[Flex-help] How do you get FlexLexer.h to output?

[Arthur S. <asc...@at...>]

The header file for the C++ class is not generated. I don't know why and I've run out of imagination to try more guesses. Does anyone know what I'm doing wrong?

In a similar vein, %option prefix works as advertised for C generated scanners but for C++ generated scanners most yy<variables>, yy<methods> retain their yy prefix. Probably because they are internal to the scanner?

%option yyclass doesn't seem to do anything. All class scopes seem to be 'yyFlexLexer::'. Have I misunderstood what the %option does?

I've tried to run the example by Timo Bingmann on generating a simple C++ scanner for a calculator. "flex scanner.ll" generates the file "lex.Examples.cc" but not the header file(s).

My flex options are given below (some taken from Timo Bingman's scanner example.

thanks
art


%option noyywrap
%option prefix="Slip"
/* %option c++ */
%option prefix="Slip"

/* the manual says "somewhat more optimized" */
%option batch

%option nounistd
%option yyclass="SlipFlex" 
        

/* --header-file generates a C header file                    */
/* --noline is used because %option noline generates an error */

/* flex --header-file="SlipLex.h" --noline Slip.lex           */