<?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;

use Symfony\Component\Console\Exception\InvalidArgumentException;

/**
* StringInput represents an input provided as a string.
*
* Usage:
*
* $input = new StringInput('foo --bar="foobar"');
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class StringInput extends ArgvInput
{
public const REGEX_STRING = '([^\s]+?)(?:\s|(?<!\\\\)"|(?<!\\\\)\'|$)';
public const REGEX_UNQUOTED_STRING = '([^\s\\\\]+?)';
public const REGEX_QUOTED_STRING = '(?:"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\')';

/**
* @param string $input A string representing the parameters from the CLI
*/
public function __construct(string $input)
{
parent::__construct([]);

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

/**
* Tokenizes a string.
*
* @throws InvalidArgumentException When unable to parse input (should never happen)
*/
private function tokenize(string $input): array
{
$tokens = [];
$length = \strlen($input);
$cursor = 0;
$token = null;
while ($cursor < $length) {
if ('\\' === $input[$cursor]) {
$token .= $input[++$cursor] ?? '';
++$cursor;
continue;
}

if (preg_match('/\s+/A', $input, $match, 0, $cursor)) {
if (null !== $token) {
$tokens[] = $token;
$token = null;
}
} elseif (preg_match('/([^="\'\s]+?)(=?)('.self::REGEX_QUOTED_STRING.'+)/A', $input, $match, 0, $cursor)) {
$token .= $match[1].$match[2].stripcslashes(str_replace(['"\'', '\'"', '\'\'', '""'], '', substr($match[3], 1, -1)));
} elseif (preg_match('/'.self::REGEX_QUOTED_STRING.'/A', $input, $match, 0, $cursor)) {
$token .= stripcslashes(substr($match[0], 1, -1));
} elseif (preg_match('/'.self::REGEX_UNQUOTED_STRING.'/A', $input, $match, 0, $cursor)) {
$token .= $match[1];
} else {
// should never happen
throw new InvalidArgumentException(sprintf('Unable to parse input near "... %s ...".', substr($input, $cursor, 10)));
}

$cursor += \strlen($match[0]);
}

if (null !== $token) {
$tokens[] = $token;
}

return $tokens;
}
}