<?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 = '([^ ]+?)(?: |(?<!\\\\)"|(?<!\\\\)\'|$)';

    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

     *

     * @api

     */

    public function __construct($input, InputDefinition $definition = null)

    {

        parent::__construct(array(), $definition);

        $this->setTokens($this->tokenize($input));

    }

    /**

     * Tokenizes a string.

     *

     * @param string $input The input to tokenize

     * @throws \InvalidArgumentException When unable to parse input (should never happen)

     */

    private function tokenize($input)

    {

        $input = preg_replace('/(\r\n|\r|\n|\t)/', ' ', $input);

        $tokens = array();

        $length = strlen($input);

        $cursor = 0;

        while ($cursor < $length) {

            if (preg_match('/\s+/A', $input, $match, null, $cursor)) {

            } elseif (preg_match('/([^="\' ]+?)(=?)('.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;

    }

}