Modul Xgrun

Jan Burse, erstellt 22. Mai 2019
* Prolog text xgrun from Chat80 as a module.
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* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
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* reproduce, change and translate the information.
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
* Obtained rights comment in Prolog text and text from LICENSE file:
* @(#) 24.1 2/23/88
* Copyright 1986, Fernando C.N. Pereira and David H.D. Warren,
* All Rights Reserved
* This program may be used, copied, altered or included in other programs
* only for academic purposes and provided that the authorship of the
* initial program is acknowledged. Use for commercial purposes without the
* previous written agreement of the authors is forbidden.
:- if(current_prolog_flag(dialect,jekejeke)).
:- package(library(natural)).
:- endif.
:- module(xgrun, [terminal/5,gap/1,(virtual)/3]).
% :- mode terminal(?,+,?,+,?),
% gap(+),
% virtual(+,+,?).
terminal(T, S, S, x(_,terminal,T,X), X).
terminal(T, [T|S], S, X, X) :-
virtual(NT, x(_,nonterminal,NT,X), X).