# vi: ts=4 expandtab
#
#    Copyright (C) 2012 Yahoo! Inc.
#
#    Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3, as
#    published by the Free Software Foundation.
#
#    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, see <http://www.gnu.org/licenses/>.


class Merger(object):
    def __init__(self, merger, opts):
        self._append = 'append' in opts

    # On encountering a unicode object to merge value with
    # we will for now just proxy into the string method to let it handle it.
    def _on_unicode(self, value, merge_with):
        return self._on_str(value, merge_with)

    # On encountering a string object to merge with we will
    # perform the following action, if appending we will
    # merge them together, otherwise we will just return value.
    def _on_str(self, value, merge_with):
        if not self._append:
            return value
        else:
            if isinstance(value, (unicode)):
                return value + unicode(merge_with)
            else:
                return value + str(merge_with)