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Perl Template Toolkit

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Template Toolkit 2: basic use, a success case, intro on plugin development

Template Toolkit 2: basic use, a success case, intro on plugin development

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  • 1. Perl Template Toolkit Stefano Rodighiero larsen@perl.it
  • 2. nothing_particular.pl #!/usr/bin/perl print quot;Content-type:text/htmlnnquot;; print quot;<html><head>quot;; print quot;<title>Print Environment</title></head>quot;; print quot;<body>”; foreach $key (sort(keys %ENV)) { print quot;$key = $ENV{$key}<br>nquot;; } print quot;</body></html>quot;;
  • 3. Template • Separano il codice applicativo dalla presentazione • Facilitano il riuso del codice • Ci sono n moduli su CPAN • Evidentemente è una buona idea :-)
  • 4. Template Toolkit • Dal sito statico... • ...al CGI... • ...all’applicazione Web
  • 5. ABC
  • 6. Un semplice esempio [% convenevoli %], per [% festa %] vorrei ricevere [% dove %] un po' di LEGO. Riporto i codici delle confezioni che preferisco: [% FOREACH item IN boxes %] * [% item %] [% END %] [% captatio %] Cordiali saluti, S.
  • 7. Un semplice esempio/2 my $tt = Template->new(); my $vars = { convenevoli => quot;Caro Babbo Natalequot; , festa => quot;Natalequot; , dove => quot;sotto l'alberoquot; , boxes => [ 7190, 897, 6880, 6990 ] , captatio => quot;Salutami le renne, eh? Ci tengo.quot; }; $tt->process( 'letterina.tt2', $vars ) or die $tt->error();
  • 8. Un semplice esempio/3 my $tt = Template->new(); my $vars = { convenevoli => quot;Cara Befanaquot; , festa => quot;l’Epifaniaquot; , dove => quot;nella calzaquot; , boxes => [ 7190, 897, 6880, 6990 ] , captatio => quot;Spero che la schiena vada meglio.quot; }; $tt->process( 'letterina.tt2', $vars ) or die $tt->error();
  • 9. Passare oggetti 1 package Product::DBI; 2 use base 'Class::DBI'; 3 Url::DBI->set_db( Main => 'dbi:mysql:products', 4 '*** LOGIN ***', '*** PASSWORD ***' ); 5 6 package Product; 7 use base 'Product::DBI'; 8 Url->table( 'product' ); 9 Url->columns( All => qw/id description type price/ ); 10 11 package main; 12 13 # ... 14 my $template = Template->new(); 15 my $iterator = Product->retrieve_all(); 16 17 $template->process('list.tt2', { iterator => $iterator }) 18 or die $template->error;
  • 10. Passare oggetti/2 [% IF iterator.count == 0 %] Nessun prodotto<br /> [% ELSE %] <table> [% WHILE (item = iterator.next) %] <tr> <td>[% item.id %]</td> <td>[% item.description %]</td> <td align=quot;rightquot;>[% item.price %]</td> </tr> [% END %] </table> [% END %]
  • 11. www.perl.it
  • 12. Requisiti • Facile rilocabilità • Riuso di elementi già sviluppati • Build locale • Pubblicazione in un solo passo • Riusabilità futura del codice sviluppato
  • 13. Soluzione • Template Toolkit • ttree • Una manciata di moduli di CPAN • Repository di template su CVS
  • 14. www.perl.it
  • 15. www.perl.it
  • 16. Widget
  • 17. Widget [% WRAPPER wMessage.ttml wTopic = 'Documenti' wImg = 'img/gui/wd.gif' wAlt = 'D:' title = 'Perlfunc' subtitle = 'Funzioni Perl in italiano' icon = 'img/icons/faq.png' url = 'documenti/perlfunc/index.html' %]La documentazione completa delle funzioni Perl in italiano. [% END %]
  • 18. Configurazione di ttree src = /home/larsen/src/perlit/src dest = /home/httpd/perl.it lib = /home/larsen/src/perlit/lib recurse perl5lib = /home/larsen/src/perlit/lib plugin_base = MyPlugin accept = .(html|css|txt|js)$ copy = .(gif|jpg|png|pl)$ ignore = .(swp)$ pre_process = ./lib/config
  • 19. ttree
  • 20. Plugin
  • 21. MyPlugin::Blog package MyPlugin::Blog; use strict; use warnings; use Template::Plugin; use base qw/ Template::Plugin /; use MT; use MT::Entry; sub new { ... } sub get_entry { my $self = shift; my $entry_id = shift; my $entry = MT::Entry->load( $entry_id ); return $entry; }
  • 22. MyPlugin::Blog in azione [% USE Blog %] [% entry = Blog.get_entry( entry_id ) %] <tbody> <tr> <td class=quot;textquot;> <p>[% entry.excerpt %] <a href=quot;[% entry.permalink %]quot; title=quot;Leggi tuttoquot; target=quot;_selfquot; >Continua</a> </p> </td> </tr> </tbody>
  • 23. Mastering TT2
  • 24. Architettura Template Template::Service Template::Provider Template::Context Template::Stash Template::Parser Template::Document Template::Exception
  • 25. Architettura use Template; use Template::Constants qw/ :debug /; my $tt = Template->new( DEBUG => DEBUG_SERVICE | DEBUG_CONTEXT | DEBUG_PROVIDER ); $tt->process( 'template.tt2', { world => quot;Repubblica del Perlquot; } ) || die $tt->error(); Hello, [% world %]!
  • 26. Architettura larsen@alice:~$ perl test.pl [Template::Provider] creating cache of unlimited slots for [ . ] [Template::Service] process(template.tt2, HASH(0x832f75c)) [Template::Context] template(template.tt2) [Template::Context] looking for block [template.tt2] [Template::Context] asking providers for [template.tt2] [] [Template::Provider] _fetch_path(template.tt2) [Template::Provider] searching path: ./template.tt2 [Template::Provider] _load(./template.tt2, template.tt2) [Template::Provider] _compile(HASH(0x832f888), <no compfile>) [Template::Provider] _store(./template.tt2, Template::Document=HASH(0x8412128)) [Template::Provider] adding new cache entry [Template::Service] PROCESS: Template::Document=HASH(0x8412128) [Template::Context] process([ Template::Document=HASH(0x8412128) ], <no params>, <unlocalized>) [Template::Context] template(Template::Document=HASH(0x8412128)) Hello, Repubblica del Perl! larsen@alice:~$
  • 27. Gli stessi princìpi del Perl • Potenza • Semplicità • Disciplina • Scalabilità • Stile
  • 28. Approfondimenti • http://www.tt2.org • Mailing list • Perl Template Toolkit, O’Reilly • perldoc Template
  • 29. Grazie :) larsen@perl.it http://larsen.perlmonk.org