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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\AssetManager\UIAssetMerger;
use Exception;
use lessc;
use Piwik\AssetManager\UIAsset;
use Piwik\AssetManager\UIAssetMerger;
use Piwik\Piwik;
class StylesheetUIAssetMerger extends UIAssetMerger
{
/**
* @var lessc
*/
private $lessCompiler;
function __construct($mergedAsset, $assetFetcher, $cacheBuster)
{
parent::__construct($mergedAsset, $assetFetcher, $cacheBuster);
$this->lessCompiler = self::getLessCompiler();
}
protected function getMergedAssets()
{
// note: we're using setImportDir on purpose (not addImportDir)
$this->lessCompiler->setImportDir(PIWIK_USER_PATH);
$concatenatedAssets = $this->getConcatenatedAssets();
return $this->lessCompiler->compile($concatenatedAssets);
}
/**
* @return lessc
* @throws Exception
*/
private static function getLessCompiler()
{
if (!class_exists("lessc")) {
throw new Exception("Less was added to composer during 2.0. ==> Execute this command to update composer packages: \$ php composer.phar install");
}
$less = new lessc();
return $less;
}
protected function generateCacheBuster()
{
$fileHash = $this->cacheBuster->md5BasedCacheBuster($this->getConcatenatedAssets());
return "/* compile_me_once=$fileHash */";
}
protected function getPreamble()
{
return $this->getCacheBusterValue() . "\n"
. "/* Piwik CSS file is compiled with Less. You may be interested in writing a custom Theme for Piwik! */\n";
}
protected function postEvent(&$mergedContent)
{
/**
* Triggered after all less stylesheets are compiled to CSS, minified and merged into
* one file, but before the generated CSS is written to disk.
*
* This event can be used to modify merged CSS.
*
* @param string $mergedContent The merged and minified CSS.
*/
Piwik::postEvent('AssetManager.filterMergedStylesheets', array(&$mergedContent));
}
public function getFileSeparator()
{
return '';
}
protected function processFileContent($uiAsset)
{
$pathsRewriter = $this->getCssPathsRewriter($uiAsset);
$content = $uiAsset->getContent();
$content = $this->rewriteCssImagePaths($content, $pathsRewriter);
$content = $this->rewriteCssImportPaths($content, $pathsRewriter);
return $content;
}
/**
* Rewrite CSS url() directives
*
* @param string $content
* @param function $pathsRewriter
* @return string
*/
private function rewriteCssImagePaths($content, $pathsRewriter)
{
$content = preg_replace_callback( "/(url\(['\"]?)([^'\")]*)/", $pathsRewriter, $content );
return $content;
}
/**
* Rewrite CSS import directives
*
* @param string $content
* @param function $pathsRewriter
* @return string
*/
private function rewriteCssImportPaths($content, $pathsRewriter)
{
$content = preg_replace_callback( "/(@import \")([^\")]*)/", $pathsRewriter, $content );
return $content;
}
/**
* Rewrite CSS url directives
* - rewrites paths defined relatively to their css/less definition file
* - rewrite windows directory separator \\ to /
*
* @param string $baseDirectory
* @return \Closure
*/
private function getCssPathsRewriter($uiAsset)
{
$baseDirectory = dirname($uiAsset->getRelativeLocation());
return function ($matches) use ($baseDirectory) {
$absolutePath = PIWIK_USER_PATH . "/$baseDirectory/" . $matches[2];
// Allow to import extension less file
if (strpos($matches[2], '.') === false) {
$absolutePath .= '.less';
}
// Prevent from rewriting full path
$absolutePath = realpath($absolutePath);
if ($absolutePath) {
$relativePath = $baseDirectory . "/" . $matches[2];
$relativePath = str_replace('\\', '/', $relativePath);
$publicPath = $matches[1] . $relativePath;
} else {
$publicPath = $matches[1] . $matches[2];
}
return $publicPath;
};
}
/**
* @param UIAsset $uiAsset
* @return int
*/
protected function countDirectoriesInPathToRoot($uiAsset)
{
$rootDirectory = realpath($uiAsset->getBaseDirectory());
if ($rootDirectory != PATH_SEPARATOR
&& substr($rootDirectory, -strlen(PATH_SEPARATOR)) !== PATH_SEPARATOR) {
$rootDirectory .= PATH_SEPARATOR;
}
$rootDirectoryLen = strlen($rootDirectory);
return $rootDirectoryLen;
}
}
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