Improve the selector validation to support % based steps in a keyframe definition

Author: raxbg

lib/Sabberworm/CSS/CSSList/CSSList.php

@@ -97,7 +97,7 @@ private static function parseListItem(ParserState $oParserState, CSSList $oList)
 				}
 			}
 		} else {
-			return DeclarationBlock::parse($oParserState);
+			return DeclarationBlock::parse($oParserState, $oList);
 		}
 	}
 

lib/Sabberworm/CSS/Property/KeyframeSelector.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Sabberworm\CSS\Property;
+
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
+class KeyframeSelector extends Selector {
+
+	//Regexes for specificity calculations
+
+	const SELECTOR_VALIDATION_RX = '/
+	^(
+		(?:
+			[a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="\'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters
+			(?:\\\\.)?                                              # a single escaped character
+			(?:([\'"]).*?(?<!\\\\)\2)?                              # a quoted text like [id="example"]
+		)*
+	)|
+	(\d+%i)                                                         # keyframe animation progress percentage (e.g. 50%)
+	$
+	/ux';
+
+}

lib/Sabberworm/CSS/Property/Selector.php

@@ -51,7 +51,7 @@ class Selector {
 	private $iSpecificity;
 
 	public static function isValid($sSelector) {
-		return preg_match(self::SELECTOR_VALIDATION_RX, $sSelector);
+		return preg_match(static::SELECTOR_VALIDATION_RX, $sSelector);
 	}
 
 	public function __construct($sSelector, $bCalculateSpecificity = false) {

lib/Sabberworm/CSS/RuleSet/DeclarationBlock.php

@@ -6,12 +6,14 @@
 use Sabberworm\CSS\Parsing\OutputException;
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 use Sabberworm\CSS\Property\Selector;
+use Sabberworm\CSS\Property\KeyframeSelector;
 use Sabberworm\CSS\Rule\Rule;
 use Sabberworm\CSS\Value\RuleValueList;
 use Sabberworm\CSS\Value\Value;
 use Sabberworm\CSS\Value\Size;
 use Sabberworm\CSS\Value\Color;
 use Sabberworm\CSS\Value\URL;
+use Sabberworm\CSS\CSSList\KeyFrame;
 
 /**
  * Declaration blocks are the parts of a css file which denote the rules belonging to a selector.
@@ -26,7 +28,7 @@ public function __construct($iLineNo = 0) {
 		$this->aSelectors = array();
 	}
 
-	public static function parse(ParserState $oParserState) {
+	public static function parse(ParserState $oParserState, $oList = NULL) {
 		$aComments = array();
 		$oResult = new DeclarationBlock($oParserState->currentLine());
 		try {
@@ -42,7 +44,7 @@ public static function parse(ParserState $oParserState) {
 					}
 				}
 			} while (!in_array($oParserState->peek(), array('{', '}')) || $sStringWrapperChar !== false);
-			$oResult->setSelector(implode('', $aSelectorParts));
+			$oResult->setSelector(implode('', $aSelectorParts), $oList);
 			if ($oParserState->comes('{')) {
 				$oParserState->consume(1);
 			}
@@ -62,18 +64,25 @@ public static function parse(ParserState $oParserState) {
 	}
 
 
-	public function setSelectors($mSelector) {
+	public function setSelectors($mSelector, $oList = NULL) {
 		if (is_array($mSelector)) {
 			$this->aSelectors = $mSelector;
 		} else {
 			$this->aSelectors = explode(',', $mSelector);
 		}
 		foreach ($this->aSelectors as $iKey => $mSelector) {
 			if (!($mSelector instanceof Selector)) {
-				if (!Selector::isValid($mSelector)) {
-					throw new UnexpectedTokenException("Selector did not match '" . Selector::SELECTOR_VALIDATION_RX . "'.", $mSelector, "custom");
+				if ($oList === NULL || !($oList instanceof KeyFrame)) {
+					if (!Selector::isValid($mSelector)) {
+						throw new UnexpectedTokenException("Selector did not match '" . Selector::SELECTOR_VALIDATION_RX . "'.", $mSelector, "custom");
+					}
+					$this->aSelectors[$iKey] = new Selector($mSelector);
+				} else {
+					if (!KeyframeSelector::isValid($mSelector)) {
+						throw new UnexpectedTokenException("Selector did not match '" . KeyframeSelector::SELECTOR_VALIDATION_RX . "'.", $mSelector, "custom");
+					}
+					$this->aSelectors[$iKey] = new KeyframeSelector($mSelector);
 				}
-				$this->aSelectors[$iKey] = new Selector($mSelector);
 			}
 		}
 	}
@@ -102,8 +111,8 @@ public function getSelector() {
 	/**
 	 * @deprecated use setSelectors()
 	 */
-	public function setSelector($mSelector) {
-		$this->setSelectors($mSelector);
+	public function setSelector($mSelector, $oList = NULL) {
+		$this->setSelectors($mSelector, $oList);
 	}
 
 	/**