From 54a2a47030f1ed0af654185fdc5bf56e50858023 Mon Sep 17 00:00:00 2001
From: Amjad Masad <amjad.masad@gmail.com>
Date: Tue, 1 Dec 2015 10:37:58 -0800
Subject: [PATCH] Fix spacing in binary expression when right is a binary
 expression and has a unary on the left

---
 .../babel-generator/src/generators/expressions.js     | 11 ++++++++++-
 .../fixtures/compact/binary-expressions/actual.js     |  2 ++
 .../fixtures/compact/binary-expressions/expected.js   |  2 +-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/packages/babel-generator/src/generators/expressions.js b/packages/babel-generator/src/generators/expressions.js
index ffe55eb3f1..12ab9f195b 100644
--- a/packages/babel-generator/src/generators/expressions.js
+++ b/packages/babel-generator/src/generators/expressions.js
@@ -172,7 +172,9 @@ export function AssignmentExpression(node: Object, parent: Object) {
              t.isUnaryExpression(node.right.argument, { prefix: true, operator: "--" }) ||
              // Need spaces for operators of the same kind to avoid: `a+++b`
              t.isUnaryExpression(node.right, { prefix: true, operator: node.operator }) ||
-             t.isUpdateExpression(node.right, { prefix: true, operator: node.operator + node.operator });
+             t.isUpdateExpression(node.right, { prefix: true, operator: node.operator + node.operator }) ||
+             (t.isBinaryExpression(node.right) &&
+               t.isUnaryExpression(getLeftMost(node.right), { prefix: true, operator: node.operator }));
 
   }
 
@@ -230,3 +232,10 @@ export function MetaProperty(node: Object) {
   this.push(".");
   this.print(node.property, node);
 }
+
+function getLeftMost(binaryExpr) {
+  if (!t.isBinaryExpression(binaryExpr)) {
+    return binaryExpr;
+  }
+  return getLeftMost(binaryExpr.left);
+}
diff --git a/packages/babel-generator/test/fixtures/compact/binary-expressions/actual.js b/packages/babel-generator/test/fixtures/compact/binary-expressions/actual.js
index bf66e42564..1f6981f34e 100644
--- a/packages/babel-generator/test/fixtures/compact/binary-expressions/actual.js
+++ b/packages/babel-generator/test/fixtures/compact/binary-expressions/actual.js
@@ -2,3 +2,5 @@
 1 && 1;
 1 + +1;
 x + ++y;
+(a+(+b)*2);
+a + + b * 2 * 2 * 2;
diff --git a/packages/babel-generator/test/fixtures/compact/binary-expressions/expected.js b/packages/babel-generator/test/fixtures/compact/binary-expressions/expected.js
index 169312ebfc..d4df4b13e1 100644
--- a/packages/babel-generator/test/fixtures/compact/binary-expressions/expected.js
+++ b/packages/babel-generator/test/fixtures/compact/binary-expressions/expected.js
@@ -1 +1 @@
-1*1;1&&1;1+ +1;x+ ++y;
+1*1;1&&1;1+ +1;x+ ++y;a+ +b*2;a+ +b*2*2*2;