tests/test-bdiff.py
author Gregory Szorc <gregory.szorc@gmail.com>
Thu, 02 Aug 2018 09:53:22 -0700
changeset 38886 66cf046ef60f
parent 32203 0c73634d0570
child 39787 e05d7c71f209
permissions -rw-r--r--
changegroup: move revchunk() from narrow The monkeypatched revchunk for ellipses serving is a completely independent implementation. We model it as such in the changegroup code. revchunk() is now a simple proxy function. Again, I wish we had better APIs here. Especially since this narrow code is part of cg1packer and cg1packer can't be used with narrow. Class inheritance is wonky. And I will definitely be making changes to changegroup code for delta generation. As part of the code move, `node.nullrev` was replaced by `nullrev`. And a reference to `orig` was replaced to call `self._revchunknormal` directly. Differential Revision: https://phab.mercurial-scm.org/D4063
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from __future__ import absolute_import, print_function
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import collections
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import struct
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import unittest
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from mercurial import (
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    mdiff,
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)
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class diffreplace(
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    collections.namedtuple('diffreplace', 'start end from_ to')):
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    def __repr__(self):
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        return 'diffreplace(%r, %r, %r, %r)' % self
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class BdiffTests(unittest.TestCase):
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    def assert_bdiff_applies(self, a, b):
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        d = mdiff.textdiff(a, b)
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        c = a
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        if d:
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            c = mdiff.patches(a, [d])
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        self.assertEqual(
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            c, b, ("bad diff+patch result from\n  %r to\n  "
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                   "%r: \nbdiff: %r\npatched: %r" % (a, b, d, c[:200])))
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    def assert_bdiff(self, a, b):
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        self.assert_bdiff_applies(a, b)
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        self.assert_bdiff_applies(b, a)
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    def test_bdiff_basic(self):
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        cases = [
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            ("a\nc\n\n\n\n", "a\nb\n\n\n"),
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            ("a\nb\nc\n", "a\nc\n"),
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            ("", ""),
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            ("a\nb\nc", "a\nb\nc"),
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            ("a\nb\nc\nd\n", "a\nd\n"),
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            ("a\nb\nc\nd\n", "a\nc\ne\n"),
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            ("a\nb\nc\n", "a\nc\n"),
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            ("a\n", "c\na\nb\n"),
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            ("a\n", ""),
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            ("a\n", "b\nc\n"),
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            ("a\n", "c\na\n"),
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            ("", "adjfkjdjksdhfksj"),
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            ("", "ab"),
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            ("", "abc"),
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            ("a", "a"),
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            ("ab", "ab"),
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            ("abc", "abc"),
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            ("a\n", "a\n"),
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            ("a\nb", "a\nb"),
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        ]
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        for a, b in cases:
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            self.assert_bdiff(a, b)
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    def showdiff(self, a, b):
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        bin = mdiff.textdiff(a, b)
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        pos = 0
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        q = 0
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        actions = []
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        while pos < len(bin):
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            p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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            pos += 12
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            if p1:
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                actions.append(a[q:p1])
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            actions.append(diffreplace(p1, p2, a[p1:p2], bin[pos:pos + l]))
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            pos += l
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            q = p2
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        if q < len(a):
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            actions.append(a[q:])
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        return actions
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    def test_issue1295(self):
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        cases = [
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            ("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
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             ['x\n\nx\n\n', diffreplace(6, 6, '', 'y\n\n'), 'x\n\nx\n\nz\n']),
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            ("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
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             ['x\n\nx\n\n',
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              diffreplace(6, 6, '', 'y\n\n'),
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              'x\n\n',
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              diffreplace(9, 9, '', 'y\n\n'),
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              'x\n\nz\n']),
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        ]
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        for old, new, want in cases:
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            self.assertEqual(self.showdiff(old, new), want)
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    def test_issue1295_varies_on_pure(self):
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            # we should pick up abbbc. rather than bc.de as the longest match
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        got = self.showdiff("a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
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                            "a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n")
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        want_c = ['a\nb\nb\n',
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                  diffreplace(6, 6, '', 'a\nb\nb\nb\nc\n.\n'),
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                  'b\nc\n.\nd\ne\n',
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                  diffreplace(16, 18, '.\n', ''),
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                  'f\n']
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        want_pure = [diffreplace(0, 0, '', 'a\nb\nb\n'),
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                     'a\nb\nb\nb\nc\n.\n',
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                     diffreplace(12, 12, '', 'b\nc\n.\n'),
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                     'd\ne\n',
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                     diffreplace(16, 18, '.\n', ''), 'f\n']
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        self.assert_(got in (want_c, want_pure),
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                     'got: %r, wanted either %r or %r' % (
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                         got, want_c, want_pure))
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    def test_fixws(self):
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        cases = [
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            (" \ta\r b\t\n", "ab\n", 1),
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            (" \ta\r b\t\n", " a b\n", 0),
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            ("", "", 1),
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            ("", "", 0),
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        ]
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        for a, b, allws in cases:
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            c = mdiff.fixws(a, allws)
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            self.assertEqual(
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                c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws))
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    def test_nice_diff_for_trivial_change(self):
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        self.assertEqual(self.showdiff(
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            ''.join('<%s\n-\n' % i for i in range(5)),
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            ''.join('>%s\n-\n' % i for i in range(5))),
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                         [diffreplace(0, 3, '<0\n', '>0\n'),
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                          '-\n',
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                          diffreplace(5, 8, '<1\n', '>1\n'),
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                          '-\n',
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                          diffreplace(10, 13, '<2\n', '>2\n'),
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                          '-\n',
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                          diffreplace(15, 18, '<3\n', '>3\n'),
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                          '-\n',
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                          diffreplace(20, 23, '<4\n', '>4\n'),
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                          '-\n'])
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    def test_prefer_appending(self):
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        # 1 line to 3 lines
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        self.assertEqual(self.showdiff('a\n', 'a\n' * 3),
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                         ['a\n', diffreplace(2, 2, '', 'a\na\n')])
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        # 1 line to 5 lines
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        self.assertEqual(self.showdiff('a\n', 'a\n' * 5),
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                         ['a\n', diffreplace(2, 2, '', 'a\na\na\na\n')])
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    def test_prefer_removing_trailing(self):
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        # 3 lines to 1 line
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        self.assertEqual(self.showdiff('a\n' * 3, 'a\n'),
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                         ['a\n', diffreplace(2, 6, 'a\na\n', '')])
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        # 5 lines to 1 line
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        self.assertEqual(self.showdiff('a\n' * 5, 'a\n'),
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                         ['a\n', diffreplace(2, 10, 'a\na\na\na\n', '')])
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if __name__ == '__main__':
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    import silenttestrunner
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    silenttestrunner.main(__name__)