From dfe0d03de4ddf651b3b7b27557e4be8821ed137d Mon Sep 17 00:00:00 2001
From: uiolee <22849383+uiolee@users.noreply.github.com>
Date: Sun, 14 Jan 2024 14:34:55 +0800
Subject: [PATCH 1/3] fix: check tag completeness

---
 lib/hexo/post.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/hexo/post.ts b/lib/hexo/post.ts
index f9269484e2..cc74567d38 100644
--- a/lib/hexo/post.ts
+++ b/lib/hexo/post.ts
@@ -84,13 +84,14 @@ class PostRenderEscape {
 
       if (state === STATE_PLAINTEXT) { // From plain text to swig
         if (char === '{') {
-          if (next_char === '{') {
+          // check if it is a complete tag {{ }}
+          if (next_char === '{' && /\{\{.+?\}\}/.test(str)) {
             state = STATE_SWIG_VAR;
             idx++;
-          } else if (next_char === '#') {
+          } else if (next_char === '#' && /\{#.+?#\}/.test(str)) {
             state = STATE_SWIG_COMMENT;
             idx++;
-          } else if (next_char === '%') {
+          } else if (next_char === '%' && /\{%.+?%\}/.test(str)) {
             state = STATE_SWIG_TAG;
             idx++;
             swig_tag_name = '';

From 8fd34c9364cca1f49865e73bed4e5c0013ff2134 Mon Sep 17 00:00:00 2001
From: uiolee <22849383+uiolee@users.noreply.github.com>
Date: Sun, 14 Jan 2024 15:35:31 +0800
Subject: [PATCH 2/3] test(escapeTag): dont drop uncomplete tags

---
 test/scripts/hexo/post.js | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/test/scripts/hexo/post.js b/test/scripts/hexo/post.js
index 6dd792f617..cf7dd423b2 100644
--- a/test/scripts/hexo/post.js
+++ b/test/scripts/hexo/post.js
@@ -12,7 +12,7 @@ const escapeSwigTag = str => str.replace(/{/g, '&#123;').replace(/}/g, '&#125;')
 describe('Post', () => {
   const Hexo = require('../../../dist/hexo');
   const hexo = new Hexo(join(__dirname, 'post_test'));
-  require('../../../lib/plugins/highlight/')(hexo);
+  require('../../../dist/plugins/highlight/')(hexo);
   const { post } = hexo;
   const now = Date.now();
   let clock;
@@ -1369,4 +1369,31 @@ describe('Post', () => {
 
     hexo.config.syntax_highlighter = 'highlight.js';
   });
+
+  // https://github.com/hexojs/hexo/issues/5301
+  it('render() - dont escape uncomplete tags', async () => {
+    const content = 'dont drop `{% }` 11111 `{# }` 22222 `{{ }` 33333';
+
+    const data = await post.render(null, {
+      content,
+      engine: 'markdown'
+    });
+
+    data.content.should.contains('11111');
+    data.content.should.contains('22222');
+    data.content.should.contains('33333');
+    data.content.should.not.contains('&#96;'); // `
+  });
+
+  it('render() - uncomplete tags throw error', async () => {
+    const content = 'nunjucks should thorw {#  } error';
+
+    try {
+      await post.render(null, {
+        content,
+        engine: 'markdown'
+      });
+      should.fail();
+    } catch (err) {}
+  });
 });

From 5dd70e8aeb30ea5968dd4bbbb3d03fdd7857a7c9 Mon Sep 17 00:00:00 2001
From: uiolee <22849383+uiolee@users.noreply.github.com>
Date: Wed, 17 Jan 2024 19:15:17 +0800
Subject: [PATCH 3/3] early return

---
 lib/hexo/post.ts | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/hexo/post.ts b/lib/hexo/post.ts
index cc74567d38..ed0c87a28e 100644
--- a/lib/hexo/post.ts
+++ b/lib/hexo/post.ts
@@ -67,6 +67,9 @@ class PostRenderEscape {
    * @returns string
    */
   escapeAllSwigTags(str: string) {
+    if (!/(\{\{.+?\}\})|(\{#.+?#\})|(\{%.+?%\})/.test(str)) {
+      return str;
+    }
     let state = STATE_PLAINTEXT;
     let buffer = '';
     let output = '';
@@ -85,13 +88,13 @@ class PostRenderEscape {
       if (state === STATE_PLAINTEXT) { // From plain text to swig
         if (char === '{') {
           // check if it is a complete tag {{ }}
-          if (next_char === '{' && /\{\{.+?\}\}/.test(str)) {
+          if (next_char === '{') {
             state = STATE_SWIG_VAR;
             idx++;
-          } else if (next_char === '#' && /\{#.+?#\}/.test(str)) {
+          } else if (next_char === '#') {
             state = STATE_SWIG_COMMENT;
             idx++;
-          } else if (next_char === '%' && /\{%.+?%\}/.test(str)) {
+          } else if (next_char === '%') {
             state = STATE_SWIG_TAG;
             idx++;
             swig_tag_name = '';