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PhortuneCurrency.php
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Fri, Mar 21, 16:51

PhortuneCurrency.php
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<?php
final class PhortuneCurrency extends Phobject {
private $value;
private $currency;
private function __construct() {
// Intentionally private.
}
public static function getDefaultCurrency() {
return 'USD';
}
public static function newEmptyCurrency() {
return self::newFromString('0.00 USD');
}
public static function newFromUserInput(PhabricatorUser $user, $string) {
// Eventually, this might select a default currency based on user settings.
return self::newFromString($string, self::getDefaultCurrency());
}
public static function newFromString($string, $default = null) {
$matches = null;
$ok = preg_match(
'/^([-$]*(?:\d+)?(?:[.]\d{0,2})?)(?:\s+([A-Z]+))?$/',
trim($string),
$matches);
if (!$ok) {
self::throwFormatException($string);
}
$value = $matches[1];
if (substr_count($value, '-') > 1) {
self::throwFormatException($string);
}
if (substr_count($value, '$') > 1) {
self::throwFormatException($string);
}
$value = str_replace('$', '', $value);
$value = (float)$value;
$value = (int)round(100 * $value);
$currency = idx($matches, 2, $default);
switch ($currency) {
case 'USD':
break;
default:
throw new Exception(pht("Unsupported currency '%s'!", $currency));
}
return self::newFromValueAndCurrency($value, $currency);
}
public static function newFromValueAndCurrency($value, $currency) {
$obj = new PhortuneCurrency();
$obj->value = $value;
$obj->currency = $currency;
return $obj;
}
public static function newFromList(array $list) {
assert_instances_of($list, __CLASS__);
if (!$list) {
return self::newEmptyCurrency();
}
$total = null;
foreach ($list as $item) {
if ($total === null) {
$total = $item;
} else {
$total = $total->add($item);
}
}
return $total;
}
public function formatForDisplay() {
$bare = $this->formatBareValue();
return '$'.$bare.' '.$this->currency;
}
public function serializeForStorage() {
return $this->formatBareValue().' '.$this->currency;
}
public function formatBareValue() {
switch ($this->currency) {
case 'USD':
return sprintf('%.02f', $this->value / 100);
default:
throw new Exception(
pht('Unsupported currency ("%s")!', $this->currency));
}
}
public function getValue() {
return $this->value;
}
public function getCurrency() {
return $this->currency;
}
public function getValueInUSDCents() {
if ($this->currency !== 'USD') {
throw new Exception(pht('Unexpected currency!'));
}
return $this->value;
}
private static function throwFormatException($string) {
throw new Exception(pht("Invalid currency format ('%s').", $string));
}
private function throwUnlikeCurrenciesException(PhortuneCurrency $other) {
throw new Exception(
pht(
'Trying to operate on unlike currencies ("%s" and "%s")!',
$this->currency,
$other->currency));
}
public function add(PhortuneCurrency $other) {
if ($this->currency !== $other->currency) {
$this->throwUnlikeCurrenciesException($other);
}
$currency = new PhortuneCurrency();
// TODO: This should check for integer overflows, etc.
$currency->value = $this->value + $other->value;
$currency->currency = $this->currency;
return $currency;
}
public function subtract(PhortuneCurrency $other) {
if ($this->currency !== $other->currency) {
$this->throwUnlikeCurrenciesException($other);
}
$currency = new PhortuneCurrency();
// TODO: This should check for integer overflows, etc.
$currency->value = $this->value - $other->value;
$currency->currency = $this->currency;
return $currency;
}
public function isEqualTo(PhortuneCurrency $other) {
if ($this->currency !== $other->currency) {
$this->throwUnlikeCurrenciesException($other);
}
return ($this->value === $other->value);
}
public function negate() {
$currency = new PhortuneCurrency();
$currency->value = -$this->value;
$currency->currency = $this->currency;
return $currency;
}
public function isPositive() {
return ($this->value > 0);
}
public function isGreaterThan(PhortuneCurrency $other) {
if ($this->currency !== $other->currency) {
$this->throwUnlikeCurrenciesException($other);
}
return $this->value > $other->value;
}
/**
* Assert that a currency value lies within a range.
*
* Throws if the value is not between the minimum and maximum, inclusive.
*
* In particular, currency values can be negative (to represent a debt or
* credit), so checking against zero may be useful to make sure a value
* has the expected sign.
*
* @param string|null Currency string, or null to skip check.
* @param string|null Currency string, or null to skip check.
* @return this
*/
public function assertInRange($minimum, $maximum) {
if ($minimum !== null && $maximum !== null) {
$min = self::newFromString($minimum);
$max = self::newFromString($maximum);
if ($min->value > $max->value) {
throw new Exception(
pht(
'Range (%s - %s) is not valid!',
$min->formatForDisplay(),
$max->formatForDisplay()));
}
}
if ($minimum !== null) {
$min = self::newFromString($minimum);
if ($min->value > $this->value) {
throw new Exception(
pht(
'Minimum allowed amount is %s.',
$min->formatForDisplay()));
}
}
if ($maximum !== null) {
$max = self::newFromString($maximum);
if ($max->value < $this->value) {
throw new Exception(
pht(
'Maximum allowed amount is %s.',
$max->formatForDisplay()));
}
}
return $this;
}
}

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