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<?php
/**
* SCSSPHP
*
* @copyright 2012-2017 Leaf Corcoran
*
* @license http://opensource.org/licenses/MIT MIT
*
* @link http://leafo.github.io/scssphp
*/
namespace Leafo\ScssPhp\Node;
use Leafo\ScssPhp\Compiler;
use Leafo\ScssPhp\Node;
use Leafo\ScssPhp\Type;
/**
* Dimension + optional units
*
* {@internal
* This is a work-in-progress.
*
* The \ArrayAccess interface is temporary until the migration is complete.
* }}
*
* @author Anthon Pang <anthon.pang@gmail.com>
*/
class Number extends Node implements \ArrayAccess
{
/**
* @var integer
*/
static public $precision = 10;
/**
* @see http://www.w3.org/TR/2012/WD-css3-values-20120308/
*
* @var array
*/
static protected $unitTable = [
'in' => [
'in' => 1,
'pc' => 6,
'pt' => 72,
'px' => 96,
'cm' => 2.54,
'mm' => 25.4,
'q' => 101.6,
],
'turn' => [
'deg' => 360,
'grad' => 400,
'rad' => 6.28318530717958647692528676, // 2 * M_PI
'turn' => 1,
],
's' => [
's' => 1,
'ms' => 1000,
],
'Hz' => [
'Hz' => 1,
'kHz' => 0.001,
],
'dpi' => [
'dpi' => 1,
'dpcm' => 2.54,
'dppx' => 96,
],
];
/**
* @var integer|float
*/
public $dimension;
/**
* @var array
*/
public $units;
/**
* Initialize number
*
* @param mixed $dimension
* @param mixed $initialUnit
*/
public function __construct($dimension, $initialUnit)
{
$this->type = Type::T_NUMBER;
$this->dimension = $dimension;
$this->units = is_array($initialUnit)
? $initialUnit
: ($initialUnit ? [$initialUnit => 1]
: []);
}
/**
* Coerce number to target units
*
* @param array $units
*
* @return \Leafo\ScssPhp\Node\Number
*/
public function coerce($units)
{
if ($this->unitless()) {
return new Number($this->dimension, $units);
}
$dimension = $this->dimension;
foreach (static::$unitTable['in'] as $unit => $conv) {
$from = isset($this->units[$unit]) ? $this->units[$unit] : 0;
$to = isset($units[$unit]) ? $units[$unit] : 0;
$factor = pow($conv, $from - $to);
$dimension /= $factor;
}
return new Number($dimension, $units);
}
/**
* Normalize number
*
* @return \Leafo\ScssPhp\Node\Number
*/
public function normalize()
{
$dimension = $this->dimension;
$units = [];
$this->normalizeUnits($dimension, $units, 'in');
return new Number($dimension, $units);
}
/**
* {@inheritdoc}
*/
public function offsetExists($offset)
{
if ($offset === -3) {
return $this->sourceColumn !== null;
}
if ($offset === -2) {
return $this->sourceLine !== null;
}
if ($offset === -1
|| $offset === 0
|| $offset === 1
|| $offset === 2
) {
return true;
}
return false;
}
/**
* {@inheritdoc}
*/
public function offsetGet($offset)
{
switch ($offset) {
case -3:
return $this->sourceColumn;
case -2:
return $this->sourceLine;
case -1:
return $this->sourceIndex;
case 0:
return $this->type;
case 1:
return $this->dimension;
case 2:
return $this->units;
}
}
/**
* {@inheritdoc}
*/
public function offsetSet($offset, $value)
{
if ($offset === 1) {
$this->dimension = $value;
} elseif ($offset === 2) {
$this->units = $value;
} elseif ($offset == -1) {
$this->sourceIndex = $value;
} elseif ($offset == -2) {
$this->sourceLine = $value;
} elseif ($offset == -3) {
$this->sourceColumn = $value;
}
}
/**
* {@inheritdoc}
*/
public function offsetUnset($offset)
{
if ($offset === 1) {
$this->dimension = null;
} elseif ($offset === 2) {
$this->units = null;
} elseif ($offset === -1) {
$this->sourceIndex = null;
} elseif ($offset === -2) {
$this->sourceLine = null;
} elseif ($offset === -3) {
$this->sourceColumn = null;
}
}
/**
* Returns true if the number is unitless
*
* @return boolean
*/
public function unitless()
{
return ! array_sum($this->units);
}
/**
* Returns unit(s) as the product of numerator units divided by the product of denominator units
*
* @return string
*/
public function unitStr()
{
$numerators = [];
$denominators = [];
foreach ($this->units as $unit => $unitSize) {
if ($unitSize > 0) {
$numerators = array_pad($numerators, count($numerators) + $unitSize, $unit);
continue;
}
if ($unitSize < 0) {
$denominators = array_pad($denominators, count($denominators) + $unitSize, $unit);
continue;
}
}
return implode('*', $numerators) . (count($denominators) ? '/' . implode('*', $denominators) : '');
}
/**
* Output number
*
* @param \Leafo\ScssPhp\Compiler $compiler
*
* @return string
*/
public function output(Compiler $compiler = null)
{
$dimension = round($this->dimension, static::$precision);
$units = array_filter($this->units, function ($unitSize) {
return $unitSize;
});
if (count($units) > 1 && array_sum($units) === 0) {
$dimension = $this->dimension;
$units = [];
$this->normalizeUnits($dimension, $units, 'in');
$dimension = round($dimension, static::$precision);
$units = array_filter($units, function ($unitSize) {
return $unitSize;
});
}
$unitSize = array_sum($units);
if ($compiler && ($unitSize > 1 || $unitSize < 0 || count($units) > 1)) {
$compiler->throwError((string) $dimension . $this->unitStr() . " isn't a valid CSS value.");
}
reset($units);
$unit = key($units);
$dimension = number_format($dimension, static::$precision, '.', '');
return (static::$precision ? rtrim(rtrim($dimension, '0'), '.') : $dimension) . $unit;
}
/**
* {@inheritdoc}
*/
public function __toString()
{
return $this->output();
}
/**
* Normalize units
*
* @param integer|float $dimension
* @param array $units
* @param string $baseUnit
*/
private function normalizeUnits(&$dimension, &$units, $baseUnit = 'in')
{
$dimension = $this->dimension;
$units = [];
foreach ($this->units as $unit => $exp) {
if (isset(static::$unitTable[$baseUnit][$unit])) {
$factor = pow(static::$unitTable[$baseUnit][$unit], $exp);
$unit = $baseUnit;
$dimension /= $factor;
}
$units[$unit] = $exp + (isset($units[$unit]) ? $units[$unit] : 0);
}
}
}