remove ParenthesizedExpression

lib/6to5/generation/generator.js

@@ -156,7 +156,7 @@ CodeGenerator.prototype.print = function (node, parent, opts) {
 
     // only compute if this node needs parens if our parent has been changed
     // since acorn would've wrapped us in a ParanthesizedExpression
-    var needsParens = parent !== node._parent && n.needsParens(node, parent);
+    var needsParens = n.needsParens(node, parent);
     if (needsParens) this.push("(");
 
     this[node.type](node, this.buildPrint(node), parent);

lib/6to5/generation/generators/expressions.js

@@ -18,12 +18,6 @@ exports.UnaryExpression = function (node, print) {
   print(node.argument);
 };
 
-exports.ParenthesizedExpression = function (node, print) {
-  this.push("(");
-  print(node.expression);
-  this.push(")");
-};
-
 exports.UpdateExpression = function (node, print) {
   if (node.prefix) {
     this.push(node.operator);
@@ -98,8 +92,11 @@ exports.AssignmentExpression = function (node, print) {
   print(node.right);
 };
 
+var SCIENTIFIC_NOTATION = /e/i;
+
 exports.MemberExpression = function (node, print) {
-  print(node.object);
+  var obj = node.object;
+  print(obj);
 
   if (node.computed) {
     this.push("[");
@@ -107,7 +104,7 @@ exports.MemberExpression = function (node, print) {
     this.push("]");
   } else {
     // 5..toFixed(2);
-    if (t.isLiteral(node.object) && util.isInteger(node.object.value)) {
+    if (t.isLiteral(obj) && util.isInteger(obj.value) && !SCIENTIFIC_NOTATION.test(obj.value.toString())) {
       this.push(".");
     }
 

lib/6to5/generation/node/parentheses.js

@@ -92,13 +92,6 @@ exports.YieldExpression = function (node, parent) {
          t.isYieldExpression(parent);
 };
 
-exports.Literal = function (node, parent) {
-  // (1).valueOf()
-  if (_.isNumber(node.value) && t.isMemberExpression(parent) && parent.object === node) {
-    return true;
-  }
-};
-
 exports.ClassExpression = function (node, parent) {
   return t.isExpressionStatement(parent);
 };

lib/6to5/transformation/transformers/es6-computed-property-names.js

@@ -25,7 +25,7 @@ exports.ObjectExpression = function (node, parent, file) {
     OBJECT: node
   });
 
-  var containerCallee = container.callee.expression;
+  var containerCallee = container.callee;
   var containerBody = containerCallee.body.body;
 
   containerCallee._aliasFunction = true;

lib/6to5/transformation/transformers/es6-template-literals.js

@@ -36,10 +36,7 @@ exports.TemplateLiteral = function (node) {
     nodes.push(t.literal(elem.value.cooked));
 
     var expr = node.expressions.shift();
-    if (expr) {
-      if (t.isBinary(expr)) expr = t.parenthesizedExpression(expr);
-      nodes.push(expr);
-    }
+    if (expr) nodes.push(expr);
   }
 
   if (nodes.length > 1) {

lib/6to5/transformation/transformers/es7-array-comprehension.js

@@ -33,7 +33,7 @@ var multiple = function (node, file) {
   });
   container.callee.expression._aliasFunction = true;
 
-  var block = container.callee.expression.body;
+  var block = container.callee.body;
   var body  = block.body;
 
   var returnStatement = body.pop();

lib/6to5/traverse/index.js

@@ -96,7 +96,6 @@ traverse.removeProperties = function (tree) {
     delete node._declarations;
     delete node.extendedRange;
     delete node._scopeInfo;
-    delete node._parent;
     delete node._scope;
     delete node.tokens;
     delete node.range;

lib/6to5/types/builder-keys.json

@@ -16,7 +16,6 @@
   "MemberExpression":        ["object", "property", "computed"],
   "NewExpression":           ["callee", "arguments"],
   "ObjectExpression":        ["properties"],
-  "ParenthesizedExpression": ["expression"],
   "Program":                 ["body"],
   "Property":                ["kind", "key", "value", "computed"],
   "ReturnStatement":         ["argument"],

lib/6to5/types/index.js

@@ -116,7 +116,7 @@ t.shallowEqual = function (actual, expected) {
 //
 
 t.isDynamic = function (node) {
-  if (t.isParenthesizedExpression(node) || t.isExpressionStatement(node)) {
+  if (t.isExpressionStatement(node)) {
     return t.isDynamic(node.expression);
   } else if (t.isIdentifier(node) || t.isLiteral(node) || t.isThisExpression(node)) {
     return false;
@@ -262,7 +262,6 @@ t.getIds.nodes = {
   VariableDeclarator: "id",
   FunctionDeclaration: "id",
   ClassDeclaration: "id",
-  ParenthesizedExpression: "expression",
   MemeberExpression: "object",
   SpreadElement: "argument",
   Property: "value"

lib/6to5/types/visitor-keys.json

@@ -45,7 +45,6 @@
   "NewExpression":             ["callee", "arguments"],
   "ObjectExpression":          ["properties"],
   "ObjectPattern":             ["properties"],
-  "ParenthesizedExpression":   ["expression"],
   "PrivateDeclaration":        ["declarations"],
   "Program":                   ["body"],
   "Property":                  ["key", "value"],

lib/6to5/util.js

@@ -161,8 +161,6 @@ exports.template = function (name, nodes, keepExpression) {
 
   if (!keepExpression && t.isExpressionStatement(node)) {
     node = node.expression;
-
-    if (t.isParenthesizedExpression(node)) node = node.expression;
   }
 
   return node;
@@ -209,13 +207,7 @@ exports.repeat = function (width, cha) {
 
 exports.normaliseAst = function (ast, comments, tokens) {
   if (ast && ast.type === "Program") {
-    ast = t.file(ast, comments || [], tokens || []);
-
-    traverse(ast, function (node, parent) {
-      node._parent = parent;
-    });
-
-    return ast;
+    return t.file(ast, comments || [], tokens || []);
   } else {
     throw new Error("Not a valid ast?");
   }
@@ -228,7 +220,6 @@ exports.parse = function (opts, code, callback) {
 
     var ast = acorn.parse(code, {
       allowReturnOutsideFunction: true,
-      preserveParens:             true,
       ecmaVersion:                opts.experimental ? 7 : 6,
       playground:                 opts.playground,
       strictMode:                 true,