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<?php
/**
* Class Minify_JS_ClosureCompiler
* @package Minify
*/
/**
* Minify Javascript using Google's Closure Compiler API
*
* @link http://code.google.com/closure/compiler/
* @package Minify
* @author Stephen Clay <steve@mrclay.org>
*
* @todo can use a stream wrapper to unit test this?
*/
class Minify_JS_ClosureCompiler {
const URL = 'http://closure-compiler.appspot.com/compile';
/**
* Minify Javascript code via HTTP request to the Closure Compiler API
*
* @param string $js input code
* @param array $options unused at this point
* @return string
*/
public static function minify($js, array $options = array())
{
$obj = new self($options);
return $obj->min($js);
}
/**
*
* @param array $options
*
* fallbackFunc : default array($this, 'fallback');
*/
public function __construct(array $options = array())
{
$this->options = $options;
$this->_fallbackFunc = isset($options['fallbackMinifier'])
? $options['fallbackMinifier']
: array($this, '_fallback');
}
public function min($js)
{
if (trim($js) === '')
return $js;
$postBody = $this->_buildPostBody($js);
$bytes = (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2))
? mb_strlen($postBody, '8bit')
: strlen($postBody);
if ($bytes > 200000)
return $this->fail($js,
'File size is larger than Closure Compiler API limit (200000 bytes)');
$response = $this->_getResponse($postBody);
if (preg_match('/^Error\(\d\d?\):/', $response))
return $this->fail($response,
"Received errors from Closure Compiler API:\n$response");
return $response;
}
private function fail($js, $errorMessage) {
Minify0_Minify::$recoverableError = $errorMessage;
$response = "/* " . $errorMessage . "\n(Using fallback minifier)\n*/\n";
if (is_callable($this->_fallbackFunc))
$response .= call_user_func($this->_fallbackFunc, $js);
else
$response .= $js;
return $response;
}
protected $_fallbackFunc = null;
protected $_options = array();
protected function _getResponse($postBody)
{
$allowUrlFopen = preg_match('/1|yes|on|true/i', ini_get('allow_url_fopen'));
if ($allowUrlFopen) {
$contents = file_get_contents(self::URL, false, stream_context_create(array(
'http' => array(
'method' => 'POST',
'header' => "Content-type: application/x-www-form-urlencoded\r\nConnection: close\r\n",
'content' => $postBody,
'max_redirects' => 0,
'timeout' => 15,
)
)));
} elseif (defined('CURLOPT_POST')) {
$ch = curl_init(self::URL);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-type: application/x-www-form-urlencoded'));
curl_setopt($ch, CURLOPT_POSTFIELDS, $postBody);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 15);
$contents = curl_exec($ch);
curl_close($ch);
} else {
throw new Minify_JS_ClosureCompiler_Exception(
"Could not make HTTP request: allow_url_open is false and cURL not available"
);
}
if (false === $contents) {
throw new Minify_JS_ClosureCompiler_Exception(
"No HTTP response from server"
);
}
return trim($contents);
}
protected function _buildPostBody($js, $returnErrors = false)
{
$a = array(
'js_code' => $js,
'output_info' => ($returnErrors ? 'errors' : 'compiled_code'),
'output_format' => 'text',
'compilation_level' =>
(isset($this->options['compilation_level']) ?
$this->options['compilation_level'] :
'SIMPLE_OPTIMIZATIONS')
);
if (isset($this->options['formatting']) && !empty($this->options['formatting']))
$a['formatting'] = $this->options['formatting'];
return http_build_query($a, null, '&');
}
/**
* Default fallback function if CC API fails
* @param string $js
* @return string
*/
protected function _fallback($js)
{
return Minify0_JSMin::minify($js);
}
public static function test(&$error) {
try {
self::minify('alert("ok");');
$error = 'OK';
return true;
} catch (Exception $exception) {
$error = $exception->getMessage();
return false;
}
}
}
class Minify_JS_ClosureCompiler_Exception extends Exception {}