Re: PL_chars_to_term caracter encoding

On 03/15/2014 02:40 PM, Uwe Lesta wrote:
> Hello List,
>
> I'll try to feed SWI-Prolog (latest stabile release 6.6.2) with some Unicode chars.
>
> PL_chars_to_term() is the interesting part here. I'll try an utf8 encoding but I did not work.

No.  PL_chars_to_term() interprets its input as ISO-Latin-1.  Use 
PL_wchars_to_term().  The
current C++ wrapper makes sure all works well if you use wchar_t*.

Possibly the default should be to interpret char* using the default 
locale.  Old code
however assumed that all char* interfaces used octet encoding.  That 
code now still works,
but would break if we go for the locale.

	Cheers --- Jan


>
>
>       	PlCall("consult('d:/test.pl')");
> 	// save_term('eşek').
> 	// char str[19] = {'s','a','v','e','_','t','e','r','m','(',0x27, 0x65, 0xc5, 0x9f, 0x65,  0x6b, 0x27, ')', 0};
> 	// none('eşek').
> 	char str[14] = {'n','o','n','e','(',0x27, 0x65, 0xc5, 0x9f, 0x65,  0x6b, 0x27, ')', 0};
> 	// char str[8] = {0x27, 0x65, 0x65, 0x65, 0x65,  0x65, 0x27, 0};
> 	char * pStr = &str[0];
> 	bool b = PlCall(pStr);  // is false and should be true
> 	PlTerm t = PlCompound(pStr);	// an other test
> 	
> How can this be done?
>
> Any ideas are welcome.
>
>
> Prolog helper file test.pl
> --------------------------
> save_term_to_file(File, Term) :-
> 	setup_call_cleanup(open(File, write, Out, [encoding(utf8)]),
> 			   format(Out, '~q .~n', [Term]),
> 			   close(Out)).
>
> save_term(T):-
> 	save_term_to_file('d:\\test.out', T).
>
> 	% in Utf8 hex codes 65 c5 9f 65 6b
> none('eşek').
> --------------------------
>
> --
>
> Kind regards
>
> Uwe Lesta
>
>
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