From 9edbc9971f565d9021f765794a93fa33dd6e1d21 Mon Sep 17 00:00:00 2001
From: Sukka <isukkaw@gmail.com>
Date: Fri, 1 Oct 2021 21:30:35 +0800
Subject: [PATCH] fix(#4780): empty tag name correction (#4786)

---
 lib/hexo/post.js          |  2 +-
 test/scripts/hexo/post.js | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/lib/hexo/post.js b/lib/hexo/post.js
index 9db255d437..462f650ffc 100644
--- a/lib/hexo/post.js
+++ b/lib/hexo/post.js
@@ -102,7 +102,7 @@ class PostRenderEscape {
       } else if (state === STATE_SWIG_TAG) {
         if (char === '%' && next_char === '}') { // From swig back to plain text
           idx++;
-          if (str.includes(`end${swig_tag_name}`)) {
+          if (swig_tag_name !== '' && str.includes(`end${swig_tag_name}`)) {
             state = STATE_SWIG_FULL_TAG;
           } else {
             swig_tag_name = '';
diff --git a/test/scripts/hexo/post.js b/test/scripts/hexo/post.js
index c9fdbc6060..ccedb78a82 100644
--- a/test/scripts/hexo/post.js
+++ b/test/scripts/hexo/post.js
@@ -1357,4 +1357,22 @@ describe('Post', () => {
     hexo.config.prismjs.enable = false;
     hexo.config.highlight.enable = true;
   });
+
+  it('render() - empty tag name', async () => {
+    hexo.config.prismjs.enable = true;
+    hexo.config.highlight.enable = false;
+
+    const content = 'Disable rendering of Nunjucks tag `{{ }}` / `{% %}`';
+
+    const data = await post.render(null, {
+      content,
+      engine: 'markdown'
+    });
+
+    data.content.should.include(escapeSwigTag('{{ }}'));
+    data.content.should.include(escapeSwigTag('{% %}'));
+
+    hexo.config.prismjs.enable = false;
+    hexo.config.highlight.enable = true;
+  });
 });