<?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);
 *
 */

/**
 * This SQL Parser is able to deal with Functions
 * for PostgresSQL in a compliant SQL file.
 *
 * @author Jerome BOGAERTS <jerome.bogaerts@tudor.lu>
 * @package tao

 */

class tao_install_utils_CustomProceduresParser extends tao_install_utils_SQLParser
{
    
    /**
     * Parse a SQL file containing mySQL compliant Procedures or Functions.
     * @return void
     * @throws tao_install_utils_SQLParsingException
     */
    public function parse()
    {
        $this->setStatements([]);
        $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.");
        }
        
        $content = @file_get_contents($file);
        if ($content !== false) {
            $matches = [];
            $functions = explode(';;', $content);
                        
            
            foreach ($functions as $f) {
                    $this->addStatement($f);
            }
        } else {
            throw new tao_install_utils_SQLParsingException("SQL file '${file}' cannot be read. An unknown error occured while reading it.");
        }
    }
}