separate (Compilation_Unit.Produce_Metrics)
procedure Alignment_Clause
             (Current_Compilation_Unit : in out Ada_Compilation_Unit;
              Program_Unit : in Program_Unit_State_Machine;
              Halstead : in Halstead_State_Machine;
              Loc : in Loc_State_Machine;
              Mccabe : in Mccabe_State_Machine) is

    --================================================
    -- Alignment_Clause ::=
    --   "AT" "MOD" Expression ";"
    --================================================

    Current_Token : Token_Package.Token;

begin
    -- Alignment_Clause

    Get_Next_Token (Out_Token => Current_Token,
                    From => Current_Compilation_Unit,
                    Current_Loc => Loc);

    if "/=" (Token_Package.Value_Of (Current_Token),
             Token_Package.At_Token) then
        raise Syntax_Error;
    end if;

    Get_Next_Token (Out_Token => Current_Token,
                    From => Current_Compilation_Unit,
                    Current_Loc => Loc);

    if "/=" (Token_Package.Value_Of (Current_Token),
             Token_Package.Mod_Token) then
        raise Syntax_Error;
    end if;

    -- increment Halstead AT_MOD operator count
    Halstead.Store_Operator ((Kind => Halstead_Operator.At_Mod_Halstead));

    -- until ";" is found
    Expression
       (Current_Compilation_Unit => Current_Compilation_Unit,
        Program_Unit => Program_Unit,
        Halstead => Halstead,
        Loc => Loc,
        Mccabe => Mccabe,
        Terminate_Tokens => Set_Of_Tokens'(1 => Token_Package.Semicolon_Token));

    Get_Next_Token (Out_Token => Current_Token,
                    From => Current_Compilation_Unit,
                    Current_Loc => Loc);

    if "/=" (Token_Package.Value_Of (Current_Token),
             Token_Package.Semicolon_Token) then
        raise Syntax_Error;
    end if;

    -- increment Halstead SEMICOLON operator count
    Halstead.Store_Operator ((Kind => Halstead_Operator.Semicolon_Halstead));

end Alignment_Clause;