From 1d1024c57a2067d7fe0f6e1e97cd8df584481892 Mon Sep 17 00:00:00 2001
From: syuilo <syuilotan@yahoo.co.jp>
Date: Fri, 23 Nov 2018 16:02:17 +0900
Subject: [PATCH] [MFM] Improve hashtag detection

Resolve #3387
---
 src/mfm/parser.ts | 1 +
 test/mfm.ts       | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/src/mfm/parser.ts b/src/mfm/parser.ts
index 047124e58..5a20c7ef2 100644
--- a/src/mfm/parser.ts
+++ b/src/mfm/parser.ts
@@ -112,6 +112,7 @@ const mfm = P.createLanguage({
 			const text = input.substr(i);
 			const match = text.match(/^#([^\s\.,!\?#]+)/i);
 			if (!match) return P.makeFailure(i, 'not a hashtag');
+			if (match[1].match(/[0-9]+/)) return P.makeFailure(i, 'not a hashtag');
 			if (input[i - 1] != '\n' && input[i - 1] != ' ' && input[i - 1] != null) return P.makeFailure(i, 'require space before "#"');
 			return P.makeSuccess(i + match[0].length, makeNode('hashtag', { hashtag: match[1] }));
 		}),
diff --git a/test/mfm.ts b/test/mfm.ts
index a40f769f8..8ca09c741 100644
--- a/test/mfm.ts
+++ b/test/mfm.ts
@@ -204,6 +204,13 @@ describe('Text', () => {
 					text('!'),
 				], tokens);
 			});
+
+			it('disallow number only', () => {
+				const tokens = analyze('#123');
+				assert.deepEqual([
+					text('#123'),
+				], tokens);
+			});
 		});
 
 		describe('quote', () => {