28 lines
1.0 KiB
Prolog
28 lines
1.0 KiB
Prolog
:- use_module(library(pio)).
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:- use_module(library(dcg/basics)).
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:- initialization(main, main).
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main([FileName|_]) :-
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input(FileName, Moves),
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area(Moves, Area),
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write(Area), nl.
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area(Moves, Area) :-
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area(Moves, 0, A1), MainArea is abs(A1),
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convlist([r-N, N]>>(true), Moves, Horzs), sum_list(Horzs, Horz),
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convlist([u-N, N]>>(true), Moves, Verts), sum_list(Verts, Vert),
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Area is MainArea + Horz + Vert + 1.
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area([], _, 0).
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area([u-Len|Moves], H, Area) :- NewH is H + Len, area(Moves, NewH, Area).
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area([d-Len|Moves], H, Area) :- NewH is H - Len, area(Moves, NewH, Area).
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area([r-Len|Moves], H, Area) :- area(Moves, H, Area2), Area is Area2 + H*Len.
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area([l-Len|Moves], H, Area) :- area(Moves, H, Area2), Area is Area2 - H*Len.
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input(FileName, Moves) :- phrase_from_file(moves(Moves), FileName).
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moves([]) --> eos, !.
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moves([Move|Moves]) --> move(Move), moves(Moves).
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move(DirAtom-Len) -->
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alpha_to_lower(Dir), " ", number(Len), " (#", xdigits(_Color), ")", ("\n"; eos),
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{char_code(DirAtom, Dir)}.
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