Question

I am new to prolog.

I need to convert the prolog input which is a given variable in the format of coma separated values inside open and close brace (a,z,b) to a prolog list of the form [a,z,b] .

Can some one please help?

Answer 1

The main functor of a sequence is ,/2, of a list is ./2. Hence,

% call: convert(+Sequence,-List)
convert(','(A,B), [A|B1]) :- !, convert(B,B1).
convert(A,[A]).

I assume that elements of the sequence should not be converted:

?- convert((1,2,3),L).
L = [1, 2, 3].

?- convert((1,(2,3),4),L).
L = [1, (2, 3), 4].