From 27ba4b2bba6d9c2caa7266a3706ef575e8539a23 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Sun, 16 Nov 2014 14:33:16 +1100
Subject: [PATCH] scope: switch over declaration building to info so we can
 build multiple things

---
 lib/6to5/traverse/scope.js | 41 ++++++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/lib/6to5/traverse/scope.js b/lib/6to5/traverse/scope.js
index 335fe9d942..420c656b8b 100644
--- a/lib/6to5/traverse/scope.js
+++ b/lib/6to5/traverse/scope.js
@@ -9,24 +9,31 @@ var FOR_KEYS = ["left", "init"];
 function Scope(parent, block) {
   this.parent = parent;
   this.block  = block;
-  this.ids    = this.getIds();
 
-  this.getIds();
+  this.info         = this.getInfo();
+  this.declarations = this.info.declarations;
+  this.references   = this.info.references;
 }
 
-Scope.prototype.getIds = function () {
+Scope.prototype.getInfo = function () {
   var block = this.block;
-  if (block._scopeIds) return block._scopeIds;
+  if (block._scope) return block._scope;
 
   var self = this;
-  var ids  = block._scopeIds = {};
+  var info = block._scope = {
+    declarations: {}
+  };
+
+  var add = function (node) {
+    self.addDeclaration(node, info.declarations);
+  };
 
   // ForStatement - left, init
 
   if (t.isFor(block)) {
     _.each(FOR_KEYS, function (key) {
       var node = block[key];
-      if (t.isLet(node)) self.add(node, ids);
+      if (t.isLet(node)) add(node);
     });
 
     block = block.body;
@@ -37,14 +44,14 @@ Scope.prototype.getIds = function () {
   if (t.isBlockStatement(block) || t.isProgram(block)) {
     _.each(block.body, function (node) {
       // check for non-var `VariableDeclaration`s
-      if (t.isLet(node)) self.add(node, ids);
+      if (t.isLet(node)) add(node);
     });
   }
 
   // CatchClause - param
 
   if (t.isCatchClause(block)) {
-    self.add(block.param, ids);
+    add(block.param);
   }
 
   // Program, Function - var variables
@@ -54,7 +61,7 @@ Scope.prototype.getIds = function () {
       if (t.isFor(node)) {
         _.each(FOR_KEYS, function (key) {
           var declar = node[key];
-          if (t.isVar(declar)) self.add(declar, ids);
+          if (t.isVar(declar)) add(declar);
         });
       }
 
@@ -65,26 +72,26 @@ Scope.prototype.getIds = function () {
       // we've ran into a declaration!
       // we'll let the BlockStatement scope deal with `let` declarations
       if (t.isDeclaration(node) && !t.isLet(node)) {
-        self.add(node, ids);
+        add(node);
       }
     });
   }
 
-  // Function - params
+  // Function - params, rest
 
   if (t.isFunction(block)) {
-    this.add(block.rest, ids);
+    add(block.rest);
     _.each(block.params, function (param) {
-      self.add(param, ids);
+      add(param);
     });
   }
 
-  return ids;
+  return info;
 };
 
-Scope.prototype.add = function (node, ids) {
+Scope.prototype.addDeclaration = function (node, declarations) {
   if (!node) return;
-  _.merge(ids || this.ids, t.getIds(node, true));
+  _.merge(declarations || this.declarations, t.getIds(node, true));
 };
 
 Scope.prototype.get = function (id) {
@@ -92,7 +99,7 @@ Scope.prototype.get = function (id) {
 };
 
 Scope.prototype.getOwn = function (id) {
-  return _.has(this.ids, id) && this.ids[id];
+  return _.has(this.declarations, id) && this.declarations[id];
 };
 
 Scope.prototype.parentGet = function (id) {