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<?php
/**
* @version $Id$
* @package JSNExtension
* @subpackage TPLFramework
* @author JoomlaShine Team <support@joomlashine.com>
* @copyright Copyright (C) 2012 JoomlaShine.com. All Rights Reserved.
* @license GNU/GPL v2 or later http://www.gnu.org/licenses/gpl-2.0.html
*
* Websites: http://www.joomlashine.com
* Technical Support: Feedback - http://www.joomlashine.com/contact-us/get-support.html
*/
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
// Import necessary Joomla libraries
jimport('joomla.filesystem.folder');
jimport('joomla.filesystem.file');
/**
* CSS Compression engine
*
* @package TPLFramework
* @subpackage Plugin
* @since 1.0.0
*/
abstract class JSNTplCompressCss
{
/**
* Method to parse all link to css files from the html markup
* and compress it
*
* @param string $htmlMarkup HTML Content to response to browser
*
* @return void
*/
public static function compress ($htmlMarkup)
{
static $compressedFiles;
// Get object for working with URI
$uri = JUri::getInstance();
// Generate link prefix if current scheme is HTTPS
$prefix = '';
if ($uri->getScheme() == 'https')
{
$prefix = $uri->toString(array('scheme', 'host', 'port'));
}
// Initialize variables
$groupIndex = 0;
$groupType = 'screen';
$groupFiles = array();
$compress = array();
// Sometime, stylesheet file need to be stored in the original location and file name
$document = JFactory::getDocument();
$leaveAlone = preg_split('/[\r\n]+/', $document->params->get('compressionExclude'));
// We already know that the file galleria.classic.css must be excluded
$leaveAlone[] = 'galleria.classic.css';
// Parse link tags
foreach (explode('>', $htmlMarkup[0]) AS $line)
{
$attributes = JSNTplCompressHelper::parseAttributes($line);
// Set default media attribute
$attributes['media'] = ! isset($attributes['media']) ? '' : strtolower($attributes['media']);
// Skip if not have attibute href
if ( ! isset($attributes['href']))
{
continue;
}
// Add to result list if this is external file
if ( ! ($isInternal = JUri::isInternal($attributes['href'])) OR strpos($attributes['href'], '//') === 0)
{
$compress[] = array(
'href' => $attributes['href'],
'media' => $attributes['media']
);
continue;
}
// Add to result list if this is dynamic generation content
$questionPos = false;
if (($questionPos = strpos($attributes['href'], '?')) !== false)
{
$isDynamic = (substr($attributes['href'], $questionPos - 4, 4) == '.php');
$path = JSNTplCompressHelper::getFilePath(substr($attributes['href'], 0, $questionPos));
// Check if this is a dynamic generation content
if ( ! $isDynamic AND $isInternal)
{
$isDynamic = ! is_file($path);
}
if ($isDynamic)
{
$compress[] = array(
'href' => $attributes['href'],
'media' => $attributes['media']
);
continue;
}
}
// Check if reserving stylesheet file name is required
$stylesheetName = basename($questionPos !== false ? $path : $attributes['href']);
if (in_array($stylesheetName, $leaveAlone))
{
$attributes['media'] .= '|reserve|' . $stylesheetName;
}
// Create new compression group when media attribute different with group type
if ($attributes['media'] != $groupType)
{
// Add collected files to compress list
if (isset($groupFiles[$groupIndex]) AND ! empty($groupFiles[$groupIndex]))
{
$compress[] = array(
'files' => $groupFiles[$groupIndex],
'media' => $groupType
);
}
// Increase index number of the group
$groupIndex++;
$groupType = $attributes['media'];
}
// Initial group
if ( ! isset($groupFiles[$groupIndex]))
{
$groupFiles[$groupIndex] = array();
}
$href = $attributes['href'];
$queryStringIndex = strpos($href, '?');
if ($queryStringIndex !== false)
{
$href = substr($href, 0, $queryStringIndex);
}
// Add file to the group
$groupFiles[$groupIndex][] = preg_match('/^([^\|]*)\|reserve\|.+$/', $groupType) ? $attributes['href'] : $href;
}
// Add collected files to result list
if (isset($groupFiles[$groupIndex]) AND ! empty($groupFiles[$groupIndex]))
{
$compress[] = array(
'files' => $groupFiles[$groupIndex],
'media' => $groupType
);
}
// Initial compress result
$compressResult = array();
