in reply to Re: Reading in N lines at a time
in thread Reading in N lines at a time

hmmm. Something is wrong that I can't figure out: 

#!/usr/bin/perl -w

use strict;
use Text::Template;


my %vars;
my $line;
my @fields;
my $result;

my $file = "/home/trixee/20010814/remap.tmpl";
my $cfg = "/home/trixee/20010814/remap.config";
my $template = new Text::Template (SOURCE => $file)
  or die "Couldn't construct template: $Text::Template::ERROR";

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

while ($line = <DATA>)
  {
    chomp $line;
    next if ($line =~ /^\#/);
        
    @fields = qw(map proto uri1 uri2);
    
    if ( @vars{@fields} = $line=~m!(map|reverse_map)\s+(\w+)://(.*?)\s
++\2://(.*?)$! )
      {      
 $result = $template->fill_in(HASH => \%vars);
      }
    
    if ($result) 
      {
print "$result\n";
      }
    else 
      { 
 die "Couldn't fill in template: $Text::Template::ERROR"
      }
 }      

__DATA__
# Automatic mapping tables generated from Magma
map http://www.digitalcity.com http://origin-www.digitalcity.com
map tunnel://www.digitalcity.com tunnel://origin-www.digitalcity.com
map http://10.0.2.1 http://origin-www.digitalcity.com
map tunnel://10.0.2.1 tunnel://origin-www.digitalcity.com
reverse_map http://origin-www.digitalcity.com http://www.digitalcity.c
+om
reverse_map tunnel://origin-www.digitalcity.com tunnel://www.digitalci
+ty.com

Template:

{$map} {$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]

prints 

map http://www.digitalcity.com http://origin-www.digitalcity.com
map http://www.digitalcity.com http://origin-www.digitalcity.com
map http://www.digitalcity.com http://origin-www.digitalcity.com
map http://www.digitalcity.com http://origin-www.digitalcity.com
map http://origin-www.digitalcity.com http://www.digitalcity.com
map http://origin-www.digitalcity.com http://www.digitalcity.com
map tunnel://www.digitalcity.com tunnel://origin-www.digitalcity.com
map tunnel://www.digitalcity.com tunnel://origin-www.digitalcity.com
map tunnel://www.digitalcity.com tunnel://origin-www.digitalcity.com
map tunnel://www.digitalcity.com tunnel://origin-www.digitalcity.com
map tunnel://origin-www.digitalcity.com tunnel://www.digitalcity.com
map tunnel://origin-www.digitalcity.com tunnel://www.digitalcity.com
map http://10.0.2.1 http://origin-www.digitalcity.com
map http://10.0.2.1 http://origin-www.digitalcity.com
map http://10.0.2.1 http://origin-www.digitalcity.com
map http://10.0.2.1 http://origin-www.digitalcity.com
map http://origin-www.digitalcity.com http://10.0.2.1
map http://origin-www.digitalcity.com http://10.0.2.1
map tunnel://10.0.2.1 tunnel://origin-www.digitalcity.com
map tunnel://10.0.2.1 tunnel://origin-www.digitalcity.com
map tunnel://10.0.2.1 tunnel://origin-www.digitalcity.com
map tunnel://10.0.2.1 tunnel://origin-www.digitalcity.com
map tunnel://origin-www.digitalcity.com tunnel://10.0.2.1
map tunnel://origin-www.digitalcity.com tunnel://10.0.2.1
reverse_map http://origin-www.digitalcity.com http://www.digitalcity.c
+om
reverse_map http://origin-www.digitalcity.com http://www.digitalcity.c
+om
reverse_map http://origin-www.digitalcity.com http://www.digitalcity.c
+om
reverse_map http://origin-www.digitalcity.com http://www.digitalcity.c
+om
reverse_map http://www.digitalcity.com http://origin-www.digitalcity.c
+om
reverse_map http://www.digitalcity.com http://origin-www.digitalcity.c
+om
reverse_map tunnel://origin-www.digitalcity.com tunnel://www.digitalci
+ty.com
reverse_map tunnel://origin-www.digitalcity.com tunnel://www.digitalci
+ty.com
reverse_map tunnel://origin-www.digitalcity.com tunnel://www.digitalci
+ty.com
reverse_map tunnel://origin-www.digitalcity.com tunnel://www.digitalci
+ty.com
reverse_map tunnel://www.digitalcity.com tunnel://origin-www.digitalci
+ty.com
reverse_map tunnel://www.digitalcity.com tunnel://origin-www.digitalci
+ty.com

[download]

Why?

Replies are listed 'Best First'.
Re: Re: Re: Reading in N lines at a time
by rchiav (Deacon) on Aug 15, 2001 at 19:24 UTC
    From your description you gave in the CB, you're looking for it to print 6 lines according to the layout of the template.

    It is doing that, bu not as I assume you wish. I'm not all that knowledgeable about Text::Template, but this is what I see happening. You're defining your fields.. 

        @fields = qw(map proto uri1 uri2);

    [download]
    ..then you are parsing and passing your data.. 
    
    if ( @vars{@fields} = $line=~m!(map|reverse_map)\s+(\w+)://(.*?)\s
++\2://(.*?)$! )
      {      
 $result = $template->fill_in(HASH => \%vars);
      }

    [download]
    ...and your template looks like this.. 
    {$map} {$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]
    Now, you read one(1) line, parsed it and passed it to fill in the template. For the first line, your values are going to look like this.. 
    $map => map 
$proto =>http
$uri1 => www.digitalcity.com 
$uri2 => origin-www.digitalcity.com

    [download]
    When you pass it to $template->fill_in(), it fills in the whole template. So on the line, the template is filled in completely (all six lines) and the results are the first 6 that are printed. Rinse, wash and repeat for the rest of the lines you're parsing.

    I assume that this isn't the effect that you want. But to fix it you're going to have to take a different approach. Namely, reading in 6 lines and using different variables on each line to designate which values go where.

    There might be a better way using Text::Template but I'm really not all that familiar with the module.

    Hope this helps..
    Rich

[reply]
[d/l]
[select]

In Section Seekers of Perl Wisdom