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    Length: 2761 (0xac9)
    Types: TextFile
    Names: »B«

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

TextFile

with Text_Io;
with Lex;
with Object;
with Error_Broadcaster;
with Statements;
with Arguments;
with Bloc_Class;  
with String_Utilities;
with Bounded_String;
package body Bloc is

    type Node_Structure is
        record
            Rule : Natural range 0 .. 1 := 0;
            Arg : Arguments.Node := Arguments.Empty_Node;
            State : Statements.Node := Statements.Empty_Node;
        end record;

    procedure Open (N : in out Node) is
    begin  
        Bloc_Class.Set (N);
    end Open;
    procedure Parse (N : in out Node; Error : out Boolean) is
        Failed : Boolean := False;

    begin
        N := new Node_Structure;
        if Lex.Token'Pos (Lex.Get_Token) = Lex.Token'Pos (Lex.Open_Bracket) then
            Open (N);
            N.Rule := 1;  
            Lex.Next_Token;
            Arguments.Parse (N.Arg, Failed);
            if not Failed then
                Statements.Parse (N.State, Failed);
                if not Failed then
                    if Lex.Token'Pos (Lex.Get_Token) =
                       Lex.Token'Pos (Lex.Close_Bracket) then
                        Bloc_Class.Close;
                        Lex.Next_Token;
                    else
                        raise Error_Broadcaster.Brackect_Is_Missing;
                    end if;
                end if;

            end if;
        end if;
        Error := Failed;

    end Parse;

    procedure Unparse (N : in out Node) is
    begin
        case N.Rule is
            when 0 =>
                null;
            when 1 =>
                Text_Io.Put ("{");
                Arguments.Unparse (N.Arg);
                Statements.Unparse (N.State);
                Text_Io.Put_Line ("}");
        end case;
    end Unparse;

    function Is_First (T : Lex.Token) return Boolean is
    begin
        return (Lex.Token'Pos (T) = Lex.Token'Pos (Lex.Open_Bracket));
    end Is_First;
    procedure Interpret (N : Node;
                         The_Argument : in out Object.Parameters.List;
                         Result : in out Object.Reference) is

    begin

        case N.Rule is
            when 0 =>
                Result := Statements.Interpret (N.State, Result);
            when 1 =>
                Arguments.Set (N.Arg, The_Argument);
                Result := Statements.Interpret (N.State, Result);
        end case;

    end Interpret;  
    function Interpret (N : Node; The_Argument : Object.Message)
                       return Object.Reference is

    begin

        if String_Utilities.Equal
              ("valeur", Bounded_String.Image (The_Argument), True) then
            return (Statements.Interpret (N.State));
        else
            raise Error_Broadcaster.Unknown_Unary_Message;
        end if;
    end Interpret;
end Bloc;