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

@@ -0,0 +1,81 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Block\Parser;
+
+use League\CommonMark\Block\Element\Heading;
+use League\CommonMark\Block\Element\Paragraph;
+use League\CommonMark\ContextInterface;
+use League\CommonMark\Cursor;
+use League\CommonMark\Reference\ReferenceParser;
+use League\CommonMark\Util\RegexHelper;
+
+final class SetExtHeadingParser implements BlockParserInterface
+{
+    public function parse(ContextInterface $context, Cursor $cursor): bool
+    {
+        if ($cursor->isIndented()) {
+            return false;
+        }
+
+        if (!($context->getContainer() instanceof Paragraph)) {
+            return false;
+        }
+
+        $match = RegexHelper::matchAll('/^(?:=+|-+)[ \t]*$/', $cursor->getLine(), $cursor->getNextNonSpacePosition());
+        if ($match === null) {
+            return false;
+        }
+
+        $level = $match[0][0] === '=' ? 1 : 2;
+        $strings = $context->getContainer()->getStrings();
+
+        $strings = $this->resolveReferenceLinkDefinitions($strings, $context->getReferenceParser());
+        if (empty($strings)) {
+            return false;
+        }
+
+        $context->replaceContainerBlock(new Heading($level, $strings));
+
+        return true;
+    }
+
+    /**
+     * Resolve reference link definition
+     *
+     * @see https://github.com/commonmark/commonmark.js/commit/993bbe335931af847460effa99b2411eb643577d
+     *
+     * @param string[]        $strings
+     * @param ReferenceParser $referenceParser
+     *
+     * @return string[]
+     */
+    private function resolveReferenceLinkDefinitions(array $strings, ReferenceParser $referenceParser): array
+    {
+        foreach ($strings as &$string) {
+            $cursor = new Cursor($string);
+            while ($cursor->getCharacter() === '[' && $referenceParser->parse($cursor)) {
+                $string = $cursor->getRemainder();
+            }
+
+            if ($string !== '') {
+                break;
+            }
+        }
+
+        return \array_filter($strings, function ($s) {
+            return $s !== '';
+        });
+    }
+}