Elep

<?php
/**
 * @copyright	Copyright (C) 2011 Simplify Your Web, Inc. All rights reserved.
 * @license		GNU General Public License version 3 or later; see LICENSE.txt
 */

// no direct access
defined('_JEXEC') or die;

require_once dirname(__FILE__).'/vendor/Mobile_Detect.php';

jimport('joomla.filesystem.file');

class SYWUtilities
{
	static $mobile_detector = null;
	static $is_mobile = null;
	static $is_tablet = null;
	
	static $SVGSprites = array();

/*
	 * Determines if the device is mobile
	 */
	static public function isMobile($use_joomla_library = false)
	{
		if (!isset(self::$is_mobile)) {

if ($use_joomla_library) {
				jimport('joomla.environment.browser');
				$browser = JBrowser::getInstance();
				self::$is_mobile = $browser->isMobile();
			} else {
				self::$is_mobile = self::getMobileDetector()->isMobile();
			}
		}

return self::$is_mobile;
	}
	
	/*
	 * Determines if the device is a tablet
	 */
	static public function isTablet()
	{
		if (!isset(self::$is_tablet)) {
			self::$is_tablet = self::getMobileDetector()->isTablet();
		}
		
		return self::$is_tablet;
	}
	
	/**
	 * Get the mobile detector object
	 */
	static protected function getMobileDetector()
	{
		if (!isset(self::$mobile_detector)) {
			self::$mobile_detector = new SYW_Mobile_Detect;
		}
		
		return self::$mobile_detector;
	}

/*
	 * DEPRECATED
	 * Returns the google font found in a font family or false if none is found
	 * The returned font is of format "Google Font"
	 */
	static function googleFont($font_family)
	{
		$google_font = false;

$standard_fonts = array();
		$standard_fonts[] = "Palatino Linotype";
		$standard_fonts[] = "Book Antiqua";
		$standard_fonts[] = "MS Serif";
		$standard_fonts[] = "New York";
		$standard_fonts[] = "Times New Roman";
		$standard_fonts[] = "Arial Black";
		$standard_fonts[] = "Comic Sans MS";
		$standard_fonts[] = "Lucida Sans Unicode";
		$standard_fonts[] = "Lucida Grande";
		$standard_fonts[] = "Trebuchet MS";
		$standard_fonts[] = "MS Sans Serif";
		$standard_fonts[] = "Courier New";
		$standard_fonts[] = "Lucida Console";

$fonts = explode(',', $font_family);
		foreach ($fonts as $font) {
			if (substr_count($font, '"') == 2) { // found a font with 2 quotes
				$font = trim($font, '"');
				foreach ($standard_fonts as $standard_font) {
					if (strcasecmp($standard_font, $font) == 0) { // identical fonts
						return false;
					}
				}
				$google_font = $font;
			}
		}

return $google_font;
	}

/*
	* Returns the google font found in a font family
	* The returned font is of format "Google Font"
	*/
	static function getGoogleFont($font_family)
	{
		$google_font = '';

$fonts = explode(',', $font_family);
		foreach ($fonts as $font) {
			if (substr_count($font, '"') == 2) { // found a font with 2 quotes
				$font = trim($font, '"');
				foreach ($standard_fonts as $standard_font) {
					if (strcasecmp($standard_font, $font) == 0) { // identical fonts
						return '';
					}
				}
				$google_font = $font;
			}
		}

return $google_font;
	}

/*
	 * Transform "Google Font" into Google+Font for use in <link> tag
	 */
	static function getSafeGoogleFont($google_font)
	{
		$font = str_replace(' ', '+', $google_font); // replace spaces by +
		return trim($font, '"');
	}

