parsing - Extracting order type from sql parser -

using global sql parser (gsp) extracting column , sorting type order sql query , extract , or condition

select employee_id, dept, name, age, salary employee_info dept = 'sales' , id=1 order salary, age desc,id; 

i can extracting column name can extract order type

1- how can extract order type?

2- how can extract , , or sql?

if psqlstmt gsp_selectstatement * can this:

if(psqlstmt->orderbyclause != nullptr) {            string sorttype;     int colnumorderby = psqlstmt->orderbyclause->items->length;      for(int = 0; < colnumorderby; i++)     {         gsp_orderbyitem *field = reinterpret_cast<gsp_orderbyitem *>(gsp_list_celldata(psqlstmt->orderbyclause->items->head));          //get order column name         char *sortcol = gsp_node_text(reinterpret_cast<gsp_node*>(field->sortkey));           if(field->sorttoken== nullptr)         {             //error         }         else         {             //find out sorting type (asc/desc)             sorttype = sorttype.substr(0,field->sorttoken->nstrlen);         }          free(sortcol);         psqlstmt->orderbyclause->items->head = psqlstmt->orderbyclause->items->head->nextcell;     }  }