smuuf/primi

<?php

declare(strict_types=1);

namespace Smuuf\Primi\Handlers\Kinds;

use \Smuuf\Primi\Context;
use \Smuuf\Primi\Ex\RuntimeError;
use \Smuuf\Primi\Values\AbstractValue;
use \Smuuf\Primi\Handlers\HandlerFactory;
use \Smuuf\Primi\Handlers\ChainedHandler;
use \Smuuf\Primi\Structures\ItemInsertionProxy;

class VectorItem extends ChainedHandler {

    public static function chain(
        array $node,
        Context $context,
        AbstractValue $subject
    ) {

        $key = HandlerFactory::runNode($node['index'], $context);

        // If this is a leaf node, return an insertion proxy.
        if ($node['leaf']) {
            return new ItemInsertionProxy($key, $subject);
        }

        // This is not a leaf node, so just return the value this non-leaf node
        // points to.
        $value = $subject->itemGet($key);
        if ($value === \null) {
            throw new RuntimeError(\sprintf(
                "Type '%s' does not support item access",
                $subject->getTypeName()
            ));
        }

        return $value;

    }

}