mirror of https://github.com/python/cpython
322 lines
12 KiB
Python
322 lines
12 KiB
Python
"""
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Unit tests for refactor.py.
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"""
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from __future__ import with_statement
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import sys
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import os
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import codecs
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import operator
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import io
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import tempfile
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import shutil
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import unittest
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import warnings
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from lib2to3 import refactor, pygram, fixer_base
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from lib2to3.pgen2 import token
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from . import support
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TEST_DATA_DIR = os.path.join(os.path.dirname(__file__), "data")
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FIXER_DIR = os.path.join(TEST_DATA_DIR, "fixers")
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sys.path.append(FIXER_DIR)
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try:
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_DEFAULT_FIXERS = refactor.get_fixers_from_package("myfixes")
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finally:
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sys.path.pop()
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_2TO3_FIXERS = refactor.get_fixers_from_package("lib2to3.fixes")
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class TestRefactoringTool(unittest.TestCase):
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def setUp(self):
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sys.path.append(FIXER_DIR)
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def tearDown(self):
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sys.path.pop()
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def check_instances(self, instances, classes):
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for inst, cls in zip(instances, classes):
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if not isinstance(inst, cls):
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self.fail("%s are not instances of %s" % instances, classes)
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def rt(self, options=None, fixers=_DEFAULT_FIXERS, explicit=None):
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return refactor.RefactoringTool(fixers, options, explicit)
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def test_print_function_option(self):
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rt = self.rt({"print_function" : True})
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self.assertIs(rt.grammar, pygram.python_grammar_no_print_statement)
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self.assertIs(rt.driver.grammar,
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pygram.python_grammar_no_print_statement)
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def test_write_unchanged_files_option(self):
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rt = self.rt()
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self.assertFalse(rt.write_unchanged_files)
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rt = self.rt({"write_unchanged_files" : True})
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self.assertTrue(rt.write_unchanged_files)
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def test_fixer_loading_helpers(self):
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contents = ["explicit", "first", "last", "parrot", "preorder"]
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non_prefixed = refactor.get_all_fix_names("myfixes")
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prefixed = refactor.get_all_fix_names("myfixes", False)
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full_names = refactor.get_fixers_from_package("myfixes")
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self.assertEqual(prefixed, ["fix_" + name for name in contents])
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self.assertEqual(non_prefixed, contents)
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self.assertEqual(full_names,
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["myfixes.fix_" + name for name in contents])
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def test_detect_future_features(self):
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run = refactor._detect_future_features
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fs = frozenset
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empty = fs()
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self.assertEqual(run(""), empty)
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self.assertEqual(run("from __future__ import print_function"),
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fs(("print_function",)))
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self.assertEqual(run("from __future__ import generators"),
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fs(("generators",)))
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self.assertEqual(run("from __future__ import generators, feature"),
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fs(("generators", "feature")))
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inp = "from __future__ import generators, print_function"
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self.assertEqual(run(inp), fs(("generators", "print_function")))
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inp ="from __future__ import print_function, generators"
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self.assertEqual(run(inp), fs(("print_function", "generators")))
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inp = "from __future__ import (print_function,)"
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self.assertEqual(run(inp), fs(("print_function",)))
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inp = "from __future__ import (generators, print_function)"
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self.assertEqual(run(inp), fs(("generators", "print_function")))
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inp = "from __future__ import (generators, nested_scopes)"
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self.assertEqual(run(inp), fs(("generators", "nested_scopes")))
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inp = """from __future__ import generators
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from __future__ import print_function"""
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self.assertEqual(run(inp), fs(("generators", "print_function")))
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invalid = ("from",
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"from 4",
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"from x",
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"from x 5",
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"from x im",
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"from x import",
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"from x import 4",
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)
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for inp in invalid:
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self.assertEqual(run(inp), empty)
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inp = "'docstring'\nfrom __future__ import print_function"
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self.assertEqual(run(inp), fs(("print_function",)))
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inp = "'docstring'\n'somng'\nfrom __future__ import print_function"
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self.assertEqual(run(inp), empty)
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inp = "# comment\nfrom __future__ import print_function"
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self.assertEqual(run(inp), fs(("print_function",)))
