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node_modules/are-we-there-yet/tracker.js 826 Bytes
aaac7fed   liuqimichale   add
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  'use strict'
  var util = require('util')
  var TrackerBase = require('./tracker-base.js')
  
  var Tracker = module.exports = function (name, todo) {
    TrackerBase.call(this, name)
    this.workDone = 0
    this.workTodo = todo || 0
  }
  util.inherits(Tracker, TrackerBase)
  
  Tracker.prototype.completed = function () {
    return this.workTodo === 0 ? 0 : this.workDone / this.workTodo
  }
  
  Tracker.prototype.addWork = function (work) {
    this.workTodo += work
    this.emit('change', this.name, this.completed(), this)
  }
  
  Tracker.prototype.completeWork = function (work) {
    this.workDone += work
    if (this.workDone > this.workTodo) this.workDone = this.workTodo
    this.emit('change', this.name, this.completed(), this)
  }
  
  Tracker.prototype.finish = function () {
    this.workTodo = this.workDone = 1
    this.emit('change', this.name, 1, this)
  }