1 files changed, 87 insertions, 0 deletions
diff --git a/app/CommonMark/XrefParser.php b/app/CommonMark/XrefParser.php
new file mode 100644
index 0000000000..85f10bfe6e
--- /dev/null
+++ b/app/CommonMark/XrefParser.php
@@ -0,0 +1,87 @@
+<?php
+/**
+ * webtrees: online genealogy
+ * Copyright (C) 2017 webtrees development team
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+namespace Fisharebest\Webtrees\CommonMark;
+
+use Fisharebest\Webtrees\GedcomRecord;
+use Fisharebest\Webtrees\Tree;
+use League\CommonMark\Inline\Element\Link;
+use League\CommonMark\Inline\Parser\AbstractInlineParser;
+use League\CommonMark\InlineParserContext;
+
+/**
+ * Convert XREFs within markdown text to links
+ */
+class XrefParser extends AbstractInlineParser {
+	/** @var Tree - match XREFs in this tree */
+	private $tree;
+
+	/**
+	 * MarkdownXrefParser constructor.
+	 *
+	 * @param Tree $tree
+	 */
+	public function __construct(Tree $tree) {
+		$this->tree = $tree;
+	}
+
+	/**
+	 * We are only interested in text that begins with '@'.
+	 *
+	 * @return array
+	 */
+	public function getCharacters() {
+		return ['@'];
+	}
+
+	/**
+	 * @param InlineParserContext $context
+	 *
+	 * @return bool
+	 */
+	public function parse(InlineParserContext $context) {
+		// The cursor should be positioned on the opening '@'.
+		$cursor = $context->getcursor();
+
+		// If this isn't the start of an XREF, we'll need to rewind.
+		$previous_state = $cursor->saveState();
+
+		$handle = $cursor->match('/@' . WT_REGEX_XREF . '@/');
+		if (empty($handle)) {
+			// Not an XREF?
+			$cursor->restoreState($previous_state);
+
+			return false;
+		}
+
+		$xref = trim($handle, '@');
+
+		$record = GedcomRecord::getInstance($xref, $this->tree);
+
+		if ($record === null) {
+			// Linked record does not exist?
+			$cursor->restoreState($previous_state);
+
+			return false;
+		}
+
+		$url  = $record->getRawUrl();
+		$label = $handle;
+		$title = strip_tags($record->getFullName());
+		$context->getContainer()->appendChild(new Link($url, $label, $title));
+
+		return true;
+	}
+}