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PhortuneCurrency.php
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Wed, Jan 8, 18:30

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, $default);
if ($currency) {
switch ($currency) {
case 'USD':
break;
default:
throw new Exception("Unsupported currency '{$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, 'PhortuneCurrency');
$total = 0;
$currency = null;
foreach ($list as $item) {
if ($currency === null) {
$currency = $item->getCurrency();
} else if ($currency === $item->getCurrency()) {
// Adding a value denominated in the same currency, which is
// fine.
} else {
throw new Exception(
pht('Trying to sum a list of unlike currencies.'));
}
// TODO: This should check for integer overflows, etc.
$total += $item->getValue();
}
return PhortuneCurrency::newFromValueAndCurrency(
$total,
self::getDefaultCurrency());
}
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 $this->currency;
}
private static function throwFormatException($string) {
throw new Exception("Invalid currency format ('{$string}').");
}
}

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