Copyright (c) 2000 California Institute of Technology
All rights reserved. See the file COPYRIGHT for a full description.
$Id: PDATrans.i3.html,v 1.3 2010-04-29 17:18:52 wagner Exp $
INTERFACE PDATrans;
CONST
Brand = "PDATrans";
TYPE
ActKind = {Shift, Reduce, Error, Accept,
ShiftReduce, ShiftAccept, Jump};
Jump is introduced in the flatten step.
jumps are unconditional and have code = -2
T = RECORD
code: INTEGER; (* -1 means "set default", else a symbol code *)
kind: ActKind;
target: INTEGER; (* reduce rule number, or shift state number, or 0 *)
END;
PROCEDURE Compare(a, b: T): [-1..1];
PROCEDURE Equal(a, b: T): BOOLEAN;
PROCEDURE Hash(a: T): INTEGER;
PROCEDURE Format(a: T): TEXT;
PROCEDURE PreShift(a: T; code: INTEGER): T;
END PDATrans.