Re: TeX output for UML diagrams [path]

[Ruslan Shevchenko <ruslan shevchenko kiev ua>]

Cyrille Chepelov wrote:

> Le dim, jan 06, 2002, Ю 12:34:53 +0200, Ruslan Shevchenko a Иcrit:
>
> > 1. Small problem with printing UML diagram in TeX: TeX special symbols 
> > in names (such as #) are not escaped, as result TeX output
> > are not compiled by TeX.
> > So, I attach patch against dia-0.88.1
>
> thanks for the patch ! It looks mostly good; I've not yet applied it, see 
> comments/questions below. But as it applies cleanly to CVS head, I don't see
> why wouldn't it go in.

I will send to list corrected path tomorow, if current utf8 workarounds 
will be accepted. (see below)

> [ ... ]
>
>
>
> in all these loops, what happens if the input string is encoded in UTF-8 ? 
>
> (how does TeX behave when presented with UTF-8 data ? Can it even do that ?
> OK, I tease you, but I'd be very happy to learn how)

TeX itself - no.
omegaTeX (distributed with near all TeX distributions)
can handle utf16, will be handle utf8 and utf32 in near future.


So, ideal solution is:

- insert dialog form for TeX pstricks export parameters.
  (Can I do this from plugin ? If yes - how ?)
   where ask output TeX encoding.
- transform Utf8 to Utf16 for omegaTex or to some 8-bit
  encoding for normal TeX.
    \footnote{
       encoding of text is usially
       setted by \inputenc command in document preambule.
     }
  Extra questions:
  (what is the name of type for utf16 char and utf16 string ?
   are exists built-in in support libraries transform functions
   (utf8 -> utf16), or I
   can use code from unicode consorcium. ?
   are exists built-in in support libraries transform functions
   (utf8 -> encoding Name).
  )

  - in terms of 'soft-localization' code is Ok.
   (i. e. current code will work with utf8, but TeX will not be
able to interpet it correctly. )
So, I think current patch [ with TODO record ] will ok as
short-term solution (it does not make thing worse), then when we
will learn, how to do first approach, we will write extra code for
handling of different TeX input encodings.





> > + }
> > + /* now alloc memory and print prefixed escaped string */
> > + out_text = malloc(strlen(in_text)+extra_count+1);
>
> <nitpick>Please use gmalloc() here</nitpick>
>
>
> > + out_cursor=out_text;
> > + for(in_cursor=in_text;*in_cursor;) {
> > +   if (is_tex_escaped_symbol(*in_cursor,&prefix,&replace)) {
> > +     while(*prefix) *out_cursor++ = *prefix++;
> > +   }
> > +   if (!replace) {
> > +     *out_cursor++=*in_cursor++;
> > +   }else{
> > +     in_cursor++;
> > +   }
> > + }
> > + *out_cursor++='\0';
> > + return out_text;
> > +}
> > +
> > static void
> > draw_string(RendererPSTRICKS *renderer,
> >             const char *text,
> >             Point *pos, Alignment alignment,
> >             Color *color)
> > {
> > +    char* tex_escaped_text;
> > +
> >     set_line_color(renderer,color);
> >
> >     fprintf(renderer->file,"\\rput");
> > @@ -668,7 +746,12 @@
> >         fprintf(renderer->file,"[r]");
> >         break;
> >     }
> > -    fprintf(renderer->file,"(%f,%f){\\scalebox{1 -1}{%s}}\n",pos->x, pos->y,text);
> > +    
> > +    tex_escaped_text=create_tex_escaped_string(text); 
> > +
> > +    fprintf(renderer->file,"(%f,%f){\\scalebox{1 -1}{%s}}\n",pos->x, pos->y,tex_escaped_text);
> > +
> > +    free(tex_escaped_text);
>
> <nitpick>gfree()</nitpick>
>
>
> Thanks in advance !
>
>         -- Cyrille