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+# coding=utf-8
+#
+# Copyright (C) 2021 - Jonathan Neuhauser <jonathan.neuhauser@outlook.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.
+#
+
+"""Toplevel CSS utils that do not depend on other inkex functionality
+
+.. versionadded:: 1.2
+ Previously a part of :py:mod:`inkex.styles`"""
+
+
+import re
+import cssselect
+
+
+class ConditionalRule:
+ """A single css rule
+
+ .. versionchanged:: 1.2
+ The CSS rule is now processed using cssselect."""
+
+ step_to_xpath = [
+ # namespace addition
+ (re.compile(r"(::|\/)([a-z]+)(?=\W)(?!-)"), r"\1svg:\2"),
+ ]
+
+ def __init__(self, rule):
+ self.rule = rule.strip()
+ self.selector = cssselect.parse(self.rule)[0]
+
+ def __str__(self):
+ return self.rule
+
+ def to_xpath(self):
+ """Attempt to convert the rule into a simplified xpath"""
+ # the space in the end is needed for the negative lookbehind in the regex, will
+ # be removed on return
+ ret = cssselect.HTMLTranslator().selector_to_xpath(self.selector) + " "
+ for matcher, replacer in self.step_to_xpath:
+ ret = matcher.sub(replacer, ret)
+ return ret.strip()
+
+ def get_specificity(self):
+ """gets the css specificity of this selector
+
+ .. versionadded:: 1.2"""
+ return self.selector.specificity()