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<?php declare(strict_types=1);

namespace PhpParser\Node\Expr;

use PhpParser\Node\Expr;

abstract class BinaryOp extends Expr
{
    /** @var Expr The left hand side expression */
    public $left;
    /** @var Expr The right hand side expression */
    public $right;

    /**
     * Constructs a binary operator node.
     *
     * @param Expr  $left       The left hand side expression
     * @param Expr  $right      The right hand side expression
     * @param array $attributes Additional attributes
     */
    public function __construct(Expr $left, Expr $right, array $attributes = []) {
        $this->attributes = $attributes;
        $this->left = $left;
        $this->right = $right;
    }

    public function getSubNodeNames() : array {
        return ['left', 'right'];
    }

    /**
     * Get the operator sigil for this binary operation.
     *
     * In the case there are multiple possible sigils for an operator, this method does not
     * necessarily return the one used in the parsed code.
     *
     * @return string
     */
    abstract public function getOperatorSigil() : string;
}