diff options
Diffstat (limited to 'Lib/test/test_grammar.py')
| -rw-r--r-- | Lib/test/test_grammar.py | 316 |
1 files changed, 303 insertions, 13 deletions
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py index 154e3b608c..65e26bfd38 100644 --- a/Lib/test/test_grammar.py +++ b/Lib/test/test_grammar.py @@ -8,6 +8,95 @@ import sys # testing import * from sys import * +# different import patterns to check that __annotations__ does not interfere +# with import machinery +import test.ann_module as ann_module +import typing +from collections import ChainMap +from test import ann_module2 +import test + +# These are shared with test_tokenize and other test modules. +# +# Note: since several test cases filter out floats by looking for "e" and ".", +# don't add hexadecimal literals that contain "e" or "E". +VALID_UNDERSCORE_LITERALS = [ + '0_0_0', + '4_2', + '1_0000_0000', + '0b1001_0100', + '0xffff_ffff', + '0o5_7_7', + '1_00_00.5', + '1_00_00.5e5', + '1_00_00e5_1', + '1e1_0', + '.1_4', + '.1_4e1', + '0b_0', + '0x_f', + '0o_5', + '1_00_00j', + '1_00_00.5j', + '1_00_00e5_1j', + '.1_4j', + '(1_2.5+3_3j)', + '(.5_6j)', +] +INVALID_UNDERSCORE_LITERALS = [ + # Trailing underscores: + '0_', + '42_', + '1.4j_', + '0x_', + '0b1_', + '0xf_', + '0o5_', + '0 if 1_Else 1', + # Underscores in the base selector: + '0_b0', + '0_xf', + '0_o5', + # Old-style octal, still disallowed: + '0_7', + '09_99', + # Multiple consecutive underscores: + '4_______2', + '0.1__4', + '0.1__4j', + '0b1001__0100', + '0xffff__ffff', + '0x___', + '0o5__77', + '1e1__0', + '1e1__0j', + # Underscore right before a dot: + '1_.4', + '1_.4j', + # Underscore right after a dot: + '1._4', + '1._4j', + '._5', + '._5j', + # Underscore right after a sign: + '1.0e+_1', + '1.0e+_1j', + # Underscore right before j: + '1.4_j', + '1.4e5_j', + # Underscore right before e: + '1_e1', + '1.4_e1', + '1.4_e1j', + # Underscore right after e: + '1e_1', + '1.4e_1', + '1.4e_1j', + # Complex cases with parens: + '(1+1.5_j_)', + '(1+1.5_j)', +] + class TokenTests(unittest.TestCase): @@ -87,6 +176,14 @@ class TokenTests(unittest.TestCase): self.assertEqual(1 if 0else 0, 0) self.assertRaises(SyntaxError, eval, "0 if 1Else 0") + def test_underscore_literals(self): + for lit in VALID_UNDERSCORE_LITERALS: + self.assertEqual(eval(lit), eval(lit.replace('_', ''))) + for lit in INVALID_UNDERSCORE_LITERALS: + self.assertRaises(SyntaxError, eval, lit) + # Sanity check: no literal begins with an underscore + self.assertRaises(NameError, eval, "_0") + def test_string_literals(self): x = ''; y = ""; self.assertTrue(len(x) == 0 and x == y) x = '\''; y = "'"; self.assertTrue(len(x) == 1 and x == y and ord(x) == 39) @@ -139,6 +236,19 @@ the \'lazy\' dog.\n\ compile(s, "<test>", "exec") self.assertIn("unexpected EOF", str(cm.exception)) +var_annot_global: int # a global annotated is necessary for test_var_annot + +# custom namespace for testing __annotations__ + +class CNS: + def __init__(self): + self._dct = {} + def __setitem__(self, item, value): + self._dct[item.lower()] = value + def __getitem__(self, item): + return self._dct[item] + + class GrammarTests(unittest.TestCase): # single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE @@ -154,6 +264,160 @@ class GrammarTests(unittest.TestCase): # testlist ENDMARKER x = eval('1, 0 or 1') + def test_var_annot_basics(self): + # all these should be allowed + var1: