/**
* Apply the plugin to Css object
*
* @param Stylecow\Css $css The css object
*/
public static function apply(Css $css)
{
$css->executeRecursive(function ($code) {
foreach ($code->getProperties() as $property) {
$property->executeFunction('color', function ($parameters) {
$rgba = Color::toRGBA(array_shift($parameters));
foreach ($parameters as $operation) {
if (strpos($operation, ':') === false) {
if (preg_match('/^[0-9]+$/', $operation)) {
$function = 'tint';
$value = $operation;
} else {
continue;
}
} else {
list($function, $value) = Parser::explodeTrim(':', $operation, 2);
}
switch ($function) {
case 'hue':
case 'saturation':
case 'light':
$rgba = Color::HSLA_RGBA(Color::editChannel(Color::RGBA_HSLA($rgba), $function, $value));
break;
case 'red':
case 'green':
case 'blue':
case 'alpha':
$rgba = Color::editChannel($rgba, $function, $value);
break;
case 'tint':
$rgba = Color::editTint($rgba, $value);
break;
}
}
if ($rgba[3] < 1) {
return 'rgba(' . implode(', ', $rgba) . ')';
}
return '#' . Color::RGBA_HEX($rgba);
});
}
});
}
/**
* Converts a color declaration in rgba format.
*
* @param string $colors The css color declaration
*
* @return array The rgba color values
*/
public static function resolveColor($colors)
{
$colors = Parser::explodeTrim(' ', $colors);
if (count($colors) === 1) {
return Color::toRGBA($colors[0]);
}
$sumColors = array(0, 0, 0, 0);
foreach ($colors as $k => $color) {
$color = Color::toRGBA($color);
$sumColors[0] += $color[0];
$sumColors[1] += $color[1];
$sumColors[2] += $color[2];
$sumColors[3] += $color[3];
}
$total = count($colors);
$sumColors[0] = round($sumColors[0] / $total);
$sumColors[1] = round($sumColors[1] / $total);
$sumColors[2] = round($sumColors[2] / $total);
$sumColors[3] = round($sumColors[3] / $total);
return $sumColors;
}
/**
* Generate the Ie filter to emulate the rotation of an element: background: linear-gradient(top, #333, #999);
*
* @param array &$code The piece of the parsed code
* @param array $params The linear gradient parameters
*/
public static function getLinearGradientFilter($params)
{
$point = 'top';
$direction = null;
if (preg_match('/(top|bottom|left|right|deg)/', $params[0])) {
$point = array_shift($params);
}
switch ($point) {
case 'top':
case '90deg':
$direction = 'vertical';
$reverse = false;
break;
case 'bottom':
case '-90deg':
$direction = 'vertical';
$reverse = true;
break;
case 'left':
case '180deg':
case '-180deg':
$direction = 'horizontal';
$reverse = false;
break;
case 'right':
case '0deg':
case '360deg':
$direction = 'vertical';
$reverse = true;
break;
}
$colors = $params;
if (isset($direction) && count($colors) === 2) {
$colors[0] = Color::RGBA_HEX(Color::toRGBA($colors[0]));
$colors[1] = Color::RGBA_HEX(Color::toRGBA($colors[1]));
if ($reverse) {
$colors = array_reverse($colors);
}
if ($direction === 'horizontal') {
return 'progid:DXImageTransform.Microsoft.gradient(startColorStr=\'#' . $colors[0] . '\', endColorStr=\'#' . $colors[1] . '\', GradientType=1)';
} else {
return 'progid:DXImageTransform.Microsoft.gradient(startColorStr=\'#' . $colors[0] . '\', endColorStr=\'#' . $colors[1] . '\')';
}
}
}
/**
* Generate the Ie filter to emulate the background hsla color of an element: background: hsla(0, 0, 0, 0.5);
*
* @param array $params The rgba parameters
*/
public static function getHSLAFilter($params)
{
return self::getRGBAFilter(Color::HSLA_RGBA($params));
}
