<?php

/***********************************************************************

  Copyright (C) 2002-2005  Rickard Andersson (rickard@punbb.org)

  This file is part of PunBB.

  PunBB is free software; you can redistribute it and/or modify it

  under the terms of the GNU General Public License as published

  by the Free Software Foundation; either version 2 of the License,

  or (at your option) any later version.

  PunBB 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 General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with this program; if not, write to the Free Software

  Foundation, Inc., 59 Temple Place, Suite 330, Boston,

  MA  02111-1307  USA

************************************************************************/

// The contents of this file are very much inspired by the file functions_search.php

// from the phpBB Group forum software phpBB2 (http://www.phpbb.com). 

// Make sure no one attempts to run this script "directly"

if (!defined('PUN'))

	exit;

//

// "Cleans up" a text string and returns an array of unique words

// This function depends on the current locale setting

//

function split_words($text)

{

	global $pun_user;

	static $noise_match, $noise_replace, $stopwords;

	if (empty($noise_match))

	{

		$noise_match = 		array('[quote', '[code', '[url', '[img', '[email', '[color', '[colour', 'quote]', 'code]', 'url]', 'img]', 'email]', 'color]', 'colour]', '^', '$', '&', '(', ')', '<', '>', '`', '\'', '"', '|', ',', '@', '_', '?', '%', '~', '+', '[', ']', '{', '}', ':', '\\', '/', '=', '#', ';', '!', '*');

		$noise_replace =	array('',       '',      '',     '',     '',       '',       '',        '',       '',      '',     '',     '',       '',       '',        ' ', ' ', ' ', ' ', ' ', ' ', ' ', '',  '',   ' ', ' ', ' ', ' ', '',  ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '' ,  ' ', ' ', ' ', ' ', ' ', ' ');

		$stopwords = (array)@file(PUN_ROOT.'lang/'.$pun_user['language'].'/stopwords.txt');

		$stopwords = array_map('trim', $stopwords);

	}

	// Clean up

	$patterns[] = '#&[\#a-z0-9]+?;#i';

	$patterns[] = '#\b[\w]+:\/\/[a-z0-9\.\-]+(\/[a-z0-9\?\.%_\-\+=&\/~]+)?#';

	$patterns[] = '#\[\/?[a-z\*=\+\-]+(\:?[0-9a-z]+)?:[a-z0-9]{10,}(\:[a-z0-9]+)?=?.*?\]#';

	$text = preg_replace($patterns, ' ', ' '.strtolower($text).' ');

	// Filter out junk

	$text = str_replace($noise_match, $noise_replace, $text);

	// Strip out extra whitespace between words

	$text = trim(preg_replace('#\s+#', ' ', $text));

	// Fill an array with all the words

	$words = explode(' ', $text);

	if (!empty($words))

	{

		while (list($i, $word) = @each($words))

		{

			$words[$i] = trim($word, '.');

			$num_chars = pun_strlen($word);

			if ($num_chars < 3 || $num_chars > 20 || in_array($word, $stopwords))

				unset($words[$i]);

		}

	}

	return array_unique($words);

}

//

// Updates the search index with the contents of $post_id (and $subject)

//

function update_search_index($mode, $post_id, $message, $subject = null)

{

	// Split old and new post/subject to obtain array of 'words'

	$words_message = split_words($message);

	$words_subject = ($subject) ? split_words($subject) : array();

	if ($mode == 'edit')

	{

		// Declare here to stop array_keys() and array_diff() from complaining if not set

		$cur_words['post'] = array();

		$cur_words['subject'] = array();

		{

			$match_in = ($row[2]) ? 'subject' : 'post';

			$cur_words[$match_in][$row[1]] = $row[0];

		}

		$words['add']['post'] = array_diff($words_message, array_keys($cur_words['post']));

		$words['add']['subject'] = array_diff($words_subject, array_keys($cur_words['subject']));

		$words['del']['post'] = array_diff(array_keys($cur_words['post']), $words_message);

		$words['del']['subject'] = array_diff(array_keys($cur_words['subject']), $words_subject);

	}

	else

	{

		$words['add']['post'] = $words_message;

		$words['add']['subject'] = $words_subject;

		$words['del']['post'] = array();

		$words['del']['subject'] = array();

	}

	unset($words_message);

	unset($words_subject);

	// Get unique words from the above arrays

	$unique_words = array_unique(array_merge($words['add']['post'], $words['add']['subject']));

	if (!empty($unique_words))

	{

		$word_ids = array();

			$word_ids[$row[1]] = $row[0];

		$new_words = array_diff($unique_words, array_keys($word_ids));

		unset($unique_words);

		if (!empty($new_words))

		{

			switch ($db_type)

			{

				case 'mysql':

				case 'mysqli':

					break;

				default:

					while (list(, $word) = @each($new_words))

					break;

			}

		}

		unset($new_words);

	}

	// Delete matches (only if editing a post)

	while (list($match_in, $wordlist) = @each($words['del']))

	{

		$subject_match = ($match_in == 'subject') ? 1 : 0;

		if (!empty($wordlist))

		{

			$sql = '';

			while (list(, $word) = @each($wordlist))

				$sql .= (($sql != '') ? ',' : '').$cur_words[$match_in][$word];

		}

	}

	// Add new matches

	while (list($match_in, $wordlist) = @each($words['add']))

	{

		$subject_match = ($match_in == 'subject') ? 1 : 0;

		if (!empty($wordlist))

	}

	unset($words);

}

//

// Strip search index of indexed words in $post_ids

//

function strip_search_index($post_ids)

{

	switch ($db_type)

	{

		case 'mysql':

		case 'mysqli':

		{

			{

				$word_ids = '';

					$word_ids .= ($word_ids != '') ? ','.$row[0] : $row[0];

				{

					$word_ids = '';

						$word_ids .= ($word_ids != '') ? ','.$row[0] : $row[0];

				}

			}

			break;

		}

		default:

			break;

	}

}