// Get template details
$templateName = JFactory::getApplication()->getTemplate();
// Generate path to cache directory
if ( ! preg_match('#^(/|\\|[a-z]:)#i', $document->params->get('cacheDirectory')))
{
$compressPath = JPATH_ROOT . '/' . rtrim($document->params->get('cacheDirectory'), '\\/');
}
else
{
$compressPath = rtrim($document->params->get('cacheDirectory'), '\\/');
}
$compressPath = $compressPath . '/' . $templateName . '/';
// Create directory if not exists
if ( ! is_dir($compressPath))
{
JFolder::create($compressPath);
}
// Loop to each compress element to compress file
foreach ($compress AS $group)
{
// Ignore compress when group is a external file
if (isset($group['href']))
{
$link = '<link rel="stylesheet" href="' . $group['href'] . '" ';
if (isset($group['media']) AND ! empty($group['media']))
{
$link .= 'media="' . $group['media'] . '" ';
}
$link .= '/>';
$compressResult[] = $link;
continue;
}
// Check if reserving stylesheet file name is required
if (isset($group['media']) AND preg_match('/^([^\|]*)\|reserve\|.+$/', $group['media'], $m))
{
$link = '<link rel="stylesheet" href="' . $group['files'][0] . '" ';
if (isset($m[1]) AND ! empty($m[1]))
{
$link .= 'media="' . $m[1] . '" ';
}
$link .= '/>';
$compressResult[] = $link;
continue;
}
// Generate compress file name
$compressFile = md5(implode('', $group['files'])) . '.css';
$lastModified = 0;
// Check last modified time for each file in the group
foreach ($group['files'] AS $file)
{
$path = JSNTplCompressHelper::getFilePath($file);
$lastModified = (is_file($path) && filemtime($path) > $lastModified) ? filemtime($path) : $lastModified;
}
// Compress group when expired
if ( ! is_file($compressPath . $compressFile) OR filemtime($compressPath . $compressFile) < $lastModified)
{
// Preset compression buffer
$buffer = '';
// Preset remote file array
$remoteFiles = array();
// Preset some variables to hold compression status
$processedFiles = array();
$maxFileSize = 1024 * (int) $document->params->get('maxCompressionSize');
$currentSize = 0;
// Read content of each file and write it to the cache file
foreach ($group['files'] AS $file)
{
$filePath = JSNTplCompressHelper::getFilePath($file);
// Skip when cannot access to file
if ( ! is_file($filePath) OR ! is_readable($filePath))
{
continue;
}
// Do compression
$result = trim(self::_loadFileInto($buffer, $filePath, $maxFileSize, $currentSize, $remoteFiles));
if (empty($result))
{
// Store processed file
$processedFiles[] = $filePath;
}
else
{
// Write buffer to cache file
JFile::write($compressPath . $compressFile, $buffer);
// Rename created cache file
$newFileName = md5(implode('', $processedFiles)) . '.css';
JFile::move($compressPath . $compressFile, $compressPath . $newFileName);
// Save every compressed file associated with this page for maintenance later
$compressedFiles[] = str_replace('\\', '/', $compressPath) . $newFileName;
// Add compressed file to the remote file import list
$remoteFiles[] = str_replace(str_replace('\\', '/', JPATH_ROOT), JUri::root(true), str_replace('\\', '/', $compressPath)) . $newFileName;
// Reset compression buffer
$buffer = $result;
// Reset compression status variables
$currentSize = strlen($result);
$processedFiles = array($filePath);
}
}
// Write buffer to cache file
JFile::write($compressPath . $compressFile, $buffer);
// Save every compressed file associated with this page for maintenance later
$compressedFiles[] = str_replace('\\', '/', $compressPath) . $compressFile;
if ( ! empty($remoteFiles))
{
for ($n = count($remoteFiles), $i = $n - 1; $i >= 0; $i--)
{
JSNTplCompressHelper::prependIntoFile("@import url({$remoteFiles[$i]});" . ($i + 1 < $n ? "\n" : "\n\n"), $compressPath . $compressFile);
}
}
}
// Add compressed file to the compress result list
$compressUrl = str_replace(str_replace('\\', '/', JPATH_ROOT), JUri::root(true), str_replace('\\', '/', $compressPath)) . $compressFile;
$link = '<link rel="stylesheet" href="' . $prefix . $compressUrl . '" ';
if (isset($group['media']) AND ! empty($group['media']))
{
$link .= 'media="' . preg_replace('/\|reserve\|(.+)$/', '', $group['media']) . '" ';
