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Source.Python/addons/source-python/Python3/fnmatch.py at Data-Update · srpg/Source.Python · GitHub
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fnmatch.py
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Source.Python
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addons
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source-python
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Python3
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fnmatch.py
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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
=
32768
,
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
):
"""Construct a list from those elements of the iterable 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.
"""
STAR
=
object
()
parts
=
_translate
(
pat
,
STAR
,
'.'
)
return
_join_translated_parts
(
parts
,
STAR
)
def
_translate
(
pat
,
STAR
,
QUESTION_MARK
):
res
=
[]
add
=
res
.
append
i
,
n
=
0
,
len
(
pat
)
while
i
<
n
:
c
=
pat
[
i
]
i
=
i
+
1
if
c
==
'*'
:
# compress consecutive `*` into one
if
(
not
res
)
or
res
[
-
1
]
is
not
STAR
:
add
(
STAR
)
elif
c
==
'?'
:
add
(
QUESTION_MARK
)
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
:
add
(
'
\\
['
)
else
:
stuff
=
pat
[
i
:
j
]
if
'-'
not
in
stuff
:
stuff
=
stuff
.
replace
(
'
\\
'
,
r'\\'
)
else
:
chunks
=
[]
k
=
i
+
2
if
pat
[
i
]
==
'!'
else
i
+
1
while
True
:
k
=
pat
.
find
(
'-'
,
k
,
j
)
if
k
<
0
:
break
chunks
.
append
(
pat
[
i
:
k
])
i
=
k
+
1
k
=
k
+
3
chunk
=
pat
[
i
:
j
]
if
chunk
:
chunks
.
append
(
chunk
)
else
:
chunks
[
-
1
]
+=
'-'
# Remove empty ranges -- invalid in RE.
for
k
in
range
(
len
(
chunks
)
-
1
,
0
,
-
1
):
if
chunks
[
k
-
1
][
-
1
]
>
chunks
[
k
][
0
]:
chunks
[
k
-
1
]
=
chunks
[
k
-
1
][:
-
1
]
+
chunks
[
k
][
1
:]
del
chunks
[
k
]
# Escape backslashes and hyphens for set difference (--).
# Hyphens that create ranges shouldn't be escaped.
stuff
=
'-'
.
join
(
s
.
replace
(
'
\\
'
,
r'\\'
).
replace
(
'-'
,
r'\-'
)
for
s
in
chunks
)
# Escape set operations (&&, ~~ and ||).
stuff
=
re
.
sub
(
r'([&~|])'
,
r'\\\1'
,
stuff
)
i
=
j
+
1
if
not
stuff
:
# Empty range: never match.
add
(
'(?!)'
)
elif
stuff
==
'!'
:
# Negated empty range: match any character.
add
(
'.'
)
else
:
if
stuff
[
0
]
==
'!'
:
stuff
=
'^'
+
stuff
[
1
:]
elif
stuff
[
0
]
in
(
'^'
,
'['
):
stuff
=
'
\\
'
+
stuff
add
(
f'[
{
stuff
}
]'
)
else
:
add
(
re
.
escape
(
c
))
assert
i
==
n
return
res
def
_join_translated_parts
(
inp
,
STAR
):
# Deal with STARs.
res
=
[]
add
=
res
.
append
i
,
n
=
0
,
len
(
inp
)
# Fixed pieces at the start?
while
i
<
n
and
inp
[
i
]
is
not
STAR
:
add
(
inp
[
i
])
i
+=
1
# Now deal with STAR fixed STAR fixed ...
# For an interior `STAR fixed` pairing, we want to do a minimal
# .*? match followed by `fixed`, with no possibility of backtracking.
# Atomic groups ("(?>...)") allow us to spell that directly.
# Note: people rely on the undocumented ability to join multiple
# translate() results together via "|" to build large regexps matching
# "one of many" shell patterns.
while
i
<
n
:
assert
inp
[
i
]
is
STAR
i
+=
1
if
i
==
n
:
add
(
".*"
)
break
assert
inp
[
i
]
is
not
STAR
fixed
=
[]
while
i
<
n
and
inp
[
i
]
is
not
STAR
:
fixed
.
append
(
inp
[
i
])
i
+=
1
fixed
=
""
.
join
(
fixed
)
if
i
==
n
:
add
(
".*"
)
add
(
fixed
)
else
:
add
(
f"(?>.*?
{
fixed
}
)"
)
assert
i
==
n
res
=
""
.
join
(
res
)
return
fr'(?s:
{
res
}
)\Z'
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