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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2016 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\JavaScript\Minifiers; |
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use RuntimeException; |
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use s9e\TextFormatter\Configurator\JavaScript\Minifier; |
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class ClosureCompilerService extends Minifier |
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{ |
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/** |
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* @var string Closure Compiler's compilation level |
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*/ |
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public $compilationLevel = 'ADVANCED_OPTIMIZATIONS'; |
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/** |
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* @var bool Whether to exclude Closure Compiler's default externs |
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*/ |
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public $excludeDefaultExterns = true; |
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/** |
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* @var string Externs used for compilation |
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*/ |
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public $externs; |
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/** |
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* @var integer Read timeout in seconds |
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*/ |
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public $timeout = 10; |
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/** |
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* @var string Closure Compiler Service's URL |
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*/ |
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public $url = 'http://closure-compiler.appspot.com/compile'; |
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/** |
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* Constructor |
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*/ |
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public function __construct() |
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{ |
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$this->externs = file_get_contents(__DIR__ . '/../externs.service.js'); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCacheDifferentiator() |
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{ |
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$key = [$this->compilationLevel, $this->excludeDefaultExterns]; |
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if ($this->excludeDefaultExterns) |
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{ |
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$key[] = $this->externs; |
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} |
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return $key; |
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} |
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/** |
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* Compile given JavaScript source via the Closure Compiler Service |
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* |
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* @param string $src JavaScript source |
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* @return string Compiled source |
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*/ |
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public function minify($src) |
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{ |
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$body = $this->generateRequestBody($src); |
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$response = $this->query($body); |
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if (!$response) |
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{ |
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throw new RuntimeException('Could not contact the Closure Compiler service'); |
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} |
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return $this->decodeResponse($response); |
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} |
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/** |
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* Decode the response returned by the Closure Compiler service |
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* |
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* @param string $response Response body |
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* @return string Minified code |
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*/ |
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protected function decodeResponse($response) |
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{ |
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$response = json_decode($response, true); |
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if (is_null($response)) |
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{ |
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throw new RuntimeException('Closure Compiler service returned invalid JSON: ' . json_last_error_msg()); |
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} |
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if (isset($response['serverErrors'][0])) |
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{ |
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$error = $response['serverErrors'][0]; |
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throw new RuntimeException('Server error ' . $error['code'] . ': ' . $error['error']); |
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} |
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if (isset($response['errors'][0])) |
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{ |
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$error = $response['errors'][0]; |
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throw new RuntimeException('Compilation error: ' . $error['error']); |
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} |
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return $response['compiledCode']; |
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} |
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/** |
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* Generate the request body for given code |
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* |
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* @param string $src JavaScript source |
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* @return string Compiled source |
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*/ |
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protected function generateRequestBody($src) |
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{ |
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$params = [ |
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'compilation_level' => $this->compilationLevel, |
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'js_code' => $src, |
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'output_format' => 'json', |
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'output_info' => 'compiled_code' |
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]; |
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// Add our custom externs if default externs are disabled |
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if ($this->excludeDefaultExterns && $this->compilationLevel === 'ADVANCED_OPTIMIZATIONS') |
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{ |
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$params['exclude_default_externs'] = 'true'; |
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$params['js_externs'] = $this->externs; |
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} |
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// Add dupe variables by hand |
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$body = http_build_query($params) . '&output_info=errors'; |
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return $body; |
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} |
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/** |
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* Query the Closure Compiler service |
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* |
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* @param string $body Request body |
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* @return string|false Response body, or FALSE |
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*/ |
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protected function query($body) |
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{ |
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return file_get_contents( |
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$this->url, |
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false, |
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stream_context_create([ |
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'http' => [ |
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'method' => 'POST', |
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'timeout' => $this->timeout, |
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'header' => "Connection: close\r\n" |
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. "Content-length: " . strlen($body) . "\r\n" |
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. "Content-type: application/x-www-form-urlencoded", |
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'content' => $body |
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] |
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]) |
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); |
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} |
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} |
s9e /
TextFormatter
