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   1  <?php
   2  
   3  /**
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2022 The s9e authors
   6  * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
   7  */
   8  namespace s9e\TextFormatter\Configurator\JavaScript;
   9  
  10  use Exception;
  11  
  12  abstract class Minifier
  13  {
  14      /**
  15      * @var string Directory in which minified sources are cached
  16      */
  17      public $cacheDir;
  18  
  19      /**
  20      * @var bool If TRUE, don't interrupt get() if an exception is thrown. Instead, return the original source
  21      */
  22      public $keepGoing = false;
  23  
  24      /**
  25      * Minify given JavaScript source
  26      *
  27      * @param  string $src JavaScript source
  28      * @return string      Minified source
  29      */
  30      abstract public function minify($src);
  31  
  32      /**
  33      * Minify given JavaScript source and cache the result if applicable
  34      *
  35      * @param  string $src JavaScript source
  36      * @return string      Minified source
  37      */
  38  	public function get($src)
  39      {
  40          try
  41          {
  42              return (isset($this->cacheDir)) ? $this->getFromCache($src) : $this->minify($src);
  43          }
  44          catch (Exception $e)
  45          {
  46              if (!$this->keepGoing)
  47              {
  48                  throw $e;
  49              }
  50          }
  51  
  52          return $src;
  53      }
  54  
  55      /**
  56      * Return a value that uniquely identifies this minifier's configuration
  57      *
  58      * @return array|string
  59      */
  60  	public function getCacheDifferentiator()
  61      {
  62          return '';
  63      }
  64  
  65      /**
  66      * Get the minified source from cache, or minify and cache the result
  67      *
  68      * @param  string $src JavaScript source
  69      * @return string      Minified source
  70      */
  71  	protected function getFromCache($src)
  72      {
  73          $differentiator = $this->getCacheDifferentiator();
  74          $key            = sha1(serialize([get_class($this), $differentiator, $src]));
  75          $cacheFile      = $this->cacheDir . '/minifier.' . $key . '.js';
  76  
  77          if (!file_exists($cacheFile))
  78          {
  79              file_put_contents($cacheFile, $this->minify($src));
  80          }
  81  
  82          return file_get_contents($cacheFile);
  83      }
  84  }