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Current Directory: /opt/cloudlinux/venv/lib/python3.11/site-packages/pyflakes/test
Viewing File: /opt/cloudlinux/venv/lib/python3.11/site-packages/pyflakes/test/test_api.py
""" Tests for L{pyflakes.scripts.pyflakes}. """ import contextlib import io import os import sys import shutil import subprocess import tempfile from pyflakes.checker import PYPY from pyflakes.messages import UnusedImport from pyflakes.reporter import Reporter from pyflakes.api import ( main, check, checkPath, checkRecursive, iterSourceCode, ) from pyflakes.test.harness import TestCase, skipIf def withStderrTo(stderr, f, *args, **kwargs): """ Call C{f} with C{sys.stderr} redirected to C{stderr}. """ (outer, sys.stderr) = (sys.stderr, stderr) try: return f(*args, **kwargs) finally: sys.stderr = outer class Node: """ Mock an AST node. """ def __init__(self, lineno, col_offset=0): self.lineno = lineno self.col_offset = col_offset class SysStreamCapturing: """Context manager capturing sys.stdin, sys.stdout and sys.stderr. The file handles are replaced with a StringIO object. """ def __init__(self, stdin): self._stdin = io.StringIO(stdin or '', newline=os.linesep) def __enter__(self): self._orig_stdin = sys.stdin self._orig_stdout = sys.stdout self._orig_stderr = sys.stderr sys.stdin = self._stdin sys.stdout = self._stdout_stringio = io.StringIO(newline=os.linesep) sys.stderr = self._stderr_stringio = io.StringIO(newline=os.linesep) return self def __exit__(self, *args): self.output = self._stdout_stringio.getvalue() self.error = self._stderr_stringio.getvalue() sys.stdin = self._orig_stdin sys.stdout = self._orig_stdout sys.stderr = self._orig_stderr class LoggingReporter: """ Implementation of Reporter that just appends any error to a list. """ def __init__(self, log): """ Construct a C{LoggingReporter}. @param log: A list to append log messages to. """ self.log = log def flake(self, message): self.log.append(('flake', str(message))) def unexpectedError(self, filename, message): self.log.append(('unexpectedError', filename, message)) def syntaxError(self, filename, msg, lineno, offset, line): self.log.append(('syntaxError', filename, msg, lineno, offset, line)) class TestIterSourceCode(TestCase): """ Tests for L{iterSourceCode}. """ def setUp(self): self.tempdir = tempfile.mkdtemp() def tearDown(self): shutil.rmtree(self.tempdir) def makeEmptyFile(self, *parts): assert parts fpath = os.path.join(self.tempdir, *parts) open(fpath, 'a').close() return fpath def test_emptyDirectory(self): """ There are no Python files in an empty directory. """ self.assertEqual(list(iterSourceCode([self.tempdir])), []) def test_singleFile(self): """ If the directory contains one Python file, C{iterSourceCode} will find it. """ childpath = self.makeEmptyFile('foo.py') self.assertEqual(list(iterSourceCode([self.tempdir])), [childpath]) def test_onlyPythonSource(self): """ Files that are not Python source files are not included. """ self.makeEmptyFile('foo.pyc') self.assertEqual(list(iterSourceCode([self.tempdir])), []) def test_recurses(self): """ If the Python files are hidden deep down in child directories, we will find them. """ os.mkdir(os.path.join(self.tempdir, 'foo')) apath = self.makeEmptyFile('foo', 'a.py') self.makeEmptyFile('foo', 'a.py~') os.mkdir(os.path.join(self.tempdir, 'bar')) bpath = self.makeEmptyFile('bar', 'b.py') cpath = self.makeEmptyFile('c.py') self.assertEqual( sorted(iterSourceCode([self.tempdir])), sorted([apath, bpath, cpath])) def test_shebang(self): """ Find Python files that don't end with `.py`, but contain a Python shebang. """ python = os.path.join(self.tempdir, 'a') with open(python, 'w') as fd: fd.write('#!/usr/bin/env python\n') self.makeEmptyFile('b') with open(os.path.join(self.tempdir, 'c'), 'w') as fd: fd.write('hello\nworld\n') python3 = os.path.join(self.tempdir, 'e') with open(python3, 'w') as fd: fd.write('#!/usr/bin/env python3\n') pythonw = os.path.join(self.tempdir, 'f') with open(pythonw, 'w') as fd: fd.write('#!/usr/bin/env pythonw\n') python3args = os.path.join(self.tempdir, 'g') with open(python3args, 'w') as fd: fd.write('#!