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Python3
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fnmatch.py
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Source.Python
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addons
/
source-python
/
Python3
/
fnmatch.py
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109 lines (93 loc) · 3.09 KB
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"""Filename matching with shell patterns.
fnmatch(FILENAME, PATTERN) matches according to the local convention.
fnmatchcase(FILENAME, PATTERN) always takes case in account.
The functions operate by translating the pattern into a regular
expression. They cache the compiled regular expressions for speed.
The function translate(PATTERN) returns a regular expression
corresponding to PATTERN. (It does not compile it.)
"""
import
os
import
posixpath
import
re
import
functools
__all__
=
[
"filter"
,
"fnmatch"
,
"fnmatchcase"
,
"translate"
]
def
fnmatch
(
name
,
pat
):
"""Test whether FILENAME matches PATTERN.
Patterns are Unix shell style:
* matches everything
? matches any single character
[seq] matches any character in seq
[!seq] matches any char not in seq
An initial period in FILENAME is not special.
Both FILENAME and PATTERN are first case-normalized
if the operating system requires it.
If you don't want this, use fnmatchcase(FILENAME, PATTERN).
"""
name
=
os
.
path
.
normcase
(
name
)
pat
=
os
.
path
.
normcase
(
pat
)
return
fnmatchcase
(
name
,
pat
)
@
functools
.
lru_cache
(
maxsize
=
256
,
typed
=
True
)
def
_compile_pattern
(
pat
):
if
isinstance
(
pat
,
bytes
):
pat_str
=
str
(
pat
,
'ISO-8859-1'
)
res_str
=
translate
(
pat_str
)
res
=
bytes
(
res_str
,
'ISO-8859-1'
)
else
:
res
=
translate
(
pat
)
return
re
.
compile
(
res
).
match
def
filter
(
names
,
pat
):
"""Return the subset of the list NAMES that match PAT."""
result
=
[]
pat
=
os
.
path
.
normcase
(
pat
)
match
=
_compile_pattern
(
pat
)
if
os
.
path
is
posixpath
:
# normcase on posix is NOP. Optimize it away from the loop.
for
name
in
names
:
if
match
(
name
):
result
.
append
(
name
)
else
:
for
name
in
names
:
if
match
(
os
.
path
.
normcase
(
name
)):
result
.
append
(
name
)
return
result
def
fnmatchcase
(
name
,
pat
):
"""Test whether FILENAME matches PATTERN, including case.
This is a version of fnmatch() which doesn't case-normalize
its arguments.
"""
match
=
_compile_pattern
(
pat
)
return
match
(
name
)
is
not
None
def
translate
(
pat
):
"""Translate a shell PATTERN to a regular expression.
There is no way to quote meta-characters.
"""
i
,
n
=
0
,
len
(
pat
)
res
=
''
while
i
<
n
:
c
=
pat
[
i
]
i
=
i
+
1
if
c
==
'*'
:
res
=
res
+
'.*'
elif
c
==
'?'
:
res
=
res
+
'.'
elif
c
==
'['
:
j
=
i
if
j
<
n
and
pat
[
j
]
==
'!'
:
j
=
j
+
1
if
j
<
n
and
pat
[
j
]
==
']'
:
j
=
j
+
1
while
j
<
n
and
pat
[
j
]
!=
']'
:
j
=
j
+
1
if
j
>=
n
:
res
=
res
+
'
\\
['
else
:
stuff
=
pat
[
i
:
j
].
replace
(
'
\\
'
,
'
\\
\\
'
)
i
=
j
+
1
if
stuff
[
0
]
==
'!'
:
stuff
=
'^'
+
stuff
[
1
:]
elif
stuff
[
0
]
==
'^'
:
stuff
=
'
\\
'
+
stuff
res
=
'%s[%s]'
%
(
res
,
stuff
)
else
:
res
=
res
+
re
.
escape
(
c
)
return
r'(?s:%s)\Z'
%
res
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