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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\Input;
  13  
  14  use Symfony\Component\Console\Exception\InvalidArgumentException;
  15  use Symfony\Component\Console\Exception\LogicException;
  16  
  17  /**
  18   * Represents a command line argument.
  19   *
  20   * @author Fabien Potencier <fabien@symfony.com>
  21   */
  22  class InputArgument
  23  {
  24      const REQUIRED = 1;
  25      const OPTIONAL = 2;
  26      const IS_ARRAY = 4;
  27  
  28      private $name;
  29      private $mode;
  30      private $default;
  31      private $description;
  32  
  33      /**
  34       * @param string               $name        The argument name
  35       * @param int|null             $mode        The argument mode: self::REQUIRED or self::OPTIONAL
  36       * @param string               $description A description text
  37       * @param string|string[]|null $default     The default value (for self::OPTIONAL mode only)
  38       *
  39       * @throws InvalidArgumentException When argument mode is not valid
  40       */
  41      public function __construct($name, $mode = null, $description = '', $default = null)
  42      {
  43          if (null === $mode) {
  44              $mode = self::OPTIONAL;
  45          } elseif (!\is_int($mode) || $mode > 7 || $mode < 1) {
  46              throw new InvalidArgumentException(sprintf('Argument mode "%s" is not valid.', $mode));
  47          }
  48  
  49          $this->name = $name;
  50          $this->mode = $mode;
  51          $this->description = $description;
  52  
  53          $this->setDefault($default);
  54      }
  55  
  56      /**
  57       * Returns the argument name.
  58       *
  59       * @return string The argument name
  60       */
  61      public function getName()
  62      {
  63          return $this->name;
  64      }
  65  
  66      /**
  67       * Returns true if the argument is required.
  68       *
  69       * @return bool true if parameter mode is self::REQUIRED, false otherwise
  70       */
  71      public function isRequired()
  72      {
  73          return self::REQUIRED === (self::REQUIRED & $this->mode);
  74      }
  75  
  76      /**
  77       * Returns true if the argument can take multiple values.
  78       *
  79       * @return bool true if mode is self::IS_ARRAY, false otherwise
  80       */
  81      public function isArray()
  82      {
  83          return self::IS_ARRAY === (self::IS_ARRAY & $this->mode);
  84      }
  85  
  86      /**
  87       * Sets the default value.
  88       *
  89       * @param string|string[]|null $default The default value
  90       *
  91       * @throws LogicException When incorrect default value is given
  92       */
  93      public function setDefault($default = null)
  94      {
  95          if (self::REQUIRED === $this->mode && null !== $default) {
  96              throw new LogicException('Cannot set a default value except for InputArgument::OPTIONAL mode.');
  97          }
  98  
  99          if ($this->isArray()) {
 100              if (null === $default) {
 101                  $default = array();
 102              } elseif (!\is_array($default)) {
 103                  throw new LogicException('A default value for an array argument must be an array.');
 104              }
 105          }
 106  
 107          $this->default = $default;
 108      }
 109  
 110      /**
 111       * Returns the default value.
 112       *
 113       * @return string|string[]|null The default value
 114       */
 115      public function getDefault()
 116      {
 117          return $this->default;
 118      }
 119  
 120      /**
 121       * Returns the description text.
 122       *
 123       * @return string The description text
 124       */
 125      public function getDescription()
 126      {
 127          return $this->description;
 128      }
 129  }