Re: [Flex-help] match lines starting with "include" and others

[Chris v. <che...@gm...>]

Maybe you could exploit the property that your interesting matches start
with "^#"?

  /* match "#include" lines */
^"#"[ \t]*include[ \t]*[<\"]  {printf("begin IFILE\n");BEGIN IFILE;}

  /* match any "#" line that doesn't match the above */
^#  { printf("#"); BEGIN(NON_INCLUDE); }
<NON_INCLUDE>.+  { printf("%s", yytext); }
<NON_INCLUDE>\n  { printf("\n"); BEGIN(INITIAL); }

  /* match the remaining non-"#" lines */
^[^#].*  { printf("%s", yytext); }
[\n]    { printf("\n"); }


-Chris



On Sat, Jan 9, 2010 at 10:33 AM, Michael Chen
<van...@gm...>wrote:

> I am trying to match with longer chunks, instead of one character by
> one character. Is there a way? Thanks.
>
> Michael Chen
>
> On Sat, Jan 9, 2010 at 12:02 PM, Marcel Laverdet <ma...@la...>
> wrote:
> >
> >
> > Whoaaa, there is a severe misunderstanding of the way flex files work
> > here. Flex will basically run through all your expressions and match the
> > longest one. You should keep that first rule, throw away all the others,
> > and then have another one that's like:
> >
> > .|\n printf("%c", *yytext);
> >
> > On Sat, 9 Jan 2010 09:20:03 -0600, Michael Chen
> > <van...@gm...> wrote:
> >> Dear there,
> >>
> >> I would like to process only the include statement lines, and simply
> >> print out the other lines. My solution to match other lines seems
> >> reasonable, but don't work. Would you give me a idea why? Thanks.
> >>
> >> Michael
> >>
> >> /*   To match lines start with: #include <; or #include ";   */
> >> ^"#"[ \t]*include[ \t]*[<\"]  {printf("begin IFILE\n");BEGIN IFILE;}
> >>
> >> /*  To math any other lines */
> >> ^[^"#"].*\n    {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"[^i].*\n     {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"i[^n].*\n     {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"in[^c].*\n     {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"inc[^l].*\n      {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"incl[^u].*\n     {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"inclu[^d].*\n      {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"includ[^e].*\n     {fprintf(yyout,"[%4d] %s", yylineno, yytext);}
> >> ^"#"include[ \t]*[^<\"].*\n     {fprintf(yyout,"[%4d] %s", yylineno,
> >> yytext);}
> >
>
>
>
> --
> Best regards,
> Michael Chen
> Google Voice Phone.: 847-448-0647
>
>
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