Add CSS icon classes to post-class object by post_type and post-format

cbstdsys_add-icon-classes-to-post-classes-obj.php

function cbstdsys_add_icon_classes_by_post_type_and_format( $classes ) {
    global $post;
    
    switch ( $post->post_type ) {
    
    	case 'post' :
			if ( is_sticky( $post->ID ) ) {
				$classes[] = 'icon-alert';
				return $classes;
			}

			$format = get_post_format();
		    if ( false === $format )
		        $format = 'standard';
    		
    		switch ( $format ) {
    			
    			case 'standard' :
    				$classes[] = 'icon-doc-text';
    				return $classes;
    			case 'video' :
    				$classes[] = 'icon-videocam';
    				return $classes;
    			case 'gallery' :
    				$classes[] = 'icon-camera-alt';
    				return $classes;    				
    			case 'quote' :
    				$classes[] = 'icon-quote-right';
    				return $classes;
    			case 'aside' :
    				$classes[] = 'icon-attach';
    				return $classes;
    			case 'link' :
    				$classes[] = 'icon-link'; 
    				return $classes;
    			case 'image' :
    				$classes[] = 'icon-picture'; 
    				return $classes; 
    			case 'chat' :
    				$classes[] = 'icon-chat'; 
    				return $classes;    				   				    				 
    			case 'status' :
    				$classes[] = 'icon-comment'; 
    				return $classes; 
    			case 'audio' :
    				$classes[] = 'icon-note'; 
    				return $classes; 
    		}
		case 'page' :
			$classes[] = 'icon-doc-text-inv'; 
			return $classes;
		case 'staging' :
			$classes[] = 'icon-feather';
			return $classes; 			
		case 'event' :
			$classes[] = 'icon-clock';
			return $classes;
    }
    return $classes;
}
add_filter( 'post_class', 'im_add_icon_classes_by_post_type_and_format' );