tests/test-bdiff.py
author Gregory Szorc <gregory.szorc@gmail.com>
Sun, 29 Sep 2019 10:37:38 -0700
changeset 43015 dffa9d3c2491
parent 39789 e961f18a0094
child 43076 2372284d9457
permissions -rw-r--r--
automation: install awscli and python3-boto3 packages This provides the `aws` command-line utility as well as a Python library for interacting with AWS. It is useful to have these packages installed in AMIs so you can easily interact with other AWS services. Differential Revision: https://phab.mercurial-scm.org/D6914
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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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            (b"a\nc\n\n\n\n", b"a\nb\n\n\n"),
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            (b"a\nb\nc\n", b"a\nc\n"),
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            (b"", b""),
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            (b"a\nb\nc", b"a\nb\nc"),
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            (b"a\nb\nc\nd\n", b"a\nd\n"),
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            (b"a\nb\nc\nd\n", b"a\nc\ne\n"),
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            (b"a\nb\nc\n", b"a\nc\n"),
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            (b"a\n", b"c\na\nb\n"),
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            (b"a\n", b""),
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            (b"a\n", b"b\nc\n"),
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            (b"a\n", b"c\na\n"),
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            (b"", b"adjfkjdjksdhfksj"),
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            (b"", b"ab"),
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            (b"", b"abc"),
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            (b"a", b"a"),
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            (b"ab", b"ab"),
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            (b"abc", b"abc"),
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            (b"a\n", b"a\n"),
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            (b"a\nb", b"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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            (b"x\n\nx\n\nx\n\nx\n\nz\n", b"x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
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             [b'x\n\nx\n\n',
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              diffreplace(6, 6, b'', b'y\n\n'),
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              b'x\n\nx\n\nz\n']),
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            (b"x\n\nx\n\nx\n\nx\n\nz\n", b"x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
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             [b'x\n\nx\n\n',
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              diffreplace(6, 6, b'', b'y\n\n'),
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              b'x\n\n',
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              diffreplace(9, 9, b'', b'y\n\n'),
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              b'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(b"a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
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                            b"a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n")
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        want_c = [b'a\nb\nb\n',
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                  diffreplace(6, 6, b'', b'a\nb\nb\nb\nc\n.\n'),
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                  b'b\nc\n.\nd\ne\n',
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                  diffreplace(16, 18, b'.\n', b''),
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                  b'f\n']
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        want_pure = [diffreplace(0, 0, b'', b'a\nb\nb\n'),
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                     b'a\nb\nb\nb\nc\n.\n',
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                     diffreplace(12, 12, b'', b'b\nc\n.\n'),
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                     b'd\ne\n',
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                     diffreplace(16, 18, b'.\n', b''), b'f\n']
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        self.assertTrue(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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            (b" \ta\r b\t\n", b"ab\n", 1),
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            (b" \ta\r b\t\n", b" a b\n", 0),
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            (b"", b"", 1),
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            (b"", b"", 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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            b''.join(b'<%d\n-\n' % i for i in range(5)),
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            b''.join(b'>%d\n-\n' % i for i in range(5))),
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                         [diffreplace(0, 3, b'<0\n', b'>0\n'),
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                          b'-\n',
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                          diffreplace(5, 8, b'<1\n', b'>1\n'),
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                          b'-\n',
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                          diffreplace(10, 13, b'<2\n', b'>2\n'),
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                          b'-\n',
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                          diffreplace(15, 18, b'<3\n', b'>3\n'),
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                          b'-\n',
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                          diffreplace(20, 23, b'<4\n', b'>4\n'),
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                          b'-\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(b'a\n', b'a\n' * 3),
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                         [b'a\n', diffreplace(2, 2, b'', b'a\na\n')])
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        # 1 line to 5 lines
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        self.assertEqual(self.showdiff(b'a\n', b'a\n' * 5),
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                         [b'a\n', diffreplace(2, 2, b'', b'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(b'a\n' * 3, b'a\n'),
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                         [b'a\n', diffreplace(2, 6, b'a\na\n', b'')])
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        # 5 lines to 1 line
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        self.assertEqual(self.showdiff(b'a\n' * 5, b'a\n'),
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                         [b'a\n', diffreplace(2, 10, b'a\na\na\na\n', b'')])
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if __name__ == '__main__':
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    import silenttestrunner
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    silenttestrunner.main(__name__)