DataMuseum.dk

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    Length: 1387 (0x56b)
    Types: TextFile
    Names: »B«

└─⟦a7d1ea751⟧ Bits:30000550 8mm tape, Rational 1000, !users!projects 94_04_11
    └─⟦129cab021⟧ »DATA« 
        └─⟦this⟧ 

TextFile

with Errors;
with More_Binary;
with Trace;
with Unary;

package body Binary is

    type Node_Structure is
        record
            Line : Natural;
            Unar : Unary.Node := Unary.Empty_Node;
            More : More_Binary.Node := More_Binary.Empty_Node;
        end record;

    procedure Parse (N : in out Node) is
    begin
        Trace.Display ("parsing Binary");
        N := new Node_Structure;
        N.Line := Scanner.Get_Line_Number;
        if Unary.Is_First (Scanner.Get_Token) then
            Unary.Parse (N.Unar);
            More_Binary.Parse (N.More);
        else
            raise Errors.Expecting_Unary;
        end if;
    end Parse;

    procedure Unparse (N : Node) is
    begin
        Unary.Unparse (N.Unar);
        More_Binary.Unparse (N.More);
        Trace.Display ("fin unparse binary");
    end Unparse;

    function Is_First (T : Scanner.Token) return Boolean is
        use Scanner;
    begin
        return Unary.Is_First (T);
    end Is_First;

    function Interpret (N : Node) return Object.Reference is
        Result : Object.Reference;
    begin  
        Errors.Save_Interpret_Line (N.Line);
        Result := Unary.Interpret (N.Unar);
        Result := More_Binary.Interpret (N.More, Result);
        Trace.Display ("fin interpretation Binary");
        Trace.Display (Result);
        return Result;
    end Interpret;

end Binary;