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HtmlUnit adaptation of NekoHtml. It has the same functionality but exposing HTMLElements to be overridden.

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/*
 * Copyright Marc Guillemot
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.sourceforge.htmlunit.cyberneko;

import java.util.ArrayList;
import java.util.List;

import net.sourceforge.htmlunit.xerces.xni.Augmentations;
import net.sourceforge.htmlunit.xerces.xni.XMLDocumentHandler;
import net.sourceforge.htmlunit.xerces.xni.XMLString;

/**
 * Container for text that should be hold and re-feed later like text before <html> that will be re-feed
 * in <body>
 * @author Marc Guillemot
 */
class LostText
{
    /**
     * Pair of (text, augmentation)
     */
    static class Entry
    {
        private final XMLString text_;
        private Augmentations augs_;

        public Entry(final XMLString text, final Augmentations augs)
        {
            final char[] chars = new char[text.length];
            System.arraycopy(text.ch, text.offset, chars, 0, text.length);
            text_ = new XMLString(chars, 0, chars.length);
            if (augs != null)
                augs_ = new HTMLAugmentations(augs);
        }
    }
    private final List entries = new ArrayList<>();

    /**
     * Adds some text that need to be re-feed later. The information gets copied.
     */
    public void add(final XMLString text, final Augmentations augs)
    {
        if (!entries.isEmpty() || text.toString().trim().length() > 0)
            entries.add(new Entry(text, augs));
    }

    /**
     * Pushes the characters into the {@link XMLDocumentHandler}
     * @param tagBalancer the tag balancer that will receive the events
     */
    public void refeed(final XMLDocumentHandler tagBalancer) {
        for (final Entry entry : new ArrayList<>(entries)) {
            tagBalancer.characters(entry.text_, entry.augs_);
        }
        // not needed anymore once it has been used -> clear to free memory
        entries.clear();
    }

    /**
     * Indicates if this container contains something
     * @return true if no lost text has been collected
     */
    public boolean isEmpty() {
        return entries.isEmpty();
    }
}