| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  | namespace TYPO3Fluid\Fluid\Core\ViewHelper; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  | /* | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  |  * This file belongs to the package "TYPO3 Fluid". | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  |  * See LICENSE.txt that was shipped with this package. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  | use TYPO3Fluid\Fluid\Core\Compiler\TemplateCompiler; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | use TYPO3Fluid\Fluid\Core\Parser\SyntaxTree\NodeInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  | use TYPO3Fluid\Fluid\Core\Parser\SyntaxTree\ViewHelperNode; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  | use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  | use TYPO3Fluid\Fluid\ViewHelpers\ElseViewHelper; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  | use TYPO3Fluid\Fluid\ViewHelpers\ThenViewHelper; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  |  * This view helper is an abstract ViewHelper which implements an if/else condition. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |  * = Usage = | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |  * To create a custom Condition ViewHelper, you need to subclass this class, and | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |  * implement your own render() method. Inside there, you should call $this->renderThenChild() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |  * if the condition evaluated to TRUE, and $this->renderElseChild() if the condition evaluated | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  |  * to FALSE. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |  * Every Condition ViewHelper has a "then" and "else" argument, so it can be used like: | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |  * <[aConditionViewHelperName] .... then="condition true" else="condition false" />, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |  * or as well use the "then" and "else" child nodes. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |  * @see TYPO3Fluid\Fluid\ViewHelpers\IfViewHelper for a more detailed explanation and a simple usage example. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |  * Make sure to NOT OVERRIDE the constructor. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |  * @api | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  | abstract class AbstractConditionViewHelper extends AbstractViewHelper | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  | { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |      * @var boolean | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |     protected $escapeOutput = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |      * Initializes the "then" and "else" arguments | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |     public function initializeArguments() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |         $this->registerArgument('then', 'mixed', 'Value to be returned if the condition if met.', false); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |         $this->registerArgument('else', 'mixed', 'Value to be returned if the condition if not met.', false); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |      * Renders <f:then> child if $condition is true, otherwise renders <f:else> child. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |      * Method which only gets called if the template is not compiled. For static calling, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |      * the then/else nodes are converted to closures and condition evaluation closures. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |      * @return string the rendered string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |      * @api | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |     public function render() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |         if (static::verdict($this->arguments, $this->renderingContext)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |             return $this->renderThenChild(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |         return $this->renderElseChild(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |      * @param array $arguments | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |      * @param \Closure $renderChildrenClosure | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  |      * @param RenderingContextInterface $renderingContext | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  |      * @return mixed | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 74 |  |  |     public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 75 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  |         if (static::verdict($arguments, $renderingContext)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  |             if (isset($arguments['then'])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |                 return $arguments['then']; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  |             if (isset($arguments['__thenClosure'])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  |                 return $arguments['__thenClosure'](); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 82 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 83 |  |  |         } elseif (!empty($arguments['__elseClosures'])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 84 |  |  |             $elseIfClosures = isset($arguments['__elseifClosures']) ? $arguments['__elseifClosures'] : []; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 85 |  |  |             return static::evaluateElseClosures($arguments['__elseClosures'], $elseIfClosures, $renderingContext); | 
                            
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                | 86 |  |  |         } elseif (array_key_exists('else', $arguments)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 87 |  |  |             return $arguments['else']; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 88 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 89 |  |  |         return ''; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 90 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 91 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 92 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 93 |  |  |      * Static method which can be overridden by subclasses. If a subclass | 
            
                                                                                                            
                            
            
                                    
            
            
                | 94 |  |  |      * requires a different (or faster) decision then this method is the one | 
            
                                                                                                            
                            
            
                                    
            
            
                | 95 |  |  |      * to override and implement. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 96 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  |      * @param array $arguments | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  |      * @param RenderingContextInterface $renderingContext | 
            
                                                                                                            
                            
            
                                    
            
            
                | 99 |  |  |      * @return bool | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 100 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 101 |  |  |     public static function verdict(array $arguments, RenderingContextInterface $renderingContext) | 
                            
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                | 102 |  |  |     { | 
            
                                                                        
                            
            
                                    
            
            
                | 103 |  |  |         return static::evaluateCondition($arguments); | 
                            
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                | 104 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |      * Static method which can be overridden by subclasses. If a subclass | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  |      * requires a different (or faster) decision then this method is the one | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  |      * to override and implement. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 110 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 111 |  |  |      * Note: method signature does not type-hint that an array is desired, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 112 |  |  |      * and as such, *appears* to accept any input type. There is no type hint | 
            
                                                                                                            
                            
            
                                    
            
            
                | 113 |  |  |      * here for legacy reasons - the signature is kept compatible with third | 
            
                                                                                                            
                            
            
                                    
            
            
                | 114 |  |  |      * party packages which depending on PHP version would error out if this | 
            
                                                                                                            
                            
            
                                    
            
            
                | 115 |  |  |      * signature was not compatible with that of existing and in-production | 
            
                                                                                                            
                            
            
                                    
            
            
                | 116 |  |  |      * subclasses that will be using this base class in the future. Let this | 
            
                                                                                                            
                            
            
                                    
