/libraries/gantry/core/gantrygzipper.class.php

<?php
/**
 * @package   gantry
 * @subpackage core
 * @version   3.2.22 August 3, 2012
 * @author    RocketTheme http://www.rockettheme.com
 * @copyright Copyright (C) 2007 - 2012 RocketTheme, LLC
 * @license   http://www.gnu.org/licenses/gpl-2.0.html GNU/GPLv2 only
 *
 * Gantry uses the Joomla Framework (http://www.joomla.org), a GNU/GPLv2 content management system
 *
 */
defined('GANTRY_VERSION') or die();

gantry_import('core.gantrysingleton');

/**
 * @package   gantry
 * @subpackage core
 */
class GantryGZipper {
    function process() {

    }

    function processCSSFiles() {
        global $gantry;

        $cache_time = $gantry->get("gzipper-time");
        $expires_time = $gantry->get("gzipper-expirestime", 1440);
        $strip_css = $gantry->get("gzipper-stripwhitespace", 1);

        $grouped_priories = array();
        $output = array();

        foreach ($gantry->_styles as $priorities) {
            foreach ($priorities as $links) {
                $css_links[$links->path] = $links->url;
            }
        }

//		$css_links = $gantry->_styles;

        ksort($gantry->_styles);

        foreach ($gantry->_styles as $style_priority => $styles) {
            $order_keeper = 0;
            $bump_ok = false;
            foreach ($styles as $style_entry) {
                if ($style_entry->type == 'url') {
                    $directory = 'REMOTE_URL';
                    $filename = $style_entry->url;
                    $bump_ok = true;
                }
                else {
                    $directory = dirname($style_entry->path);
                    $filename = basename($style_entry->path);
                }
                $grouped_priories[$style_priority][$order_keeper][$directory][$filename] = $style_entry;
                if ($bump_ok) {
                    $order_keeper++;
                    $bump_ok = false;
                }
            }
        }
        foreach ($grouped_priories as $priority => $order_kept_entries) {
            foreach ($order_kept_entries as $ordered_files) {
                foreach ($ordered_files as $dir => $files) {
                    // Process full urls
                    if ($dir == 'REMOTE_URL') {
                        foreach ($files as $file => $link) {
                            $gantry->document->addStyleSheet($link->url);
                        }
                        continue;
                    }
                    // Process 
                    else {

                        if (!is_writable($dir)) {
                            foreach ($files as $css_file) {
                                $gantry->document->addStyleSheet($css_file->url);
                            }
                            continue;
                        }
                        $md5sum = "";
                        $path = "";

                        jimport('joomla.filesystem.file');

                        //first trip through to build filename
                        foreach ($files as $file => $details) {
                            $md5sum .= md5($details->url);
                            $detailspath = $dir . DS . $file;
                            if (JFile::exists($detailspath)) {
                                $path = dirname($details->url);
                            }
                        }

                        $cache_filename = "css-" . md5($md5sum) . ".php";
                        $cache_fullpath = $dir . DS . $cache_filename;

                        //see if file is stale
                        if (JFile::exists($cache_fullpath)) {
                            $diff = (time() - filectime($cache_fullpath));
                        } else {
                            $diff = $cache_time + 1;
                        }

                        if ($diff > $cache_time) {
                            $outfile = GantryGZipper::_getOutHeader("css", $expires_time);
                            foreach ($files as $file => $details) {
                                $detailspath = $dir . DS . $file;

                                if (JFile::exists($detailspath)) {
                                    $css_content = JFile::read($detailspath);
                                    if ($strip_css) {
                                        $css_content = GantryGZipper::_stripCSSWhiteSpace($css_content);
                                    }
                                    $outfile .= "\n\n/*** " . $file . " ***/\n\n" . $css_content;
                                }
                            }
                            JFile::write($cache_fullpath, $outfile);
                        }

