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TextFile

package Conditions is  
    Max_Term_Count : constant := 5;
    subtype Term_Count is Natural range 0 .. Max_Term_Count;

    type Object (Count : Term_Count := 0) is private;

    type Alias is (A, B, C, D, E, F, G, H, I, J, K, L, M,
                   N, O, P, Q, R, S, T, U, V, W, X, Y, Z);

    -- value conditions

    function Is_Equal            (Value : Integer) return Conditions.Object;
    function Is_Less             (Value : Integer) return Conditions.Object;
    function Is_Less_Or_Equal    (Value : Integer) return Conditions.Object;
    function Is_Greater          (Value : Integer) return Conditions.Object;
    function Is_Greater_Or_Equal (Value : Integer) return Conditions.Object;
    function Is_Different        (Value : Integer) return Conditions.Object;

    -- alias conditions

    function Is_Equal            (Value : Alias) return Conditions.Object;
    function Is_Less             (Value : Alias) return Conditions.Object;
    function Is_Less_Or_Equal    (Value : Alias) return Conditions.Object;
    function Is_Greater          (Value : Alias) return Conditions.Object;
    function Is_Greater_Or_Equal (Value : Alias) return Conditions.Object;
    function Is_Different        (Value : Alias) return Conditions.Object;

    -- miscellaneous conditions

    function Is_Any                     return Conditions.Object;
    function Say_It_Is (Object : Alias) return Conditions.Object;

    -- others

    function "and" (Left, Right : Conditions.Object) return Conditions.Object;
    function Match (Value : Integer; Against : Conditions.Object)
                   return Boolean;
private  
    type Operators is (
                       -- value operators

                       Is_Equal, Is_Less, Is_Less_Or_Equal,
                       Is_Greater, Is_Greater_Or_Equal, Is_Different,

                       --  alias operators

                       Is_Equal_To_Alias, Is_Less_Than_Alias,
                       Is_Less_Or_Equal_Than_Alias, Is_Greater_Than_Alias,
                       Is_Greater_Or_Equal_Than_Alias, Is_Different_Than_Alias,

                       -- miscellaneous operators

                       Is_Any, Say_It_Is);

    subtype Value_Operators         is Operators range Is_Equal .. Is_Different;
    subtype Alias_Operators         is
       Operators range Is_Equal_To_Alias .. Is_Different_Than_Alias;
    subtype Miscellaneous_Operators is Operators range Is_Any .. Say_It_Is;

    type Condition_Element is
        record
            Operator : Operators;
            Operand  : Integer;
        end record;

    type Condition_Elements is array (Positive range <>) of Condition_Element;

    type Object (Count : Term_Count := 0) is
        record
            Value : Condition_Elements (1 .. Count);
        end record;
end Conditions;