Re: [Flex-help] handling EOF with flex

[John G. <jgw...@da...>]

Can you just do a 'getline' type thing, take the string, and pass it in
as a string buffer to the Lexer?  Then you don't have to mess around
with yywrap.  It also makes the lexing a bit more atomic.

           == John ==
 
> -----Original Message-----
> From: fle...@li... [mailto:flex-help-
> bo...@li...] On Behalf Of Martin Weise
> Sent: Monday, March 31, 2008 10:36 AM
> To: fle...@li...
> Subject: [Flex-help] handling EOF with flex
> 
> Hi @all
> 
> I guess my question is posted several times, but I did not find a
> solution that works for me.
> I want to do the following thing:
> The user can enter a command: load 'ex.wip'
> After pressing ENTER, this line is lexed through flex and loads the
file,
> which then is processed via flex.
> 
> This is done by:
>     FILE *file = freopen(name.c_str(), "r", yyin);
> 
> I encounter problems when trying to catch the EOF, as
> I want to return to the prompt, means the stdin.
> 
> As far as I have read, I must overwrite yywrap.
> I did this:
>      int yywrap()
>     {
>         yyrestart(stdin);
>         return 0;
>     }
> 
> For debuging reasons I placed a cout in my local function, but as
there
> is
> no cout, it seems that the yywrap function is never called.
> 
> I also tried this:
>     <<EOF>>    { BEGIN(0); yyin = stdin; cout <<"teset";  return
> yytext[0]; }
> 
> in my flex file. But the result is also no output.
> 
> So how do I handle an EOF, and return to the prompt ?
> 
> 
> 
> Regards
>  Martin Weise
> 
>
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