@tiwarivikram/meanio/lib/core_modules/menu/MenuItem.js

Extracted functionality for MEAN.io

'use strict'
var _ = require('lodash')

// MenuItem class
function MenuItem (options) {
  options = _.assign({name: null, title: null, link: null, roles: null}, options)
  options.name = options.name || (options.link ? options.link.replace('/', '_') : undefined) || options.title
  this.name = options.name
  this.title = options.title
  this.link = options.link
  this.roles = options.roles
  this.icon = options.icon
  this.weight = options.weight
  this.submenus = options.submenus || []
}

MenuItem.prototype.strip = function () {
  return {
    name: this.name,
    title: this.title,
    link: this.link,
    roles: this.roles,
    icon: this.icon,
    weight: this.weight,
    submenus: this.submenus.map(mapDoStrip)
  }
}

MenuItem.hasRole = function (role, roles) {
  return (roles.indexOf(role) > -1)
}

MenuItem.prototype.props = function () {
  return {
    name: this.name,
    title: this.title,
    link: this.link,
    icon: this.icon,
    weight: this.weight,
    roles: this.roles
  }
}

MenuItem.prototype.findOrCreate = function (path) {
  if (!path.length) return this
  var p = path.shift()
  var index = this.list().indexOf(p)
  if (index > -1) return this.submenus[index].findOrCreate(path)
  var n = new MenuItem()
  n.name = p
  this.submenus.push(n)
  return n.findOrCreate(path)
}

MenuItem.prototype.list = function () {
  return this.submenus.map(extractNames)
}

MenuItem.prototype.get = function (roles, path) {
  roles = roles ? roles.slice() : []
  if (roles.indexOf('anonymous') < 0 && roles.indexOf('authenticated') < 0) {
    roles.push('authenticated')
  }
  if (roles.indexOf('all') < 0) roles.push('all')

  var list = this.list()
  if (path) {
    if (!path.length) return this
    var n = path.shift()
    var index = list.indexOf(n)
    return this.submenus[index] ? this.submenus[index].get(roles, path) : undefined
  }

  if (this.roles) {
    if (!_.intersection(this.roles, roles).length) return undefined
  }

  return new MenuItem({
    roles: this.roles || null,
    link: this.link || null,
    title: this.title || null,
    name: this.name || null,
    icon: this.icon || null,
    weight: this.weight || null,
    submenus: this.submenus.map(get_get.bind(null, roles)).filter(remove_nulls)
  })
}

MenuItem.prototype.add = function (mi) {
  var index = this.list().indexOf(mi.name)
  var itm
  if (index > -1) {
    var ts = mi.props()
    itm = this.submenus[index]
    for (var i in ts) itm[i] = ts[i]
  }else {
    itm = mi
    this.submenus.push(itm)
  }
  return itm
}

// helper functions
function extractNames (v) {
  return v.name
}

function get_get (roles, v) {
  return v.get(roles)
}

function remove_nulls (v) {
  return v
}

function mapDoStrip (v) {
  return v ? v.strip() : undefined
}

module.exports = MenuItem