src/Doctrine/Functions/Sqlite/Distance.php
<?php
namespace inklabs\kommerce\Doctrine\Functions\Sqlite;
use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\Lexer;
use Doctrine;
/**
* "DISTANCE" "(" fromLatitude, fromLongitude, toLatitude, toLongitude ")"
*/
class Distance extends FunctionNode
{
/** @var Doctrine\ORM\Query\AST\Literal */
protected $fromLatitude;
/** @var Doctrine\ORM\Query\AST\Literal */
protected $fromLongitude;
/** @var Doctrine\ORM\Query\AST\Literal */
protected $toLatitude;
/** @var Doctrine\ORM\Query\AST\Literal */
protected $toLongitude;
public function parse(Doctrine\ORM\Query\Parser $parser)
{
$parser->match(Lexer::T_IDENTIFIER);
$parser->match(Lexer::T_OPEN_PARENTHESIS);
$this->fromLatitude = $parser->ArithmeticExpression();
$parser->match(Lexer::T_COMMA);
$this->fromLongitude = $parser->ArithmeticExpression();
$parser->match(Lexer::T_COMMA);
$this->toLatitude = $parser->ArithmeticExpression();
$parser->match(Lexer::T_COMMA);
$this->toLongitude = $parser->ArithmeticExpression();
$parser->match(Lexer::T_CLOSE_PARENTHESIS);
}
/**
* Simple Manhattan Distance
* 69.09 = approximate number of miles per degree of latitude.
*
* @param Doctrine\ORM\Query\SqlWalker $sqlWalker
* @return string
*/
public function getSql(Doctrine\ORM\Query\SqlWalker $sqlWalker)
{
$sql = 'ROUND(ABS(' . $this->fromLatitude->dispatch($sqlWalker) .
' - ' . $this->toLatitude->dispatch($sqlWalker) .
') + ABS(' . $this->fromLongitude->dispatch($sqlWalker) .
' - ' . $this->toLongitude->dispatch($sqlWalker) .
') * 69.09, 3)';
return $sql;
}
}