view tests/test-simplemerge.py @ 40093:726cfc47f17a

contrib: add an utility module to parse test scripts

This patch centralizes the logic to pick up code fragments embedded in
*.t script, in order to:

  - apply checking with patterns in check-code.py on such embedded
    code fragments

    Now, check-code.py completely ignores embedded code
    fragments. I'll post another patch series to check them.

  - replace similar code path in contrib/import-checker.py

    Current import-checker.py has problems below. Fixing each of them
    is a little difficult, because parsing logic and pattern strings
    are tightly coupled.

    - overlook (or mis-detect) the end of inline script in doctest
      style

      8a8dd6e4a97a fixed a part of this issue, but not enough.

    - it overlooks inline script in doctest style at the end of file
      (and ignores invalid un-closed heredoc at the end of file, too)

    - it overlooks code fragment in styles below
      - "python <<EOF" (heredoc should be "cat > file <<EOF" style)
      - "cat > foobar.py << ANYLIMIT" (limit mark should be "EOF")
      - "cat << EOF > foobar.py" (filename should be placed before limit mark)
      - "cat >> foobar.py << EOF" (appending is ignored)

    - it is not extensible for other than python code fragments
      (e.g. shell script, hgrc file, and so on)

This new module can detect python code fragments in styles below:

  - inline script in doctest style (starting by "  >>> " line)
  - python invocation with heredoc script ("python <<EOF")
  - python script in heredoc style (redirected into ".py" file)

As an example of extensibility of new module, this patch also contains
implementation to pick up code fragment below. This will be useful to
add additional restriction for them, for example.

  - shell script in heredoc style (redirected into ".sh" file)
  - hgrc configuration in heredoc style (redirected into hgrc or $HGRCPATH)

# Copyright (C) 2004, 2005 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, see <http://www.gnu.org/licenses/>.

from __future__ import absolute_import

import unittest
from mercurial import (
    error,
    simplemerge,
    util,
)

from mercurial.utils import (
    stringutil,
)

TestCase = unittest.TestCase
# bzr compatible interface, for the tests
class Merge3(simplemerge.Merge3Text):
    """3-way merge of texts.

    Given BASE, OTHER, THIS, tries to produce a combined text
    incorporating the changes from both BASE->OTHER and BASE->THIS.
    All three will typically be sequences of lines."""
    def __init__(self, base, a, b):
        basetext = b'\n'.join([i.strip(b'\n') for i in base] + [b''])
        atext = b'\n'.join([i.strip(b'\n') for i in a] + [b''])
        btext = b'\n'.join([i.strip(b'\n') for i in b] + [b''])
        if (stringutil.binary(basetext) or stringutil.binary(atext)
            or stringutil.binary(btext)):
            raise error.Abort(b"don't know how to merge binary files")
        simplemerge.Merge3Text.__init__(self, basetext, atext, btext,
                                        base, a, b)

CantReprocessAndShowBase = simplemerge.CantReprocessAndShowBase

def split_lines(t):
    return util.stringio(t).readlines()

############################################################
# test case data from the gnu diffutils manual
# common base
TZU = split_lines(b"""     The Nameless is the origin of Heaven and Earth;
     The named is the mother of all things.

     Therefore let there always be non-being,
       so we may see their subtlety,
     And let there always be being,
       so we may see their outcome.
     The two are the same,
     But after they are produced,
       they have different names.
     They both may be called deep and profound.
     Deeper and more profound,
     The door of all subtleties!
""")

LAO = split_lines(b"""     The Way that can be told of is not the eternal Way;
     The name that can be named is not the eternal name.
     The Nameless is the origin of Heaven and Earth;
     The Named is the mother of all things.
     Therefore let there always be non-being,
       so we may see their subtlety,
     And let there always be being,
       so we may see their outcome.
     The two are the same,
     But after they are produced,
       they have different names.
""")


TAO = split_lines(b"""     The Way that can be told of is not the eternal Way;
     The name that can be named is not the eternal name.
     The Nameless is the origin of Heaven and Earth;
     The named is the mother of all things.

     Therefore let there always be non-being,
       so we may see their subtlety,
     And let there always be being,
       so we may see their result.
     The two are the same,
     But after they are produced,
       they have different names.

