|
DataMuseum.dkPresents historical artifacts from the history of: Rational R1000/400 Tapes |
This is an automatic "excavation" of a thematic subset of
See our Wiki for more about Rational R1000/400 Tapes Excavated with: AutoArchaeologist - Free & Open Source Software. |
top - downloadIndex: ┃ B T ┃
Length: 1926 (0x786)
Types: TextFile
Names: »B«
└─⟦2f6cfab89⟧ Bits:30000547 8mm tape, Rational 1000, !projects 94-01-04
└─ ⟦d65440be7⟧ »DATA«
└─⟦this⟧
with Value, Scanner, Objects;
package body Expression is
type Node_Structure is
record
Rule : Natural range 0 .. 1 := 0;
Valu : Value.Node := Value.Empty_Node;
end record;
procedure Parse (N : in out Node; Error : out Boolean) is
Failed : Boolean := False;
begin
N := new Node_Structure;
if Scanner.Symbol = Pour or else Value.Is_First (Scanner.Symbol) then
if not Scanner.Symbol = Pour then
N.Rule := 1;
Value.Parse (N.Valu, Failed);
else
Scanner.Next;
if Scanner.Symbol = Identifier then
Scanner.Next;
if Scanner.Symbol = Prendre then
Scanner.Next;
if Value.Is_First (Scanner.Symbol) then
Value.Parse (N.Valu, Failed);
else
Failed := True;
end if;
else
Failed := True;
end if;
else
Failed := True;
end if;
end if;
else
Failed := True;
end if;
Error := Failed;
end Parse;
function Is_First (T : Scanner.Token) return Boolean is
use Scanner;
begin
return T = Pour or else Is_First (Value);
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 := Inherited;
when 1 =>
Result := Statements.Interpret (N.Stat);
end case;
return Result;
end Interpret;
end Expression;