470 lines
14 KiB
Python
470 lines
14 KiB
Python
"""Tests for the unparse.py script in the Tools/parser directory."""
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import unittest
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import test.support
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import pathlib
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import random
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import tokenize
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import ast
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import sys
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def read_pyfile(filename):
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"""Read and return the contents of a Python source file (as a
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string), taking into account the file encoding."""
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with tokenize.open(filename) as stream:
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return stream.read()
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for_else = """\
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def f():
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for x in range(10):
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break
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else:
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y = 2
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z = 3
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"""
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while_else = """\
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def g():
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while True:
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break
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else:
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y = 2
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z = 3
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"""
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relative_import = """\
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from . import fred
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from .. import barney
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from .australia import shrimp as prawns
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"""
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nonlocal_ex = """\
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def f():
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x = 1
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def g():
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nonlocal x
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x = 2
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y = 7
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def h():
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nonlocal x, y
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"""
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# also acts as test for 'except ... as ...'
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raise_from = """\
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try:
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1 / 0
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except ZeroDivisionError as e:
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raise ArithmeticError from e
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"""
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class_decorator = """\
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@f1(arg)
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@f2
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class Foo: pass
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"""
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elif1 = """\
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if cond1:
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suite1
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elif cond2:
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suite2
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else:
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suite3
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"""
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elif2 = """\
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if cond1:
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suite1
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elif cond2:
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suite2
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"""
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try_except_finally = """\
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try:
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suite1
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except ex1:
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suite2
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except ex2:
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suite3
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else:
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suite4
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finally:
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suite5
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"""
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with_simple = """\
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with f():
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suite1
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"""
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with_as = """\
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with f() as x:
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suite1
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"""
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with_two_items = """\
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with f() as x, g() as y:
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suite1
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"""
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docstring_prefixes = [
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"",
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"class foo():\n ",
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"def foo():\n ",
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"async def foo():\n ",
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]
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class ASTTestCase(unittest.TestCase):
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def assertASTEqual(self, ast1, ast2):
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self.assertEqual(ast.dump(ast1), ast.dump(ast2))
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def check_ast_roundtrip(self, code1, **kwargs):
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ast1 = ast.parse(code1, **kwargs)
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code2 = ast.unparse(ast1)
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ast2 = ast.parse(code2, **kwargs)
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self.assertASTEqual(ast1, ast2)
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def check_invalid(self, node, raises=ValueError):
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self.assertRaises(raises, ast.unparse, node)
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def get_source(self, code1, code2=None, strip=True):
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code2 = code2 or code1
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code1 = ast.unparse(ast.parse(code1))
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if strip:
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code1 = code1.strip()
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return code1, code2
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def check_src_roundtrip(self, code1, code2=None, strip=True):
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code1, code2 = self.get_source(code1, code2, strip)
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self.assertEqual(code2, code1)
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def check_src_dont_roundtrip(self, code1, code2=None, strip=True):
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code1, code2 = self.get_source(code1, code2, strip)
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self.assertNotEqual(code2, code1)
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class UnparseTestCase(ASTTestCase):
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# Tests for specific bugs found in earlier versions of unparse
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def test_fstrings(self):
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# See issue 25180
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self.check_ast_roundtrip(r"""f'{f"{0}"*3}'""")
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self.check_ast_roundtrip(r"""f'{f"{y}"*3}'""")
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def test_strings(self):
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self.check_ast_roundtrip("u'foo'")
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self.check_ast_roundtrip("r'foo'")
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self.check_ast_roundtrip("b'foo'")
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def test_del_statement(self):
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self.check_ast_roundtrip("del x, y, z")
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def test_shifts(self):
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self.check_ast_roundtrip("45 << 2")
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self.check_ast_roundtrip("13 >> 7")
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def test_for_else(self):
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self.check_ast_roundtrip(for_else)
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def test_while_else(self):
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self.check_ast_roundtrip(while_else)
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def test_unary_parens(self):
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self.check_ast_roundtrip("(-1)**7")
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self.check_ast_roundtrip("(-1.)**8")
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self.check_ast_roundtrip("(-1j)**6")
