errant/tacit

<?php 
namespace Tacit\Instruction\Branch;
/**
 * Jump if Less Than
 *
 * @author Tom Morton
 */
class Jmp extends \Tacit\Instruction {

    public $command = 'JMP';

    public function execute($vm)
    {
        $vm->pointer++;
        $vm->pointer = $vm->getByte();
    }

    public function compile(&$bytestream, $byte, $command)
    {
        if(!isset($command['T_OPERAND'])) {
            throw new \Exception('Type ' . $this->command . ' expects an operand');
        }

        if($command['T_OPERAND'] > 255) {
            throw new \Exception('Type ' . $this->command . ' overflow (0-255)');
        }

        $bytestream[] = $byte;

        $uuid = uniqid();
        $bytestream[] = $uuid;

        return array((int) $command['T_OPERAND'], $uuid);

    }
}