1 files changed, 123 insertions, 0 deletions
diff --git a/vendor/league/commonmark/src/Reference/ReferenceParser.php b/vendor/league/commonmark/src/Reference/ReferenceParser.php
new file mode 100644
index 0000000000..c9bea6b571
--- /dev/null
+++ b/vendor/league/commonmark/src/Reference/ReferenceParser.php
@@ -0,0 +1,123 @@
+<?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\Reference;
+
+use League\CommonMark\Cursor;
+use League\CommonMark\Util\LinkParserHelper;
+
+final class ReferenceParser
+{
+    /**
+     * @var ReferenceMapInterface
+     */
+    private $referenceMap;
+
+    public function __construct(ReferenceMapInterface $referenceMap)
+    {
+        $this->referenceMap = $referenceMap;
+    }
+
+    /**
+     * Attempt to parse a link reference, modifying the refmap.
+     *
+     * @param Cursor $cursor
+     *
+     * @return bool
+     */
+    public function parse(Cursor $cursor)
+    {
+        if ($cursor->isAtEnd()) {
+            return false;
+        }
+
+        $initialState = $cursor->saveState();
+
+        $matchChars = LinkParserHelper::parseLinkLabel($cursor);
+        if ($matchChars === 0) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        // We need to trim the opening and closing brackets from the previously-matched text
+        $label = \substr($cursor->getPreviousText(), 1, -1);
+
+        if (\preg_match('/[^\s]/', $label) === 0) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        if ($cursor->getCharacter() !== ':') {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        // Advance past the colon
+        $cursor->advance();
+
+        // Link URL
+        $cursor->advanceToNextNonSpaceOrNewline();
+
+        $destination = LinkParserHelper::parseLinkDestination($cursor);
+        if ($destination === null) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        $previousState = $cursor->saveState();
+
+        if ($cursor->advanceToNextNonSpaceOrNewline() > 0) {
+            $title = LinkParserHelper::parseLinkTitle($cursor);
+        }
+
+        if (!isset($title)) {
+            $title = '';
+            $cursor->restoreState($previousState);
+        }
+
+        // Make sure we're at line end:
+        $atLineEnd = true;
+        if ($cursor->match('/^ *(?:\n|$)/') === null) {
+            if ($title === '') {
+                $atLineEnd = false;
+            } else {
+                // The potential title we found is not at the line end,
+                // but it could still be a legal link reference if we
+                // discard the title
+                $title = '';
+                // rewind before spaces
+                $cursor->restoreState($previousState);
+                // and instead check if the link URL is at the line end
+                $atLineEnd = $cursor->match('/^ *(?:\n|$)/') !== null;
+            }
+        }
+
+        if (!$atLineEnd) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        if (!$this->referenceMap->contains($label)) {
+            $reference = new Reference($label, $destination, $title);
+            $this->referenceMap->addReference($reference);
+        }
+
+        return true;
+    }
+}