abcParser/src/Domain/Modules/Interpreter/Lexicon/Book.php

<?php
namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;

use Enzyme\Axiom\Atoms\StringAtom;
use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;

class Book implements Lex
{
    use LineKeyDataTrait;

    /**
     * @var TuneBuilder
     */
    protected $builder;

    public function __construct(TuneBuilder $builder)
    {
        $this->builder = $builder;
    }

    /**
     * @param Context $context
     * @param \Closure $next
     * @return mixed
     * @throws \Enzyme\Axiom\Exceptions\AtomException
     */
    public function handle(Context $context, \Closure $next)
    {
        $line = $context->current();
        list($key, $data) = $this->getKeyDataFromLine($line);

        if ($key === 'B') {
            $this->builder->addBook(new StringAtom($data));
        }

        return $next($context);
    }
}