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Copyright (C) Olivetti 1989
All Rights reserved
Use and copy of this software and preparation of derivative works based
upon this software are permitted to any person, provided this same
copyright notice and the following Olivetti warranty disclaimer are
included in any copy of the software or any modification thereof or
derivative work therefrom made by any person.
This software is made available AS IS and Olivetti disclaims all
warranties with respect to this software, whether expressed or implied
under any law, including all implied warranties of merchantibility and
fitness for any purpose. In no event shall Olivetti be liable for any
damages whatsoever resulting from loss of use, data or profits or
otherwise arising out of or in connection with the use or performance
of this software.
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Copyright (C) 1993, Digital Equipment Corporation
All rights reserved.
See the file COPYRIGHT for a full description.
INTERFACE AST_DisplayRep;
IMPORT AST, AST_CopyRep;
Clients must not apply the display method directly, but use some
wrapper procedure provided by a given AST implementation.
New AST nodes should provide an implementation of the display method.
TYPE
NODE = AST_CopyRep.NODE OBJECT
METHODS
display(handle: Handle) RAISES ANY := Null;
(* An (opaque) handle object is passed to each node display method,
for use in communication with the display kernel and state holding. *)
END;
REVEAL AST.NODE <: NODE;
TYPE
Handle <: ROOT;
PROCEDURE Null(n: NODE; handle: Handle) RAISES {};
returns immediately; used as default method
END AST_DisplayRep.