fixing issue 542. Parse error with leading object literal as part of operation.

lib/grammar.js

@@ -323,7 +323,7 @@
     ],
     SimpleArgs: [
       o("Expression"), o("SimpleArgs , Expression", function() {
-        return ($1 instanceof Array) ? $1.concat([$3]) : [$1].concat([$3]);
+        return $1 instanceof Array ? $1.concat([$3]) : [$1].concat([$3]);
       })
     ],
     Try: [

lib/helpers.js

@@ -80,7 +80,7 @@
     _b = array;
     for (_a = 0, _c = _b.length; _a < _c; _a++) {
       item = _b[_a];
-      (item instanceof Array) ? (memo = memo.concat(item)) : memo.push(item);
+      item instanceof Array ? (memo = memo.concat(item)) : memo.push(item);
     }
     return memo;
   });

lib/nodes.js

@@ -464,7 +464,7 @@
       _c = this.args;
       for (_b = 0, _d = _c.length; _b < _d; _b++) {
         arg = _c[_b];
-        (arg instanceof SplatNode) ? (compilation = this.compileSplat(o)) : null;
+        arg instanceof SplatNode ? (compilation = this.compileSplat(o)) : null;
       }
       if (!(compilation)) {
         args = (function() {
@@ -687,7 +687,7 @@
             if (i === this.properties.length - 1) {
               join = '';
             }
-            indent = (prop instanceof CommentNode) ? '' : this.idt(1);
+            indent = prop instanceof CommentNode ? '' : this.idt(1);
             if (!(prop instanceof AssignNode || prop instanceof CommentNode)) {
               prop = new AssignNode(prop, prop, 'object');
             }
@@ -1140,6 +1140,7 @@
       this.second = second;
       this.operator = this.CONVERSIONS[operator] || operator;
       this.flip = !!flip;
+      this.first instanceof ValueNode && this.first.base instanceof ObjectNode ? (this.first = new ParentheticalNode(this.first)) : null;
       return this;
     };
     __extends(OpNode, BaseNode);
@@ -1373,7 +1374,7 @@
       if (code.substr(l - 1, 1) === ';') {
         code = code.substr(o, l - 1);
       }
-      return (this.expression instanceof AssignNode) ? code : ("(" + code + ")");
+      return this.expression instanceof AssignNode ? code : ("(" + code + ")");
     };
     return ParentheticalNode;
   })();
@@ -1519,8 +1520,6 @@
       this.tags = tags || {};
       if (this.tags.invert) {
         this.condition = new OpNode('!', new ParentheticalNode(this.condition));
-      } else if (this.condition instanceof OpNode && this.condition.operator === 'instanceof') {
-        this.condition = new ParentheticalNode(this.condition);
       }
       this.elseBody = null;
       this.isChain = false;
@@ -1606,7 +1605,7 @@
       }
     };
     IfNode.prototype.ensureExpressions = function(node) {
-      return (node instanceof Expressions) ? node : new Expressions([node]);
+      return node instanceof Expressions ? node : new Expressions([node]);
     };
     IfNode.prototype.compileStatement = function(o) {
       var body, child, comDent, condO, elsePart, ifDent, ifPart;

src/nodes.coffee

@@ -1039,6 +1039,8 @@ exports.OpNode = class OpNode extends BaseNode
     @second   = second
     @operator = @CONVERSIONS[operator] or operator
     @flip     = !!flip
+    if @first instanceof ValueNode and @first.base instanceof ObjectNode
+      @first = new ParentheticalNode @first
 
   isUnary: ->
     not @second
@@ -1335,10 +1337,7 @@ exports.IfNode = class IfNode extends BaseNode
     @condition = condition
     @body      = body
     @tags      = tags or {}
-    if @tags.invert
-      @condition = new OpNode('!', new ParentheticalNode(@condition))
-    else if @condition instanceof OpNode and @condition.operator is 'instanceof'
-      @condition = new ParentheticalNode(@condition)
+    @condition = new OpNode('!', new ParentheticalNode(@condition)) if @tags.invert
     @elseBody = null
     @isChain  = false
 

test/test_if.coffee

@@ -74,3 +74,6 @@ if {} instanceof Object
   ok yes
 else
   ok no
+
+result = {} + {}
+ok result is '[object Object][object Object]'