mirror of
https://github.com/davidhalter/parso.git
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288 lines
8.1 KiB
Python
288 lines
8.1 KiB
Python
"""Test suite for 2to3's parser and grammar files.
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This is the place to add tests for changes to 2to3's grammar, such as those
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merging the grammars for Python 2 and 3. In addition to specific tests for
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parts of the grammar we've changed, we also make sure we can parse the
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test_grammar.py files from both Python 2 and Python 3.
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"""
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from textwrap import dedent
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import pytest
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from parso import load_grammar
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from parso import ParserSyntaxError
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from parso.pgen2.pgen import generate_grammar
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from parso.python import tokenize
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def _parse(code, version=None):
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code = dedent(code) + "\n\n"
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grammar = load_grammar(version=version)
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return grammar.parse(code, error_recovery=False)
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def _invalid_syntax(code, version=None, **kwargs):
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with pytest.raises(ParserSyntaxError):
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module = _parse(code, version=version, **kwargs)
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# For debugging
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print(module.children)
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def test_formfeed(each_py2_version):
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s = u"""print 1\n\x0Cprint 2\n"""
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t = _parse(s, each_py2_version)
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assert t.children[0].children[0].type == 'print_stmt'
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assert t.children[1].children[0].type == 'print_stmt'
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s = u"""1\n\x0C\x0C2\n"""
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t = _parse(s, each_py2_version)
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def test_matrix_multiplication_operator(works_ge_py35):
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works_ge_py35.parse("a @ b")
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works_ge_py35.parse("a @= b")
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def test_yield_from(works_ge_py3, each_version):
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works_ge_py3.parse("yield from x")
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works_ge_py3.parse("(yield from x) + y")
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_invalid_syntax("yield from", each_version)
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def test_await_expr(works_ge_py35):
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works_ge_py35.parse("""async def foo():
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await x
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""")
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works_ge_py35.parse("""async def foo():
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def foo(): pass
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def foo(): pass
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await x
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""")
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works_ge_py35.parse("""async def foo(): return await a""")
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works_ge_py35.parse("""def foo():
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def foo(): pass
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async def foo(): await x
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""")
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@pytest.mark.skipif('sys.version_info[:2] < (3, 5)')
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@pytest.mark.xfail(reason="acting like python 3.7")
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def test_async_var():
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_parse("""async = 1""", "3.5")
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_parse("""await = 1""", "3.5")
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_parse("""def async(): pass""", "3.5")
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def test_async_for(works_ge_py35):
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works_ge_py35.parse("async def foo():\n async for a in b: pass")
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def test_async_with(works_ge_py35):
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works_ge_py35.parse("async def foo():\n async with a: pass")
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@pytest.mark.skipif('sys.version_info[:2] < (3, 5)')
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@pytest.mark.xfail(reason="acting like python 3.7")
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def test_async_with_invalid():
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_invalid_syntax("""def foo():
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async with a: pass""", version="3.5")
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def test_raise_3x_style_1(each_version):
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_parse("raise", each_version)
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def test_raise_2x_style_2(works_in_py2):
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works_in_py2.parse("raise E, V")
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def test_raise_2x_style_3(works_in_py2):
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works_in_py2.parse("raise E, V, T")
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def test_raise_2x_style_invalid_1(each_version):
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_invalid_syntax("raise E, V, T, Z", version=each_version)
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def test_raise_3x_style(works_ge_py3):
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works_ge_py3.parse("raise E1 from E2")
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def test_raise_3x_style_invalid_1(each_version):
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_invalid_syntax("raise E, V from E1", each_version)
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def test_raise_3x_style_invalid_2(each_version):
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_invalid_syntax("raise E from E1, E2", each_version)
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def test_raise_3x_style_invalid_3(each_version):
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_invalid_syntax("raise from E1, E2", each_version)
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def test_raise_3x_style_invalid_4(each_version):
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_invalid_syntax("raise E from", each_version)
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# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testFuncdef
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def test_annotation_1(works_ge_py3):
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works_ge_py3.parse("""def f(x) -> list: pass""")
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def test_annotation_2(works_ge_py3):
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works_ge_py3.parse("""def f(x:int): pass""")
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def test_annotation_3(works_ge_py3):
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works_ge_py3.parse("""def f(*x:str): pass""")
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def test_annotation_4(works_ge_py3):
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works_ge_py3.parse("""def f(**x:float): pass""")
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def test_annotation_5(works_ge_py3):
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works_ge_py3.parse("""def f(x, y:1+2): pass""")
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def test_annotation_6(each_py3_version):
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_invalid_syntax("""def f(a, (b:1, c:2, d)): pass""", each_py3_version)
