mirror of
https://github.com/Mercury-Language/mercury.git
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785ec7d4b9
library/io.m:
library/prolog.m:
Move the definitions of see/seen/tell/told and their binary variants
from io.m to prolog.m, leaving behind forwarding predicates that are
marked obsolete.
library/robdd.m:
Replace tell/told with output to specified streams.
Where exported predicates sent output to the current output stream,
add a version that sends output to a user-specified stream.
This required replacing user-provided predicates that wrote a variable
to the current output stream with a user-provided function that simply
returns the string representation of the variable, so that the resulting
string could be printed to a *specified* stream.
NEWS:
Document the changes above.
compiler/mode_constraint_robdd.m:
compiler/mode_robdd.implications.m:
Conform to the changes above.
compiler/simplify_goal_call.m:
Warn about calls to see/seen/tell/told in prolog.m as well as io.m.
Warn about the binary versions of see/seen/tell told, and
the binary versions of set_{in,out}put_stream.
tests/warnings/save.{m,exp}:
Call prolog.see instead of io.see, since we want to test the warning
from simplify_goal_call.m, not the warning about io.see being obsolete.
126 lines
2.6 KiB
Mathematica
126 lines
2.6 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module save.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is cc_multi.
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:- implementation.
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:- import_module list.
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:- import_module int.
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:- import_module prolog.
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:- import_module string.
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main(!IO) :-
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( if
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data(Data),
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queen(Data, Out)
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then
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print_list(Out, !IO)
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else
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io.write_string("No solution\n", !IO)
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),
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prolog.see("save_file", SeeRes, !IO),
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(
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SeeRes = ok,
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io.read_file_as_string(ReadRes, !IO),
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(
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ReadRes = ok(FileContents),
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io.write_string(FileContents, !IO)
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;
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ReadRes = error(_PartialFileContents, ReadError),
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io.error_message(ReadError, ReadMsg),
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io.format("Read error: %s\n", [s(ReadMsg)], !IO)
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)
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;
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SeeRes = error(SeeError),
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io.error_message(SeeError, SeeMsg),
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io.write_string("See error: " ++ SeeMsg ++ "\n", !IO)
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).
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:- pred data(list(int)::out) is det.
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data([1, 2, 3, 4, 5]).
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:- pred queen(list(int)::in, list(int)::out) is nondet.
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queen(Data, Out) :-
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qperm(Data, Out),
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safe(Out).
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:- pred qperm(list(T)::in, list(T)::out) is nondet.
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qperm(L, K) :-
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(
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L = [],
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K = []
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;
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L = [_ | _], qdelete(U, L, Z),
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K = [U | V],
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qperm(Z, V)
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).
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:- pred qdelete(T::out, list(T)::in, list(T)::out) is nondet.
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qdelete(A, [A | L], L).
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qdelete(X, [A | Z], [A | R]) :-
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qdelete(X, Z, R).
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:- pred safe(list(int)::in) is semidet.
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safe([]).
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safe([N | L]) :-
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nodiag(N, 1, L),
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safe(L).
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:- pred nodiag(int::in, int::in, list(int)::in) is semidet.
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nodiag(B, D, L) :-
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(
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L = []
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;
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L = [N | T],
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NmB = N - B,
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BmN = B - N,
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( if D = NmB then
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fail
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else if D = BmN then
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fail
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else
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true
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),
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D1 = D + 1,
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nodiag(B, D1, T)
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).
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:- pred print_list(list(int)::in, io::di, io::uo) is det.
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print_list(Xs, !IO) :-
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(
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Xs = [],
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io.write_string("[]\n", !IO)
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;
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Xs = [_ | _],
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io.write_string("[", !IO),
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print_list_2(Xs, !IO),
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io.write_string("]\n", !IO)
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).
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:- pred print_list_2(list(int)::in, io::di, io::uo) is det.
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print_list_2([], !IO).
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print_list_2([X | Xs], !IO) :-
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io.write_int(X, !IO),
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(
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Xs = []
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;
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Xs = [_ | _],
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io.write_string(", ", !IO),
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print_list_2(Xs, !IO)
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).
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