Twig/src/Node/PrintNode.php

<?php

/*
 * This file is part of Twig.
 *
 * (c) Fabien Potencier
 * (c) Armin Ronacher
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig\Node;

use Twig\Compiler;
use Twig\Node\Expression\AbstractExpression;

/**
 * Represents a node that outputs an expression.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class PrintNode extends Node implements NodeOutputInterface
{
    public function __construct(AbstractExpression $expr, int $lineno, ?string $tag = null)
    {
        parent::__construct(['expr' => $expr], [], $lineno, $tag);
    }

    public function compile(Compiler $compiler): void
    {
        $compiler->addDebugInfo($this);

        if ($compiler->getEnvironment()->useYield()) {
            $compiler->write('yield ');
        } else {
            $compiler
                ->checkForOutput(false)
                ->write('echo ')
                ->checkForOutput(true)
            ;
        }

        $compiler
            ->subcompile($this->getNode('expr'))
            ->raw(";\n")
        ;
    }
}