MDL-55224 core: Import PHP-CSS-Parser into core

Part of MDL-55071

lib/php-css-parser/Value/Color.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+class Color extends CSSFunction {
+
+	public function __construct($aColor, $iLineNo = 0) {
+		parent::__construct(implode('', array_keys($aColor)), $aColor, ',', $iLineNo);
+	}
+
+	public function getColor() {
+		return $this->aComponents;
+	}
+
+	public function setColor($aColor) {
+		$this->setName(implode('', array_keys($aColor)));
+		$this->aComponents = $aColor;
+	}
+
+	public function getColorDescription() {
+		return $this->getName();
+	}
+
+	public function __toString() {
+		return $this->render(new \Sabberworm\CSS\OutputFormat());
+	}
+
+	public function render(\Sabberworm\CSS\OutputFormat $oOutputFormat) {
+		// Shorthand RGB color values
+		if($oOutputFormat->getRGBHashNotation() && implode('', array_keys($this->aComponents)) === 'rgb') {
+			$sResult = sprintf(
+				'%02x%02x%02x',
+				$this->aComponents['r']->getSize(),
+				$this->aComponents['g']->getSize(),
+				$this->aComponents['b']->getSize()
+			);
+			return '#'.(($sResult[0] == $sResult[1]) && ($sResult[2] == $sResult[3]) && ($sResult[4] == $sResult[5]) ? "$sResult[0]$sResult[2]$sResult[4]" : $sResult);
+		}
+		return parent::render($oOutputFormat);
+	}
+}