ch08.019_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 8 of "Perl Best Practices"    ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;

my $sales_data = \*DATA;
my @sales;

sub translate_ID {
    my ($id) = @_;
    return $id;
}

# Specify order and lengths of fields...
Readonly my $RECORD_LAYOUT => 'A6 A10 A8';  # 6 ASCII, then 10 ASCII, then 8 ASCII

 

# Grab each line/record...
while (my $record = <$sales_data>) {
 
    # Extract all fields...
    my ($ident, $sales, $price) 
        = unpack $RECORD_LAYOUT, $record;
 
    # Append each record, translating ID codes and
    # normalizing sales (which are stored in 1000s)...
    push @sales, {
        ident => translate_ID($ident),
        sales => $sales * 1000,
        price => $price,
    };
}


use Data::Dumper 'Dumper';
warn Dumper [ @sales ];


__DATA__
X123-S000001324700000199
SFG-AT000000010200009099
Y811-Q000010030000000033