mirror of
https://github.com/Mercury-Language/mercury.git
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73 lines
2.2 KiB
Mathematica
73 lines
2.2 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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%
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% The .exp file is for backends using UTF-8 string encoding.
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% The .exp2 file is for backends using UTF-16 string encoding.
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%
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%---------------------------------------------------------------------------%
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:- module string_code_point_offset_ilseq.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module char.
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:- import_module int.
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:- import_module list.
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:- import_module string.
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%---------------------------------------------------------------------------%
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main(!IO) :-
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S0 = "😀",
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S1 = string.between(S0, 0, count_code_units(S0) - 1),
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S = "a" ++ S0 ++ "b" ++ S1 ++ "z",
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io.write_string("start counting from offset 0\n", !IO),
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test_code_point_offset(S, 0, 0, !IO),
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io.nl(!IO),
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io.write_string("start counting from offset 1\n", !IO),
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test_code_point_offset(S, 1, 0, !IO),
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io.nl(!IO),
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io.write_string("start counting from offset 2\n", !IO),
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test_code_point_offset(S, 2, 0, !IO),
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io.nl(!IO).
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:- pred test_code_point_offset(string::in, int::in, int::in, io::di, io::uo)
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is det.
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test_code_point_offset(S, StartOffset, Count, !IO) :-
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( if string.code_point_offset(S, StartOffset, Count, Offset) then
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io.format("string.code_point_offset(S, %d, %d, %d); ",
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[i(StartOffset), i(Count), i(Offset)], !IO),
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( if string.index(S, Offset, Char) then
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io.write_string("Char = ", !IO),
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write_char_or_hex(Char, !IO),
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io.nl(!IO)
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else
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io.write_string("string.index/3 failed\n", !IO)
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),
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test_code_point_offset(S, StartOffset, Count + 1, !IO)
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else
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io.format("string.code_point_offset(S, %d, %d, _) failed\n",
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[i(StartOffset), i(Count)], !IO)
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).
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:- pred write_char_or_hex(char::in, io::di, io::uo) is det.
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write_char_or_hex(Char, !IO) :-
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( if Char = '\ufffd' ; char.is_surrogate(Char) then
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io.format("%#x", [i(char.to_int(Char))], !IO)
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else
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io.write_char(Char, !IO)
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).
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