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diff --git a/share/extensions/webslicer_effect.py b/share/extensions/webslicer_effect.py
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+#!/usr/bin/env python
+#
+# Copyright (C) 2010 Aurelio A. Heckert, aurium (a) gmail dot com
+#
+# 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 2 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+"""
+Common elements between webslicer extensions
+"""
+
+import inkex
+from inkex import Group
+
+
+def is_empty(val):
+ return val in ("", None)
+
+
+class WebSlicerMixin(object):
+ def get_slicer_layer(self, force_creation=False):
+ # Test if webslicer-layer layer existis
+ layer = self.svg.getElement(
+ '//*[@id="webslicer-layer" and @inkscape:groupmode="layer"]'
+ )
+ if layer is None:
+ if force_creation:
+ # Create a new layer
+ layer = Group(id="webslicer-layer")
+ layer.set("inkscape:label", "Web Slicer")
+ layer.set("inkscape:groupmode", "layer")
+ self.document.getroot().append(layer)
+ else:
+ layer = None
+ return layer
+
+ def get_conf_text_from_list(self, conf_atts):
+ conf_list = []
+ for att in conf_atts:
+ if not is_empty(getattr(self.options, att)):
+ conf_list.append(
+ att.replace("_", "-") + ": " + str(getattr(self.options, att))
+ )
+ return "\n".join(conf_list)