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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /** @formatter:off  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * ******************************************************************  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Created by   Marko Kungla on Jun 29, 2016 - 8:06:17 AM  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Contact      [email protected]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright   2016 Marko Kungla - https://github.com/mkungla  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license     The MIT License (MIT)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @category       AframeVR  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package        aframe-php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Lang         PHP (php version >= 7)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Encoding     UTF-8  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * File         AframeDOMProcessor.php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Code format  PSR-2 and 12  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link        https://github.com/mkungla/aframe-php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 ^ @issues      https://github.com/mkungla/aframe-php/issues  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * ********************************************************************  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Contributors:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Marko Kungla <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * ********************************************************************  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Comments:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @formatter:on */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace AframeVR\Core\DOM;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait AframeDOMProcessor  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Add document comment for formatting  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $element              | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $comment              | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function appendFormatComment(string $element, string $comment)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->formatOutput) { | 
            
                            
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                            $com = $this->docObj->createComment($comment);  | 
            
                            
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                            $this->{$element}->appendChild($com); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Correct html format for tags which are not supported by DOMDocument  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $html              | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function correctOutputFormat($html)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $tags = array(  | 
            
                            
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                            '<!--',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            '-->',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            '<a-assets>',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            '</a-assets>',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            '</a-scene>'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $values = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            '',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            "\t",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            "\n\t<a-assets>",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            "\n\t</a-assets>",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            "\n</a-scene>"  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return str_ireplace($tags, $values, $html);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Prepeare head  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function renderHead()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $title = $this->docObj->createElement('title', $this->scene_title); | 
            
                            
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                        $this->head->appendChild($title);  | 
            
                            
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                        $this->appendDefaultMetaTags();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->appendCDN();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Append deffault metatags  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function appendDefaultMetaTags()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->appendMetaTag(array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'name' => 'description',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'content' => $this->scene_description  | 
            
                            
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                        ));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($this->getDefaultMetaTags() as $tag)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->appendMetaTag($tag);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get default meta tags  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getDefaultMetaTags(): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $dmt = array();  | 
            
                            
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                        $dmt[0]['charset'] = 'utf-8';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $dmt[1]['name'] = 'viewport';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $vp = 'width=device-width,initial-scale=1,maximum-scale=1,shrink-to-fit=no,user-scalable=no,minimal-ui';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $dmt[1]['content'] = $vp;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $dmt[2]['name'] = 'mobile-web-app-capable';  | 
            
                            
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                        $dmt[2]['content'] = 'yes';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $dmt[3]['name'] = 'theme-color';  | 
            
                            
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                        $dmt[3]['content'] = 'black';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $dmt;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * If requested by user use aframe CDN  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                             5                          | 
                
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                    protected function appendCDN()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->use_cdn) { | 
            
                            
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                             3                          | 
                
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                            $cdn_script = $this->docObj->createElement('script'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    128
                 | 
                                    
                             3                          | 
                
                 | 
                            $cdn_script->setAttribute('src', $this->aframe_cdn); | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    129
                 | 
                                    
                             3                          | 
                
                 | 
                            $this->head->appendChild($cdn_script);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
                 | 
                                    
                             5                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                     * Prepare body  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                     * @return void  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                             5                          | 
                
                 | 
                    protected function renderBody()  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                             5                          | 
                
                 | 
                        $this->body->appendChild($this->scene);  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                                                                        
                        
                         
                                                                                        
                                                                                            
                                                                                     
                     | 
                
            
                                                                        
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                             5                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                     * Create meta tags  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                     * @param array $attr              | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                             5                          | 
                
                 | 
                    protected function appendMetaTag(array $attr)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                             5                          | 
                
                 | 
                        $metatag = $this->docObj->createElement('meta'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                             5                          | 
                
                 | 
                        foreach ($attr as $key => $val)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                             5                          | 
                
                 | 
                            $metatag->setAttribute($key, $val);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                             5                          | 
                
                 | 
                        $this->head->appendChild($metatag);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                             5                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                     * Creates an empty DOMDocumentType object  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $doctype              | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                             71                          | 
                
                 | 
                    protected function createDocType(string $doctype)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                             71                          | 
                
                 | 
                        $this->doctypeObj = $this->createDocumentType($doctype);  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                                                                        
                        
                         
                                                                                        
                                                                                            
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                             71                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                     * Creates a DOMDocument object of the specified type with its document element  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                             71                          | 
                
                 | 
                    protected function createAframeDocument()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                             71                          | 
                
                 | 
                        $this->docObj = $this->createDocument(null, 'html', $this->doctypeObj);  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                             71                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                     * Create dom elements for DOMDocument  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    179
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    180
                 | 
                                    
                                                     | 
                
                 | 
                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    181
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    182
                 | 
                                    
                             71                          | 
                
                 | 
                    protected function documentBootstrap()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    183
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    184
                 | 
                                    
                                                     | 
                
                 | 
                        /* Create <head> element */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    185
                 | 
                                    
                             71                          | 
                
                 | 
                        $this->head = $this->docObj->createElement('head'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    186
                 | 
                                    
                                                     | 
                
                 | 
                        /* Create <body> element */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    187
                 | 
                                    
                             71                          | 
                
                 | 
                        $this->body = $this->docObj->createElement('body', $this->formatOutput ? "\n" : ''); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    188
                 | 
                                    
                                                     | 
                
                 | 
                        /* Create <a-scene> element */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    189
                 | 
                                    
                             71                          | 
                
                 | 
                        $this->scene = $this->docObj->createElement('a-scene'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    190
                 | 
                                    
                                                     | 
                
                 | 
                        /* Create <a-assets> element */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    191
                 | 
                                    
                             71                          | 
                
                 | 
                        $this->assets = $this->docObj->createElement('a-assets'); | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    192
                 | 
                                    
                             71                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    193
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    194
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: