RE: using flex for source-hilighting

[Valkanas Nikos]

Hi,

Being one of the performance die-hards, I feel obliged to offer a solution.

It is rather straightforward to implement it yourself through lex. Declare a 
global integer, floc, and increment in every production by +=yylen (Take care 
if you are using yyless() to increment only by yyless). You can then return 
this number at the beginning of a token  (before adding yylen) and after 
(assumming you match exactly a token). The advantage is that you can easily 
manipulate it to get exactly what you need (minus parens or white space for 
example). You could also define it with YY_USER_ACTION but I wouldn't recommend 
it if you are using yyless or other similar functions that back up the stream.

Cheers,
Nikos Balkanas

> -----Original Message-----
> From: Janus N." Tondering [mailto:address@hidden
> Sent: Sunday, June 09, 2002 6:31 PM
> To: address@hidden
> Subject: using flex for source-hilighting
> 
> 
> Dear Sirs,
> 
> I've written a flex program that spits out a HTML formatted version of
> input in c++. My problem now is that I want to use this lexer 
> to give me
> information about each keyword, string, number etc. found. I want the
> start and end file positions of the token matched.
> 
> Any hint on how I can do this? Or isn't flex capable of this?
> 
> Thank you.
> -- 
> Janus Nørgaard Tøndering      
> email: address@hidden or address@hidden
> 
> "Would you buy a car with the hood welded shut?"
> -Phil Hughes, Linux Journal Magazine
> 
> 
> 
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