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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2007 Edgewall Software
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4 # All rights reserved.
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5 #
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6 # This software is licensed as described in the file COPYING, which
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://babel.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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11 # individuals. For the exact contribution history, see the revision
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12 # history and logs, available at http://babel.edgewall.org/log/.
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13
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14 """Low-level locale data access.
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15
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16 :note: The `Locale` class, which uses this module under the hood, provides a
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17 more convenient interface for accessing the locale data.
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18 """
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19
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20 import os
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21 import pickle
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22 try:
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23 import threading
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24 except ImportError:
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25 import dummy_threading as threading
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26
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27 __all__ = ['exists', 'load']
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28 __docformat__ = 'restructuredtext en'
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29
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30 _cache = {}
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31 _cache_lock = threading.RLock()
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32 _dirname = os.path.join(os.path.dirname(__file__), 'localedata')
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33
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34 def exists(name):
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35 """Check whether locale data is available for the given locale.
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36
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37 :param name: the locale identifier string
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38 :return: `True` if the locale data exists, `False` otherwise
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39 :rtype: `bool`
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40 """
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41 if name in _cache:
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42 return True
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43 return os.path.exists(os.path.join(_dirname, '%s.dat' % name))
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44
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45 def load(name):
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46 """Load the locale data for the given locale.
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47
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48 The locale data is a dictionary that contains much of the data defined by
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49 the Common Locale Data Repository (CLDR). This data is stored as a
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50 collection of pickle files inside the ``babel`` package.
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51
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52 >>> d = load('en_US')
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53 >>> d['languages']['sv']
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54 u'Swedish'
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55
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56 Note that the results are cached, and subsequent requests for the same
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57 locale return the same dictionary:
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58
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59 >>> d1 = load('en_US')
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60 >>> d2 = load('en_US')
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61 >>> d1 is d2
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62 True
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63
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64 :param name: the locale identifier string (or "root")
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65 :return: the locale data
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66 :rtype: `dict`
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67 :raise `IOError`: if no locale data file is found for the given locale
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68 identifer, or one of the locales it inherits from
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69 """
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70 _cache_lock.acquire()
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71 try:
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72 data = _cache.get(name)
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73 if not data:
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74 # Load inherited data
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75 if name == 'root':
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76 data = {}
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77 else:
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78 parts = name.split('_')
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79 if len(parts) == 1:
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80 parent = 'root'
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81 else:
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82 parent = '_'.join(parts[:-1])
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83 data = load(parent).copy()
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84 filename = os.path.join(_dirname, '%s.dat' % name)
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85 fileobj = open(filename, 'rb')
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86 try:
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87 if name != 'root':
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88 merge(data, pickle.load(fileobj))
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89 else:
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90 data = pickle.load(fileobj)
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91 _cache[name] = data
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92 finally:
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93 fileobj.close()
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94 return data
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95 finally:
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96 _cache_lock.release()
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97
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98 def merge(dict1, dict2):
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99 """Merge the data from `dict2` into the `dict1` dictionary, making copies
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100 of nested dictionaries.
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101
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102 :param dict1: the dictionary to merge into
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103 :param dict2: the dictionary containing the data that should be merged
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104 """
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105 for key, value in dict2.items():
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106 if value:
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107 if type(value) is dict:
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108 dict1[key] = dict1.get(key, {}).copy()
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109 merge(dict1[key], value)
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110 else:
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111 dict1[key] = value
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