634 lines
21 KiB
Python
634 lines
21 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, driver_no_print_statement
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# Python imports
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import difflib
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import importlib
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import operator
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import os
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import pickle
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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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# 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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def test_load_packaged_grammar(self):
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modname = __name__ + '.load_test'
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class MyLoader:
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def get_data(self, where):
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return pickle.dumps({'elephant': 19})
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class MyModule:
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__file__ = 'parsertestmodule'
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__spec__ = importlib.util.spec_from_loader(modname, MyLoader())
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sys.modules[modname] = MyModule()
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self.addCleanup(operator.delitem, sys.modules, modname)
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g = pgen2_driver.load_packaged_grammar(modname, 'Grammar.txt')
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self.assertEqual(g.elephant, 19)
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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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[i async for i in b]
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""")
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self.validate("""async def foo():
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{i for i in b
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async for i in a if await i
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for b in i}
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""")
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self.validate("""async def foo():
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[await i for i in b if await c]
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""")
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self.validate("""async def foo():
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[ i for i in b if c]
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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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# Modelled after Lib/test/test_grammar.py:TokenTests.test_funcdef issue2292
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# and Lib/test/text_parser.py test_list_displays, test_set_displays,
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# test_dict_displays, test_argument_unpacking, ... changes.
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class TestUnpackingGeneralizations(GrammarTest):
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def test_mid_positional_star(self):
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self.validate("""func(1, *(2, 3), 4)""")
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def test_double_star_dict_literal(self):
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self.validate("""func(**{'eggs':'scrambled', 'spam':'fried'})""")
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def test_double_star_dict_literal_after_keywords(self):
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self.validate("""func(spam='fried', **{'eggs':'scrambled'})""")
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def test_list_display(self):
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self.validate("""[*{2}, 3, *[4]]""")
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def test_set_display(self):
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self.validate("""{*{2}, 3, *[4]}""")
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def test_dict_display_1(self):
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self.validate("""{**{}}""")
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def test_dict_display_2(self):
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self.validate("""{**{}, 3:4, **{5:6, 7:8}}""")
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def test_argument_unpacking_1(self):
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self.validate("""f(a, *b, *c, d)""")
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def test_argument_unpacking_2(self):
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self.validate("""f(**a, **b)""")
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def test_argument_unpacking_3(self):
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self.validate("""f(2, *a, *b, **b, **c, **d)""")
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def test_trailing_commas_1(self):
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self.validate("def f(a, b): call(a, b)")
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self.validate("def f(a, b,): call(a, b,)")
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def test_trailing_commas_2(self):
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self.validate("def f(a, *b): call(a, *b)")
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self.validate("def f(a, *b,): call(a, *b,)")
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def test_trailing_commas_3(self):
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self.validate("def f(a, b=1): call(a, b=1)")
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self.validate("def f(a, b=1,): call(a, b=1,)")
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def test_trailing_commas_4(self):
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self.validate("def f(a, **b): call(a, **b)")
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self.validate("def f(a, **b,): call(a, **b,)")
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def test_trailing_commas_5(self):
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self.validate("def f(*a, b=1): call(*a, b=1)")
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self.validate("def f(*a, b=1,): call(*a, b=1,)")
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def test_trailing_commas_6(self):
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self.validate("def f(*a, **b): call(*a, **b)")
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self.validate("def f(*a, **b,): call(*a, **b,)")
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def test_trailing_commas_7(self):
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self.validate("def f(*, b=1): call(*b)")
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self.validate("def f(*, b=1,): call(*b,)")
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def test_trailing_commas_8(self):
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self.validate("def f(a=1, b=2): call(a=1, b=2)")
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self.validate("def f(a=1, b=2,): call(a=1, b=2,)")
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def test_trailing_commas_9(self):
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self.validate("def f(a=1, **b): call(a=1, **b)")
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self.validate("def f(a=1, **b,): call(a=1, **b,)")
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def test_trailing_commas_lambda_1(self):
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self.validate("f = lambda a, b: call(a, b)")
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self.validate("f = lambda a, b,: call(a, b,)")
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def test_trailing_commas_lambda_2(self):
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self.validate("f = lambda a, *b: call(a, *b)")
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self.validate("f = lambda a, *b,: call(a, *b,)")
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def test_trailing_commas_lambda_3(self):
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self.validate("f = lambda a, b=1: call(a, b=1)")
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self.validate("f = lambda a, b=1,: call(a, b=1,)")
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def test_trailing_commas_lambda_4(self):
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self.validate("f = lambda a, **b: call(a, **b)")
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self.validate("f = lambda a, **b,: call(a, **b,)")
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def test_trailing_commas_lambda_5(self):
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self.validate("f = lambda *a, b=1: call(*a, b=1)")
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self.validate("f = lambda *a, b=1,: call(*a, b=1,)")
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def test_trailing_commas_lambda_6(self):
