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private with

    Ada.Containers.Vectors,
    Ada.Containers.Ordered_Sets;


generic

    type Label_Enum is (<>);
    type Element is private;
    type Element_Array is array (Positive range <>) of Element;

    with package Gen_Tokens is new Tokens (Label_Enum, Element, Element_Array);

package Packrat.Lexer is


    type Combinator_Result is private;

    type Combinator is access function
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    type Combinator_Array is array (Positive range <>) of Combinator;




    type Lexer_Context is private;

    Empty_Context : constant Lexer_Context;




    type Component_Result is private;

    type Component is access function
           (Input   : in     Element_Array;
            Context : in out Lexer_Context)
        return Component_Result;

    type Component_Array is array (Positive range <>) of Component;




    type With_Input is access function
           return Element_Array;




    generic
        Label : in Label_Enum;
        with function Combo
               (Input : in Element_Array;
                Start : in Positive)
            return Combinator_Result;
    function Stamp
           (Input   : in     Element_Array;
            Context : in out Lexer_Context)
        return Component_Result;

    generic
        Label : in Label_Enum;
        with function Combo
               (Input : in Element_Array;
                Start : in Positive)
            return Combinator_Result;
    function Ignore
           (Input   : in     Element_Array;
            Context : in out Lexer_Context)
        return Component_Result;




    generic
        Components : in Component_Array;
    function Scan
           (Input   : in     Element_Array;
            Context : in out Lexer_Context)
        return Gen_Tokens.Token_Array;

    generic
        Components : in Component_Array;
    function Scan_Only
           (Input   : in     Element_Array;
            Context : in out Lexer_Context)
        return Gen_Tokens.Token_Array;

    generic
        Components : in Component_Array;
    function Scan_With
           (Input   : in     With_Input;
            Context : in out Lexer_Context)
        return Gen_Tokens.Token_Array;

    generic
        Components : in Component_Array;
        Pad_In     : in Element;
        Pad_Out    : in Gen_Tokens.Token;
    procedure Scan_Set
           (Input   : in     Element_Array;
            Context : in out Lexer_Context;
            Output  :    out Gen_Tokens.Token_Array);

    generic
        Components : in Component_Array;
        Pad_In     : in Element;
        Pad_Out    : in Gen_Tokens.Token;
    procedure Scan_Set_With
           (Input   : in     With_Input;
            Context : in out Lexer_Context;
            Output  :    out Gen_Tokens.Token_Array);




    generic
        Params : in Combinator_Array;
    function Sequence
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        with function Param
               (Input : in Element_Array;
                Start : in Positive)
            return Combinator_Result;
        Number : in Positive;
    function Count
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        with function Param
               (Input : in Element_Array;
                Start : in Positive)
            return Combinator_Result;
        Minimum : in Natural := 0;
    function Many
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        with function Param
               (Input : in Element_Array;
                Start : in Positive)
            return Combinator_Result;
        with function Test
               (Item : in Element)
            return Boolean;
        Minimum : in Natural := 0;
    function Many_Until
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;




    generic
        with function Test
               (Item : in Element)
            return Boolean;
    function Satisfy
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        with function Test
               (Item : in Element)
            return Boolean;
        with function Change
               (From : in Element)
            return Element;
    function Satisfy_With
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        Item : in Element;
    function Match
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        Item : in Element;
        with function Change
               (From : in Element)
            return Element;
    function Match_With
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        Items : in Element_Array;
    function Multimatch
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        Number : in Positive := 1;
    function Take
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        with function Test
               (Item : in Element)
            return Boolean;
    function Take_While
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        with function Test
               (Item : in Element)
            return Boolean;
    function Take_Until
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;




    generic
        EOL_Item : in Element;
    function Line_End
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;

    generic
        EOF_Item : in Element;
    function Input_End
           (Input : in Element_Array;
            Start : in Positive)
        return Combinator_Result;


private


    package Token_Vectors is new Ada.Containers.Vectors
       (Index_Type   => Positive,
        Element_Type => Gen_Tokens.Token,
        "="          => Gen_Tokens."=");

    package Label_Vectors is new Ada.Containers.Vectors
       (Index_Type   => Positive,
        Element_Type => Label_Enum);

    package Label_Sets is new Ada.Containers.Ordered_Sets
       (Element_Type => Label_Enum);

    package Input_Holders is new Ada.Containers.Indefinite_Holders
       (Element_Type => Element_Array);




    type Combinator_Result is record
        Finish : Natural;
        Status : Result_Status;
    end record;

    Empty_Fail : constant Combinator_Result :=
       (Finish => 0,
        Status => Failure);




    type Component_Result is (Component_Failure, Component_Success);




    type Lexer_Context is record
        Result_So_Far    : Token_Vectors.Vector;
        Position         : Positive := 1;
        Offset           : Natural := 0;
        Status           : Result_Status := Success;
        Pass_Forward     : Input_Holders.Holder;
        Empty_Labels     : Label_Sets.Set;
        Error_Labels     : Label_Vectors.Vector;
        Allow_Incomplete : Boolean := True;
    end record;

    Empty_Context : constant Lexer_Context :=
       (Result_So_Far    => Token_Vectors.Empty_Vector,
        Position         => 1,
        Offset           => 0,
        Status           => Success,
        Pass_Forward     => Input_Holders.Empty_Holder,
        Empty_Labels     => Label_Sets.Empty_Set,
        Error_Labels     => Label_Vectors.Empty_Vector,
        Allow_Incomplete => True);


end Packrat.Lexer;