/**
* Constructs a comparison expression with the comparison
* operator $op and two operands, $left and $right,
* which are FQLExpressions themselves.
*
* @param $op comparison operator (<, >, =, ==, <=,
* >=, !=, <>, ^=, !^)
* @param $left FQLExpression representing left operand
* @param $right FQLExpression representing right operand
*/
public function __construct($op, $left, $right)
{
$this->op = $op;
// canonicalize operators
switch ($this->op) {
case '=':
$this->op = '==';
break;
case '<>':
$this->op = '!=';
break;
}
parent::__construct($left, $right);
}
/**
* Constructs the arithmetic expression with the arithmetic
* operator $op and two operands, $left and $right, which
* are FQLExpressions themselves.
*
* @param $op arithmetic op (+, -, *, /)
* @param $left FQLExpression representing left operand
* @param $right FQLExpression representing right operand
*/
public function __construct($op, $left, $right)
{
$this->op = $op;
parent::__construct($left, $right);
}