                        $cache_file_name = $path . "/" . $cache_filename;
                        $gantry->document->addStyleSheet($cache_file_name);
                    }
                }
            }
        }
    }

    function processJsFiles() {
        global $gantry;

        $path = $gantry->basePath;
        $cache_time = $gantry->get("gzipper-time");
        $expires_time = $gantry->get("gzipper-expirestime", 1440);


        $ordered_files = array();
        $output = array();
        $md5sum = "";

        $script_tags = $gantry->_scripts;

        foreach ($script_tags as $filepath => $file) {
            $md5sum .= md5($filepath);
            $ordered_files[] = array(dirname($filepath), basename($filepath), $file);
        }

        if (!is_writable(JPATH_CACHE)) {
            foreach ($this->_scripts as $js_file) {
                $gantry->document->addScript($js_file);
            }
            return;
        }

        if (count($ordered_files) > 0) {
            $cache_filename = "js-" . md5($md5sum) . ".php";
            $cache_fullpath = JPATH_CACHE . DS . $cache_filename;


            //see if file is stale
            if (JFile::exists($cache_fullpath)) {
                $diff = (time() - filectime($cache_fullpath));
            } else {
                $diff = $cache_time + 1;
            }

            if ($diff > $cache_time) {
                $outfile = GantryGZipper::_getOutHeader("js", $expires_time);
                foreach ($ordered_files as $files) {
                    $dir = $files[0];
                    $filename = $files[1];
                    $details = $files[2];

                    $detailspath = $dir . DS . $filename;
                    if (JFile::exists($detailspath)) {
                        $jsfile = JFile::read($detailspath);
                        // fix for stupid joolma code
                        if (strpos($filename, 'joomla.javascript.js')!==false or strpos($filename, 'mambojavascript.js')!==false) {
                            $jsfile = str_replace("// <?php !!", "// ", $jsfile);
                        }
                        $jsfile = self::cleanEndLines($jsfile);
                        $outfile .= "\n\n/*** " . $filename . " ***/\n\n" . $jsfile;

                    }
                }
                JFile::write($cache_fullpath, $outfile);
            }

            $cache_file_name = $path . "/cache/" . $cache_filename;
            $cache_url_name = $gantry->baseUrl . "cache/" . $cache_filename;
            $gantry->document->addScript($cache_url_name);
        }
    }

    function cleanEndLines($data){
        $file_lines = explode("\n",$data);
        while (($line = array_pop($file_lines)) != null){
            $clean_line = rtrim($line);
            if (strlen($clean_line) > 0){
                $end_char = substr($line, strlen($clean_line), 1);
                array_push($file_lines,$line);
                if ($end_char != ';'){
                    array_push($file_lines, ";");
                }
                break;
            }
        }
        return implode($file_lines,"\n");
    }



    function _getOutHeader($type = "css", $expires_time = 1440) {
        if ($type == "css") {
            $header = '<?php
ob_start ("ob_gzhandler");
header("Content-type: text/css; charset: UTF-8");
header("Cache-Control: must-revalidate");
$expires_time = ' . $expires_time . ';
$offset = 60 * $expires_time ;
$ExpStr = "Expires: " .
gmdate("D, d M Y H:i:s",
time() + $offset) . " GMT";
header($ExpStr);
                ?>';
        } else {
            $header = '<?php
ob_start ("ob_gzhandler");
header("Content-type: application/x-javascript; charset: UTF-8");
header("Cache-Control: must-revalidate");
$expires_time = ' . $expires_time . ';
$offset = 60 * $expires_time ;
$ExpStr = "Expires: " .
gmdate("D, d M Y H:i:s",
time() + $offset) . " GMT";
header($ExpStr);
                ?>';
        }
        return $header;
    }

    function _stripCSSWhiteSpace($css_content) {
        // remove comments
        $css_content = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $css_content);
        // remove tabs, spaces, newlines, etc.
        $css_content = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $css_content);
        return $css_content;
    }
}