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def test_annotation_7(each_py3_version):
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_invalid_syntax("""def f(a, (b:1, c:2, d), e:3=4, f=5, *g:6): pass""", each_py3_version)
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def test_annotation_8(each_py3_version):
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s = """def f(a, (b:1, c:2, d), e:3=4, f=5,
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*g:6, h:7, i=8, j:9=10, **k:11) -> 12: pass"""
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_invalid_syntax(s, each_py3_version)
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def test_except_new(each_version):
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s = dedent("""
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try:
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x
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except E as N:
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y""")
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_parse(s, each_version)
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def test_except_old(works_in_py2):
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s = dedent("""
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try:
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x
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except E, N:
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y""")
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works_in_py2.parse(s)
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# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testAtoms
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def test_set_literal_1(works_ge_py27):
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works_ge_py27.parse("""x = {'one'}""")
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def test_set_literal_2(works_ge_py27):
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works_ge_py27.parse("""x = {'one', 1,}""")
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def test_set_literal_3(works_ge_py27):
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works_ge_py27.parse("""x = {'one', 'two', 'three'}""")
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def test_set_literal_4(works_ge_py27):
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works_ge_py27.parse("""x = {2, 3, 4,}""")
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def test_new_octal_notation(each_version):
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_parse("""0o7777777777777""", each_version)
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_invalid_syntax("""0o7324528887""", each_version)
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def test_old_octal_notation(works_in_py2):
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works_in_py2.parse("07")
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def test_new_binary_notation(each_version):
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_parse("""0b101010""", each_version)
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_invalid_syntax("""0b0101021""", each_version)
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def test_class_new_syntax(works_ge_py3):
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works_ge_py3.parse("class B(t=7): pass")
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works_ge_py3.parse("class B(t, *args): pass")
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works_ge_py3.parse("class B(t, **kwargs): pass")
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works_ge_py3.parse("class B(t, *args, **kwargs): pass")
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works_ge_py3.parse("class B(t, y=9, *args, **kwargs): pass")
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def test_parser_idempotency_extended_unpacking(works_ge_py3):
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"""A cut-down version of pytree_idempotency.py."""
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works_ge_py3.parse("a, *b, c = x\n")
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works_ge_py3.parse("[*a, b] = x\n")
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works_ge_py3.parse("(z, *y, w) = m\n")
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works_ge_py3.parse("for *z, m in d: pass\n")
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def test_multiline_bytes_literals(each_version):
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"""
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It's not possible to get the same result when using \xaa in Python 2/3,
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because it's treated differently.
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"""
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s = u"""
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md5test(b"\xaa" * 80,
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(b"Test Using Larger Than Block-Size Key "
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b"and Larger Than One Block-Size Data"),
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"6f630fad67cda0ee1fb1f562db3aa53e")
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"""
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_parse(s, each_version)
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def test_multiline_bytes_tripquote_literals(each_version):
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s = '''
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b"""
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN">
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"""
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'''
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_parse(s, each_version)
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def test_ellipsis(works_ge_py3, each_version):
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works_ge_py3.parse("...")
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_parse("[0][...]", version=each_version)
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def test_dict_unpacking(works_ge_py35):
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works_ge_py35.parse("{**dict(a=3), foo:2}")
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def test_multiline_str_literals(each_version):
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s = u"""
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md5test("\xaa" * 80,
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("Test Using Larger Than Block-Size Key "
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"and Larger Than One Block-Size Data"),
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"6f630fad67cda0ee1fb1f562db3aa53e")
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"""
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_parse(s, each_version)
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def test_py2_backticks(works_in_py2):
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works_in_py2.parse("`1`")
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def test_py2_string_prefixes(works_in_py2):
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works_in_py2.parse("ur'1'")
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works_in_py2.parse("Ur'1'")
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works_in_py2.parse("UR'1'")
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_invalid_syntax("ru'1'", works_in_py2.version)
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def py_br(each_version):
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_parse('br""', each_version)
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def test_py3_rb(works_ge_py3):
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works_ge_py3.parse("rb'1'")
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works_ge_py3.parse("RB'1'")
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def test_left_recursion():
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with pytest.raises(ValueError, match='left recursion'):
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generate_grammar('foo: foo NAME\n', tokenize.PythonTokenTypes)
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def test_ambiguities():
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with pytest.raises(ValueError, match='ambiguous'):
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generate_grammar('foo: bar | baz\nbar: NAME\nbaz: NAME\n', tokenize.PythonTokenTypes)
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with pytest.raises(ValueError, match='ambiguous'):
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generate_grammar('''foo: bar | baz\nbar: 'x'\nbaz: "x"\n''', tokenize.PythonTokenTypes)
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