:nth-col() and :nth-last-col() per https://www.w3.org/TR/2018/WD-selectors-4-20181121/#nth-col-pseudo

Author: ylafon

org/w3c/css/parser/analyzer/CssParser.jj

@@ -775,6 +775,8 @@ TOKEN [IGNORE_CASE] :
     | <FUNCTIONHOSTCONTEXT   : "host-context("     >
     | <FUNCTIONNTHCHILD      : "nth-child("        >
     | <FUNCTIONNTHLASTCHILD  : "nth-last-child("   >
+    | <FUNCTIONNTHCOL        : "nth-col("          >
+    | <FUNCTIONNTHLASTCOL    : "nth-last-col("     >
     | <FUNCTIONNTHOFTYPE     : "nth-of-type("      >
     | <FUNCTIONNTHLASTOFTYPE : "nth-last-of-type(" >
     | <FUNCTIONNOT           : "not("              >
@@ -2797,6 +2799,17 @@ CssANPlusB anpb = null;
                                                 getBeginColumn(), getEndLine(), getEndColumn(), e));
                 }
 	    }
+	    | ( ( n=<FUNCTIONNTHCOL> | n=<FUNCTIONNTHLASTCOL> ) ( <S> )*
+		( ( anpb=anplusb() ( <S> )* ) | error_str=skip_to_matching_paren() ) ) {
+		try {
+			exp.addValue(anpb);
+                        s.setPseudoFun(ac, convertStringIndex(n.image, 0, n.image.length() -1, false).toLowerCase(), exp);
+                } catch(InvalidParamException e) {
+                        removeThisRule();
+                        ac.getFrame().addError(new CssError(getSourceFile(), getBeginLine(),
+                                                getBeginColumn(), getEndLine(), getEndColumn(), e));
+                }
+	    }
 	    | ( n=<FUNCTION> ( <S> )* param=expression() ) {
 		try {
 		    s.setPseudoFun(ac, convertStringIndex(n.image, 0, n.image.length() -1, false).toLowerCase(),
@@ -3852,6 +3865,8 @@ String skip_to_matching_paren() {
 	    case FUNCTIONSLOTTED:
 	    case FUNCTIONNTHCHILD:
 	    case FUNCTIONNTHLASTCHILD:
+	    case FUNCTIONNTHCOL:
+	    case FUNCTIONNTHLASTCOL:
 	    case FUNCTIONNTHOFTYPE:
 	    case FUNCTIONNTHLASTOFTYPE:
             case FUNCTIONNOT:

org/w3c/css/selectors/PseudoFactory.java

@@ -13,6 +13,7 @@
 import org.w3c.css.selectors.pseudofunctions.PseudoFunctionLang;
 import org.w3c.css.selectors.pseudofunctions.PseudoFunctionNot;
 import org.w3c.css.selectors.pseudofunctions.PseudoFunctionNthChild;
+import org.w3c.css.selectors.pseudofunctions.PseudoFunctionNthCol;
 import org.w3c.css.selectors.pseudofunctions.PseudoFunctionNthLastChild;
 import org.w3c.css.selectors.pseudofunctions.PseudoFunctionNthLastOfType;
 import org.w3c.css.selectors.pseudofunctions.PseudoFunctionNthOfType;
@@ -280,6 +281,12 @@ public static PseudoFunctionSelector newPseudoFunction(String name,
         if (name.equals("lang")) {
             return new PseudoFunctionLang(name, exp, ac);
         }
+        if (name.equals("nth-col")) {
+            return new PseudoFunctionNthCol(name, exp, ac);
+        }
+        if (name.equals("nth-last-col")) {
+            return new PseudoFunctionNthCol(name, exp, ac);
+        }
         throw new InvalidParamException("pseudo",
                 ":" + name, ac);
     }

org/w3c/css/selectors/pseudofunctions/PseudoFunctionNthCol.java

@@ -0,0 +1,40 @@
+//
+// Author: Yves Lafon <ylafon@w3.org>
+//
+// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2021.
+// Please first read the full copyright statement in file COPYRIGHT.html
+package org.w3c.css.selectors.pseudofunctions;
+
+import org.w3c.css.selectors.PseudoFunctionSelector;
+import org.w3c.css.util.ApplContext;
+import org.w3c.css.util.InvalidParamException;
+import org.w3c.css.values.CssANPlusB;
+import org.w3c.css.values.CssExpression;
+import org.w3c.css.values.CssTypes;
+import org.w3c.css.values.CssValue;
+
+/**
+ * PseudoFunctionNthCol
+ */
+public class PseudoFunctionNthCol extends PseudoFunctionSelector {
+
+    public PseudoFunctionNthCol(String name, CssExpression expression,
+                                ApplContext ac)
+            throws InvalidParamException {
+        CssANPlusB anpb = null;
+
+        setName(name);
+        if (expression == null || expression.getCount() == 0) {
+            throw new InvalidParamException("unrecognize", functionName(), ac);
+        }
+        CssValue val = expression.getValue();
+        if (val.getType() != CssTypes.CSS_ANPLUSB) {
+            throw new InvalidParamException("value", val.toString(), functionName(), ac);
+        }
+        anpb = (CssANPlusB) val;
+        expression.next();
+        setParam(anpb.toString());
+
+    }
+
+}

org/w3c/css/selectors/pseudofunctions/PseudoFunctionNthLastCol.java

@@ -0,0 +1,40 @@
+//
+// Author: Yves Lafon <ylafon@w3.org>
+//
+// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2021.
+// Please first read the full copyright statement in file COPYRIGHT.html
+package org.w3c.css.selectors.pseudofunctions;
+
+import org.w3c.css.selectors.PseudoFunctionSelector;
+import org.w3c.css.util.ApplContext;
+import org.w3c.css.util.InvalidParamException;
+import org.w3c.css.values.CssANPlusB;
+import org.w3c.css.values.CssExpression;
+import org.w3c.css.values.CssTypes;
+import org.w3c.css.values.CssValue;
+
+/**
+ * PseudoFunctionNthLastCol
+ */
+public class PseudoFunctionNthLastCol extends PseudoFunctionSelector {
+
+    public PseudoFunctionNthLastCol(String name, CssExpression expression,
+                                    ApplContext ac)
+            throws InvalidParamException {
+        CssANPlusB anpb = null;
+
+        setName(name);
+        if (expression == null || expression.getCount() == 0) {
+            throw new InvalidParamException("unrecognize", functionName(), ac);
+        }
+        CssValue val = expression.getValue();
+        if (val.getType() != CssTypes.CSS_ANPLUSB) {
+            throw new InvalidParamException("value", val.toString(), functionName(), ac);
+        }
+        anpb = (CssANPlusB) val;
+        expression.next();
+        setParam(anpb.toString());
+
+    }
+
+}