fix(regression): remove overly strict invalid tag format check in Swig parser (#5691)

Co-authored-by: Mimi <1119186082@qq.com>

Author: D-Sketon

lib/hexo/post.ts

@@ -151,13 +151,7 @@ class PostRenderEscape {
               swig_string_quote = '';
             }
           }
-          // {% } or {% %
-          if (((char !== '%' && next_char === '}') || (char === '%' && next_char !== '}')) && swig_string_quote === '') {
-            // From swig back to plain text
-            swig_tag_name = '';
-            state = STATE_PLAINTEXT;
-            pushAndReset(`{%${str.slice(buffer_start, idx)}${char}`);
-          } else if (char === '%' && next_char === '}' && swig_string_quote === '') { // From swig back to plain text
+          if (char === '%' && next_char === '}' && swig_string_quote === '') { // From swig back to plain text
             idx++;
             if (swig_tag_name !== '' && str.includes(`end${swig_tag_name}`)) {
               state = STATE_SWIG_FULL_TAG;

test/scripts/hexo/post.ts

@@ -1525,6 +1525,53 @@ describe('Post', () => {
     data.content.should.contains('22222');
   });
 
+  it('render() - tags with swig character', async () => {
+    const tagSpy = spy();
+    hexo.extend.tag.register('testTag', (args, content) => {
+      tagSpy(args, content);
+      return '';
+    }, {
+      ends: true
+    });
+    let content = '{% testTag 111 222 %}\n3333\n{% endtestTag %}';
+    await post.render('', {
+      content,
+      engine: 'markdown'
+    });
+    tagSpy.calledOnce.should.be.true;
+    tagSpy.firstCall.args[0].should.eql(['111', '222']);
+    tagSpy.firstCall.args[1].should.eql('3333');
+
+    content = '{% testTag 111% % 222 %}\n333\n{% endtestTag %}';
+    await post.render('', {
+      content,
+      engine: 'markdown'
+    });
+    tagSpy.calledTwice.should.be.true;
+    tagSpy.secondCall.args[0].should.eql(['111%', '%', '222']);
+    tagSpy.secondCall.args[1].should.eql('333');
+
+    content = '{% testTag 111 } 222} %}\n333\n{% endtestTag %}';
+    await post.render('', {
+      content,
+      engine: 'markdown'
+    });
+    tagSpy.calledThrice.should.be.true;
+    tagSpy.thirdCall.args[0].should.eql(['111', '}', '222}']);
+    tagSpy.thirdCall.args[1].should.eql('333');
+
+    content = '{% testTag 111 222 %}\n333% % } %}\n{% endtestTag %}';
+    await post.render('', {
+      content,
+      engine: 'markdown'
+    });
+    tagSpy.callCount.should.eql(4);
+    tagSpy.getCall(3).args[0].should.eql(['111', '222']);
+    tagSpy.getCall(3).args[1].should.eql('333% % } %}');
+
+    hexo.extend.tag.unregister('testTag');
+  });
+
   it('render() - incomplete tags throw error', async () => {
     const content = 'nunjucks should throw {#  } error';