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import difflib
from test.support import run_unittest, findfile
import unittest
import doctest
import sys
class TestWithAscii(unittest.TestCase):
def test_one_insert(self):
sm = difflib.SequenceMatcher(None, 'b' * 100, 'a' + 'b' * 100)
self.assertAlmostEqual(sm.ratio(), 0.995, places=3)
self.assertEqual(list(sm.get_opcodes()),
[ ('insert', 0, 0, 0, 1),
('equal', 0, 100, 1, 101)])
sm = difflib.SequenceMatcher(None, 'b' * 100, 'b' * 50 + 'a' + 'b' * 50)
self.assertAlmostEqual(sm.ratio(), 0.995, places=3)
self.assertEqual(list(sm.get_opcodes()),
[ ('equal', 0, 50, 0, 50),
('insert', 50, 50, 50, 51),
('equal', 50, 100, 51, 101)])
def test_one_delete(self):
sm = difflib.SequenceMatcher(None, 'a' * 40 + 'c' + 'b' * 40, 'a' * 40 + 'b' * 40)
self.assertAlmostEqual(sm.ratio(), 0.994, places=3)
self.assertEqual(list(sm.get_opcodes()),
[ ('equal', 0, 40, 0, 40),
('delete', 40, 41, 40, 40),
('equal', 41, 81, 40, 80)])
class TestAutojunk(unittest.TestCase):
"""Tests for the autojunk parameter added in 2.7"""
def test_one_insert_homogenous_sequence(self):
# By default autojunk=True and the heuristic kicks in for a sequence
# of length 200+
seq1 = 'b' * 200
seq2 = 'a' + 'b' * 200
sm = difflib.SequenceMatcher(None, seq1, seq2)
self.assertAlmostEqual(sm.ratio(), 0, places=3)
# Now turn the heuristic off
sm = difflib.SequenceMatcher(None, seq1, seq2, autojunk=False)
self.assertAlmostEqual(sm.ratio(), 0.9975, places=3)
class TestSFbugs(unittest.TestCase):
def test_ratio_for_null_seqn(self):
# Check clearing of SF bug 763023
s = difflib.SequenceMatcher(None, [], [])
self.assertEqual(s.ratio(), 1)
self.assertEqual(s.quick_ratio(), 1)
self.assertEqual(s.real_quick_ratio(), 1)
def test_comparing_empty_lists(self):
# Check fix for bug #979794
group_gen = difflib.SequenceMatcher(None, [], []).get_grouped_opcodes()
self.assertRaises(StopIteration, next, group_gen)
diff_gen = difflib.unified_diff([], [])
self.assertRaises(StopIteration, next, diff_gen)
def test_added_tab_hint(self):
# Check fix for bug #1488943
diff = list(difflib.Differ().compare(["\tI am a buggy"],["\t\tI am a bug"]))
self.assertEqual("- \tI am a buggy", diff[0])
self.assertEqual("? --\n", diff[1])
self.assertEqual("+ \t\tI am a bug", diff[2])
self.assertEqual("? +\n", diff[3])
patch914575_from1 = """
1. Beautiful is beTTer than ugly.
2. Explicit is better than implicit.
3. Simple is better than complex.
4. Complex is better than complicated.
"""
patch914575_to1 = """
1. Beautiful is better than ugly.
3. Simple is better than complex.
4. Complicated is better than complex.
5. Flat is better than nested.
"""
patch914575_from2 = """
\t\tLine 1: preceeded by from:[tt] to:[ssss]
\t\tLine 2: preceeded by from:[sstt] to:[sssst]
\t \tLine 3: preceeded by from:[sstst] to:[ssssss]
Line 4: \thas from:[sst] to:[sss] after :
Line 5: has from:[t] to:[ss] at end\t
"""
patch914575_to2 = """
Line 1: preceeded by from:[tt] to:[ssss]
\tLine 2: preceeded by from:[sstt] to:[sssst]
Line 3: preceeded by from:[sstst] to:[ssssss]
Line 4: has from:[sst] to:[sss] after :
Line 5: has from:[t] to:[ss] at end
"""
patch914575_from3 = """line 0
1234567890123456789012345689012345
line 1
line 2
line 3
line 4 changed
line 5 changed
line 6 changed
line 7
line 8 subtracted
line 9
1234567890123456789012345689012345
short line
just fits in!!
just fits in two lines yup!!
the end"""
patch914575_to3 = """line 0
1234567890123456789012345689012345
line 1
line 2 added
line 3
line 4 chanGEd
line 5a chanGed
line 6a changEd
line 7
line 8
line 9
1234567890
another long line that needs to be wrapped
just fitS in!!
just fits in two lineS yup!!
the end"""
class TestSFpatches(unittest.TestCase):
def test_html_diff(self):
# Check SF patch 914575 for generating HTML differences
f1a = ((patch914575_from1 + '123\n'*10)*3)
t1a = (patch914575_to1 + '123\n'*10)*3
f1b = '456\n'*10 + f1a
t1b = '456\n'*10 + t1a
f1a = f1a.splitlines()
t1a = t1a.splitlines()
f1b = f1b.splitlines()
t1b = t1b.splitlines()
f2 = patch914575_from2.splitlines()
t2 = patch914575_to2.splitlines()
f3 = patch914575_from3
t3 = patch914575_to3
i = difflib.HtmlDiff()
j = difflib.HtmlDiff(tabsize=2)
k = difflib.HtmlDiff(wrapcolumn=14)
full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
tables = '\n'.join(
[
'<h2>Context (first diff within numlines=5(default))</h2>',
i.make_table(f1a,t1a,'from','to',context=True),
'<h2>Context (first diff after numlines=5(default))</h2>',
i.make_table(f1b,t1b,'from','to',context=True),
'<h2>Context (numlines=6)</h2>',
i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
'<h2>Context (numlines=0)</h2>',
i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
'<h2>Same Context</h2>',
i.make_table(f1a,f1a,'from','to',context=True),
'<h2>Same Full</h2>',
i.make_table(f1a,f1a,'from','to',context=False),
'<h2>Empty Context</h2>',
i.make_table([],[],'from','to',context=True),
'<h2>Empty Full</h2>',
i.make_table([],[],'from','to',context=False),
'<h2>tabsize=2</h2>',
j.make_table(f2,t2),
'<h2>tabsize=default</h2>',
i.make_table(f2,t2),
'<h2>Context (wrapcolumn=14,numlines=0)</h2>',
k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
'<h2>wrapcolumn=14,splitlines()</h2>',
k.make_table(f3.splitlines(),t3.splitlines()),
'<h2>wrapcolumn=14,splitlines(True)</h2>',
k.make_table(f3.splitlines(True),t3.splitlines(True)),
])
actual = full.replace('</body>','\n%s\n</body>' % tables)
# temporarily uncomment next two lines to baseline this test
#with open('test_difflib_expect.html','w') as fp:
# fp.write(actual)
with open(findfile('test_difflib_expect.html')) as fp:
self.assertEqual(actual, fp.read())
def test_recursion_limit(self):
# Check if the problem described in patch #1413711 exists.
limit = sys.getrecursionlimit()
old = [(i%2 and "K:%d" or "V:A:%d") % i for i in range(limit*2)]
new = [(i%2 and "K:%d" or "V:B:%d") % i for i in range(limit*2)]
difflib.SequenceMatcher(None, old, new).get_opcodes()
class TestOutputFormat(unittest.TestCase):
def test_tab_delimiter(self):
args = ['one', 'two', 'Original', 'Current',
'2005-01-26 23:30:50', '2010-04-02 10:20:52']
ud = difflib.unified_diff(*args, lineterm='')
self.assertEqual(list(ud)[0:2], [
"--- Original\t2005-01-26 23:30:50",
"+++ Current\t2010-04-02 10:20:52"])
cd = difflib.context_diff(*args, lineterm='')
self.assertEqual(list(cd)[0:2], [
"*** Original\t2005-01-26 23:30:50",
"--- Current\t2010-04-02 10:20:52"])
def test_no_trailing_tab_on_empty_filedate(self):
args = ['one', 'two', 'Original', 'Current']
ud = difflib.unified_diff(*args, lineterm='')
self.assertEqual(list(ud)[0:2], ["--- Original", "+++ Current"])
cd = difflib.context_diff(*args, lineterm='')
self.assertEqual(list(cd)[0:2], ["*** Original", "--- Current"])
def test_main():
difflib.HtmlDiff._default_prefix = 0
Doctests = doctest.DocTestSuite(difflib)
run_unittest(
TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
TestOutputFormat, Doctests)
if __name__ == '__main__':
test_main()
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