}
$link .= '/>';
$compressResult[] = $link;
}
// Verify if stylesheets associated with this page has been changed
if (isset($compressedFiles))
{
$trackFile = $compressPath . 'tracking.php';
$pageLink = JUri::current();
$cleanUp = array();
if (file_exists($trackFile))
{
if ( ! file_exists("{$trackFile}.lock"))
{
// Get tracking data
include $trackFile;
if (isset($tracking) && isset($tracking[$pageLink]) && isset($tracking[$pageLink]['css']))
{
foreach ($tracking[$pageLink]['css'] as $file)
{
if ( ! in_array($file, $compressedFiles))
{
// Store obsolete file to be removed
$cleanUp[] = $file;
}
}
// Remove obsolete file only if not used in another page
foreach ($cleanUp as $file)
{
$removable = true;
foreach ($tracking as $link => $assets)
{
if ($pageLink == $link)
{
continue;
}
if (in_array($file, $assets['css']))
{
$removable = false;
break;
}
}
if ($removable)
{
JFile::delete($file);
}
}
}
}
}
else
{
// Clean all unmaintained compressed files
if ($files = glob($compressPath . '*.css'))
{
foreach ($files as $file)
{
$file = str_replace('\\', '/', $file);
if ( ! in_array($file, $compressedFiles))
{
JFile::delete($file);
}
}
}
}
// Update tracking file if not locked
if ( ! file_exists("{$trackFile}.lock"))
{
// Create lock file
$content = 'Updating';
JFile::write("{$trackFile}.lock", $content);
// Preset tracking array
if ( ! isset($tracking))
{
$tracking = array($pageLink => array());
}
$tracking[$pageLink]['css'] = $compressedFiles;
// Update tracking data
$content = "<?php\n\$tracking = json_decode('" . json_encode($tracking) . "', true);\n?>";
// Update tracking file
JFile::write($trackFile, $content);
// Remove lock file
JFile::delete("{$trackFile}.lock");
}
}
return implode("\r\n", $compressResult);
}
/**
* Load content from a file and append into existing opened file
*
* @param string &$buffer Compression buffer.
* @param string $sourcePath Path to source file.
* @param integer $maxFileSize Maximum allowed file size.
* @param integer &$currentFileSize Current file size.
* @param array &$remoteFilesImport Array of remotely imported file.
*
* @return mixed Compressed content if max file size is reached.
*/
private static function _loadFileInto(&$buffer, $sourcePath, $maxFileSize, &$currentFileSize, &$remoteFilesImport)
{
// Read source file
$source = JFile::read($sourcePath);
// Rewrite all relative URLs
if (preg_match_all('/(@import\s+|[^:,;\}\r\n]*)([^,;\}\r\n]*)url\s*\(([^\)]+)\)([^,;\}\r\n]*[,;\}])/i', $source, $matches, PREG_SET_ORDER))
{
foreach ($matches AS $match)
{
$fileUrl = JSNTplCompressHelper::getRelativeFilePath(dirname($sourcePath), trim($match[3], '"\''));
if (trim($match[1]) != '@import')
{
$fileUrl = ltrim(str_replace('\\', '/', $fileUrl), '/');
if (strpos($match[3], '://') === false && strpos($match[3], '//') !== 0)
{
$source = str_replace($match[0], $match[1] . $match[2] . 'url(/' . $fileUrl . ')' . $match[4], $source);
}
}
elseif ( ! preg_match('#^https?://#', $match[3]))
{
// Get file path
$filePath = getenv('DOCUMENT_ROOT') . $fileUrl;
// Compress file being imported
$imports[] = self::_loadFileInto($buffer, $filePath, $maxFileSize, $currentFileSize, $remoteFilesImport);
// Remove @import file inclusion for local file
$source = str_replace($match[0], '', $source);
}
else
{
// Store @import file inclusion for remote file
$remoteFilesImport[] = $match[3];
}
}
}
// Strip all tab, return and new-line characters
$source = preg_replace('/[\t\r\n]/', '', $source);
// Prepend path to source file
$source = ($currentFileSize == 0 ? '' : "\n\n")
. '/* FILE: ' . str_replace(str_replace('\\', '/', JPATH_ROOT), '', str_replace('\\', '/', $sourcePath)) . ' */'
. "\n{$source}";
// Get length of processed content
$length = strlen($source);
// Update current file size
$currentFileSize += $length;
// Check if max file size is reached
if ($length > $maxFileSize OR $currentFileSize > $maxFileSize)
{
return (isset($imports) ? implode($imports) : '') . $source;
}
// Append processed content to buffer
$buffer .= $source;
return '';
}
}
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