Mini Shell
"""distutils.filelist
Provides the FileList class, used for poking about the filesystem
and building lists of files.
"""
import fnmatch
import functools
import os
import re
from ._log import log
from .errors import DistutilsInternalError, DistutilsTemplateError
from .util import convert_path
class FileList:
"""A list of files built by on exploring the filesystem and filtered by
applying various patterns to what we find there.
Instance attributes:
dir
directory from which files will be taken -- only used if
'allfiles' not supplied to constructor
files
list of filenames currently being built/filtered/manipulated
allfiles
complete list of files under consideration (ie. without any
filtering applied)
"""
def __init__(self, warn=None, debug_print=None):
# ignore argument to FileList, but keep them for backwards
# compatibility
self.allfiles = None
self.files = []
def set_allfiles(self, allfiles):
self.allfiles = allfiles
def findall(self, dir=os.curdir):
self.allfiles = findall(dir)
def debug_print(self, msg):
"""Print 'msg' to stdout if the global DEBUG (taken from the
DISTUTILS_DEBUG environment variable) flag is true.
"""
from distutils.debug import DEBUG
if DEBUG:
print(msg)
# Collection methods
def append(self, item):
self.files.append(item)
def extend(self, items):
self.files.extend(items)
def sort(self):
# Not a strict lexical sort!
sortable_files = sorted(map(os.path.split, self.files))
self.files = []
for sort_tuple in sortable_files:
self.files.append(os.path.join(*sort_tuple))
# Other miscellaneous utility methods
def remove_duplicates(self):
# Assumes list has been sorted!
for i in range(len(self.files) - 1, 0, -1):
if self.files[i] == self.files[i - 1]:
del self.files[i]
# "File template" methods
def _parse_template_line(self, line):
words = line.split()
action = words[0]
patterns = dir = dir_pattern = None
if action in ('include', 'exclude', 'global-include', 'global-exclude'):
if len(words) < 2:
raise DistutilsTemplateError(
f"'{action}' expects <pattern1> <pattern2> ..."
)
patterns = [convert_path(w) for w in words[1:]]
elif action in ('recursive-include', 'recursive-exclude'):
if len(words) < 3:
raise DistutilsTemplateError(
f"'{action}' expects <dir> <pattern1> <pattern2> ..."
)
dir = convert_path(words[1])
patterns = [convert_path(w) for w in words[2:]]
elif action in ('graft', 'prune'):
if len(words) != 2:
raise DistutilsTemplateError(
f"'{action}' expects a single <dir_pattern>"
)
dir_pattern = convert_path(words[1])
else:
raise DistutilsTemplateError(f"unknown action '{action}'")
return (action, patterns, dir, dir_pattern)
def process_template_line(self, line): # noqa: C901
# Parse the line: split it up, make sure the right number of words
# is there, and return the relevant words. 'action' is always
# defined: it's the first word of the line. Which of the other
# three are defined depends on the action; it'll be either
# patterns, (dir and patterns), or (dir_pattern).
(action, patterns, dir, dir_pattern) = self._parse_template_line(line)
# OK, now we know that the action is valid and we have the
# right number of words on the line for that action -- so we
# can proceed with minimal error-checking.
if action == 'include':
self.debug_print("include " + ' '.join(patterns))
for pattern in patterns:
if not self.include_pattern(pattern, anchor=True):
log.warning("warning: no files found matching '%s'", pattern)
elif action == 'exclude':
self.debug_print("exclude " + ' '.join(patterns))
for pattern in patterns:
if not self.exclude_pattern(pattern, anchor=True):
log.warning(
(
"warning: no previously-included files "
"found matching '%s'"
),
pattern,
)
elif action == 'global-include':
self.debug_print("global-include " + ' '.join(patterns))
for pattern in patterns:
if not self.include_pattern(pattern, anchor=False):
log.warning(
(
"warning: no files found matching '%s' "
"anywhere in distribution"
),
pattern,
)
elif action == 'global-exclude':
self.debug_print("global-exclude " + ' '.join(patterns))
for pattern in patterns:
if not self.exclude_pattern(pattern, anchor=False):
log.warning(
(
"warning: no previously-included files matching "
"'%s' found anywhere in distribution"
),
pattern,
)
elif action == 'recursive-include':
self.debug_print("recursive-include {} {}".format(dir, ' '.join(patterns)))
for pattern in patterns:
if not self.include_pattern(pattern, prefix=dir):
msg = "warning: no files found matching '%s' under directory '%s'"
log.warning(msg, pattern, dir)
elif action == 'recursive-exclude':
self.debug_print("recursive-exclude {} {}".format(dir, ' '.join(patterns)))
for pattern in patterns:
if not self.exclude_pattern(pattern, prefix=dir):
log.warning(
(
"warning: no previously-included files matching "
"'%s' found under directory '%s'"
),
pattern,
dir,
)
elif action == 'graft':
self.debug_print("graft " + dir_pattern)
if not self.include_pattern(None, prefix=dir_pattern):
log.warning("warning: no directories found matching '%s'", dir_pattern)
elif action == 'prune':
self.debug_print("prune " + dir_pattern)
if not self.exclude_pattern(None, prefix=dir_pattern):
log.warning(
("no previously-included directories found matching '%s'"),
dir_pattern,
)
else:
raise DistutilsInternalError(
f"this cannot happen: invalid action '{action}'"
)
# Filtering/selection methods
def include_pattern(self, pattern, anchor=True, prefix=None, is_regex=False):
"""Select strings (presumably filenames) from 'self.files' that
match 'pattern', a Unix-style wildcard (glob) pattern. Patterns
are not quite the same as implemented by the 'fnmatch' module: '*'
and '?' match non-special characters, where "special" is platform-
dependent: slash on Unix; colon, slash, and backslash on
DOS/Windows; and colon on Mac OS.
