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

Part of MDL-55071

lib/php-css-parser/Property/Import.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+use Sabberworm\CSS\Value\URL;
+
+/**
+* Class representing an @import rule.
+*/
+class Import implements AtRule {
+	private $oLocation;
+	private $sMediaQuery;
+	protected $iLineNo;
+	protected $aComments;
+	
+	public function __construct(URL $oLocation, $sMediaQuery, $iLineNo = 0) {
+		$this->oLocation = $oLocation;
+		$this->sMediaQuery = $sMediaQuery;
+		$this->iLineNo = $iLineNo;
+		$this->aComments = array();
+	}
+
+	/**
+	 * @return int
+	 */
+	public function getLineNo() {
+		return $this->iLineNo;
+	}
+
+	public function setLocation($oLocation) {
+			$this->oLocation = $oLocation;
+	}
+
+	public function getLocation() {
+			return $this->oLocation;
+	}
+	
+	public function __toString() {
+		return $this->render(new \Sabberworm\CSS\OutputFormat());
+	}
+
+	public function render(\Sabberworm\CSS\OutputFormat $oOutputFormat) {
+		return "@import ".$this->oLocation->render($oOutputFormat).($this->sMediaQuery === null ? '' : ' '.$this->sMediaQuery).';';
+	}
+
+	public function atRuleName() {
+		return 'import';
+	}
+
+	public function atRuleArgs() {
+		$aResult = array($this->oLocation);
+		if($this->sMediaQuery) {
+			array_push($aResult, $this->sMediaQuery);
+		}
+		return $aResult;
+	}
+
+	public function addComments(array $aComments) {
+		$this->aComments = array_merge($this->aComments, $aComments);
+	}
+
+	public function getComments() {
+		return $this->aComments;
+	}
+
+	public function setComments(array $aComments) {
+		$this->aComments = $aComments;
+	}
+}