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import decimal
import datetime
from django.conf import settings
from django.utils.translation import get_language, to_locale, check_for_language
from django.utils.importlib import import_module
from django.utils.encoding import smart_str
from django.utils import dateformat, numberformat, datetime_safe
from django.utils.safestring import mark_safe
# format_cache is a mapping from (format_type, lang) to the format string.
# By using the cache, it is possible to avoid running get_format_modules
# repeatedly.
_format_cache = {}
_format_modules_cache = {}
def iter_format_modules(lang):
"""
Does the heavy lifting of finding format modules.
"""
if check_for_language(lang) or settings.USE_L10N:
format_locations = ['django.conf.locale.%s']
if settings.FORMAT_MODULE_PATH:
format_locations.append(settings.FORMAT_MODULE_PATH + '.%s')
format_locations.reverse()
locale = to_locale(lang)
locales = set((locale, locale.split('_')[0]))
for location in format_locations:
for loc in locales:
try:
yield import_module('.formats', location % loc)
except ImportError:
pass
def get_format_modules(reverse=False):
"""
Returns an iterator over the format modules found
"""
lang = get_language()
modules = _format_modules_cache.setdefault(lang, list(iter_format_modules(lang)))
if reverse:
modules.reverse()
return modules
def get_format(format_type):
"""
For a specific format type, returns the format for the current
language (locale), defaults to the format in the settings.
format_type is the name of the format, e.g. 'DATE_FORMAT'
"""
format_type = smart_str(format_type)
if settings.USE_L10N:
cache_key = (format_type, get_language())
try:
return _format_cache[cache_key] or getattr(settings, format_type)
except KeyError:
for module in get_format_modules():
try:
val = getattr(module, format_type)
_format_cache[cache_key] = val
return val
except AttributeError:
pass
_format_cache[cache_key] = None
return getattr(settings, format_type)
def date_format(value, format=None):
"""
Formats a datetime.date or datetime.datetime object using a
localizable format
"""
return dateformat.format(value, get_format(format or 'DATE_FORMAT'))
def time_format(value, format=None):
"""
Formats a datetime.time object using a localizable format
"""
return dateformat.time_format(value, get_format(format or 'TIME_FORMAT'))
def number_format(value, decimal_pos=None):
"""
Formats a numeric value using localization settings
"""
return numberformat.format(
value,
get_format('DECIMAL_SEPARATOR'),
decimal_pos,
get_format('NUMBER_GROUPING'),
get_format('THOUSAND_SEPARATOR'),
)
def localize(value):
"""
Checks if value is a localizable type (date, number...) and returns it
formatted as a string using current locale format
"""
if isinstance(value, bool):
return mark_safe(unicode(value))
elif isinstance(value, (decimal.Decimal, float, int, long)):
return number_format(value)
elif isinstance(value, datetime.datetime):
return date_format(value, 'DATETIME_FORMAT')
elif isinstance(value, datetime.date):
return date_format(value)
elif isinstance(value, datetime.time):
return time_format(value, 'TIME_FORMAT')
else:
return value
def localize_input(value, default=None):
"""
Checks if an input value is a localizable type and returns it
formatted with the appropriate formatting string of the current locale.
"""
if isinstance(value, (decimal.Decimal, float, int, long)):
return number_format(value)
if isinstance(value, datetime.datetime):
value = datetime_safe.new_datetime(value)
format = smart_str(default or get_format('DATETIME_INPUT_FORMATS')[0])
return value.strftime(format)
elif isinstance(value, datetime.date):
value = datetime_safe.new_date(value)
format = smart_str(default or get_format('DATE_INPUT_FORMATS')[0])
return value.strftime(format)
elif isinstance(value, datetime.time):
format = smart_str(default or get_format('TIME_INPUT_FORMATS')[0])
return value.strftime(format)
return value
def sanitize_separators(value):
"""
Sanitizes a value according to the current decimal and
thousand separator setting. Used with form field input.
"""
if settings.USE_L10N:
decimal_separator = get_format('DECIMAL_SEPARATOR')
if isinstance(value, basestring):
parts = []
if decimal_separator in value:
value, decimals = value.split(decimal_separator, 1)
parts.append(decimals)
if settings.USE_THOUSAND_SEPARATOR:
parts.append(value.replace(get_format('THOUSAND_SEPARATOR'), ''))
else:
parts.append(value)
value = '.'.join(reversed(parts))
return value
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