123 lines
5.2 KiB
PHP
123 lines
5.2 KiB
PHP
<?php defined("SYSPATH") or die("No direct script access.");
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/**
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* Gallery - a web based photo album viewer and editor
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* Copyright (C) 2000-2013 Bharat Mediratta
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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class search extends search_Core {
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/**
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* Add more terms to the query by wildcarding the stem value of the first
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* few terms in the query.
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*/
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static function add_query_terms($q) {
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$MAX_TERMS = 5; // used to limit the max number of extra terms
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$prefix = module::get_var("short_search_fix","search_prefix"); // short search fix prefix
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// strip leading, trailing, and extra whitespaces
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$terms = preg_replace('/^\s+/', '', $q);
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$terms = preg_replace('/\s+$/', '', $terms);
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$terms = preg_replace('/\s\s+/', ' ', $terms);
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// explode terms, initialize the loop
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$terms = explode(" ", $terms); // array
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$termsextra = ""; // string, not array
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$numtermsextra = 0;
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$flagwild = 1;
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$countquote = 0;
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$countparen = 0;
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// run the loop for each term
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foreach ($terms as &$term) {
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$countprefix = 0;
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$countsuffix = 0;
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$flagopenparen = 0;
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$flagcloseparen = 0;
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// set flagwild to 0 if we're over MAX_TERMS (only runs if we're not in the middle of parens/quotes)
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if ($countparen == 0 && $countquote == 0 && ($numtermsextra >= ($MAX_TERMS - 1))) {
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$flagwild = 0;
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}
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// find opening special characters
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while ((substr($term, $countprefix, 1) == "(" ||
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substr($term, $countprefix, 1) == '"' ||
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substr($term, $countprefix, 1) == "+" ||
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substr($term, $countprefix, 1) == "-" ||
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substr($term, $countprefix, 1) == "~" ||
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substr($term, $countprefix, 1) == "<" ||
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substr($term, $countprefix, 1) == ">") &&
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($countprefix+$countsuffix) < strlen($term)) {
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if (substr($term, $countprefix, 1) == '"') {
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$countquote++;
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$flagwild = 0;
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}
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if (substr($term, $countprefix, 1) == "(") {
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$countparen++;
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$flagopenparen = 1;
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}
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$countprefix++;
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}
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// reset flagwild to 1 if we're under MAX_TERMS (only runs if we're not in the middle of quotes, and forced to run if we're still in paren)
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if ($countquote == 0 && ($countparen > 0 || $numtermsextra < ($MAX_TERMS - 1))) {
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$flagwild = 1;
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}
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// find closing special characters
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while ((substr($term, -$countsuffix-1, 1) == ")" ||
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substr($term, -$countsuffix-1, 1) == '"') &&
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($countprefix+$countsuffix) < strlen($term)) {
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if (substr($term, -$countsuffix-1, 1) == '"') {
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$countquote = max(0, $countquote-1);
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}
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if (substr($term, -$countsuffix-1, 1) == ")") {
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$countparen = max(0, $countparen-1);
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$flagcloseparen = 1;
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}
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$countsuffix++;
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}
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// split term
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$termprefix = substr($term, 0, $countprefix);
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$termterm = substr($term."A", $countprefix, -$countsuffix-1); // artificial padded A assures that the third argument is always negative
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$termsuffix = substr($term, -$countsuffix, $countsuffix);
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// add extra terms with wildcards
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if ($flagwild == 1 &&
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substr($termterm, -1, 1) != "*" &&
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strlen($termterm) > 0) {
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// @todo: make this i18n friendly with the plural character (only works here with s)
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$termsextra = $termsextra . $termprefix . $prefix . rtrim($termterm, "s") . "*" . $termsuffix . " ";
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$numtermsextra++;
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} elseif ($flagopenparen == 1 && $flagcloseparen == 0) {
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$termsextra = $termsextra . str_replace('"', '', $termprefix);
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} elseif ($flagopenparen == 0 && $flagcloseparen == 1) {
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$termsextra = preg_replace('/\s+$/', '', $termsextra) . ") ";
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}
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// add short search prefixes
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if (strlen($termterm) > 0) {
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$term = $termprefix . $prefix . $termterm . $termsuffix;
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}
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}
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// implode terms, trim termsextra trailing space (if it exists)
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$terms = implode(" ", $terms);
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$termsextra = preg_replace('/\s+$/', '', $termsextra);
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// add extra closing quotes and parentheses
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while ($countquote > 0) {
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$terms = $terms.'"';
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$termsextra = $termsextra.'"';
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$countquote--;
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}
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while ($countparen > 0) {
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$terms = $terms.")";
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$termsextra = $termsextra.")";
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$countparen--;
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}
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// all done!
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return ($terms." ".$termsextra);
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}
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} |