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<?php
namespace Hamcrest;
/**
* Convenient base class for Matchers that require a value of a specific type.
* This simply checks the type.
*
* While it may seem a useless exercise to have this in PHP, objects cannot
* be cast to certain data types such as numerics (or even strings if
* __toString() has not be defined).
*/
abstract class TypeSafeMatcher extends BaseMatcher
{
/* Types that PHP can compare against */
const TYPE_ANY = 0;
const TYPE_STRING = 1;
const TYPE_NUMERIC = 2;
const TYPE_ARRAY = 3;
const TYPE_OBJECT = 4;
const TYPE_RESOURCE = 5;
const TYPE_BOOLEAN = 6;
/**
* The type that is required for a safe comparison
*
* @var int
*/
private $_expectedType;
/**
* The subtype (e.g. class for objects) that is required
*
* @var string
*/
private $_expectedSubtype;
public function __construct($expectedType, $expectedSubtype = null)
{
$this->_expectedType = $expectedType;
$this->_expectedSubtype = $expectedSubtype;
}
final public function matches($item)
{
return $this->_isSafeType($item) && $this->matchesSafely($item);
}
final public function describeMismatch($item, Description $mismatchDescription)
{
if (!$this->_isSafeType($item)) {
parent::describeMismatch($item, $mismatchDescription);
} else {
$this->describeMismatchSafely($item, $mismatchDescription);
}
}
// -- Protected Methods
/**
* The item will already have been checked for the specific type and subtype.
*/
abstract protected function matchesSafely($item);
/**
* The item will already have been checked for the specific type and subtype.
*/
abstract protected function describeMismatchSafely($item, Description $mismatchDescription);
// -- Private Methods
private function _isSafeType($value)
{
switch ($this->_expectedType) {
case self::TYPE_ANY:
return true;
case self::TYPE_STRING:
return is_string($value) || is_numeric($value);
case self::TYPE_NUMERIC:
return is_numeric($value) || is_string($value);
case self::TYPE_ARRAY:
return is_array($value);
case self::TYPE_OBJECT:
return is_object($value)
&& ($this->_expectedSubtype === null
|| $value instanceof $this->_expectedSubtype);
case self::TYPE_RESOURCE:
return is_resource($value)
&& ($this->_expectedSubtype === null
|| get_resource_type($value) == $this->_expectedSubtype);
case self::TYPE_BOOLEAN:
return true;
default:
return true;
}
}
}
|
