aboutsummaryrefslogtreecommitdiffstats
path: root/jython-tosca-parser/src/main/resources/Lib/site-packages/babel-2.3.4-py2.7.egg/babel/localedata.py
blob: 9c6f9f2b955a0efd7767e3c985a23265aed2e941 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
# -*- 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 threading
from collections import MutableMapping
from itertools import chain

from babel._compat import pickle


_cache = {}
_cache_lock = threading.RLock()
_dirname = os.path.join(os.path.dirname(__file__), 'locale-data')


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.
    """
    name = name.strip().lower()
    for locale_id in chain.from_iterable([_cache, locale_identifiers()]):
        if name == locale_id.lower():
            return locale_id


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 name in _cache:
        return True
    file_found = os.path.exists(os.path.join(_dirname, '%s.dat' % 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
    """
    _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 = os.path.join(_dirname, '%s.dat' % name)
            fileobj = open(filename, 'rb')
            try:
                if name != 'root' and merge_inherited:
                    merge(data, pickle.load(fileobj))
                else:
                    data = pickle.load(fileobj)
                _cache[name] = data
            finally:
                fileobj.close()
        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)