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util.py

"""
    babel.util
    ~~~~~~~~~~

Various utility classes and functions.

:copyright: (c) 2013-2023 by the Babel Team.
    :license: BSD, see LICENSE for more details.
"""
from __future__ import annotations

import codecs
import collections
import datetime
import os
import re
import textwrap
from collections.abc import Generator, Iterable
from typing import IO, Any, TypeVar

from babel import dates, localtime

missing = object()

_T = TypeVar("_T")

def distinct(iterable: Iterable[_T]) -> Generator[_T, None, None]:
    """Yield all items in an iterable collection that are distinct.

Unlike when using sets for a similar effect, the original ordering of the
    items in the collection is preserved by this function.

>>> print(list(distinct([1, 2, 1, 3, 4, 4])))
    [1, 2, 3, 4]
    >>> print(list(distinct('foobar')))
    ['f', 'o', 'b', 'a', 'r']

:param iterable: the iterable collection providing the data
    """
    seen = set()
    for item in iter(iterable):
        if item not in seen:
            yield item
            seen.add(item)

# Regexp to match python magic encoding line
PYTHON_MAGIC_COMMENT_re = re.compile(
    br'[ \t\f]* \# .* coding[=:][ \t]*([-\w.]+)', re.VERBOSE)

def parse_encoding(fp: IO[bytes]) -> str | None:
    """Deduce the encoding of a source file from magic comment.

It does this in the same way as the `Python interpreter`__

.. __: https://docs.python.org/3.4/reference/lexical_analysis.html#encoding-declarations

The ``fp`` argument should be a seekable file object.

(From Jeff Dairiki)
    """
    pos = fp.tell()
    fp.seek(0)
    try:
        line1 = fp.readline()
        has_bom = line1.startswith(codecs.BOM_UTF8)
        if has_bom:
            line1 = line1[len(codecs.BOM_UTF8):]

m = PYTHON_MAGIC_COMMENT_re.match(line1)
        if not m:
            try:
                import ast
                ast.parse(line1.decode('latin-1'))
            except (ImportError, SyntaxError, UnicodeEncodeError):
                # Either it's a real syntax error, in which case the source is
                # not valid python source, or line2 is a continuation of line1,
                # in which case we don't want to scan line2 for a magic
                # comment.
                pass
            else:
                line2 = fp.readline()
                m = PYTHON_MAGIC_COMMENT_re.match(line2)

if has_bom:
            if m:
                magic_comment_encoding = m.group(1).decode('latin-1')
                if magic_comment_encoding != 'utf-8':
                    raise SyntaxError(f"encoding problem: {magic_comment_encoding} with BOM")
            return 'utf-8'
        elif m:
            return m.group(1).decode('latin-1')
        else:
            return None
    finally:
        fp.seek(pos)

PYTHON_FUTURE_IMPORT_re = re.compile(
    r'from\s+__future__\s+import\s+$*(.+)$*')

def parse_future_flags(fp: IO[bytes], encoding: str = 'latin-1') -> int:
    """Parse the compiler flags by :mod:`__future__` from the given Python
    code.
    """
    import __future__
    pos = fp.tell()
    fp.seek(0)
    flags = 0
    try:
        body = fp.read().decode(encoding)

# Fix up the source to be (hopefully) parsable by regexpen.
        # This will likely do untoward things if the source code itself is broken.

# (1) Fix `import (\n...` to be `import (...`.
        body = re.sub(r'import\s*\([\r\n]+', 'import (', body)
        # (2) Join line-ending commas with the next line.
        body = re.sub(r',\s*[\r\n]+', ', ', body)
        # (3) Remove backslash line continuations.
        body = re.sub(r'\\\s*[\r\n]+', ' ', body)

for m in PYTHON_FUTURE_IMPORT_re.finditer(body):
            names = [x.strip().strip('()') for x in m.group(1).split(',')]
            for name in names:
                feature = getattr(__future__, name, None)
                if feature:
                    flags |= feature.compiler_flag
    finally:
        fp.seek(pos)
    return flags

def pathmatch(pattern: str, filename: str) -> bool:
    """Extended pathname pattern matching.

This function is similar to what is provided by the ``fnmatch`` module in
    the Python standard library, but:

* can match complete (relative or absolute) path names, and not just file
       names, and
     * also supports a convenience pattern ("**") to match files at any
       directory level.

