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<?php

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namespace AmpProject;

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/**

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* Flexible unit of measure for CSS dimensions.

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* Adapted from the `amp.validator.CssLength` class found in `validator.js` from the `ampproject/amphtml` project on

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* GitHub.

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* @version 1911070201440

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* @link https://github.com/ampproject/amphtml/blob/1911070201440/validator/engine/validator.js#L3351

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* @package ampproject/amp-toolbox

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final class CssLength

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{

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// Special attribute values.

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const AUTO = 'auto';

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const FLUID = 'fluid';

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/**

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* Whether the value or unit is invalid. Note that passing an empty value as `$attr_value` is considered valid.

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* @var bool

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protected $isValid = false;

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/**

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* Whether the attribute value is set.

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* @var bool

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protected $isDefined = false;

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/**

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* Whether the attribute value is 'auto'. This is a special value that indicates that the value gets derived from

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* the context. In practice that's only ever the case for a width.

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* @var bool

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protected $isAuto = false;

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/**

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* Whether the attribute value is 'fluid'.

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* @var bool

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protected $isFluid = false;

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/**

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* The numeric value.

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* @var float

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protected $numeral = 0;

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/**

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* The unit, 'px' being the default in case it's absent.

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* @var string

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protected $unit = 'px';

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/**

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* Value of attribute.

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* @var string

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protected $attrValue;

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/**

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* Instantiate a CssLength object.

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* @param string|null $attrValue Attribute value to be parsed.

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public function __construct($attrValue)

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{

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if (null === $attrValue) {

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$this->isValid = true;

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return;

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}

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$this->attrValue = $attrValue;

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$this->isDefined = true;

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}

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/**

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* Validate the attribute value.

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* @param bool $allowAuto Whether or not to allow the 'auto' value as a value.

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* @param bool $allowFluid Whether or not to allow the 'fluid' value as a value.

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public function validate($allowAuto, $allowFluid)

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{

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if ($this->isValid()) {

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return;

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}

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if (self::AUTO === $this->attrValue) {

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$this->isAuto = true;

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$this->isValid = $allowAuto;

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return;

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}

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if (self::FLUID === $this->attrValue) {

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$this->isFluid = true;

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$this->isValid = $allowFluid;

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}

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$pattern = '/^(?<numeral>\d+(?:\.\d+)?)(?<unit>px|em|rem|vh|vw|vmin|vmax)?$/';

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if (preg_match($pattern, $this->attrValue, $match)) {

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$this->isValid = true;

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$this->numeral = isset($match['numeral']) ? (float)$match['numeral'] : $this->numeral;

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$this->unit = isset($match['unit']) ? $match['unit'] : $this->unit;

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}

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}

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/**

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* Whether or not the attribute value is valid.

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* @return bool

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public function isValid()

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{

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return $this->isValid;

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}

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/**

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* Whether the attribute value is set.

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* @return bool

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public function isDefined()

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{

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return $this->isDefined;

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}

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/**

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* Whether the attribute value is 'fluid'.

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* @return bool

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public function isFluid()

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{

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return $this->isFluid;

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}

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/**

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* Whether the attribute value is 'auto'.

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* @return bool

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public function isAuto()

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{

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return $this->isAuto;

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}

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/**

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* The unit of the attribute.

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* @return string

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public function getUnit()

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{

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return $this->unit;

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}

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/**

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* The numeral of the attribute.

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* @return float

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public function getNumeral()

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{

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return $this->numeral;

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}

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}

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