DataMuseum.dk

Presents historical artifacts from the history of:

Rational R1000/400 Tapes

This is an automatic "excavation" of a thematic subset of
artifacts from Datamuseum.dk's BitArchive.

See our Wiki for more about Rational R1000/400 Tapes

Excavated with: AutoArchaeologist - Free & Open Source Software. 

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Index: ┃ B T ┃

⟦adaac48ca⟧ TextFile

    Length: 1344 (0x540)
    Types: TextFile
    Names: »B«

Derivation

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

TextFile

with Object, Scanner, Unary, More_Binary;
package body Binary is

    type Node_Structure is
        record
            Rule : Natural range 0 .. 1 := 0;
            Unar : Unary.Node := Unary.Empty_Node;
            More : More_Binary.Node := More_Binary.Empty_Node;
            Line : Natural;
        end record;

    procedure Parse (N : in out Node) is
        use Scanner;  
    begin
        N := new Node_Structure;
        N.Line := Scanner.Get_Line_Number;
        Unary.Parse (N.Unar);
        if More_Binary.Is_First (Scanner.Get_Token) then
            N.Rule := 1;
            More_Binary.Parse (N => N.More);
        end if;  
    end Parse;

    procedure Unparse (N : in Node) is
    begin
        Scanner.Set_Line_Number (N.Line);
        Unary.Unparse (N.Unar);
        if N.Rule = 1 then
            More_Binary.Unparse (N.More);
        end if;
    end Unparse;

    function Interpret (N : Node) return Object.Reference is
        Result : Object.Reference;
    begin  
        Scanner.Set_Line_Number (N.Line);
        case N.Rule is
            when 0 =>
                Result := Unary.Interpret (N.Unar);
            when 1 =>
                Result := Unary.Interpret (N.Unar);  
                Result := More_Binary.Interpret (N.More, Result);
        end case;
        return Result;
    end Interpret;
end Binary;