Example Palin3

Jan Burse, created Aug 15. 2016
/**
* Prolog code for the revisited DCG with attributes example.
*
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:- use_module(library(minimal/chart)).
:- use_module(library(experiment/ref)).
:- static palin/5.
palin([], [Middle]) ==>
[Middle].
palin([Middle], []) ==>
[Middle, Middle].
palin([Border|List], Middle) ==>
[Border],
palin(List, Middle),
[Border].
% ?- use_module(library(minimal/hypo)).
% ?- <= chart("bert", _), listing('D'/2).
% :- thread_local 'D'/2.
% 'D'(116, 3).
% 'D'(114, 2).
% 'D'(101, 1).
% 'D'(98, 0).
% ?- <= chart("racecar", N), chart(palin(X1,Y1), N).
% X1 = [114,97,99],
% Y1 = [101]
% ?- <= chart("bert", N), chart(palin(X1,Y1), N).
% No

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