/*
	 * Convert a hexa decimal color code to its RGB equivalent
	 *
	 * @param string $hexStr (hexadecimal color value)
	 * @param boolean $returnAsString (if set true, returns the value separated by the separator character. Otherwise returns associative array)
	 * @param string $seperator (to separate RGB values. Applicable only if second parameter is true.)
	 * @return array or string (depending on second parameter. Returns False if invalid hex color value)
	 */
	static function hex2RGB($hexStr, $returnAsString = false, $seperator = ',')
	{
	    $hexStr = preg_replace("/[^0-9A-Fa-f]/", '', $hexStr); // Gets a proper hex string
	    $rgbArray = array();
	    if (strlen($hexStr) == 6) { // if a proper hex code, convert using bitwise operation. No overhead... faster
	        $colorVal = hexdec($hexStr);
	        $rgbArray['red'] = 0xFF & ($colorVal >> 0x10);
	        $rgbArray['green'] = 0xFF & ($colorVal >> 0x8);
	        $rgbArray['blue'] = 0xFF & $colorVal;
	    } elseif (strlen($hexStr) == 3) { // if shorthand notation, need some string manipulations
	        $rgbArray['red'] = hexdec(str_repeat(substr($hexStr, 0, 1), 2));
	        $rgbArray['green'] = hexdec(str_repeat(substr($hexStr, 1, 1), 2));
	        $rgbArray['blue'] = hexdec(str_repeat(substr($hexStr, 2, 1), 2));
	    } else {
	        return false; //Invalid hex color code
	    }

return $returnAsString ? implode($seperator, $rgbArray) : $rgbArray; // returns the rgb string or the associative array
	}

/*
	 * Determine if the Joomla version is Joomla 3
	*/
	static function isJoomla3($and_over = false)
	{
		$version = new JVersion();
		$jversion = explode('.', $version->getShortVersion());
		if ($and_over) {
			if (intval($jversion[0]) > 2) { // Joomla! 3+
				return true;
			}
		} else {
			if (intval($jversion[0]) > 2 && intval($jversion[0]) < 4) { // Joomla! 3 only
				return true;
			}
		}

return false;
	}

/*
	 * Bootstrap conversion function (handles Bootstrap 2, 3, 4 and 5)
	 * returns default class if Bootstrap version is unknown (or 0)
	 */
	static function getBootstrapProperty($property_string, $bootstrap_version = 2)
	{
	    $bootstrap_version = intval($bootstrap_version);

$properties = explode(' ', $property_string); // may get properties like 'label label-info'

$converted_properties = array();

foreach ($properties as $property) {
		    switch ($property) {

// buttons

case 'btn': $converted_properties[] = 'btn'; break; // exists for all versions

case 'btn-default': // no default in B2, B4 nor B5
		        	if ($bootstrap_version == 0 || $bootstrap_version == 3) { $converted_properties[] = 'btn-default'; }
		            break;
		        case 'btn-primary': $converted_properties[] = 'btn-primary'; break;
		        case 'btn-secondary': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'btn-secondary'; }
		            break;
		        case 'btn-info': $converted_properties[] = 'btn-info'; break;
		        case 'btn-warning': $converted_properties[] = 'btn-warning'; break;
		        case 'btn-danger': $converted_properties[] = 'btn-danger'; break;
		        case 'btn-success': $converted_properties[] = 'btn-success'; break;
		        case 'btn-link': $converted_properties[] = 'btn-link'; break;
		        case 'btn-inverse': // no inverse for B3, B4 and B5
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2) { $converted_properties[] = 'btn-inverse'; }
		            break;
		        case 'btn-light': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'btn-light'; }
		            break;
		        case 'btn-dark': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'btn-dark'; }
		            break;
		        case 'btn-block': // removed in B5
		        	if ($bootstrap_version <= 4) { $converted_properties[] = 'btn-block'; } else { $converted_properties[] = 'w-100'; }
		        	break;
		        case 'btn-large':
		        	if ($bootstrap_version == 2) { $converted_properties[] = 'btn-large'; } else { $converted_properties[] = 'btn-lg'; }
		            break;
		        case 'btn-small':
		        	if ($bootstrap_version == 2) { $converted_properties[] = 'btn-small'; } else { $converted_properties[] = 'btn-sm'; }
		            break;
		        case 'btn-mini': // no xs in B4 nor B5
		        	if ($bootstrap_version == 2) { $converted_properties[] = 'btn-mini'; }
		        	if ($bootstrap_version == 0 || $bootstrap_version == 3) { $converted_properties[] = 'btn-xs'; }
		        	if ($bootstrap_version >= 4) { $converted_properties[] = 'btn-sm'; }
		            break;

