My question is similar to this one.

I have a file, in which I am trying to check syntax, 6 lines at a time. The file will vary in length and may contain comments and/or empty lines.

I'm using Text::Template (thanks to a few of you) to create a template of what each 6-line block should look like: 

{$map} {$proto}://{$uri1} {$proto}://{$uri2} 
{$map} {$proto}://{$uri1} {$proto}://{$uri2}
{$map} {$proto}://{$uri1} {$proto}://{$uri2}
{$map} {$proto}://{$uri1} {$proto}://{$uri2}
{$map} {$proto}://{$uri2} {$proto}://{$uri1}
{$map} {$proto}://{$uri2} {$proto}://{$uri1}

[download]

Here's some sample data that I am working with: 

map http://chat.yahoo.com http://origin-chat.yahoo.com
map tunnel://chat.yahoo.com tunnel://origin-chat.yahoo.com
map http://10.0.2.7 http://origin-chat.yahoo.com
map tunnel://10.0.2.7 tunnel://origin-chat.yahoo.com
reverse_map http://origin-chat.yahoo.com http://chat.yahoo.com
reverse_map tunnel://origin-chat.yahoo.com tunnel://chat.yahoo.com
map http://shop.yahoo.com http://origin-shop.yahoo.com
map tunnel://shop.yahoo.com tunnel://origin-shop.yahoo.com
map http://10.0.2.8 http://origin-shop.yahoo.com
map tunnel://10.0.2.8 tunnel://origin-shop.yahoo.com
reverse_map http://origin-shop.yahoo.com http://shop.yahoo.com
reverse_map tunnel://origin-shop.yahoo.com tunnel://shop.yahoo.com

[download]

Here's the program, thus far: 

#!/usr/bin/perl -w

use strict;
use Text::Template;

my %vars;
my $lines;
my @lines;
my $file = "/home/trixee/remap.config";

my $template = new Text::Template (TYPE => 'FILE' , SOURCE => $file)
  or die "Couldn't construct template: $Text::Template::ERROR";

open FH, "$file" or die "$!\n";

while ($lines = <FH>)
  {
    chomp $lines;
    next if ($lines =~ /^\#/);
    
 if ($lines=~/(\d+)(\s+)(map|reverse_map)(\s+)(\w+)\:\/\/(.*?)(\s+)(\5
+)\:\/\/(.*?)$/)  
{      
      $vars{'d'}     = $1; 
      $vars{'map'}   = $3;
      $vars{'proto'} = $5;
      $vars{'uri1'}  = $6;
      $vars{'uri2'}  = $8;      
    }
  }

my $result = $template->fill_in(HASH => \%vars);           

if (defined $result) 
  { 
    print $result 
  }
else 
  { 
    die "Couldn't fill in template: $Text::Template::ERROR" }

[download]

Using the example data above, I would need to modify the existing code to read lines 1-6 and populate the template. Then, I would add logic to compare the populated template with lines 1-6 of the data file. If they are equal, then read in lines 7-12, and repeat the comparison logic.

Any ideas? Am I appoaching this efficiently?

In reply to Reading in N lines at a time by Tuna

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