# vim: set fileencoding=utf-8 :
#
# (C) 2013 Guido Günther <agx@sigxcpu.org>
#    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 3 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
#
# Some Pom parsing handling

class Version(object):
    def __init__(self, text):
        self._version = text.strip()

    def is_subst(self):
        """
        Wheter a version is subject to variable substitution

        >>> Version('1.0').is_subst()
        False
        >>> Version('${version}').is_subst()
        True
        >>> Version('foo-${version}-bar').is_subst()
        True
        >>> Version('${version}-bar').is_subst()
        True
        >>> Version('foo-${version}').is_subst()
        True
        """
        if '${' in self._version:
            return True if '}' in self._version.split('${')[1] else False
        else:
            return False

    def is_snapshot(self):
        """
        Wheter a version is a snapthot version

        >>> Version('1.0').is_snapshot()
        False
        >>> Version('1.0-SNAPSHOT').is_snapshot()
        True
        """
        return self._version.endswith('-SNAPSHOT')

    def __str__(self):
        return self._version

    def __eq__(self, arg):
        # Make sure we can compare versions in string context
        if isinstance(arg, (str, unicode)):
            return self._version.__eq__(arg)
        else:
            return super(Version, self).__eq__(arg)