--- /dev/null
+<?php
+
+/**
+ * Color
+ *
+ * @package Less
+ * @subpackage tree
+ */
+class Less_Tree_Color extends Less_Tree{
+ public $rgb;
+ public $alpha;
+ public $isTransparentKeyword;
+ public $type = 'Color';
+
+ public function __construct($rgb, $a = 1, $isTransparentKeyword = null ){
+
+ if( $isTransparentKeyword ){
+ $this->rgb = $rgb;
+ $this->alpha = $a;
+ $this->isTransparentKeyword = true;
+ return;
+ }
+
+ $this->rgb = array();
+ if( is_array($rgb) ){
+ $this->rgb = $rgb;
+ }else if( strlen($rgb) == 6 ){
+ foreach(str_split($rgb, 2) as $c){
+ $this->rgb[] = hexdec($c);
+ }
+ }else{
+ foreach(str_split($rgb, 1) as $c){
+ $this->rgb[] = hexdec($c.$c);
+ }
+ }
+ $this->alpha = is_numeric($a) ? $a : 1;
+ }
+
+ public function compile(){
+ return $this;
+ }
+
+ public function luma(){
+ $r = $this->rgb[0] / 255;
+ $g = $this->rgb[1] / 255;
+ $b = $this->rgb[2] / 255;
+
+ $r = ($r <= 0.03928) ? $r / 12.92 : pow((($r + 0.055) / 1.055), 2.4);
+ $g = ($g <= 0.03928) ? $g / 12.92 : pow((($g + 0.055) / 1.055), 2.4);
+ $b = ($b <= 0.03928) ? $b / 12.92 : pow((($b + 0.055) / 1.055), 2.4);
+
+ return 0.2126 * $r + 0.7152 * $g + 0.0722 * $b;
+ }
+
+ /**
+ * @see Less_Tree::genCSS
+ */
+ public function genCSS( $output ){
+ $output->add( $this->toCSS() );
+ }
+
+ public function toCSS( $doNotCompress = false ){
+ $compress = Less_Parser::$options['compress'] && !$doNotCompress;
+ $alpha = Less_Functions::fround( $this->alpha );
+
+
+ //
+ // If we have some transparency, the only way to represent it
+ // is via `rgba`. Otherwise, we use the hex representation,
+ // which has better compatibility with older browsers.
+ // Values are capped between `0` and `255`, rounded and zero-padded.
+ //
+ if( $alpha < 1 ){
+ if( ( $alpha === 0 || $alpha === 0.0 ) && isset($this->isTransparentKeyword) && $this->isTransparentKeyword ){
+ return 'transparent';
+ }
+
+ $values = array();
+ foreach($this->rgb as $c){
+ $values[] = Less_Functions::clamp( round($c), 255);
+ }
+ $values[] = $alpha;
+
+ $glue = ($compress ? ',' : ', ');
+ return "rgba(" . implode($glue, $values) . ")";
+ }else{
+
+ $color = $this->toRGB();
+
+ if( $compress ){
+
+ // Convert color to short format
+ if( $color[1] === $color[2] && $color[3] === $color[4] && $color[5] === $color[6]) {
+ $color = '#'.$color[1] . $color[3] . $color[5];
+ }
+ }
+
+ return $color;
+ }
+ }
+
+ //
+ // 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 string $op
+ */
+ public function operate( $op, $other) {
+ $rgb = array();
+ $alpha = $this->alpha * (1 - $other->alpha) + $other->alpha;
+ for ($c = 0; $c < 3; $c++) {
+ $rgb[$c] = Less_Functions::operate( $op, $this->rgb[$c], $other->rgb[$c]);
+ }
+ return new Less_Tree_Color($rgb, $alpha);
+ }
+
+ public function toRGB(){
+ return $this->toHex($this->rgb);
+ }
+
+ public function toHSL(){
+ $r = $this->rgb[0] / 255;
+ $g = $this->rgb[1] / 255;
+ $b = $this->rgb[2] / 255;
+ $a = $this->alpha;
+
+ $max = max($r, $g, $b);
+ $min = min($r, $g, $b);
+ $l = ($max + $min) / 2;
+ $d = $max - $min;
+
+ $h = $s = 0;
+ if( $max !== $min ){
+ $s = $l > 0.5 ? $d / (2 - $max - $min) : $d / ($max + $min);
+
+ switch ($max) {
+ case $r: $h = ($g - $b) / $d + ($g < $b ? 6 : 0); break;
+ case $g: $h = ($b - $r) / $d + 2; break;
+ case $b: $h = ($r - $g) / $d + 4; break;
+ }
+ $h /= 6;
+ }
+ return array('h' => $h * 360, 's' => $s, 'l' => $l, 'a' => $a );
+ }
+
+ //Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
+ public function toHSV() {
+ $r = $this->rgb[0] / 255;
+ $g = $this->rgb[1] / 255;
+ $b = $this->rgb[2] / 255;
+ $a = $this->alpha;
+
+ $max = max($r, $g, $b);
+ $min = min($r, $g, $b);
+
+ $v = $max;
+
+ $d = $max - $min;
+ if ($max === 0) {
+ $s = 0;
+ } else {
+ $s = $d / $max;
+ }
+
+ $h = 0;
+ if( $max !== $min ){
+ switch($max){
+ case $r: $h = ($g - $b) / $d + ($g < $b ? 6 : 0); break;
+ case $g: $h = ($b - $r) / $d + 2; break;
+ case $b: $h = ($r - $g) / $d + 4; break;
+ }
+ $h /= 6;
+ }
+ return array('h'=> $h * 360, 's'=> $s, 'v'=> $v, 'a' => $a );
+ }
+
+ public function toARGB(){
+ $argb = array_merge( (array) Less_Parser::round($this->alpha * 255), $this->rgb);
+ return $this->toHex( $argb );
+ }
+
+ public function compare($x){
+
+ if( !property_exists( $x, 'rgb' ) ){
+ return -1;
+ }
+
+
+ return ($x->rgb[0] === $this->rgb[0] &&
+ $x->rgb[1] === $this->rgb[1] &&
+ $x->rgb[2] === $this->rgb[2] &&
+ $x->alpha === $this->alpha) ? 0 : -1;
+ }
+
+ public function toHex( $v ){
+
+ $ret = '#';
+ foreach($v as $c){
+ $c = Less_Functions::clamp( Less_Parser::round($c), 255);
+ if( $c < 16 ){
+ $ret .= '0';
+ }
+ $ret .= dechex($c);
+ }
+
+ return $ret;
+ }
+
+
+ /**
+ * @param string $keyword
+ */
+ public static function fromKeyword( $keyword ){
+ $keyword = strtolower($keyword);
+
+ if( Less_Colors::hasOwnProperty($keyword) ){
+ // detect named color
+ return new Less_Tree_Color(substr(Less_Colors::color($keyword), 1));
+ }
+
+ if( $keyword === 'transparent' ){
+ return new Less_Tree_Color( array(0, 0, 0), 0, true);
+ }
+ }
+
+}
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