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matomo / core /AssetManager /UIAssetMerger.php
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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*/
namespace Piwik\AssetManager;
abstract class UIAssetMerger
{
/**
* @var UIAssetFetcher
*/
private $assetFetcher;
/**
* @var UIAsset
*/
private $mergedAsset;
/**
* @var string
*/
protected $mergedContent;
/**
* @var UIAssetCacheBuster
*/
protected $cacheBuster;
/**
* @var string
*/
protected $cacheBusterValue;
/**
* @param UIAsset $mergedAsset
* @param UIAssetFetcher $assetFetcher
* @param UIAssetCacheBuster $cacheBuster
*/
public function __construct($mergedAsset, $assetFetcher, $cacheBuster)
{
$this->mergedAsset = $mergedAsset;
$this->assetFetcher = $assetFetcher;
$this->cacheBuster = $cacheBuster;
}
public function generateFile()
{
if (!$this->shouldGenerate()) {
return;
}
$this->mergedContent = $this->getMergedAssets();
$this->postEvent($this->mergedContent);
$this->adjustPaths();
$this->addPreamble();
$this->writeContentToFile();
}
/**
* @return string
*/
abstract protected function getMergedAssets();
/**
* @return string
*/
abstract protected function generateCacheBuster();
/**
* @return string
*/
abstract protected function getPreamble();
/**
* @return string
*/
abstract protected function getFileSeparator();
/**
* @param UIAsset $uiAsset
* @return string
*/
abstract protected function processFileContent($uiAsset);
/**
* @param string $mergedContent
*/
abstract protected function postEvent(&$mergedContent);
protected function getConcatenatedAssets()
{
if (empty($this->mergedContent)) {
$this->concatenateAssets();
}
return $this->mergedContent;
}
protected function concatenateAssets()
{
$mergedContent = '';
foreach ($this->getAssetCatalog()->getAssets() as $uiAsset) {
$uiAsset->validateFile();
$content = $this->processFileContent($uiAsset);
$mergedContent .= $this->getFileSeparator() . $content;
}
$this->mergedContent = $mergedContent;
}
/**
* @return string[]
*/
protected function getPlugins()
{
return $this->assetFetcher->getPlugins();
}
/**
* @return UIAssetCatalog
*/
protected function getAssetCatalog()
{
return $this->assetFetcher->getCatalog();
}
/**
* @return boolean
*/
private function shouldGenerate()
{
if (!$this->mergedAsset->exists()) {
return true;
}
return !$this->isFileUpToDate();
}
/**
* @return boolean
*/
private function isFileUpToDate()
{
$f = fopen($this->mergedAsset->getAbsoluteLocation(), 'r');
$firstLine = fgets($f);
fclose($f);
if (!empty($firstLine) && trim($firstLine) == trim($this->getCacheBusterValue())) {
return true;
}
// Some CSS file in the merge, has changed since last merged asset was generated
// Note: we do not detect changes in @import'ed LESS files
return false;
}
private function adjustPaths()
{
$theme = $this->assetFetcher->getTheme();
// During installation theme is not yet ready
if ($theme) {
$this->mergedContent = $this->assetFetcher->getTheme()->rewriteAssetsPathToTheme($this->mergedContent);
}
}
private function writeContentToFile()
{
$this->mergedAsset->writeContent($this->mergedContent);
}
/**
* @return string
*/
protected function getCacheBusterValue()
{
if (empty($this->cacheBusterValue)) {
$this->cacheBusterValue = $this->generateCacheBuster();
}
return $this->cacheBusterValue;
}
private function addPreamble()
{
$this->mergedContent = $this->getPreamble() . $this->mergedContent;
}
}