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<?php
/**
* Bitrix Framework
* @package bitrix
* @subpackage main
* @copyright 2001-2013 Bitrix
*/
namespace Bitrix\Main\DB;
use Bitrix\Main\Application;
/**
* Class SqlExpression
*
* @package Bitrix\Main\DB
*/
class SqlExpression
{
/** @var string */
protected $expression;
/** @var array */
protected $args = array();
protected $pattern = '/([^\\\\]|^)(\?[#sifv]?)/';
protected $i;
/** @var Connection */
protected $connection;
/**
* @param string $expression Sql expression.
* @param string,... $args Substitutes.
*
* @throws \Bitrix\Main\ArgumentException
*/
public function __construct()
{
$args = func_get_args();
if (!isset($args[0]))
{
throw new \Bitrix\Main\ArgumentException('No pattern has been found for SqlExpression');
}
$this->expression = $args[0];
for ($i = 1, $n = count($args); $i < $n; $i++)
{
$this->args[] = $args[$i];
}
}
/**
* Returns $expression with replaced placeholders.
*
* @return string
*/
public function compile()
{
$this->i = -1;
if (strpos($this->expression, '\\') === false)
{
// regular case
return preg_replace_callback($this->pattern, array($this, 'execPlaceholders'), $this->expression);
}
else
{
// handle escaping \ and \\
$parts = explode('\\\\', $this->expression);
foreach ($parts as &$part)
{
if (!empty($part))
{
$part = preg_replace_callback($this->pattern, array($this, 'execPlaceholders'), $part);
}
}
$parts = str_replace('\\?', '?', $parts);
return implode('\\\\', $parts);
}
}
/**
* Used by compile method to replace placeholders with values.
*
* @param array $matches Matches found by preg_replace.
*
* @return string
*/
protected function execPlaceholders($matches)
{
$sqlHelper = $this->getConnection()->getSqlHelper();
$this->i++;
$pre = $matches[1];
$ph = $matches[2];
if (array_key_exists($this->i, $this->args))
{
$value = $this->args[$this->i];
if ($value === null && $ph !== '?#')
{
$value = 'NULL';
}
elseif ($ph == '?' || $ph == '?s')
{
$value = "'" . $sqlHelper->forSql($value) . "'";
}
elseif ($ph == '?#')
{
$value = $sqlHelper->quote($value);
}
elseif ($ph == '?v')
{
$value = $sqlHelper->values($value);
}
elseif ($ph == '?i')
{
$value = (int) $value;
}
elseif ($ph == '?f')
{
$value = (float) $value;
}
return $pre . $value;
}
return $matches[0];
}
public function __toString()
{
return $this->compile();
}
/**
* @return Connection
*/
public function getConnection()
{
if ($this->connection === null)
{
$this->connection = Application::getConnection();
}
return $this->connection;
}
/**
* @param Connection $connection
*/
public function setConnection($connection)
{
$this->connection = $connection;
}
}