aoc23/14/part1.pl

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:- use_module(library(pio)).
:- use_module(library(clpfd)).
:- initialization(main, main).
:- table rocks/3.
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main([FileName|_]) :-
input(FileName, Input),
transpose(Input, Rotated),
concurrent_maplist([Row, [#|Row]]>>(true), Rotated, Rocks),
/*concurrent_*/maplist(row_weight, Rocks, Weights),
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sum_list(Weights, W),
writef('%t\n', [W]).
row_weight(Row, Weight) :-
phrase(rocks(Rocks), Row),
convlist([N-'#', N]>>(true), Rocks, RockCounts),
sum_list(RockCounts, Weight),
writef('>> %t <-- %t\n', [Weight, Row]).
rocks([0-0]) --> eos.
rocks([LastN-I, LastN-LastI|Rocks]) -->
[0], rocks([LastN-LastI|Rocks]),
{I is LastI + 1}.
rocks([N-I, LastN-LastI|Rocks]) -->
[1], rocks([LastN-LastI|Rocks]),
{I is LastI + 1, N is LastN + 1}.
rocks([0-I, N-'#', LastN-LastI|Rocks]) -->
[#], rocks([LastN-LastI|Rocks]),
{I is LastI + 1, N is LastN*(2*LastI - LastN + 1) / 2}.
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% things below are for reading from input file
input(FileName, Input) :- phrase_from_file(lines(Input), FileName).
lines([]) --> eos, !.
lines([Line|Lines]) --> line(Line), lines(Lines).
line([]) --> "\n"; eos.
line([1|Chars]) --> "O", line(Chars).
line([0|Chars]) --> ".", line(Chars).
line(['#'|Chars]) --> "#", line(Chars).
eos([], []).