/*
Jazzy - a Java library for Spell Checking
Copyright (C) 2001 Mindaugas Idzelis
Full text of license can be found in LICENSE.txt

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 2.1 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
package com.swabunga.spell.event;

/**
 * A basic word finder, which searches text for sequences of letters.
 * 
 * @author Anthony Roy (ajr@antroy.co.uk)
 */
public class DefaultWordFinder extends AbstractWordFinder {

	// ~ Instance/static variables ...............................................

	// ~ Constructors ............................................................

	/**
	 * Creates a new DefaultWordFinder object.
	 * 
	 * @param inText
	 *            the String to search
	 */
	public DefaultWordFinder(String inText) {
		super(inText);
	}

	public DefaultWordFinder() {
		super();
	}

	// ~ Methods .................................................................

	/**
	 * This method scans the text from the end of the last word, and returns a new Word object corresponding to the next word.
	 * 
	 * @return the next word.
	 * @throws WordNotFoundException
	 *             search string contains no more words.
	 */
	@Override
	public Word next() {
		if (nextWord == null) {
			throw new WordNotFoundException("No more words found.");
		}
		currentWord.copy(nextWord);
		setSentenceIterator(currentWord);

		int i = currentWord.getEnd();
		boolean finished = false;

		while (i < text.length() && !finished) {
			if (isWordChar(i)) {
				nextWord.setStart(i);
				int end = getNextWordEnd(text, i);
				nextWord.setText(text.substring(i, end));
				finished = true;
			}
			i++;
		}
		if (!finished) {
			nextWord = null;
		}

		return currentWord;
	}

	/**
	 * Returns the position in the string <em>after</em> the end of the next word. Note that this return value should not be used as an
	 * index into the string without checking first that it is in range, since it is possible for the value <code>text.length()</code> to be
	 * returned by this method.
	 */
	private int getNextWordEnd(String text, int startPos) {
		// If we're dealing with a possible 'internet word' we need to provide
		// some special handling
		if (SpellChecker.isINETWord(text.substring(startPos))) {
			for (int i = startPos; i < text.length(); i++) {
				char ch = text.charAt(i);
				if (Character.isLetterOrDigit(ch)) {
					continue;
				}

				if (ch == '\r' || ch == '\n') {
					return i;
				}
				// Chop off any characters that might be enclosing the 'internet word'. eg ',",),]
				if (Character.isSpaceChar(ch)) {
					if (i > 0 && Character.isLetterOrDigit(text.charAt(i - 1))) {
						return i;
					} else {
						return i - 1;
					}
				}
			}
			return text.length();
		} else {
			for (int i = startPos; i < text.length(); i++) {
				if (!isWordChar(i)) {
					return i;
				}
			}
			return text.length();
		}
	}
}