RosettaCodeData/Task/Strip-comments-from-a-string/Prolog/strip-comments-from-a-string-1.pro

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Prolog
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2013-04-11 01:07:29 -07:00
stripcomment(A,B) :- stripcomment(A,B,a).
stripcomment([A|AL],[A|BL],a) :- \+ A=0';, \+ A=0'# , \+ A=10, \+ A=13 , stripcomment(AL,BL,a).
stripcomment([A|AL], BL ,a) :- ( A=0';; A=0'#), \+ A=10, \+ A=13 , stripcomment(AL,BL,b).
stripcomment([A|AL], BL ,b) :- \+ A=10, \+ A=13 , stripcomment(AL,BL,b).
stripcomment([A|AL],[A|BL],_M):- ( A=10; A=13), stripcomment(AL,BL,a).
stripcomment([],[],_M).
start :-
In = "apples, pears ; and bananas
apples, pears # and bananas",
stripcomment(In,Out),
format("~s~n",[Out]).