iframe-proxy | Sunbelt Computer Software

History

115 lines (103 loc) · 4.57 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

import sys

import os.path

import shutil

import unittest

import pytest

import warnings

from tests import test_utils

from semmle.python.parser.dump_ast import old_parser, AstDumper, StdoutLogger

from semmle.python.parser.tsg_parser import parse as new_parser

import subprocess

class ParserTest(unittest.TestCase):

def __init__(self, name):

super(ParserTest, self).__init__(name)

self.test_folder = os.path.join(os.path.dirname(__file__), "parser")

self.maxDiff = None

@pytest.fixture(autouse=True)

def capsys(self, capsys):

self.capsys = capsys

def compare_parses(self, filename, logger):

pyfile = os.path.join(self.test_folder, filename)

stem = filename[:-3]

oldfile = os.path.join(self.test_folder, stem + ".old")

newfile = os.path.join(self.test_folder, stem + ".new")

old_error = False

new_error = False

try:

old_ast = old_parser(pyfile, logger)

with open(oldfile, "w") as old:

AstDumper(old).visit(old_ast)

except SyntaxError:

old_error = True

try:

new_ast = new_parser(pyfile, logger)

with open(newfile, "w") as new:

AstDumper(new).visit(new_ast)

except SyntaxError:

new_error = True

if old_error or new_error:

raise Exception("Parser error: old_error={}, new_error={}".format(old_error, new_error))

try:

diff = subprocess.check_output(["git", "diff", "--patience", "--no-index", oldfile, newfile])

except subprocess.CalledProcessError as e:

diff = e.output

if diff:

pytest.fail(diff.decode("utf-8"))

self.check_for_stdout_errors(logger)

self.assertEqual(self.capsys.readouterr().err, "")

os.remove(oldfile)

os.remove(newfile)

def compare_expected(self, filename, logger, new=True ):

if sys.version_info.major < 3:

return

pyfile = os.path.join(self.test_folder, filename)

stem = filename[:-3]

expected = os.path.join(self.test_folder, stem + ".expected")

actual = os.path.join(self.test_folder, stem + ".actual")

parser = new_parser if new else old_parser

with warnings.catch_warnings():

# The test case `b"this is not a unicode escape because we are in a

# bytestring: \N{AMPERSAND}"`` in strings_new.py gives a DeprecationWarning,

# however we are actually testing the parser behavior on such bad code, so

# we can't just "fix" the code. You would think we could use the Python

# warning filter to ignore this specific warning, but that doesn't work --

# furthermore, using `error::DeprecationWarning` makes the *output* of the

# test change :O

# This was the best solution I could come up with that _both_ allows pytest

# to error on normal deprecation warnings, but also allows this one case to

# exist.

if filename == "strings_new.py":

warnings.simplefilter("ignore", DeprecationWarning)

ast = parser(pyfile, logger)

with open(actual, "w") as actual_file:

AstDumper(actual_file).visit(ast)

try:

diff = subprocess.check_output(["git", "diff", "--patience", "--no-index", expected, actual])

except subprocess.CalledProcessError as e:

diff = e.output

if diff:

pytest.fail(diff.decode("utf-8"))

self.check_for_stdout_errors(logger)

self.assertEqual(self.capsys.readouterr().err, "")

os.remove(actual)

def check_for_stdout_errors(self, logger):

if logger.had_errors():

logger.reset_error_count()

pytest.fail("Errors/warnings were logged to stdout during testing.")

def setup_tests():

test_folder = os.path.join(os.path.dirname(__file__), "parser")

with StdoutLogger() as logger:

for file in os.listdir(test_folder):

if file.endswith(".py"):

stem = file[:-3]

test_name = "test_" + stem

if stem.endswith("_new"):

test_func = lambda self, file=file: self.compare_expected(file, logger, new=True)

elif stem.endswith("_old"):

test_func = lambda self, file=file: self.compare_expected(file, logger, new=False)

else:

test_func = lambda self, file=file: self.compare_parses(file, logger)

setattr(ParserTest, test_name, test_func)

setup_tests()

del setup_tests

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Uh oh!

Sunbelt Computer Software

PL/B Language Development and Support

Uh oh!

FilesExpand file tree

test_parser.py

Latest commit

History

test_parser.py

File metadata and controls