add piwik installation

www/analytics/core/AssetManager/UIAssetMerger.php

@@ -0,0 +1,209 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik\AssetManager;
+
+use Piwik\AssetManager\PiwikLessCompiler;
+use Piwik\AssetManager\UIAsset\StylesheetUIAsset;
+use Piwik\AssetManager;
+
+abstract class UIAssetMerger
+{
+    /**
+     * @var UIAssetFetcher
+     */
+    private $assetFetcher;
+
+    /**
+     * @var UIAsset
+     */
+    private $mergedAsset;
+
+    /**
+     * @var string
+     */
+    private $mergedContent;
+
+    /**
+     * @var UIAssetCacheBuster
+     */
+    protected $cacheBuster;
+
+    /**
+     * @param UIAsset $mergedAsset
+     * @param UIAssetFetcher $assetFetcher
+     * @param UIAssetCacheBuster $cacheBuster
+     */
+    function __construct($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;
+    }
+
+    private 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;
+    }
+
+    /**
+     * @return boolean
+     */
+    private function isMergedAssetsDisabled()
+    {
+        return AssetManager::getInstance()->isMergedAssetsDisabled();
+    }
+
+    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;
+    }
+
+    /**
+     * @return boolean
+     */
+    private function shouldCompareExistingVersion()
+    {
+        return $this->isMergedAssetsDisabled();
+    }
+}