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Rational R1000/400 Tapes

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Index: ┃ B T ┃

⟦63951dbd9⟧ TextFile

    Length: 1366 (0x556)
    Types: TextFile
    Names: »B«

Derivation

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

TextFile

with Object, More_Unary, Primary, Scanner;
package body Unary is

    type Node_Structure is
        record
            Rule : Natural range 0 .. 1 := 0;
            More : More_Unary.Node := More_Unary.Empty_Node;
            Prim : Primary.Node := Primary.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;
        Primary.Parse (N.Prim);
        Scanner.Next;
        if More_Unary.Is_First (Scanner.Get_Token) then
            N.Rule := 1;
            More_Unary.Parse (N.More);
        end if;
    end Parse;

    procedure Unparse (N : in Node) is
    begin
        Scanner.Set_Line_Number (N.Line);
        Primary.Unparse (N.Prim);
        if N.Rule = 1 then
            More_Unary.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 := Primary.Interpret (N.Prim);
            when 1 =>  
                Result := Primary.Interpret (N.Prim);
                Result := More_Unary.Interpret (N.More, Result);
        end case;
        return (Result);  
    end Interpret;
end Unary;