559 lines
22 KiB
Python
559 lines
22 KiB
Python
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)])
|
||
self.assertEqual(sm.bpopular, set())
|
||
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)])
|
||
self.assertEqual(sm.bpopular, set())
|
||
|
||
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)])
|
||
|
||
def test_bjunk(self):
|
||
sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
|
||
a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40)
|
||
self.assertEqual(sm.bjunk, set())
|
||
|
||
sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
|
||
a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
|
||
self.assertEqual(sm.bjunk, {' '})
|
||
|
||
sm = difflib.SequenceMatcher(isjunk=lambda x: x in [' ', 'b'],
|
||
a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
|
||
self.assertEqual(sm.bjunk, {' ', 'b'})
|
||
|
||
|
||
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)
|
||
self.assertEqual(sm.bpopular, {'b'})
|
||
|
||
# Now turn the heuristic off
|
||
sm = difflib.SequenceMatcher(None, seq1, seq2, autojunk=False)
|
||
self.assertAlmostEqual(sm.ratio(), 0.9975, places=3)
|
||
self.assertEqual(sm.bpopular, set())
|
||
|
||
|
||
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_matching_blocks_cache(self):
|
||
# Issue #21635
|
||
s = difflib.SequenceMatcher(None, "abxcd", "abcd")
|
||
first = s.get_matching_blocks()
|
||
second = s.get_matching_blocks()
|
||
self.assertEqual(second[0].size, 2)
|
||
self.assertEqual(second[1].size, 2)
|
||
self.assertEqual(second[2].size, 0)
|
||
|
||
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("? \t --\n", diff[1])
|
||
self.assertEqual("+ \t\tI am a bug", diff[2])
|
||
self.assertEqual("? +\n", diff[3])
|
||
|
||
def test_hint_indented_properly_with_tabs(self):
|
||
diff = list(difflib.Differ().compare(["\t \t \t^"], ["\t \t \t^\n"]))
|
||
self.assertEqual("- \t \t \t^", diff[0])
|
||
self.assertEqual("+ \t \t \t^\n", diff[1])
|
||
self.assertEqual("? \t \t \t +\n", diff[2])
|
||
|
||
def test_mdiff_catch_stop_iteration(self):
|
||
# Issue #33224
|
||
self.assertEqual(
|
||
list(difflib._mdiff(["2"], ["3"], 1)),
|
||
[((1, '\x00-2\x01'), (1, '\x00+3\x01'), True)],
|
||
)
|
||
|
||
|
||
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_nonascii_from1 = """
|
||
1. Beautiful is beTTer than ugly.
|
||
2. Explicit is better than ımplıcıt.
|
||
3. Simple is better than complex.
|
||
4. Complex is better than complicated.
|
||
"""
|
||
|
||
patch914575_nonascii_to1 = """
|
||
1. Beautiful is better than ügly.
|
||
3. Sımple is better than complex.
|
||
4. Complicated is better than cömplex.
|
||
5. Flat is better than nested.
|
||
"""
|
||
|
||
patch914575_from2 = """
|
||
\t\tLine 1: preceded by from:[tt] to:[ssss]
|
||
\t\tLine 2: preceded by from:[sstt] to:[sssst]
|
||
\t \tLine 3: preceded 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: preceded by from:[tt] to:[ssss]
|
||
\tLine 2: preceded by from:[sstt] to:[sssst]
|
||
Line 3: preceded 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()
|
||
|
||
def test_make_file_default_charset(self):
|
||
html_diff = difflib.HtmlDiff()
|
||
output = html_diff.make_file(patch914575_from1.splitlines(),
|
||
patch914575_to1.splitlines())
|
||
self.assertIn('content="text/html; charset=utf-8"', output)
|
||
|
||
def test_make_file_iso88591_charset(self):
|
||
html_diff = difflib.HtmlDiff()
|
||
output = html_diff.make_file(patch914575_from1.splitlines(),
|
||
patch914575_to1.splitlines(),
|
||
charset='iso-8859-1')
|
||
self.assertIn('content="text/html; charset=iso-8859-1"', output)
|
||
|
||
def test_make_file_usascii_charset_with_nonascii_input(self):
|
||
html_diff = difflib.HtmlDiff()
|
||
output = html_diff.make_file(patch914575_nonascii_from1.splitlines(),
|
||
patch914575_nonascii_to1.splitlines(),
|
||
charset='us-ascii')
|
||
self.assertIn('content="text/html; charset=us-ascii"', output)
|
||
self.assertIn('ımplıcıt', output)
|
||
|
||
|
||
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_range_format_unified(self):
|
||
# Per the diff spec at http://www.unix.org/single_unix_specification/
|
||
spec = '''\
|
||
Each <range> field shall be of the form:
|
||
%1d", <beginning line number> if the range contains exactly one line,
|
||
and:
|
||
"%1d,%1d", <beginning line number>, <number of lines> otherwise.
|
||
If a range is empty, its beginning line number shall be the number of
|
||
the line just before the range, or 0 if the empty range starts the file.
|
||
'''
|
||
fmt = difflib._format_range_unified
|
||
self.assertEqual(fmt(3,3), '3,0')
|
||
self.assertEqual(fmt(3,4), '4')
|
||
self.assertEqual(fmt(3,5), '4,2')
|
||
self.assertEqual(fmt(3,6), '4,3')
|
||
self.assertEqual(fmt(0,0), '0,0')
|
||
|
||
def test_range_format_context(self):
|
||
# Per the diff spec at http://www.unix.org/single_unix_specification/
|
||
spec = '''\
|
||
The range of lines in file1 shall be written in the following format
|
||
if the range contains two or more lines:
|
||
"*** %d,%d ****\n", <beginning line number>, <ending line number>
|
||
and the following format otherwise:
|
||
"*** %d ****\n", <ending line number>
|
||
The ending line number of an empty range shall be the number of the preceding line,
|
||
or 0 if the range is at the start of the file.
|
||
|
||
Next, the range of lines in file2 shall be written in the following format
|
||
if the range contains two or more lines:
|
||
"--- %d,%d ----\n", <beginning line number>, <ending line number>
|
||
and the following format otherwise:
|
||
"--- %d ----\n", <ending line number>
|
||
'''
|
||
fmt = difflib._format_range_context
|
||
self.assertEqual(fmt(3,3), '3')
|
||
self.assertEqual(fmt(3,4), '4')
|
||
self.assertEqual(fmt(3,5), '4,5')
|
||
self.assertEqual(fmt(3,6), '4,6')
|
||
self.assertEqual(fmt(0,0), '0')
|
||
|
||
|
||
class TestBytes(unittest.TestCase):
|
||
# don't really care about the content of the output, just the fact
|
||
# that it's bytes and we don't crash
|
||
def check(self, diff):
|
||
diff = list(diff) # trigger exceptions first
|
||
for line in diff:
|
||
self.assertIsInstance(
|
||
line, bytes,
|
||
"all lines of diff should be bytes, but got: %r" % line)
|
||
|
||
def test_byte_content(self):
|
||
# if we receive byte strings, we return byte strings
|
||
a = [b'hello', b'andr\xe9'] # iso-8859-1 bytes
|
||
b = [b'hello', b'andr\xc3\xa9'] # utf-8 bytes
|
||
|
||
unified = difflib.unified_diff
|
||
context = difflib.context_diff
|
||
|
||
check = self.check
|
||
check(difflib.diff_bytes(unified, a, a))
|
||
check(difflib.diff_bytes(unified, a, b))
|
||
|
||
# now with filenames (content and filenames are all bytes!)
|
||
check(difflib.diff_bytes(unified, a, a, b'a', b'a'))
|
||
check(difflib.diff_bytes(unified, a, b, b'a', b'b'))
|
||
|
||
# and with filenames and dates
|
||
check(difflib.diff_bytes(unified, a, a, b'a', b'a', b'2005', b'2013'))
|
||
check(difflib.diff_bytes(unified, a, b, b'a', b'b', b'2005', b'2013'))
|
||
|
||
# same all over again, with context diff
|
||
check(difflib.diff_bytes(context, a, a))
|
||
check(difflib.diff_bytes(context, a, b))
|
||
check(difflib.diff_bytes(context, a, a, b'a', b'a'))
|
||
check(difflib.diff_bytes(context, a, b, b'a', b'b'))
|
||
check(difflib.diff_bytes(context, a, a, b'a', b'a', b'2005', b'2013'))
|
||
check(difflib.diff_bytes(context, a, b, b'a', b'b', b'2005', b'2013'))
|
||
|
||
def test_byte_filenames(self):
|
||
# somebody renamed a file from ISO-8859-2 to UTF-8
|
||
fna = b'\xb3odz.txt' # "łodz.txt"
|
||
fnb = b'\xc5\x82odz.txt'
|
||
|
||
# they transcoded the content at the same time
|
||
a = [b'\xa3odz is a city in Poland.']
