add types.toIdentifier

lib/6to5/types/index.js

@@ -1,6 +1,4 @@
-var traverse = require("../traverse");
-var n        = require("ast-types").namedTypes;
-var _        = require("lodash");
+var _ = require("lodash");
 
 var t = exports;
 
@@ -86,6 +84,23 @@ t.isReferenced = function (node, parent) {
   return false;
 };
 
+t.toIdentifier = function (name) {
+  if (t.isIdentifier(name)) return name.name;
+
+  // replace all non-valid identifiers with dashes
+  name = name.replace(/[^a-zA-Z0-9]/g, "-");
+
+  // remove all dashes and numbers from start of name
+  name = name.replace(/^[-0-9]+/, "");
+
+  // camel case
+  name = name.replace(/[-_\s]+(.)?/g, function (match, c) {
+    return c ? c.toUpperCase() : "";
+  });
+
+  return name;
+};
+
 t.ensureBlock = function (node) {
   node.body = t.toBlock(node.body, node);
 };
@@ -127,7 +142,7 @@ t.toBlock = function (node, parent) {
   }
 
   if (!_.isArray(node)) {
-    if (!n.Statement.check(node)) {
+    if (!t.isStatement(node)) {
       if (t.isFunction(parent)) {
         node = t.returnStatement(node);
       } else {