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   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;
   9  class ConfigOptimizer
  10  {
  11      protected $configValues;
  12      protected $encoder;
  13      protected $jsLengths;
  14  	public function __construct(Encoder $encoder)
  15      {
  16          $this->encoder = $encoder;
  17          $this->reset();
  18      }
  19  	public function getVarDeclarations()
  20      {
  21          \asort($this->jsLengths);
  22          $src = '';
  23          foreach (\array_keys($this->jsLengths) as $varName)
  24          {
  25              $configValue = $this->configValues[$varName];
  26              if ($configValue->isDeduplicated())
  27                  $src .= '/** @const */ var ' . $varName . '=' . $this->encoder->encode($configValue->getValue()) . ";\n";
  28          }
  29          return $src;
  30      }
  31  	public function optimize($object)
  32      {
  33          return \current($this->optimizeObjectContent([$object]))->getValue();
  34      }
  35  	public function reset()
  36      {
  37          $this->configValues = [];
  38          $this->jsLengths    = [];
  39      }
  40  	protected function canDeduplicate($value)
  41      {
  42          if (\is_array($value) || $value instanceof Dictionary)
  43              return (bool) \count($value);
  44          return ($value instanceof Code);
  45      }
  46  	protected function deduplicateConfigValues()
  47      {
  48          \arsort($this->jsLengths);
  49          foreach (\array_keys($this->jsLengths) as $varName)
  50          {
  51              $configValue = $this->configValues[$varName];
  52              if ($configValue->getUseCount() > 1)
  53                  $configValue->deduplicate();
  54          }
  55      }
  56  	protected function getVarName($js)
  57      {
  58          return \sprintf('o%08X', \crc32($js));
  59      }
  60  	protected function isIterable($value)
  61      {
  62          return (\is_array($value) || $value instanceof Dictionary);
  63      }
  64  	protected function optimizeObjectContent($object)
  65      {
  66          $object = $this->recordObject($object);
  67          $this->deduplicateConfigValues();
  68          return $object->getValue();
  69      }
  70  	protected function recordObject($object)
  71      {
  72          $js      = $this->encoder->encode($object);
  73          $varName = $this->getVarName($js);
  74          if ($this->isIterable($object))
  75              $object = $this->recordObjectContent($object);
  76          if (!isset($this->configValues[$varName]))
  77          {
  78              $this->configValues[$varName] = new ConfigValue($object, $varName);
  79              $this->jsLengths[$varName]    = \strlen($js);
  80          }
  81          $this->configValues[$varName]->incrementUseCount();
  82          return $this->configValues[$varName];
  83      }
  84  	protected function recordObjectContent($object)
  85      {
  86          foreach ($object as $k => $v)
  87              if ($this->canDeduplicate($v) && !$this->shouldPreserve($v))
  88                  $object[$k] = $this->recordObject($v);
  89          return $object;
  90      }
  91  	protected function shouldPreserve($value)
  92      {
  93          return ($value instanceof Code && \preg_match('(^\\w+$)', $value));
  94      }
  95  }