<?php
  
  /*
   * This file is part of the Symfony package.
   *
   * (c) Fabien Potencier <fabien@symfony.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Symfony\Component\Console\Input;
  
  /**
   * StringInput represents an input provided as a string.
   *
   * Usage:
   *
   *     $input = new StringInput('foo --bar="foobar"');
   *
   * @author Fabien Potencier <fabien@symfony.com>
   *
   * @api
   */
  class StringInput extends ArgvInput
  {
      const REGEX_STRING = '([^\s]+?)(?:\s|(?<!\\\\)"|(?<!\\\\)\'|$)';
      const REGEX_QUOTED_STRING = '(?:"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\')';
  
      /**
       * Constructor.
       *
       * @param string          $input      An array of parameters from the CLI (in the argv format)
       * @param InputDefinition $definition A InputDefinition instance
       *
       * @deprecated The second argument is deprecated as it does not work (will be removed in 3.0), use 'bind' method instead
       *
       * @api
       */
      public function __construct($input, InputDefinition $definition = null)
      {
          parent::__construct(array(), null);
  
          $this->setTokens($this->tokenize($input));
  
          if (null !== $definition) {
              $this->bind($definition);
          }
      }
  
      /**
       * Tokenizes a string.
       *
       * @param string $input The input to tokenize
       *
       * @return array An array of tokens
       *
       * @throws \InvalidArgumentException When unable to parse input (should never happen)
       */
      private function tokenize($input)
      {
          $tokens = array();
          $length = strlen($input);
          $cursor = 0;
          while ($cursor < $length) {
              if (preg_match('/\s+/A', $input, $match, null, $cursor)) {
              } elseif (preg_match('/([^="\'\s]+?)(=?)('.self::REGEX_QUOTED_STRING.'+)/A', $input, $match, null, $cursor)) {
                  $tokens[] = $match[1].$match[2].stripcslashes(str_replace(array('"\'', '\'"', '\'\'', '""'), '', substr($match[3], 1, strlen($match[3]) - 2)));
              } elseif (preg_match('/'.self::REGEX_QUOTED_STRING.'/A', $input, $match, null, $cursor)) {
                  $tokens[] = stripcslashes(substr($match[0], 1, strlen($match[0]) - 2));
              } elseif (preg_match('/'.self::REGEX_STRING.'/A', $input, $match, null, $cursor)) {
                  $tokens[] = stripcslashes($match[1]);
              } else {
                  // should never happen
                  // @codeCoverageIgnoreStart
                  throw new \InvalidArgumentException(sprintf('Unable to parse input near "... %s ..."', substr($input, $cursor, 10)));
                  // @codeCoverageIgnoreEnd
              }
  
              $cursor += strlen($match[0]);
          }
  
          return $tokens;
      }
  }