/brz/remove-bazaar

# Copyright (C) 2006, 2011 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Test that lazy regexes are not compiled right away"""

import pickle

import re

from .. import errors

from .. import (

    lazy_regex,

    tests,

    )

class TestErrors(tests.TestCase):

    def test_invalid_pattern(self):

        error = lazy_regex.InvalidPattern('Bad pattern msg.')

        self.assertEqualDiff("Invalid pattern(s) found. Bad pattern msg.",

                             str(error))

class InstrumentedLazyRegex(lazy_regex.LazyRegex):

    """Keep track of actions on the lazy regex"""

    _actions = []

    @classmethod

    def use_actions(cls, actions):

        cls._actions = actions

    def __getattr__(self, attr):

        self._actions.append(('__getattr__', attr))

        return super(InstrumentedLazyRegex, self).__getattr__(attr)

    def _real_re_compile(self, *args, **kwargs):

        self._actions.append(('_real_re_compile', args, kwargs))

        return super(InstrumentedLazyRegex, self)._real_re_compile(

            *args, **kwargs)

class TestLazyRegex(tests.TestCase):

    def test_lazy_compile(self):

        """Make sure that LazyRegex objects compile at the right time"""

        actions = []

        InstrumentedLazyRegex.use_actions(actions)

        pattern = InstrumentedLazyRegex(args=('foo',), kwargs={})

        actions.append(('created regex', 'foo'))

        # This match call should compile the regex and go through __getattr__

        pattern.match('foo')

        # But a further call should not go through __getattr__ because it has

        # been bound locally.

        pattern.match('foo')

        self.assertEqual([('created regex', 'foo'),

                          ('__getattr__', 'match'),

                          ('_real_re_compile', ('foo',), {}),

                          ], actions)

    def test_bad_pattern(self):

        """Ensure lazy regex handles bad patterns cleanly."""

        p = lazy_regex.lazy_compile('RE:[')

        # As p.match is lazy, we make it into a lambda so its handled

        # by assertRaises correctly.

        e = self.assertRaises(lazy_regex.InvalidPattern,

                              lambda: p.match('foo'))

        # Expect either old or new form of error message

        self.assertContainsRe(e.msg, '^"RE:\\[" '

                              '(unexpected end of regular expression'

                              '|unterminated character set at position 3)$')

class TestLazyCompile(tests.TestCase):

    def test_simple_acts_like_regex(self):

        """Test that the returned object has basic regex like functionality"""

        pattern = lazy_regex.lazy_compile('foo')

        self.assertIsInstance(pattern, lazy_regex.LazyRegex)

        self.assertTrue(pattern.match('foo'))

        self.assertIs(None, pattern.match('bar'))

    def test_extra_args(self):

        """Test that extra arguments are also properly passed"""

        pattern = lazy_regex.lazy_compile('foo', re.I)

        self.assertIsInstance(pattern, lazy_regex.LazyRegex)

        self.assertTrue(pattern.match('foo'))

        self.assertTrue(pattern.match('Foo'))

    def test_findall(self):

        pattern = lazy_regex.lazy_compile('fo*')

        self.assertEqual(['f', 'fo', 'foo', 'fooo'],

                         pattern.findall('f fo foo fooo'))

    def test_finditer(self):

        pattern = lazy_regex.lazy_compile('fo*')

        matches = [(m.start(), m.end(), m.group())

                   for m in pattern.finditer('foo bar fop')]

        self.assertEqual([(0, 3, 'foo'), (8, 10, 'fo')], matches)

    def test_match(self):

        pattern = lazy_regex.lazy_compile('fo*')

        self.assertIs(None, pattern.match('baz foo'))

        self.assertEqual('fooo', pattern.match('fooo').group())

    def test_search(self):

        pattern = lazy_regex.lazy_compile('fo*')

        self.assertEqual('foo', pattern.search('baz foo').group())

        self.assertEqual('fooo', pattern.search('fooo').group())

    def test_split(self):

        pattern = lazy_regex.lazy_compile('[,;]+')

        self.assertEqual(['x', 'y', 'z'], pattern.split('x,y;z'))

    def test_pickle(self):

        # When pickling, just compile the regex.

        # Sphinx, which we use for documentation, pickles

        # some compiled regexes.

        lazy_pattern = lazy_regex.lazy_compile('[,;]+')

        pickled = pickle.dumps(lazy_pattern)

        unpickled_lazy_pattern = pickle.loads(pickled)

        self.assertEqual(

            ['x', 'y', 'z'], unpickled_lazy_pattern.split('x,y;z'))