1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
"""Match wildcard filenames.
"""
# Adapted from https://hg.python.org/cpython/file/2.7/Lib/fnmatch.py
from __future__ import print_function, unicode_literals
import typing
import re
from functools import partial
from .lrucache import LRUCache
if typing.TYPE_CHECKING:
from typing import Callable, Iterable, Pattern, Text, Tuple
_PATTERN_CACHE = LRUCache(1000) # type: LRUCache[Tuple[Text, bool], Pattern]
def match(pattern, name):
# type: (Text, Text) -> bool
"""Test whether a name matches a wildcard pattern.
Arguments:
pattern (str): A wildcard pattern, e.g. ``"*.py"``.
name (str): A filename.
Returns:
bool: `True` if the filename matches the pattern.
"""
try:
re_pat = _PATTERN_CACHE[(pattern, True)]
except KeyError:
res = "(?ms)" + _translate(pattern) + r"\Z"
_PATTERN_CACHE[(pattern, True)] = re_pat = re.compile(res)
return re_pat.match(name) is not None
def imatch(pattern, name):
# type: (Text, Text) -> bool
"""Test whether a name matches a wildcard pattern (case insensitive).
Arguments:
pattern (str): A wildcard pattern, e.g. ``"*.py"``.
name (bool): A filename.
Returns:
bool: `True` if the filename matches the pattern.
"""
try:
re_pat = _PATTERN_CACHE[(pattern, False)]
except KeyError:
res = "(?ms)" + _translate(pattern, case_sensitive=False) + r"\Z"
_PATTERN_CACHE[(pattern, False)] = re_pat = re.compile(res, re.IGNORECASE)
return re_pat.match(name) is not None
def match_any(patterns, name):
# type: (Iterable[Text], Text) -> bool
"""Test if a name matches any of a list of patterns.
Will return `True` if ``patterns`` is an empty list.
Arguments:
patterns (list): A list of wildcard pattern, e.g ``["*.py",
"*.pyc"]``
name (str): A filename.
Returns:
bool: `True` if the name matches at least one of the patterns.
"""
if not patterns:
return True
return any(match(pattern, name) for pattern in patterns)
def imatch_any(patterns, name):
# type: (Iterable[Text], Text) -> bool
"""Test if a name matches any of a list of patterns (case insensitive).
Will return `True` if ``patterns`` is an empty list.
Arguments:
patterns (list): A list of wildcard pattern, e.g ``["*.py",
"*.pyc"]``
name (str): A filename.
Returns:
bool: `True` if the name matches at least one of the patterns.
"""
if not patterns:
return True
return any(imatch(pattern, name) for pattern in patterns)
def get_matcher(patterns, case_sensitive):
# type: (Iterable[Text], bool) -> Callable[[Text], bool]
"""Get a callable that matches names against the given patterns.
Arguments:
patterns (list): A list of wildcard pattern. e.g. ``["*.py",
"*.pyc"]``
case_sensitive (bool): If ``True``, then the callable will be case
sensitive, otherwise it will be case insensitive.
Returns:
callable: a matcher that will return `True` if the name given as
an argument matches any of the given patterns.
Example:
>>> from fs import wildcard
>>> is_python = wildcard.get_matcher(['*.py'], True)
>>> is_python('__init__.py')
True
>>> is_python('foo.txt')
False
"""
if not patterns:
return lambda name: True
if case_sensitive:
return partial(match_any, patterns)
else:
return partial(imatch_any, patterns)
def _translate(pattern, case_sensitive=True):
# type: (Text, bool) -> Text
"""Translate a wildcard pattern to a regular expression.
There is no way to quote meta-characters.
Arguments:
pattern (str): A wildcard pattern.
case_sensitive (bool): Set to `False` to use a case
insensitive regex (default `True`).
Returns:
str: A regex equivalent to the given pattern.
"""
if not case_sensitive:
pattern = pattern.lower()
i, n = 0, len(pattern)
res = ""
while i < n:
c = pattern[i]
i = i + 1
if c == "*":
res = res + "[^/]*"
elif c == "?":
res = res + "."
elif c == "[":
j = i
if j < n and pattern[j] == "!":
j = j + 1
if j < n and pattern[j] == "]":
j = j + 1
while j < n and pattern[j] != "]":
j = j + 1
if j >= n:
res = res + "\\["
else:
stuff = pattern[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 res
|
