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__pycache__	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
asyncio	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
collections	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
concurrent	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
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curses	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
dbm	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
distutils	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
email	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
encodings	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
ensurepip	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
html	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
http	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
importlib	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
json	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
lib-dynload	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
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unittest	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
urllib	[ DIR ]	drwxr-xr-x	2023-12-23 09:51
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__future__.py	5.1 KB	-rw-r--r--	2023-08-24 12:09
__hello__.py	227 B	-rw-r--r--	2023-08-24 12:09
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abc.py	6.38 KB	-rw-r--r--	2023-08-24 12:09
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csv.py	15.65 KB	-rw-r--r--	2023-08-24 12:09
dataclasses.py	56.93 KB	-rw-r--r--	2023-08-24 12:09
datetime.py	89.85 KB	-rw-r--r--	2023-08-24 12:09
decimal.py	320 B	-rw-r--r--	2023-08-24 12:09
difflib.py	81.36 KB	-rw-r--r--	2023-08-24 12:09
dis.py	28.28 KB	-rw-r--r--	2023-08-24 12:09
doctest.py	102.72 KB	-rw-r--r--	2023-08-24 12:09
enum.py	76.83 KB	-rw-r--r--	2023-08-24 12:09
filecmp.py	9.94 KB	-rw-r--r--	2023-08-24 12:09
fileinput.py	15.35 KB	-rw-r--r--	2023-08-24 12:09
fnmatch.py	5.86 KB	-rw-r--r--	2023-08-24 12:09
fractions.py	28 KB	-rw-r--r--	2023-08-24 12:09
ftplib.py	34.66 KB	-rw-r--r--	2023-08-24 12:09
functools.py	37.51 KB	-rw-r--r--	2023-08-24 12:09
genericpath.py	4.86 KB	-rw-r--r--	2023-08-24 12:09
getopt.py	7.31 KB	-rw-r--r--	2023-08-24 12:09
getpass.py	5.85 KB	-rw-r--r--	2023-08-24 12:09
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glob.py	8.48 KB	-rw-r--r--	2023-08-24 12:09
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heapq.py	22.48 KB	-rw-r--r--	2023-08-24 12:09
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imghdr.py	3.86 KB	-rw-r--r--	2023-08-24 12:09
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io.py	4.14 KB	-rw-r--r--	2023-08-24 12:09
ipaddress.py	73.24 KB	-rw-r--r--	2023-08-24 12:09
keyword.py	1.04 KB	-rw-r--r--	2023-08-24 12:09
linecache.py	5.56 KB	-rw-r--r--	2023-08-24 12:09
locale.py	77.15 KB	-rw-r--r--	2023-08-24 12:09
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ntpath.py	29.51 KB	-rw-r--r--	2023-08-24 12:09
nturl2path.py	2.82 KB	-rw-r--r--	2023-08-24 12:09
numbers.py	10.11 KB	-rw-r--r--	2023-08-24 12:09
opcode.py	10.2 KB	-rw-r--r--	2023-08-24 12:09
operator.py	10.71 KB	-rw-r--r--	2023-08-24 12:09
optparse.py	58.95 KB	-rw-r--r--	2023-08-24 12:09
os.py	38.58 KB	-rw-r--r--	2023-08-24 12:09
pathlib.py	47.43 KB	-rw-r--r--	2023-08-24 12:09
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pickle.py	63.43 KB	-rw-r--r--	2023-08-24 12:09
pickletools.py	91.29 KB	-rw-r--r--	2023-08-24 12:09
pipes.py	8.77 KB	-rw-r--r--	2023-08-24 12:09
pkgutil.py	24.06 KB	-rw-r--r--	2023-08-24 12:09
platform.py	41.3 KB	-rwxr-xr-x	2023-08-24 12:09
plistlib.py	27.69 KB	-rw-r--r--	2023-08-24 12:09
poplib.py	14.84 KB	-rw-r--r--	2023-08-24 12:09
posixpath.py	16.61 KB	-rw-r--r--	2023-08-24 12:09
pprint.py	23.92 KB	-rw-r--r--	2023-08-24 12:09
profile.py	22.36 KB	-rwxr-xr-x	2023-08-24 12:09
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pydoc.py	106.6 KB	-rwxr-xr-x	2023-08-24 12:09
queue.py	11.23 KB	-rw-r--r--	2023-08-24 12:09
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random.py	31.41 KB	-rw-r--r--	2023-08-24 12:09
reprlib.py	5.31 KB	-rw-r--r--	2023-08-24 12:09
rlcompleter.py	7.64 KB	-rw-r--r--	2023-08-24 12:09
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sched.py	6.2 KB	-rw-r--r--	2023-08-24 12:09
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sndhdr.py	7.27 KB	-rw-r--r--	2023-08-24 12:09
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statistics.py	46.59 KB	-rw-r--r--	2023-08-24 12:09
string.py	11.51 KB	-rw-r--r--	2023-08-24 12:09
stringprep.py	12.61 KB	-rw-r--r--	2023-08-24 12:09
struct.py	257 B	-rw-r--r--	2023-08-24 12:09
subprocess.py	86.38 KB	-rw-r--r--	2023-08-24 12:09
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tabnanny.py	11.05 KB	-rwxr-xr-x	2023-08-24 12:09
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this.py	1003 B	-rw-r--r--	2023-08-24 12:09
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traceback.py	37.67 KB	-rw-r--r--	2023-08-24 12:09
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zipimport.py	30.17 KB	-rw-r--r--	2023-08-24 12:09

Rename

"""Cache lines from Python source files.

