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# Copyright (C) 2012 Codethink Limited
#
# 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; version 2 of the License.
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import logging
import re
class RepoAliasResolver(object):
def __init__(self, aliases):
self.aliases = aliases
def pull_url(self, reponame):
'''Expand a possibly shortened repo name to a pull url.'''
return self._expand_reponame(reponame, 'pullpat')
def push_url(self, reponame):
'''Expand a possibly shortened repo name to a push url.'''
return self._expand_reponame(reponame, 'pushpat')
def _expand_reponame(self, reponame, patname):
logging.debug('expanding: reponame=%s' % reponame)
logging.debug('expanding: patname=%s' % patname)
prefix, suffix = self._split_reponame(reponame)
logging.debug('expanding: prefix=%s' % prefix)
logging.debug('expanding: suffix=%s' % suffix)
# There was no prefix.
if prefix is None:
logging.debug('expanding: no prefix')
return reponame
pat = r'^(?P<prefix>[a-z0-9]+)=(?P<pullpat>[^#]+)#(?P<pushpat>[^#]+)$'
for alias in self.aliases:
logging.debug('expanding: alias="%s"' % alias)
m = re.match(pat, alias)
logging.debug('expanding: m=%s' % repr(m))
if m:
logging.debug('expanding: prefix group=%s' % m.group('prefix'))
if m and m.group('prefix') == prefix:
pullpat = m.group(patname)
logging.debug('expanding: pullpat=%s' % pullpat)
return self._apply_url_pattern(pullpat, suffix)
# Unknown prefix. Which means it may be a real URL instead.
# Let the caller deal with it.
logging.debug('expanding: unknown prefix')
return reponame
def _split_reponame(self, reponame):
'''Split reponame into prefix and suffix.
The prefix is returned as None if there was no prefix.
'''
pat = r'^(?P<prefix>[a-z0-9]+):(?P<rest>.*)$'
m = re.match(pat, reponame)
if m:
return m.group('prefix'), m.group('rest')
else:
return None, reponame
def _apply_url_pattern(self, pattern, shortname):
if '%s' in pattern:
return shortname.join(pattern.split('%s'))
else:
return pattern + shortname
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