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<?php
namespace Hamcrest;

/*
 Copyright (c) 2012 hamcrest.org
 */

/**
 * Contains utility methods for handling Hamcrest matchers.
 *
 * @see Hamcrest\Matcher
 */
class Util
{
    public static function registerGlobalFunctions()
    {
        require_once __DIR__.'/../Hamcrest.php';
    }

    /**
     * Wraps the item with an IsEqual matcher if it isn't a matcher already.
     *
     * @param mixed $item matcher or any value
     * @return \Hamcrest\Matcher
     */
    public static function wrapValueWithIsEqual($item)
    {
        return ($item instanceof Matcher)
            ? $item
            : Core\IsEqual::equalTo($item)
            ;
    }

    /**
     * Throws an exception if any item in $matchers is not a Hamcrest\Matcher.
     *
     * @param array $matchers expected to contain only matchers
     * @throws \InvalidArgumentException if any item is not a matcher
     */
    public static function checkAllAreMatchers(array $matchers)
    {
        foreach ($matchers as $m) {
            if (!($m instanceof Matcher)) {
                throw new \InvalidArgumentException(
                    'Each argument or element must be a Hamcrest matcher'
                );
            }
        }
    }

    /**
     * Returns a copy of $items where each non-Matcher item is replaced by
     * a Hamcrest\Core\IsEqual matcher for the item. If the first and only item
     * is an array, it is used as the $items array to support the old style
     * of passing an array as the sole argument to a matcher.
     *
     * @param array $items contains items and matchers
     * @return array<Matchers> all items are
     */
    public static function createMatcherArray(array $items)
    {
        //Extract single array item
        if (count($items) == 1 && is_array($items[0])) {
            $items = $items[0];
        }

        //Replace non-matchers
        foreach ($items as &$item) {
            if (!($item instanceof Matcher)) {
                $item = Core\IsEqual::equalTo($item);
            }
        }

        return $items;
    }
}