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# Copyright (C) 1998,1999,2000,2001 by the Free Software Foundation, Inc.
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""A `safe' dictionary for string interpolation."""
from types import StringType
from UserDict import UserDict
class SafeDict(UserDict):
"""Dictionary which returns a default value for unknown keys.
This is used in maketext so that editing templates is a bit more robust.
"""
def __getitem__(self, key):
try:
return self.data[key]
except KeyError:
if type(key) == StringType:
return '%('+key+')s'
else:
return '<Missing key: %s>' % `key`
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