UglifyJS-0001-Fix-broken-calls-of-complex-binary-expressions-471

UglifyJS-0001-Fix-broken-calls-of-complex-binary-expressions-471.patch

From 46089d511b7f7d718b79c4ce8a685366e1c73161 Mon Sep 17 00:00:00 2001
From: Andrey Tarantsov <andrey@tarantsov.com>
Date: Thu, 1 Nov 2012 10:10:34 +0700
Subject: [PATCH] Fix broken calls of complex binary expressions [#471]

When deciding whether to parenthesize the expression being called, a
simple test of f.charAt(0) results in a broken code when calling a
complex expression which just happens to start with a paren but is
not actually parenthesized.

As an example, the code in issue471.js (see the diff) used to
incorrectly output `(a||b)&&c()`.
---
 lib/process.js                          |    5 ++++-
 test/unit/compress/expected/issue471.js |    1 +
 test/unit/compress/test/issue471.js     |    1 +
 3 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 test/unit/compress/expected/issue471.js
 create mode 100644 test/unit/compress/test/issue471.js

diff --git a/lib/process.js b/lib/process.js
index 42d61df..b4f8e53 100644
--- a/lib/process.js
+++ b/lib/process.js
@@ -1733,7 +1733,10 @@ function gen_code(ast, options) {
         },
         "call": function(func, args) {
             var f = make(func);
-            if (f.charAt(0) != "(" && needs_parens(func))
+            // cannot simply test the first and/or the last characters in the genetic case,
+            // because the called expression might look like e.g. `(x || y) && (u || v)`.
+            var already_wrapped = (func[0] == "function" && f.charAt(0) == "(");
+            if (!already_wrapped && needs_parens(func))
                 f = "(" + f + ")";
             return f + "(" + add_commas(MAP(args, function(expr){
                 return parenthesize(expr, "seq");
diff --git a/test/unit/compress/expected/issue471.js b/test/unit/compress/expected/issue471.js
new file mode 100644
index 0000000..7aebe09
--- /dev/null
+++ b/test/unit/compress/expected/issue471.js
@@ -0,0 +1 @@
+((a||b)&&c)()
diff --git a/test/unit/compress/test/issue471.js b/test/unit/compress/test/issue471.js
new file mode 100644
index 0000000..b0f4613
--- /dev/null
+++ b/test/unit/compress/test/issue471.js
@@ -0,0 +1 @@
+((a || b) && c)();
-- 
1.7.9.6 (Apple Git-31.1)