Function my_xpath_parse_VariableReference

sql/item_xmlfunc.cc:2462–2508

*/

static int
my_xpath_parse_VariableReference(MY_XPATH *xpath)
{
  LEX_STRING name;
  int user_var;
  const char *dollar_pos;
  if (!my_xpath_parse_term(xpath, MY_XPATH_LEX_DOLLAR) ||
      (!(dollar_pos= xpath->prevtok.beg)) ||
      (!((user_var= my_xpath_parse_term(xpath, MY_XPATH_LEX_AT) &&
         my_xpath_parse_term(xpath, MY_XPATH_LEX_IDENT))) &&
       !my_xpath_parse_term(xpath, MY_XPATH_LEX_IDENT)))
    return 0;

  name.length= xpath->prevtok.end - xpath->prevtok.beg;
  name.str= (char*) xpath->prevtok.beg;
  
  if (user_var)
    xpath->item= new Item_func_get_user_var(Name_string(name, false));
  else
  {
    sp_variable *spv;
    sp_pcontext *spc;
    LEX *lex;
    if ((lex= current_thd->lex) &&
        (spc= lex->get_sp_current_parsing_ctx()) &&
        (spv= spc->find_variable(name, false)))
    {
      Item_splocal *splocal= new Item_splocal(Name_string(name, false),
                                              spv->offset, spv->type, 0);
#ifndef DBUG_OFF
      if (splocal)
        splocal->m_sp= lex->sphead;
#endif
      xpath->item= (Item*) splocal;
    }
    else
    {
      xpath->item= NULL;
      DBUG_ASSERT(xpath->query.end > dollar_pos);
      uint len= xpath->query.end - dollar_pos;
      set_if_smaller(len, 32);
      my_printf_error(ER_UNKNOWN_ERROR, "Unknown XPATH variable at: '%.*s'", 
                      MYF(0), len, dollar_pos);
    }
  }
  return xpath->item ? 1 : 0;
}


/*