       -- The Way of Lao-Tzu, tr. Wing-tsit Chan

""")

MERGED_RESULT = split_lines(b"""\
     The Way that can be told of is not the eternal Way;
     The name that can be named is not the eternal name.
     The Nameless is the origin of Heaven and Earth;
     The Named is the mother of all things.
     Therefore let there always be non-being,
       so we may see their subtlety,
     And let there always be being,
       so we may see their result.
     The two are the same,
     But after they are produced,
       they have different names.\
\n<<<<<<< LAO\
\n=======

       -- The Way of Lao-Tzu, tr. Wing-tsit Chan
\
\n>>>>>>> TAO
""")

class TestMerge3(TestCase):
    def log(self, msg):
        pass

    def test_no_changes(self):
        """No conflicts because nothing changed"""
        m3 = Merge3([b'aaa', b'bbb'],
                    [b'aaa', b'bbb'],
                    [b'aaa', b'bbb'])

        self.assertEqual(m3.find_unconflicted(),
                         [(0, 2)])

        self.assertEqual(list(m3.find_sync_regions()),
                         [(0, 2,
                           0, 2,
                           0, 2),
                          (2, 2,  2, 2,  2, 2)])

        self.assertEqual(list(m3.merge_regions()),
                         [(b'unchanged', 0, 2)])

        self.assertEqual(list(m3.merge_groups()),
                         [(b'unchanged', [b'aaa', b'bbb'])])

    def test_front_insert(self):
        m3 = Merge3([b'zz'],
                    [b'aaa', b'bbb', b'zz'],
                    [b'zz'])

        # todo: should use a sentinel at end as from get_matching_blocks
        # to match without zz
        self.assertEqual(list(m3.find_sync_regions()),
                         [(0, 1,  2, 3,  0, 1),
                          (1, 1,  3, 3,  1, 1)])

        self.assertEqual(list(m3.merge_regions()),
                         [(b'a', 0, 2),
                          (b'unchanged', 0, 1)])

        self.assertEqual(list(m3.merge_groups()),
                         [(b'a', [b'aaa', b'bbb']),
                          (b'unchanged', [b'zz'])])

    def test_null_insert(self):
        m3 = Merge3([],
                    [b'aaa', b'bbb'],
                    [])
        # todo: should use a sentinel at end as from get_matching_blocks
        # to match without zz
        self.assertEqual(list(m3.find_sync_regions()),
                         [(0, 0,  2, 2,  0, 0)])

        self.assertEqual(list(m3.merge_regions()),
                         [(b'a', 0, 2)])

        self.assertEqual(list(m3.merge_lines()),
                         [b'aaa', b'bbb'])

    def test_no_conflicts(self):
        """No conflicts because only one side changed"""
        m3 = Merge3([b'aaa', b'bbb'],
                    [b'aaa', b'111', b'bbb'],
                    [b'aaa', b'bbb'])

        self.assertEqual(m3.find_unconflicted(),
                         [(0, 1), (1, 2)])

        self.assertEqual(list(m3.find_sync_regions()),
                         [(0, 1,  0, 1,  0, 1),
                          (1, 2,  2, 3,  1, 2),
                          (2, 2,  3, 3,  2, 2)])

        self.assertEqual(list(m3.merge_regions()),
                         [(b'unchanged', 0, 1),
                          (b'a', 1, 2),
                          (b'unchanged', 1, 2)])

    def test_append_a(self):
        m3 = Merge3([b'aaa\n', b'bbb\n'],
                    [b'aaa\n', b'bbb\n', b'222\n'],
                    [b'aaa\n', b'bbb\n'])

        self.assertEqual(b''.join(m3.merge_lines()),
                         b'aaa\nbbb\n222\n')

    def test_append_b(self):
        m3 = Merge3([b'aaa\n', b'bbb\n'],
                    [b'aaa\n', b'bbb\n'],
                    [b'aaa\n', b'bbb\n', b'222\n'])

        self.assertEqual(b''.join(m3.merge_lines()),
                         b'aaa\nbbb\n222\n')

    def test_append_agreement(self):
        m3 = Merge3([b'aaa\n', b'bbb\n'],
                    [b'aaa\n', b'bbb\n', b'222\n'],
                    [b'aaa\n', b'bbb\n', b'222\n'])

        self.assertEqual(b''.join(m3.merge_lines()),
                         b'aaa\nbbb\n222\n')

    def test_append_clash(self):
        m3 = Merge3([b'aaa\n', b'bbb\n'],
                    [b'aaa\n', b'bbb\n', b'222\n'],
                    [b'aaa\n', b'bbb\n', b'333\n'])

        ml = m3.merge_lines(name_a=b'a',
                            name_b=b'b',
                            start_marker=b'<<',
                            mid_marker=b'--',
                            end_marker=b'>>')
        self.assertEqual(b''.join(ml),
                         b'aaa\n'
                         b'bbb\n'
                         b'<< a\n'
                         b'222\n'
                         b'--\n'
                         b'333\n'
                         b'>> b\n'
                         )

