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NKH / Spreadsheet-Perl-0.12 / Perl / Reference.pm 

            

              
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package Spreadsheet::Perl ;
use 5.006 ;
use Carp ;
use strict ;
use warnings ;
require Exporter ;
our @ISA = qw(Exporter) ;
our %EXPORT_TAGS = 
        (
        'all' => [ qw() ]
        ) ;
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } ) ;
our @EXPORT ;
push @EXPORT, qw( Ref ) ;
our $VERSION = '0.02' ;
#-------------------------------------------------------------------------------
sub Ref
{
my $self = shift ;
if(defined $self && __PACKAGE__ eq ref $self)
        {
        my $information = shift ;
        confess "First argument to 'Ref' should be a description" unless '' eq ref $information ;
        my %references = @_ ;
         
        my %address_to_reference ;
        my $spreadsheet_reference_sub = bless 
                                                [
                                                  $information
                                                  
                                                , sub # store sub
                                                   {
                                                   ${$address_to_reference{$_[1]}} = $_[2] ;
                                                   }
                                                   
                                                , sub # fetch sub 
                                                   {
                                                   ${$address_to_reference{$_[1]}}
                                                   }
                                                ], "Spreadsheet::Perl::Reference" ;
                                                 
        while(my ($address, $reference) = each %references)
                {
                for my $current_address ($self->GetAddressList($address))
                        {
                        $address_to_reference{$current_address} = $reference ;
                        $self->Set($current_address, $spreadsheet_reference_sub) ;
                        }
                }
        }
else    
        {
        my $information = $self ;
        confess "First argument to 'Ref' should be a description" unless '' eq ref $information ;
        my $reference = shift ;
         
        confess "Error: 'Ref' takes a  reference as argument" unless(defined $reference) ;
         
        for(ref $reference)
                {
                'SCALAR' eq $_ && do
                        {
                        return bless 
                                [
                                  $information
                                , sub{$$reference = $_[2] ;} # store sub
                                , sub{$$reference} # fetch sub
                                ], "Spreadsheet::Perl::Reference" ;
                        } ;
                         
                confess "Error: 'Ref' doesn't know how to handle reference of type '$_'" ;
                }
        }
}
#-------------------------------------------------------------------------------
sub get_reference_description
{
my ($self, $address) = @_ ;
my @information ;
for my $current_address ($self->GetAddressList($address))
        {
        if(exists $self->{CELLS}{$current_address})
                {
                if(exists $self->{CELLS}{$current_address}{REF_SUB_INFO})
                        {
                        push @information,
                                $self->{CELLS}{$current_address}{REF_SUB_INFO} || '' ;
                        }
                }
        else
                {
                push @information, '' ;
                }
        }
return @information ;
}
*REF_INFO = \&get_reference_description ;
#-------------------------------------------------------------------------------
1 ;
__END__
=head1 NAME
Spreadsheet::Perl::Reference - Reference access for Spreadsheet::Perl
=head1 SYNOPSIS
  my $variable = 25 ;
  $ss{A1} = Ref(\$struct->{something}) ;
  $ss{A2} = PerlFormula('$ss{A1}') ;
   
  print "$ss{A1} $ss{A2}\n" ;
   
  $ss{A1} = 52 ;
   
  print "\$variable = $variable\n" ;
   
=head1 DESCRIPTION
Part of Spreadsheet::Perl. See "Scalar reference mapping" in main documentation
=head1 AUTHOR
Khemir Nadim ibn Hamouda. <nadim@khemir.net>
  Copyright (c) 2004 Nadim Ibn Hamouda el Khemir. All rights
  reserved.  This program is free software; you can redis-
  tribute it and/or modify it under the same terms as Perl
  itself.
   
If you find any value in this module, mail me!  All hints, tips, flames and wishes
are welcome at <nadim@khemir.net>.
=cut