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with expertSystem ; use expertSystem;

package instanceCounter is

    function newObject                           return long_integer;
    function newClass      ( name : className)   return positive;
    function newContext    ( name : contextName) return positive;
    function contextNumber ( name : contextName) return natural;
    function unknownClassName ( number : natural ) return className;

end instanceCounter;

package body instanceCounter is

   numObject  : long_integer := 0;

   sizeClass  : constant positive := className'LENGTH;
   numClass   : natural  := 0;
   namesClass : array(1..30) of string(1..sizeClass);


   sizeContext  : constant positive := contextName'LENGTH;
   numContext   : natural  := 0;
   namesContext : array(1..30) of string(1..sizeContext);

   function newObject return long_integer is
   begin
     numObject := numObject + 1;
     return numObject;
   end newObject;

   function newClass(name : className) return positive is
   ln    : positive := 1;
   aName : string(1..sizeClass);
   begin
      numClass := numClass + 1;
      if name'LENGTH > sizeClass then
         ln := sizeClass;
      else
         ln := name'LENGTH;
      end if;
      aName(1..ln) := name(1..ln);
      ln := ln + 1;
      while ln <= sizeClass loop
         aName(ln) := ' ';
         ln := ln + 1;
      end loop;
      namesClass(numClass):=aName;
      return numClass;
   end newClass;

   function newContext(name : contextName) return positive is
   ln    : positive := 1;
   aName : string(1..sizeContext);
   begin
      numContext := numContext + 1;
      if name'LENGTH > sizeContext then
         ln := sizeContext;
      else
         ln := name'LENGTH;
      end if;
      aName(1..ln) := name(1..ln);
      ln := ln + 1;
      while ln <= sizeContext loop
         aName(ln) := ' ';
         ln := ln + 1;
      end loop;
      namesContext(numContext):=aName;
      return numContext;
   end newContext;

   function contextNumber ( name : contextName) return natural is
   begin
      for i in 1..numContext loop
	if name = namesContext(i) then
	  return(i);
	end if;
      end loop;
      return(0);
   end contextNumber; 

   function unknownClassName(number : natural) return className is
   begin
        return namesClass(number);
   end unknownClassname;

end instanceCounter