no.tornado.web.html.parser.StructuralEvaluator Maven / Gradle / Ivy

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A modern HTML5 Full Stack Web Framework that leverages Java 8 features for expressiveness and beautiful syntax.
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package no.tornado.web.html.parser;

import no.tornado.web.html.Element;

/**
 * Base structural evaluator.
 */
abstract class StructuralEvaluator extends Evaluator {
    Evaluator evaluator;

    static class Root extends Evaluator {
        public boolean matches(Element root, Element element) {
            return root == element;
        }
    }

    static class Has extends StructuralEvaluator {
        public Has(Evaluator evaluator) {
            this.evaluator = evaluator;
        }

        public boolean matches(Element root, Element element) {
            for (Object o : element.findRecursive(Element.class).toArray()) {
                Element e = (Element) o;
                if (e != element && evaluator.matches(root, e))
                    return true;
            }
            return false;
        }

        public String toString() {
            return String.format(":has(%s)", evaluator);
        }
    }

    static class Not extends StructuralEvaluator {
        public Not(Evaluator evaluator) {
            this.evaluator = evaluator;
        }

        public boolean matches(Element root, Element node) {
            return !evaluator.matches(root, node);
        }

        public String toString() {
            return String.format(":not%s", evaluator);
        }
    }

    static class Parent extends StructuralEvaluator {
        public Parent(Evaluator evaluator) {
            this.evaluator = evaluator;
        }

        public boolean matches(Element root, Element element) {
            if (root == element)
                return false;

            Element parent = element.parent();
            while (parent != root) {
                if (evaluator.matches(root, parent))
                    return true;
                parent = parent.parent();
            }
            return false;
        }

        public String toString() {
            return String.format(":parent%s", evaluator);
        }
    }

    static class ImmediateParent extends StructuralEvaluator {
        public ImmediateParent(Evaluator evaluator) {
            this.evaluator = evaluator;
        }

        public boolean matches(Element root, Element element) {
            if (root == element)
                return false;

            Element parent = element.parent();
            return parent != null && evaluator.matches(root, parent);
        }

        public String toString() {
            return String.format(":ImmediateParent%s", evaluator);
        }
    }

    static class PreviousSibling extends StructuralEvaluator {
        public PreviousSibling(Evaluator evaluator) {
            this.evaluator = evaluator;
        }

        public boolean matches(Element root, Element element) {
            if (root == element)
                return false;

            Element prev = element.prev();

            while (prev != null) {
                if (evaluator.matches(root, prev))
                    return true;

                prev = prev.prev();
            }
            return false;
        }

        public String toString() {
            return String.format(":prev*%s", evaluator);
        }
    }

    static class ImmediatePreviousSibling extends StructuralEvaluator {
        public ImmediatePreviousSibling(Evaluator evaluator) {
            this.evaluator = evaluator;
        }

        public boolean matches(Element root, Element element) {
            if (root == element)
                return false;

            Element prev = element.prev();
            return prev != null && evaluator.matches(root, prev);
        }

        public String toString() {
            return String.format(":prev%s", evaluator);
        }
    }
}