mirror of
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dd1c638b92
between runs given the same Grammar.txt input regardless of the hash randomization setting.
367 lines
11 KiB
Python
367 lines
11 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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# Testing imports
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from . import support
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from .support import driver, test_dir
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from test.support import verbose
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# Python imports
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import os
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import shutil
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import subprocess
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import sys
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import tempfile
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import unittest
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import warnings
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# Local imports
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from lib2to3.pgen2 import driver as pgen2_driver
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from lib2to3.pgen2 import tokenize
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from ..pgen2.parse import ParseError
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from lib2to3.pygram import python_symbols as syms
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class TestDriver(support.TestCase):
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def test_formfeed(self):
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s = """print 1\n\x0Cprint 2\n"""
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t = driver.parse_string(s)
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self.assertEqual(t.children[0].children[0].type, syms.print_stmt)
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self.assertEqual(t.children[1].children[0].type, syms.print_stmt)
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class TestPgen2Caching(support.TestCase):
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def test_load_grammar_from_txt_file(self):
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pgen2_driver.load_grammar(support.grammar_path, save=False, force=True)
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def test_load_grammar_from_pickle(self):
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# Make a copy of the grammar file in a temp directory we are
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# guaranteed to be able to write to.
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tmpdir = tempfile.mkdtemp()
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try:
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grammar_copy = os.path.join(
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tmpdir, os.path.basename(support.grammar_path))
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shutil.copy(support.grammar_path, grammar_copy)
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pickle_name = pgen2_driver._generate_pickle_name(grammar_copy)
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pgen2_driver.load_grammar(grammar_copy, save=True, force=True)
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self.assertTrue(os.path.exists(pickle_name))
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os.unlink(grammar_copy) # Only the pickle remains...
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pgen2_driver.load_grammar(grammar_copy, save=False, force=False)
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finally:
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shutil.rmtree(tmpdir)
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@unittest.skipIf(sys.executable is None, 'sys.executable required')
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def test_load_grammar_from_subprocess(self):
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tmpdir = tempfile.mkdtemp()
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tmpsubdir = os.path.join(tmpdir, 'subdir')
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try:
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os.mkdir(tmpsubdir)
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grammar_base = os.path.basename(support.grammar_path)
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grammar_copy = os.path.join(tmpdir, grammar_base)
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grammar_sub_copy = os.path.join(tmpsubdir, grammar_base)
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shutil.copy(support.grammar_path, grammar_copy)
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shutil.copy(support.grammar_path, grammar_sub_copy)
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pickle_name = pgen2_driver._generate_pickle_name(grammar_copy)
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pickle_sub_name = pgen2_driver._generate_pickle_name(
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grammar_sub_copy)
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self.assertNotEqual(pickle_name, pickle_sub_name)
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# Generate a pickle file from this process.
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pgen2_driver.load_grammar(grammar_copy, save=True, force=True)
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self.assertTrue(os.path.exists(pickle_name))
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# Generate a new pickle file in a subprocess with a most likely
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# different hash randomization seed.
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sub_env = dict(os.environ)
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sub_env['PYTHONHASHSEED'] = 'random'
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subprocess.check_call(
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[sys.executable, '-c', """
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from lib2to3.pgen2 import driver as pgen2_driver
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pgen2_driver.load_grammar(%r, save=True, force=True)
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""" % (grammar_sub_copy,)],
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env=sub_env)
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self.assertTrue(os.path.exists(pickle_sub_name))
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with open(pickle_name, 'rb') as pickle_f_1, \
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open(pickle_sub_name, 'rb') as pickle_f_2:
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self.assertEqual(
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pickle_f_1.read(), pickle_f_2.read(),
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msg='Grammar caches generated using different hash seeds'
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' were not identical.')
