Hi Perl Monks,

I am using a range operator in matching #if(or)#ifdef(or)#ifndef to the corresponding #endif directive and remove the code in between them. If I have a nested #if directive my perl code doesn't work.

Here with I am posting a C code snippet 

{

 #if 1
  #define done 9
  #define do 10
  #ifdef
    #define def1 11
    #define thread 12
  #endif
  #define mutex 13
  #define inter 14 
 #endif
 #define intel 15
 #define intel_64 16
}

[download]
from the current perl code the output is like this 
{
    #define mutex 13
  #define inter 14 
 #endif
 #define intel 15
 #define intel_64 16
}

[download]
but actually my output has to be like this 
{
 #define intel 15
 #define intel_64 16
}

[download]
here is my perl code please help me out in tracking the nested #if using the range operator, 
my ($start, $stop) = (qr '#ifdef|#if|#ifndef|#else', qr '#endif');

open(file1,$file) or die "Error opening input: " . $!;
open(file2, ">$filea") or die "Error opening input: " . $!;

while (<file1>) {
   if (/$start/ .. /$stop/) {
    next;    
   }
   else
   {
     print file2 $_ ;
   }
}

[download]

Thanks a lot,

-Prassi

In reply to nested #if directive matching matching by prassi

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