big filter refactoring

util/info.lua

@@ -384,4 +384,37 @@ function public.item(item_id, suffix_id)
         max_stack = max_stack,
         texture = texture,
     } or Aux.cache.item_info(item_id)
+end
+
+function public.item_class_index(item_class)
+    for i, class in ipairs({ GetAuctionItemClasses() }) do
+        if strupper(class) == strupper(item_class) then
+            return i
+        end
+    end
+end
+
+function public.item_subclass_index(class_index, item_subclass)
+    for i, subclass in ipairs({ GetAuctionItemSubClasses(class_index) }) do
+        if strupper(subclass) == strupper(item_subclass) then
+            return i
+        end
+    end
+end
+
+function public.item_slot_index(class_index, subclass_index, slot_name)
+    for i, slot in ipairs({ GetAuctionInvTypes(class_index, subclass_index) }) do
+        if strupper(getglobal(slot)) == strupper(slot_name) then
+            return i
+        end
+    end
+end
+
+function public.item_quality_index(item_quality)
+    for i=0,4 do
+        local quality = getglobal('ITEM_QUALITY'..i..'_DESC')
+        if strupper(item_quality) == strupper(quality) then
+            return i
+        end
+    end
 end