// labels

case 'label':
		        	if ($bootstrap_version < 4) { $converted_properties[] = 'label'; } else { $converted_properties[] = 'badge'; }
		            break;
		        case 'label-default': // no default in B2, B4 nor B5
		        	if ($bootstrap_version == 0 || $bootstrap_version == 3) { $converted_properties[] = 'label-default'; }
		            break;
		        case 'label-primary': // no primary in B2
		        	if ($bootstrap_version == 0 || $bootstrap_version == 3) { $converted_properties[] = 'label-primary'; }
		            if ($bootstrap_version == 4) { $converted_properties[] = 'badge-primary'; }
		            if ($bootstrap_version == 5) { $converted_properties[] = 'bg-primary'; }
		            break;
		        case 'label-secondary': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 4) { $converted_properties[] = 'badge-secondary'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-secondary'; }
		            break;
		        case 'label-info':
		            if ($bootstrap_version < 4) { $converted_properties[] = 'label-info'; }
		            if ($bootstrap_version == 4) { $converted_properties[] = 'badge-info'; }
		            if ($bootstrap_version == 5) { $converted_properties[] = 'bg-info text-dark'; }
		            break;
		        case 'label-warning':
		            if ($bootstrap_version < 4) { $converted_properties[] = 'label-warning'; }
		        	if ($bootstrap_version == 4) { $converted_properties[] = 'badge-warning'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-warning text-dark'; }
		            break;
		        case 'label-important':
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2) { $converted_properties[] = 'label-important'; }
		            if ($bootstrap_version == 3) { $converted_properties[] = 'label-danger'; }
		            if ($bootstrap_version == 4) { $converted_properties[] = 'badge-danger'; }
		            if ($bootstrap_version == 5) { $converted_properties[] = 'bg-danger'; }
		            break;
		        case 'label-success':
		            if ($bootstrap_version < 4) { $converted_properties[] = 'label-success'; }
		        	if ($bootstrap_version == 4) { $converted_properties[] = 'badge-success'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-success'; }
		            break;
		        case 'label-inverse': // no inverse for B3, B4 and B5
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2) { $converted_properties[] = 'label-inverse'; }
		            break;
		        case 'label-light': // not in B2 nor B3
		        	if ($bootstrap_version == 0) { $converted_properties[] = 'label-light'; }
		        	if ($bootstrap_version == 4) { $converted_properties[] = 'badge-light'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-light text-dark'; }
		            break;
		        case 'label-dark': // not in B2 nor B3
		        	if ($bootstrap_version == 0) { $converted_properties[] = 'label-dark'; }
		        	if ($bootstrap_version == 4) { $converted_properties[] = 'badge-dark'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-dark'; }
		            break;

// badges-pills

case 'badge':
		        	if ($bootstrap_version < 4) { $converted_properties[] = 'badge'; }
		            if ($bootstrap_version == 4) { $converted_properties[] = 'badge badge-pill'; }
		            if ($bootstrap_version == 5) { $converted_properties[] = 'badge rounded-pill'; }
		            break;
		        case 'badge-default': // no default in B2, B3, B4 or B5
		        	if ($bootstrap_version == 0) { $converted_properties[] = 'badge-default'; }
		        	break;
		        case 'badge-primary': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 4) { $converted_properties[] = 'badge-primary'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-primary'; }
		            break;
		        case 'badge-secondary': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 4) { $converted_properties[] = 'badge-secondary'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-secondary'; }
		            break;
		        case 'badge-info': // not in B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2 || $bootstrap_version == 4) { $converted_properties[] = 'badge-info'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-info text-dark'; }
		            break;
		        case 'badge-warning': // not in B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2 || $bootstrap_version == 4) { $converted_properties[] = 'badge-warning'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-warning text-dark'; }
		            break;
		        case 'badge-important': // not in B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2) { $converted_properties[] = 'badge-important'; }
		            if ($bootstrap_version == 4) { $converted_properties[] = 'badge-danger'; }
		            if ($bootstrap_version == 5) { $converted_properties[] = 'bg-danger'; }
		            break;
		        case 'badge-success': // not in B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2 || $bootstrap_version == 4) { $converted_properties[] = 'badge-success'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-success'; }
		            break;
		        case 'badge-inverse': // no inverse for B3, B4 and B5
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2) { $converted_properties[] = 'badge-inverse'; }
		            break;
		        case 'badge-light': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 4) { $converted_properties[] = 'badge-light'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-light text-dark'; }
		            break;
		        case 'badge-dark': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version == 4) { $converted_properties[] = 'badge-dark'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'bg-dark'; }
		            break;