/usr/bin/python3 -u\n') python3d = os.path.join(self.tempdir, 'i') with open(python3d, 'w') as fd: fd.write('#!/usr/local/bin/python3d\n') python38m = os.path.join(self.tempdir, 'j') with open(python38m, 'w') as fd: fd.write('#! /usr/bin/env python3.8m\n') # Should NOT be treated as Python source notfirst = os.path.join(self.tempdir, 'l') with open(notfirst, 'w') as fd: fd.write('#!/bin/sh\n#!/usr/bin/python\n') self.assertEqual( sorted(iterSourceCode([self.tempdir])), sorted([ python, python3, pythonw, python3args, python3d, python38m, ])) def test_multipleDirectories(self): """ L{iterSourceCode} can be given multiple directories. It will recurse into each of them. """ foopath = os.path.join(self.tempdir, 'foo') barpath = os.path.join(self.tempdir, 'bar') os.mkdir(foopath) apath = self.makeEmptyFile('foo', 'a.py') os.mkdir(barpath) bpath = self.makeEmptyFile('bar', 'b.py') self.assertEqual( sorted(iterSourceCode([foopath, barpath])), sorted([apath, bpath])) def test_explicitFiles(self): """ If one of the paths given to L{iterSourceCode} is not a directory but a file, it will include that in its output. """ epath = self.makeEmptyFile('e.py') self.assertEqual(list(iterSourceCode([epath])), [epath]) class TestReporter(TestCase): """ Tests for L{Reporter}. """ def test_syntaxError(self): """ C{syntaxError} reports that there was a syntax error in the source file. It reports to the error stream and includes the filename, line number, error message, actual line of source and a caret pointing to where the error is. """ err = io.StringIO() reporter = Reporter(None, err) reporter.syntaxError('foo.py', 'a problem', 3, 8 if sys.version_info >= (3, 8) else 7, 'bad line of source') self.assertEqual( ("foo.py:3:8: a problem\n" "bad line of source\n" " ^\n"), err.getvalue()) def test_syntaxErrorNoOffset(self): """ C{syntaxError} doesn't include a caret pointing to the error if C{offset} is passed as C{None}. """ err = io.StringIO() reporter = Reporter(None, err) reporter.syntaxError('foo.py', 'a problem', 3, None, 'bad line of source') self.assertEqual( ("foo.py:3: a problem\n" "bad line of source\n"), err.getvalue()) def test_syntaxErrorNoText(self): """ C{syntaxError} doesn't include text or nonsensical offsets if C{text} is C{None}. This typically happens when reporting syntax errors from stdin. """ err = io.StringIO() reporter = Reporter(None, err) reporter.syntaxError('<stdin>', 'a problem', 0, 0, None) self.assertEqual(("<stdin>:1:1: a problem\n"), err.getvalue()) def test_multiLineSyntaxError(self): """ If there's a multi-line syntax error, then we only report the last line. The offset is adjusted so that it is relative to the start of the last line. """ err = io.StringIO() lines = [ 'bad line of source', 'more bad lines of source', ] reporter = Reporter(None, err) reporter.syntaxError('foo.py', 'a problem', 3, len(lines[0]) + 7, '\n'.join(lines)) column = 25 if sys.version_info >= (3, 8) else 7 self.assertEqual( ("foo.py:3:%d: a problem\n" % column + lines[-1] + "\n" + " " * (column - 1) + "^\n"), err.getvalue()) def test_unexpectedError(self): """ C{unexpectedError} reports an error processing a source file. """ err = io.StringIO() reporter = Reporter(None, err) reporter.unexpectedError('source.py', 'error message') self.assertEqual('source.py: error message\n', err.getvalue()) def test_flake(self): """ C{flake} reports a code warning from Pyflakes. It is exactly the str() of a L{pyflakes.messages.Message}. """ out = io.StringIO() reporter = Reporter(out, None) message = UnusedImport('foo.py', Node(42), 'bar') reporter.flake(message) self.assertEqual(out.getvalue(), f"{message}\n") class CheckTests(TestCase): """ Tests for L{check} and L{checkPath} which check a file for flakes. """ @contextlib.contextmanager def makeTempFile(self, content): """ Make a temporary file containing C{content} and return a path to it. """ fd, name = tempfile.mkstemp() try: with os.fdopen(fd, 'wb') as f: if not hasattr(content, 'decode'): content = content.encode('ascii') f.write(content) yield name finally: os.remove(name) def assertHasErrors(self, path, errorList): """ Assert that C{path} causes errors. @param path: A path to a file to check. @param errorList: A list of