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   1  <?php
   2  
   3  namespace LesserPHP\Functions;
   4  
   5  use Exception;
   6  use LesserPHP\Lessc;
   7  use LesserPHP\Utils\Asserts;
   8  
   9  /**
  10   * Implements the list functions for LESS
  11   *
  12   * @link https://lesscss.org/functions/#list-functions
  13   */
  14  class Lists extends AbstractFunctionCollection
  15  {
  16      /** @inheritdoc */
  17      public function getFunctions(): array
  18      {
  19          return [
  20              //'length' => [$this, 'length'],
  21              'extract' => [$this, 'extract'],
  22              //'range' => [$this, 'range'],
  23              //'each' => [$this, 'each'],
  24          ];
  25      }
  26  
  27      // length is missing
  28  
  29      /**
  30       * Returns the value at a specified position in a list
  31       *
  32       * @link https://lesscss.org/functions/#list-functions-extract
  33       * @throws Exception
  34       */
  35      public function extract(array $value)
  36      {
  37          [$list, $idx] = Asserts::assertArgs($value, 2, 'extract');
  38          $idx = Asserts::assertNumber($idx);
  39          // 1 indexed
  40          if ($list[0] == 'list' && isset($list[2][$idx - 1])) {
  41              return $list[2][$idx - 1];
  42          }
  43  
  44          // FIXME what is the expected behavior here? Apparently it's not an error?
  45      }
  46  
  47      // range is missing
  48  
  49      // each is missing
  50  }