protected static function colorAdjust($color, array $adjustments)
{
$fn_matched = preg_match('!^(#|rgba?)!', $color, $m);
$keywords = CssCrush_Color::getKeywords();
// Support for Hex, RGB, RGBa and keywords
// HSL and HSLa are passed over
if ($fn_matched or array_key_exists($color, $keywords)) {
$alpha = null;
$rgb = null;
// Get an RGB value from the color argument
if ($fn_matched) {
switch ($m[1]) {
case '#':
$rgb = CssCrush_Color::hexToRgb($color);
break;
case 'rgb':
case 'rgba':
$rgba = $m[1] == 'rgba' ? true : false;
$rgb = substr($color, $rgba ? 5 : 4);
$rgb = substr($rgb, 0, strlen($rgb) - 1);
$rgb = array_map('trim', explode(',', $rgb));
$alpha = $rgba ? array_pop($rgb) : null;
$rgb = CssCrush_Color::normalizeCssRgb($rgb);
break;
}
} else {
$rgb = $keywords[$color];
}
$hsl = CssCrush_Color::rgbToHsl($rgb);
// Clean up adjustment parameters to floating point numbers
// Calculate the new HSL value
$counter = 0;
foreach ($adjustments as &$_val) {
$index = $counter++;
$_val = $_val ? trim(str_replace('%', '', $_val)) : 0;
// Reduce value to float
$_val /= 100;
// Calculate new HSL value
$hsl[$index] = max(0, min(1, $hsl[$index] + $_val));
}
// Finally convert new HSL value to RGB
$rgb = CssCrush_Color::hslToRgb($hsl);
// Return as hex if there is no alpha channel
// Otherwise return RGBa string
if (is_null($alpha)) {
return CssCrush_Color::rgbToHex($rgb);
}
$rgb[] = $alpha;
return 'rgba(' . implode(',', $rgb) . ')';
} else {
return $color;
}
}
function csscrush_hsl(CssCrush_Rule $rule)
{
foreach ($rule as &$declaration) {
if (!$declaration->skip and (!empty($declaration->functions) and in_array('hsl', $declaration->functions))) {
while (preg_match('!hsl(___p\\d+___)!', $declaration->value, $m)) {
$full_match = $m[0];
$token = $m[1];
$hsl = trim($rule->parens[$token], '()');
$hsl = array_map('trim', explode(',', $hsl));
$rgb = CssCrush_Color::cssHslToRgb($hsl);
$hex = CssCrush_Color::rgbToHex($rgb);
$declaration->value = str_replace($full_match, $hex, $declaration->value);
}
}
}
}