vendor and env first commit

vendor/league/commonmark/src/Parser/Block/BlockStartParserInterface.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Parser\Block;
+
+use League\CommonMark\Parser\Cursor;
+use League\CommonMark\Parser\MarkdownParserStateInterface;
+
+/**
+ * Interface for a block parser which identifies block starts.
+ */
+interface BlockStartParserInterface
+{
+    /**
+     * Check whether we should handle the block at the current position
+     *
+     * @param Cursor                       $cursor      A cloned copy of the cursor at the current parsing location
+     * @param MarkdownParserStateInterface $parserState Additional information about the state of the Markdown parser
+     *
+     * @return BlockStart|null The BlockStart that has been identified, or null if the block doesn't match here
+     */
+    public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart;
+}