errors expected to be printed to stderr. """ err = io.StringIO() count = withStderrTo(err, checkPath, path) self.assertEqual( (count, err.getvalue()), (len(errorList), ''.join(errorList))) def getErrors(self, path): """ Get any warnings or errors reported by pyflakes for the file at C{path}. @param path: The path to a Python file on disk that pyflakes will check. @return: C{(count, log)}, where C{count} is the number of warnings or errors generated, and log is a list of those warnings, presented as structured data. See L{LoggingReporter} for more details. """ log = [] reporter = LoggingReporter(log) count = checkPath(path, reporter) return count, log def test_legacyScript(self): from pyflakes.scripts import pyflakes as script_pyflakes self.assertIs(script_pyflakes.checkPath, checkPath) def test_missingTrailingNewline(self): """ Source which doesn't end with a newline shouldn't cause any exception to be raised nor an error indicator to be returned by L{check}. """ with self.makeTempFile("def foo():\n\tpass\n\t") as fName: self.assertHasErrors(fName, []) def test_checkPathNonExisting(self): """ L{checkPath} handles non-existing files. """ count, errors = self.getErrors('extremo') self.assertEqual(count, 1) self.assertEqual( errors, [('unexpectedError', 'extremo', 'No such file or directory')]) def test_multilineSyntaxError(self): """ Source which includes a syntax error which results in the raised L{SyntaxError.text} containing multiple lines of source are reported with only the last line of that source. """ source = """\ def foo(): ''' def bar(): pass def baz(): '''quux''' """ # Sanity check - SyntaxError.text should be multiple lines, if it # isn't, something this test was unprepared for has happened. def evaluate(source): exec(source) try: evaluate(source) except SyntaxError as e: if not PYPY and sys.version_info < (3, 10): self.assertTrue(e.text.count('\n') > 1) else: self.fail() with self.makeTempFile(source) as sourcePath: if PYPY: message = 'end of file (EOF) while scanning triple-quoted string literal' elif sys.version_info >= (3, 10): message = 'unterminated triple-quoted string literal (detected at line 8)' # noqa: E501 else: message = 'invalid syntax' if PYPY or sys.version_info >= (3, 10): column = 12 elif sys.version_info >= (3, 8): column = 8 else: column = 11 self.assertHasErrors( sourcePath, ["""\ %s:8:%d: %s '''quux''' %s^ """ % (sourcePath, column, message, ' ' * (column - 1))]) def test_eofSyntaxError(self): """ The error reported for source files which end prematurely causing a syntax error reflects the cause for the syntax error. """ with self.makeTempFile("def foo(") as sourcePath: if PYPY: msg = 'parenthesis is never closed' elif sys.version_info >= (3, 10): msg = "'(' was never closed" else: msg = 'unexpected EOF while parsing' if PYPY or sys.version_info >= (3, 10): column = 8 else: column = 9 spaces = ' ' * (column - 1) expected = '{}:1:{}: {}\ndef foo(\n{}^\n'.format( sourcePath, column, msg, spaces ) self.assertHasErrors(sourcePath, [expected]) def test_eofSyntaxErrorWithTab(self): """ The error reported for source files which end prematurely causing a syntax error reflects the cause for the syntax error. """ with self.makeTempFile("if True:\n\tfoo =") as sourcePath: self.assertHasErrors( sourcePath, [f"""\ {sourcePath}:2:7: invalid syntax \tfoo = \t ^ """]) def test_nonDefaultFollowsDefaultSyntaxError(self): """ Source which has a non-default argument following a default argument should include the line number of the syntax error. However these exceptions do not include an offset. """ source = """\ def foo(bar=baz, bax): pass """ with self.makeTempFile(source) as sourcePath: if PYPY and sys.version_info >= (3, 9): column = 18 elif PYPY: column = 8 elif sys.version_info >= (3, 10): column = 18 elif sys.version_info >= (3, 9): column = 21 elif sys.version_info >= (3, 8): column = 9 else: column = 8 last_line = ' ' * (column - 1) + '^\n' columnstr = '%d:' % column self.assertHasErrors( sourcePath, ["""\ {}:1:{} non-default argument follows default argument def foo(bar=baz, bax): {}""".format(sourcePath, columnstr, last_line)]) def test_nonKeywordAfterKeywordSyntaxError(self): """ Source