smuuf/primi

<?php

declare(strict_types=1);

namespace Smuuf\Primi\Handlers\Kinds;

use \Smuuf\Primi\Context;
use \Smuuf\Primi\Ex\BinaryOperationError;
use \Smuuf\Primi\Handlers\SimpleHandler;
use \Smuuf\Primi\Handlers\HandlerFactory;

class Exponentiation extends SimpleHandler {

    protected static function handle(array $node, Context $context) {

        $operand = HandlerFactory::runNode($node['operand'], $context);
        $factor = HandlerFactory::runNode($node['factor'], $context);

        $result = $operand->doPower($factor);
        if ($result === \null) {
            throw new BinaryOperationError('**', $operand, $factor);
        }

        return $result;

    }

    public static function reduce(array &$node): void {

        // If there is no factor, then there's no need to keep this as
        // a complex node of this type. Reduce this node to its only operand.
        if (!isset($node['factor'])) {
            $node = $node['operand'];
        }

    }

}