185 lines
6.8 KiB
Python
185 lines
6.8 KiB
Python
import decimal
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import datetime
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from django.conf import settings
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from django.utils import dateformat, numberformat, datetime_safe
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from django.utils.importlib import import_module
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from django.utils.encoding import smart_str
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from django.utils.functional import lazy
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from django.utils.safestring import mark_safe
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from django.utils.translation import get_language, to_locale, check_for_language
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# format_cache is a mapping from (format_type, lang) to the format string.
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# By using the cache, it is possible to avoid running get_format_modules
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# repeatedly.
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_format_cache = {}
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_format_modules_cache = {}
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def reset_format_cache():
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"""Clear any cached formats.
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This method is provided primarily for testing purposes,
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so that the effects of cached formats can be removed.
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"""
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global _format_cache, _format_modules_cache
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_format_cache = {}
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_format_modules_cache = {}
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def iter_format_modules(lang):
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"""
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Does the heavy lifting of finding format modules.
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"""
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if check_for_language(lang):
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format_locations = ['django.conf.locale.%s']
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if settings.FORMAT_MODULE_PATH:
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format_locations.append(settings.FORMAT_MODULE_PATH + '.%s')
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format_locations.reverse()
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locale = to_locale(lang)
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locales = [locale]
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if '_' in locale:
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locales.append(locale.split('_')[0])
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for location in format_locations:
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for loc in locales:
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try:
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yield import_module('.formats', location % loc)
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except ImportError:
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pass
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def get_format_modules(reverse=False):
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"""
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Returns a list of the format modules found
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"""
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lang = get_language()
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modules = _format_modules_cache.setdefault(lang, list(iter_format_modules(lang)))
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if reverse:
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return list(reversed(modules))
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return modules
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def get_format(format_type, lang=None, use_l10n=None):
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"""
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For a specific format type, returns the format for the current
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language (locale), defaults to the format in the settings.
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format_type is the name of the format, e.g. 'DATE_FORMAT'
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If use_l10n is provided and is not None, that will force the value to
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be localized (or not), overriding the value of settings.USE_L10N.
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"""
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format_type = smart_str(format_type)
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if use_l10n or (use_l10n is None and settings.USE_L10N):
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if lang is None:
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lang = get_language()
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cache_key = (format_type, lang)
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try:
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return _format_cache[cache_key] or getattr(settings, format_type)
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except KeyError:
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for module in get_format_modules():
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try:
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val = getattr(module, format_type)
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_format_cache[cache_key] = val
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return val
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except AttributeError:
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pass
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_format_cache[cache_key] = None
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return getattr(settings, format_type)
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get_format_lazy = lazy(get_format, unicode, list, tuple)
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def date_format(value, format=None, use_l10n=None):
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"""
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Formats a datetime.date or datetime.datetime object using a
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localizable format
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If use_l10n is provided and is not None, that will force the value to
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be localized (or not), overriding the value of settings.USE_L10N.
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"""
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return dateformat.format(value, get_format(format or 'DATE_FORMAT', use_l10n=use_l10n))
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def time_format(value, format=None, use_l10n=None):
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"""
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Formats a datetime.time object using a localizable format
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If use_l10n is provided and is not None, that will force the value to
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be localized (or not), overriding the value of settings.USE_L10N.
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"""
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return dateformat.time_format(value, get_format(format or 'TIME_FORMAT', use_l10n=use_l10n))
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def number_format(value, decimal_pos=None, use_l10n=None, force_grouping=False):
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"""
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Formats a numeric value using localization settings
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If use_l10n is provided and is not None, that will force the value to
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be localized (or not), overriding the value of settings.USE_L10N.
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"""
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if use_l10n or (use_l10n is None and settings.USE_L10N):
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lang = get_language()
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else:
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lang = None
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return numberformat.format(
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value,
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get_format('DECIMAL_SEPARATOR', lang, use_l10n=use_l10n),
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decimal_pos,
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get_format('NUMBER_GROUPING', lang, use_l10n=use_l10n),
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get_format('THOUSAND_SEPARATOR', lang, use_l10n=use_l10n),
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force_grouping=force_grouping
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)
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def localize(value, use_l10n=None):
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"""
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Checks if value is a localizable type (date, number...) and returns it
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formatted as a string using current locale format.
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If use_l10n is provided and is not None, that will force the value to
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be localized (or not), overriding the value of settings.USE_L10N.
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"""
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if isinstance(value, bool):
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return mark_safe(unicode(value))
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elif isinstance(value, (decimal.Decimal, float, int, long)):
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return number_format(value, use_l10n=use_l10n)
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elif isinstance(value, datetime.datetime):
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return date_format(value, 'DATETIME_FORMAT', use_l10n=use_l10n)
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elif isinstance(value, datetime.date):
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return date_format(value, use_l10n=use_l10n)
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elif isinstance(value, datetime.time):
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return time_format(value, 'TIME_FORMAT', use_l10n=use_l10n)
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else:
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return value
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def localize_input(value, default=None):
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"""
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Checks if an input value is a localizable type and returns it
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formatted with the appropriate formatting string of the current locale.
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"""
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if isinstance(value, (decimal.Decimal, float, int, long)):
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return number_format(value)
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elif isinstance(value, datetime.datetime):
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value = datetime_safe.new_datetime(value)
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format = smart_str(default or get_format('DATETIME_INPUT_FORMATS')[0])
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return value.strftime(format)
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elif isinstance(value, datetime.date):
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value = datetime_safe.new_date(value)
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format = smart_str(default or get_format('DATE_INPUT_FORMATS')[0])
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return value.strftime(format)
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elif isinstance(value, datetime.time):
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format = smart_str(default or get_format('TIME_INPUT_FORMATS')[0])
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return value.strftime(format)
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return value
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def sanitize_separators(value):
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"""
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Sanitizes a value according to the current decimal and
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thousand separator setting. Used with form field input.
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"""
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if settings.USE_L10N:
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decimal_separator = get_format('DECIMAL_SEPARATOR')
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if isinstance(value, basestring):
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parts = []
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if decimal_separator in value:
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value, decimals = value.split(decimal_separator, 1)
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parts.append(decimals)
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if settings.USE_THOUSAND_SEPARATOR:
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parts.append(value.replace(get_format('THOUSAND_SEPARATOR'), ''))
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else:
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parts.append(value)
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value = '.'.join(reversed(parts))
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return value
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