which has a non-keyword argument after a keyword argument should include the line number of the syntax error. However these exceptions do not include an offset. """ source = """\ foo(bar=baz, bax) """ with self.makeTempFile(source) as sourcePath: if sys.version_info >= (3, 9): column = 17 elif not PYPY and sys.version_info >= (3, 8): column = 14 else: column = 13 last_line = ' ' * (column - 1) + '^\n' columnstr = '%d:' % column message = 'positional argument follows keyword argument' self.assertHasErrors( sourcePath, ["""\ {}:1:{} {} foo(bar=baz, bax) {}""".format(sourcePath, columnstr, message, last_line)]) def test_invalidEscape(self): """ The invalid escape syntax raises ValueError in Python 2 """ # ValueError: invalid \x escape with self.makeTempFile(r"foo = '\xyz'") as sourcePath: position_end = 1 if PYPY and sys.version_info >= (3, 9): column = 7 elif PYPY: column = 6 elif sys.version_info >= (3, 9): column = 13 else: column = 7 last_line = '%s^\n' % (' ' * (column - 1)) decoding_error = """\ %s:1:%d: (unicode error) 'unicodeescape' codec can't decode bytes \ in position 0-%d: truncated \\xXX escape foo = '\\xyz' %s""" % (sourcePath, column, position_end, last_line) self.assertHasErrors( sourcePath, [decoding_error]) @skipIf(sys.platform == 'win32', 'unsupported on Windows') def test_permissionDenied(self): """ If the source file is not readable, this is reported on standard error. """ if os.getuid() == 0: self.skipTest('root user can access all files regardless of ' 'permissions') with self.makeTempFile('') as sourcePath: os.chmod(sourcePath, 0) count, errors = self.getErrors(sourcePath) self.assertEqual(count, 1) self.assertEqual( errors, [('unexpectedError', sourcePath, "Permission denied")]) def test_pyflakesWarning(self): """ If the source file has a pyflakes warning, this is reported as a 'flake'. """ with self.makeTempFile("import foo") as sourcePath: count, errors = self.getErrors(sourcePath) self.assertEqual(count, 1) self.assertEqual( errors, [('flake', str(UnusedImport(sourcePath, Node(1), 'foo')))]) def test_encodedFileUTF8(self): """ If source file declares the correct encoding, no error is reported. """ SNOWMAN = chr(0x2603) source = ("""\ # coding: utf-8 x = "%s" """ % SNOWMAN).encode('utf-8') with self.makeTempFile(source) as sourcePath: self.assertHasErrors(sourcePath, []) def test_CRLFLineEndings(self): """ Source files with Windows CR LF line endings are parsed successfully. """ with self.makeTempFile("x = 42\r\n") as sourcePath: self.assertHasErrors(sourcePath, []) def test_misencodedFileUTF8(self): """ If a source file contains bytes which cannot be decoded, this is reported on stderr. """ SNOWMAN = chr(0x2603) source = ("""\ # coding: ascii x = "%s" """ % SNOWMAN).encode('utf-8') with self.makeTempFile(source) as sourcePath: self.assertHasErrors( sourcePath, [f"{sourcePath}:1:1: 'ascii' codec can't decode byte 0xe2 in position 21: ordinal not in range(128)\n"]) # noqa: E501 def test_misencodedFileUTF16(self): """ If a source file contains bytes which cannot be decoded, this is reported on stderr. """ SNOWMAN = chr(0x2603) source = ("""\ # coding: ascii x = "%s" """ % SNOWMAN).encode('utf-16') with self.makeTempFile(source) as sourcePath: self.assertHasErrors( sourcePath, [f"{sourcePath}: problem decoding source\n"]) def test_checkRecursive(self): """ L{checkRecursive} descends into each directory, finding Python files and reporting problems. """ tempdir = tempfile.mkdtemp() try: os.mkdir(os.path.join(tempdir, 'foo')) file1 = os.path.join(tempdir, 'foo', 'bar.py') with open(file1, 'wb') as fd: fd.write(b"import baz\n") file2 = os.path.join(tempdir, 'baz.py') with open(file2, 'wb') as fd: fd.write(b"import contraband") log = [] reporter = LoggingReporter(log) warnings = checkRecursive([tempdir], reporter) self.assertEqual(warnings, 2) self.assertEqual( sorted(log), sorted([('flake', str(UnusedImport(file1, Node(1), 'baz'))), ('flake', str(UnusedImport(file2, Node(1), 'contraband')))])) finally: shutil.rmtree(tempdir) def test_stdinReportsErrors(self): """ L{check} reports syntax errors from stdin """ source = "max(1 for i in range(10), key=lambda x: x+1)\n" err = io.StringIO() count = withStderrTo(err, check, source, "<stdin>") self.assertEqual(count, 1) errlines = err.getvalue().split("\n")[:-1] if sys.version_info >= (3, 9): expected_error = [ "<stdin>:1:5: Generator expression must be parenthesized", "max(1 for i in range(10), key=lambda x: x+1)", " ^", ] elif PYPY: expected_error = [ "<stdin>:1:4: Generator expression must be parenthesized if not sole argument", # noqa: E501 "max(1 for i in range(10), key=lambda x: x+1)", " ^", ] elif sys.version_info >= (3, 8): expected_error = [ "<stdin>:1:5: Generator expression must be parenthesized", ] elif sys.version_info >= (3, 7): expected_error = [ "<stdin>:1:4: Generator expression must be parenthesized", ] elif sys.version_info >= (3, 6): expected_error = [ "<stdin>:1:4: Generator expression must be parenthesized if not sole argument", # noqa: E501 ] self.assertEqual(errlines, expected_error) class IntegrationTests(TestCase): """ Tests of the pyflakes script that actually spawn the script. """ def setUp(self): self.tempdir = tempfile.mkdtemp() self.tempfilepath = os.path.join(self.tempdir, 'temp') def tearDown(self): shutil.rmtree(self.tempdir) def getPyflakesBinary(self): """ Return the path to the pyflakes binary. """ import pyflakes package_dir = os.path.dirname(pyflakes.__file__) return os.path.join(package_dir, '..', 'bin', 'pyflakes') def runPyflakes(self, paths, stdin=None): """ Launch a subprocess running C{pyflakes}. @param paths: Command-line arguments to pass to pyflakes. @param stdin: Text to use as stdin. @return: C{(returncode, stdout, stderr)} of the completed pyflakes process. """ env = dict(os.environ) env['PYTHONPATH'] = os.pathsep.join(sys.path) command = [sys.executable, self.getPyflakesBinary()] command.extend(paths) if stdin: p = subprocess.Popen(command, env=env, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE) (stdout, stderr) = p.communicate(stdin.encode('ascii')) else: p = subprocess.Popen(command, env=env, stdout=subprocess.PIPE, stderr=subprocess.PIPE) (stdout, stderr) = p.communicate() rv = p.wait() stdout = stdout.decode('utf-8') stderr = stderr.decode('utf-8') return (stdout, stderr, rv) def test_goodFile(self): """ When a Python source file is all good, the return code is zero and no messages are printed to either stdout or stderr. """ open(self.tempfilepath, 'a').close() d = self.runPyflakes([self.tempfilepath]) self.assertEqual(d, ('', '', 0)) def test_fileWithFlakes(self): """ When a Python source file has warnings, the return code is non-zero and the warnings are printed to stdout. """ with open(self.tempfilepath, 'wb') as fd: fd.write(b"import contraband\n") d = self.runPyflakes([self.tempfilepath]) expected = UnusedImport(self.tempfilepath, Node(1), 'contraband') self.assertEqual(d, (f"{expected}{os.linesep}", '', 1)) def test_errors_io(self): """ When pyflakes finds errors with the files it's given, (if they don't exist, say), then the return code is non-zero and the errors are printed to stderr. """ d = self.runPyflakes([self.tempfilepath]) error_msg = '{}: No such file or directory{}'.format(self.tempfilepath, os.linesep) self.assertEqual(d, ('', error_msg, 1)) def test_errors_syntax(self): """ When pyflakes finds errors with the files it's given, (if they don't exist, say), then the return code is non-zero and the errors are printed to stderr. """ with open(self.tempfilepath, 'wb') as fd: fd.write(b"import") d = self.runPyflakes([self.tempfilepath]) error_msg = '{0}:1:7: invalid syntax{1}import{1} ^{1}'.format( self.tempfilepath, os.linesep) self.assertEqual(d, ('', error_msg, 1)) def test_readFromStdin(self): """ If no arguments are passed to C{pyflakes} then it reads from stdin. """ d = self.runPyflakes([], stdin='import contraband') expected = UnusedImport('<stdin>', Node(1), 'contraband') self.assertEqual(d, (f"{expected}{os.linesep}", '', 1)) class TestMain(IntegrationTests): """ Tests of the pyflakes main function. """ def runPyflakes(self, paths, stdin=None): try: with SysStreamCapturing(stdin) as capture: main(args=paths) except SystemExit as e: self.assertIsInstance(e.code, bool) rv = int(e.code) return (capture.output, capture.error, rv) else: raise RuntimeError('SystemExit not raised')