class.ilLuceneQueryParser.php

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<?php
/*
    +-----------------------------------------------------------------------------+
    | ILIAS open source                                                           |
    +-----------------------------------------------------------------------------+
    | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
    |                                                                             |
    | This program 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.                      |
    |                                                                             |
    | This program 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. |
    +-----------------------------------------------------------------------------+
*/

include_once './Services/Search/classes/Lucene/class.ilLuceneQueryParserException.php';

class ilLuceneQueryParser
{
    protected $query_string;
    protected $parsed_query;
    

    public function __construct($a_query_string)
    {
        $this->query_string = $a_query_string;
    }
    
    public function parse()
    {
        $this->parsed_query = preg_replace_callback('/(owner:)\s?([A-Za-z0-9_\.\+\*\@!\$\%\~\-]+)/', array($this,'replaceOwnerCallback'), $this->query_string);
    }
    
    public function parseAutoWildcard()
    {
        $this->parsed_query = trim($this->query_string);
        if (stristr($this->parsed_query, '*')) {
            return true;
        }
        if (substr($this->parsed_query, -1) !== '"') {
            $this->parsed_query .= '*';
        }
        return true;
    }
    
    public function getQuery()
    {
        return $this->parsed_query;
    }
    
    protected function replaceOwnerCallback($matches)
    {
        if (isset($matches[2])) {
            if ($usr_id = ilObjUser::_loginExists($matches[2])) {
                return $matches[1] . $usr_id;
            }
        }
        return $matches[0];
    }
    
    
    public static function validateQuery($a_query)
    {
        // TODO
        // First replace all quote characters

        
        #ilLuceneQueryParser::checkAllowedCharacters($a_query);
        #ilLuceneQueryParser::checkAsterisk($a_query);
        #ilLuceneQueryParser::checkAmpersands($a_query);
        ilLuceneQueryParser::checkCaret($a_query);
        ilLuceneQueryParser::checkSquiggle($a_query);
        #ilLuceneQueryParser::checkExclamationMark($a_query);
        #ilLuceneQueryParser::checkQuestionMark($a_query);
        ilLuceneQueryParser::checkParenthesis($a_query);
        #ilLuceneQueryParser::checkPlusMinus($a_query);
        #ilLuceneQueryParser::checkANDORNOT($a_query);
        ilLuceneQueryParser::checkQuotes($a_query);
        #ilLuceneQueryParser::checkColon($a_query);
        return true;
    }
    
    protected static function checkAllowedCharacters($query)
    {
        if (preg_match('/[^\pL0-9_+\-:.()\"*?&§€|!{}\[\]\^~\\@#\/$%\'= ]/u', $query) != 0) {
            throw new ilLuceneQueryParserException('lucene_err_allowed_characters');
        }
        return true;
    }
    
    protected static function checkAsterisk($query)
    {
        if (preg_match('/^[\*]*$|[\s]\*|^\*[^\s]/', $query) != 0) {
            throw new ilLuceneQueryParserException('lucene_err_asterisk');
        }
        return true;
    }
    
    protected static function checkAmpersands($query)
    {
        if (preg_match('/[&]{2}/', $query) > 0) {
            if (preg_match('/^([\pL0-9_+\-:.()\"*?&|!{}\[\]\^~\\@#\/$%\'=]+( && )?[\pL0-9_+\-:.()\"*?|!{}\[\]\^~\\@#\/$%\'=]+[ ]*)+$/u', $query) == 0) {
                throw new ilLuceneQueryParserException('lucene_err_ampersand');
            }
        }
        return true;
    }

    protected static function checkCaret($query)
    {
        if (preg_match('/[^\\\]\^([^\s]*[^0-9.]+)|[^\\\]\^$/', $query) != 0) {
            throw new ilLuceneQueryParserException('lucene_err_caret');
        }
        return true;
    }

