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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2015 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.serialize;

import net.sf.saxon.event.ProxyReceiver;
import net.sf.saxon.event.Receiver;
import net.sf.saxon.event.ReceiverOptions;
import net.sf.saxon.expr.parser.Location;
import net.sf.saxon.om.NodeName;
import net.sf.saxon.serialize.codenorm.Normalizer;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.util.FastStringBuffer;
import net.sf.saxon.type.SimpleType;
import net.sf.saxon.value.Whitespace;

/**
 * UnicodeNormalizer: This ProxyReceiver performs unicode normalization on the contents
 * of attribute and text nodes.
 *
 * @author Michael Kay
 */


public class UnicodeNormalizer extends ProxyReceiver {

    private Normalizer normalizer;

    public UnicodeNormalizer(String form, Receiver next) throws XPathException {
        super(next);
        byte fb;
        if (form.equals("NFC")) {
            fb = Normalizer.C;
        } else if (form.equals("NFD")) {
            fb = Normalizer.D;
        } else if (form.equals("NFKC")) {
            fb = Normalizer.KC;
        } else if (form.equals("NFKD")) {
            fb = Normalizer.KD;
        } else {
            XPathException err = new XPathException("Unknown normalization form " + form);
            err.setErrorCode("SESU0011");
            throw err;
        }

        normalizer = new Normalizer(fb, getConfiguration());
    }

    /**
     * Get the underlying normalizer
     * @return the underlying Normalizer
     */

    public Normalizer getNormalizer() {
        return normalizer;
    }

    /**
     * Output an attribute
     */

    public void attribute(NodeName nameCode, SimpleType typeCode, CharSequence value, Location locationId, int properties)
            throws XPathException {
        nextReceiver.attribute(nameCode, typeCode,
                               normalize(value, (properties & ReceiverOptions.USE_NULL_MARKERS) != 0), locationId, properties);
    }

    /**
     * Output character data
     */

    public void characters(/*@NotNull*/ CharSequence chars, Location locationId, int properties) throws XPathException {
        if (Whitespace.isWhite(chars)) {
            nextReceiver.characters(chars, locationId, properties);
        } else {
            nextReceiver.characters(normalize(chars, (properties & ReceiverOptions.USE_NULL_MARKERS) != 0), locationId, properties);
        }
    }

    private CharSequence normalize(CharSequence in, boolean containsNullMarkers) {
        if (containsNullMarkers) {
            FastStringBuffer out = new FastStringBuffer(in.length());
            String s = in.toString();
            int start = 0;
            int nextNull = s.indexOf((char)0);
            while (nextNull >= 0) {
                out.append(normalizer.normalize(s.substring(start, nextNull)));
                out.append((char) 0);
                start = nextNull + 1;
                nextNull = s.indexOf((char) 0, start);
                out.append(s.substring(start, nextNull));
                out.append((char) 0);
                start = nextNull + 1;
                nextNull = s.indexOf((char) 0, start);
            }
            out.append(normalizer.normalize(s.substring(start)));
            return out.condense();
        } else {
            return normalizer.normalize(in);
        }
    }

};