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3122 lines (2775 loc) · 107 KB
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# Argument Clinic
# Copyright 2012-2013 by Larry Hastings.
# Licensed to the PSF under a contributor agreement.
from test import support, test_tools
from test.support import os_helper
from test.support.os_helper import TESTFN, unlink
from textwrap import dedent
from unittest import TestCase
import collections
import contextlib
import inspect
import os.path
import re
import sys
import unittest
test_tools.skip_if_missing('clinic')
with test_tools.imports_under_tool('clinic'):
import clinic
from clinic import DSLParser
def _expect_failure(tc, parser, code, errmsg, *, filename=None, lineno=None):
"""Helper for the parser tests.
tc: unittest.TestCase; passed self in the wrapper
parser: the clinic parser used for this test case
code: a str with input text (clinic code)
errmsg: the expected error message
filename: str, optional filename
lineno: int, optional line number
"""
code = dedent(code).strip()
errmsg = re.escape(errmsg)
with tc.assertRaisesRegex(clinic.ClinicError, errmsg) as cm:
parser(code)
if filename is not None:
tc.assertEqual(cm.exception.filename, filename)
if lineno is not None:
tc.assertEqual(cm.exception.lineno, lineno)
class FakeConverter:
def __init__(self, name, args):
self.name = name
self.args = args
class FakeConverterFactory:
def __init__(self, name):
self.name = name
def __call__(self, name, default, **kwargs):
return FakeConverter(self.name, kwargs)
class FakeConvertersDict:
def __init__(self):
self.used_converters = {}
def get(self, name, default):
return self.used_converters.setdefault(name, FakeConverterFactory(name))
c = clinic.Clinic(language='C', filename = "file")
class FakeClinic:
def __init__(self):
self.converters = FakeConvertersDict()
self.legacy_converters = FakeConvertersDict()
self.language = clinic.CLanguage(None)
self.filename = "clinic_tests"
self.destination_buffers = {}
self.block_parser = clinic.BlockParser('', self.language)
self.modules = collections.OrderedDict()
self.classes = collections.OrderedDict()
clinic.clinic = self
self.name = "FakeClinic"
self.line_prefix = self.line_suffix = ''
self.destinations = {}
self.add_destination("block", "buffer")
self.add_destination("file", "buffer")
self.add_destination("suppress", "suppress")
d = self.destinations.get
self.field_destinations = collections.OrderedDict((
('docstring_prototype', d('suppress')),
('docstring_definition', d('block')),
('methoddef_define', d('block')),
('impl_prototype', d('block')),
('parser_prototype', d('suppress')),
('parser_definition', d('block')),
('impl_definition', d('block')),
))
self.functions = []
def get_destination(self, name):
d = self.destinations.get(name)
if not d:
sys.exit("Destination does not exist: " + repr(name))
return d
def add_destination(self, name, type, *args):
if name in self.destinations:
sys.exit("Destination already exists: " + repr(name))
self.destinations[name] = clinic.Destination(name, type, self, *args)
def is_directive(self, name):
return name == "module"
def directive(self, name, args):
self.called_directives[name] = args
_module_and_class = clinic.Clinic._module_and_class
def __repr__(self):
return "<FakeClinic object>"
class ClinicWholeFileTest(TestCase):
maxDiff = None
def expect_failure(self, raw, errmsg, *, filename=None, lineno=None):
_expect_failure(self, self.clinic.parse, raw, errmsg,
filename=filename, lineno=lineno)
def setUp(self):
self.clinic = clinic.Clinic(clinic.CLanguage(None), filename="test.c")
def test_eol(self):
