<?php

namespace WP_CLI\Iterators;

use IteratorIterator;

/**
 * Applies one or more callbacks to an item before returning it.
 */
class Transform extends IteratorIterator {

    private $transformers = [];

    public function add_transform( $fn ) {
        $this->transformers[] = $fn;
    }

    #[\ReturnTypeWillChange]
    public function current() {
        $value = parent::current();

        foreach ( $this->transformers as $fn ) {
            $value = call_user_func( $fn, $value );
        }

        return $value;
    }
}