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

Part of MDL-55071

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

@@ -0,0 +1,40 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+class CSSFunction extends ValueList {
+
+	private $sName;
+
+	public function __construct($sName, $aArguments, $sSeparator = ',', $iLineNo = 0) {
+		if($aArguments instanceof RuleValueList) {
+			$sSeparator = $aArguments->getListSeparator();
+			$aArguments = $aArguments->getListComponents();
+		}
+		$this->sName = $sName;
+		$this->iLineNo = $iLineNo;
+		parent::__construct($aArguments, $sSeparator, $iLineNo);
+	}
+
+	public function getName() {
+		return $this->sName;
+	}
+
+	public function setName($sName) {
+		$this->sName = $sName;
+	}
+
+	public function getArguments() {
+		return $this->aComponents;
+	}
+
+	public function __toString() {
+		return $this->render(new \Sabberworm\CSS\OutputFormat());
+	}
+
+	public function render(\Sabberworm\CSS\OutputFormat $oOutputFormat) {
+		$aArguments = parent::render($oOutputFormat);
+		return "{$this->sName}({$aArguments})";
+	}
+
+}