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The DSI utilities are a mishmash of classes accumulated during the last twenty years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.

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package it.unimi.dsi.parser.callback;

/*
 * DSI utilities
 *
 * Copyright (C) 2005-2019 Sebastiano Vigna
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by the Free
 *  Software Foundation; either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  This library is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, see .
 *
 */

import it.unimi.dsi.lang.MutableString;
import it.unimi.dsi.parser.Attribute;
import it.unimi.dsi.parser.BulletParser;
import it.unimi.dsi.parser.Element;

import java.util.Map;

/** A callback extracting text and titles.
 *
 * This callbacks extracts all text in the page, and the title.
 * The resulting
 * text is available through {@link #text}, and the title through {@link #title}.
 *
 * Note that {@link #text} and {@link #title} are never trimmed.
 */


public class TextExtractor extends DefaultCallback {

	/** The text resulting from the parsing process. */
	public final MutableString text = new MutableString();
	/** The title resulting from the parsing process. */
	public final MutableString title = new MutableString();
	/** True if we are in the middle of the title. */
	private boolean inTitle;

	/**
	 * Configure the parser to parse text.
	 */

	@Override
	public void configure(final BulletParser parser) {
		parser.parseText(true);
		// To get the title.
		parser.parseTags(true);
	}

	@Override
	public void startDocument() {
		text.length(0);
		title.length(0);
		inTitle = false;
	}

	@Override
	public boolean characters(final char[] characters, final int offset, final int length, final boolean flowBroken) {
		text.append(characters, offset, length);
		if (inTitle) title.append(characters, offset, length);
		return true;
	}

	@Override
	public boolean endElement(final Element element) {
		// No element is allowed inside a title.
		inTitle = false;
		if (element.breaksFlow) {
			if (inTitle) title.append(' ');
			text.append(' ');
		}
		return true;
	}

	@Override
	public boolean startElement(final Element element, final Map attrMapUnused) {
		// No element is allowed inside a title.
		inTitle = element == Element.TITLE;
		if (element.breaksFlow) {
			if (inTitle) title.append(' ');
			text.append(' ');
		}
		return true;
	}

}