1 files changed, 61 insertions, 0 deletions
diff --git a/share/extensions/inkex/css.py b/share/extensions/inkex/css.py
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+++ b/share/extensions/inkex/css.py
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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()