"""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. """ from textwrap import dedent from parso._compatibility import py_version from parso import load_python_grammar from parso import ParserSyntaxError import pytest def parse(code, version='3.4'): code = dedent(code) + "\n\n" grammar = load_python_grammar(version=version) return grammar.parse(code, error_recovery=False) def test_formfeed(): s = """print 1\n\x0Cprint 2\n""" t = parse(s, '2.7') assert t.children[0].children[0].type == 'print_stmt' assert t.children[1].children[0].type == 'print_stmt' s = """1\n\x0C\x0C2\n""" t = parse(s, '2.7') def _invalid_syntax(code, **kwargs): try: parse(code, **kwargs) except ParserSyntaxError: pass else: raise AssertionError("Syntax shouldn't have been valid") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') def test_matrix_multiplication_operator(): parse("a @ b", "3.5") parse("a @= b", "3.5") def test_yield_from(): parse("yield from x") parse("(yield from x) + y") _invalid_syntax("yield from") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') def test_await_expr(): parse("""async def foo(): await x """, "3.5") parse("""async def foo(): def foo(): pass def foo(): pass await x """, "3.5") parse("""async def foo(): return await a""", "3.5") parse("""def foo(): def foo(): pass async def foo(): await x """, "3.5") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') @pytest.mark.xfail(reason="acting like python 3.7") def test_await_expr_invalid(): _invalid_syntax("await x", version="3.5") _invalid_syntax("""def foo(): await x""", version="3.5") _invalid_syntax("""def foo(): def foo(): pass async def foo(): pass await x """, version="3.5") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') @pytest.mark.xfail(reason="acting like python 3.7") def test_async_var(): parse("""async = 1""", "3.5") parse("""await = 1""", "3.5") parse("""def async(): pass""", "3.5") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') def test_async_for(): parse("""async def foo(): async for a in b: pass""", "3.5") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') @pytest.mark.xfail(reason="acting like python 3.7") def test_async_for_invalid(): _invalid_syntax("""def foo(): async for a in b: pass""", version="3.5") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') def test_async_with(): parse("""async def foo(): async with a: pass""", "3.5") @pytest.mark.skipif('sys.version_info[:2] < (3, 5)') @pytest.mark.xfail(reason="acting like python 3.7") def test_async_with_invalid(): _invalid_syntax("""def foo(): async with a: pass""", version="3.5") def test_raise_2x_style_1(): parse("raise") def test_raise_2x_style_2(): parse("raise E, V", version='2.7') def test_raise_2x_style_3(): parse("raise E, V, T", version='2.7') def test_raise_2x_style_invalid_1(): _invalid_syntax("raise E, V, T, Z", version='2.7') def test_raise_3x_style(): parse("raise E1 from E2") def test_raise_3x_style_invalid_1(): _invalid_syntax("raise E, V from E1") def test_raise_3x_style_invalid_2(): _invalid_syntax("raise E from E1, E2") def test_raise_3x_style_invalid_3(): _invalid_syntax("raise from E1, E2") def test_raise_3x_style_invalid_4(): _invalid_syntax("raise E from") # Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testFuncdef def test_annotation_1(): parse("""def f(x) -> list: pass""") def test_annotation_2(): parse("""def f(x:int): pass""") def test_annotation_3(): parse("""def f(*x:str): pass""") def test_annotation_4(): parse("""def f(**x:float): pass""") def test_annotation_5(): parse("""def f(x, y:1+2): pass""") def test_annotation_6(): _invalid_syntax("""def f(a, (b:1, c:2, d)): pass""") def test_annotation_7(): _invalid_syntax("""def f(a, (b:1, c:2, d), e:3=4, f=5, *g:6): pass""") def test_annotation_8(): 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""" _invalid_syntax(s) def test_except_new(): s = """ try: x except E as N: y""" parse(s) def test_except_old(): s = """ try: x except E, N: y""" parse(s, version='2.7') # Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testAtoms def test_set_literal_1(): parse("""x = {'one'}""") def test_set_literal_2(): parse("""x = {'one', 1,}""") def test_set_literal_3(): parse("""x = {'one', 'two', 'three'}""") def test_set_literal_4(): parse("""x = {2, 3, 4,}""") def test_new_octal_notation(): code = """0o7777777777777""" if py_version >= 30: parse(code) else: _invalid_syntax(code) _invalid_syntax("""0o7324528887""") def test_new_binary_notation(): parse("""0b101010""") _invalid_syntax("""0b0101021""") def test_class_new_syntax(): parse("class B(t=7): pass") parse("class B(t, *args): pass") parse("class B(t, **kwargs): pass") parse("class B(t, *args, **kwargs): pass") parse("class B(t, y=9, *args, **kwargs): pass") def test_parser_idempotency_extended_unpacking(): """A cut-down version of pytree_idempotency.py.""" parse("a, *b, c = x\n") parse("[*a, b] = x\n") parse("(z, *y, w) = m\n") parse("for *z, m in d: pass\n") @pytest.mark.skipif('sys.version_info[0] < 3') def test_multiline_bytes_literals(): """ It's not possible to get the same result when using \xaa in Python 2/3, because it's treated differently. """ s = """ md5test(b"\xaa" * 80, (b"Test Using Larger Than Block-Size Key " b"and Larger Than One Block-Size Data"), "6f630fad67cda0ee1fb1f562db3aa53e") """ parse(s) def test_multiline_bytes_tripquote_literals(): s = ''' b""" """ ''' parse(s) @pytest.mark.skipif('sys.version_info[0] < 3') def test_multiline_str_literals(): s = """ md5test("\xaa" * 80, ("Test Using Larger Than Block-Size Key " "and Larger Than One Block-Size Data"), "6f630fad67cda0ee1fb1f562db3aa53e") """ parse(s)