This is intended to read lines from modules imported -- hence if a filename
is not found, it will look down the module search path for a file by
that name.
"""

import functools
import sys
import os
import tokenize

__all__ = ["getline", "clearcache", "checkcache", "lazycache"]

# The cache. Maps filenames to either a thunk which will provide source code,
# or a tuple (size, mtime, lines, fullname) once loaded.
cache = {}

def clearcache():
    """Clear the cache entirely."""
    cache.clear()

def getline(filename, lineno, module_globals=None):
    """Get a line for a Python source file from the cache.
    Update the cache if it doesn't contain an entry for this file already."""

lines = getlines(filename, module_globals)
    if 1 <= lineno <= len(lines):
        return lines[lineno - 1]
    return ''

def getlines(filename, module_globals=None):
    """Get the lines for a Python source file from the cache.
    Update the cache if it doesn't contain an entry for this file already."""

if filename in cache:
        entry = cache[filename]
        if len(entry) != 1:
            return cache[filename][2]

try:
        return updatecache(filename, module_globals)
    except MemoryError:
        clearcache()
        return []

def checkcache(filename=None):
    """Discard cache entries that are out of date.
    (This is not checked upon each call!)"""

if filename is None:
        filenames = list(cache.keys())
    elif filename in cache:
        filenames = [filename]
    else:
        return

for filename in filenames:
        entry = cache[filename]
        if len(entry) == 1:
            # lazy cache entry, leave it lazy.
            continue
        size, mtime, lines, fullname = entry
        if mtime is None:
            continue   # no-op for files loaded via a __loader__
        try:
            stat = os.stat(fullname)
        except OSError:
            cache.pop(filename, None)
            continue
        if size != stat.st_size or mtime != stat.st_mtime:
            cache.pop(filename, None)

def updatecache(filename, module_globals=None):
    """Update a cache entry and return its list of lines.
    If something's wrong, print a message, discard the cache entry,
    and return an empty list."""

if filename in cache:
        if len(cache[filename]) != 1:
            cache.pop(filename, None)
    if not filename or (filename.startswith('<') and filename.endswith('>')):
        return []

fullname = filename
    try:
        stat = os.stat(fullname)
    except OSError:
        basename = filename

# Realise a lazy loader based lookup if there is one
        # otherwise try to lookup right now.
        if lazycache(filename, module_globals):
            try:
                data = cache[filename][0]()
            except (ImportError, OSError):
                pass
            else:
                if data is None:
                    # No luck, the PEP302 loader cannot find the source
                    # for this module.
                    return []
                cache[filename] = (
                    len(data),
                    None,
                    [line + '\n' for line in data.splitlines()],
                    fullname
                )
                return cache[filename][2]

# Try looking through the module search path, which is only useful
        # when handling a relative filename.
        if os.path.isabs(filename):
            return []

for dirname in sys.path:
            try:
                fullname = os.path.join(dirname, basename)
            except (TypeError, AttributeError):
                # Not sufficiently string-like to do anything useful with.
                continue
            try:
                stat = os.stat(fullname)
                break
            except OSError:
                pass
        else:
            return []
    try:
        with tokenize.open(fullname) as fp:
            lines = fp.readlines()
    except (OSError, UnicodeDecodeError, SyntaxError):
        return []
    if lines and not lines[-1].endswith('\n'):
        lines[-1] += '\n'
    size, mtime = stat.st_size, stat.st_mtime
    cache[filename] = size, mtime, lines, fullname
    return lines

def lazycache(filename, module_globals):
    """Seed the cache for filename with module_globals.

The module loader will be asked for the source only when getlines is
    called, not immediately.

If there is an entry in the cache already, it is not altered.

:return: True if a lazy load is registered in the cache,
        otherwise False. To register such a load a module loader with a
        get_source method must be found, the filename must be a cacheable
        filename, and the filename must not be already cached.
    """
    if filename in cache:
        if len(cache[filename]) == 1:
            return True
        else:
            return False
    if not filename or (filename.startswith('<') and filename.endswith('>')):
        return False
    # Try for a __loader__, if available
    if module_globals and '__name__' in module_globals:
        name = module_globals['__name__']
        if (loader := module_globals.get('__loader__')) is None:
            if spec := module_globals.get('__spec__'):
                try:
                    loader = spec.loader
                except AttributeError:
                    pass
        get_source = getattr(loader, 'get_source', None)

if name and get_source:
            get_lines = functools.partial(get_source, name)
            cache[filename] = (get_lines,)
            return True
    return False