int = 5 + var2: [int, str] + my_lst = [42] + def one(): + return 1 + int.new_attr: int + [list][0]: type + my_lst[one()-1]: int = 5 + self.assertEqual(my_lst, [5]) + + def test_var_annot_syntax_errors(self): + # parser pass + check_syntax_error(self, "def f: int") + check_syntax_error(self, "x: int: str") + check_syntax_error(self, "def f():\n" + " nonlocal x: int\n") + # AST pass + check_syntax_error(self, "[x, 0]: int\n") + check_syntax_error(self, "f(): int\n") + check_syntax_error(self, "(x,): int") + check_syntax_error(self, "def f():\n" + " (x, y): int = (1, 2)\n") + # symtable pass + check_syntax_error(self, "def f():\n" + " x: int\n" + " global x\n") + check_syntax_error(self, "def f():\n" + " global x\n" + " x: int\n") + + def test_var_annot_basic_semantics(self): + # execution order + with self.assertRaises(ZeroDivisionError): + no_name[does_not_exist]: no_name_again = 1/0 + with self.assertRaises(NameError): + no_name[does_not_exist]: 1/0 = 0 + global var_annot_global + + # function semantics + def f(): + st: str = "Hello" + a.b: int = (1, 2) + return st + self.assertEqual(f.__annotations__, {}) + def f_OK(): + x: 1/0 + f_OK() + def fbad(): + x: int + print(x) + with self.assertRaises(UnboundLocalError): + fbad() + def f2bad(): + (no_such_global): int + print(no_such_global) + try: + f2bad() + except Exception as e: + self.assertIs(type(e), NameError) + + # class semantics + class C: + __foo: int + s: str = "attr" + z = 2 + def __init__(self, x): + self.x: int = x + self.assertEqual(C.__annotations__, {'_C__foo': int, 's': str}) + with self.assertRaises(NameError): + class CBad: + no_such_name_defined.attr: int = 0 + with self.assertRaises(NameError): + class Cbad2(C): + x: int + x.y: list = [] + + def test_var_annot_metaclass_semantics(self): + class CMeta(type): + @classmethod + def __prepare__(metacls, name, bases, **kwds): + return {'__annotations__': CNS()} + class CC(metaclass=CMeta): + XX: 'ANNOT' + self.assertEqual(CC.__annotations__['xx'], 'ANNOT') + + def test_var_annot_module_semantics(self): + with self.assertRaises(AttributeError): + print(test.__annotations__) + self.assertEqual(ann_module.__annotations__, + {1: 2, 'x': int, 'y': str, 'f': typing.Tuple[int, int]}) + self.assertEqual(ann_module.M.__annotations__, + {'123': 123, 'o': type}) + self.assertEqual(ann_module2.__annotations__, {}) + + def test_var_annot_in_module(self): + # check that functions fail the same way when executed + # outside of module where they were defined + from test.ann_module3 import f_bad_ann, g_bad_ann, D_bad_ann + with self.assertRaises(NameError): + f_bad_ann() + with self.assertRaises(NameError): + g_bad_ann() + with self.assertRaises(NameError): + D_bad_ann(5) + + def test_var_annot_simple_exec(self): + gns = {}; lns= {} + exec("'docstring'\n" + "__annotations__[1] = 2\n" + "x: int = 5\n", gns, lns) + self.assertEqual(lns["__annotations__"], {1: 2, 'x': int}) + with self.assertRaises(KeyError): + gns['__annotations__'] + + def test_var_annot_custom_maps(self): + # tests with custom locals() and __annotations__ + ns = {'__annotations__': CNS()} + exec('X: int; Z: str = "Z"; (w): complex = 1j', ns) + self.assertEqual(ns['__annotations__']['x'], int) + self.assertEqual(ns['__annotations__']['z'], str) + with self.assertRaises(KeyError): + ns['__annotations__']['w'] + nonloc_ns = {} + class CNS2: + def __init__(self): + self._dct = {} + def __setitem__(self, item, value): + nonlocal nonloc_ns + self._dct[item] = value + nonloc_ns[item] = value + def __getitem__(self, item): + return self._dct[item] + exec('x: int = 1', {}, CNS2()) + self.assertEqual(nonloc_ns['__annotations__']['x'], int) + + def test_var_annot_refleak(self): + # complex case: custom locals plus custom __annotations__ + # this was causing refleak + cns = CNS() + nonloc_ns = {'__annotations__': cns} + class CNS2: + def __init__(self): + self._dct = {'__annotations__': cns} + def __setitem__(self, item, value): + nonlocal nonloc_ns + self._dct[item] = value + nonloc_ns[item] = value + def __getitem__(self, item): + return self._dct[item] + exec('X: str', {}, CNS2()) + self.assertEqual(nonloc_ns['__annotations__']['x'], str) + def test_funcdef(self): ### [decorators] 'def' NAME parameters ['->' test] ':' suite ### decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE @@ -295,6 +559,10 @@ class GrammarTests(unittest.TestCase): pos2key2dict(1,2,k2=100,tokwarg1=100,tokwarg2=200) pos2key2dict(1,2,tokwarg1=100,tokwarg2=200, k2=100) + self.assertRaises(SyntaxError, eval, "def f(*): pass") + self.assertRaises(SyntaxError, eval, "def f(*,): pass") + self.assertRaises(SyntaxError, eval, "def f(*, **kwds): pass") + # keyword arguments after *arglist def f(*args, **kwargs): return args, kwargs @@ -341,7 +609,7 @@ class GrammarTests(unittest.TestCase): def f(x) -> list: pass self.assertEqual(f.__annotations__, {'return': list}) - # test MAKE_CLOSURE with a variety of oparg's + # test closures with a variety of opargs closure = 1 def f(): return closure def f(x=1): return closure @@ -352,6 +620,23 @@ class GrammarTests(unittest.TestCase): check_syntax_error(self, "f(*g(1=2))") check_syntax_error(self, "f(**g(1=2))") + # Check trailing commas are permitted in funcdef argument list + def f(a,): pass + def f(*args,): pass + def f(**kwds,): pass + def f(a, *args,): pass + def f(a, **kwds,): pass + def f(*args, b,): pass + def f(*, b,): pass + def f(*args, **kwds,): pass + def f(a, *args, b,): pass + def f(a, *, b,): pass + def f(a, *args, **kwds,): pass + def f(*args, b, **kwds,): pass + def f(*, b, **kwds,): pass + def f(a, *args, b, **kwds,): pass + def f(a, *, b, **kwds,): pass + def test_lambdef(self): ### lambdef: 'lambda' [varargslist] ':' test l1 = lambda : 0 @@ -370,6 +655,23 @@ class GrammarTests(unittest.TestCase): self.assertEqual(l6(1,2), 1+2+20) self.assertEqual(l6(1,2,k=10), 1+2+10) + # check that trailing commas are permitted + l10 = lambda a,: 0 + l11 = lambda *args,: 0 + l12 = lambda **kwds,: 0 + l13 = lambda a, *args,: 0 + l14 = lambda a, **kwds,: 0 + l15 = lambda *args, b,: 0 + l16 = lambda *, b,: 0 + l17 = lambda *args, **kwds,: 0 + l18 = lambda a, *args, b,: 0 + l19 = lambda a, *, b,: 0 + l20 = lambda a, *args, **kwds,: 0 + l21 = lambda *args, b, **kwds,: 0 + l22 = lambda *, b, **kwds,: 0 + l23 = lambda a, *args, b, **kwds,: 0 + l24 = lambda a, *, b, **kwds,: 0 + ### stmt: simple_stmt | compound_stmt # Tested below @@ -1040,18 +1342,6 @@ class GrammarTests(unittest.TestCase): self.assertEqual(m.other, 42) def test_async_await(self): - async = 1 - await = 2 - self.assertEqual(async, 1) - - def async(): - nonlocal await - await = 10 - async() - self.assertEqual(await, 10) - - self.assertFalse(bool(async.__code__.co_flags & inspect.CO_COROUTINE)) - async def test(): def sum(): pass |