From fdc69a369e28e477d98c92b7692570435b6df740 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Elan=20Ruusam=C3=A4e?= <glen@delfi.ee>
Date: Wed, 12 Oct 2016 16:32:11 +0300
Subject: [PATCH] add scss support via leafo/scssphp

---
 composer.json                 |   1 +
 lib/Minify/ScssCssSource.php  | 169 ++++++++++++++++++++++++++++++++++
 lib/Minify/Source/Factory.php |  10 +-
 3 files changed, 177 insertions(+), 3 deletions(-)
 create mode 100644 lib/Minify/ScssCssSource.php

diff --git a/composer.json b/composer.json
index f7e6c2e..04c54ee 100644
--- a/composer.json
+++ b/composer.json
@@ -34,6 +34,7 @@
 	},
 	"require-dev": {
 		"leafo/lessphp": "~0.4.0",
+		"leafo/scssphp": "^0.6.6",
 		"meenie/javascript-packer": "~1.1",
 		"phpunit/phpunit": "4.8.*",
 		"tedivm/jshrink": "~1.1.0"
diff --git a/lib/Minify/ScssCssSource.php b/lib/Minify/ScssCssSource.php
new file mode 100644
index 0000000..cf40bc1
--- /dev/null
+++ b/lib/Minify/ScssCssSource.php
@@ -0,0 +1,169 @@
+<?php
+use Leafo\ScssPhp\Compiler;
+use Leafo\ScssPhp\Server;
+use Leafo\ScssPhp\Version;
+
+/**
+ * Class for using SCSS files
+ *
+ * @link https://github.com/leafo/scssphp/
+ */
+class Minify_ScssCssSource extends Minify_Source {
+    /**
+     * @var Minify_CacheInterface
+     */
+    private $cache;
+
+    /**
+     * Parsed SCSS cache object
+     *
+     * @var array
+     */
+    private $parsed;
+
+    /**
+     * @inheritdoc
+     */
+    public function __construct(array $spec, Minify_CacheInterface $cache)
+    {
+        parent::__construct($spec);
+
+        $this->cache = $cache;
+    }
+
+    /**
+     * Get last modified of all parsed files
+     *
+     * @return int
+     */
+    public function getLastModified()
+    {
+        $cache = $this->getCache();
+
+        return $cache['updated'];
+    }
+
+    /**
+     * Get content
+     *
+     * @return string
+     */
+    public function getContent()
+    {
+        $cache = $this->getCache();
+
+        return $cache['content'];
+    }
+
+    /**
+     * Make a unique cache id for for this source.
+     *
+     * @param string $prefix
+     *
+     * @return string
+     */
+    private function getCacheId($prefix = 'minify')
+    {
+        $md5 = md5($this->filepath);
+
+        return "{$prefix}_scss_{$md5}";
+    }
+
+    /**
+     * Get SCSS cache object
+     *
+     * Runs the compilation if needed
+     *
+     * Implements Leafo\ScssPhp\Server logic because we need to get parsed files without parsing actual content
+     *
+     * @return array
+     */
+    private function getCache()
+    {
+        // cache for single run
+        // so that getLastModified and getContent in single request do not add additional cache roundtrips (i.e memcache)
+        if (isset($this->parsed)) {
+            return $this->parsed;
+        }
+
+        // check from cache first
+        $cache = null;
+        $cacheId = $this->getCacheId();
+        if ($this->cache->isValid($cacheId, 0)) {
+            if ($cache = $this->cache->fetch($cacheId)) {
+                $cache = unserialize($cache);
+            }
+        }
+
+        $input = $cache ? $cache : $this->filepath;
+
+        if ($this->cacheIsStale($cache)) {
+            $cache = $this->compile($this->filepath);
+        }
+
+        if (!is_array($input) || $cache['updated'] > $input['updated']) {
+            $this->cache->store($cacheId, serialize($cache));
+        }
+
+        return $this->parsed = $cache;
+    }
+
+    /**
+     * Determine whether .scss file needs to be re-compiled.
+     *
+     * @param array $cache Cache object
+     *
+     * @return boolean True if compile required.
+     */
+    public function cacheIsStale($cache)
+    {
+        if (!$cache) {
+            return true;
+        }
+
+        $updated = $cache['updated'];
+        foreach ($cache['files'] as $import => $mtime) {
+            $filemtime = filemtime($import);
+
+            if ($filemtime !== $mtime || $filemtime > $updated) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Compile .scss file
+     *
+     * @param string $filename Input path (.scss)
+     *
+     * @see Server::compile()
+     * @return array meta data result of the compile
+     */
+    private function compile($filename)
+    {
+        $start = microtime(true);
+        $scss = new Compiler();
+        $css = $scss->compile(file_get_contents($filename), $filename);
+        $elapsed = round((microtime(true) - $start), 4);
+
+        $v = Version::VERSION;
+        $ts = date('r', $start);
+        $css = "/* compiled by scssphp $v on $ts (${elapsed}s) */\n\n" . $css;
+
+        $imports = $scss->getParsedFiles();
+
+        $updated = 0;
+        foreach ($imports as $mtime) {
+            $updated = max($updated, $mtime);
+        }
+
+        return array(
+            'elapsed' => $elapsed, // statistic, can be dropped
+            'updated' => $updated,
+            'content' => $css,
+            'files' => $imports,
+        );
+    }
+}
diff --git a/lib/Minify/Source/Factory.php b/lib/Minify/Source/Factory.php
index 7033179..71d7f08 100644
--- a/lib/Minify/Source/Factory.php
+++ b/lib/Minify/Source/Factory.php
@@ -67,9 +67,13 @@ class Minify_Source_Factory {
             throw new InvalidArgumentException("fileChecker option is not callable");
         }
 
-	    $this->setHandler('~\.less$~i', function ($spec) use ($cache) {
-		    return new Minify_LessCssSource($spec, $cache);
-	    });
+        $this->setHandler('~\.less$~i', function ($spec) use ($cache) {
+            return new Minify_LessCssSource($spec, $cache);
+        });
+
+        $this->setHandler('~\.scss~i', function ($spec) use ($cache) {
+            return new Minify_ScssCssSource($spec, $cache);
+        });
 
         $this->setHandler('~\.(js|css)$~i', function ($spec) {
             return new Minify_Source($spec);