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140 lines
4.4 KiB
PHP
140 lines
4.4 KiB
PHP
<?php
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/**
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* Class Minify_ClosureCompiler
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* @package Minify
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*/
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/**
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* Compress Javascript using the Closure Compiler
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*
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* You must set $jarFile and $tempDir before calling the minify functions.
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* Also, depending on your shell's environment, you may need to specify
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* the full path to java in $javaExecutable or use putenv() to setup the
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* Java environment.
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*
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* <code>
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* Minify_ClosureCompiler::$jarFile = '/path/to/closure-compiler-20120123.jar';
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* Minify_ClosureCompiler::$tempDir = '/tmp';
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* $code = Minify_ClosureCompiler::minify(
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* $code,
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* array('compilation_level' => 'SIMPLE_OPTIMIZATIONS')
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* );
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*
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* --compilation_level WHITESPACE_ONLY, SIMPLE_OPTIMIZATIONS, ADVANCED_OPTIMIZATIONS
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*
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* </code>
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*
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* @todo unit tests, $options docs
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* @todo more options support (or should just passthru them all?)
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*
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* @package Minify
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* @author Stephen Clay <steve@mrclay.org>
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* @author Elan Ruusamäe <glen@delfi.ee>
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*/
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class Minify_ClosureCompiler {
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const OPTION_CHARSET = 'charset';
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const OPTION_COMPILATION_LEVEL = 'compilation_level';
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public static $isDebug = false;
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/**
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* Filepath of the Closure Compiler jar file. This must be set before
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* calling minifyJs().
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*
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* @var string
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*/
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public static $jarFile = null;
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/**
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* Writable temp directory. This must be set before calling minifyJs().
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*
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* @var string
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*/
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public static $tempDir = null;
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/**
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* Filepath of "java" executable (may be needed if not in shell's PATH)
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*
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* @var string
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*/
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public static $javaExecutable = 'java';
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/**
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* Minify a Javascript string
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*
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* @param string $js
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*
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* @param array $options (verbose is ignored)
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*
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* @see https://code.google.com/p/closure-compiler/source/browse/trunk/README
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*
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* @return string
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*
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* @throws Minify_ClosureCompiler_Exception
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*/
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public static function minify($js, $options = array())
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{
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self::_prepare();
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if (! ($tmpFile = tempnam(self::$tempDir, 'cc_'))) {
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throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : could not create temp file in "'.self::$tempDir.'".');
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}
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file_put_contents($tmpFile, $js);
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$cmd = self::_getCmd($options, $tmpFile);
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exec($cmd, $output, $result_code);
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unlink($tmpFile);
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if ($result_code != 0) {
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$message = 'Minify_ClosureCompiler : Closure Compiler execution failed.';
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if (self::$isDebug) {
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exec($cmd . ' 2>&1', $error);
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if ($error) {
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$message .= "\nReason:\n" . join("\n", $error);
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}
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}
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throw new Minify_ClosureCompiler_Exception($message);
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}
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return implode("\n", $output);
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}
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private static function _getCmd($userOptions, $tmpFile)
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{
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$o = array_merge(
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array(
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self::OPTION_CHARSET => 'utf-8',
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self::OPTION_COMPILATION_LEVEL => 'SIMPLE_OPTIMIZATIONS',
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),
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$userOptions
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);
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$charsetOption = $o[self::OPTION_CHARSET];
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$cmd = self::$javaExecutable . ' -jar ' . escapeshellarg(self::$jarFile)
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. (preg_match('/^[\\da-zA-Z0-9\\-]+$/', $charsetOption)
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? " --charset {$charsetOption}"
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: '');
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foreach (array(self::OPTION_COMPILATION_LEVEL) as $opt) {
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if ($o[$opt]) {
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$cmd .= " --{$opt} ". escapeshellarg($o[$opt]);
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}
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}
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return $cmd . ' ' . escapeshellarg($tmpFile);
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}
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private static function _prepare()
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{
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if (! is_file(self::$jarFile)) {
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throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $jarFile('.self::$jarFile.') is not a valid file.');
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}
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if (! is_readable(self::$jarFile)) {
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throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $jarFile('.self::$jarFile.') is not readable.');
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}
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if (! is_dir(self::$tempDir)) {
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throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $tempDir('.self::$tempDir.') is not a valid direcotry.');
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}
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if (! is_writable(self::$tempDir)) {
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throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $tempDir('.self::$tempDir.') is not writable.');
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}
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}
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}
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class Minify_ClosureCompiler_Exception extends Exception {}
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