// alerts

case 'alert': $converted_properties[] = 'alert'; break; // exists for all versions

case 'alert-primary': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'alert-primary'; }
		            break;
		        case 'alert-secondary': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'alert-secondary'; }
		            break;
		        case 'alert-info': $converted_properties[] = 'alert-info'; break;
		        case 'alert-success': $converted_properties[] = 'alert-success'; break;
		        case 'alert-warning': // no B2
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 3) { $converted_properties[] = 'alert-warning'; }
		            break;
		        case 'alert-error':
		        	if ($bootstrap_version == 0 || $bootstrap_version == 2) { $converted_properties[] = 'alert-error'; } else { $converted_properties[] = 'alert-danger'; }
		            break;
		        case 'alert-light': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'alert-light'; }
		            break;
		        case 'alert-dark': // not in B2 nor B3
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'alert-dark'; }
		            break;

// pagination

case 'pagination': $converted_properties[] = 'pagination'; break; // exists for all versions

case 'pagination-large':
		        	if ($bootstrap_version == 2) { $converted_properties[] = 'pagination-large'; } else { $converted_properties[] = 'pagination-lg'; }
		            break;
		        case 'pagination-small':
		        	if ($bootstrap_version == 2) { $converted_properties[] = 'pagination-small'; } else { $converted_properties[] = 'pagination-sm'; }
		            break;
		        case 'pagination-mini':
		        	if ($bootstrap_version == 0) { $converted_properties[] = 'pagination-xs'; }
		        	if ($bootstrap_version == 2) { $converted_properties[] = 'pagination-mini'; }
		        	if ($bootstrap_version >= 3) { $converted_properties[] = 'pagination-sm'; }
		            break;
		        case 'pagination-left': // not in Bootstrap
		        	if ($bootstrap_version == 0) { $converted_properties[] = 'pagination-left'; }
		        	break;
		        case 'pagination-center': // not in B2 nor B3
		        	if ($bootstrap_version == 0) { $converted_properties[] = 'pagination-center'; }
		            if ($bootstrap_version >= 4) { $converted_properties[] = 'justify-content-center'; }
		            break;
		        case 'pagination-right': // not in B2 nor B3
		        	if ($bootstrap_version == 0) { $converted_properties[] = 'pagination-right'; }
		            if ($bootstrap_version >= 4) { $converted_properties[] = 'justify-content-end'; }
		            break;

// align

case 'float-right':
		        	if ($bootstrap_version == 2 || $bootstrap_version == 3) { $converted_properties[] = 'pull-right'; }
		        	if ($bootstrap_version == 0 || $bootstrap_version == 4) { $converted_properties[] = 'float-right'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'float-end'; }
		            break;
		        case 'float-left':
		        	if ($bootstrap_version == 2 || $bootstrap_version == 3) { $converted_properties[] = 'pull-left'; }
		        	if ($bootstrap_version == 0 || $bootstrap_version == 4) { $converted_properties[] = 'float-left'; }
		        	if ($bootstrap_version == 5) { $converted_properties[] = 'float-start'; }
		            break;
		        case 'float-none':
		        	if ($bootstrap_version == 0 || $bootstrap_version >= 4) { $converted_properties[] = 'float-none'; }
		            break;

// clearfix exists for all versions

// visibility

case 'visually-hidden':
		        	switch ($bootstrap_version) {
		        		case 0: case 2: $converted_properties[] = 'element-invisible'; break;
		        		case 3: case 4: $converted_properties[] = 'sr-only'; break;
		        		case 5: $converted_properties[] = 'visually-hidden'; break;
		        	}
		        	break;