# regression test:
# clinic's block parser didn't recognize
# the "end line" for the block if it
# didn't end in "\n" (as in, the last)
# byte of the file was '/'.
# so it would spit out an end line for you.
# and since you really already had one,
# the last line of the block got corrupted.
raw = "/*[clinic]\nfoo\n[clinic]*/"
cooked = self.clinic.parse(raw).splitlines()
end_line = cooked[2].rstrip()
# this test is redundant, it's just here explicitly to catch
# the regression test so we don't forget what it looked like
self.assertNotEqual(end_line, "[clinic]*/[clinic]*/")
self.assertEqual(end_line, "[clinic]*/")
def test_mangled_marker_line(self):
raw = """
/*[clinic input]
[clinic start generated code]*/
/*[clinic end generated code: foo]*/
"""
err = (
"Mangled Argument Clinic marker line: "
"'/*[clinic end generated code: foo]*/'"
)
self.expect_failure(raw, err, filename="test.c", lineno=3)
def test_checksum_mismatch(self):
raw = """
/*[clinic input]
[clinic start generated code]*/
/*[clinic end generated code: output=0123456789abcdef input=fedcba9876543210]*/
"""
err = ("Checksum mismatch! "
"Expected '0123456789abcdef', computed 'da39a3ee5e6b4b0d'")
self.expect_failure(raw, err, filename="test.c", lineno=3)
def test_garbage_after_stop_line(self):
raw = """
/*[clinic input]
[clinic start generated code]*/foobarfoobar!
"""
err = "Garbage after stop line: 'foobarfoobar!'"
self.expect_failure(raw, err, filename="test.c", lineno=2)
def test_whitespace_before_stop_line(self):
raw = """
/*[clinic input]
[clinic start generated code]*/
"""
err = (
"Whitespace is not allowed before the stop line: "
"' [clinic start generated code]*/'"
)
self.expect_failure(raw, err, filename="test.c", lineno=2)
def test_parse_with_body_prefix(self):
clang = clinic.CLanguage(None)
clang.body_prefix = "//"
clang.start_line = "//[{dsl_name} start]"
clang.stop_line = "//[{dsl_name} stop]"
cl = clinic.Clinic(clang, filename="test.c")
raw = dedent("""
//[clinic start]
//module test
//[clinic stop]
""").strip()
out = cl.parse(raw)
expected = dedent("""
//[clinic start]
//module test
//
//[clinic stop]
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=65fab8adff58cf08]*/
""").lstrip() # Note, lstrip() because of the newline
self.assertEqual(out, expected)
def test_cpp_monitor_fail_nested_block_comment(self):
raw = """
/* start
/* nested
*/
*/
"""
err = 'Nested block comment!'
self.expect_failure(raw, err, filename="test.c", lineno=2)
def test_cpp_monitor_fail_invalid_format_noarg(self):
raw = """
#if
a()
#endif
"""
err = 'Invalid format for #if line: no argument!'
self.expect_failure(raw, err, filename="test.c", lineno=1)
def test_cpp_monitor_fail_invalid_format_toomanyargs(self):
raw = """
#ifdef A B
a()
#endif
"""
err = 'Invalid format for #ifdef line: should be exactly one argument!'
self.expect_failure(raw, err, filename="test.c", lineno=1)
def test_cpp_monitor_fail_no_matching_if(self):
raw = '#else'
err = '#else without matching #if / #ifdef / #ifndef!'
self.expect_failure(raw, err, filename="test.c", lineno=1)
def test_directive_output_unknown_preset(self):
raw = """
/*[clinic input]
output preset nosuchpreset
[clinic start generated code]*/
"""
err = "Unknown preset 'nosuchpreset'"
self.expect_failure(raw, err)
def test_directive_output_cant_pop(self):
raw = """
/*[clinic input]
output pop
[clinic start generated code]*/
"""
err = "Can't 'output pop', stack is empty"
self.expect_failure(raw, err)
def test_directive_output_print(self):
raw = dedent("""
/*[clinic input]
output print 'I told you once.'
[clinic start generated code]*/
""")
out = self.clinic.parse(raw)
# The generated output will differ for every run, but we can check that
# it starts with the clinic block, we check that it contains all the
# expected fields, and we check that it contains the checksum line.
self.assertTrue(out.startswith(dedent("""
/*[clinic input]
output print 'I told you once.'
[clinic start generated code]*/
""")))
fields = {
"cpp_endif",
"cpp_if",
"docstring_definition",
"docstring_prototype",
"impl_definition",
"impl_prototype",
"methoddef_define",
"methoddef_ifndef",
"parser_definition",
"parser_prototype",
}
for field in fields:
with self.subTest(field=field):
self.assertIn(field, out)
last_line = out.rstrip().split("\n")[-1]
self.assertTrue(
last_line.startswith("/*[clinic end generated code: output=")
)
def test_unknown_destination_command(self):
raw = """
/*[clinic input]
destination buffer nosuchcommand
[clinic start generated code]*/
"""
err = "unknown destination command 'nosuchcommand'"
self.expect_failure(raw, err)
def test_no_access_to_members_in_converter_init(self):
raw = """
/*[python input]
class Custom_converter(CConverter):
converter = "some_c_function"
def converter_init(self):
self.function.noaccess
[python start generated code]*/
/*[clinic input]
module test
test.fn
a: Custom
[clinic start generated code]*/
"""
err = (
"accessing self.function inside converter_init is disallowed!"
)
self.expect_failure(raw, err)
@staticmethod
@contextlib.contextmanager
def _clinic_version(new_version):
"""Helper for test_version_*() tests"""
_saved = clinic.version
clinic.version = new_version
try:
yield
finally:
clinic.version = _saved
def test_version_directive(self):
dataset = (
# (clinic version, required version)
('3', '2'), # required version < clinic version
('3.1', '3.0'), # required version < clinic version
('1.2b0', '1.2a7'), # required version < clinic version
('5', '5'), # required version == clinic version
('6.1', '6.1'), # required version == clinic version
('1.2b3', '1.2b3'), # required version == clinic version
)
for clinic_version, required_version in dataset:
with self.subTest(clinic_version=clinic_version,
required_version=required_version):
with self._clinic_version(clinic_version):
block = dedent(f"""
/*[clinic input]
version {required_version}
[clinic start generated code]*/
""")
self.clinic.parse(block)
def test_version_directive_insufficient_version(self):
with self._clinic_version('4'):
err = (
"Insufficient Clinic version!\n"
" Version: 4\n"
" Required: 5"
)
block = """
/*[clinic input]
version 5
[clinic start generated code]*/
"""
self.expect_failure(block, err)
def test_version_directive_illegal_char(self):
err = "Illegal character 'v' in version string 'v5'"
block = """
/*[clinic input]
version v5
[clinic start generated code]*/
"""
self.expect_failure(block, err)
def test_version_directive_unsupported_string(self):
err = "Unsupported version string: '.-'"
block = """
/*[clinic input]
version .-
[clinic start generated code]*/
"""
self.expect_failure(block, err)
def test_clone_mismatch(self):
err = "'kind' of function and cloned function don't match!"
block = """
/*[clinic input]
module m
@classmethod
m.f1
a: object
[clinic start generated code]*/
/*[clinic input]
@staticmethod
m.f2 = m.f1
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=9)
def test_badly_formed_return_annotation(self):
err = "Badly formed annotation for 'm.f': 'Custom'"
block = """
/*[python input]
class Custom_return_converter(CReturnConverter):
def __init__(self):
raise ValueError("abc")
[python start generated code]*/
/*[clinic input]
module m
m.f -> Custom
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=8)
def test_module_already_got_one(self):
err = "Already defined module 'm'!"
block = """
/*[clinic input]
module m
module m
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=3)
def test_destination_already_got_one(self):
err = "Destination already exists: 'test'"
block = """
/*[clinic input]
destination test new buffer
destination test new buffer
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=3)
def test_destination_does_not_exist(self):
err = "Destination does not exist: '/dev/null'"
block = """
/*[clinic input]
output everything /dev/null
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=2)
def test_class_already_got_one(self):
err = "Already defined class 'C'!"
block = """
/*[clinic input]
class C "" ""
class C "" ""
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=3)
def test_cant_nest_module_inside_class(self):
err = "Can't nest a module inside a class!"
block = """
/*[clinic input]
class C "" ""
module C.m
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=3)
def test_dest_buffer_not_empty_at_eof(self):
expected_warning = ("Destination buffer 'buffer' not empty at "
"end of file, emptying.")
