1: <?php
  2: /**
  3:  * Hard type support
  4:  * For when you absolutely want to know what you are getting
  5:  *
  6:  * @author Ashley Kitson <akitson@zf4.biz>
  7:  * @copyright Ashley Kitson, UK, 2014
  8:  * @licence GPL V3 or later : http://www.gnu.org/licenses/gpl.html
  9:  */
 10: 
 11: namespace chippyash\Type\String;
 12: 
 13: use chippyash\Type\AbstractType;
 14: use chippyash\Zend\ErrorHandler;
 15: 
 16: /**
 17:  * Numeric String Type
 18:  *
 19:  */
 20: class DigitType extends AbstractType
 21: {
 22: 
 23:     /**
 24:      * Is PCRE compiled with Unicode support?
 25:      *
 26:      * @var bool
 27:      **/
 28:     protected static $hasPcreUnicodeSupport = null;
 29: 
 30:     /**
 31:      * This will filter out any non numeric characters.  You may potentially
 32:      * get an empty string
 33:      *
 34:      * @param mixed $value
 35:      * @return string
 36:      */
 37:     protected function typeOf($value)
 38:     {
 39:         return (string) $this->filter($value);
 40:     }
 41: 
 42:     /**
 43:      * Lifted entirely from the Zend framework so that we don't have to include
 44:      * the Zend\Filter package and all its dependencies.
 45:      *
 46:      * @param  string $value
 47:      * @return string|mixed
 48: 
 49:      * zendframework/zend-filter/Zend/Filter/Digits.php
 50:      * Zend Framework (http://framework.zend.com/)
 51:      *
 52:      * @link      http://github.com/zendframework/zf2 for the canonical source repository
 53:      * @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
 54:      * @license   http://framework.zend.com/license/new-bsd New BSD License
 55:      * Defined by Zend\Filter\FilterInterface
 56:      *
 57:      * Returns the string $value, removing all but digit characters
 58:      *
 59:      * If the value provided is non-scalar, the value will remain unfiltered
 60:      *
 61:      */
 62:     protected function filter($value)
 63:     {
 64:         if (!is_scalar($value)) {
 65:             return $value;
 66:         }
 67:         $value = (string) $value;
 68: 
 69:         if (!$this->hasPcreUnicodeSupport()) {
 70:             // POSIX named classes are not supported, use alternative 0-9 match
 71:             $pattern = '/[^0-9]/';
 72:         } elseif (extension_loaded('mbstring')) {
 73:             // Filter for the value with mbstring
 74:             $pattern = '/[^[:digit:]]/';
 75:         } else {
 76:             // Filter for the value without mbstring
 77:             $pattern = '/[\p{^N}]/';
 78:         }
 79: 
 80:         return preg_replace($pattern, '', $value);
 81:     }
 82: 
 83:     /**
 84:      * Lifted entirely from Zend Framework (http://framework.zend.com/) so we don't have
 85:      * to include Zend/Stdlib
 86:      *
 87:      * @link      http://github.com/zendframework/zf2 for the canonical source repository
 88:      * @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
 89:      * @license   http://framework.zend.com/license/new-bsd New BSD License
 90:      * Is PCRE compiled with Unicode support?
 91:      *
 92:      * @return bool
 93:      */
 94:     protected function hasPcreUnicodeSupport()
 95:     {
 96:         if (static::$hasPcreUnicodeSupport === null) {
 97:             ErrorHandler::start();
 98:             static::$hasPcreUnicodeSupport =
 99:                 defined('PREG_BAD_UTF8_OFFSET_ERROR') && preg_match('/\pL/u', 'a') == 1;
100:             ErrorHandler::stop();
101:         }
102:         return static::$hasPcreUnicodeSupport;
103:     }
104: }
105: