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<?php
namespace AmpProject;
/**
* Flexible unit of measure for CSS dimensions.
*
* Adapted from the `amp.validator.CssLength` class found in `validator.js` from the `ampproject/amphtml` project on
* GitHub.
*
* @version 1911070201440
* @link https://github.com/ampproject/amphtml/blob/1911070201440/validator/engine/validator.js#L3351
*
* @package ampproject/common
*/
final class CssLength
{
// Special attribute values.
const AUTO = 'auto';
const FLUID = 'fluid';
/**
* Whether the value or unit is invalid. Note that passing an empty value as `$attr_value` is considered valid.
*
* @var bool
*/
protected $isValid = false;
/**
* Whether the attribute value is set.
*
* @var bool
*/
protected $isDefined = false;
/**
* Whether the attribute value is 'auto'. This is a special value that indicates that the value gets derived from
* the context. In practice that's only ever the case for a width.
*
* @var bool
*/
protected $isAuto = false;
/**
* Whether the attribute value is 'fluid'.
*
* @var bool
*/
protected $isFluid = false;
/**
* The numeric value.
*
* @var float
*/
protected $numeral = 0;
/**
* The unit, 'px' being the default in case it's absent.
*
* @var string
*/
protected $unit = 'px';
/**
* Value of attribute.
*
* @var string
*/
protected $attrValue;
/**
* Instantiate a CssLength object.
*
* @param string|null $attrValue Attribute value to be parsed.
*/
public function __construct($attrValue)
{
if (null === $attrValue) {
$this->isValid = true;
return;
}
$this->attrValue = $attrValue;
$this->isDefined = true;
}
/**
* Validate the attribute value.
*
* @param bool $allowAuto Whether or not to allow the 'auto' value as a value.
* @param bool $allowFluid Whether or not to allow the 'fluid' value as a value.
*/
public function validate($allowAuto, $allowFluid)
{
if ($this->isValid()) {
return;
}
if (self::AUTO === $this->attrValue) {
$this->isAuto = true;
$this->isValid = $allowAuto;
return;
}
if (self::FLUID === $this->attrValue) {
$this->isFluid = true;
$this->isValid = $allowFluid;
}
$pattern = '/^(?<numeral>\d+(?:\.\d+)?)(?<unit>px|em|rem|vh|vw|vmin|vmax)?$/';
if (preg_match($pattern, $this->attrValue, $match)) {
$this->isValid = true;
$this->numeral = isset($match['numeral']) ? (float)$match['numeral'] : $this->numeral;
$this->unit = isset($match['unit']) ? $match['unit'] : $this->unit;
}
}
/**
* Whether or not the attribute value is valid.
*
* @return bool
*/
public function isValid()
{
return $this->isValid;
}
/**
* Whether the attribute value is set.
*
* @return bool
*/
public function isDefined()
{
return $this->isDefined;
}
/**
* Whether the attribute value is 'fluid'.
*
* @return bool
*/
public function isFluid()
{
return $this->isFluid;
}
/**
* Whether the attribute value is 'auto'.
*
* @return bool
*/
public function isAuto()
{
return $this->isAuto;
}
/**
* The unit of the attribute.
*
* @return string
*/
public function getUnit()
{
return $this->unit;
}
/**
* The numeral of the attribute.
*
* @return float
*/
public function getNumeral()
{
return $this->numeral;
}
}
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