<?php
namespace App\Http\Middleware;
use Closure;
class RemoveExcessWhitespaceMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $response = $next($request);
        $output = $response->getOriginalContent();

        $filters = array(
            '/<!--([^\[|(<!)].*)/'		=> '', // Remove HTML Comments (breaks with HTML5 Boilerplate)
            '/(?<!\S)\/\/\s*[^\r\n]*/'	=> '', // Remove comments in the form /* */
            '/\s{2,}/'			=> ' ', // Shorten multiple white spaces
            '/(\r?\n)/'			=> '', // Collapse new lines
            '/(\>)\s*(\<)/m'                => '$1$2', // Trim Final Whitespace from between html tags
        );
        $output = preg_replace(array_keys($filters), array_values($filters), $output);
        $response->setContent($output);
        return $response;
    }
}