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<?php |
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/** |
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* PHP Units of Measure Library |
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* |
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* @link https://github.com/hiqdev/php-units |
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* @package php-units |
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* @license BSD-3-Clause |
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* @copyright Copyright (c) 2017-2018, HiQDev (http://hiqdev.com/) |
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*/ |
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namespace hiqdev\php\units\tree; |
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use hiqdev\php\units\ConverterInterface; |
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use hiqdev\php\units\exceptions\NotConvertibleException; |
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use hiqdev\php\units\UnitInterface; |
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/** |
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* Tree Converter. |
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* |
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* Uses node units to keep units info in a tree form: |
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* |
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* - bit: parent=bit factor = 1 |
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* - byte: parent=bit factor = 1 |
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* - megabyte: parent=byte factor = 10^6 = 1000000 |
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* - mebibyte: parent=byte factor = 2^20 = 1048576. |
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* |
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* - temperature: parent=temperature factor = 1 |
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* - celcius: parent=temperature factor = 1 |
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* - fahrenheit: parent=temperature method = function ($x) { return ($x-32)*5/9; } |
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* - kelvin: parent=temperature method = function ($x) { return $x+273.16; } |
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* |
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* @author Andrii Vasyliev <[email protected]> |
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*/ |
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class TreeConverter implements ConverterInterface |
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{ |
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private $data; |
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public function __construct($path = null) |
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{ |
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if ($path === null) { |
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$path = __DIR__ . '/../../res/units-tree.php'; |
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} |
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$this->data = require $path; |
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} |
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private function findData($name) |
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{ |
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if (!isset($this->data[$name])) { |
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return [ |
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'parent' => '', |
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'factor' => 1, |
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]; |
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} |
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return $this->data[$name]; |
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} |
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public function equals(UnitInterface $unit, UnitInterface $other) |
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{ |
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return $this->getNode($unit)->equals($other); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCalculator(UnitInterface $unit) |
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{ |
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return $this->getNode($unit)->getCalculator(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function isConvertible(UnitInterface $unit, UnitInterface $other) |
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{ |
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return $this->getNode($unit)->isConvertible($other); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMeasure(UnitInterface $unit) |
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{ |
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return $this->getNode($unit)->getMeasure(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function convert(UnitInterface $unit, UnitInterface $other, $quantity) |
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{ |
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return $this->getNode($unit)->convert($other, $quantity); |
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} |
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/** |
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* @var NodeUnit[] |
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*/ |
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private $nodes; |
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/** |
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* Returns tree unit by name or unit. |
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* @param string|UnitInterface |
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* @return NodeUnit |
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*/ |
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public function getNode($unit) |
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{ |
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$name = $unit instanceof UnitInterface ? $unit->getName() : $unit; |
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if (!isset($this->nodes[$name])) { |
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$this->nodes[$name] = $this->findNode($name); |
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} |
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return $this->nodes[$name]; |
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} |
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private function findNode($name) |
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{ |
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$data = $this->findData($name); |
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if (isset($data['parent'])) { |
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$parent = $data['parent']; |
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} else { |
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throw new NotConvertibleException("no parent for: $name"); |
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} |
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if ($parent === '') { |
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return new RootUnit($this, $name); |
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} |
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if (isset($data['method'])) { |
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$method = $data['method']; |
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} elseif (isset($data['factor'])) { |
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$method = $data['factor']; |
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} else { |
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throw new NotConvertibleException("no method for: $name"); |
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} |
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return new NodeUnit($this, $name, $this->getNode($parent), $method); |
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} |
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} |
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hiqdev /
php-units
