i18n.py

# -*- coding: utf-8 -*-
import logging
from . import html5
from . import translations

_currentLanguage = None

if html5.jseval:
	_currentLanguage = html5.jseval("navigator.language")

	if not _currentLanguage:
		_currentLanguage = html5.jseval("navigator.browserLanguage")

if not _currentLanguage:
	_currentLanguage = "en"

if len(_currentLanguage) > 2:
	_currentLanguage = _currentLanguage[:2]

logging.info("_currentLanguage is %r", _currentLanguage)

_runtimeTranslations = {}
_lngMap = {}

#Populate the lng table
for key in dir( translations ):
	if key.startswith("lng"):
		_lngMap[ key[3:].lower() ] = { k.lower(): v for k,v in getattr( translations, key ).items() }


def translate( key, **kwargs ):
	"""
		Tries to translate the given string in the currently selected language.
		Supports replacing markers (using {markerName} syntax).

		:param key: The string to translate
		:type key: str
		:returns: The translated string
	"""
	def processTr( inStr, **kwargs ):
		for k,v in kwargs.items():
			inStr = inStr.replace("{%s}" % k, str(v))

		return inStr

	if _currentLanguage in _runtimeTranslations.keys():
		if key.lower() in _runtimeTranslations[_currentLanguage].keys():
			return processTr(_runtimeTranslations[_currentLanguage][key.lower()], **kwargs)

	if _currentLanguage in _lngMap.keys():
		if key.lower() in _lngMap[_currentLanguage].keys():
			return processTr(_lngMap[ _currentLanguage][key.lower()], **kwargs)

	return processTr(key, **kwargs)


def addTranslation( lang, a, b=None ):
	"""
		Adds or updates new translations.
	"""
	if not lang in _runtimeTranslations.keys():
		_runtimeTranslations[ lang ] = {}
	if isinstance(a,str) and b is not None:
		updateDict = { a.lower() : b }
	elif isinstance( a, dict ):
		updateDict = { k.lower(): v for k,v in a.items() }
	else:
		raise ValueError("Invalid call to addTranslation")
	_runtimeTranslations[ lang ].update( updateDict )

def setLanguage( lang ):
	"""
		Sets the current language to lang
	"""
	global _currentLanguage
	_currentLanguage = lang

def getLanguage():
	"""
	Returns the current language
	"""
	global _currentLanguage
	return _currentLanguage