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Editing:HasToString.php

<?php
namespace Hamcrest\Core;

/*
 Copyright (c) 2009 hamcrest.org
 */
use Hamcrest\Description;
use Hamcrest\FeatureMatcher;
use Hamcrest\Matcher;
use Hamcrest\Util;

/**
 * Matches if array size satisfies a nested matcher.
 */
class HasToString extends FeatureMatcher
{

public function __construct(Matcher $toStringMatcher)
    {
        parent::__construct(
            self::TYPE_OBJECT,
            null,
            $toStringMatcher,
            'an object with toString()',
            'toString()'
        );
    }

public function matchesSafelyWithDiagnosticDescription($actual, Description $mismatchDescription)
    {
        if (method_exists($actual, 'toString') || method_exists($actual, '__toString')) {
            return parent::matchesSafelyWithDiagnosticDescription($actual, $mismatchDescription);
        }

return false;
    }

protected function featureValueOf($actual)
    {
        if (method_exists($actual, 'toString')) {
            return $actual->toString();
        }

return (string) $actual;
    }

/**
     * Does array size satisfy a given matcher?
     *
     * @factory
     */
    public static function hasToString($matcher)
    {
        return new self(Util::wrapValueWithIsEqual($matcher));
    }
}

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Editing:HasToString.php