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
{
        private $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 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;
        }
}
?>