    def test_insert_agreement(self):
        m3 = Merge3([b'aaa\n', b'bbb\n'],
                    [b'aaa\n', b'222\n', b'bbb\n'],
                    [b'aaa\n', b'222\n', b'bbb\n'])

        ml = m3.merge_lines(name_a=b'a',
                            name_b=b'b',
                            start_marker=b'<<',
                            mid_marker=b'--',
                            end_marker=b'>>')
        self.assertEqual(b''.join(ml), b'aaa\n222\nbbb\n')


    def test_insert_clash(self):
        """Both try to insert lines in the same place."""
        m3 = Merge3([b'aaa\n', b'bbb\n'],
                    [b'aaa\n', b'111\n', b'bbb\n'],
                    [b'aaa\n', b'222\n', b'bbb\n'])

        self.assertEqual(m3.find_unconflicted(),
                         [(0, 1), (1, 2)])

        self.assertEqual(list(m3.find_sync_regions()),
                         [(0, 1,  0, 1,  0, 1),
                          (1, 2,  2, 3,  2, 3),
                          (2, 2,  3, 3,  3, 3)])

        self.assertEqual(list(m3.merge_regions()),
                         [(b'unchanged', 0, 1),
                          (b'conflict', 1, 1,  1, 2,  1, 2),
                          (b'unchanged', 1, 2)])

        self.assertEqual(list(m3.merge_groups()),
                         [(b'unchanged', [b'aaa\n']),
                          (b'conflict', [], [b'111\n'], [b'222\n']),
                          (b'unchanged', [b'bbb\n']),
                          ])

        ml = m3.merge_lines(name_a=b'a',
                            name_b=b'b',
                            start_marker=b'<<',
                            mid_marker=b'--',
                            end_marker=b'>>')
        self.assertEqual(b''.join(ml),
b'''aaa
<< a
111
--
222
>> b
bbb
''')

    def test_replace_clash(self):
        """Both try to insert lines in the same place."""
        m3 = Merge3([b'aaa', b'000', b'bbb'],
                    [b'aaa', b'111', b'bbb'],
                    [b'aaa', b'222', b'bbb'])

        self.assertEqual(m3.find_unconflicted(),
                         [(0, 1), (2, 3)])

        self.assertEqual(list(m3.find_sync_regions()),
                         [(0, 1,  0, 1,  0, 1),
                           (2, 3,  2, 3,  2, 3),
                           (3, 3,  3, 3,  3, 3)])

    def test_replace_multi(self):
        """Replacement with regions of different size."""
        m3 = Merge3([b'aaa', b'000', b'000', b'bbb'],
                    [b'aaa', b'111', b'111', b'111', b'bbb'],
                    [b'aaa', b'222', b'222', b'222', b'222', b'bbb'])

        self.assertEqual(m3.find_unconflicted(),
                         [(0, 1), (3, 4)])


        self.assertEqual(list(m3.find_sync_regions()),
                         [(0, 1,  0, 1,  0, 1),
                          (3, 4,  4, 5,  5, 6),
                          (4, 4,  5, 5,  6, 6)])

    def test_merge_poem(self):
        """Test case from diff3 manual"""
        m3 = Merge3(TZU, LAO, TAO)
        ml = list(m3.merge_lines(b'LAO', b'TAO'))
        self.log(b'merge result:')
        self.log(b''.join(ml))
        self.assertEqual(ml, MERGED_RESULT)

    def test_binary(self):
        with self.assertRaises(error.Abort):
            Merge3([b'\x00'], [b'a'], [b'b'])

    def test_dos_text(self):
        base_text = b'a\r\n'
        this_text = b'b\r\n'
        other_text = b'c\r\n'
        m3 = Merge3(base_text.splitlines(True), other_text.splitlines(True),
                    this_text.splitlines(True))
        m_lines = m3.merge_lines(b'OTHER', b'THIS')
        self.assertEqual(b'<<<<<<< OTHER\r\nc\r\n=======\r\nb\r\n'
                         b'>>>>>>> THIS\r\n'.splitlines(True), list(m_lines))

    def test_mac_text(self):
        base_text = b'a\r'
        this_text = b'b\r'
        other_text = b'c\r'
        m3 = Merge3(base_text.splitlines(True), other_text.splitlines(True),
                    this_text.splitlines(True))
        m_lines = m3.merge_lines(b'OTHER', b'THIS')
        self.assertEqual(b'<<<<<<< OTHER\rc\r=======\rb\r'
                         b'>>>>>>> THIS\r'.splitlines(True), list(m_lines))

if __name__ == '__main__':
    # hide the timer
    import time
    orig = time.time
    try:
        time.time = lambda: 0
        unittest.main()
    finally:
        time.time = orig