'Process the element\'s child elements in self.run.'

def _process_nests(self, element, block):

    nest_index = []
    i = (self.parser.blockprocessors.tag_counter + 1)
    while ((len(self._tag_data) > i) and self._tag_data[i][u'left_index']):
        left_child_index = self._tag_data[i][u'left_index']
        right_child_index = self._tag_data[i][u'right_index']
        nest_index.append(((left_child_index - 1), right_child_index))
        i += 1
    for (i, (left_index, right_index)) in enumerate(nest_index[:(-1)]):
        self.run(element, block[left_index:right_index], block[right_index:nest_index[(i + 1)][0]], True)
    self.run(element, block[nest_index[(-1)][0]:nest_index[(-1)][1]], block[nest_index[(-1)][1]:], True)
