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✏️ Editing: IsEmptyString.php

<?php
namespace Hamcrest\Text;

/*
 Copyright (c) 2009 hamcrest.org
 */
use Hamcrest\BaseMatcher;
use Hamcrest\Core\AnyOf;
use Hamcrest\Core\IsNull;
use Hamcrest\Description;

/**
 * Matches empty Strings (and null).
 */
class IsEmptyString extends BaseMatcher
{

private static $_INSTANCE;
    private static $_NULL_OR_EMPTY_INSTANCE;
    private static $_NOT_INSTANCE;

private $_empty;

public function __construct($empty = true)
    {
        $this->_empty = $empty;
    }

public function matches($item)
    {
        return $this->_empty
            ? ($item === '')
            : is_string($item) && $item !== '';
    }

public function describeTo(Description $description)
    {
        $description->appendText($this->_empty ? 'an empty string' : 'a non-empty string');
    }

/**
     * Matches if value is a zero-length string.
     *
     * @factory emptyString
     */
    public static function isEmptyString()
    {
        if (!self::$_INSTANCE) {
            self::$_INSTANCE = new self(true);
        }

return self::$_INSTANCE;
    }

/**
     * Matches if value is null or a zero-length string.
     *
     * @factory nullOrEmptyString
     */
    public static function isEmptyOrNullString()
    {
        if (!self::$_NULL_OR_EMPTY_INSTANCE) {
            self::$_NULL_OR_EMPTY_INSTANCE = AnyOf::anyOf(
                IsNull::nullvalue(),
                self::isEmptyString()
            );
        }

return self::$_NULL_OR_EMPTY_INSTANCE;
    }

/**
     * Matches if value is a non-zero-length string.
     *
     * @factory nonEmptyString
     */
    public static function isNonEmptyString()
    {
        if (!self::$_NOT_INSTANCE) {
            self::$_NOT_INSTANCE = new self(false);
        }

return self::$_NOT_INSTANCE;
    }
}

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