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pathabbr.py
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pathabbr.py
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u"""Manipulating file name paths."""
import os.path
import unittest
def pathsplit(x):
r = []
cur = x
while True:
head, tail = os.path.split(cur)
if head == cur and tail == u'':
r.append(cur)
break
r.append(tail)
if head == u'':
break
cur = head
return tuple(reversed(r))
def pathnormalise(x):
return os.path.join(*pathsplit(x))
def pathtail(x, n):
if n == 0:
return u''
l = pathsplit(x)
if len(l) > 0 and l[-1] == u'':
n += 1
if len(l) > n:
l = l[-n:]
return os.path.join(*l)
def _try_pathabbr(paths, n):
reverse = {}
result = {}
for x in paths:
normalised = pathnormalise(x)
tail = pathtail(x, n)
if tail in reverse and reverse[tail] != normalised:
return None
result[x] = tail
reverse[tail] = normalised
return result
def pathabbr(paths):
n = 1
while True:
result = _try_pathabbr(paths, n)
if result is not None:
return result
n += 1
#### Unit tests
class TestPathSplit(unittest.TestCase):
def test_rel(self):
self.assertEqual(pathsplit(u''), (u'',))
self.assertEqual(pathsplit(u'a1'), (u'a1',))
self.assertEqual(pathsplit(u'a1/a2'), (u'a1', u'a2'))
self.assertEqual(pathsplit(u'a1/a2/a3'), (u'a1', u'a2', u'a3'))
def test_abs(self):
self.assertEqual(pathsplit(u'/'), (u'/',))
self.assertEqual(pathsplit(u'/a1'), (u'/', u'a1'))
self.assertEqual(pathsplit(u'/a1/a2'), (u'/', u'a1', u'a2'))
self.assertEqual(pathsplit(u'/a1/a2/a3'), (u'/', u'a1', u'a2', u'a3'))
def test_trail(self):
self.assertEqual(pathsplit(u'/'), (u'/',))
self.assertEqual(pathsplit(u'/a1/'), (u'/', u'a1', u''))
self.assertEqual(pathsplit(u'/a1/a2/'), (u'/', u'a1', u'a2', u''))
self.assertEqual(pathsplit(u'/a1/a2/a3/'), (u'/', u'a1', u'a2', u'a3', u''))
def test_strange(self):
self.assertEqual(pathsplit(u'a1////a2////a3'), (u'a1', u'a2', u'a3'))
self.assertEqual(pathsplit(u'////a1////a2////a3'), (u'////', u'a1', u'a2', u'a3'))
self.assertEqual(pathsplit(u'a1////a2////a3////'), (u'a1', u'a2', u'a3', u''))
self.assertEqual(pathsplit(u'////a1////a2////a3////'), (u'////', u'a1', u'a2', u'a3', u''))
class TestPathNormalise(unittest.TestCase):
def test_normal(self):
for a in [
u'', u'a1', u'a1/a2', u'a1/a2/a3',
u'/', u'/a1', u'/a1/a2', u'/a1/a2/a3',
u'/', u'a1/', u'a1/a2/', u'a1/a2/a3/',
u'/', u'/a1/', u'/a1/a2/', u'/a1/a2/a3/',
]:
self.assertEqual(pathnormalise(a), a)
def test_strange(self):
self.assertEqual(pathnormalise(u'a1////a2////a3'), u'a1/a2/a3')
self.assertEqual(pathnormalise(u'////a1////a2////a3'), u'////a1/a2/a3')
self.assertEqual(pathnormalise(u'a1////a2////a3////'), u'a1/a2/a3/')
self.assertEqual(pathnormalise(u'////a1////a2////a3////'), u'////a1/a2/a3/')
class TestPathTail(unittest.TestCase):
def test_one(self):
self.assertEqual(pathtail(u'a1', 0), u'')
self.assertEqual(pathtail(u'a1', 1), u'a1')
self.assertEqual(pathtail(u'a1', 2), u'a1')
self.assertEqual(pathtail(u'a1', 3), u'a1')
def test_rel(self):
self.assertEqual(pathtail(u'a1/a2/a3', 0), u'')
self.assertEqual(pathtail(u'a1/a2/a3', 1), u'a3')
self.assertEqual(pathtail(u'a1/a2/a3', 2), u'a2/a3')
self.assertEqual(pathtail(u'a1/a2/a3', 3), u'a1/a2/a3')
self.assertEqual(pathtail(u'a1/a2/a3', 4), u'a1/a2/a3')
self.assertEqual(pathtail(u'a1/a2/a3', 5), u'a1/a2/a3')
def test_root(self):
self.assertEqual(pathtail(u'/a1/a2/a3', 0), u'')
self.assertEqual(pathtail(u'/a1/a2/a3', 1), u'a3')
self.assertEqual(pathtail(u'/a1/a2/a3', 2), u'a2/a3')
self.assertEqual(pathtail(u'/a1/a2/a3', 3), u'a1/a2/a3')
self.assertEqual(pathtail(u'/a1/a2/a3', 4), u'/a1/a2/a3')
