* @author Kornel Lesiński * @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License * @version SVN: $Id$ * @link http://phptal.org/ */ /** * TAL Specifications 1.4 * * argument ::= expression * * Example: * *

* * * * * @package PHPTAL * @subpackage Php.attribute.tal * @author Laurent Bedubourg */ 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('phptal_true(' . $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', $this->phpelement->getSourceFile(), $this->phpelement->getSourceLine()); } }