    protected static function checkSquiggle($query)
    {
        if (preg_match('/[^\\\]*~[^\s]*[^0-9\s]+/', $query, $matches) != 0) {
            throw new ilLuceneQueryParserException('lucene_err_squiggle');
        }
        return true;
    }

    protected static function checkExclamationMark($query)
    {
        if (preg_match('/^[^!]*$|^([\pL0-9_+\-:.()\"*?&|!{}\[\]\^~\\@#\/$%\'=]+( ! )?[\pL0-9_+\-:.()\"*?&|!{}\[\]\^~\\@#\/$%\'=]+[ ]*)+$/u', $query, $matches) == 0) {
            throw new ilLuceneQueryParserException('lucene_err_exclamation_mark');
        }
        return true;
    }

    protected static function checkQuestionMark($query)
    {
        if (preg_match('/^(\?)|([^\pL0-9_+\-:.()\"*?&|!{}\[\]\^~\\@#\/$%\'=]\?+)/u', $query, $matches) != 0) {
            throw new ilLuceneQueryParserException('lucene_err_question_mark');
        }
        return true;
    }
    
    protected static function checkParenthesis($a_query)
    {
        $hasLft = false;
        $hasRgt = false;
        
        $matchLft = 0;
        $matchRgt = 0;
        
        $tmp = array();
        
        if (($matchLft = preg_match_all('/[(]/', $a_query, $tmp)) > 0) {
            $hasLft = true;
        }
        if (($matchRgt = preg_match_all('/[)]/', $a_query, $tmp)) > 0) {
            $hasRgt = true;
        }
        
        if (!$hasLft || !$hasRgt) {
            return true;
        }
        
        
        if (($hasLft && !$hasRgt) || ($hasRgt && !$hasLft)) {
            throw new ilLuceneQueryParserException('lucene_err_parenthesis_not_closed');
        }
        
        if ($matchLft !== $matchRgt) {
            throw new ilLuceneQueryParserException('lucene_err_parenthesis_not_closed');
        }
        
        if (preg_match('/\(\s*\)/', $a_query) > 0) {
            throw new ilLuceneQueryParserException('lucene_err_parenthesis_empty');
        }
        return true;
    }

    protected static function checkPlusMinus($a_query)
    {
        if (preg_match('/^[^\n+\-]*$|^([+-]?\s*[\pL0-9_:.()\"*?&|!{}\[\]\^~\\@#\/$%\'=]+[ ]?)+$/u', $a_query) == 0) {
            throw new ilLuceneQueryParserException('lucene_err_plus_minus');
        }
        return true;
    }

    protected static function checkANDORNOT($a_query)
    {
        return true;
        
        if (preg_match('/^([\pL0-9_+\-:.()\"*?&|!{}\[\]\^~\\@\/#$%\'=]+\s*((AND )|(OR )|(AND NOT )|(NOT ))?[\pL0-9_+\-:.()\"*?&|!{}\[\]\^~\\@\/#$%\'=]+[ ]*)+$/u', $a_query) == 0) {
            throw new ilLuceneQueryParserException('lucene_err_and_or_not');
        }
        return true;
    }

    protected static function checkQuotes($a_query)
    {
        $matches = preg_match_all('/"/', $a_query, $tmp);
        
        if ($matches == 0) {
            return true;
        }
        
        if (($matches % 2) > 0) {
            throw new ilLuceneQueryParserException('lucene_err_quotes');
        }

        if (preg_match('/"\s*"/', $a_query) > 0) {
            throw new ilLuceneQueryParserException('lucene_err_quotes_not_empty');
        }
        return true;
    }


    protected static function checkColon($a_query)
    {
        if (preg_match('/[^\\\\s]:[\s]|[^\\\\s]:$|[\s][^\\]?:|^[^\\\\s]?:/', $a_query) != 0) {
            throw new ilLuceneQueryParserException('lucene_err_colon');
        }
        return true;
    }
}