/*
 * Copyright (c) 2012 Mozilla Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

package nu.validator.checker;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class RdfaLiteChecker extends Checker {

    private static final String GUIDANCE = " Consider checking against the HTML5 + RDFa 1.1 schema instead.";

    private void warnNonRDFaLite(String localName, String att)
            throws SAXException {
        warn("RDFa Core attribute “" + att
                + "” is not allowed on the “" + localName
                + "” element in HTML5 + RDFa 1.1 Lite documents."
                + GUIDANCE);
    }

    /**
     * @see nu.validator.checker.Checker#startElement(java.lang.String,
     *      java.lang.String, java.lang.String, org.xml.sax.Attributes)
     */
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes atts) throws SAXException {

        if ("http://www.w3.org/1999/xhtml" != uri) {
            return;
        }

        int len = atts.getLength();
        for (int i = 0; i < len; i++) {
            String att = atts.getLocalName(i);
            if ("datatype" == att || "about" == att || "inlist" == att
                    || "rev" == att) {
                warn("RDFa Core attribute “" + att
                        + "” is not allowed in HTML5 + RDFa 1.1 Lite documents."
                        + GUIDANCE);
            } else if ("content" == att && "meta" != localName) {
                warnNonRDFaLite(localName, att);
            } else if (("rel" == att) && "a" != localName && "area" != localName
                    && "link" != localName) {
                warnNonRDFaLite(localName, att);
            }
        }
    }
}
