1# Copyright (c) 2014-2021 Cedric Bellegarde <cedric.bellegarde@adishatz.org>
2# This program is free software: you can redistribute it and/or modify
3# it under the terms of the GNU General Public License as published by
4# the Free Software Foundation, either version 3 of the License, or
5# (at your option) any later version.
6# This program is distributed in the hope that it will be useful,
7# but WITHOUT ANY WARRANTY; without even the implied warranty of
8# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9# GNU General Public License for more details.
10# You should have received a copy of the GNU General Public License
11# along with this program. If not, see <http://www.gnu.org/licenses/>.
12
13from locale import getlocale, strcoll
14from importlib import import_module
15
16# Ugly magic to dynamically adapt to the current locale...
17try:
18    # Try loading 'index_of' function of the current locale
19    _module = import_module('lollypop.locales.%s' % getlocale()[0].lower())
20    index_of = _module.index_of
21except:
22    # In case the locale doesn't need special care, fall back to a naive
23    # implementation
24    def index_of(string):
25        """
26            Get index of a string in a locale-aware manner.
27            This is the fallback, which simply returns the first character.
28            @param string as str
29            @return str
30        """
31        if string:
32            return string[0]
33        else:
34            return ""
35
36
37class LocalizedCollation(object):
38    """
39        COLLATE LOCALIZED missing from default sqlite installation
40        Android only
41    """
42
43    def __init__(self):
44        pass
45
46    def __call__(self, v1, v2):
47        i1 = index_of(v1).upper()
48        i2 = index_of(v2).upper()
49        if strcoll(i1, i2) < 0:
50            return -1
51        elif strcoll(i1, i2) == 0:
52            return strcoll(v1, v2)
53        else:
54            return 1
55