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self.check_ast_roundtrip("not True or False")
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self.check_ast_roundtrip("True or not False")
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def test_integer_parens(self):
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self.check_ast_roundtrip("3 .__abs__()")
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def test_huge_float(self):
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self.check_ast_roundtrip("1e1000")
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self.check_ast_roundtrip("-1e1000")
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self.check_ast_roundtrip("1e1000j")
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self.check_ast_roundtrip("-1e1000j")
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def test_min_int(self):
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self.check_ast_roundtrip(str(-(2 ** 31)))
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self.check_ast_roundtrip(str(-(2 ** 63)))
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def test_imaginary_literals(self):
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self.check_ast_roundtrip("7j")
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self.check_ast_roundtrip("-7j")
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self.check_ast_roundtrip("0j")
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self.check_ast_roundtrip("-0j")
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def test_lambda_parentheses(self):
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self.check_ast_roundtrip("(lambda: int)()")
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def test_chained_comparisons(self):
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self.check_ast_roundtrip("1 < 4 <= 5")
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self.check_ast_roundtrip("a is b is c is not d")
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def test_function_arguments(self):
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self.check_ast_roundtrip("def f(): pass")
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self.check_ast_roundtrip("def f(a): pass")
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self.check_ast_roundtrip("def f(b = 2): pass")
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self.check_ast_roundtrip("def f(a, b): pass")
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self.check_ast_roundtrip("def f(a, b = 2): pass")
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self.check_ast_roundtrip("def f(a = 5, b = 2): pass")
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self.check_ast_roundtrip("def f(*, a = 1, b = 2): pass")
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self.check_ast_roundtrip("def f(*, a = 1, b): pass")
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self.check_ast_roundtrip("def f(*, a, b = 2): pass")
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self.check_ast_roundtrip("def f(a, b = None, *, c, **kwds): pass")
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self.check_ast_roundtrip("def f(a=2, *args, c=5, d, **kwds): pass")
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self.check_ast_roundtrip("def f(*args, **kwargs): pass")
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def test_relative_import(self):
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self.check_ast_roundtrip(relative_import)
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def test_nonlocal(self):
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self.check_ast_roundtrip(nonlocal_ex)
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def test_raise_from(self):
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self.check_ast_roundtrip(raise_from)
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def test_bytes(self):
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self.check_ast_roundtrip("b'123'")
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def test_annotations(self):
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self.check_ast_roundtrip("def f(a : int): pass")
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self.check_ast_roundtrip("def f(a: int = 5): pass")
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self.check_ast_roundtrip("def f(*args: [int]): pass")
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self.check_ast_roundtrip("def f(**kwargs: dict): pass")
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self.check_ast_roundtrip("def f() -> None: pass")
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def test_set_literal(self):
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self.check_ast_roundtrip("{'a', 'b', 'c'}")
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def test_set_comprehension(self):
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self.check_ast_roundtrip("{x for x in range(5)}")
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def test_dict_comprehension(self):
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self.check_ast_roundtrip("{x: x*x for x in range(10)}")
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def test_class_decorators(self):
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self.check_ast_roundtrip(class_decorator)
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def test_class_definition(self):
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self.check_ast_roundtrip("class A(metaclass=type, *[], **{}): pass")
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def test_elifs(self):
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self.check_ast_roundtrip(elif1)
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self.check_ast_roundtrip(elif2)
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def test_try_except_finally(self):
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self.check_ast_roundtrip(try_except_finally)
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def test_starred_assignment(self):
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self.check_ast_roundtrip("a, *b, c = seq")
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self.check_ast_roundtrip("a, (*b, c) = seq")
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self.check_ast_roundtrip("a, *b[0], c = seq")
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self.check_ast_roundtrip("a, *(b, c) = seq")
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def test_with_simple(self):
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self.check_ast_roundtrip(with_simple)
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def test_with_as(self):
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self.check_ast_roundtrip(with_as)
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def test_with_two_items(self):
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self.check_ast_roundtrip(with_two_items)
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def test_dict_unpacking_in_dict(self):
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# See issue 26489
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self.check_ast_roundtrip(r"""{**{'y': 2}, 'x': 1}""")
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self.check_ast_roundtrip(r"""{**{'y': 2}, **{'x': 1}}""")
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def test_ext_slices(self):
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self.check_ast_roundtrip("a[i]")
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self.check_ast_roundtrip("a[i,]")
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self.check_ast_roundtrip("a[i, j]")
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self.check_ast_roundtrip("a[()]")
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self.check_ast_roundtrip("a[i:j]")
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self.check_ast_roundtrip("a[:j]")
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self.check_ast_roundtrip("a[i:]")
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self.check_ast_roundtrip("a[i:j:k]")
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self.check_ast_roundtrip("a[:j:k]")
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self.check_ast_roundtrip("a[i::k]")
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self.check_ast_roundtrip("a[i:j,]")
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self.check_ast_roundtrip("a[i:j, k]")
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def test_invalid_raise(self):
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self.check_invalid(ast.Raise(exc=None, cause=ast.Name(id="X")))
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def test_invalid_fstring_constant(self):
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self.check_invalid(ast.JoinedStr(values=[ast.Constant(value=100)]))
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def test_invalid_fstring_conversion(self):
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self.check_invalid(
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ast.FormattedValue(
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value=ast.Constant(value="a", kind=None),
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conversion=ord("Y"), # random character
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format_spec=None,
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)
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)
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def test_invalid_set(self):
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self.check_invalid(ast.Set(elts=[]))
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def test_invalid_yield_from(self):
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self.check_invalid(ast.YieldFrom(value=None))
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def test_docstrings(self):
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docstrings = (
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'this ends with double quote"',
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'this includes a """triple quote"""'
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)
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for docstring in docstrings:
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# check as Module docstrings for easy testing
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self.check_ast_roundtrip(f"'{docstring}'")
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def test_constant_tuples(self):
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self.check_src_roundtrip(ast.Constant(value=(1,), kind=None), "(1,)")
