code: def visit_target(self, node):
          
          if self.lastref is None:
              return
          if (
              self.lastref.attributes['name'].lower() not in
              node.attributes['names'] and
              self.lastref.attributes['name'].lower() not in
              node.attributes['dupnames']
          ):
              # return if target doesn't match last reference found
              return
          if node.attributes['refuri'] not in self.replacements:
              # return if the refuri isn't in our replacement mapping
              return
          # ok, we have a node to replace...
          params = self.replacements[node.attributes['refuri']]
          meth = params[0]
          args = params[1:]
          # remove the target itself; we'll just replace the reference
          node.parent.remove(node)
          self.lastref.parent.replace(self.lastref, meth(*args))
docs: When we find a target node, first make sure it matches the last
          reference node we saw. Assuming it does, see if its refuri (link URI)
          is in our replacement list. If so, replace the link with an internal
          reference.