#!/usr/bin/python2.5
#
# Copyright 2008 the Melange authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Common helper functions.
"""
__authors__ = [
'"Pawel Solyga" <pawel.solyga@gmail.com>',
]
import re
LINKNAME_PATTERN = r'''(?x)
^
[0-9a-z] # start with ASCII digit or lowercase
(
[0-9a-z] # additional ASCII digit or lowercase
| # -OR-
_[0-9a-z] # underscore and ASCII digit or lowercase
)* # zero or more of OR group
$
'''
LINKNAME_REGEX = re.compile(LINKNAME_PATTERN)
def isLinkNameFormatValid(link_name):
"""Returns True if link_name is in a valid format.
Args:
link_name: link name used in URLs for identification
"""
if LINKNAME_REGEX.match(link_name):
return True
return False