smuuf/primi

<?php

declare(strict_types=1);

namespace Smuuf\Primi\Handlers\Kinds;

use \Smuuf\Primi\Context;
use \Smuuf\Primi\Handlers\HandlerFactory;
use \Smuuf\Primi\Ex\BreakException;
use \Smuuf\Primi\Ex\ContinueException;
use \Smuuf\Primi\Handlers\SimpleHandler;

class WhileStatement extends SimpleHandler {

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

        // Execute the left-hand node and get its return value.
        $condHandler = HandlerFactory::getFor($node['left']['name']);
        $blockHandler = HandlerFactory::getFor($node['right']['name']);

        // Counter for determining when to tick the task queue.
        $tickCounter = 0;
        $queue = $context->getTaskQueue();

        while (
            $condHandler::run($node['left'], $context)->isTruthy()
        ) {

            // Tick the task queue every 4 iterations.
            if (++$tickCounter === 4) {
                $queue->tick();
                $tickCounter = 0;
            }

            try {

                $blockHandler::run($node['right'], $context);
                if ($context->hasRetval()) {
                    return;
                }

            } catch (ContinueException $_) {
                continue;
            } catch (BreakException $_) {
                break;
            }

        }

        $queue->tick();

    }

}