Cache and compile base

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

lib/private/Template/CSSResourceLocator.php

@@ -32,6 +32,8 @@ class CSSResourceLocator extends ResourceLocator {
 	public function doFind($style) {
 		if (strpos($style, '3rdparty') === 0
 			&& $this->appendIfExist($this->thirdpartyroot, $style.'.css')
+			|| $this->cacheAndAppendScssIfExist($this->serverroot, $style.'.scss')
+			|| $this->cacheAndAppendScssIfExist($this->serverroot, 'core/'.$style.'.scss')
 			|| $this->appendIfExist($this->serverroot, $style.'.css')
 			|| $this->appendIfExist($this->serverroot, 'core/'.$style.'.css')
 		) {

lib/private/Template/ResourceLocator.php

@@ -106,6 +106,33 @@ abstract class ResourceLocator {
 		return false;
 	}
 
+	/**
+	 * cache and append the scss $file if exist at $root
+	 *
+	 * @param string $root path to check
+	 * @param string $file the filename
+	 * @param string|null $webRoot base for path, default map $root to $webRoot
+	 * @return bool True if the resource was found and cached, false otherwise
+	 */
+	protected function cacheAndAppendScssIfExist($root, $file, $webRoot = null) {
+		if (is_file($root.'/'.$file)) {
+			$scssCache = new \OC\Template\SCSSCacher(
+				$this->logger,
+				$root,
+				$file);
+
+			if($scssCache->process()) {
+				$this->append($root, $scssCache->getCachedSCSS(), $webRoot, false);
+				$this->logger->debug($root.'/'.$file.' compiled and successfully cached', ['app' => 'SCSSPHP']);
+				return true;
+			} else {
+				$this->logger->error('Failed to compile and/or save '.$root.'/'.$file, ['app' => 'SCSSPHP']);
+				return false;
+			}
+		}
+		return false;
+	}
+
 	/**
 	 * append the $file resource at $root
 	 *

lib/private/Template/SCSSCacher.php

@@ -0,0 +1,110 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016, John Molakvoæ (skjnldsv@protonmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Template;
+
+use Leafo\ScssPhp\Compiler;
+use Leafo\ScssPhp\Exception\ParserException;
+
+class SCSSCacher {
+
+	protected $root;
+	protected $file;
+	protected $fileName;
+	protected $fileLoc;
+	protected $fileCache;
+	protected $rootCssLoc;
+
+	/** Cache folder from serverroot */
+	private $scssCache = "assets";
+
+
+	/** @var \OCP\ILogger */
+	protected $logger;
+
+	/**
+	 * @param \OCP\ILogger $logger
+	 * @param string $root
+	 * @param string $file
+	 */
+	public function __construct(\OCP\ILogger $logger, $root, $file) {
+		$this->logger = $logger;
+		$this->root = $root;
+		$this->file = explode('/', $root.'/'.$file);
+
+		$this->fileName = array_pop($this->file);
+		$this->fileLoc = implode('/', $this->file);
+		$this->fileCache = str_replace('.scss', '.css', $this->scssCache.'/'.$this->fileName);
+
+		// base uri to css file
+		$this->rootCssLoc = explode('/', $file);
+		array_pop($this->rootCssLoc);
+		$this->rootCssLoc = implode('/', $this->rootCssLoc);
+	}
+
+	public function process() {
+
+		if($this->is_cached($this->root.'/'.$this->fileCache, $this->fileLoc.'/'.$this->fileName)) {
+			return true;
+		} else {
+			return $this->cache();
+		}
+		return false;
+	}
+
+	private function is_cached($in, $out) {
+		if (! is_file($out) || filemtime($in) > filemtime($out)) {
+            return true;
+        }
+        return false;
+	}
+
+	private function cache() {
+		$scss = new Compiler();
+		$scss->setImportPaths($this->fileLoc);
+
+		if(\OC::$server->getSystemConfig()->getValue('debug')) {
+			// Debug mode
+			$scss->setFormatter('Leafo\ScssPhp\Formatter\Expanded');
+			$scss->setLineNumberStyle(Compiler::LINE_COMMENTS);
+		} else {
+			$scss->setFormatter('Leafo\ScssPhp\Formatter\Crunched');
+		}
+
+		try {
+			$compiledScss = $scss->compile('@import "'.$this->fileName.'";');
+		} catch(ParserException $e) {
+			$this->logger->error($e, ['app' => 'SCSSPHP']);
+			return false;
+		}
+		return file_put_contents($this->fileCache, $this->rebaseUrls($compiledScss));
+	}
+
+	private function rebaseUrls($css) {
+		$re = '/url\([\'"](.*)[\'"]\)/x';
+		$subst = 'url(\'../'.$this->rootCssLoc.'/$1\')';
+		return preg_replace($re, $subst, $css);
+	}
+
+	public function getCachedSCSS() {
+		return $this->fileCache;
+	}
+}