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4413ebe829
Estimated hours taken: 0.25 tests/hard_coded/bidirectional.m: tests/hard_coded/cycles.m: Add `import_module char', needed for type `char'. (Previously, before Simon's changes to implement `:- use_module', the compiler incorrectly allowed these illegal programs, because types were imported transitively. That bug is not completely fixed, but now such types are only imported as if by `:- use_module' rather than `:- import_module', so the compiler now catches such errors if the type name is not explicitly module-qualified.)
73 lines
1.6 KiB
Mathematica
73 lines
1.6 KiB
Mathematica
% Regression test.
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% Tests predicates with multiple modes,
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% reordering, and partially instantiated data structures.
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:- module bidirectional.
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:- interface.
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:- import_module io.
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:- pred main(io__state::di, io__state::uo) is det.
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:- implementation.
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:- import_module string, std_util, list, char.
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main -->
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format_list_of_int(read, List),
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format_list_of_int(write, List).
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:- type rw ---> read ; write.
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:- mode read :: in(bound(read)).
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:- mode write :: in(bound(write)).
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:- pred format_list_of_int(rw, list(int), io__state, io__state).
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:- mode format_list_of_int(write, in, di, uo) is det.
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:- mode format_list_of_int(read, out, di, uo) is det.
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format_list_of_int(RW, List) -->
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format_int(RW, Val),
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( { Val = no, List = [] }
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; { Val = yes(X), List = [X|_] }
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),
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( { List = [] }
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; { List = [_|_] },
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format_list_of_int(RW, Xs),
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{ List = [_|Xs] }
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).
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:- pred format_int(rw, maybe(int), io__state, io__state).
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:- mode format_int(write, in, di, uo) is det.
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:- mode format_int(read, out, di, uo) is det.
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format_int(read, Val) -->
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my_read_line(MaybeLine),
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{ if MaybeLine = ok(Chars),
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string__from_char_list(Chars, Line),
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string__to_int(Line, X)
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then
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Val = yes(X)
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else
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Val = no
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}.
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format_int(write, yes(X)) -->
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io__write_int(X),
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io__write_string("\n").
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format_int(write, no) -->
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io__write_string("\n").
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:- pred my_read_line(io__result(list(char)), io__state, io__state).
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:- mode my_read_line(out, di, uo) is det.
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my_read_line(Result) -->
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io__read_line(Result0),
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{
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Result0 = ok(Line0),
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list__reverse(Line0, ['\n'|LineRev])
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->
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list__reverse(LineRev, Line),
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Result = ok(Line)
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;
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Result = Result0
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}.
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