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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Jesus M. Castagnetto <jmcastagnetto@php.net> |
// +----------------------------------------------------------------------+
//
// $Id: Integer.php,v 1.1 2003/01/02 01:55:05 jmcastagnetto Exp $
//
include_once 'PEAR.php';
/**
* The maximum integer we will accept if using the standard signed long
*/
define ('MATH_MAXINT', 2147483647);
// allow for user override of the integer library to use
if (!defined('MATH_INTLIB')) {
if (extension_loaded('gmp')) {
define ('MATH_INTLIB', 'gmp');
} elseif (extension_loaded('bcmath')) {
define ('MATH_INTLIB', 'bcmath');
bcscale(0);
} else {
define ('MATH_INTLIB', 'std');
}
}
/**
* Class to represent integers. If the GMP or BCMATH libraries are present the
* integer can be of arbitrary size, otherwise the internal PHP integer
* representation will be use (signed long). If the latter case, you cannot
* create Math_Integer objects bigger than MATH_MAXINT.
*
* @author Jesus M. Castagnetto <jmcastagnetto@php.net>
* @version 0.8
* @access public
* @package Math_Integer
*/
class Math_Integer {/*{{{*/
/**
* If the GMP library is present, this variable will contain the resource
* handle created using gmp_init(). If only the BCMATH library is present
* it will contain the string representation of the integer. If neither
* GMP or BCMATH are present, it will contain the actual integer.
*
* @access private
* @var mixed
*/
var $_value = null;
/**
* Class constructor, accepts an optional number or string representing the integer.
*
* @param optional mixed $num an integer or its string representation
* @return Math_Integer object
* @access public
*/
function Math_Integer($num=null) {/*{{{*/
if (!is_null($num)) {
$this->setValue($num);
}
}/*}}}*/
/**
* Method to set the value for the object
* @param optional mixed $num an integer or its string representation
* @return mixed TRUE on success, a PEAR_Error otherwise
* @access public
*/
function setValue($num) {/*{{{*/
if (!is_scalar($num)) {
$this->_value = null;
return PEAR::raiseError('Parameter is not a number');
}
switch (MATH_INTLIB) {
case 'gmp' :
$this->_value = gmp_init(strval($num));
return true;
break;
case 'bcmath' :
$this->_value = $num;
return true;
break;
case 'std' :
default :
if ($num > MATH_MAXINT) {
$this->_value = null;
return PEAR::raiseError('Cannot initialize, number > MATH_MAXINT '.
'and no gmp or bcmath extensions detected');
} else {
$this->_value = intval($num);
return true;
}
break;
}
}/*}}}*/
/**
* Returns the content of $this->_value
*
* @return mixed the value on success, a PEAR_Error otherwise
* @access public
*/
function getValue() {/*{{{*/
if (!$this->initialized()) {
return PEAR::raiseError('Math_Integer object not initialized');
}
return $this->_value;
}/*}}}*/
/**
* Returns a string representation of the value
*
* @return mixed a string on success, a PEAR_Error otherwise
* @access public
*/
function toString() {/*{{{*/
if (!$this->initialized()) {
return PEAR::raiseError('Math_Integer object not initialized');
}
if (MATH_INTLIB == 'gmp') {
return gmp_strval($this->_value);
} else { // for 'std' and 'bcmath'
return (string) $this->_value;
}
}/*}}}*/
/**
* Checks if the object has been succesfully initialized
*
* @return boolean TRUE if initialized, FALSE otherwise
* @access public
*/
function initialized() {/*{{{*/
return !is_null($this->_value);
}/*}}}*/
}/*}}} end of Math_Integer */
// vim: ts=4:sw=4:et:
// vim6: fdl=1:
?>
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