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+<?php
+/**
+ * Class Minify_YUICompressor
+ * @package Minify
+ */
+
+/**
+ * Compress Javascript/CSS using the YUI Compressor
+ *
+ * You must set $jarFile and $tempDir before calling the minify functions.
+ * Also, depending on your shell's environment, you may need to specify
+ * the full path to java in $javaExecutable or use putenv() to setup the
+ * Java environment.
+ *
+ * <code>
+ * Minify_YUICompressor::$jarFile = '/path/to/yuicompressor-2.3.5.jar';
+ * Minify_YUICompressor::$tempDir = '/tmp';
+ * $code = Minify_YUICompressor::minifyJs(
+ * $code
+ * ,array('nomunge' => true, 'line-break' => 1000)
+ * );
+ * </code>
+ *
+ * @todo unit tests, $options docs
+ *
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ */
+class Minify_YUICompressor {
+
+ /**
+ * Filepath of the YUI Compressor jar file. This must be set before
+ * calling minifyJs() or minifyCss().
+ *
+ * @var string
+ */
+ public static $jarFile = null;
+
+ /**
+ * Writable temp directory. This must be set before calling minifyJs()
+ * or minifyCss().
+ *
+ * @var string
+ */
+ public static $tempDir = null;
+
+ /**
+ * Filepath of "java" executable (may be needed if not in shell's PATH)
+ *
+ * @var string
+ */
+ public static $javaExecutable = 'java';
+
+ /**
+ * Minify a Javascript string
+ *
+ * @param string $js
+ *
+ * @param array $options (verbose is ignored)
+ *
+ * @see http://www.julienlecomte.net/yuicompressor/README
+ *
+ * @return string
+ */
+ public static function minifyJs($js, $options = array())
+ {
+ return self::_minify('js', $js, $options);
+ }
+
+ /**
+ * Minify a CSS string
+ *
+ * @param string $css
+ *
+ * @param array $options (verbose is ignored)
+ *
+ * @see http://www.julienlecomte.net/yuicompressor/README
+ *
+ * @return string
+ */
+ public static function minifyCss($css, $options = array())
+ {
+ return self::_minify('css', $css, $options);
+ }
+
+ private static function _minify($type, $content, $options)
+ {
+ self::_prepare();
+ if (! ($tmpFile = tempnam(self::$tempDir, 'yuic_'))) {
+ throw new Exception('Minify_YUICompressor : could not create temp file.');
+ }
+ file_put_contents($tmpFile, $content);
+ exec(self::_getCmd($options, $type, $tmpFile), $output);
+ unlink($tmpFile);
+ return implode("\n", $output);
+ }
+
+ private static function _getCmd($userOptions, $type, $tmpFile)
+ {
+ $o = array_merge(
+ array(
+ 'charset' => ''
+ ,'line-break' => 5000
+ ,'type' => $type
+ ,'nomunge' => false
+ ,'preserve-semi' => false
+ ,'disable-optimizations' => false
+ )
+ ,$userOptions
+ );
+ $cmd = self::$javaExecutable . ' -jar ' . escapeshellarg(self::$jarFile)
+ . " --type {$type}"
+ . (preg_match('/^[a-zA-Z\\-]+$/', $o['charset'])
+ ? " --charset {$o['charset']}"
+ : '')
+ . (is_numeric($o['line-break']) && $o['line-break'] >= 0
+ ? ' --line-break ' . (int)$o['line-break']
+ : '');
+ if ($type === 'js') {
+ foreach (array('nomunge', 'preserve-semi', 'disable-optimizations') as $opt) {
+ $cmd .= $o[$opt]
+ ? " --{$opt}"
+ : '';
+ }
+ }
+ return $cmd . ' ' . escapeshellarg($tmpFile);
+ }
+
+ private static function _prepare()
+ {
+ if (! is_file(self::$jarFile)
+ || ! is_dir(self::$tempDir)
+ || ! is_writable(self::$tempDir)
+ ) {
+ throw new Exception('Minify_YUICompressor : $jarFile and $tempDir must be set.');
+ }
+ }
+}
+