/concrete/libraries/3rdparty/Zend/Locale/Math/PhpMath.php
PHP | 247 lines | 184 code | 31 blank | 32 comment | 39 complexity | 52ffda0dd79bbcb0e3f5960a6a3d97e1 MD5 | raw file
- <?php
- /**
- * Zend Framework
- *
- * LICENSE
- *
- * This source file is subject to the new BSD license that is bundled
- * with this package in the file LICENSE.txt.
- * It is also available through the world-wide-web at this URL:
- * http://framework.zend.com/license/new-bsd
- * If you did not receive a copy of the license and are unable to
- * obtain it through the world-wide-web, please send an email
- * to license@zend.com so we can send you a copy immediately.
- *
- * @category Zend
- * @package Zend_Locale
- * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: PhpMath.php 23775 2011-03-01 17:25:24Z ralph $
- */
- /**
- * Utility class for proxying math function to bcmath functions, if present,
- * otherwise to PHP builtin math operators, with limited detection of overflow conditions.
- * Sampling of PHP environments and platforms suggests that at least 80% to 90% support bcmath.
- * This file should only be loaded for the 10% to 20% lacking access to the bcmath extension.
- *
- * @category Zend
- * @package Zend_Locale
- * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- */
- class Zend_Locale_Math_PhpMath extends Zend_Locale_Math
- {
- public static function disable()
- {
- self::$_bcmathDisabled = true;
- self::$add = array('Zend_Locale_Math_PhpMath', 'Add');
- self::$sub = array('Zend_Locale_Math_PhpMath', 'Sub');
- self::$pow = array('Zend_Locale_Math_PhpMath', 'Pow');
- self::$mul = array('Zend_Locale_Math_PhpMath', 'Mul');
- self::$div = array('Zend_Locale_Math_PhpMath', 'Div');
- self::$comp = array('Zend_Locale_Math_PhpMath', 'Comp');
- self::$sqrt = array('Zend_Locale_Math_PhpMath', 'Sqrt');
- self::$mod = array('Zend_Locale_Math_PhpMath', 'Mod');
- self::$scale = array('Zend_Locale_Math_PhpMath', 'Scale');
- self::$defaultScale = 0;
- self::$defaultPrecision = 1;
- }
- public static $defaultScale;
- public static $defaultPrecision;
- public static function Add($op1, $op2, $scale = null)
- {
- if ($scale === null) {
- $scale = Zend_Locale_Math_PhpMath::$defaultScale;
- $precision = Zend_Locale_Math_PhpMath::$defaultPrecision;
- } else {
- $precision = pow(10, -$scale);
- }
- if (empty($op1)) {
- $op1 = 0;
- }
- $op1 = self::normalize($op1);
- $op2 = self::normalize($op2);
- $result = $op1 + $op2;
- if (is_infinite($result) or (abs($result - $op2 - $op1) > $precision)) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("addition overflow: $op1 + $op2 != $result", $op1, $op2, $result);
- }
- return self::round(self::normalize($result), $scale);
- }
- public static function Sub($op1, $op2, $scale = null)
- {
- if ($scale === null) {
- $scale = Zend_Locale_Math_PhpMath::$defaultScale;
- $precision = Zend_Locale_Math_PhpMath::$defaultPrecision;
- } else {
- $precision = pow(10, -$scale);
- }
- if (empty($op1)) {
- $op1 = 0;
- }
- $op1 = self::normalize($op1);
- $op2 = self::normalize($op2);
- $result = $op1 - $op2;
- if (is_infinite($result) or (abs($result + $op2 - $op1) > $precision)) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("subtraction overflow: $op1 - $op2 != $result", $op1, $op2, $result);
- }
- return self::round(self::normalize($result), $scale);
- }
- public static function Pow($op1, $op2, $scale = null)
- {
- if ($scale === null) {
- $scale = Zend_Locale_Math_PhpMath::$defaultScale;
- }
- $op1 = self::normalize($op1);
- $op2 = self::normalize($op2);
- // BCMath extension doesn't use decimal part of the power
- // Provide the same behavior
- $op2 = ($op2 > 0) ? floor($op2) : ceil($op2);
- $result = pow($op1, $op2);
- if (is_infinite($result) or is_nan($result)) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("power overflow: $op1 ^ $op2", $op1, $op2, $result);
- }
- return self::round(self::normalize($result), $scale);
- }
- public static function Mul($op1, $op2, $scale = null)
- {
- if ($scale === null) {
- $scale = Zend_Locale_Math_PhpMath::$defaultScale;
- }
- if (empty($op1)) {
- $op1 = 0;
- }
- $op1 = self::normalize($op1);
- $op2 = self::normalize($op2);
- $result = $op1 * $op2;
- if (is_infinite($result) or is_nan($result)) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("multiplication overflow: $op1 * $op2 != $result", $op1, $op2, $result);
- }
- return self::round(self::normalize($result), $scale);
- }
- public static function Div($op1, $op2, $scale = null)
- {
- if ($scale === null) {
- $scale = Zend_Locale_Math_PhpMath::$defaultScale;
- }
- if (empty($op2)) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("can not divide by zero", $op1, $op2, null);
- }
- if (empty($op1)) {
- $op1 = 0;
- }
- $op1 = self::normalize($op1);
- $op2 = self::normalize($op2);
- $result = $op1 / $op2;
- if (is_infinite($result) or is_nan($result)) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("division overflow: $op1 / $op2 != $result", $op1, $op2, $result);
- }
- return self::round(self::normalize($result), $scale);
- }
- public static function Sqrt($op1, $scale = null)
- {
- if ($scale === null) {
- $scale = Zend_Locale_Math_PhpMath::$defaultScale;
- }
- if (empty($op1)) {
- $op1 = 0;
- }
- $op1 = self::normalize($op1);
- $result = sqrt($op1);
- if (is_nan($result)) {
- return NULL;
- }
- return self::round(self::normalize($result), $scale);
- }
- public static function Mod($op1, $op2)
- {
- if (empty($op1)) {
- $op1 = 0;
- }
- if (empty($op2)) {
- return NULL;
- }
- $op1 = self::normalize($op1);
- $op2 = self::normalize($op2);
- if ((int)$op2 == 0) {
- return NULL;
- }
- $result = $op1 % $op2;
- if (is_nan($result) or (($op1 - $result) % $op2 != 0)) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("modulus calculation error: $op1 % $op2 != $result", $op1, $op2, $result);
- }
- return self::normalize($result);
- }
- public static function Comp($op1, $op2, $scale = null)
- {
- if ($scale === null) {
- $scale = Zend_Locale_Math_PhpMath::$defaultScale;
- }
- if (empty($op1)) {
- $op1 = 0;
- }
- $op1 = self::normalize($op1);
- $op2 = self::normalize($op2);
- if ($scale <> 0) {
- $op1 = self::round($op1, $scale);
- $op2 = self::round($op2, $scale);
- } else {
- $op1 = ($op1 > 0) ? floor($op1) : ceil($op1);
- $op2 = ($op2 > 0) ? floor($op2) : ceil($op2);
- }
- if ($op1 > $op2) {
- return 1;
- } else if ($op1 < $op2) {
- return -1;
- }
- return 0;
- }
- public static function Scale($scale)
- {
- if ($scale > 9) {
- require_once 'Zend/Locale/Math/Exception.php';
- throw new Zend_Locale_Math_Exception("can not scale to precision $scale", $scale, null, null);
- }
- self::$defaultScale = $scale;
- self::$defaultPrecision = pow(10, -$scale);
- return true;
- }
- }
- Zend_Locale_Math_PhpMath::disable(); // disable use of bcmath functions