allow :has() arguments start not solely from a combinator

Co-authored-by: Eugenio Lacuesta <1731933+elacuesta@users.noreply.github.com>

Author: 2 people

cssselect/parser.py

@@ -597,6 +597,8 @@ def parse_relative_selector(stream):
     next = stream.next()
     if next in [('DELIM', '+'), ('DELIM', '-'), ('DELIM', '>'), ('DELIM', '~')]:
         arguments.append(next)
+    elif next.type in ('IDENT', 'STRING', 'NUMBER'):
+        arguments.append(Element(element=next.value))
     while 1:
         stream.skip_whitespace()
         next = stream.next()

cssselect/xpath.py

@@ -274,7 +274,7 @@ def xpath_negation(self, negation):
 
     def xpath_relation(self, relation):
         xpath = self.xpath(relation.selector)
-        combinator, subselector, *_ = relation.subselector
+        combinator, subselector = relation.subselector
         method = getattr(self, 'xpath_%s_combinator' % self.combinator_mapping[combinator.value])
         return method(xpath, self.xpath(subselector))