tools/perf/utils/results_viewer/src/base.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 'use strict';
   6
   7
   8 /**
   9  * The global object.
  10  * @type {!Object}
  11  * @const
  12  */
  13 var global = this;
  14
  15
  16 /** Platform, package, object property, and Event support. */
  17 this.base = (function() {
  18
  19   function mLog(text, opt_indentLevel) {
  20     if (true)
  21       return;
  22
  23     var spacing = '';
  24     var indentLevel = opt_indentLevel || 0;
  25     for (var i = 0; i < indentLevel; i++)
  26       spacing += ' ';
  27     console.log(spacing + text);
  28   }
  29
  30   /**
  31    * Builds an object structure for the provided namespace path,
  32    * ensuring that names that already exist are not overwritten. For
  33    * example:
  34    * 'a.b.c' -> a = {};a.b={};a.b.c={};
  35    * @param {string} name Name of the object that this file defines.
  36    * @param {*=} opt_object The object to expose at the end of the path.
  37    * @param {Object=} opt_objectToExportTo The object to add the path to;
  38    *     default is {@code global}.
  39    * @private
  40    */
  41   function exportPath(name, opt_object, opt_objectToExportTo) {
  42     var parts = name.split('.');
  43     var cur = opt_objectToExportTo || global;
  44
  45     for (var part; parts.length && (part = parts.shift());) {
  46       if (!parts.length && opt_object !== undefined) {
  47         // last part and we have an object; use it
  48         cur[part] = opt_object;
  49       } else if (part in cur) {
  50         cur = cur[part];
  51       } else {
  52         cur = cur[part] = {};
  53       }
  54     }
  55     return cur;
  56   }
  57
  58   function exportTo(namespace, fn) {
  59     var obj = exportPath(namespace);
  60     try {
  61       var exports = fn();
  62     } catch (e) {
  63       console.log('While running exports for ', name, ':');
  64       console.log(e.stack || e);
  65       return;
  66     }
  67
  68     for (var propertyName in exports) {
  69       // Maybe we should check the prototype chain here? The current usage
  70       // pattern is always using an object literal so we only care about own
  71       // properties.
  72       var propertyDescriptor = Object.getOwnPropertyDescriptor(exports,
  73                                                                propertyName);
  74       if (propertyDescriptor) {
  75         Object.defineProperty(obj, propertyName, propertyDescriptor);
  76         mLog('  +' + propertyName);
  77       }
  78     }
  79   }
  80
  81   return {
  82     exportTo: exportTo
  83   };
  84 })();