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Current File : /usr/lib/python3.6/site-packages/babel/localedata.py
# -*- coding: utf-8 -*-
"""
    babel.localedata
    ~~~~~~~~~~~~~~~~

    Low-level locale data access.

    :note: The `Locale` class, which uses this module under the hood, provides a
           more convenient interface for accessing the locale data.

    :copyright: (c) 2013 by the Babel Team.
    :license: BSD, see LICENSE for more details.
"""

import os
import re
import sys
import threading
from collections import MutableMapping
from itertools import chain
import sys

from babel._compat import pickle, string_types


def get_base_dir():
    if getattr(sys, 'frozen', False) and getattr(sys, '_MEIPASS', None):
        # we are running in a |PyInstaller| bundle
        basedir = sys._MEIPASS
    else:
        # we are running in a normal Python environment
        basedir = os.path.dirname(__file__)
    return basedir

_cache = {}
_cache_lock = threading.RLock()
_dirname = os.path.join(get_base_dir(), 'locale-data')
_windows_reserved_name_re = re.compile("^(con|prn|aux|nul|com[0-9]|lpt[0-9])$", re.I)


def normalize_locale(name):
    """Normalize a locale ID by stripping spaces and apply proper casing.

    Returns the normalized locale ID string or `None` if the ID is not
    recognized.
    """
    if not name or not isinstance(name, string_types):
        return None
    name = name.strip().lower()
    for locale_id in chain.from_iterable([_cache, locale_identifiers()]):
        if name == locale_id.lower():
            return locale_id


def resolve_locale_filename(name):
    """
    Resolve a locale identifier to a `.dat` path on disk.
    """

    # Clean up any possible relative paths.
    name = os.path.basename(name)

    # Ensure we're not left with one of the Windows reserved names.
    if sys.platform == "win32" and _windows_reserved_name_re.match(os.path.splitext(name)[0]):
        raise ValueError("Name %s is invalid on Windows" % name)

    # Build the path.
    return os.path.join(_dirname, '%s.dat' % name)


def exists(name):
    """Check whether locale data is available for the given locale.

    Returns `True` if it exists, `False` otherwise.

    :param name: the locale identifier string
    """
    if not name or not isinstance(name, string_types):
        return False
    if name in _cache:
        return True
    file_found = os.path.exists(resolve_locale_filename(name))
    return True if file_found else bool(normalize_locale(name))


def locale_identifiers():
    """Return a list of all locale identifiers for which locale data is
    available.

    .. versionadded:: 0.8.1

    :return: a list of locale identifiers (strings)
    """
    return [stem for stem, extension in [
        os.path.splitext(filename) for filename in os.listdir(_dirname)
    ] if extension == '.dat' and stem != 'root']


def load(name, merge_inherited=True):
    """Load the locale data for the given locale.

    The locale data is a dictionary that contains much of the data defined by
    the Common Locale Data Repository (CLDR). This data is stored as a
    collection of pickle files inside the ``babel`` package.

    >>> d = load('en_US')
    >>> d['languages']['sv']
    u'Swedish'

    Note that the results are cached, and subsequent requests for the same
    locale return the same dictionary:

    >>> d1 = load('en_US')
    >>> d2 = load('en_US')
    >>> d1 is d2
    True

    :param name: the locale identifier string (or "root")
    :param merge_inherited: whether the inherited data should be merged into
                            the data of the requested locale
    :raise `IOError`: if no locale data file is found for the given locale
                      identifer, or one of the locales it inherits from
    """
    name = os.path.basename(name)
    _cache_lock.acquire()
    try:
        data = _cache.get(name)
        if not data:
            # Load inherited data
            if name == 'root' or not merge_inherited:
                data = {}
            else:
                from babel.core import get_global
                parent = get_global('parent_exceptions').get(name)
                if not parent:
                    parts = name.split('_')
                    if len(parts) == 1:
                        parent = 'root'
                    else:
                        parent = '_'.join(parts[:-1])
                data = load(parent).copy()
            filename = resolve_locale_filename(name)
            with open(filename, 'rb') as fileobj:
                if name != 'root' and merge_inherited:
                    merge(data, pickle.load(fileobj))
                else:
                    data = pickle.load(fileobj)
            _cache[name] = data
        return data
    finally:
        _cache_lock.release()


def merge(dict1, dict2):
    """Merge the data from `dict2` into the `dict1` dictionary, making copies
    of nested dictionaries.

    >>> d = {1: 'foo', 3: 'baz'}
    >>> merge(d, {1: 'Foo', 2: 'Bar'})
    >>> sorted(d.items())
    [(1, 'Foo'), (2, 'Bar'), (3, 'baz')]

    :param dict1: the dictionary to merge into
    :param dict2: the dictionary containing the data that should be merged
    """
    for key, val2 in dict2.items():
        if val2 is not None:
            val1 = dict1.get(key)
            if isinstance(val2, dict):
                if val1 is None:
                    val1 = {}
                if isinstance(val1, Alias):
                    val1 = (val1, val2)
                elif isinstance(val1, tuple):
                    alias, others = val1
                    others = others.copy()
                    merge(others, val2)
                    val1 = (alias, others)
                else:
                    val1 = val1.copy()
                    merge(val1, val2)
            else:
                val1 = val2
            dict1[key] = val1


class Alias(object):
    """Representation of an alias in the locale data.

    An alias is a value that refers to some other part of the locale data,
    as specified by the `keys`.
    """

    def __init__(self, keys):
        self.keys = tuple(keys)

    def __repr__(self):
        return '<%s %r>' % (type(self).__name__, self.keys)

    def resolve(self, data):
        """Resolve the alias based on the given data.

        This is done recursively, so if one alias resolves to a second alias,
        that second alias will also be resolved.

        :param data: the locale data
        :type data: `dict`
        """
        base = data
        for key in self.keys:
            data = data[key]
        if isinstance(data, Alias):
            data = data.resolve(base)
        elif isinstance(data, tuple):
            alias, others = data
            data = alias.resolve(base)
        return data


class LocaleDataDict(MutableMapping):
    """Dictionary wrapper that automatically resolves aliases to the actual
    values.
    """

    def __init__(self, data, base=None):
        self._data = data
        if base is None:
            base = data
        self.base = base

    def __len__(self):
        return len(self._data)

    def __iter__(self):
        return iter(self._data)

    def __getitem__(self, key):
        orig = val = self._data[key]
        if isinstance(val, Alias):  # resolve an alias
            val = val.resolve(self.base)
        if isinstance(val, tuple):  # Merge a partial dict with an alias
            alias, others = val
            val = alias.resolve(self.base).copy()
            merge(val, others)
        if type(val) is dict:  # Return a nested alias-resolving dict
            val = LocaleDataDict(val, base=self.base)
        if val is not orig:
            self._data[key] = val
        return val

    def __setitem__(self, key, value):
        self._data[key] = value

    def __delitem__(self, key):
        del self._data[key]

    def copy(self):
        return LocaleDataDict(self._data.copy(), base=self.base)
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