* Minify_ClosureCompiler::$jarFile = '/path/to/closure-compiler-20120123.jar'; * Minify_ClosureCompiler::$tempDir = '/tmp'; * $code = Minify_ClosureCompiler::minify( * $code, * array('compilation_level' => 'SIMPLE_OPTIMIZATIONS') * ); * * --compilation_level WHITESPACE_ONLY, SIMPLE_OPTIMIZATIONS, ADVANCED_OPTIMIZATIONS * * * * @todo unit tests, $options docs * @todo more options support (or should just passthru them all?) * * @package Minify * @author Stephen Clay * @author Elan Ruusamäe */ class Minify_ClosureCompiler { /** * Filepath of the Closure Compiler jar file. This must be set before * calling minifyJs(). * * @var string */ public static $jarFile = null; /** * Writable temp directory. This must be set before calling minifyJs(). * * @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 $options (verbose is ignored) * * @see https://code.google.com/p/closure-compiler/source/browse/trunk/README * * @return string */ public static function minify($js, $options = array()) { self::_prepare(); if (! ($tmpFile = tempnam(self::$tempDir, 'cc_'))) { throw new Exception('Minify_ClosureCompiler : could not create temp file.'); } file_put_contents($tmpFile, $js); exec(self::_getCmd($options, $tmpFile), $output, $result_code); unlink($tmpFile); if ($result_code != 0) { throw new Exception('Minify_ClosureCompiler : 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 ); $cmd = self::$javaExecutable . ' -jar ' . escapeshellarg(self::$jarFile) . (preg_match('/^[\\da-zA-Z0-9\\-]+$/', $o['charset']) ? " --charset {$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::$jarFile)) { throw new Exception('Minify_ClosureCompiler : $jarFile('.self::$jarFile.') is not a valid file.'); } if (! is_readable(self::$jarFile)) { throw new Exception('Minify_ClosureCompiler : $jarFile('.self::$jarFile.') is not readable.'); } if (! is_dir(self::$tempDir)) { throw new Exception('Minify_ClosureCompiler : $tempDir('.self::$tempDir.') is not a valid direcotry.'); } if (! is_writable(self::$tempDir)) { throw new Exception('Minify_ClosureCompiler : $tempDir('.self::$tempDir.') is not writable.'); } } } /* vim:ts=4:sw=4:et */