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9b25e167e1
library/string.m:
Define string.to_char_list and string.to_rev_char_list to either
replace code units in ill-formed sequences with U+FFFD or return
unpaired surrogate code points.
Use Mercury version of do_to_char_list instead of updating
the foreign language implementations.
tests/hard_coded/Mmakefile:
tests/hard_coded/string_char_list_ilseq.exp:
tests/hard_coded/string_char_list_ilseq.exp2:
tests/hard_coded/string_char_list_ilseq.m:
Add test case.
51 lines
1.5 KiB
Mathematica
51 lines
1.5 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_char_list_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 = "abc" ++ S0 ++ S1 ++ "xyz",
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string.to_char_list(S, CharList),
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io.write_string("string.to_char_list\n[", !IO),
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io.write_list(CharList, ", ", write_char_or_hex, !IO),
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io.write_string("]\n\n", !IO),
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string.to_rev_char_list(S, RevCharList),
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io.write_string("string.to_rev_char_list\n[", !IO),
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io.write_list(RevCharList, ", ", write_char_or_hex, !IO),
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io.write_string("]\n", !IO).
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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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