| """Test suite for 2to3's parser and grammar files. |
| |
| This is the place to add tests for changes to 2to3's grammar, such as those |
| merging the grammars for Python 2 and 3. In addition to specific tests for |
| parts of the grammar we've changed, we also make sure we can parse the |
| test_grammar.py files from both Python 2 and Python 3. |
| """ |
| |
| # Testing imports |
| from . import support |
| from .support import driver |
| from test.support import verbose |
| |
| # Python imports |
| import os |
| import shutil |
| import subprocess |
| import sys |
| import tempfile |
| import unittest |
| import warnings |
| |
| # Local imports |
| from lib2to3.pgen2 import driver as pgen2_driver |
| from lib2to3.pgen2 import tokenize |
| from ..pgen2.parse import ParseError |
| from lib2to3.pygram import python_symbols as syms |
| |
| |
| class TestDriver(support.TestCase): |
| |
| def test_formfeed(self): |
| s = """print 1\n\x0Cprint 2\n""" |
| t = driver.parse_string(s) |
| self.assertEqual(t.children[0].children[0].type, syms.print_stmt) |
| self.assertEqual(t.children[1].children[0].type, syms.print_stmt) |
| |
| |
| class TestPgen2Caching(support.TestCase): |
| def test_load_grammar_from_txt_file(self): |
| pgen2_driver.load_grammar(support.grammar_path, save=False, force=True) |
| |
| def test_load_grammar_from_pickle(self): |
| # Make a copy of the grammar file in a temp directory we are |
| # guaranteed to be able to write to. |
| tmpdir = tempfile.mkdtemp() |
| try: |
| grammar_copy = os.path.join( |
| tmpdir, os.path.basename(support.grammar_path)) |
| shutil.copy(support.grammar_path, grammar_copy) |
| pickle_name = pgen2_driver._generate_pickle_name(grammar_copy) |
| |
| pgen2_driver.load_grammar(grammar_copy, save=True, force=True) |
| self.assertTrue(os.path.exists(pickle_name)) |
| |
| os.unlink(grammar_copy) # Only the pickle remains... |
| pgen2_driver.load_grammar(grammar_copy, save=False, force=False) |
| finally: |
| shutil.rmtree(tmpdir) |
| |
| @unittest.skipIf(sys.executable is None, 'sys.executable required') |
| def test_load_grammar_from_subprocess(self): |
| tmpdir = tempfile.mkdtemp() |
| tmpsubdir = os.path.join(tmpdir, 'subdir') |
| try: |
| os.mkdir(tmpsubdir) |
| grammar_base = os.path.basename(support.grammar_path) |
| grammar_copy = os.path.join(tmpdir, grammar_base) |
| grammar_sub_copy = os.path.join(tmpsubdir, grammar_base) |
| shutil.copy(support.grammar_path, grammar_copy) |
| shutil.copy(support.grammar_path, grammar_sub_copy) |
| pickle_name = pgen2_driver._generate_pickle_name(grammar_copy) |
| pickle_sub_name = pgen2_driver._generate_pickle_name( |
| grammar_sub_copy) |
| self.assertNotEqual(pickle_name, pickle_sub_name) |
| |
| # Generate a pickle file from this process. |
| pgen2_driver.load_grammar(grammar_copy, save=True, force=True) |
| self.assertTrue(os.path.exists(pickle_name)) |
| |
| # Generate a new pickle file in a subprocess with a most likely |
| # different hash randomization seed. |
| sub_env = dict(os.environ) |
| sub_env['PYTHONHASHSEED'] = 'random' |
| subprocess.check_call( |
| [sys.executable, '-c', """ |
| from lib2to3.pgen2 import driver as pgen2_driver |
| pgen2_driver.load_grammar(%r, save=True, force=True) |
| """ % (grammar_sub_copy,)], |
| env=sub_env) |
| self.assertTrue(os.path.exists(pickle_sub_name)) |
| |
| with open(pickle_name, 'rb') as pickle_f_1, \ |
| open(pickle_sub_name, 'rb') as pickle_f_2: |
| self.assertEqual( |
| pickle_f_1.read(), pickle_f_2.read(), |
| msg='Grammar caches generated using different hash seeds' |
| ' were not identical.') |
| finally: |
| shutil.rmtree(tmpdir) |
| |
| |
| |
| class GrammarTest(support.TestCase): |
| def validate(self, code): |
| support.parse_string(code) |
| |
| def invalid_syntax(self, code): |
| try: |
| self.validate(code) |
| except ParseError: |
| pass |
| else: |
| raise AssertionError("Syntax shouldn't have been valid") |
| |
| |
| class TestMatrixMultiplication(GrammarTest): |
| def test_matrix_multiplication_operator(self): |
| self.validate("a @ b") |
| self.validate("a @= b") |
| |
| |
| class TestYieldFrom(GrammarTest): |
| def test_yield_from(self): |
| self.validate("yield from x") |
