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<?php
use JchOptimize\CssSpriteGen;
/**
* JCH Optimize - Aggregate and minify external resources for optmized downloads
*
* @author Samuel Marshall <sdmarshall73@gmail.com>
* @copyright Copyright (c) 2010 Samuel Marshall
* @license GNU/GPLv3, See LICENSE file
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* If LICENSE file missing, see <http://www.gnu.org/licenses/>.
*/
defined('_JCH_EXEC') or die('Restricted access');
class JchOptimizeSpriteGenerator
{
public $params = null;
/**
* Constructor
*
* @param type $params
*/
public function __construct($params)
{
$this->params = $params;
}
/**
*
* @return string|boolean
*/
public function getImageLibrary()
{
if(!extension_loaded('exif'))
{
JchOptimizeLogger::log('EXIF extension not loaded', $this->params);
return FALSE;
}
if (extension_loaded('imagick'))
{
$sImageLibrary = 'imagick';
}
else
{
if (!extension_loaded('gd'))
{
JchOptimizeLogger::log('No image manipulation library installed', $this->params);
return FALSE;
}
$sImageLibrary = 'gd';
}
return $sImageLibrary;
}
/**
* Grabs background images with no-repeat attribute from css and merge them in one file called a sprite.
* Css is updated with sprite url and correct background positions for affected images.
* Sprite saved in {Joomla! base}/images/jch-optimize/
*
* @param string $sCss Aggregated css file before sprite generation
* @return string Css updated with sprite information on success. Original css on failure
*/
public function getSprite($sCss)
{
$sImageLibrary = $this->getImageLibrary();
$aMatches = $this->processCssUrls($sCss);
if (empty($aMatches) || $sImageLibrary === FALSE)
{
return $sCss;
}
$this->params->set('sprite-path', JchPlatformPaths::spriteDir());
$aSearch = $this->generateSprite($aMatches, new CssSpriteGen($sImageLibrary, $this->params));
return $aSearch;
}
/**
* Generates sprite image and return background positions for image replaced with sprite
*
* @param array $aMatches Array of css declarations and image url to be included in sprite
* @param object $oSpriteGen Object of sprite generator
* @return array
*/
public function generateSprite($aMatches, $oSpriteGen)
{
JCH_DEBUG ? JchPlatformProfiler::start('GenerateSprite') : null;
$aDeclaration = $aMatches[0];
$aImages = $aMatches[1];
$oSpriteGen->CreateSprite($aImages);
$aSpriteCss = $oSpriteGen->GetCssBackground();
$aPatterns = array();
$aPatterns[0] = '#background-image:#'; // Background image declaration regex
$aPatterns[1] = '#(background:[^;}]*)\b' //Background position regex
. '((?:top|bottom|left|right|center|-?[0-9]+(?:%|[c-x]{2})?)'
. '\s(?:top|bottom|left|right|center|-?[0-9]+(?:%|[c-x]{2})?))([^;}]*[;}])#';
$aPatterns[2] = '#url\((?=[^\)]+\.(?:png|gif|jpe?g))[^\)]+\)#'; //Background image regex
$aPatterns[3] = '#background-position:[^;}]+;?#'; //Background position declaration regex
$sSpriteName = $oSpriteGen->GetSpriteFilename();
$aSearch = array();
$aStaticFiles = $this->params->get('pro_staticfiles', array('css','js','jpe?g','gif','png','ico','bmp','pdf'));
$cdn = in_array('png', $aStaticFiles) ? JchOptimizeHelper::cookieLessDomain($this->params) : '';
$spritepath = $cdn . JchPlatformPaths::spriteDir(TRUE) . $sSpriteName;
for ($i = 0; $i < count($aSpriteCss); $i++)
{
if (isset($aSpriteCss[$i]))
{
$aSearch['needles'][] = $aDeclaration[$i];
$aReplacements = array();
$aReplacements[0] = 'background:';
$aReplacements[1] = '$1$3';
$aReplacements[2] = 'url(' . $spritepath . ') ' . $aSpriteCss[$i];
$aReplacements[3] = '';
$sReplacement = preg_replace($aPatterns, $aReplacements, $aDeclaration[$i]);
if (is_null($sReplacement))
{
throw new Exception('Error finding replacements for sprite background positions');
}
$aSearch['replacements'][] = $sReplacement;
}
}
JCH_DEBUG ? JchPlatformProfiler::stop('GenerateSprite', TRUE) : null;
return $aSearch;
}
/**
* Uses regex to find css declarations containing background images to include in sprite
*
* @param string $sCss Aggregated css file
* @return array Array of css declarations and image urls to replace with sprite
*/
public function processCssUrls($sCss, $bBackend = FALSE)
{
JCH_DEBUG ? JchPlatformProfiler::start('ProcessCssUrls') : null;
$params = $this->params;
$aRegexStart = array();
$aRegexStart[0] = '
#(?:{
(?=\s*+(?>[^}\s:]++[\s:]++)*?url\(
(?=[^)]+\.(?:png|gif|jpe?g))
([^)]+)\))';
$aRegexStart[1] = '
(?=\s*+(?>[^}\s:]++[\s:]++)*?no-repeat)';
$aRegexStart[2] = '
(?(?=\s*(?>[^};]++[;\s]++)*?background(?:-position)?\s*+:\s*+(?:[^;}\s]++[^}\S]++)*?
