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<?php
namespace App\Node;
use App\Exception\DivisionByZeroException;
use App\Exception\VisitorException;
use App\Token;
use App\Visitor;
class BinaryOperator implements Visitable
{
/**
* @var Visitable
*/
public $left;
* @var Token
public $operator;
public $right;
* BinaryOperator constructor.
* @param Visitable $left
* @param Token $operator
* @param Visitable $right
public function __construct(Visitable $left, Token $operator, Visitable $right)
$this->left = $left;
$this->operator = $operator;
$this->right = $right;
}
* @inheritDoc
public function accept(Visitor $visitor)
/** @var int|float $leftValue */
$leftValue = $visitor->visit($this->left);
/** @var int|float $rightValue */
$rightValue = $visitor->visit($this->right);
switch ($this->operator->type) {
case Token::PLUS:
return $leftValue + $rightValue;
case Token::MINUS;
return $leftValue - $rightValue;
case Token::MUL;
return $leftValue * $rightValue;
case Token::POWER:
return $leftValue ** $rightValue;
case Token::REALDIV;
//not strict for int/float
/** @noinspection TypeUnsafeComparisonInspection */
if ($rightValue == 0) {
throw new DivisionByZeroException('Division be zero not allowed');
return $leftValue / $rightValue;
throw new VisitorException('Unknown operator for BinaryOperator');
drumser /
arithmetic-parser