If 'anchor' is true (the default), then the pattern match is more
stringent: "*.py" will match "foo.py" but not "foo/bar.py". If
'anchor' is false, both of these will match.
If 'prefix' is supplied, then only filenames starting with 'prefix'
(itself a pattern) and ending with 'pattern', with anything in between
them, will match. 'anchor' is ignored in this case.
If 'is_regex' is true, 'anchor' and 'prefix' are ignored, and
'pattern' is assumed to be either a string containing a regex or a
regex object -- no translation is done, the regex is just compiled
and used as-is.
Selected strings will be added to self.files.
Return True if files are found, False otherwise.
"""
# XXX docstring lying about what the special chars are?
files_found = False
pattern_re = translate_pattern(pattern, anchor, prefix, is_regex)
self.debug_print(f"include_pattern: applying regex r'{pattern_re.pattern}'")
# delayed loading of allfiles list
if self.allfiles is None:
self.findall()
for name in self.allfiles:
if pattern_re.search(name):
self.debug_print(" adding " + name)
self.files.append(name)
files_found = True
return files_found
def exclude_pattern(self, pattern, anchor=True, prefix=None, is_regex=False):
"""Remove strings (presumably filenames) from 'files' that match
'pattern'. Other parameters are the same as for
'include_pattern()', above.
The list 'self.files' is modified in place.
Return True if files are found, False otherwise.
"""
files_found = False
pattern_re = translate_pattern(pattern, anchor, prefix, is_regex)
self.debug_print(f"exclude_pattern: applying regex r'{pattern_re.pattern}'")
for i in range(len(self.files) - 1, -1, -1):
if pattern_re.search(self.files[i]):
self.debug_print(" removing " + self.files[i])
del self.files[i]
files_found = True
return files_found
# Utility functions
def _find_all_simple(path):
"""
Find all files under 'path'
"""
all_unique = _UniqueDirs.filter(os.walk(path, followlinks=True))
results = (
os.path.join(base, file) for base, dirs, files in all_unique for file in files
)
return filter(os.path.isfile, results)
class _UniqueDirs(set):
"""
Exclude previously-seen dirs from walk results,
avoiding infinite recursion.
Ref https://bugs.python.org/issue44497.
"""
def __call__(self, walk_item):
"""
Given an item from an os.walk result, determine
if the item represents a unique dir for this instance
and if not, prevent further traversal.
"""
base, dirs, files = walk_item
stat = os.stat(base)
candidate = stat.st_dev, stat.st_ino
found = candidate in self
if found:
del dirs[:]
self.add(candidate)
return not found
@classmethod
def filter(cls, items):
return filter(cls(), items)
def findall(dir=os.curdir):
"""
Find all files under 'dir' and return the list of full filenames.
Unless dir is '.', return full filenames with dir prepended.
"""
files = _find_all_simple(dir)
if dir == os.curdir:
make_rel = functools.partial(os.path.relpath, start=dir)
files = map(make_rel, files)
return list(files)
def glob_to_re(pattern):
"""Translate a shell-like glob pattern to a regular expression; return
a string containing the regex. Differs from 'fnmatch.translate()' in
that '*' does not match "special characters" (which are
platform-specific).
"""
pattern_re = fnmatch.translate(pattern)
# '?' and '*' in the glob pattern become '.' and '.*' in the RE, which
# IMHO is wrong -- '?' and '*' aren't supposed to match slash in Unix,
# and by extension they shouldn't match such "special characters" under
# any OS. So change all non-escaped dots in the RE to match any
# character except the special characters (currently: just os.sep).
sep = os.sep
if os.sep == '\\':
# we're using a regex to manipulate a regex, so we need
# to escape the backslash twice
sep = r'\\\\'
escaped = rf'\1[^{sep}]'
pattern_re = re.sub(r'((?<!\\)(\\\\)*)\.', escaped, pattern_re)
return pattern_re
def translate_pattern(pattern, anchor=True, prefix=None, is_regex=False):
"""Translate a shell-like wildcard pattern to a compiled regular
expression. Return the compiled regex. If 'is_regex' true,
then 'pattern' is directly compiled to a regex (if it's a string)
or just returned as-is (assumes it's a regex object).
"""
if is_regex:
if isinstance(pattern, str):
return re.compile(pattern)
else:
return pattern
# ditch start and end characters
start, _, end = glob_to_re('_').partition('_')
if pattern:
pattern_re = glob_to_re(pattern)
assert pattern_re.startswith(start) and pattern_re.endswith(end)
else:
pattern_re = ''
if prefix is not None:
prefix_re = glob_to_re(prefix)
assert prefix_re.startswith(start) and prefix_re.endswith(end)
prefix_re = prefix_re[len(start) : len(prefix_re) - len(end)]
sep = os.sep
if os.sep == '\\':
sep = r'\\'
pattern_re = pattern_re[len(start) : len(pattern_re) - len(end)]
pattern_re = rf'{start}\A{prefix_re}{sep}.*{pattern_re}{end}'
else: # no prefix -- respect anchor flag
if anchor:
pattern_re = rf'{start}\A{pattern_re[len(start) :]}'
return re.compile(pattern_re)
Zerion Mini Shell 1.0