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+# -*- coding: utf-8 -*-
+# 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
+
+ def __str__(self):
+ return 'StringMerger: (append=%s)' % (self._append)
+
+ # 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 isinstance(value, (basestring)):
+ return merge_with
+ if not self._append:
+ return merge_with
+ if isinstance(value, unicode):
+ return value + unicode(merge_with)
+ else:
+ return value + str(merge_with)