| self.validate("(yield from x) + y") |
| self.invalid_syntax("yield from") |
| |
| |
| class TestAsyncAwait(GrammarTest): |
| def test_await_expr(self): |
| self.validate("""async def foo(): |
| await x |
| """) |
| |
| self.validate("""async def foo(): |
| [i async for i in b] |
| """) |
| |
| self.validate("""async def foo(): |
| {i for i in b |
| async for i in a if await i |
| for b in i} |
| """) |
| |
| self.validate("""async def foo(): |
| [await i for i in b if await c] |
| """) |
| |
| self.validate("""async def foo(): |
| [ i for i in b if c] |
| """) |
| |
| self.validate("""async def foo(): |
| |
| def foo(): pass |
| |
| def foo(): pass |
| |
| await x |
| """) |
| |
| self.validate("""async def foo(): return await a""") |
| |
| self.validate("""def foo(): |
| def foo(): pass |
| async def foo(): await x |
| """) |
| |
| self.invalid_syntax("await x") |
| self.invalid_syntax("""def foo(): |
| await x""") |
| |
| self.invalid_syntax("""def foo(): |
| def foo(): pass |
| async def foo(): pass |
| await x |
| """) |
| |
| def test_async_var(self): |
| self.validate("""async = 1""") |
| self.validate("""await = 1""") |
| self.validate("""def async(): pass""") |
| |
| def test_async_with(self): |
| self.validate("""async def foo(): |
| async for a in b: pass""") |
| |
| self.invalid_syntax("""def foo(): |
| async for a in b: pass""") |
| |
| def test_async_for(self): |
| self.validate("""async def foo(): |
| async with a: pass""") |
| |
| self.invalid_syntax("""def foo(): |
| async with a: pass""") |
| |
| |
| class TestRaiseChanges(GrammarTest): |
| def test_2x_style_1(self): |
| self.validate("raise") |
| |
| def test_2x_style_2(self): |
| self.validate("raise E, V") |
| |
| def test_2x_style_3(self): |
| self.validate("raise E, V, T") |
| |
| def test_2x_style_invalid_1(self): |
| self.invalid_syntax("raise E, V, T, Z") |
| |
| def test_3x_style(self): |
| self.validate("raise E1 from E2") |
| |
| def test_3x_style_invalid_1(self): |
| self.invalid_syntax("raise E, V from E1") |
| |
| def test_3x_style_invalid_2(self): |
| self.invalid_syntax("raise E from E1, E2") |
| |
| def test_3x_style_invalid_3(self): |
| self.invalid_syntax("raise from E1, E2") |
| |
| def test_3x_style_invalid_4(self): |
| self.invalid_syntax("raise E from") |
| |
| |
| # Modelled after Lib/test/test_grammar.py:TokenTests.test_funcdef issue2292 |
| # and Lib/test/text_parser.py test_list_displays, test_set_displays, |
| # test_dict_displays, test_argument_unpacking, ... changes. |
| class TestUnpackingGeneralizations(GrammarTest): |
| def test_mid_positional_star(self): |
| self.validate("""func(1, *(2, 3), 4)""") |
| |
| def test_double_star_dict_literal(self): |
| self.validate("""func(**{'eggs':'scrambled', 'spam':'fried'})""") |
| |
| def test_double_star_dict_literal_after_keywords(self): |
| self.validate("""func(spam='fried', **{'eggs':'scrambled'})""") |
| |
| def test_list_display(self): |
| self.validate("""[*{2}, 3, *[4]]""") |
| |
| def test_set_display(self): |
| self.validate("""{*{2}, 3, *[4]}""") |
| |
| def test_dict_display_1(self): |
| self.validate("""{**{}}""") |
| |
| def test_dict_display_2(self): |
| self.validate("""{**{}, 3:4, **{5:6, 7:8}}""") |
| |
| def test_argument_unpacking_1(self): |
| self.validate("""f(a, *b, *c, d)""") |
| |
| def test_argument_unpacking_2(self): |
| self.validate("""f(**a, **b)""") |
| |
| def test_argument_unpacking_3(self): |
| self.validate("""f(2, *a, *b, **b, **c, **d)""") |
| |
| |
| # Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testFuncdef |
| class TestFunctionAnnotations(GrammarTest): |
| def test_1(self): |
| self.validate("""def f(x) -> list: pass""") |
| |
| def test_2(self): |
| self.validate("""def f(x:int): pass""") |
| |
| def test_3(self): |
| self.validate("""def f(*x:str): pass""") |
| |
| def test_4(self): |
| self.validate("""def f(**x:float): pass""") |
| |
| def test_5(self): |
| self.validate("""def f(x, y:1+2): pass""") |
| |
| def test_6(self): |
| self.validate("""def f(a, (b:1, c:2, d)): pass""") |
| |
| def test_7(self): |
| self.validate("""def f(a, (b:1, c:2, d), e:3=4, f=5, *g:6): pass""") |
| |
| def test_8(self): |
| s = """def f(a, (b:1, c:2, d), e:3=4, f=5, |
