From 0f4cfa877a9f14a75b219c04947ce5984772d8ba Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Wed, 30 Oct 2019 03:49:39 +0800
Subject: [PATCH] fix corner case in `comments` (#3550)

---
 lib/parse.js           |  2 ++
 test/mocha/comments.js | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/lib/parse.js b/lib/parse.js
index 7321878f..16d8dad3 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -1253,6 +1253,7 @@ function parse($TEXT, options) {
                 var ex = expression(true);
                 var len = start.comments_before.length;
                 [].unshift.apply(ex.start.comments_before, start.comments_before);
+                start.comments_before.length = 0;
                 start.comments_before = ex.start.comments_before;
                 start.comments_before_length = len;
                 if (len == 0 && start.comments_before.length > 0) {
@@ -1268,6 +1269,7 @@ function parse($TEXT, options) {
                 var end = prev();
                 end.comments_before = ex.end.comments_before;
                 [].push.apply(ex.end.comments_after, end.comments_after);
+                end.comments_after.length = 0;
                 end.comments_after = ex.end.comments_after;
                 ex.end = end;
                 if (ex instanceof AST_Call) mark_pure(ex);
diff --git a/test/mocha/comments.js b/test/mocha/comments.js
index 764f6db8..9a4b3be6 100644
--- a/test/mocha/comments.js
+++ b/test/mocha/comments.js
@@ -259,6 +259,30 @@ describe("comments", function() {
         assert.strictEqual(result.code, code);
     });
 
+    it("Should handle comments around parenthesis correctly", function() {
+        var code = [
+            "a();",
+            "/* foo */",
+            "(b())",
+            "/* bar */",
+            "c();",
+        ].join("\n");
+        var result = UglifyJS.minify(code, {
+            compress: false,
+            mangle: false,
+            output: {
+                comments: "all",
+            },
+        });
+        if (result.error) throw result.error;
+        assert.strictEqual(result.code, [
+            "a();",
+            "/* foo */",
+            "b()",
+            "/* bar */;c();",
+        ].join("\n"));
+    });
+
     it("Should preserve comments around IIFE", function() {
         var result = UglifyJS.minify("/*a*/(/*b*/function(){/*c*/}/*d*/)/*e*/();", {
             compress: false,
-- 
2.34.1