------------------------------------------------------------------------------
-- Copyright (c) 2014, Natacha Porté --
-- --
-- Permission to use, copy, modify, and distribute this software for any --
-- purpose with or without fee is hereby granted, provided that the above --
-- copyright notice and this permission notice appear in all copies. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES --
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF --
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR --
-- ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES --
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN --
-- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF --
-- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. --
------------------------------------------------------------------------------
procedure Natools.S_Expressions.Interpreter_Loop
(Expression : in out Natools.S_Expressions.Lockable.Descriptor'Class;
State : in out Shared_State;
Context : in Shared_Context)
is
Event : Events.Event := Expression.Current_Event;
Lock : Lockable.Lock_State;
begin
loop
case Event is
when Events.Add_Atom =>
Dispatch_Without_Argument
(State, Context, Expression.Current_Atom);
when Events.Open_List =>
Expression.Lock (Lock);
begin
Expression.Next (Event);
if Event = Events.Add_Atom then
declare
Name : constant Atom := Expression.Current_Atom;
begin
Expression.Next;
Dispatch_With_Arguments
(State, Context, Name, Expression);
end;
end if;
exception
when others =>
Expression.Unlock (Lock, False);
raise;
end;
Expression.Unlock (Lock);
Event := Expression.Current_Event;
exit when Event = Events.Error or Event = Events.End_Of_Input;
when Events.Close_List | Events.End_Of_Input | Events.Error =>
exit;
end case;
Expression.Next (Event);
end loop;
end Natools.S_Expressions.Interpreter_Loop;