<?php
/*
 * 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; under version 2
 * of the License (non-upgradable).
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2002-2008 (original work) Public Research Centre Henri Tudor & University of Luxembourg (under the project TAO & TAO2);
 *               2008-2010 (update and modification) Deutsche Institut für Internationale Pädagogische Forschung (under the project TAO-TRANSFER);
 *               2009-2012 (update and modification) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
 *
 */
?>
<?php
/**
 * A simple XML parser that is able to parse SQL files with Simple statements.
 * Please note that complex statements like Procedure or Functions are not
 * supported by this implementation.
 *
 * @author Jerome BOGAERTS <jerome.bogaerts@tudor.lu>
 * @package tao

 */
class tao_install_utils_SimpleSQLParser extends tao_install_utils_SQLParser
{
    
    /**
     * Parses a SQL file containing simple statements.
     * @return void
     * @throws tao_install_utils_SQLParsingException
     */
    public function parse()
    {
        $this->setStatements([]);
        
        //common file checks
        $file = $this->getFile();
        if (!file_exists($file)) {
            throw new tao_install_utils_SQLParsingException("SQL file '${file}' does not exist.");
        } elseif (!is_readable($file)) {
            throw new tao_install_utils_SQLParsingException("SQL file '${file}' is not readable.");
        } elseif (!preg_match("/\.sql$/", basename($file))) {
            throw new tao_install_utils_SQLParsingException("File '${file}' is not a valid SQL file. Extension '.sql' not found.");
        }
        
        if ($handler = fopen($file, "r")) {
            //parse file and get only usefull lines
            $ch = "";
            while (!feof($handler)) {
                $line = utf8_decode(fgets($handler));
        
                if (isset($line[0]) && ($line[0] != '#') && ($line[0] != '-')) {
                    $ch = $ch . $line;
                }
            }
            
            //explode and execute
            $requests = explode(";", $ch);
            
            try {
                foreach ($requests as $index => $request) {
                    $requestTrim = trim($request);
                    if (!empty($requestTrim)) {
                        $this->addStatement($request);
                    }
                }
            } catch (Exception $e) {
                throw new tao_install_utils_SQLParsingException("Error executing query #$index : $request . " . $e->getMessage());
            }
            fclose($handler);
        }
    }
}