js/libs/ember-1.5.1.js
function(path, data) {
    var normalized = Ember.Handlebars.normalizePath(null, path, data);
    if (normalized.isKeyword) {
      return 'templateData.keywords.' + path;
    } else if (Ember.isGlobalPath(path)) {
      return null;
    } else if (path === 'this' || path === '') {
      return '_parentView.context';
    } else {
      return '_parentView.context.' + path;
    }
  }
function(path, data) {
    var normalized = Ember.Handlebars.normalizePath(null, path, data);
    if (normalized.isKeyword) {
      return 'templateData.keywords.' + path;
    } else if (Ember.isGlobalPath(path)) {
      return null;
    } else if (path === 'this' || path === '') {
      return '_parentView.context';
    } else {
      return '_parentView.context.' + path;
    }
  }
Transform bindings from the current context to a context that can be evaluated within the view. Returns null if the path shouldn't be changed.  TODO: consider the addition of a prefix that would allow this method to return `path`.