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inp = "# comment\n'doc'\nfrom __future__ import print_function"
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self.assertEqual(run(inp), fs(("print_function",)))
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inp = "class x: pass\nfrom __future__ import print_function"
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self.assertEqual(run(inp), empty)
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def test_get_headnode_dict(self):
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class NoneFix(fixer_base.BaseFix):
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pass
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class FileInputFix(fixer_base.BaseFix):
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PATTERN = "file_input< any * >"
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class SimpleFix(fixer_base.BaseFix):
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PATTERN = "'name'"
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no_head = NoneFix({}, [])
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with_head = FileInputFix({}, [])
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simple = SimpleFix({}, [])
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d = refactor._get_headnode_dict([no_head, with_head, simple])
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top_fixes = d.pop(pygram.python_symbols.file_input)
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self.assertEqual(top_fixes, [with_head, no_head])
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name_fixes = d.pop(token.NAME)
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self.assertEqual(name_fixes, [simple, no_head])
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for fixes in d.values():
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self.assertEqual(fixes, [no_head])
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def test_fixer_loading(self):
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from myfixes.fix_first import FixFirst
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from myfixes.fix_last import FixLast
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from myfixes.fix_parrot import FixParrot
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from myfixes.fix_preorder import FixPreorder
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rt = self.rt()
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pre, post = rt.get_fixers()
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self.check_instances(pre, [FixPreorder])
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self.check_instances(post, [FixFirst, FixParrot, FixLast])
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def test_naughty_fixers(self):
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self.assertRaises(ImportError, self.rt, fixers=["not_here"])
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self.assertRaises(refactor.FixerError, self.rt, fixers=["no_fixer_cls"])
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self.assertRaises(refactor.FixerError, self.rt, fixers=["bad_order"])
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def test_refactor_string(self):
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rt = self.rt()
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input = "def parrot(): pass\n\n"
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tree = rt.refactor_string(input, "<test>")
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self.assertNotEqual(str(tree), input)
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input = "def f(): pass\n\n"
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tree = rt.refactor_string(input, "<test>")
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self.assertEqual(str(tree), input)
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def test_refactor_stdin(self):
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class MyRT(refactor.RefactoringTool):
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def print_output(self, old_text, new_text, filename, equal):
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results.extend([old_text, new_text, filename, equal])
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results = []
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rt = MyRT(_DEFAULT_FIXERS)
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save = sys.stdin
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sys.stdin = io.StringIO("def parrot(): pass\n\n")
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try:
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rt.refactor_stdin()
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finally:
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sys.stdin = save
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expected = ["def parrot(): pass\n\n",
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"def cheese(): pass\n\n",
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"<stdin>", False]
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self.assertEqual(results, expected)
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def check_file_refactoring(self, test_file, fixers=_2TO3_FIXERS,
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options=None, mock_log_debug=None,
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actually_write=True):
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tmpdir = tempfile.mkdtemp(prefix="2to3-test_refactor")
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self.addCleanup(shutil.rmtree, tmpdir)
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# make a copy of the tested file that we can write to
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shutil.copy(test_file, tmpdir)
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test_file = os.path.join(tmpdir, os.path.basename(test_file))
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os.chmod(test_file, 0o644)
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def read_file():
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with open(test_file, "rb") as fp:
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return fp.read()
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old_contents = read_file()
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rt = self.rt(fixers=fixers, options=options)
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if mock_log_debug:
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rt.log_debug = mock_log_debug
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rt.refactor_file(test_file)
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self.assertEqual(old_contents, read_file())
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if not actually_write:
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return
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rt.refactor_file(test_file, True)
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new_contents = read_file()
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self.assertNotEqual(old_contents, new_contents)
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return new_contents
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def test_refactor_file(self):
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test_file = os.path.join(FIXER_DIR, "parrot_example.py")
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self.check_file_refactoring(test_file, _DEFAULT_FIXERS)
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def test_refactor_file_write_unchanged_file(self):
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test_file = os.path.join(FIXER_DIR, "parrot_example.py")
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debug_messages = []
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def recording_log_debug(msg, *args):
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debug_messages.append(msg % args)
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self.check_file_refactoring(test_file, fixers=(),
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options={"write_unchanged_files": True},
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mock_log_debug=recording_log_debug,
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actually_write=False)
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# Testing that it logged this message when write=False was passed is
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# sufficient to see that it did not bail early after "No changes".
