (self.deleted_file,
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self.modified_file,
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self.unchanged_file):
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self.addCleanup(os_helper.unlink, fname)
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with open(fname, 'w', encoding='utf-8') as source:
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source.write(f'print("I am {fname}")')
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self.assertNotIn(fname, linecache.cache)
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linecache.getlines(fname)
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self.assertIn(fname, linecache.cache)
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os.remove(self.deleted_file)
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with open(self.modified_file, 'w', encoding='utf-8') as source:
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source.write('print("was modified")')
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def test_checkcache_for_deleted_file(self):
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linecache.checkcache(self.deleted_file)
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self.assertNotIn(self.deleted_file, linecache.cache)
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self.assertIn(self.modified_file, linecache.cache)
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self.assertIn(self.unchanged_file, linecache.cache)
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def test_checkcache_for_modified_file(self):
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linecache.checkcache(self.modified_file)
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self.assertIn(self.deleted_file, linecache.cache)
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self.assertNotIn(self.modified_file, linecache.cache)
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self.assertIn(self.unchanged_file, linecache.cache)
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def test_checkcache_with_no_parameter(self):
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linecache.checkcache()
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self.assertNotIn(self.deleted_file, linecache.cache)
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self.assertNotIn(self.modified_file, linecache.cache)
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self.assertIn(self.unchanged_file, linecache.cache)
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if __name__ == "__main__":
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unittest.main()
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