AbstractNode.php

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<?php
namespace TYPO3\CMS\Fluid\Core\Parser\SyntaxTree;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

abstract class AbstractNode implements \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\NodeInterface {

    protected $childNodes = array();

    public function evaluateChildNodes(\TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface $renderingContext) {
        $output = NULL;
        foreach ($this->childNodes as $subNode) {
            if ($output === NULL) {
                $output = $subNode->evaluate($renderingContext);
            } else {
                if (is_object($output)) {
                    if (!method_exists($output, '__toString')) {
                        throw new \TYPO3\CMS\Fluid\Core\Parser\Exception('Cannot cast object of type "' . get_class($output) . '" to string.', 1248356140);
                    }
                    $output = $output->__toString();
                } else {
                    $output = (string) $output;
                }
                $subNodeOutput = $subNode->evaluate($renderingContext);

                if (is_object($subNodeOutput)) {
                    if (!method_exists($subNodeOutput, '__toString')) {
                        throw new \TYPO3\CMS\Fluid\Core\Parser\Exception('Cannot cast object of type "' . get_class($subNodeOutput) . '" to string.', 1273753083);
                    }
                    $output .= $subNodeOutput->__toString();
                } else {
                    $output .= (string) $subNodeOutput;
                }
            }
        }
        return $output;
    }

    public function getChildNodes() {
        return $this->childNodes;
    }

    public function addChildNode(\TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\NodeInterface $childNode) {
        $this->childNodes[] = $childNode;
    }
}