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message_regex = r"Not writing changes to .*%s%s" % (
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os.sep, os.path.basename(test_file))
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for message in debug_messages:
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if "Not writing changes" in message:
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self.assertRegex(message, message_regex)
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break
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else:
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self.fail("%r not matched in %r" % (message_regex, debug_messages))
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def test_refactor_dir(self):
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def check(structure, expected):
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def mock_refactor_file(self, f, *args):
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got.append(f)
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save_func = refactor.RefactoringTool.refactor_file
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refactor.RefactoringTool.refactor_file = mock_refactor_file
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rt = self.rt()
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got = []
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dir = tempfile.mkdtemp(prefix="2to3-test_refactor")
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try:
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os.mkdir(os.path.join(dir, "a_dir"))
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for fn in structure:
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open(os.path.join(dir, fn), "wb").close()
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rt.refactor_dir(dir)
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finally:
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refactor.RefactoringTool.refactor_file = save_func
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shutil.rmtree(dir)
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self.assertEqual(got,
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[os.path.join(dir, path) for path in expected])
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check([], [])
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tree = ["nothing",
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"hi.py",
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".dumb",
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".after.py",
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"notpy.npy",
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"sappy"]
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expected = ["hi.py"]
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check(tree, expected)
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tree = ["hi.py",
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os.path.join("a_dir", "stuff.py")]
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check(tree, tree)
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def test_file_encoding(self):
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fn = os.path.join(TEST_DATA_DIR, "different_encoding.py")
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self.check_file_refactoring(fn)
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def test_false_file_encoding(self):
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fn = os.path.join(TEST_DATA_DIR, "false_encoding.py")
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data = self.check_file_refactoring(fn)
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def test_bom(self):
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fn = os.path.join(TEST_DATA_DIR, "bom.py")
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data = self.check_file_refactoring(fn)
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self.assertTrue(data.startswith(codecs.BOM_UTF8))
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def test_crlf_newlines(self):
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old_sep = os.linesep
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os.linesep = "\r\n"
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try:
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fn = os.path.join(TEST_DATA_DIR, "crlf.py")
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fixes = refactor.get_fixers_from_package("lib2to3.fixes")
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self.check_file_refactoring(fn, fixes)
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finally:
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os.linesep = old_sep
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def test_refactor_docstring(self):
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rt = self.rt()
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doc = """
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>>> example()
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42
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"""
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out = rt.refactor_docstring(doc, "<test>")
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self.assertEqual(out, doc)
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doc = """
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>>> def parrot():
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... return 43
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"""
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out = rt.refactor_docstring(doc, "<test>")
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self.assertNotEqual(out, doc)
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def test_explicit(self):
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from myfixes.fix_explicit import FixExplicit
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rt = self.rt(fixers=["myfixes.fix_explicit"])
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self.assertEqual(len(rt.post_order), 0)
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rt = self.rt(explicit=["myfixes.fix_explicit"])
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for fix in rt.post_order:
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if isinstance(fix, FixExplicit):
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break
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else:
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self.fail("explicit fixer not loaded")
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