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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2016 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Db\Sql;
abstract class AbstractExpression implements ExpressionInterface
{
/**
* @var string[]
*/
protected $allowedTypes = [
self::TYPE_IDENTIFIER,
self::TYPE_LITERAL,
self::TYPE_SELECT,
self::TYPE_VALUE,
];
/**
* Normalize Argument
*
* @param mixed $argument
* @param string $defaultType
*
* @return array
*
* @throws Exception\InvalidArgumentException
*/
protected function normalizeArgument($argument, $defaultType = self::TYPE_VALUE)
{
if ($argument instanceof ExpressionInterface || $argument instanceof SqlInterface) {
return $this->buildNormalizedArgument($argument, self::TYPE_VALUE);
}
if (is_scalar($argument) || $argument === null) {
return $this->buildNormalizedArgument($argument, $defaultType);
}
if (is_array($argument)) {
$value = current($argument);
if ($value instanceof ExpressionInterface || $value instanceof SqlInterface) {
return $this->buildNormalizedArgument($value, self::TYPE_VALUE);
}
$key = key($argument);
if (is_integer($key) && ! in_array($value, $this->allowedTypes)) {
return $this->buildNormalizedArgument($value, $defaultType);
}
return $this->buildNormalizedArgument($key, $value);
}
throw new Exception\InvalidArgumentException(sprintf(
'$argument should be %s or %s or %s or %s or %s, "%s" given',
'null',
'scalar',
'array',
'Zend\Db\Sql\ExpressionInterface',
'Zend\Db\Sql\SqlInterface',
is_object($argument) ? get_class($argument) : gettype($argument)
));
}
/**
* @param mixed $argument
* @param string $argumentType
*
* @return array
*
* @throws Exception\InvalidArgumentException
*/
private function buildNormalizedArgument($argument, $argumentType)
{
if (! in_array($argumentType, $this->allowedTypes)) {
throw new Exception\InvalidArgumentException(sprintf(
'Argument type should be in array(%s)',
implode(',', $this->allowedTypes)
));
}
return [
$argument,
$argumentType,
];
}
}