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<?php
/**
* PHPTAL templating engine
*
* PHP Version 5
*
* @category HTML
* @package PHPTAL
* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
* @author Kornel Lesiński <kornel@aardvarkmedia.co.uk>
* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License
* @version SVN: $Id: Condition.php 671 2009-07-11 18:11:35Z kornel $
* @link http://phptal.org/
*/
/**
* TAL Specifications 1.4
*
* argument ::= expression
*
* Example:
*
* <p tal:condition="here/copyright"
* tal:content="here/copyright">(c) 2000</p>
*
*
*
*
* @package PHPTAL
* @subpackage Php.attribute.tal
* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
*/
class PHPTAL_Php_Attribute_TAL_Condition
extends PHPTAL_Php_Attribute
implements PHPTAL_Php_TalesChainReader
{
private $expressions = array();
public function before(PHPTAL_Php_CodeWriter $codewriter)
{
$code = $codewriter->evaluateExpression($this->expression);
// If it's a chained expression build a new code path
if (is_array($code)) {
$this->expressions = array();
$executor = new PHPTAL_Php_TalesChainExecutor($codewriter, $code, $this);
return;
}
// Force a falsy condition if the nothing keyword is active
if ($code == PHPTAL_Php_TalesInternal::NOTHING_KEYWORD) {
$code = 'false';
}
$codewriter->doIf($code);
}
public function after(PHPTAL_Php_CodeWriter $codewriter)
{
$codewriter->doEnd('if');
}
public function talesChainPart(PHPTAL_Php_TalesChainExecutor $executor, $exp, $islast)
{
// check if the expression is empty
if ($exp !== 'false') {
$this->expressions[] = '!phptal_isempty(' . $exp . ')';
}
if ($islast) {
// for the last one in the chain build a ORed condition
$executor->getCodeWriter()->doIf( implode(' || ', $this->expressions ) );
// The executor will always end an if so we output a dummy if
$executor->doIf('false');
}
}
public function talesChainNothingKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
// end the chain
$this->talesChainPart($executor, 'false', true);
$executor->breakChain();
}
public function talesChainDefaultKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
throw new PHPTAL_ParserException('\'default\' keyword not allowed on conditional expressions');
}
}
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