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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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import silenttestrunner
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from mercurial import (
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bdiff,
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mpatch,
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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 = bdiff.bdiff(a, b)
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c = a
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if d:
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c = mpatch.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 = bdiff.bdiff(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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# we should pick up abbbc. rather than bc.de as the longest match
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("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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['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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]
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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_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 = bdiff.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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silenttestrunner.main(__name__)
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