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# Copyright (C) 2006, 2011 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Test that lazy regexes are not compiled right away"""
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class TestErrors(tests.TestCase):
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def test_invalid_pattern(self):
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error = lazy_regex.InvalidPattern('Bad pattern msg.')
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self.assertEqualDiff("Invalid pattern(s) found. Bad pattern msg.",
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class InstrumentedLazyRegex(lazy_regex.LazyRegex):
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"""Keep track of actions on the lazy regex"""
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def use_actions(cls, actions):
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cls._actions = actions
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def __getattr__(self, attr):
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self._actions.append(('__getattr__', attr))
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return super(InstrumentedLazyRegex, self).__getattr__(attr)
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def _real_re_compile(self, *args, **kwargs):
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self._actions.append(('_real_re_compile', args, kwargs))
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return super(InstrumentedLazyRegex, self)._real_re_compile(
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class TestLazyRegex(tests.TestCase):
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def test_lazy_compile(self):
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"""Make sure that LazyRegex objects compile at the right time"""
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InstrumentedLazyRegex.use_actions(actions)
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pattern = InstrumentedLazyRegex(args=('foo',), kwargs={})
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actions.append(('created regex', 'foo'))
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# This match call should compile the regex and go through __getattr__
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# But a further call should not go through __getattr__ because it has
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self.assertEqual([('created regex', 'foo'),
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('__getattr__', 'match'),
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('_real_re_compile', ('foo',), {}),
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def test_bad_pattern(self):
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"""Ensure lazy regex handles bad patterns cleanly."""
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p = lazy_regex.lazy_compile('RE:[')
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# As p.match is lazy, we make it into a lambda so its handled
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# by assertRaises correctly.
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e = self.assertRaises(lazy_regex.InvalidPattern,
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lambda: p.match('foo'))
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# Expect either old or new form of error message
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self.assertContainsRe(e.msg, '^"RE:\\[" '
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'(unexpected end of regular expression'
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'|unterminated character set at position 3)$')
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class TestLazyCompile(tests.TestCase):
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def test_simple_acts_like_regex(self):
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"""Test that the returned object has basic regex like functionality"""
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pattern = lazy_regex.lazy_compile('foo')
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self.assertIsInstance(pattern, lazy_regex.LazyRegex)
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self.assertTrue(pattern.match('foo'))
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self.assertIs(None, pattern.match('bar'))
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def test_extra_args(self):
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"""Test that extra arguments are also properly passed"""
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pattern = lazy_regex.lazy_compile('foo', re.I)
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self.assertIsInstance(pattern, lazy_regex.LazyRegex)
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self.assertTrue(pattern.match('foo'))
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self.assertTrue(pattern.match('Foo'))
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def test_findall(self):
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pattern = lazy_regex.lazy_compile('fo*')
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self.assertEqual(['f', 'fo', 'foo', 'fooo'],
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pattern.findall('f fo foo fooo'))
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def test_finditer(self):
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pattern = lazy_regex.lazy_compile('fo*')
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matches = [(m.start(), m.end(), m.group())
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for m in pattern.finditer('foo bar fop')]
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self.assertEqual([(0, 3, 'foo'), (8, 10, 'fo')], matches)
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def test_match(self):
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pattern = lazy_regex.lazy_compile('fo*')
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self.assertIs(None, pattern.match('baz foo'))
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self.assertEqual('fooo', pattern.match('fooo').group())
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def test_search(self):
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pattern = lazy_regex.lazy_compile('fo*')
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self.assertEqual('foo', pattern.search('baz foo').group())
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self.assertEqual('fooo', pattern.search('fooo').group())
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def test_split(self):
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pattern = lazy_regex.lazy_compile('[,;]+')
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self.assertEqual(['x', 'y', 'z'], pattern.split('x,y;z'))
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def test_pickle(self):
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# When pickling, just compile the regex.
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# Sphinx, which we use for documentation, pickles
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# some compiled regexes.
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lazy_pattern = lazy_regex.lazy_compile('[,;]+')
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pickled = pickle.dumps(lazy_pattern)
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unpickled_lazy_pattern = pickle.loads(pickled)
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['x', 'y', 'z'], unpickled_lazy_pattern.split('x,y;z'))