From b2c2e80cd031dfc85db212972031fd2056d3e8b0 Mon Sep 17 00:00:00 2001
From: Jan Brauer <jan@jimdo.com>
Date: Wed, 15 Jan 2014 16:54:47 +0100
Subject: [PATCH] Support for fast-closure-compiler

---
 min/lib/Minify/FastClosureCompiler.php | 114 +++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 min/lib/Minify/FastClosureCompiler.php

diff --git a/min/lib/Minify/FastClosureCompiler.php b/min/lib/Minify/FastClosureCompiler.php
new file mode 100644
index 0000000..2ace4d8
--- /dev/null
+++ b/min/lib/Minify/FastClosureCompiler.php
@@ -0,0 +1,114 @@
+<?php
+/**
+ * Class Minify_FastClosureCompiler
+ * @package Minify
+ */
+
+/**
+ * Compress Javascript using the Closure Compiler
+ *
+ * Needs https://npmjs.org/package/fast-closure-compiler to be installed
+ * You must set $binPath and $tempDir before calling the minify functions.
+ *
+ * <code>
+ * Minify_ClosureCompiler::$binPath = '/usr/local/bin/closure';
+ * Minify_ClosureCompiler::$tempDir = '/tmp';
+ * $code = Minify_ClosureCompiler::minify(
+ *   $code,
+ *   array('compilation_level' => 'SIMPLE_OPTIMIZATIONS')
+ * );
+ *
+ * --compilation_level WHITESPACE_ONLY, SIMPLE_OPTIMIZATIONS, ADVANCED_OPTIMIZATIONS
+ *
+ * </code>
+ *
+ * @todo unit tests, $options docs
+ * @todo more options support (or should just passthru them all?)
+ *
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ * @author Elan Ruusamäe <glen@delfi.ee>
+ */
+class Minify_ClosureCompiler {
+
+    /**
+     * Filepath of the Closure Compiler jar file. This must be set before
+     * calling minifyJs().
+     *
+     * @var string
+     */
+    public static $binPath = '/usr/local/bin/closure';
+
+    /**
+     * Writable temp directory. This must be set before calling minifyJs().
+     *
+     * @var string
+     */
+    public static $tempDir = '/tmp';
+
+    /**
+     * Minify a Javascript string
+     *
+     * @param string $js
+     *
+     * @param array $options (verbose is ignored)
+     *
+     * @see https://code.google.com/p/closure-compiler/source/browse/trunk/README
+     *
+     * @return string
+     */
+    public static function minify($js, $options = array())
+    {
+        self::_prepare();
+        if (! ($tmpFile = tempnam(self::$tempDir, 'cc_'))) {
+            throw new Exception('Minify_FastClosureCompiler : could not create temp file in "'.self::$tempDir.'".');
+        }
+        file_put_contents($tmpFile, $js);
+        exec(self::_getCmd($options, $tmpFile), $output, $result_code);
+        unlink($tmpFile);
+        if ($result_code != 0) {
+            throw new Exception('Minify_FastClosureCompiler : Closure Compiler execution failed.');
+        }
+        return implode("\n", $output);
+    }
+
+    private static function _getCmd($userOptions, $tmpFile)
+    {
+        $o = array_merge(
+            array(
+                'charset' => 'utf-8',
+                'compilation_level' => 'SIMPLE_OPTIMIZATIONS',
+            ),
+            $userOptions
+        );
+        $cmd = self::$binPath . ' ' . 
+             . (preg_match('/^[\\da-zA-Z0-9\\-]+$/', $o['charset'])
+                ? " --charset {$o['charset']}"
+                : '');
+
+        foreach (array('compilation_level') as $opt) {
+            if ($o[$opt]) {
+                $cmd .= " --{$opt} ". escapeshellarg($o[$opt]);
+            }
+        }
+        return $cmd . ' ' . escapeshellarg($tmpFile);
+    }
+
+    private static function _prepare()
+    {
+        if (! is_file(self::$binPath)) {
+            throw new Exception('Minify_FastClosureCompiler : $binPath('.self::$binPath.') is not a valid file.');
+        }
+        if (! is_readable(self::$binPath)) {
+            throw new Exception('Minify_FastClosureCompiler : $binPath('.self::$binPath.') is not readable.');
+        }
+        if (! is_dir(self::$tempDir)) {
+            throw new Exception('Minify_FastClosureCompiler : $tempDir('.self::$tempDir.') is not a valid directory.');
+        }
+        if (! is_writable(self::$tempDir)) {
+            throw new Exception('Minify_FastClosureCompiler : $tempDir('.self::$tempDir.') is not writable.');
+        }
+    }
+}
+
+/* vim:ts=4:sw=4:et */