/**
* Operations have to be done per-channel, if not,
* channels will spill onto each other. Once we have
* our result, in the form of an integer triplet,
* we create a new color node to hold the result.
*
* @param Context $context
* @param string $op
* @param Node $other
* @return ColorNode
* @throws InvalidArgumentException
*/
public function operate(Context $context, $op, Node $other)
{
$result = [];
if (!$other instanceof ColorNode) {
if (!$other instanceof ToColorConvertibleInterface) {
throw new InvalidArgumentException('The other node must implement toColor() method to operate, see ILess\\Node\\Node_ToColorConvertibleInterface');
}
$other = $other->toColor();
if (!$other instanceof ColorNode) {
throw new InvalidArgumentException('The toColor() method must return an instance of ILess\\Node\\Node_Color');
}
}
$t = $this->getRGB();
$o = $other->getRGB();
for ($c = 0; $c < 3; $c++) {
$result[$c] = Math::operate($op, $t[$c], $o[$c]);
if ($result[$c] > 255) {
$result[$c] = 255;
} elseif ($result < 0) {
$result[$c] = 0;
}
}
return new ColorNode($result, $this->value->getAlpha() + $other->value->getAlpha());
}
/**
* @covers round
* @dataProvider getDataForRoundTest
*/
public function testRound($value, $precision, $expected)
{
$this->assertEquals($expected, Math::round($value, $precision), sprintf('Rounding of "%s" with precision "%s" works', $value, $precision));
}
/**
* Returns the 'value' channel of @color in the HSV space
*
* @param ColorNode $color
* @return string
*/
public function hsvvalue(Node $color)
{
if (!$color instanceof ColorNode) {
return $color;
}
$hsv = $color->toHSV();
return new DimensionNode(Math::round($hsv['v'] * 100), '%');
}
/**
* Round the value using the `$context->precision` setting.
*
* @param Context $context
* @param mixed $value
*
* @return string
*/
public static function round(Context $context, $value)
{
// add "epsilon" to ensure numbers like 1.000000005 (represented as 1.000000004999....) are properly rounded...
return $context->numPrecision === null ? $value : Math::toFixed($value + 2.0E-16, $context->numPrecision);
}
/**
* Returns the color as HEX string (when transparency present, in RGBA model)
*
* @param boolean $compress Compress the color?
* @param boolean $canShorten Can the color be shortened if possible?
* @return string
*/
public function toString($compress = false, $canShorten = false)
{
if ($this->isTransparentKeyword) {
return 'transparent';
}
if ($this->originalForm) {
return $this->originalForm;
}
$alpha = Math::toFixed($this->alpha + 2.0E-16, 8);
if ($alpha < 1) {
$fixedRGB = $this->getFixedRGB();
return sprintf('rgba(%s)', join($compress ? ',' : ', ', [$fixedRGB[0], $fixedRGB[1], $fixedRGB[2], Math::clean($this->clamp($alpha, 1))]));
}
// prevent named colors
if ($this->keyword) {
return $this->keyword;
}
$color = [];
foreach ($this->getFixedRgb() as $i) {
$color[] = str_pad(dechex(Math::round($i)), 2, '0', STR_PAD_LEFT);
}
$color = join('', $color);
// convert color to short format
if ($canShorten && $color[0] === $color[1] && $color[2] === $color[3] && $color[4] === $color[5]) {
$color = $color[0] . $color[2] . $color[4];
}
$color = '#' . $color;
return $color;
}
/**
* Operates with the dimension. In an operation between two dimensions,
* we default to the first Dimension's unit,
* so `1px + 2` will yield `3px`.
*
* @param Context $context
* @param string $op
* @param DimensionNode $other
* @return DimensionNode
* @throws CompilerException
*/
public function operate(Context $context, $op, DimensionNode $other)
{
$value = Math::operate($op, $this->value, $other->value);
$unit = clone $this->unit;
if ($op === '+' || $op === '-') {
if (!count($unit->numerator) && !count($unit->denominator)) {
$unit = clone $other->unit;
if ($this->unit->backupUnit) {
$unit->backupUnit = $this->unit->backupUnit;
}
} elseif (!count($other->unit->numerator) && !count($other->unit->denominator)) {
// do nothing
} else {
$other = $other->convertTo($this->unit->usedUnits());
if ($context->strictUnits && $other->unit->toString() !== $unit->toString()) {
throw new CompilerException(sprintf('Incompatible units. Change the units or use the unit function. Bad units: \'%s\' and \'%s\'.', $unit->toString(), $other->unit->toString()));
}
$value = Math::operate($op, $this->value, $other->value);
}
} elseif ($op === '*') {
$unit->numerator = array_merge($unit->numerator, $other->unit->numerator);
$unit->denominator = array_merge($unit->denominator, $other->unit->denominator);
sort($unit->numerator);
sort($unit->denominator);
$unit->cancel();
} elseif ($op === '/') {
$unit->numerator = array_merge($unit->numerator, $other->unit->denominator);
$unit->denominator = array_merge($unit->denominator, $other->unit->numerator);
sort($unit->numerator);
sort($unit->denominator);
$unit->cancel();
}
return new DimensionNode($value, $unit);
}
