/*
 * Mr. 4th Dimention - Allen Webster
 *
 * 20.02.2016
 *
 * GUI system for 4coder
 *
 */

// TOP

internal void
init_query_set(Query_Set *set){
    Query_Slot *slot = set->slots;
    set->free_slot = slot;
    set->used_slot = 0;
    for (i32 i = 0; i+1 < ArrayCount(set->slots); ++i, ++slot){
        slot->next = slot + 1;
    }
}

internal Query_Slot*
alloc_query_slot(Query_Set *set){
    Query_Slot *slot = set->free_slot;
    if (slot != 0){
        set->free_slot = slot->next;
        slot->next = set->used_slot;
        set->used_slot = slot;
    }
    return(slot);
}

internal void
free_query_slot(Query_Set *set, Query_Bar *match_bar){
    Query_Slot *slot = 0, *prev = 0;
    
    for (slot = set->used_slot; slot != 0; slot = slot->next){
        if (slot->query_bar == match_bar) break;
        prev = slot;
    }
    
    if (slot){
        if (prev){
            prev->next = slot->next;
        }
        else{
            set->used_slot = slot->next;
        }
        slot->next = set->free_slot;
        set->free_slot = slot;
    }
}

// BOTTOM