iframe-proxy | Sunbelt Computer Software

History

209 lines (178 loc) · 6.63 KB

Raw

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

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

"""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 functools

import itertools

import os

import posixpath

import re

__all__ = ["filter", "filterfalse", "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 filterfalse(names, pat):

"""Construct a list from those elements of the iterable NAMES that do not match PAT."""

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.

return list(itertools.filterfalse(match, names))

result = []

for name in names:

if match(os.path.normcase(name)) is None:

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.

"""

parts, star_indices = _translate(pat, '*', '.')

return _join_translated_parts(parts, star_indices)

_re_setops_sub = re.compile(r'([&~|])').sub

_re_escape = functools.lru_cache(maxsize=512)(re.escape)

def _translate(pat, star, question_mark):

res = []

add = res.append

star_indices = []

i, n = 0, len(pat)

while i < n:

c = pat[i]

i = i+1

if c == '*':

# store the position of the wildcard

star_indices.append(len(res))

add(star)

# compress consecutive `*` into one

while i < n and pat[i] == '*':

i += 1

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)

i = j+1

if not stuff:

# Empty range: never match.

add('(?!)')

elif stuff == '!':

# Negated empty range: match any character.

add('.')

else:

# Escape set operations (&&, ~~ and ||).

stuff = _re_setops_sub(r'\\\1', stuff)

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, star_indices

def _join_translated_parts(parts, star_indices):

if not star_indices:

return fr'(?s:{"".join(parts)})\z'

iter_star_indices = iter(star_indices)

j = next(iter_star_indices)

buffer = parts[:j] # fixed pieces at the start

append, extend = buffer.append, buffer.extend

i = j + 1

for j in iter_star_indices:

# 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.

append('(?>.*?')

extend(parts[i:j])

append(')')

i = j + 1

append('.*')

extend(parts[i:])

res = ''.join(buffer)

return fr'(?s:{res})\z'

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Uh oh!

Sunbelt Computer Software

PL/B Language Development and Support

Uh oh!

FilesExpand file tree

fnmatch.py

Latest commit

History

fnmatch.py

File metadata and controls