Examples:

>>> pathmatch('**.py', 'bar.py')
    True
    >>> pathmatch('**.py', 'foo/bar/baz.py')
    True
    >>> pathmatch('**.py', 'templates/index.html')
    False

>>> pathmatch('./foo/**.py', 'foo/bar/baz.py')
    True
    >>> pathmatch('./foo/**.py', 'bar/baz.py')
    False

>>> pathmatch('^foo/**.py', 'foo/bar/baz.py')
    True
    >>> pathmatch('^foo/**.py', 'bar/baz.py')
    False

>>> pathmatch('**/templates/*.html', 'templates/index.html')
    True
    >>> pathmatch('**/templates/*.html', 'templates/foo/bar.html')
    False

:param pattern: the glob pattern
    :param filename: the path name of the file to match against
    """
    symbols = {
        '?': '[^/]',
        '?/': '[^/]/',
        '*': '[^/]+',
        '*/': '[^/]+/',
        '**/': '(?:.+/)*?',
        '**': '(?:.+/)*?[^/]+',
    }

if pattern.startswith('^'):
        buf = ['^']
        pattern = pattern[1:]
    elif pattern.startswith('./'):
        buf = ['^']
        pattern = pattern[2:]
    else:
        buf = []

for idx, part in enumerate(re.split('([?*]+/?)', pattern)):
        if idx % 2:
            buf.append(symbols[part])
        elif part:
            buf.append(re.escape(part))
    match = re.match(f"{''.join(buf)}$", filename.replace(os.sep, "/"))
    return match is not None

class TextWrapper(textwrap.TextWrapper):
    wordsep_re = re.compile(
        r'(\s+|'                                  # any whitespace
        r'(?<=[\w\!\"\'\&\.\,\?])-{2,}(?=\w))'    # em-dash
    )

def wraptext(text: str, width: int = 70, initial_indent: str = '', subsequent_indent: str = '') -> list[str]:
    """Simple wrapper around the ``textwrap.wrap`` function in the standard
    library. This version does not wrap lines on hyphens in words.

:param text: the text to wrap
    :param width: the maximum line width
    :param initial_indent: string that will be prepended to the first line of
                           wrapped output
    :param subsequent_indent: string that will be prepended to all lines save
                              the first of wrapped output
    """
    wrapper = TextWrapper(width=width, initial_indent=initial_indent,
                          subsequent_indent=subsequent_indent,
                          break_long_words=False)
    return wrapper.wrap(text)

# TODO (Babel 3.x): Remove this re-export
odict = collections.OrderedDict

class FixedOffsetTimezone(datetime.tzinfo):
    """Fixed offset in minutes east from UTC."""

def __init__(self, offset: float, name: str | None = None) -> None:

self._offset = datetime.timedelta(minutes=offset)
        if name is None:
            name = 'Etc/GMT%+d' % offset
        self.zone = name

def __str__(self) -> str:
        return self.zone

def __repr__(self) -> str:
        return f'<FixedOffset "{self.zone}" {self._offset}>'

def utcoffset(self, dt: datetime.datetime) -> datetime.timedelta:
        return self._offset

def tzname(self, dt: datetime.datetime) -> str:
        return self.zone

def dst(self, dt: datetime.datetime) -> datetime.timedelta:
        return ZERO

# Export the localtime functionality here because that's
# where it was in the past.
# TODO(3.0): remove these aliases
UTC = dates.UTC
LOCALTZ = dates.LOCALTZ
get_localzone = localtime.get_localzone
STDOFFSET = localtime.STDOFFSET
DSTOFFSET = localtime.DSTOFFSET
DSTDIFF = localtime.DSTDIFF
ZERO = localtime.ZERO

def _cmp(a: Any, b: Any):
    return (a > b) - (a < b)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-07-02 08:05:14
..	dir	-	root/root	drwxr-xr-x	2025-07-11 05:57:56
__pycache__	dir	-	root/root	drwxr-xr-x	2025-07-02 08:05:14
locale-data	dir	-	root/root	drwxr-xr-x	2025-07-02 08:05:14
localtime	dir	-	root/root	drwxr-xr-x	2025-07-02 08:05:14
messages	dir	-	root/root	drwxr-xr-x	2025-07-02 08:05:14
__init__.py	text/plain	863 B	root/root	-rw-r--r--	2025-06-09 11:12:39
core.py	text/plain	41.62 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
dates.py	text/plain	70.87 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
global.dat	application/octet-stream	254.07 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
languages.py	text/x-script.python	2.78 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
lists.py	text/plain	2.94 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
localedata.py	text/plain	8.05 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
numbers.py	text/plain	48.35 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
plural.py	text/plain	22.67 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
py.typed	text/plain	59 B	root/root	-rw-r--r--	2025-06-09 11:12:39
support.py	text/plain	25.62 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
units.py	text/x-script.python	11.6 KB	root/root	-rw-r--r--	2025-06-09 11:12:39
util.py	text/plain	7.77 KB	root/root	-rw-r--r--	2025-06-09 11:12:39