source: pro-violet-viettel/sourcecode/application/third_party/Twig/Node/Expression/Test.php

<?php

/*
 * This file is part of Twig.
 *
 * (c) 2010 Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
class Twig_Node_Expression_Test extends Twig_Node_Expression
{
    public function __construct(Twig_NodeInterface $node, $name, Twig_NodeInterface $arguments = null, $lineno)
    {
        parent::__construct(array('node' => $node, 'arguments' => $arguments), array('name' => $name), $lineno);
    }

    public function compile(Twig_Compiler $compiler)
    {
        $testMap = $compiler->getEnvironment()->getTests();
        if (!isset($testMap[$this->getAttribute('name')])) {
            throw new Twig_Error_Syntax(sprintf('The test "%s" does not exist', $this->getAttribute('name')), $this->getLine());
        }

        // defined is a special case
        if ('defined' === $this->getAttribute('name')) {
            if ($this->getNode('node') instanceof Twig_Node_Expression_Name) {
                $compiler
                    ->raw($testMap['defined']->compile().'(')
                    ->repr($this->getNode('node')->getAttribute('name'))
                    ->raw(', $context)')
                ;
            } elseif ($this->getNode('node') instanceof Twig_Node_Expression_GetAttr) {
                $this->getNode('node')->setAttribute('is_defined_test', true);
                $compiler->subcompile($this->getNode('node'));
            } else {
                throw new Twig_Error_Syntax('The "defined" test only works with simple variables', $this->getLine());
            }
            return;
        }

        $compiler
            ->raw($testMap[$this->getAttribute('name')]->compile().'(')
            ->subcompile($this->getNode('node'))
        ;

        if (null !== $this->getNode('arguments')) {
            $compiler->raw(', ');

            $max = count($this->getNode('arguments')) - 1;
            foreach ($this->getNode('arguments') as $i => $node) {
                $compiler->subcompile($node);

                if ($i != $max) {
                    $compiler->raw(', ');
                }
            }
        }

        $compiler->raw(')');
    }
}