| *g:6, h:7, i=8, j:9=10, **k:11) -> 12: pass""" |
| self.validate(s) |
| |
| |
| # Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.test_var_annot |
| class TestVarAnnotations(GrammarTest): |
| def test_1(self): |
| self.validate("var1: int = 5") |
| |
| def test_2(self): |
| self.validate("var2: [int, str]") |
| |
| def test_3(self): |
| self.validate("def f():\n" |
| " st: str = 'Hello'\n" |
| " a.b: int = (1, 2)\n" |
| " return st\n") |
| |
| def test_4(self): |
| self.validate("def fbad():\n" |
| " x: int\n" |
| " print(x)\n") |
| |
| def test_5(self): |
| self.validate("class C:\n" |
| " x: int\n" |
| " s: str = 'attr'\n" |
| " z = 2\n" |
| " def __init__(self, x):\n" |
| " self.x: int = x\n") |
| |
| def test_6(self): |
| self.validate("lst: List[int] = []") |
| |
| class TestExcept(GrammarTest): |
| def test_new(self): |
| s = """ |
| try: |
| x |
| except E as N: |
| y""" |
| self.validate(s) |
| |
| def test_old(self): |
| s = """ |
| try: |
| x |
| except E, N: |
| y""" |
| self.validate(s) |
| |
| |
| # Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testAtoms |
| class TestSetLiteral(GrammarTest): |
| def test_1(self): |
| self.validate("""x = {'one'}""") |
| |
| def test_2(self): |
| self.validate("""x = {'one', 1,}""") |
| |
| def test_3(self): |
| self.validate("""x = {'one', 'two', 'three'}""") |
| |
| def test_4(self): |
| self.validate("""x = {2, 3, 4,}""") |
| |
| |
| class TestNumericLiterals(GrammarTest): |
| def test_new_octal_notation(self): |
| self.validate("""0o7777777777777""") |
| self.invalid_syntax("""0o7324528887""") |
| |
| def test_new_binary_notation(self): |
| self.validate("""0b101010""") |
| self.invalid_syntax("""0b0101021""") |
| |
| |
| class TestClassDef(GrammarTest): |
| def test_new_syntax(self): |
| self.validate("class B(t=7): pass") |
| self.validate("class B(t, *args): pass") |
| self.validate("class B(t, **kwargs): pass") |
| self.validate("class B(t, *args, **kwargs): pass") |
| self.validate("class B(t, y=9, *args, **kwargs): pass") |
| |
| |
| class TestParserIdempotency(support.TestCase): |
| |
| """A cut-down version of pytree_idempotency.py.""" |
| |
| # Issue 13125 |
| @unittest.expectedFailure |
| def test_all_project_files(self): |
| for filepath in support.all_project_files(): |
| with open(filepath, "rb") as fp: |
| encoding = tokenize.detect_encoding(fp.readline)[0] |
| self.assertIsNotNone(encoding, |
| "can't detect encoding for %s" % filepath) |
| with open(filepath, "r", encoding=encoding) as fp: |
| source = fp.read() |
| try: |
| tree = driver.parse_string(source) |
| except ParseError as err: |
| if verbose > 0: |
| warnings.warn('ParseError on file %s (%s)' % (filepath, err)) |
| continue |
| new = str(tree) |
| x = diff(filepath, new) |
| if x: |
| self.fail("Idempotency failed: %s" % filepath) |
| |
| def test_extended_unpacking(self): |
| driver.parse_string("a, *b, c = x\n") |
| driver.parse_string("[*a, b] = x\n") |
| driver.parse_string("(z, *y, w) = m\n") |
| driver.parse_string("for *z, m in d: pass\n") |
| |
| |
| class TestLiterals(GrammarTest): |
| |
| def validate(self, s): |
| driver.parse_string(support.dedent(s) + "\n\n") |
| |
| def test_multiline_bytes_literals(self): |
| s = """ |
| md5test(b"\xaa" * 80, |
| (b"Test Using Larger Than Block-Size Key " |
| b"and Larger Than One Block-Size Data"), |
| "6f630fad67cda0ee1fb1f562db3aa53e") |
| """ |
| self.validate(s) |
| |
| def test_multiline_bytes_tripquote_literals(self): |
| s = ''' |
| b""" |
| <?xml version="1.0" encoding="UTF-8"?> |
| <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"> |
| """ |
| ''' |
| self.validate(s) |
| |
| def test_multiline_str_literals(self): |
| s = """ |
| md5test("\xaa" * 80, |
| ("Test Using Larger Than Block-Size Key " |
| "and Larger Than One Block-Size Data"), |
| "6f630fad67cda0ee1fb1f562db3aa53e") |
| """ |
| self.validate(s) |
| |
| |
| def diff(fn, result): |
| try: |
| with open('@', 'w') as f: |
| f.write(str(result)) |
| fn = fn.replace('"', '\\"') |
| return subprocess.call(['diff', '-u', fn, '@'], stdout=(subprocess.DEVNULL if verbose < 1 else None)) |
| finally: |
| try: |
| os.remove("@") |
| except OSError: |
| pass |