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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.)
Based on code from fnmatch.py file distributed with Python 2.6.
Licensed under PSF License (see LICENSE.PSF file).
Changes to original fnmatch module:
- translate function supports ``*`` and ``**`` similarly to fnmatch C library
"""
import os
import re
__all__ = ["fnmatch", "fnmatchcase", "translate"]
_cache = {}
LEFT_BRACE = re.compile(
r"""
(?<! \\ ) # Not preceded by "\"
\{ # "{"
""", re.VERBOSE
)
RIGHT_BRACE = re.compile(
r"""
(?<! \\ ) # Not preceded by "\"
\} # "}"
""", re.VERBOSE
)
NUMERIC_RANGE = re.compile(
r"""
( # Capture a number
[+-] ? # Zero or one "+" or "-" characters
\d + # One or more digits
)
\.\. # ".."
( # Capture a number
[+-] ? # Zero or one "+" or "-" characters
\d + # One or more digits
)
""", re.VERBOSE
)
def fnmatch(name, pat):
"""Test whether FILENAME matches PATTERN.
Patterns are Unix shell style:
- ``*`` matches everything except path separator
- ``**`` matches everything
- ``?`` matches any single character
- ``[seq]`` matches any character in seq
- ``[!seq]`` matches any char not in seq
- ``{s1,s2,s3}`` matches any of the strings given (separated by commas)
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.normpath(name).replace(os.sep, "/")
return fnmatchcase(name, pat)
def cached_translate(pat):
if not pat in _cache:
res, num_groups = translate(pat)
regex = re.compile(res)
_cache[pat] = regex, num_groups
return _cache[pat]
def fnmatchcase(name, pat):
"""Test whether FILENAME matches PATTERN, including case.
This is a version of fnmatch() which doesn't case-normalize
its arguments.
"""
regex, num_groups = cached_translate(pat)
match = regex.match(name)
if not match:
return False
pattern_matched = True
for (num, (min_num, max_num)) in zip(match.groups(), num_groups):
if num[0] == '0' or not (min_num <= int(num) <= max_num):
pattern_matched = False
break
return pattern_matched
def translate(pat, nested=False):
"""Translate a shell PATTERN to a regular expression.
There is no way to quote meta-characters.
"""
index, length = 0, len(pat) # Current index and length of pattern
brace_level = 0
in_brackets = False
result = ''
is_escaped = False
matching_braces = (len(LEFT_BRACE.findall(pat)) ==
len(RIGHT_BRACE.findall(pat)))
numeric_groups = []
while index < length:
current_char = pat[index]
index += 1
if current_char == '*':
pos = index
if pos < length and pat[pos] == '*':
result += '.*'
else:
result += '[^/]*'
elif current_char == '?':
result += '[^/]'
elif current_char == '[':
if in_brackets:
result += '\\['
else:
pos = index
has_slash = False
while pos < length and pat[pos] != ']':
if pat[pos] == '/' and pat[pos-1] != '\\':
has_slash = True
break
pos += 1
if has_slash:
result += '\\[' + pat[index:(pos + 1)]
index = pos + 1
else:
if index < length and pat[index] in '!^':
index += 1
result += '[^'
else:
result += '['
in_brackets = True
elif current_char == '-':
if in_brackets:
result += current_char
else:
result += '\\' + current_char
elif current_char == ']':
if in_brackets and pat[index-2] == '\\':
result += '\\]'
else:
result += current_char
in_brackets = False
elif current_char == '{':
pos = index
has_comma = False
while pos < length and (pat[pos] != '}' or is_escaped):
if pat[pos] == ',' and not is_escaped:
has_comma = True
break
is_escaped = pat[pos] == '\\' and not is_escaped
pos += 1
if not has_comma and pos < length:
num_range = NUMERIC_RANGE.match(pat[index:pos])
if num_range:
numeric_groups.append(map(int, num_range.groups()))
result += r"([+-]?\d+)"
else:
inner_result, inner_groups = translate(pat[index:pos],
nested=True)
result += '\\{%s\\}' % (inner_result,)
numeric_groups += inner_groups
index = pos + 1
elif matching_braces:
result += '(?:'
brace_level += 1
else:
result += '\\{'
elif current_char == ',':
if brace_level > 0 and not is_escaped:
result += '|'
else:
result += '\\,'
elif current_char == '}':
if brace_level > 0 and not is_escaped:
result += ')'
brace_level -= 1
else:
result += '\\}'
elif current_char == '/':
if pat[index:(index + 3)] == "**/":
result += "(?:/|/.*/)"
index += 3
else:
result += '/'
elif current_char != '\\':
result += re.escape(current_char)
if current_char == '\\':
if is_escaped:
result += re.escape(current_char)
is_escaped = not is_escaped
else:
is_escaped = False
if not nested:
result = r'(?s)%s\Z' % result
return result, numeric_groups
|
