finished default parser

src/Domain/Modules/Interpreter/Lexicon/MusicLine.php

@@ -0,0 +1,43 @@
+<?php
+namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
+
+use Enzyme\Axiom\Atoms\StringAtom;
+use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
+use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
+
+class MusicLine implements Lex
+{
+    use LineKeyDataTrait;
+
+    /**
+     * @var Builder
+     */
+    protected $builder;
+
+    public function __construct(Builder $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 ($context->getState() === $context::MODE_TUNE_BODY
+            && $key !== 'K'
+            && $line !== ''
+        ) {
+            $this->builder->appendMusic(new StringAtom($line));
+        }
+
+        return $next($context);
+    }
+}