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self.validate("f = lambda *a, **b: call(*a, **b)")
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self.validate("f = lambda *a, **b,: call(*a, **b,)")
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def test_trailing_commas_lambda_7(self):
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self.validate("f = lambda *, b=1: call(*b)")
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self.validate("f = lambda *, b=1,: call(*b,)")
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def test_trailing_commas_lambda_8(self):
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self.validate("f = lambda a=1, b=2: call(a=1, b=2)")
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self.validate("f = lambda a=1, b=2,: call(a=1, b=2,)")
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def test_trailing_commas_lambda_9(self):
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self.validate("f = lambda a=1, **b: call(a=1, **b)")
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self.validate("f = lambda a=1, **b,: call(a=1, **b,)")
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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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def test_9(self):
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s = """def f(
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a: str,
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b: int,
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*,
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c: bool = False,
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**kwargs,
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) -> None:
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call(c=c, **kwargs,)"""
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self.validate(s)
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def test_10(self):
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s = """def f(
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a: str,
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) -> None:
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call(a,)"""
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self.validate(s)
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def test_11(self):
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s = """def f(
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a: str = '',
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) -> None:
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call(a=a,)"""
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self.validate(s)
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def test_12(self):
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s = """def f(
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*args: str,
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) -> None:
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call(*args,)"""
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self.validate(s)
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def test_13(self):
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self.validate("def f(a: str, b: int) -> None: call(a, b)")
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self.validate("def f(a: str, b: int,) -> None: call(a, b,)")
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def test_14(self):
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self.validate("def f(a: str, *b: int) -> None: call(a, *b)")
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self.validate("def f(a: str, *b: int,) -> None: call(a, *b,)")
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def test_15(self):
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self.validate("def f(a: str, b: int=1) -> None: call(a, b=1)")
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self.validate("def f(a: str, b: int=1,) -> None: call(a, b=1,)")
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def test_16(self):
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self.validate("def f(a: str, **b: int) -> None: call(a, **b)")
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self.validate("def f(a: str, **b: int,) -> None: call(a, **b,)")
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def test_17(self):
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self.validate("def f(*a: str, b: int=1) -> None: call(*a, b=1)")
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self.validate("def f(*a: str, b: int=1,) -> None: call(*a, b=1,)")
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def test_18(self):
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self.validate("def f(*a: str, **b: int) -> None: call(*a, **b)")
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self.validate("def f(*a: str, **b: int,) -> None: call(*a, **b,)")
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def test_19(self):
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self.validate("def f(*, b: int=1) -> None: call(*b)")
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self.validate("def f(*, b: int=1,) -> None: call(*b,)")
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def test_20(self):
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self.validate("def f(a: str='', b: int=2) -> None: call(a=a, b=2)")
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self.validate("def f(a: str='', b: int=2,) -> None: call(a=a, b=2,)")
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def test_21(self):
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self.validate("def f(a: str='', **b: int) -> None: call(a=a, **b)")
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self.validate("def f(a: str='', **b: int,) -> None: call(a=a, **b,)")
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# Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.test_var_annot
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class TestVarAnnotations(GrammarTest):
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def test_1(self):
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self.validate("var1: int = 5")
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def test_2(self):
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self.validate("var2: [int, str]")
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def test_3(self):
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self.validate("def f():\n"
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" st: str = 'Hello'\n"
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" a.b: int = (1, 2)\n"
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" return st\n")
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def test_4(self):
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self.validate("def fbad():\n"
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" x: int\n"
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" print(x)\n")
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def test_5(self):
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self.validate("class C:\n"
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" x: int\n"
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" s: str = 'attr'\n"
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" z = 2\n"
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" def __init__(self, x):\n"
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" self.x: int = x\n")
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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)
|
||
|
||
|
||
class TestStringLiterals(GrammarTest):
|
||
prefixes = ("'", '"',
|
||
"r'", 'r"', "R'", 'R"',
|
||
"u'", 'u"', "U'", 'U"',
|
||
"b'", 'b"', "B'", 'B"',
|
||
"f'", 'f"', "F'", 'F"',
|
||
"ur'", 'ur"', "Ur'", 'Ur"',
|
||
"uR'", 'uR"', "UR'", 'UR"',
|
||
"br'", 'br"', "Br'", 'Br"',
|
||
"bR'", 'bR"', "BR'", 'BR"',
|
||
"rb'", 'rb"', "Rb'", 'Rb"',
|
||
"rB'", 'rB"', "RB'", 'RB"',)
|
||
|
||
def test_lit(self):
|
||
for pre in self.prefixes:
|
||
single = "{p}spamspamspam{s}".format(p=pre, s=pre[-1])
|
||
self.validate(single)
|
||
triple = "{p}{s}{s}eggs{s}{s}{s}".format(p=pre, s=pre[-1])
|
||
self.validate(triple)
|
||
|
||
|
||
# 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,}""")
|
||
|
||
|
||
# Adapted from Python 3's Lib/test/test_unicode_identifiers.py and
|
||
# Lib/test/test_tokenize.py:TokenizeTest.test_non_ascii_identifiers
|
||
class TestIdentfier(GrammarTest):
|
||
def test_non_ascii_identifiers(self):
|
||
self.validate("Örter = 'places'\ngrün = 'green'")
|
||
self.validate("蟒 = a蟒 = 锦蛇 = 1")
|
||
self.validate("µ = aµ = µµ = 1")
|
||
self.validate("𝔘𝔫𝔦𝔠𝔬𝔡𝔢 = a_𝔘𝔫𝔦𝔠𝔬𝔡𝔢 = 1")
|
||
|
||
|
||
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."""
|
||
|
||
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:
|
||
try:
|
||
tree = driver_no_print_statement.parse_string(source)
|
||
except ParseError as err:
|
||
self.fail('ParseError on file %s (%s)' % (filepath, err))
|
||
new = str(tree)
|
||
if new != source:
|
||
print(diff_texts(source, new, filepath))
|
||
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_texts(a, b, filename):
|
||
a = a.splitlines()
|
||
b = b.splitlines()
|
||
return difflib.unified_diff(a, b, filename, filename,
|
||
"(original)", "(reserialized)",
|
||
lineterm="")
|
||
|
||
|
||
if __name__ == '__main__':
|
||
unittest.main()
|