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# Copyright (C) 2009-2010 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""String utilities."""
from __future__ import absolute_import, unicode_literals
__metaclass__ = type
__all__ = [
'expand'
]
import logging
from string import Template
log = logging.getLogger('mailman.error')
def expand(template, substitutions, template_class=Template):
"""Expand string template with substitutions.
:param template: A PEP 292 $-string template.
:type template: string
:param substitutions: The substitutions dictionary.
:type substitutions: dict
:param template_class: The template class to use.
:type template_class: class
:return: The substituted string.
:rtype: string
"""
# Python 2.6 requires ** dictionaries to have str, not unicode keys, so
# convert as necessary. Note that string.Template uses **. For our
# purposes, keys should always be ascii. Values though can be anything.
cooked = substitutions.__class__()
for key in substitutions:
if isinstance(key, unicode):
key = key.encode('ascii')
cooked[key] = substitutions[key]
try:
return template_class(template).safe_substitute(cooked)
except (TypeError, ValueError):
# The template is really screwed up.
log.exception('broken template: %s', template)
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