org.w3c.css.properties.css3.Css3Style cannot be cast to org.w3c.css.properties.svg.SVGBasicStyle

[sideshowbarker]

The CSS Validator results for checking https://www.hex.co.il/ with the default options show this:

org.w3c.css.properties.css3.Css3Style cannot be cast to org.w3c.css.properties.svg.SVGBasicStyle

The problem doesn’t occur if the profile value is css3svg; it occurs if it’s just css3.

When that happens, the stack trace for the underlying exception looks like this:

java.lang.ClassCastException: org.w3c.css.properties.css3.Css3Style cannot be cast to org.w3c.css.properties.svg.SVGBasicStyle
        at org.w3c.css.properties.css.CssWritingMode.addToStyle(CssWritingMode.java:84)
        at org.w3c.css.parser.CssStyle.setProperty(CssStyle.java:83)
        at org.w3c.css.parser.CssSelectors.addProperty(CssSelectors.java:314)
        at org.w3c.css.css.StyleSheet.addProperty(StyleSheet.java:94)
        at org.w3c.css.css.StyleSheetParser.handleRule(StyleSheetParser.java:96)
        at org.w3c.css.parser.CssFouffa.handleRule(CssFouffa.java:815)
        at org.w3c.css.parser.analyzer.CssParser.ruleSet(CssParser.java:2532)
        at org.w3c.css.parser.analyzer.CssParser.afterImportDeclaration(CssParser.java:669)
        at org.w3c.css.parser.analyzer.CssParser.parserUnit(CssParser.java:547)
        at org.w3c.css.parser.CssFouffa.parseStyle(CssFouffa.java:374)
        at org.w3c.css.css.StyleSheetParser.parseStyleElement(StyleSheetParser.java:316)
        at org.w3c.css.css.HTMLParserStyleSheetHandler.endElement(HTMLParserStyleSheetHandler.java:401)
        at nu.validator.saxtree.TreeParser.endElement(TreeParser.java:132)
        at nu.validator.saxtree.Element.revisit(Element.java:110)
        at nu.validator.saxtree.TreeParser.parse(TreeParser.java:95)
        at nu.validator.htmlparser.sax.HtmlParser.parse(HtmlParser.java:428)
        at org.w3c.css.css.HTMLParserStyleSheetHandler.parse(HTMLParserStyleSheetHandler.java:695)
        at org.w3c.css.css.DocumentParser.<init>(DocumentParser.java:153)
        at org.w3c.css.css.CssValidator.main(CssValidator.java:154)

The source that causes a ClassCastException exception to be thrown is here:

css-validator/org/w3c/css/properties/css/CssWritingMode.java

Lines 83 to 84 in 659374c

	public void addToStyle(ApplContext ac, CssStyle style) {
	SVGBasicStyle s = (SVGBasicStyle) style;

Apparently when profile is css3 and that code is reached, style’s an instance of Css3Style (and can’t be cast to SVGBasicStyle because that extends Css3Style, instead of the other way around).

And I notice that same SVGBasicStyle s = (SVGBasicStyle) style cast in 22 other classes in org/w3c/css/properties/css/…