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+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2020 Martin Owens <doctormo@gmail.com>
+# Sergei Izmailov <sergei.a.izmailov@gmail.com>
+# Ryan Jarvis <ryan@shopboxretail.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.
+#
+# pylint: disable=arguments-differ
+"""
+Interface for all group based elements such as Groups, Use, Markers etc.
+"""
+
+from lxml import etree # pylint: disable=unused-import
+
+from ..paths import Path
+from ..transforms import Transform
+
+from ._utils import addNS
+from ._base import ShapeElement
+
+try:
+ from typing import Optional # pylint: disable=unused-import
+except ImportError:
+ pass
+
+
+class GroupBase(ShapeElement):
+ """Base Group element"""
+
+ def get_path(self):
+ ret = Path()
+ for child in self:
+ if isinstance(child, ShapeElement):
+ ret += child.path.transform(child.transform)
+ return ret
+
+ def shape_box(self, transform=None):
+ bbox = None
+ effective_transform = Transform(transform) @ self.transform
+ for child in self:
+ if isinstance(child, ShapeElement):
+ child_bbox = child.bounding_box(transform=effective_transform)
+ if child_bbox is not None:
+ bbox += child_bbox
+ return bbox
+
+
+class Group(GroupBase):
+ """Any group element (layer or regular group)"""
+
+ tag_name = "g"
+
+ @classmethod
+ def new(cls, label, *children, **attrs):
+ attrs["inkscape:label"] = label
+ return super().new(*children, **attrs)
+
+ def effective_style(self):
+ """A blend of each child's style mixed together (last child wins)"""
+ style = self.style
+ for child in self:
+ style.update(child.effective_style())
+ return style
+
+ @property
+ def groupmode(self):
+ """Return the type of group this is"""
+ return self.get("inkscape:groupmode", "group")
+
+
+class Layer(Group):
+ """Inkscape extension of svg:g"""
+
+ def _init(self):
+ self.set("inkscape:groupmode", "layer")
+
+ @classmethod
+ def is_class_element(cls, elem):
+ # type: (etree.Element) -> bool
+ return elem.attrib.get(addNS("inkscape:groupmode"), None) == "layer"
+
+
+class Anchor(GroupBase):
+ """An anchor or link tag"""
+
+ tag_name = "a"
+
+ @classmethod
+ def new(cls, href, *children, **attrs):
+ attrs["xlink:href"] = href
+ return super().new(*children, **attrs)
+
+
+class ClipPath(GroupBase):
+ """A path used to clip objects"""
+
+ tag_name = "clipPath"
+
+
+class Marker(GroupBase):
+ """The <marker> element defines the graphic that is to be used for drawing
+ arrowheads or polymarkers on a given <path>, <line>, <polyline> or <polygon>
+ element."""
+
+ tag_name = "marker"
+
+
+class Mask(GroupBase):
+ """An alpha mask for compositing an object into the background
+
+ .. versionadded:: 1.2"""
+
+ tag_name = "mask"