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language_support.py
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language_support.py
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#!/usr/bin/python3 -u
# -*- coding: utf-8 -*-
from utils import DictUtils as DU
dictI = DU.dictGetCaseInsensitive
class LanguageSupport(object):
"""A class handling dictionaries of strings in several languages"""
def __init__(self, lang=None, default_lang="EN"):
"""
:param lang: A language that will be extracted from a given message dictionary and returned by languageSupport()
:param default_lang: If a language given in `lang` is not provided in message dictionary, this language will be used instead
:return:
"""
super(LanguageSupport, self).__init__()
self.lang = lang
self.default_lang = default_lang
def languageSupport(self, message):
"""
Returns a message from a dictionary depending on a language chosen by user.
:param message: the message to process
If a string is given, it is returned as-is.
If a dictionary is given, a string with a key set in `self.lang` is given. If it is not in dictionary,
`self.default_lang` is uesd instead.
:raises KeyError: if neither `self.lang` nor `self.default_lang` are in the dictionary.
"""
lang = self.lang
if isinstance(message, str):
result = message
elif isinstance(message, dict):
try:
result = dictI(message, lang)
except KeyError:
try:
result = dictI(message, self.default_lang)
except KeyError:
raise KeyError("Message is not available neither in given language ({0}) nor in default one ({1})"
.format(self.lang, self.default_lang))
elif isinstance(message, list):
# could be a key markup
result = list(message)
for n, i in enumerate(message):
result[n] = self.languageSupport(i)
else:
result = ""
return result
@staticmethod
def allVariants(data):
"""
Returns a list of all translations, if data is a dictionary.
If it is a string, returns a list with one entry `data`.
Returns empty list for all other types.
:return: a list
"""
if isinstance(data, str):
return [data]
elif isinstance(data, dict):
return [i for i in data.values()]
else:
return list()