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https://github.com/Mercury-Language/mercury.git
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47d0f70ea4
library/string.m:
Make string.index/3 and string.unsafe_index/3
return either U+FFFD or an unpaired surrogate code point
when an ill-formed code unit sequence is detected.
tests/hard_coded/Mmakefile:
tests/hard_coded/string_index_ilseq.exp:
tests/hard_coded/string_index_ilseq.exp2:
tests/hard_coded/string_index_ilseq.m:
Add test case.
43 lines
1.2 KiB
Mathematica
43 lines
1.2 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_index_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 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, 1),
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S = S0 ++ S1 ++ S0,
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list.foldl(test_index(S), 0 .. count_code_units(S), !IO).
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:- pred test_index(string::in, int::in, io::di, io::uo) is det.
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test_index(S, Index, !IO) :-
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( if string.index(S, Index, Char) then
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io.format("string.index(S, %d, %#x)\n",
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[i(Index), i(char.to_int(Char))], !IO)
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else
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io.format("string.index(S, %d, _) failed\n",
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[i(Index)], !IO)
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).
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