Example Palin2

Jan Burse, created Oct 25. 2018
/**
* Prolog code for the DCG with attributes example.
*
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:- use_module(library(standard/dcg)).
palin([], [Middle]) -->
[Middle].
palin([Middle], []) -->
[Middle,
Middle].
palin([Border|List], Middle) -->
[Border],
palin(List, Middle),
[Border].
% ?- phrase(palin(X1, Y1), "racecar").
% X1 = [114, 97, 99],
% Y1 = [101]
% ?- phrase(palin(X1, Y1), "anna").
% X1 = [97, 110],
% Y1 = []
% ?- phrase(palin(X1, Y1), "bert").
% No
% ?- phrase(palin("ra", "d"), X), atom_codes(A,X).
% X = [114,97,100,97,114],
% A = radar

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