// hidden on the phone (for tables)

case 'hidden-phone':
		        	switch ($bootstrap_version) {
		        		case 0: case 2: $converted_properties[] = 'hidden-phone'; break;
		        		case 3: $converted_properties[] = 'hidden-xs'; break;
		        		default: $converted_properties[] = 'd-none d-sm-table-cell'; break;
		        	}
		        	break;
		    }
	    }

return implode(' ', $converted_properties);
	}

/**
	 * output inline svg with reusable sprites and avoid duplicate code
	 *
	 * @param string $spriteId
	 * @param array $svg_attributes
	 * @param array $path_attributes
	 */
	//static function getInlineSVG($spriteName, $path = JURI::root(true).'/media/syw/svg')
	static function getInlineSVG($spriteId, $svg_attributes, $path_attributes)
	{
		$output = '';

if (!isset(self::$SVGSprites['syw_' .$spriteId])) {

$output .= '<svg xmlns="http://www.w3.org/2000/svg" style="display: none;">';

$attributes = '';
			if (isset($svg_attributes['viewbox'])) {
				$attributes .= ' viewBox="' . $svg_attributes['viewbox'] . '"';
			}

$output .= '<symbol id="' . $spriteId . '"' . $attributes . '>';

$attributes = '';
			foreach ($path_attributes as $attribute => $value) {
				$attributes .= ' ' . $attribute . '="' . $value . '"';
			}

$output .= '<path' . $attributes . '></path>';

$output .= '</symbol>';

$output .= '</svg>';

self::$SVGSprites['syw_' .$spriteId] = true;
		}

$attributes = '';
		foreach ($svg_attributes as $attribute => $value) {
			if ($attribute != 'viewbox') {
				$attributes .= ' ' . $attribute . '="' . $value . '"';
			}
		}

$output .= '<svg' . $attributes . '>';

$output .= '<use xlink:href="#' . $spriteId . '" />';

$output .= '</svg>';

return $output;
	}

/**
	 * Output the <picture> or <img> HTML element according to the image source
	 * Follows web standards and ensures proper fallbacks
	 * If the image extension is webp, it adds a png fallback
	 *
	 * @param string $src the image source
	 * @param string $alt the image alt attribute
	 * @param array $attributes attributes to be added to the <img> element (can contain width and height for the image)
	 * @param boolean $lazy_load lazy load the image
	 * @param boolean $high_resolution handle high resolution devices
	 * @param array breakpoints the possible breakpoints to use for media queries (ordered from lower to higher)
	 * @param boolean check the file existence, use when full control over the creation of images
	 * @return string the <picture> or <img> element
	 */
	public static function getImageElement($src, $alt, $attributes = array(), $lazy_load = false, $high_resolution = false, $breakpoints = null, $check_files = true, $version = '')
	{
		$html = '';

$extensions_needing_fallbacks = array('webp', 'avif');
		$mime_types = array('jpg' => 'image/jpeg', 'jpeg' => 'image/jpeg', 'png' => 'image/png', 'gif' => 'image/gif', 'webp' => 'image/webp', 'avif' => 'image/avif');
		$possible_fallback_extensions = array('png', 'jpg');
		
		if ($version) {
		    if (strpos($src, '?') === false) {
		        $version = '?' . $version; // stay homogeneous with the way Joomla adds versions (or use ?version=)
		    } else {
		        $version = '';
		    }
		}
		
// 		$version = '';
// 		$hash = hash_file('md5', JPATH_ROOT . '/' . $src);
// 		if ($hash !== false) {
// 		    $version = '?version=' . $hash;
// 		}

// get the image extension and the image path from $src
		$source_path = JFile::stripExt($src);
		$source_extension = JFile::getExt($src);

if ($lazy_load && isset($attributes['width'])) {
			$attributes['loading'] = 'lazy';
		} else {
			$attributes['loading'] = 'eager';
		}

if (!empty($breakpoints)) {

$html .= '<picture>';

foreach ($breakpoints as $breakpoint) {

$source_highres_breakpoint = false;
				if ($high_resolution) {
					if ($check_files) {
						if (JFile::exists(JPATH_SITE . '/' . $source_path . '_' . $breakpoint . '@2x.' . $source_extension)) {
							$source_highres_breakpoint = true;
						}
					} else {
						$source_highres_breakpoint = true;
					}
				}

$fallback_breakpoint = false;
				$fallback_extension_breakpoint = 'png';
				$fallback_highres_breakpoint = false;

if (in_array($source_extension, $extensions_needing_fallbacks)) {

if ($check_files) {
						foreach ($possible_fallback_extensions as $possible_fallback_extension) {
							if (JFile::exists(JPATH_SITE . '/' . $source_path . '_' . $breakpoint . '.' . $possible_fallback_extension)) {
								$fallback_breakpoint = true;
								$fallback_extension_breakpoint = $possible_fallback_extension;
								if ($high_resolution && JFile::exists(JPATH_SITE . '/' . $source_path . '_' . $breakpoint . '@2x.' . $possible_fallback_extension)) {
									$fallback_highres_breakpoint = true;
								}
								break;
							}
						}
					} else {
						$fallback_breakpoint = true;
						if ($high_resolution) {
							$fallback_highres_breakpoint = true;
						}
					}
				}

$html .= '<source type="' . $mime_types[$source_extension] . '" media="(max-width: ' . $breakpoint . 'px)" srcset="' . $source_path . '_' . $breakpoint . '.' . $source_extension . $version . ($source_highres_breakpoint ? ' 1x,' . $source_path . '_' . $breakpoint . '@2x.' . $source_extension . $version . ' 2x' : '') . '">';
				if ($fallback_breakpoint) {
				    $html .= '<source type="' . $mime_types[$fallback_extension_breakpoint] . '" media="(max-width: ' . $breakpoint . 'px)" srcset="' . $source_path . '_' . $breakpoint . '.' . $fallback_extension_breakpoint . $version . ($fallback_highres_breakpoint ? ' 1x,' . $source_path . '_' . $breakpoint . '@2x.' . $fallback_extension_breakpoint . $version . ' 2x' : '') . '">';
				}
			}

$source_highres = false;
			if ($high_resolution) {
				if ($check_files) {
					if (JFile::exists(JPATH_SITE . '/' . $source_path . '@2x.' . $source_extension)) {
						$source_highres = true;
					}
				} else {
					$source_highres = true;
				}
			}

$fallback = false;
			$fallback_extension = 'png';
			$fallback_highres = false;

if (in_array($source_extension, $extensions_needing_fallbacks)) {

if ($check_files) {
					foreach ($possible_fallback_extensions as $possible_fallback_extension) {
						if (JFile::exists(JPATH_SITE . '/' . $source_path . '.' . $possible_fallback_extension)) {
							$fallback = true;
							$fallback_extension = $possible_fallback_extension;
							if ($high_resolution && JFile::exists(JPATH_SITE . '/' . $source_path . '@2x.' . $possible_fallback_extension)) {
								$fallback_highres = true;
							}
							break;
						}
					}
				} else {
					$fallback = true;
					if ($high_resolution) {
						$fallback_highres = true;
					}
				}
			}

if ($fallback) {
			    $html .= '<source type="' . $mime_types[$source_extension] . '" srcset="' . $src . $version . ($source_highres ? ' 1x,' . $source_path . '@2x.' . $source_extension . $version . ' 2x' : '') . '">';
			}

if ($fallback) {
				if ($fallback_highres) {
				    $attributes['srcset'] = $source_path . '@2x.' . $fallback_extension . $version . ' 2x';
				}
			} else {
				if ($source_highres) {
				    $attributes['srcset'] = $source_path . '@2x.' . $source_extension . $version . ' 2x';
				}
			}

$html .= '<img src="' . ($fallback ? $source_path . '.' . $fallback_extension . $version : $src . $version) . '" alt="' . $alt . '" ' . trim(JArrayHelper::toString($attributes)) . '>';

$html .= '</picture>';

} else {

$fallback = false;
			$fallback_extension = 'png';
			$fallback_highres = false;

if (in_array($source_extension, $extensions_needing_fallbacks)) {

if ($fallback) {
				$html .= '<picture>';
			}

$html .= '<img src="' . ($fallback ? $source_path . '.' . $fallback_extension . $version : $src . $version) . '" alt="' . $alt . '" ' . trim(JArrayHelper::toString($attributes)) . '>';

if ($fallback) {
				$html .= '</picture>';
			}
		}

return $html;
	}

}
?>