|
||
b = [b'\xc5\x81odz is a city in Poland.']
|
||
|
||
check = self.check
|
||
unified = difflib.unified_diff
|
||
context = difflib.context_diff
|
||
check(difflib.diff_bytes(unified, a, b, fna, fnb))
|
||
check(difflib.diff_bytes(context, a, b, fna, fnb))
|
||
|
||
def assertDiff(expect, actual):
|
||
# do not compare expect and equal as lists, because unittest
|
||
# uses difflib to report difference between lists
|
||
actual = list(actual)
|
||
self.assertEqual(len(expect), len(actual))
|
||
for e, a in zip(expect, actual):
|
||
self.assertEqual(e, a)
|
||
|
||
expect = [
|
||
b'--- \xb3odz.txt',
|
||
b'+++ \xc5\x82odz.txt',
|
||
b'@@ -1 +1 @@',
|
||
b'-\xa3odz is a city in Poland.',
|
||
b'+\xc5\x81odz is a city in Poland.',
|
||
]
|
||
actual = difflib.diff_bytes(unified, a, b, fna, fnb, lineterm=b'')
|
||
assertDiff(expect, actual)
|
||
|
||
# with dates (plain ASCII)
|
||
datea = b'2005-03-18'
|
||
dateb = b'2005-03-19'
|
||
check(difflib.diff_bytes(unified, a, b, fna, fnb, datea, dateb))
|
||
check(difflib.diff_bytes(context, a, b, fna, fnb, datea, dateb))
|
||
|
||
expect = [
|
||
# note the mixed encodings here: this is deeply wrong by every
|
||
# tenet of Unicode, but it doesn't crash, it's parseable by
|
||
# patch, and it's how UNIX(tm) diff behaves
|
||
b'--- \xb3odz.txt\t2005-03-18',
|
||
b'+++ \xc5\x82odz.txt\t2005-03-19',
|
||
b'@@ -1 +1 @@',
|
||
b'-\xa3odz is a city in Poland.',
|
||
b'+\xc5\x81odz is a city in Poland.',
|
||
]
|
||
actual = difflib.diff_bytes(unified, a, b, fna, fnb, datea, dateb,
|
||
lineterm=b'')
|
||
assertDiff(expect, actual)
|
||
|
||
def test_mixed_types_content(self):
|
||
# type of input content must be consistent: all str or all bytes
|
||
a = [b'hello']
|
||
b = ['hello']
|
||
|
||
unified = difflib.unified_diff
|
||
context = difflib.context_diff
|
||
|
||
expect = "lines to compare must be str, not bytes (b'hello')"
|
||
self._assert_type_error(expect, unified, a, b)
|
||
self._assert_type_error(expect, unified, b, a)
|
||
self._assert_type_error(expect, context, a, b)
|
||
self._assert_type_error(expect, context, b, a)
|
||
|
||
expect = "all arguments must be bytes, not str ('hello')"
|
||
self._assert_type_error(expect, difflib.diff_bytes, unified, a, b)
|
||
self._assert_type_error(expect, difflib.diff_bytes, unified, b, a)
|
||
self._assert_type_error(expect, difflib.diff_bytes, context, a, b)
|
||
self._assert_type_error(expect, difflib.diff_bytes, context, b, a)
|
||
|
||
def test_mixed_types_filenames(self):
|
||
# cannot pass filenames as bytes if content is str (this may not be
|
||
# the right behaviour, but at least the test demonstrates how
|
||
# things work)
|
||
a = ['hello\n']
|
||
b = ['ohell\n']
|
||
fna = b'ol\xe9.txt' # filename transcoded from ISO-8859-1
|
||
fnb = b'ol\xc3a9.txt' # to UTF-8
|
||
self._assert_type_error(
|
||
"all arguments must be str, not: b'ol\\xe9.txt'",
|
||
difflib.unified_diff, a, b, fna, fnb)
|
||
|
||
def test_mixed_types_dates(self):
|
||
# type of dates must be consistent with type of contents
|
||
a = [b'foo\n']
|
||
b = [b'bar\n']
|
||
datea = '1 fév'
|
||
dateb = '3 fév'
|
||
self._assert_type_error(
|
||
"all arguments must be bytes, not str ('1 fév')",
|
||
difflib.diff_bytes, difflib.unified_diff,
|
||
a, b, b'a', b'b', datea, dateb)
|
||
|
||
# if input is str, non-ASCII dates are fine
|
||
a = ['foo\n']
|
||
b = ['bar\n']
|
||
list(difflib.unified_diff(a, b, 'a', 'b', datea, dateb))
|
||
|
||
def _assert_type_error(self, msg, generator, *args):
|
||
with self.assertRaises(TypeError) as ctx:
|
||
list(generator(*args))
|
||
self.assertEqual(msg, str(ctx.exception))
|
||
|
||
class TestJunkAPIs(unittest.TestCase):
|
||
def test_is_line_junk_true(self):
|
||
for line in ['#', ' ', ' #', '# ', ' # ', '']:
|
||
self.assertTrue(difflib.IS_LINE_JUNK(line), repr(line))
|
||
|
||
def test_is_line_junk_false(self):
|
||
for line in ['##', ' ##', '## ', 'abc ', 'abc #', 'Mr. Moose is up!']:
|
||
self.assertFalse(difflib.IS_LINE_JUNK(line), repr(line))
|
||
|
||
def test_is_line_junk_REDOS(self):
|
||
evil_input = ('\t' * 1000000) + '##'
|
||
self.assertFalse(difflib.IS_LINE_JUNK(evil_input))
|
||
|
||
def test_is_character_junk_true(self):
|
||
for char in [' ', '\t']:
|
||
self.assertTrue(difflib.IS_CHARACTER_JUNK(char), repr(char))
|
||
|
||
def test_is_character_junk_false(self):
|
||
for char in ['a', '#', '\n', '\f', '\r', '\v']:
|
||
self.assertFalse(difflib.IS_CHARACTER_JUNK(char), repr(char))
|
||
|
||
class TestFindLongest(unittest.TestCase):
|
||
def longer_match_exists(self, a, b, n):
|
||
return any(b_part in a for b_part in
|
||
[b[i:i + n + 1] for i in range(0, len(b) - n - 1)])
|
||
|
||
def test_default_args(self):
|
||
a = 'foo bar'
|
||
b = 'foo baz bar'
|
||
sm = difflib.SequenceMatcher(a=a, b=b)
|
||
match = sm.find_longest_match()
|
||
self.assertEqual(match.a, 0)
|
||
self.assertEqual(match.b, 0)
|
||
self.assertEqual(match.size, 6)
|
||
self.assertEqual(a[match.a: match.a + match.size],
|
||
b[match.b: match.b + match.size])
|
||
self.assertFalse(self.longer_match_exists(a, b, match.size))
|
||
|
||
match = sm.find_longest_match(alo=2, blo=4)
|
||
self.assertEqual(match.a, 3)
|
||
self.assertEqual(match.b, 7)
|
||
self.assertEqual(match.size, 4)
|
||
self.assertEqual(a[match.a: match.a + match.size],
|
||
b[match.b: match.b + match.size])
|
||
self.assertFalse(self.longer_match_exists(a[2:], b[4:], match.size))
|
||
|
||
match = sm.find_longest_match(bhi=5, blo=1)
|
||
self.assertEqual(match.a, 1)
|
||
self.assertEqual(match.b, 1)
|
||
self.assertEqual(match.size, 4)
|
||
self.assertEqual(a[match.a: match.a + match.size],
|
||
b[match.b: match.b + match.size])
|
||
self.assertFalse(self.longer_match_exists(a, b[1:5], match.size))
|
||
|
||
def test_longest_match_with_popular_chars(self):
|
||
a = 'dabcd'
|
||
b = 'd'*100 + 'abc' + 'd'*100 # length over 200 so popular used
|
||
sm = difflib.SequenceMatcher(a=a, b=b)
|
||
match = sm.find_longest_match(0, len(a), 0, len(b))
|
||
self.assertEqual(match.a, 0)
|
||
self.assertEqual(match.b, 99)
|
||
self.assertEqual(match.size, 5)
|
||
self.assertEqual(a[match.a: match.a + match.size],
|
||
b[match.b: match.b + match.size])
|
||
self.assertFalse(self.longer_match_exists(a, b, match.size))
|
||
|
||
|
||
def test_main():
|
||
difflib.HtmlDiff._default_prefix = 0
|
||
Doctests = doctest.DocTestSuite(difflib)
|
||
run_unittest(
|
||
TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
|
||
TestOutputFormat, TestBytes, TestJunkAPIs, TestFindLongest, Doctests)
|
||
|
||
if __name__ == '__main__':
|
||
test_main()
|