public function testGetGroup()
{
$group = \ILess\Util\UnitConversion::getGroup('length');
$this->assertInternalType('array', $group);
$group = \ILess\Util\UnitConversion::getGroup('duration');
$this->assertInternalType('array', $group);
$group = \ILess\Util\UnitConversion::getGroup('angle');
$this->assertInternalType('array', $group);
$group = \ILess\Util\UnitConversion::getGroup('invalid');
$this->assertInternalType('null', $group);
}
public function usedUnits()
{
$result = [];
foreach (UnitConversion::getGroups() as $groupName) {
$group = UnitConversion::getGroup($groupName);
for ($i = 0; $i < count($this->numerator); ++$i) {
$atomicUnit = $this->numerator[$i];
if (isset($group[$atomicUnit]) && !isset($result[$groupName])) {
$result[$groupName] = $atomicUnit;
}
}
for ($i = 0; $i < count($this->denominator); ++$i) {
$atomicUnit = $this->denominator[$i];
if (isset($group[$atomicUnit]) && !isset($result[$groupName])) {
$result[$groupName] = $atomicUnit;
}
}
}
return $result;
}
/**
* Converts to another unit
*
* @param array|string $conversions
* @return DimensionNode
*/
public function convertTo($conversions)
{
$value = $this->value;
$unit = clone $this->unit;
if (is_string($conversions)) {
$derivedConversions = [];
foreach (UnitConversion::getGroups() as $i) {
$group = UnitConversion::getGroup($i);
if (isset($group[$conversions])) {
$derivedConversions = [$i => $conversions];
}
}
$conversions = $derivedConversions;
}
foreach ($conversions as $groupName => $targetUnit) {
$group = UnitConversion::getGroup($groupName);
// numerator
for ($i = 0, $count = count($unit->numerator); $i < $count; $i++) {
$atomicUnit = $unit->numerator[$i];
if (is_object($atomicUnit)) {
continue;
}
if (!isset($group[$atomicUnit])) {
continue;
}
$value = $value * $group[$atomicUnit] / $group[$targetUnit];
$unit->numerator[$i] = $targetUnit;
}
// denominator
for ($i = 0, $count = count($unit->denominator); $i < $count; $i++) {
$atomicUnit = $unit->denominator[$i];
if (!isset($group[$atomicUnit])) {
continue;
}
$value = $value / ($group[$atomicUnit] / $group[$targetUnit]);
$unit->denominator[$i] = $targetUnit;
}
}
$unit->cancel();
return new DimensionNode($value, $unit);
}