CODEWITHSUNDEEP
splitprologdcg
Gamsh
Gamsh

Reputation: 545

split string with matching list in prolog

I want split string into sub string using dcg list.
here my code
any(S, K) --> {member(S,K)}, S.
pre(S) --> any(S, ["di","tri","tetre"]).
split([]) --> "".
split([X|Xs]) --> pre(X), split(Xs).

?- phrase(split(Ls), "tridi").
Ls = [[t, r, i], [d, i]]

Here some error.it is split as letters,expected answer is
?- phrase(split(Ls), "tridi").
Ls = [tri,di].
Any Idea for this problem?

Upvotes: 1

Views: 287

Answers (1)

CapelliC
CapelliC

Reputation: 60004

for SWI-Prolog v.7, you need to change your code like

any(A,K) --> {member(S,K)}, S, {atom_codes(A, S)}.
pre(S) --> any(S, [`di`,`tri`,`tetre`]).
split([])     --> "".
split([X|Xs]) --> pre(X), split(Xs).

and then

?- phrase(split(Ls), `tridi`).
Ls = [tri, di]

Note I added a conversion to any//1. The rationale of string representation is documented here.

With your original code and query:

?- set_prolog_flag(double_quotes, codes).
true.

?- phrase(split(Ls), "tridi").
Ls = [tri, di]

Upvotes: 1

Related Questions