<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _generate_anchor_for(self, element, data_attribute, anchor_class):
 """ Generate an anchor for the element. :param element: The element. :type element: hatemile.util.html.htmldomelement.HTMLDOMElement :param data_attribute: The name of attribute that links the element with the anchor. :type data_attribute: str :param anchor_class: The HTML class of anchor. :type anchor_class: str :return: The anchor. :rtype: hatemile.util.html.htmldomelement.HTMLDOMElement """


        self.id_generator.generate_id(element)
        if self.parser.find(
            '[' + data_attribute + '="' + element.get_attribute('id') + '"]'
        ).first_result() is None:
            if element.get_tag_name() == 'A':
                anchor = element
            else:
                anchor = self.parser.create_element('a')
                self.id_generator.generate_id(anchor)
                anchor.set_attribute('class', anchor_class)
                element.insert_before(anchor)
            if not anchor.has_attribute('name'):
                anchor.set_attribute('name', anchor.get_attribute('id'))
            anchor.set_attribute(data_attribute, element.get_attribute('id'))
            return anchor
        return None