expected_generated = dedent("""
/*[clinic input]
output everything buffer
fn
a: object
/
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=1c4668687f5fd002]*/
/*[clinic input]
dump buffer
[clinic start generated code]*/
PyDoc_VAR(fn__doc__);
PyDoc_STRVAR(fn__doc__,
"fn($module, a, /)\\n"
"--\\n"
"\\n");
#define FN_METHODDEF \\
{"fn", (PyCFunction)fn, METH_O, fn__doc__},
static PyObject *
fn(PyObject *module, PyObject *a)
/*[clinic end generated code: output=be6798b148ab4e53 input=524ce2e021e4eba6]*/
""")
block = dedent("""
/*[clinic input]
output everything buffer
fn
a: object
/
[clinic start generated code]*/
""")
with support.captured_stdout() as stdout:
generated = self.clinic.parse(block)
self.assertIn(expected_warning, stdout.getvalue())
self.assertEqual(generated, expected_generated)
def test_dest_clear(self):
err = "Can't clear destination 'file': it's not of type 'buffer'"
block = """
/*[clinic input]
destination file clear
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=2)
def test_directive_set_misuse(self):
err = "unknown variable 'ets'"
block = """
/*[clinic input]
set ets tse
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=2)
def test_directive_set_prefix(self):
block = dedent("""
/*[clinic input]
set line_prefix '// '
output everything suppress
output docstring_prototype buffer
fn
a: object
/
[clinic start generated code]*/
/* We need to dump the buffer.
* If not, Argument Clinic will emit a warning */
/*[clinic input]
dump buffer
[clinic start generated code]*/
""")
generated = self.clinic.parse(block)
expected_docstring_prototype = "// PyDoc_VAR(fn__doc__);"
self.assertIn(expected_docstring_prototype, generated)
def test_directive_set_suffix(self):
block = dedent("""
/*[clinic input]
set line_suffix ' // test'
output everything suppress
output docstring_prototype buffer
fn
a: object
/
[clinic start generated code]*/
/* We need to dump the buffer.
* If not, Argument Clinic will emit a warning */
/*[clinic input]
dump buffer
[clinic start generated code]*/
""")
generated = self.clinic.parse(block)
expected_docstring_prototype = "PyDoc_VAR(fn__doc__); // test"
self.assertIn(expected_docstring_prototype, generated)
def test_directive_set_prefix_and_suffix(self):
block = dedent("""
/*[clinic input]
set line_prefix '{block comment start} '
set line_suffix ' {block comment end}'
output everything suppress
output docstring_prototype buffer
fn
a: object
/
[clinic start generated code]*/
/* We need to dump the buffer.
* If not, Argument Clinic will emit a warning */
/*[clinic input]
dump buffer
[clinic start generated code]*/
""")
generated = self.clinic.parse(block)
expected_docstring_prototype = "/* PyDoc_VAR(fn__doc__); */"
self.assertIn(expected_docstring_prototype, generated)
def test_directive_printout(self):
block = dedent("""
/*[clinic input]
output everything buffer
printout test
[clinic start generated code]*/
""")
expected = dedent("""
/*[clinic input]
output everything buffer
printout test
[clinic start generated code]*/
test
/*[clinic end generated code: output=4e1243bd22c66e76 input=898f1a32965d44ca]*/
""")
generated = self.clinic.parse(block)
self.assertEqual(generated, expected)
def test_directive_preserve_twice(self):
err = "Can't have 'preserve' twice in one block!"
block = """
/*[clinic input]
preserve
preserve
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=3)
def test_directive_preserve_input(self):
err = "'preserve' only works for blocks that don't produce any output!"
block = """
/*[clinic input]
preserve
fn
a: object
/
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=6)
def test_directive_preserve_output(self):
err = "'preserve' only works for blocks that don't produce any output!"
