Re: column position in flex

[David Z Maze <dmaze@debian.org>]

Attila Csosz <csosz77@axelero.hu> writes:
> How can I get the column position using flex? (for better error handling)

I don't see any obvious way to, which seems a little surprising.  You
might try redefining the YY_USER_ACTION macro, though (see
(flex)Miscellaneous in the Info docs):

%{
int line = 0;
int frcol = 0;
int tocol = 0;
#define YY_USER_ACTION { frcol = tocol; tocol += yyleng; }
%}

%%

\n      line++; frcol = tocol = 0;

(%option yylineno will keep track of the line number for you, see
(flex)Options, but there's not an equivalent column number option that
I see.  Since you need a rule for \n anyways, you might as well track
the line number by hand.)

-- 
David Maze         dmaze@debian.org      http://people.debian.org/~dmaze/
"Theoretical politics is interesting.  Politicking should be illegal."
	-- Abra Mitchell