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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Config\Definition;
  13  
  14  /**
  15   * This class is the entry point for config normalization/merging/finalization.
  16   *
  17   * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  18   */
  19  class Processor
  20  {
  21      /**
  22       * Processes an array of configurations.
  23       *
  24       * @param NodeInterface $configTree The node tree describing the configuration
  25       * @param array         $configs    An array of configuration items to process
  26       *
  27       * @return array The processed configuration
  28       */
  29      public function process(NodeInterface $configTree, array $configs)
  30      {
  31          $currentConfig = array();
  32          foreach ($configs as $config) {
  33              $config = $configTree->normalize($config);
  34              $currentConfig = $configTree->merge($currentConfig, $config);
  35          }
  36  
  37          return $configTree->finalize($currentConfig);
  38      }
  39  
  40      /**
  41       * Processes an array of configurations.
  42       *
  43       * @param ConfigurationInterface $configuration The configuration class
  44       * @param array                  $configs       An array of configuration items to process
  45       *
  46       * @return array The processed configuration
  47       */
  48      public function processConfiguration(ConfigurationInterface $configuration, array $configs)
  49      {
  50          return $this->process($configuration->getConfigTreeBuilder()->buildTree(), $configs);
  51      }
  52  
  53      /**
  54       * Normalizes a configuration entry.
  55       *
  56       * This method returns a normalize configuration array for a given key
  57       * to remove the differences due to the original format (YAML and XML mainly).
  58       *
  59       * Here is an example.
  60       *
  61       * The configuration in XML:
  62       *
  63       * <twig:extension>twig.extension.foo</twig:extension>
  64       * <twig:extension>twig.extension.bar</twig:extension>
  65       *
  66       * And the same configuration in YAML:
  67       *
  68       * extensions: ['twig.extension.foo', 'twig.extension.bar']
  69       *
  70       * @param array  $config A config array
  71       * @param string $key    The key to normalize
  72       * @param string $plural The plural form of the key if it is irregular
  73       *
  74       * @return array
  75       */
  76      public static function normalizeConfig($config, $key, $plural = null)
  77      {
  78          if (null === $plural) {
  79              $plural = $key.'s';
  80          }
  81  
  82          if (isset($config[$plural])) {
  83              return $config[$plural];
  84          }
  85  
  86          if (isset($config[$key])) {
  87              if (\is_string($config[$key]) || !\is_int(key($config[$key]))) {
  88                  // only one
  89                  return  array($config[$key]);
  90              }
  91  
  92              return  $config[$key];
  93          }
  94  
  95          return array();
  96      }
  97  }