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    <h3>Editing: Input.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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;
use Symfony\Component\Console\Exception\RuntimeException;

/**
 * Input is the base class for all concrete Input classes.
 *
 * Three concrete classes are provided by default:
 *
 *  * `ArgvInput`: The input comes from the CLI arguments (argv)
 *  * `StringInput`: The input is provided as a string
 *  * `ArrayInput`: The input is provided as an array
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
abstract class Input implements InputInterface, StreamableInputInterface
{
    protected $definition;
    protected $stream;
    protected $options = [];
    protected $arguments = [];
    protected $interactive = true;

    public function __construct(InputDefinition $definition = null)
    {
        if (null === $definition) {
            $this-&gt;definition = new InputDefinition();
        } else {
            $this-&gt;bind($definition);
            $this-&gt;validate();
        }
    }

    public function bind(InputDefinition $definition)
    {
        $this-&gt;arguments = [];
        $this-&gt;options = [];
        $this-&gt;definition = $definition;

        $this-&gt;parse();
    }

    /**
     * Processes command line arguments.
     */
    abstract protected function parse();

    public function validate()
    {
        $definition = $this-&gt;definition;
        $givenArguments = $this-&gt;arguments;

        $missingArguments = array_filter(array_keys($definition-&gt;getArguments()), function ($argument) use ($definition, $givenArguments) {
            return !\array_key_exists($argument, $givenArguments) &amp;&amp; $definition-&gt;getArgument($argument)-&gt;isRequired();
        });

        if (\count($missingArguments) &gt; 0) {
            throw new RuntimeException(sprintf('Not enough arguments (missing: &quot;%s&quot;).', implode(', ', $missingArguments)));
        }
    }

    public function isInteractive(): bool
    {
        return $this-&gt;interactive;
    }

    public function setInteractive(bool $interactive)
    {
        $this-&gt;interactive = $interactive;
    }

    public function getArguments(): array
    {
        return array_merge($this-&gt;definition-&gt;getArgumentDefaults(), $this-&gt;arguments);
    }

    public function getArgument(string $name): mixed
    {
        if (!$this-&gt;definition-&gt;hasArgument($name)) {
            throw new InvalidArgumentException(sprintf('The &quot;%s&quot; argument does not exist.', $name));
        }

        return $this-&gt;arguments[$name] ?? $this-&gt;definition-&gt;getArgument($name)-&gt;getDefault();
    }

    public function setArgument(string $name, mixed $value)
    {
        if (!$this-&gt;definition-&gt;hasArgument($name)) {
            throw new InvalidArgumentException(sprintf('The &quot;%s&quot; argument does not exist.', $name));
        }

        $this-&gt;arguments[$name] = $value;
    }

    public function hasArgument(string $name): bool
    {
        return $this-&gt;definition-&gt;hasArgument($name);
    }

    public function getOptions(): array
    {
        return array_merge($this-&gt;definition-&gt;getOptionDefaults(), $this-&gt;options);
    }

    public function getOption(string $name): mixed
    {
        if ($this-&gt;definition-&gt;hasNegation($name)) {
            if (null === $value = $this-&gt;getOption($this-&gt;definition-&gt;negationToName($name))) {
                return $value;
            }

            return !$value;
        }

        if (!$this-&gt;definition-&gt;hasOption($name)) {
            throw new InvalidArgumentException(sprintf('The &quot;%s&quot; option does not exist.', $name));
        }

        return \array_key_exists($name, $this-&gt;options) ? $this-&gt;options[$name] : $this-&gt;definition-&gt;getOption($name)-&gt;getDefault();
    }

    public function setOption(string $name, mixed $value)
    {
        if ($this-&gt;definition-&gt;hasNegation($name)) {
            $this-&gt;options[$this-&gt;definition-&gt;negationToName($name)] = !$value;

            return;
        } elseif (!$this-&gt;definition-&gt;hasOption($name)) {
            throw new InvalidArgumentException(sprintf('The &quot;%s&quot; option does not exist.', $name));
        }

        $this-&gt;options[$name] = $value;
    }

    public function hasOption(string $name): bool
    {
        return $this-&gt;definition-&gt;hasOption($name) || $this-&gt;definition-&gt;hasNegation($name);
    }

    /**
     * Escapes a token through escapeshellarg if it contains unsafe chars.
     */
    public function escapeToken(string $token): string
    {
        return preg_match('{^[\w-]+$}', $token) ? $token : escapeshellarg($token);
    }

    public function setStream($stream)
    {
        $this-&gt;stream = $stream;
    }

    public function getStream()
    {
        return $this-&gt;stream;
    }
}
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