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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\Console\Formatter;
  13  
  14  use Symfony\Component\Console\Exception\InvalidArgumentException;
  15  
  16  /**
  17   * @author Jean-François Simon <contact@jfsimon.fr>
  18   */
  19  class OutputFormatterStyleStack
  20  {
  21      /**
  22       * @var OutputFormatterStyleInterface[]
  23       */
  24      private $styles;
  25  
  26      private $emptyStyle;
  27  
  28      public function __construct(OutputFormatterStyleInterface $emptyStyle = null)
  29      {
  30          $this->emptyStyle = $emptyStyle ?: new OutputFormatterStyle();
  31          $this->reset();
  32      }
  33  
  34      /**
  35       * Resets stack (ie. empty internal arrays).
  36       */
  37      public function reset()
  38      {
  39          $this->styles = [];
  40      }
  41  
  42      /**
  43       * Pushes a style in the stack.
  44       */
  45      public function push(OutputFormatterStyleInterface $style)
  46      {
  47          $this->styles[] = $style;
  48      }
  49  
  50      /**
  51       * Pops a style from the stack.
  52       *
  53       * @return OutputFormatterStyleInterface
  54       *
  55       * @throws InvalidArgumentException When style tags incorrectly nested
  56       */
  57      public function pop(OutputFormatterStyleInterface $style = null)
  58      {
  59          if (empty($this->styles)) {
  60              return $this->emptyStyle;
  61          }
  62  
  63          if (null === $style) {
  64              return array_pop($this->styles);
  65          }
  66  
  67          foreach (array_reverse($this->styles, true) as $index => $stackedStyle) {
  68              if ($style->apply('') === $stackedStyle->apply('')) {
  69                  $this->styles = \array_slice($this->styles, 0, $index);
  70  
  71                  return $stackedStyle;
  72              }
  73          }
  74  
  75          throw new InvalidArgumentException('Incorrectly nested style tag found.');
  76      }
  77  
  78      /**
  79       * Computes current style with stacks top codes.
  80       *
  81       * @return OutputFormatterStyle
  82       */
  83      public function getCurrent()
  84      {
  85          if (empty($this->styles)) {
  86              return $this->emptyStyle;
  87          }
  88  
  89          return $this->styles[\count($this->styles) - 1];
  90      }
  91  
  92      /**
  93       * @return $this
  94       */
  95      public function setEmptyStyle(OutputFormatterStyleInterface $emptyStyle)
  96      {
  97          $this->emptyStyle = $emptyStyle;
  98  
  99          return $this;
 100      }
 101  
 102      /**
 103       * @return OutputFormatterStyleInterface
 104       */
 105      public function getEmptyStyle()
 106      {
 107          return $this->emptyStyle;
 108      }
 109  }