block = dedent("""
/*[clinic input]
output everything buffer
preserve
[clinic start generated code]*/
// Preserve this
/*[clinic end generated code: output=eaa49677ae4c1f7d input=559b5db18fddae6a]*/
/*[clinic input]
dump buffer
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=524ce2e021e4eba6]*/
""")
generated = self.clinic.parse(block)
self.assertEqual(generated, block)
def test_directive_output_invalid_command(self):
err = dedent("""
Invalid command or destination name 'cmd'. Must be one of:
- 'preset'
- 'push'
- 'pop'
- 'print'
- 'everything'
- 'cpp_if'
- 'docstring_prototype'
- 'docstring_definition'
- 'methoddef_define'
- 'impl_prototype'
- 'parser_prototype'
- 'parser_definition'
- 'cpp_endif'
- 'methoddef_ifndef'
- 'impl_definition'
""").strip()
block = """
/*[clinic input]
output cmd buffer
[clinic start generated code]*/
"""
self.expect_failure(block, err, lineno=2)
class ClinicGroupPermuterTest(TestCase):
def _test(self, l, m, r, output):
computed = clinic.permute_optional_groups(l, m, r)
self.assertEqual(output, computed)
def test_range(self):
self._test([['start']], ['stop'], [['step']],
(
('stop',),
('start', 'stop',),
('start', 'stop', 'step',),
))
def test_add_window(self):
self._test([['x', 'y']], ['ch'], [['attr']],
(
('ch',),
('ch', 'attr'),
('x', 'y', 'ch',),
('x', 'y', 'ch', 'attr'),
))
def test_ludicrous(self):
self._test([['a1', 'a2', 'a3'], ['b1', 'b2']], ['c1'], [['d1', 'd2'], ['e1', 'e2', 'e3']],
(
('c1',),
('b1', 'b2', 'c1'),
('b1', 'b2', 'c1', 'd1', 'd2'),
('a1', 'a2', 'a3', 'b1', 'b2', 'c1'),
('a1', 'a2', 'a3', 'b1', 'b2', 'c1', 'd1', 'd2'),
('a1', 'a2', 'a3', 'b1', 'b2', 'c1', 'd1', 'd2', 'e1', 'e2', 'e3'),
))
def test_right_only(self):
self._test([], [], [['a'],['b'],['c']],
(
(),
('a',),
('a', 'b'),
('a', 'b', 'c')
))
def test_have_left_options_but_required_is_empty(self):
def fn():
clinic.permute_optional_groups(['a'], [], [])
self.assertRaises(ValueError, fn)
class ClinicLinearFormatTest(TestCase):
def _test(self, input, output, **kwargs):
computed = clinic.linear_format(input, **kwargs)
self.assertEqual(output, computed)
def test_empty_strings(self):
self._test('', '')
def test_solo_newline(self):
self._test('\n', '\n')
def test_no_substitution(self):
self._test("""
abc
""", """
abc
""")
def test_empty_substitution(self):
self._test("""
abc
{name}
def
""", """
abc
def
""", name='')
def test_single_line_substitution(self):
self._test("""
abc
{name}
def
""", """
abc
GARGLE
def
""", name='GARGLE')
def test_multiline_substitution(self):
self._test("""
abc
{name}
def
""", """
abc
bingle
bungle
def
""", name='bingle\nbungle\n')
class InertParser:
def __init__(self, clinic):
pass
def parse(self, block):
pass
class CopyParser:
def __init__(self, clinic):
pass
def parse(self, block):
block.output = block.input
class ClinicBlockParserTest(TestCase):
def _test(self, input, output):
language = clinic.CLanguage(None)
blocks = list(clinic.BlockParser(input, language))
writer = clinic.BlockPrinter(language)
for block in blocks:
writer.print_block(block)
output = writer.f.getvalue()
assert output == input, "output != input!\n\noutput " + repr(output) + "\n\n input " + repr(input)
def round_trip(self, input):
return self._test(input, input)
def test_round_trip_1(self):
self.round_trip("""
verbatim text here
lah dee dah
""")
def test_round_trip_2(self):
self.round_trip("""
verbatim text here
lah dee dah
/*[inert]
abc
[inert]*/
def
/*[inert checksum: 7b18d017f89f61cf17d47f92749ea6930a3f1deb]*/
xyz
""")
def _test_clinic(self, input, output):
language = clinic.CLanguage(None)
c = clinic.Clinic(language, filename="file")
c.parsers['inert'] = InertParser(c)
c.parsers['copy'] = CopyParser(c)
computed = c.parse(input)
self.assertEqual(output, computed)
def test_clinic_1(self):
self._test_clinic("""
verbatim text here
lah dee dah
/*[copy input]
def
[copy start generated code]*/
abc
