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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Joas Schilling <coding@schilljs.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\DB\QueryBuilder;
use OCP\DB\QueryBuilder\ILiteral;
use OCP\DB\QueryBuilder\IParameter;
use OCP\DB\QueryBuilder\IQueryFunction;
class QuoteHelper {
/**
* @param array|string|ILiteral|IParameter|IQueryFunction $strings string, Literal or Parameter
* @return array|string
*/
public function quoteColumnNames($strings) {
if (!is_array($strings)) {
return $this->quoteColumnName($strings);
}
$return = [];
foreach ($strings as $string) {
$return[] = $this->quoteColumnName($string);
}
return $return;
}
/**
* @param string|ILiteral|IParameter|IQueryFunction $string string, Literal or Parameter
* @return string
*/
public function quoteColumnName($string) {
if ($string instanceof IParameter || $string instanceof ILiteral || $string instanceof IQueryFunction) {
return (string) $string;
}
if ($string === null || $string === 'null' || $string === '*') {
return $string;
}
if (!is_string($string)) {
throw new \InvalidArgumentException('Only strings, Literals and Parameters are allowed');
}
$string = str_replace(' AS ', ' as ', $string);
if (substr_count($string, ' as ')) {
return implode(' as ', array_map([$this, 'quoteColumnName'], explode(' as ', $string, 2)));
}
if (substr_count($string, '.')) {
list($alias, $columnName) = explode('.', $string, 2);
if ($columnName === '*') {
return '`' . $alias . '`.*';
}
return '`' . $alias . '`.`' . $columnName . '`';
}
return '`' . $string . '`';
}
}
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