Support expression in foreach stmt where the expression type structurally implements Iterator and a class extension exists that makes Iterable structural

[rsmckinney]

Support expression in foreach stmt where the expression type structurally implements Iterator and a class extension exists that makes Iterable structrual.

Enable Iterable as a structural interface .

package extensions.java.lang.Iterable;
. . .
@Extension
@Structural
public class StructuralIterable {
}

Make NodeList implement Iterable.

package extensions.org.w3c.dom.NodeList;
. . .
@Extension
public abstract class NodeListExt implements Iterable<Node> {
    public static Iterator<Node> iterator(@This NodeList thiz) {
        return new NodeListIterator(thiz);
    }

    public static Node get(@This NodeList thiz, int index) {
        return thiz.item(index);
    }
}

Use foreach statement with NodeList.

for (Node node : doc.documentElement.childNodes) {
  . . .
}

See slack discussion.

[rsmckinney]

Supported since release 2022.1.24.