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finally:
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shutil.rmtree(tmpdir)
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class GrammarTest(support.TestCase):
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def validate(self, code):
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support.parse_string(code)
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def invalid_syntax(self, code):
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try:
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self.validate(code)
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except ParseError:
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pass
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else:
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raise AssertionError("Syntax shouldn't have been valid")
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class TestMatrixMultiplication(GrammarTest):
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def test_matrix_multiplication_operator(self):
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self.validate("a @ b")
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self.validate("a @= b")
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class TestYieldFrom(GrammarTest):
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def test_yield_from(self):
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self.validate("yield from x")
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self.validate("(yield from x) + y")
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self.invalid_syntax("yield from")
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class TestAsyncAwait(GrammarTest):
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def test_await_expr(self):
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self.validate("""async def foo():
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await x
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""")
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self.validate("""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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self.validate("""async def foo(): return await a""")
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self.validate("""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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self.invalid_syntax("await x")
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self.invalid_syntax("""def foo():
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await x""")
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self.invalid_syntax("""def foo():
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def foo(): pass
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async def foo(): pass
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await x
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""")
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def test_async_var(self):
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self.validate("""async = 1""")
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self.validate("""await = 1""")
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self.validate("""def async(): pass""")
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def test_async_with(self):
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self.validate("""async def foo():
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async for a in b: pass""")
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self.invalid_syntax("""def foo():
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async for a in b: pass""")
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def test_async_for(self):
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self.validate("""async def foo():
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async with a: pass""")
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self.invalid_syntax("""def foo():
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async with a: pass""")
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class TestRaiseChanges(GrammarTest):
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def test_2x_style_1(self):
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self.validate("raise")
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def test_2x_style_2(self):
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self.validate("raise E, V")
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def test_2x_style_3(self):
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self.validate("raise E, V, T")
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def test_2x_style_invalid_1(self):
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self.invalid_syntax("raise E, V, T, Z")
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def test_3x_style(self):
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self.validate("raise E1 from E2")
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def test_3x_style_invalid_1(self):
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self.invalid_syntax("raise E, V from E1")
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def test_3x_style_invalid_2(self):
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self.invalid_syntax("raise E from E1, E2")
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def test_3x_style_invalid_3(self):
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self.invalid_syntax("raise from E1, E2")
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def test_3x_style_invalid_4(self):
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self.invalid_syntax("raise E from")
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# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testFuncdef
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class TestFunctionAnnotations(GrammarTest):
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def test_1(self):
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self.validate("""def f(x) -> list: pass""")
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def test_2(self):
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self.validate("""def f(x:int): pass""")
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def test_3(self):
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self.validate("""def f(*x:str): pass""")
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def test_4(self):
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self.validate("""def f(**x:float): pass""")
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def test_5(self):
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self.validate("""def f(x, y:1+2): pass""")
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def test_6(self):
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self.validate("""def f(a, (b:1, c:2, d)): pass""")
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def test_7(self):
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self.validate("""def f(a, (b:1, c:2, d), e:3=4, f=5, *g:6): pass""")
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def test_8(self):
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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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self.validate(s)
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class TestExcept(GrammarTest):
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def test_new(self):
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s = """
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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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self.validate(s)
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def test_old(self):
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s = """
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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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self.validate(s)
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# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testAtoms
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class TestSetLiteral(GrammarTest):
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def test_1(self):
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self.validate("""x = {'one'}""")
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def test_2(self):
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self.validate("""x = {'one', 1,}""")
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def test_3(self):
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self.validate("""x = {'one', 'two', 'three'}""")
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def test_4(self):
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self.validate("""x = {2, 3, 4,}""")
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class TestNumericLiterals(GrammarTest):
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def test_new_octal_notation(self):
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self.validate("""0o7777777777777""")
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self.invalid_syntax("""0o7324528887""")
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def test_new_binary_notation(self):
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self.validate("""0b101010""")
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self.invalid_syntax("""0b0101021""")
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class TestClassDef(GrammarTest):
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def test_new_syntax(self):
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self.validate("class B(t=7): pass")
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self.validate("class B(t, *args): pass")
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self.validate("class B(t, **kwargs): pass")
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self.validate("class B(t, *args, **kwargs): pass")
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self.validate("class B(t, y=9, *args, **kwargs): pass")
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class TestParserIdempotency(support.TestCase):
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"""A cut-down version of pytree_idempotency.py."""
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# Issue 13125
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@unittest.expectedFailure
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def test_all_project_files(self):
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for filepath in support.all_project_files():
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with open(filepath, "rb") as fp:
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encoding = tokenize.detect_encoding(fp.readline)[0]
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self.assertIsNotNone(encoding,
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"can't detect encoding for %s" % filepath)
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with open(filepath, "r", encoding=encoding) as fp:
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source = fp.read()
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try:
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tree = driver.parse_string(source)
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except ParseError as err:
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if verbose > 0:
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warnings.warn('ParseError on file %s (%s)' % (filepath, err))
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continue
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new = str(tree)
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x = diff(filepath, new)
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if x:
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self.fail("Idempotency failed: %s" % filepath)
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def test_extended_unpacking(self):
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driver.parse_string("a, *b, c = x\n")
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driver.parse_string("[*a, b] = x\n")
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driver.parse_string("(z, *y, w) = m\n")
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driver.parse_string("for *z, m in d: pass\n")
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class TestLiterals(GrammarTest):
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def validate(self, s):
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driver.parse_string(support.dedent(s) + "\n\n")
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def test_multiline_bytes_literals(self):
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s = """
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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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self.validate(s)
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def test_multiline_bytes_tripquote_literals(self):
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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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self.validate(s)
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def test_multiline_str_literals(self):
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s = """
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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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self.validate(s)
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def diff(fn, result):
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try:
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with open('@', 'w') as f:
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f.write(str(result))
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fn = fn.replace('"', '\\"')
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return subprocess.call(['diff', '-u', fn, '@'], stdout=(subprocess.DEVNULL if verbose < 1 else None))
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finally:
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try:
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os.remove("@")
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except OSError:
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pass
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