            
            
                | 117 |  |  |      * be a warning if someone considers changing this method signature! | 
            
                                                                                                            
                            
            
                                    
            
            
                | 118 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 119 |  |  |      * @deprecated Deprecated in favor of ClassName::verdict($arguments, renderingContext), will no longer be called in 3.0 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 120 |  |  |      * @param array|NULL $arguments | 
            
                                                                                                            
                            
            
                                    
            
            
                | 121 |  |  |      * @return boolean | 
            
                                                                                                            
                            
            
                                    
            
            
                | 122 |  |  |      * @api | 
            
                                                                                                            
                            
            
                                    
            
            
                | 123 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 124 |  |  |     protected static function evaluateCondition($arguments = null) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 125 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 126 |  |  |         return isset($arguments['condition']) && (bool)($arguments['condition']); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 127 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 128 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 129 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 130 |  |  |      * @param array $closures | 
            
                                                                                                            
                            
            
                                    
            
            
                | 131 |  |  |      * @param array $conditionClosures | 
            
                                                                                                            
                            
            
                                    
            
            
                | 132 |  |  |      * @param RenderingContextInterface $renderingContext | 
            
                                                                                                            
                            
            
                                    
            
            
                | 133 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 134 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 135 |  |  |     private static function evaluateElseClosures(array $closures, array $conditionClosures, RenderingContextInterface $renderingContext) | 
                            
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                | 136 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 137 |  |  |         foreach ($closures as $elseNodeIndex => $elseNodeClosure) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 138 |  |  |             if (!isset($conditionClosures[$elseNodeIndex])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 139 |  |  |                 return $elseNodeClosure(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 140 |  |  |             } else { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 141 |  |  |                 if ($conditionClosures[$elseNodeIndex]()) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 142 |  |  |                     return $elseNodeClosure(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 143 |  |  |                 } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 144 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 145 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 146 |  |  |         return ''; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 147 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 148 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 149 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 150 |  |  |      * Returns value of "then" attribute. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 151 |  |  |      * If then attribute is not set, iterates through child nodes and renders ThenViewHelper. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 152 |  |  |      * If then attribute is not set and no ThenViewHelper and no ElseViewHelper is found, all child nodes are rendered | 
            
                                                                                                            
                            
            
                                    
            
            
                | 153 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 154 |  |  |      * @return mixed rendered ThenViewHelper or contents of <f:if> if no ThenViewHelper was found | 
            
                                                                                                            
                            
            
                                    
            
            
                | 155 |  |  |      * @api | 
            
                                                                                                            
                            
            
                                    
            
            
                | 156 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 157 |  |  |     protected function renderThenChild() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 158 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 159 |  |  |         if ($this->hasArgument('then')) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 160 |  |  |             return $this->arguments['then']; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 161 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 162 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 163 |  |  |         $elseViewHelperEncountered = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 164 |  |  |         foreach (($this->viewHelperNode ?? $this)->getChildNodes() as $childNode) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 165 |  |  |             if ($childNode instanceof ThenViewHelper | 
            
                                                                                                            
                            
            
                                    
            
            
                | 166 |  |  |                 || ($childNode instanceof ViewHelperNode && substr($childNode->getViewHelperClassName(), -14) === 'ThenViewHelper') | 
            
                                                                                                            
                            
            
                                    
            
            
                | 167 |  |  |             ) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 168 |  |  |                 $data = $childNode->evaluate($this->renderingContext); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 169 |  |  |                 return $data; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 170 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 171 |  |  |             if ($childNode instanceof ElseViewHelper | 
            
                                                                                                            
                            
            
                                    
            
            
                | 172 |  |  |                 || ($childNode instanceof ViewHelperNode && substr($childNode->getViewHelperClassName(), -14) === 'ElseViewHelper') | 
            
                                                                                                            
                            
            
                                    
            
            
                | 173 |  |  |             ) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 174 |  |  |                 $elseViewHelperEncountered = true; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 175 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 176 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 177 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 178 |  |  |         if ($elseViewHelperEncountered) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 179 |  |  |             return ''; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 180 |  |  |         } else { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 181 |  |  |             return $this->renderChildren(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 182 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 183 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 184 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 185 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 186 |  |  |      * Returns value of "else" attribute. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 187 |  |  |      * If else attribute is not set, iterates through child nodes and renders ElseViewHelper. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 188 |  |  |      * If else attribute is not set and no ElseViewHelper is found, an empty string will be returned. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 189 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 190 |  |  |      * @return string rendered ElseViewHelper or an empty string if no ThenViewHelper was found | 
            
                                                                                                            
                            
            
                                    
            
            
                | 191 |  |  |      * @api | 
            
                                                                                                            
                            
            
                                    
            
            
                | 192 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 193 |  |  |     protected function renderElseChild() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 194 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 195 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 196 |  |  |         if ($this->hasArgument('else')) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 197 |  |  |             return $this->arguments['else']; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 198 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 199 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 200 |  |  |         /** @var ViewHelperNode|NULL $elseNode */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 201 |  |  |         $elseNode = null; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 202 |  |  |         foreach (($this->viewHelperNode ?? $this)->getChildNodes() as $childNode) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 203 |  |  |             if ($childNode instanceof ElseViewHelper | 
            
