in reply to Re^3: package vs module?
in thread package vs module?
...Mea Culpa, Mea Culpa, Mea Maxima Culpa!. :-)
I quite liked you description :)
So here is the
zentara package/module tutorial
a package (ZenTara) is inlined with the main source code
zen-pack.pl
#!/usr/bin/perl -- use strict; use warnings; ZenTara::hello(); ZenTara::goodbye(); exit( 0 ); package ZenTara; sub hello { print "\nHello\n"; } sub ZenTara::goodbye { print "\nGoodbye\n" }
a module is when you put the package into a separate file
ZenTara.pm , save in current directory or in ... site/lib/ZenTara.pm
package ZenTara; use strict; use warnings; sub hello { print "\nHello\n"; } sub ZenTara::goodbye { print "\nGoodbye\n" } 1; ## return true
zen-mod.pl is the perl program that does not inline but instead uses ZenTara
#!/usr/bin/perl -- use strict; use warnings; use ZenTara; ZenTara::hello(); ZenTara::goodbye(); exit( 0 );
less typing by importing functions from ZenTaraE; also making objects
zen-mod-exp.pl imports hello/goodbye from ZenTaraE, also creates an object
#!/usr/bin/perl -- use strict; use warnings; use ZenTaraE; hello(); ZenTaraE->new( name => "Bob" )->goodbye(); exit( 0 );
ZenTaraE.pm uses Exporter to export hello/goodbye by default, and has object constructor "new"
package ZenTaraE; use strict; use warnings; require Exporter; our @ISA = qw/ Exporter /; our @EXPORT = qw/ hello goodbye /; # exported by default sub new { my $class = shift; return bless { @_ }, $class; } sub hello { print "\nHello\n"; } sub goodbye { my( $self ) = @_; my $name = eval { $self->{name} } || ''; print "\nGoodbye $name\n" } 1; ## return true
rip modules apart and insert them directly into your script
zen-mod-exp-inlined.pl inlining comes first before main program with %INC trick to make ZenTaraEI useable
#!/usr/bin/perl -- BEGIN { $INC{'ZenTaraEI.pm'} = __FILE__; package ZenTaraEI; use strict; use warnings; require Exporter; our @ISA = qw/ Exporter /; our @EXPORT = qw/ hello goodbye /; # exported by default sub new { my $class = shift; return bless { @_ }, $class; } sub hello { print "\nHello\n"; } sub goodbye { my( $self ) = @_; my $name = eval { $self->{name} } || ''; print "\nGoodbye $name\n" } 1; ## return true }########## use strict; use warnings; use ZenTaraEI; hello(); ZenTaraEI->new( name => "Bob" )->goodbye(); exit( 0 ); exit( 0 );
See how they run
$ perl zen-pack.pl Hello Goodbye $ perl zen-mod.pl Hello Goodbye $ perl zen-mod-exp.pl Hello Goodbye Bob $ perl zen-mod-exp-inlined.pl Hello Goodbye Bob $
For more info see Simple Module Tutorial and perlmod
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Re^5: package vs module? (zentara package/module tutorial)
by zentara (Archbishop) on Mar 27, 2014 at 14:17 UTC |
In Section
Seekers of Perl Wisdom