[Summary view] [Print] [Text view]

   1  <?php
   2  
   3  /*
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2019 The s9e Authors
   6  * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
   7  */
   8  namespace s9e\TextFormatter\Configurator\JavaScript\Minifiers;
   9  use RuntimeException;
  10  use s9e\TextFormatter\Configurator\JavaScript\OnlineMinifier;
  11  class ClosureCompilerService extends OnlineMinifier
  12  {
  13      public $compilationLevel = 'ADVANCED_OPTIMIZATIONS';
  14      public $excludeDefaultExterns = \true;
  15      public $externs;
  16      public $url = 'https://closure-compiler.appspot.com/compile';
  17  	public function __construct()
  18      {
  19          parent::__construct();
  20          $this->externs = \file_get_contents(__DIR__ . '/../externs.service.js');
  21      }
  22  	public function getCacheDifferentiator()
  23      {
  24          $key = [$this->compilationLevel, $this->excludeDefaultExterns];
  25          if ($this->excludeDefaultExterns)
  26              $key[] = $this->externs;
  27          return $key;
  28      }
  29  	public function minify($src)
  30      {
  31          $body     = $this->generateRequestBody($src);
  32          $response = $this->query($body);
  33          if ($response === \false)
  34              throw new RuntimeException('Could not contact the Closure Compiler service');
  35          return $this->decodeResponse($response);
  36      }
  37  	protected function decodeResponse($response)
  38      {
  39          $response = \json_decode($response, \true);
  40          if (\is_null($response))
  41          {
  42              $msgs = array(
  43                      \JSON_ERROR_NONE => 'No error',
  44                      \JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
  45                      \JSON_ERROR_STATE_MISMATCH => 'State mismatch (invalid or malformed JSON)',
  46                      \JSON_ERROR_CTRL_CHAR => 'Control character error, possibly incorrectly encoded',
  47                      \JSON_ERROR_SYNTAX => 'Syntax error',
  48                      \JSON_ERROR_UTF8 => 'Malformed UTF-8 characters, possibly incorrectly encoded'
  49                  );
  50                  throw new RuntimeException('Closure Compiler service returned invalid JSON: ' . (isset($msgs[\json_last_error()]) ? $msgs[\json_last_error()] : 'Unknown error'));
  51          }
  52          if (isset($response['serverErrors'][0]))
  53          {
  54              $error = $response['serverErrors'][0];
  55              throw new RuntimeException('Server error ' . $error['code'] . ': ' . $error['error']);
  56          }
  57          if (isset($response['errors'][0]))
  58          {
  59              $error = $response['errors'][0];
  60              throw new RuntimeException('Compilation error: ' . $error['error']);
  61          }
  62          return $response['compiledCode'];
  63      }
  64  	protected function generateRequestBody($src)
  65      {
  66          $params = [
  67              'compilation_level' => $this->compilationLevel,
  68              'js_code'           => $src,
  69              'output_format'     => 'json',
  70              'output_info'       => 'compiled_code'
  71          ];
  72          if ($this->excludeDefaultExterns && $this->compilationLevel === 'ADVANCED_OPTIMIZATIONS')
  73          {
  74              $params['exclude_default_externs'] = 'true';
  75              $params['js_externs'] = $this->externs;
  76          }
  77          $body = \http_build_query($params) . '&output_info=errors';
  78          return $body;
  79      }
  80  	protected function query($body)
  81      {
  82          return $this->httpClient->post(
  83              $this->url,
  84              ['Content-Type: application/x-www-form-urlencoded'],
  85              $body
  86          );
  87      }
  88  }