Mercurial > hg
view tests/test-bdiff.py @ 51711:832a1aeb576f
pytype: only try the hacky way of finding PYTHON if not provided
This allows us to work in more environments, like when using pyenv. This
syntax is compatible with all POSIX shells.
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Tue, 23 Jul 2024 12:10:31 +0200 |
parents | 6000f5b25c9b |
children |
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import collections import struct import unittest from mercurial import mdiff class diffreplace(collections.namedtuple('diffreplace', 'start end from_ to')): def __repr__(self): return 'diffreplace(%r, %r, %r, %r)' % self class BdiffTests(unittest.TestCase): def assert_bdiff_applies(self, a, b): d = mdiff.textdiff(a, b) c = a if d: c = mdiff.patches(a, [d]) self.assertEqual( c, b, ( "bad diff+patch result from\n %r to\n " "%r: \nbdiff: %r\npatched: %r" % (a, b, d, c[:200]) ), ) def assert_bdiff(self, a, b): self.assert_bdiff_applies(a, b) self.assert_bdiff_applies(b, a) def test_bdiff_basic(self): cases = [ (b"a\nc\n\n\n\n", b"a\nb\n\n\n"), (b"a\nb\nc\n", b"a\nc\n"), (b"", b""), (b"a\nb\nc", b"a\nb\nc"), (b"a\nb\nc\nd\n", b"a\nd\n"), (b"a\nb\nc\nd\n", b"a\nc\ne\n"), (b"a\nb\nc\n", b"a\nc\n"), (b"a\n", b"c\na\nb\n"), (b"a\n", b""), (b"a\n", b"b\nc\n"), (b"a\n", b"c\na\n"), (b"", b"adjfkjdjksdhfksj"), (b"", b"ab"), (b"", b"abc"), (b"a", b"a"), (b"ab", b"ab"), (b"abc", b"abc"), (b"a\n", b"a\n"), (b"a\nb", b"a\nb"), ] for a, b in cases: self.assert_bdiff(a, b) def showdiff(self, a, b): bin = mdiff.textdiff(a, b) pos = 0 q = 0 actions = [] while pos < len(bin): p1, p2, l = struct.unpack(">lll", bin[pos : pos + 12]) pos += 12 if p1: actions.append(a[q:p1]) actions.append(diffreplace(p1, p2, a[p1:p2], bin[pos : pos + l])) pos += l q = p2 if q < len(a): actions.append(a[q:]) return actions def test_issue1295(self): cases = [ ( b"x\n\nx\n\nx\n\nx\n\nz\n", b"x\n\nx\n\ny\n\nx\n\nx\n\nz\n", [ b'x\n\nx\n\n', diffreplace(6, 6, b'', b'y\n\n'), b'x\n\nx\n\nz\n', ], ), ( 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", [ b'x\n\nx\n\n', diffreplace(6, 6, b'', b'y\n\n'), b'x\n\n', diffreplace(9, 9, b'', b'y\n\n'), b'x\n\nz\n', ], ), ] for old, new, want in cases: self.assertEqual(self.showdiff(old, new), want) def test_issue1295_varies_on_pure(self): # we should pick up abbbc. rather than bc.de as the longest match got = self.showdiff( b"a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n", b"a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n", ) want_c = [ b'a\nb\nb\n', diffreplace(6, 6, b'', b'a\nb\nb\nb\nc\n.\n'), b'b\nc\n.\nd\ne\n', diffreplace(16, 18, b'.\n', b''), b'f\n', ] want_pure = [ diffreplace(0, 0, b'', b'a\nb\nb\n'), b'a\nb\nb\nb\nc\n.\n', diffreplace(12, 12, b'', b'b\nc\n.\n'), b'd\ne\n', diffreplace(16, 18, b'.\n', b''), b'f\n', ] self.assertTrue( got in (want_c, want_pure), 'got: %r, wanted either %r or %r' % (got, want_c, want_pure), ) def test_fixws(self): cases = [ (b" \ta\r b\t\n", b"ab\n", 1), (b" \ta\r b\t\n", b" a b\n", 0), (b"", b"", 1), (b"", b"", 0), ] for a, b, allws in cases: c = mdiff.fixws(a, allws) self.assertEqual( c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws) ) def test_nice_diff_for_trivial_change(self): self.assertEqual( self.showdiff( b''.join(b'<%d\n-\n' % i for i in range(5)), b''.join(b'>%d\n-\n' % i for i in range(5)), ), [ diffreplace(0, 3, b'<0\n', b'>0\n'), b'-\n', diffreplace(5, 8, b'<1\n', b'>1\n'), b'-\n', diffreplace(10, 13, b'<2\n', b'>2\n'), b'-\n', diffreplace(15, 18, b'<3\n', b'>3\n'), b'-\n', diffreplace(20, 23, b'<4\n', b'>4\n'), b'-\n', ], ) def test_prefer_appending(self): # 1 line to 3 lines self.assertEqual( self.showdiff(b'a\n', b'a\n' * 3), [b'a\n', diffreplace(2, 2, b'', b'a\na\n')], ) # 1 line to 5 lines self.assertEqual( self.showdiff(b'a\n', b'a\n' * 5), [b'a\n', diffreplace(2, 2, b'', b'a\na\na\na\n')], ) def test_prefer_removing_trailing(self): # 3 lines to 1 line self.assertEqual( self.showdiff(b'a\n' * 3, b'a\n'), [b'a\n', diffreplace(2, 6, b'a\na\n', b'')], ) # 5 lines to 1 line self.assertEqual( self.showdiff(b'a\n' * 5, b'a\n'), [b'a\n', diffreplace(2, 10, b'a\na\na\na\n', b'')], ) if __name__ == '__main__': import silenttestrunner silenttestrunner.main(__name__)