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self.check_src_roundtrip(
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ast.Constant(value=(1, 2, 3), kind=None), "(1, 2, 3)"
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)
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@test.support.skip_if_new_parser("Pegen does not support type annotation yet")
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def test_function_type(self):
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for function_type in (
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"() -> int",
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"(int, int) -> int",
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"(Callable[complex], More[Complex(call.to_typevar())]) -> None"
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):
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self.check_ast_roundtrip(function_type, mode="func_type")
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class CosmeticTestCase(ASTTestCase):
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"""Test if there are cosmetic issues caused by unnecesary additions"""
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def test_simple_expressions_parens(self):
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self.check_src_roundtrip("(a := b)")
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self.check_src_roundtrip("await x")
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self.check_src_roundtrip("x if x else y")
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self.check_src_roundtrip("lambda x: x")
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self.check_src_roundtrip("1 + 1")
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self.check_src_roundtrip("1 + 2 / 3")
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self.check_src_roundtrip("(1 + 2) / 3")
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self.check_src_roundtrip("(1 + 2) * 3 + 4 * (5 + 2)")
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self.check_src_roundtrip("(1 + 2) * 3 + 4 * (5 + 2) ** 2")
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self.check_src_roundtrip("~ x")
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self.check_src_roundtrip("x and y")
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self.check_src_roundtrip("x and y and z")
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self.check_src_roundtrip("x and (y and x)")
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self.check_src_roundtrip("(x and y) and z")
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self.check_src_roundtrip("(x ** y) ** z ** q")
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self.check_src_roundtrip("x >> y")
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self.check_src_roundtrip("x << y")
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self.check_src_roundtrip("x >> y and x >> z")
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self.check_src_roundtrip("x + y - z * q ^ t ** k")
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self.check_src_roundtrip("P * V if P and V else n * R * T")
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self.check_src_roundtrip("lambda P, V, n: P * V == n * R * T")
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self.check_src_roundtrip("flag & (other | foo)")
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self.check_src_roundtrip("not x == y")
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self.check_src_roundtrip("x == (not y)")
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self.check_src_roundtrip("yield x")
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self.check_src_roundtrip("yield from x")
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self.check_src_roundtrip("call((yield x))")
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self.check_src_roundtrip("return x + (yield x)")
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def test_docstrings(self):
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docstrings = (
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'"""simple doc string"""',
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'''"""A more complex one
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with some newlines"""''',
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'''"""Foo bar baz
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empty newline"""''',
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'"""With some \t"""',
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'"""Foo "bar" baz """',
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)
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for prefix in docstring_prefixes:
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for docstring in docstrings:
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self.check_src_roundtrip(f"{prefix}{docstring}")
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def test_docstrings_negative_cases(self):
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# Test some cases that involve strings in the children of the
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# first node but aren't docstrings to make sure we don't have
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# False positives.
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docstrings_negative = (
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'a = """false"""',
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'"""false""" + """unless its optimized"""',
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'1 + 1\n"""false"""',
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'f"""no, top level but f-fstring"""'
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)
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for prefix in docstring_prefixes:
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for negative in docstrings_negative:
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# this cases should be result with single quote
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# rather then triple quoted docstring
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src = f"{prefix}{negative}"
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self.check_ast_roundtrip(src)
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self.check_src_dont_roundtrip(src)
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class DirectoryTestCase(ASTTestCase):
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"""Test roundtrip behaviour on all files in Lib and Lib/test."""
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lib_dir = pathlib.Path(__file__).parent / ".."
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test_directories = (lib_dir, lib_dir / "test")
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skip_files = {"test_fstring.py"}
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run_always_files = {"test_grammar.py", "test_syntax.py", "test_compile.py",
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"test_ast.py", "test_asdl_parser.py"}
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_files_to_test = None
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@classmethod
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def files_to_test(cls):
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if cls._files_to_test is not None:
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return cls._files_to_test
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items = [
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item.resolve()
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for directory in cls.test_directories
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for item in directory.glob("*.py")
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if not item.name.startswith("bad")
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]
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# Test limited subset of files unless the 'cpu' resource is specified.
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if not test.support.is_resource_enabled("cpu"):
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tests_to_run_always = {item for item in items if
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item.name in cls.run_always_files}
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items = set(random.sample(items, 10))
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# Make sure that at least tests that heavily use grammar features are
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# always considered in order to reduce the chance of missing something.
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items = list(items | tests_to_run_always)
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# bpo-31174: Store the names sample to always test the same files.
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# It prevents false alarms when hunting reference leaks.
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cls._files_to_test = items
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return items
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def test_files(self):
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for item in self.files_to_test():
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if test.support.verbose:
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print(f"Testing {item.absolute()}")
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# Some f-strings are not correctly round-tripped by
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# Tools/parser/unparse.py. See issue 28002 for details.
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# We need to skip files that contain such f-strings.
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if item.name in self.skip_files:
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if test.support.verbose:
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print(f"Skipping {item.absolute()}: see issue 28002")
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continue
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with self.subTest(filename=item):
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source = read_pyfile(item)
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self.check_ast_roundtrip(source)
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if __name__ == "__main__":
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unittest.main()
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