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DataMuseum.dkPresents historical artifacts from the history of: Rational R1000/400 |
This is an automatic "excavation" of a thematic subset of
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Length: 6144 (0x1800)
Types: Ada Source
Notes: 03_class, FILE, R1k_Segment, e3_tag, package body Expression, seg_0364d5
└─⟦8527c1e9b⟧ Bits:30000544 8mm tape, Rational 1000, Arrival backup of disks in PAM's R1000
└─⟦5a81ac88f⟧ »Space Info Vol 1«
└─⟦this⟧
with Bounded_String;
with Error_Broadcaster;
with Lex;
with Object;
with Value;
with Bloc_Class;
with Text_Io;
package body Expression is
type Node_Structure is
record
Rule : Natural range 0 .. 1 := 0;
Val : Value.Node := Value.Empty_Node;
Ident : Object.Message;
end record;
procedure Parse (N : in out Node; Error : out Boolean) is
Failed : Boolean := False;
Ident_Error : Object.Message;
begin
N := new Node_Structure;
Bounded_String.Copy (Ident_Error, Lex.Get_Value);
if Value.Is_First (Lex.Get_Token) then
N.Rule := 0;
Value.Parse (N.Val, Failed);
else
case Lex.Get_Token is
when Lex.Pour =>
N.Rule := 1;
Lex.Next_Token;
case Lex.Get_Token is
when Lex.Identifier =>
Bounded_String.Copy (N.Ident, Lex.Get_Value);
Bloc_Class.Put (N.Ident);
Lex.Next_Token;
case Lex.Get_Token is
when Lex.Prendre =>
Lex.Next_Token;
if Value.Is_First (Lex.Get_Token) then
Value.Parse (N.Val, Failed);
else
raise Error_Broadcaster.
Unexpected_Token;
end if;
when others =>
raise Error_Broadcaster.Prendre_Is_Missing;
end case;
when others =>
Failed := True;
raise Error_Broadcaster.Identifier_Is_Missing;
end case;
when others =>
Failed := True;
Error_Broadcaster.Unexpectedtoken (Lex.Get_Line);
raise Error_Broadcaster.Expression_Is_Missing;
end case;
end if;
Error := Failed;
exception
when Error_Broadcaster.Pour_Is_Missing =>
Error_Broadcaster.Pour_Missing (Lex.Get_Line);
N.Rule := 1;
Bounded_String.Copy (N.Ident, Ident_Error);
Bloc_Class.Put (N.Ident);
Lex.Next_Token;
Value.Parse (N.Val, Failed);
Error := Failed;
when Error_Broadcaster.Prendre_Is_Missing =>
Error_Broadcaster.Prendre_Missing (Lex.Get_Line);
Value.Parse (N.Val, Failed);
Error := Failed;
end Parse;
function Is_First (T : Lex.Token) return Boolean is
use Lex;
begin
return T = Lex.Pour or else Value.Is_First (T);
end Is_First;
function Interpret (N : Node;
Inherited : Object.Reference := Object.Void_Reference)
return Object.Reference is
Result : Object.Reference;
begin
case N.Rule is
when 0 =>
Result := Value.Interpret (N.Val);
when 1 =>
Result := Value.Interpret (N.Val);
Bloc_Class.Set (N.Ident, Result);
end case;
return Result;
end Interpret;
end Expression;
nblk1=5
nid=4
hdr6=8
[0x00] rec0=21 rec1=00 rec2=01 rec3=030
[0x01] rec0=11 rec1=00 rec2=05 rec3=084
[0x02] rec0=24 rec1=00 rec2=03 rec3=012
[0x03] rec0=15 rec1=00 rec2=02 rec3=000
[0x04] rec0=10 rec1=00 rec2=03 rec3=000
tail 0x2152fb64084de6b921b31 0x42a00088462060003
Free Block Chain:
0x4: 0000 00 00 02 89 80 0b 20 20 20 75 73 65 20 4c 65 78 ┆ use Lex┆