(?<p>(?:[tblrc](?:op|ottom|eft|ight|enter)|-?[0-9]+(?:%|[c-x]{2})?))(?:\s+(?&p))?)
(?=\s*(?>[^};]++[;\s]++)*?background(?:-position)?\s*+:\s*+(?>[^;}\s]++[\s]++)*?
(?:left|top|0(?:%|[c-x]{2})?)\s+(?:left|top|0(?:%|[c-x]{2})?)
)
)';
$sRegexMiddle = '
[^{}]++} )';
$sRegexEnd = '#isx';
$aIncludeImages = JchOptimizeHelper::getArray($params->get('csg_include_images'));
$aExcludeImages = JchOptimizeHelper::getArray($params->get('csg_exclude_images'));
$sIncImagesRegex = '';
if (!empty($aIncludeImages[0]))
{
foreach ($aIncludeImages as &$sImage)
{
$sImage = preg_quote($sImage, '#');
}
$sIncImagesRegex .= '
|(?:{
(?=\s*+(?>[^}\s:]++[\s:]++)*?url';
$sIncImagesRegex .= ' (?=[^)]* [/(](?:' . implode('|', $aIncludeImages) . ')\))';
$sIncImagesRegex .= '\(([^)]+)\)
)
[^{}]++ })';
}
$sExImagesRegex = '';
if (!empty($aExcludeImages[0]))
{
$sExImagesRegex .= '(?=\s*+(?>[^}\s:]++[\s:]++)*?url\(
[^)]++ (?<!';
foreach ($aExcludeImages as &$sImage)
{
$sImage = preg_quote($sImage, '#');
}
$sExImagesRegex .= implode('|', $aExcludeImages) . ')\)
)';
}
$sRegexStart = implode('', $aRegexStart);
$sRegex = $sRegexStart . $sExImagesRegex . $sRegexMiddle . $sIncImagesRegex . $sRegexEnd;
if (preg_match_all($sRegex, $sCss, $aMatches) === FALSE)
{
throw new Exception('Error occurred matching for images to sprite');
}
if (isset($aMatches[3]))
{
$total = count($aMatches[1]);
for($i = 0; $i < $total; $i++)
{
$aMatches[1][$i] = trim($aMatches[1][$i])? $aMatches[1][$i] : $aMatches[3][$i];
}
}
if ($bBackend)
{
$aImages = array();
$aImagesMatches = array();
$aImgRegex = array();
$aImgRegex[0] = $aRegexStart[0];
$aImgRegex[2] = $aRegexStart[1];
$aImgRegex[4] = $sRegexMiddle;
$aImgRegex[5] = $sRegexEnd;
$sImgRegex = implode('', $aImgRegex);
if (preg_match_all($sImgRegex, $sCss, $aImagesMatches) === FALSE)
{
throw new Exception('Error occurred matching for images to include');
}
$aImagesMatches[0] = array_diff($aImagesMatches[0], $aMatches[0]);
$aImagesMatches[1] = array_diff($aImagesMatches[1], $aMatches[1]);
$oImageLibrary = $this->getImageLibrary();
if($oImageLibrary === FALSE)
{
return array();
}
$oCssSpriteGen = new CssSpriteGen($oImageLibrary, $this->params, $bBackend);
$aImages['include'] = $oCssSpriteGen->CreateSprite($aImagesMatches[1]);
$aImages['exclude'] = $oCssSpriteGen->CreateSprite($aMatches[1]);
return $aImages;
}
JCH_DEBUG ? JchPlatformProfiler::stop('ProcessCssUrls', TRUE) : null;
return $aMatches;
}
}