<?php

declare(strict_types=1);

/*
 * This file is developed by evoWeb.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 */

namespace Evoweb\EwBase\ViewHelpers;

use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;

/**
 * Variable assigning ViewHelper
 *
 * Assigns one template variable which will exist also
 * after the ViewHelper is done rendering, i.e. adds
 * template variables.
 *
 * If you require a variable assignment which does not
 * exist in the template after a piece of Fluid code
 * is rendered, consider using ``f:alias`` ViewHelper instead.
 *
 * Usages:
 *
 * ::
 *
 *     {f:variable(name: 'myvariable', value: 'some value')}
 *     <f:variable name="myvariable">some value</f:variable>
 *     {oldvariable -> f:format.htmlspecialchars() -> f:variable(name: 'newvariable')}
 *     <f:variable name="myvariable"><f:format.htmlspecialchars>{oldvariable}</f:format.htmlspecialchars></f:variable>
 *
 * @see \TYPO3Fluid\Fluid\ViewHelpers\IfViewHelper
 * @api
 */
class ReplaceViewHelper extends AbstractViewHelper
{
    public function initializeArguments(): void
    {
        $this->registerArgument('value', 'string', 'String to replace in');
        $this->registerArgument('search', 'string', 'Search string');
        $this->registerArgument('replace', 'string', 'Replace value');
    }

    public function render(): string
    {
        $content = $this->arguments['value'];
        if ($content === null) {
            $content = $this->renderChildren();
        }

        return str_replace($this->arguments['search'], $this->arguments['replace'], $content);
    }
}