smuuf/primi

<?php

declare(strict_types=1);

namespace Smuuf\Primi\Handlers\Kinds;

use \Smuuf\Primi\Context;
use \Smuuf\Primi\Ex\EngineInternalError;
use \Smuuf\Primi\Handlers\SimpleHandler;
use \Smuuf\Primi\Handlers\HandlerFactory;
use \Smuuf\Primi\Structures\AssignmentTargets;
use \Smuuf\Primi\Structures\InsertionProxyInterface;

class Assignment extends SimpleHandler {

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

        // Execute the right-hand node first.
        $return = HandlerFactory::runNode($node['right'], $context);
        $target = HandlerFactory::runNode($node['left'], $context);

        if (\is_string($target)) {
            // Store the return value into variable in current scope.
            $context->setVariable($target, $return);
            return $return;
        }

        if ($target instanceof InsertionProxyInterface) {
            // Vector handler returns a proxy with the key being
            // pre-configured. Commit the value to that key into the correct
            // value object.
            $target->commit($return);
            return $return;
        }

        if ($target instanceof AssignmentTargets) {
            $target->assign($return, $context);
            return $return;
        }

        throw new EngineInternalError("Invalid assignment target");

    }

}