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

Part of MDL-55071

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

@@ -0,0 +1,31 @@
+<?php
+
+namespace Sabberworm\CSS\Value;
+
+
+class URL extends PrimitiveValue {
+
+	private $oURL;
+
+	public function __construct(CSSString $oURL, $iLineNo = 0) {
+		parent::__construct($iLineNo);
+		$this->oURL = $oURL;
+	}
+
+	public function setURL(CSSString $oURL) {
+		$this->oURL = $oURL;
+	}
+
+	public function getURL() {
+		return $this->oURL;
+	}
+
+	public function __toString() {
+		return $this->render(new \Sabberworm\CSS\OutputFormat());
+	}
+
+	public function render(\Sabberworm\CSS\OutputFormat $oOutputFormat) {
+		return "url({$this->oURL->render($oOutputFormat)})";
+	}
+
+}