Adding support to @keyframes rule

lib/Sabberworm/CSS/CSSList/KeyFrame.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Sabberworm\CSS\CSSList;
+
+
+class KeyFrame extends CSSList {
+
+	private $vendorKeyFrame;
+	private $animationName;
+
+	public function __construct() {
+		parent::__construct();
+		$this->vendorKeyFrame = null;
+		$this->animationName  = null;
+	}
+
+	public function setVendorKeyFrame($vendorKeyFrame) {
+		$this->vendorKeyFrame = $vendorKeyFrame;
+	}
+
+	public function getVendorKeyFrame() {
+		return $this->vendorKeyFrame;
+	}
+
+	public function setAnimationName($animationName) {
+		$this->animationName = $animationName;
+	}
+
+	public function getAnimationName() {
+		return $this->animationName;
+	}
+
+	public function __toString() {
+		$sResult = "@{$this->vendorKeyFrame} {$this->animationName} {";
+		$sResult .= parent::__toString();
+		$sResult .= '}';
+		return $sResult;
+	}
+
+}

lib/Sabberworm/CSS/Parser.php

@@ -5,6 +5,7 @@
 use Sabberworm\CSS\CSSList\CSSList;
 use Sabberworm\CSS\CSSList\Document;
 use Sabberworm\CSS\CSSList\MediaQuery;
+use Sabberworm\CSS\CSSList\Keyframe;
 use Sabberworm\CSS\Property\Import;
 use Sabberworm\CSS\Property\Charset;
 use Sabberworm\CSS\RuleSet\AtRule;
@@ -88,7 +89,16 @@ private function parseAtRule() {
 		$this->consume('@');
 		$sIdentifier = $this->parseIdentifier();
 		$this->consumeWhiteSpace();
-		if ($sIdentifier === 'media') {
+		if($sIdentifier == '-webkit-keyframes' || $sIdentifier == '-moz-keyframes' || $sIdentifier == '-ms-keyframes' || $sIdentifier == '-o-keyframes' || $sIdentifier == 'keyframes') {
+			$oResult = new KeyFrame();
+			$oResult->setVendorKeyFrame($sIdentifier);
+			$oResult->setAnimationName(trim($this->consumeUntil('{')));
+			$this->consume('{');
+			$this->consumeWhiteSpace();
+			$this->parseList($oResult);
+			return $oResult;
+
+		} else if ($sIdentifier === 'media') {
 			$oResult = new MediaQuery();
 			$oResult->setQuery(trim($this->consumeUntil('{')));
 			$this->consume('{');