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<?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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