lex|flex rule action ignored

Question

All,

I have a specified type of pattern in my lex file:

 "#"[ \\t]*"ifdef".*                { action_ifdef_manager(yytext);}

if a text like this encoutred #ifdef GLOBALVAR the action action_ifdef_manager is not called

Thanks for any Help.

Answer 1

The only problem is ambiguity of patterns. You should have a similar pattern like '#ifdef'

          a        |
          ab       |
          abc      |
          abcd     ECHO; REJECT;

The lexer here returns in "abcd" stream all four validated patterns a , ab , abc, abcd

Take a look at the Flex manual