Re: [Flex] Getting the absolute input file position

[Hans Aberg]

On 16 Jul 2005, at 19:56, address@hidden wrote:

> So as long as "every other rules", move the file offset properly,
> I'm in business.

The lexer reads a chunk from the file into its buffer, and then  
forgets about the file and its file position. So no rule moves the  
file offset at all; it is only changed when the buffer runs out of  
characters, and needs to be refilled.

> > In a lexer .c file with this option on, there is a segment right
> > before the lexer switch statement that looks something like:
>
> This seems more "acceptable".
>
> How does it manage unput and similar re-feed?

All stuff is handled via the lexer buffer, and no stuff is put back  
into the file.

> if ( yy_act != YY_END_OF_BUFFER && yy_rule_can_match_eol[yy_act] )
> {
>   yyfilepos += yyleng;
> }

You should have something like that.

  Hans Aberg