self.assertEqual(pathtail(u'/a1/a2/a3', 5), u'/a1/a2/a3')
def test_trail(self):
self.assertEqual(pathtail(u'a3/', 0), u'')
self.assertEqual(pathtail(u'a3/', 1), u'a3/')
self.assertEqual(pathtail(u'a3/', 2), u'a3/')
self.assertEqual(pathtail(u'/a1/a2/a3/', 0), u'')
self.assertEqual(pathtail(u'/a1/a2/a3/', 1), u'a3/')
self.assertEqual(pathtail(u'/a1/a2/a3/', 2), u'a2/a3/')
self.assertEqual(pathtail(u'/a1/a2/a3/', 3), u'a1/a2/a3/')
self.assertEqual(pathtail(u'/a1/a2/a3/', 4), u'/a1/a2/a3/')
self.assertEqual(pathtail(u'/a1/a2/a3/', 5), u'/a1/a2/a3/')
def test_strange(self):
self.assertEqual(pathtail(u'////a1////a2////a3////', 0), u'')
self.assertEqual(pathtail(u'////a1////a2////a3////', 1), u'a3/')
self.assertEqual(pathtail(u'////a1////a2////a3////', 2), u'a2/a3/')
self.assertEqual(pathtail(u'////a1////a2////a3////', 3), u'a1/a2/a3/')
self.assertEqual(pathtail(u'////a1////a2////a3////', 4), u'////a1/a2/a3/')
self.assertEqual(pathtail(u'////a1////a2////a3////', 5), u'////a1/a2/a3/')
class TestTryPathAbbr(unittest.TestCase):
def test_basic(self):
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3'], 1), {
u'a1/a2/a3': u'a3',
u'b1/b2/b3': u'b3',
})
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3'], 2), {
u'a1/a2/a3': u'a2/a3',
u'b1/b2/b3': u'b2/b3',
})
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3'], 3), {
u'a1/a2/a3': u'a1/a2/a3',
u'b1/b2/b3': u'b1/b2/b3',
})
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3'], 4), {
u'a1/a2/a3': u'a1/a2/a3',
u'b1/b2/b3': u'b1/b2/b3',
})
def test_conflict(self):
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3'], 0), None)
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3'], 1), {
u'a1/a2/a3': u'a3',
u'b1/b2/b3': u'b3',
})
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/a3'], 1), None)
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/a3'], 2), {
u'a1/a2/a3': u'a2/a3',
u'b1/b2/a3': u'b2/a3',
})
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/a2/a3'], 2), None)
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/a2/a3'], 3), {
u'a1/a2/a3': u'a1/a2/a3',
u'b1/a2/a3': u'b1/a2/a3',
})
def test_multi(self):
# Multiple occurrences of the same path are fine
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3', u'b1/b2/b3'], 1), {
u'a1/a2/a3': u'a3',
u'b1/b2/b3': u'b3',
})
# Not a conflict: refers to the same path, can have the same abbreviation
self.assertEqual(_try_pathabbr([u'a1/a2/a3', u'b1/b2/b3', u'b1/b2/b3', u'b1////b2////b3'], 1), {
u'a1/a2/a3': u'a3',
u'b1/b2/b3': u'b3',
u'b1////b2////b3': u'b3',
})
class TestPathAbbr(unittest.TestCase):
def test_basic(self):
self.assertEqual(pathabbr([u'a', u'b']), {
u'a': u'a',
u'b': u'b',
})
self.assertEqual(pathabbr([u'a1/a2', u'b1/b2']), {
u'a1/a2': u'a2',
u'b1/b2': u'b2',
})
self.assertEqual(pathabbr([u'a1/a2', u'b1/a2']), {
u'a1/a2': u'a1/a2',
u'b1/a2': u'b1/a2',
})
self.assertEqual(pathabbr([u'a1/a2/a3', u'b1/b2/a3']), {
u'a1/a2/a3': u'a2/a3',
u'b1/b2/a3': u'b2/a3',
})
self.assertEqual(pathabbr([u'a1/a2/a3', u'b1/a2/a3']), {
u'a1/a2/a3': u'a1/a2/a3',
u'b1/a2/a3': u'b1/a2/a3',
})
def test_lengths(self):
self.assertEqual(pathabbr([u'a1/a2/a3', u'b1/b2/a3', u'c1']), {
u'a1/a2/a3': u'a2/a3',
u'b1/b2/a3': u'b2/a3',
u'c1': u'c1',
})
def test_multi(self):
# Multiple occurrences of the same path are fine
self.assertEqual(pathabbr([u'a', u'b', u'b']), {
u'a': u'a',
u'b': u'b',
})
# Not a conflict: refers to the same path, can have the same abbreviation
self.assertEqual(pathabbr([u'a1/a2', u'b1/b2', u'b1////b2']), {
u'a1/a2': u'a2',
u'b1/b2': u'b2',
u'b1////b2': u'b2',
})
if __name__ == u'__main__':
unittest.main()