                                                                                                            
                            
            
                                    
            
            
                | 204 |  |  |                 || ($childNode instanceof ViewHelperNode && substr($childNode->getViewHelperClassName(), -14) === 'ElseViewHelper') | 
            
                                                                                                            
                            
            
                                    
            
            
                | 205 |  |  |             ) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 206 |  |  |                 $arguments = $childNode->getParsedArguments(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 207 |  |  |                 if (isset($arguments['if'])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 208 |  |  |                     $condition = $arguments['if']; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 209 |  |  |                     if ($condition instanceof NodeInterface) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 210 |  |  |                         $condition = $condition->evaluate($this->renderingContext); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 211 |  |  |                     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 212 |  |  |                     if ((bool)$condition === true) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 213 |  |  |                         return $childNode->evaluate($this->renderingContext); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 214 |  |  |                     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 215 |  |  |                 } else { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 216 |  |  |                     $elseNode = $childNode; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 217 |  |  |                 } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 218 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 219 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 220 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 221 |  |  |         return $elseNode instanceof NodeInterface ? $elseNode->evaluate($this->renderingContext) : ''; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 222 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 223 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 224 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 225 |  |  |      * The compiled ViewHelper adds two new ViewHelper arguments: __thenClosure and __elseClosure. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 226 |  |  |      * These contain closures which are be executed to render the then(), respectively else() case. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 227 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 228 |  |  |      * @param string $argumentsName | 
            
                                                                                                            
                            
            
                                    
            
            
                | 229 |  |  |      * @param string $closureName | 
            
                                                                                                            
                            
            
                                    
            
            
                | 230 |  |  |      * @param string $initializationPhpCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 231 |  |  |      * @param ViewHelperNode $node | 
            
                                                                                                            
                            
            
                                    
            
            
                | 232 |  |  |      * @param TemplateCompiler $compiler | 
            
                                                                                                            
                            
            
                                    
            
            
                | 233 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 234 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 235 |  |  |     public function compile($argumentsName, $closureName, &$initializationPhpCode, ViewHelperNode $node, TemplateCompiler $compiler) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 236 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 237 |  |  |         $thenViewHelperEncountered = $elseViewHelperEncountered = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 238 |  |  |         foreach ($node->getChildNodes() as $childNode) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 239 |  |  |             if ($childNode instanceof ViewHelperNode || $childNode instanceof ViewHelperInterface) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 240 |  |  |                 $viewHelperClassName = $childNode instanceof ViewHelperNode ? $childNode->getViewHelperClassName() : get_class($childNode); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 241 |  |  |                 if (substr($viewHelperClassName, -14) === 'ThenViewHelper') { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 242 |  |  |                     $thenViewHelperEncountered = true; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 243 |  |  |                     $childNodesAsClosure = $compiler->wrapChildNodesInClosure($childNode); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 244 |  |  |                     $initializationPhpCode .= sprintf('%s[\'__thenClosure\'] = %s;', $argumentsName, $childNodesAsClosure) . chr(10); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 245 |  |  |                 } elseif (substr($viewHelperClassName, -14) === 'ElseViewHelper') { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 246 |  |  |                     $elseViewHelperEncountered = true; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 247 |  |  |                     $childNodesAsClosure = $compiler->wrapChildNodesInClosure($childNode); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 248 |  |  |                     $initializationPhpCode .= sprintf('%s[\'__elseClosures\'][] = %s;', $argumentsName, $childNodesAsClosure) . chr(10); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 249 |  |  |                     $arguments = $childNode->getParsedArguments(); | 
                            
                    |  |  |  | 
                                                                                        
                                                                                     | 
            
                                                                                                            
                            
            
                                    
            
            
                | 250 |  |  |                     if (isset($arguments['if'])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 251 |  |  |                         // The "else" has an argument, indicating it has a secondary (elseif) condition. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 252 |  |  |                         // Compile a closure which will evaluate the condition. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 253 |  |  |                         $elseIfConditionAsClosure = $compiler->wrapViewHelperNodeArgumentEvaluationInClosure($childNode, 'if'); | 
                            
                    |  |  |  | 
                                                                                        
                                                                                     | 
            
                                                                                                            
                            
            
                                    
            
            
                | 254 |  |  |                         $initializationPhpCode .= sprintf('%s[\'__elseifClosures\'][] = %s;', $argumentsName, $elseIfConditionAsClosure) . chr(10); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 255 |  |  |                     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 256 |  |  |                 } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 257 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 258 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 259 |  |  |         if (!$thenViewHelperEncountered && !$elseViewHelperEncountered && !isset($node->getParsedArguments()['then'])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 260 |  |  |             $initializationPhpCode .= sprintf('%s[\'__thenClosure\'] = %s;', $argumentsName, $closureName) . chr(10); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 261 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 262 |  |  |         return parent::compile($argumentsName, $closureName, $initializationPhpCode, $node, $compiler); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 263 |  |  |     } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 264 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 265 |  |  |  | 
            
                        
Let’s assume you have a class which uses late-static binding:
}
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClassto useselfinstead: