AbstractConditionViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\Core\ViewHelper;

/*                                                                        *
 * 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 AbstractConditionViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper implements \TYPO3\CMS\Fluid\Core\ViewHelper\Facets\ChildNodeAccessInterface, \TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface {

    private $childNodes = array();

    public function setChildNodes(array $childNodes) {
        $this->childNodes = $childNodes;
    }

    public function __construct() {
        $this->registerArgument('then', 'mixed', 'Value to be returned if the condition if met.', FALSE);
        $this->registerArgument('else', 'mixed', 'Value to be returned if the condition if not met.', FALSE);
    }

    protected function renderThenChild() {
        if ($this->hasArgument('then')) {
            return $this->arguments['then'];
        }
        if ($this->hasArgument('__thenClosure')) {
            $thenClosure = $this->arguments['__thenClosure'];
            return $thenClosure();
        } elseif ($this->hasArgument('__elseClosure') || $this->hasArgument('else')) {
            return '';
        }

        $elseViewHelperEncountered = FALSE;
        foreach ($this->childNodes as $childNode) {
            if ($childNode instanceof \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode
                && $childNode->getViewHelperClassName() === 'TYPO3\\CMS\\Fluid\\ViewHelpers\\ThenViewHelper') {
                $data = $childNode->evaluate($this->renderingContext);
                return $data;
            }
            if ($childNode instanceof \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode
                && $childNode->getViewHelperClassName() === 'TYPO3\\CMS\\Fluid\\ViewHelpers\\ElseViewHelper') {
                $elseViewHelperEncountered = TRUE;
            }
        }

        if ($elseViewHelperEncountered) {
            return '';
        } else {
            return $this->renderChildren();
        }
    }

    protected function renderElseChild() {
        if ($this->hasArgument('else')) {
            return $this->arguments['else'];
        }
        if ($this->hasArgument('__elseClosure')) {
            $elseClosure = $this->arguments['__elseClosure'];
            return $elseClosure();
        }
        foreach ($this->childNodes as $childNode) {
            if ($childNode instanceof \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode
                && $childNode->getViewHelperClassName() === 'TYPO3\\CMS\\Fluid\\ViewHelpers\\ElseViewHelper') {
                return $childNode->evaluate($this->renderingContext);
            }
        }

        return '';
    }

    public function compile($argumentsVariableName, $renderChildrenClosureVariableName, &$initializationPhpCode, \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\AbstractNode $syntaxTreeNode, \TYPO3\CMS\Fluid\Core\Compiler\TemplateCompiler $templateCompiler) {
        foreach ($syntaxTreeNode->getChildNodes() as $childNode) {
            if ($childNode instanceof \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode
                && $childNode->getViewHelperClassName() === 'TYPO3\\CMS\\Fluid\\ViewHelpers\\ThenViewHelper') {

                $childNodesAsClosure = $templateCompiler->wrapChildNodesInClosure($childNode);
                $initializationPhpCode .= sprintf('%s[\'__thenClosure\'] = %s;', $argumentsVariableName, $childNodesAsClosure) . chr(10);
            }
            if ($childNode instanceof \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode
                && $childNode->getViewHelperClassName() === 'TYPO3\\CMS\\Fluid\\ViewHelpers\\ElseViewHelper') {

                $childNodesAsClosure = $templateCompiler->wrapChildNodesInClosure($childNode);
                $initializationPhpCode .= sprintf('%s[\'__elseClosure\'] = %s;', $argumentsVariableName, $childNodesAsClosure) . chr(10);
            }
        }
        return \TYPO3\CMS\Fluid\Core\Compiler\TemplateCompiler::SHOULD_GENERATE_VIEWHELPER_INVOCATION;
    }
}