/*[copy end generated code: output=03cfd743661f0797 input=7b18d017f89f61cf]*/
xyz
""", """
verbatim text here
lah dee dah
/*[copy input]
def
[copy start generated code]*/
def
/*[copy end generated code: output=7b18d017f89f61cf input=7b18d017f89f61cf]*/
xyz
""")
class ClinicParserTest(TestCase):
def parse(self, text):
c = FakeClinic()
parser = DSLParser(c)
block = clinic.Block(text)
parser.parse(block)
return block
def parse_function(self, text, signatures_in_block=2, function_index=1):
block = self.parse(text)
s = block.signatures
self.assertEqual(len(s), signatures_in_block)
assert isinstance(s[0], clinic.Module)
assert isinstance(s[function_index], clinic.Function)
return s[function_index]
def expect_failure(self, block, err, *, filename=None, lineno=None):
_expect_failure(self, self.parse_function, block, err,
filename=filename, lineno=lineno)
def checkDocstring(self, fn, expected):
self.assertTrue(hasattr(fn, "docstring"))
self.assertEqual(fn.docstring.strip(),
dedent(expected).strip())
def test_trivial(self):
parser = DSLParser(FakeClinic())
block = clinic.Block("""
module os
os.access
""")
parser.parse(block)
module, function = block.signatures
self.assertEqual("access", function.name)
self.assertEqual("os", module.name)
def test_ignore_line(self):
block = self.parse(dedent("""
#
module os
os.access
"""))
module, function = block.signatures
self.assertEqual("access", function.name)
self.assertEqual("os", module.name)
def test_param(self):
function = self.parse_function("""
module os
os.access
path: int
""")
self.assertEqual("access", function.name)
self.assertEqual(2, len(function.parameters))
p = function.parameters['path']
self.assertEqual('path', p.name)
self.assertIsInstance(p.converter, clinic.int_converter)
def test_param_default(self):
function = self.parse_function("""
module os
os.access
follow_symlinks: bool = True
""")
p = function.parameters['follow_symlinks']
self.assertEqual(True, p.default)
def test_param_with_continuations(self):
function = self.parse_function(r"""
module os
os.access
follow_symlinks: \
bool \
= \
True
""")
p = function.parameters['follow_symlinks']
self.assertEqual(True, p.default)
def test_param_default_expr_named_constant(self):
function = self.parse_function("""
module os
os.access
follow_symlinks: int(c_default='MAXSIZE') = sys.maxsize
""")
p = function.parameters['follow_symlinks']
self.assertEqual(sys.maxsize, p.default)
self.assertEqual("MAXSIZE", p.converter.c_default)
err = (
"When you specify a named constant ('sys.maxsize') as your default value, "
"you MUST specify a valid c_default."
)
block = """
module os
os.access
follow_symlinks: int = sys.maxsize
"""
self.expect_failure(block, err, lineno=2)
def test_param_default_expr_binop(self):
err = (
"When you specify an expression ('a + b') as your default value, "
"you MUST specify a valid c_default."
)
block = """
fn
follow_symlinks: int = a + b
"""
self.expect_failure(block, err, lineno=1)
def test_param_no_docstring(self):
function = self.parse_function("""
module os
os.access
follow_symlinks: bool = True
something_else: str = ''
""")
p = function.parameters['follow_symlinks']
self.assertEqual(3, len(function.parameters))
conv = function.parameters['something_else'].converter
self.assertIsInstance(conv, clinic.str_converter)
def test_param_default_parameters_out_of_order(self):
err = (
"Can't have a parameter without a default ('something_else') "
"after a parameter with a default!"
)
block = """
module os
os.access
follow_symlinks: bool = True
something_else: str
"""
self.expect_failure(block, err, lineno=3)
def disabled_test_converter_arguments(self):
function = self.parse_function("""
module os
os.access
path: path_t(allow_fd=1)
""")
p = function.parameters['path']
self.assertEqual(1, p.converter.args['allow_fd'])
def test_function_docstring(self):
function = self.parse_function("""
module os
os.stat as os_stat_fn
path: str
Path to be examined