140 lines
4.4 KiB
PHP
140 lines
4.4 KiB
PHP
<?php
|
|
/**
|
|
* Class Minify_ClosureCompiler
|
|
* @package Minify
|
|
*/
|
|
|
|
/**
|
|
* Compress Javascript using the Closure Compiler
|
|
*
|
|
* 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 $javaExecutable or use putenv() to setup the
|
|
* Java environment.
|
|
*
|
|
* <code>
|
|
* Minify_ClosureCompiler::$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
|
|
*
|
|
* </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 {
|
|
|
|
const OPTION_CHARSET = 'charset';
|
|
const OPTION_COMPILATION_LEVEL = 'compilation_level';
|
|
|
|
public static $isDebug = false;
|
|
|
|
/**
|
|
* 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 $options (verbose is ignored)
|
|
*
|
|
* @see https://code.google.com/p/closure-compiler/source/browse/trunk/README
|
|
*
|
|
* @return string
|
|
*
|
|
* @throws Minify_ClosureCompiler_Exception
|
|
*/
|
|
public static function minify($js, $options = array())
|
|
{
|
|
self::_prepare();
|
|
if (! ($tmpFile = tempnam(self::$tempDir, 'cc_'))) {
|
|
throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : could not create temp file in "'.self::$tempDir.'".');
|
|
}
|
|
file_put_contents($tmpFile, $js);
|
|
$cmd = self::_getCmd($options, $tmpFile);
|
|
exec($cmd, $output, $result_code);
|
|
unlink($tmpFile);
|
|
if ($result_code != 0) {
|
|
$message = 'Minify_ClosureCompiler : Closure Compiler execution failed.';
|
|
if (self::$isDebug) {
|
|
exec($cmd . ' 2>&1', $error);
|
|
if ($error) {
|
|
$message .= "\nReason:\n" . join("\n", $error);
|
|
}
|
|
}
|
|
throw new Minify_ClosureCompiler_Exception($message);
|
|
}
|
|
return implode("\n", $output);
|
|
}
|
|
|
|
private static function _getCmd($userOptions, $tmpFile)
|
|
{
|
|
$o = array_merge(
|
|
array(
|
|
self::OPTION_CHARSET => 'utf-8',
|
|
self::OPTION_COMPILATION_LEVEL => 'SIMPLE_OPTIMIZATIONS',
|
|
),
|
|
$userOptions
|
|
);
|
|
$charsetOption = $o[self::OPTION_CHARSET];
|
|
$cmd = self::$javaExecutable . ' -jar ' . escapeshellarg(self::$jarFile)
|
|
. (preg_match('/^[\\da-zA-Z0-9\\-]+$/', $charsetOption)
|
|
? " --charset {$charsetOption}"
|
|
: '');
|
|
|
|
foreach (array(self::OPTION_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 Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $jarFile('.self::$jarFile.') is not a valid file.');
|
|
}
|
|
if (! is_readable(self::$jarFile)) {
|
|
throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $jarFile('.self::$jarFile.') is not readable.');
|
|
}
|
|
if (! is_dir(self::$tempDir)) {
|
|
throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $tempDir('.self::$tempDir.') is not a valid direcotry.');
|
|
}
|
|
if (! is_writable(self::$tempDir)) {
|
|
throw new Minify_ClosureCompiler_Exception('Minify_ClosureCompiler : $tempDir('.self::$tempDir.') is not writable.');
|
|
}
|
|
}
|
|
}
|
|
|
|
class Minify_ClosureCompiler_Exception extends Exception {}
|