Open Power Template

<h2 id="history">History</h2>
<p>The project started in November 2004, as a template engine for a discussion board project inspired by <a href="/facts/Smarty_(template_engine)/ayxNIBqT">Smarty</a>. While it later failed, the library became independent. In July 2006, the version 1.0.0 was released. It offered a template language with Smarty-like syntax and a small set of declarative instructions.
</p><p>In January 2007, the developers release the version 1.1.0 which brings some notable improvements, such as <a href="/facts/Pagination_(web)/Xy6LKzJ2">pagination</a> support and tree rendering.
</p><p>In January 2008, the developers form an open-source programming team, <i>Invenzzia</i> to develop OPT and other PHP projects. At the same time, the development of Open Power Template 2.0 began.
</p><p>The last version of the 1.1 branch was released in May 2008 and the group focused on the OPT 2.0 development. The new library went into the beta-stage in December and the first stable version was released in July 2009.
</p>
<h2 id="features">Features</h2>
<p>The OPT 2.0 template language is an <a href="/facts/XML/clNgUfWk">XML</a> application that allows the manipulation of the XHTML document structure. The other features are:
</p>
<ol><li>Template inheritance and other advanced template modularization mechanisms.</li>
<li><a href="/facts/Form_(web)/9Ivp2peo">Form</a> rendering support (<i>components</i>)</li>
<li>Abstract, declarative list generators (<i>sections</i>)</li>
<li>Automated filtering against <a href="/facts/Cross-site_scripting/dhtusKKm">cross-site scripting</a> attacks.</li>
<li>Internationalization support.</li>
<li>XML manipulation instructions.</li>
<li>Imperative control structures: conditions and loops.</li>
<li><a href="/facts/Expression_(programming)/eRlhoBeN">Expression</a> language optimized for XML and an abstraction layer making it independent from PHP data types and application-specific implementation details (<i>data formats</i>).</li></ol>
<p>The built-in XML parser can be reconfigured to parse certain HTML documents or plain text content.
</p>
<h2 id="sample-application">Sample application</h2>
<p>Since the templates are separated from the application logic, you need at least two files. The first one contains the presentation code as an XML template:
</p>
<?xml version="1.0" ?>
<opt:root escaping="yes">
  <opt:prolog version="1.0" />
  <opt:dtd template="xhtml10transitional" />
  <html>
    <head>
      <title>{$pageTitle}</title>
      <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    </head>
    <body>
      <p>{$introduction}</p>

<opt:show name="list">
      <ol>
        <li opt:section="list">{$list.item}</li>
      </ol>
      </opt:show>
    </body>
  </html>
</opt:root>

<p>The second one generates the data and configures the library:
</p>
require('./libs/Opl/Base.php');
Opl_Loader::setDirectory('./libs/');
Opl_Loader::register();

$tpl = new Opt_Class;
$tpl->sourceDir = './templates/';
$tpl->compileDir = './templates_c/';
$tpl->setup();

$view = new Opt_View('template.tpl');

// Assigning the script data to the template
$view->pageTitle = 'Sample OPT page';
$view->introduction = 'Sample text';
$view->list = array(0 =>
  array('item' => 'Item 1'),
  array('item' => 'Item 1'),
  array('item' => 'Item 1')
);
$view->setFormat('list', 'Array');

$output = new Opt_Output_Http;
$output->render($view);

<h2 id="links-and-references">Links and references</h2>
<ul><li><a href="http://www.invenzzia.org/en/projects/open-power-libraries/open-power-template">Open Power Template home page</a></li>
<li><a href="http://static.invenzzia.org/docs/opt/2_0/book/en/">Open Power Template user manual</a></li></ul>

Open Power Template open-in-new

Open Power Template