From 8f5f3985f4609776eb21ca8d89a67ef10886df52 Mon Sep 17 00:00:00 2001
From: syuilo <syuilotan@yahoo.co.jp>
Date: Wed, 21 Nov 2018 08:30:29 +0900
Subject: [PATCH] [MFM] Fix hashtag parsing

---
 src/mfm/parser.ts |  2 +-
 test/mfm.ts       | 59 ++++++++++++++++++++++++++++++++---------------
 2 files changed, 41 insertions(+), 20 deletions(-)

diff --git a/src/mfm/parser.ts b/src/mfm/parser.ts
index 5f89696c20..4ad38d7a24 100644
--- a/src/mfm/parser.ts
+++ b/src/mfm/parser.ts
@@ -110,7 +110,7 @@ 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 (input[i - 1] != ' ' && input[i - 1] != null) return P.makeFailure(i, 'require space before "#"');
+			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] }));
 		}),
 	//#endregion
diff --git a/test/mfm.ts b/test/mfm.ts
index f020ffd5a5..0f878ea9b1 100644
--- a/test/mfm.ts
+++ b/test/mfm.ts
@@ -162,27 +162,48 @@ describe('Text', () => {
 			});
 		});
 
-		it('hashtag', () => {
-			const tokens1 = analyze('Strawberry Pasta #alice');
-			assert.deepEqual([
-				text('Strawberry Pasta '),
-				node('hashtag', { hashtag: 'alice' })
-			], tokens1);
+		describe('hashtag', () => {
+			it('simple', () => {
+				const tokens = analyze('#alice');
+				assert.deepEqual([
+					node('hashtag', { hashtag: 'alice' })
+				], tokens);
+			});
 
-			const tokens2 = analyze('Foo #bar, baz #piyo.');
-			assert.deepEqual([
-				text('Foo '),
-				node('hashtag', { hashtag: 'bar' }),
-				text(', baz '),
-				node('hashtag', { hashtag: 'piyo' }),
-				text('.'),
-			], tokens2);
+			it('after line break', () => {
+				const tokens = analyze('foo\n#alice');
+				assert.deepEqual([
+					text('foo\n'),
+					node('hashtag', { hashtag: 'alice' })
+				], tokens);
+			});
 
-			const tokens3 = analyze('#Foo!');
-			assert.deepEqual([
-				node('hashtag', { hashtag: 'Foo' }),
-				text('!'),
-			], tokens3);
+			it('with text', () => {
+				const tokens = analyze('Strawberry Pasta #alice');
+				assert.deepEqual([
+					text('Strawberry Pasta '),
+					node('hashtag', { hashtag: 'alice' })
+				], tokens);
+			});
+
+			it('ignore comma and period', () => {
+				const tokens = analyze('Foo #bar, baz #piyo.');
+				assert.deepEqual([
+					text('Foo '),
+					node('hashtag', { hashtag: 'bar' }),
+					text(', baz '),
+					node('hashtag', { hashtag: 'piyo' }),
+					text('.'),
+				], tokens);
+			});
+
+			it('ignore exclamation mark', () => {
+				const tokens = analyze('#Foo!');
+				assert.deepEqual([
+					node('hashtag', { hashtag: 'Foo' }),
+					text('!'),
+				], tokens);
+			});
 		});
 
 		describe('quote', () => {