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<?php

/*
 * This file is part of the Prophecy.
 * (c) Konstantin Kudryashov <[email protected]>
 *     Marcello Duarte <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Prophecy\Argument\Token;

use Prophecy\Exception\InvalidArgumentException;

/**
 * Callback-verified token.
 *
 * @author Konstantin Kudryashov <[email protected]>
 */
class CallbackToken implements TokenInterface
{
    private $callback;

    /**
     * Initializes token.
     *
     * @param callable $callback
     *
     * @throws \Prophecy\Exception\InvalidArgumentException
     */
    public function __construct($callback)
    {
        if (!is_callable($callback)) {
            throw new InvalidArgumentException(sprintf(
                'Callable expected as an argument to CallbackToken, but got %s.',
                gettype($callback)
            ));
        }

        $this->callback = $callback;
    }

    /**
     * Scores 7 if callback returns true, false otherwise.
     *
     * @param $argument
     *
     * @return bool|int
     */
    public function scoreArgument($argument)
    {
        return call_user_func($this->callback, $argument) ? 7 : false;
    }

    /**
     * Returns false.
     *
     * @return bool
     */
    public function isLast()
    {
        return false;
    }

    /**
     * Returns string representation for token.
     *
     * @return string
     */
    public function __toString()
    {
        return 'callback()';
    }
}