晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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'use strict'

var defaultTemplate = {
  package: {
    version: '',
    dependencies: {},
    devDependencies: {},
    optionalDependencies: {}
  },
  loaded: false,
  children: [],
  requiredBy: [],
  requires: [],
  missingDeps: {},
  missingDevDeps: {},
  phantomChildren: {},
  path: null,
  realpath: null,
  location: null,
  userRequired: false,
  save: false,
  saveSpec: null,
  isTop: false,
  fromBundle: false
}

function isLink (node) {
  return node && node.isLink
}
function isInLink (node) {
  return node && (node.isInLink || node.isLink)
}

var create = exports.create = function (node, template, isNotTop) {
  if (!template) template = defaultTemplate
  Object.keys(template).forEach(function (key) {
    if (template[key] != null && typeof template[key] === 'object' && !(template[key] instanceof Array)) {
      if (!node[key]) node[key] = {}
      return create(node[key], template[key], true)
    }
    if (node[key] != null) return
    node[key] = template[key]
  })
  if (!isNotTop) {
    // isLink is true for the symlink and everything inside it.
    // by contrast, isInLink is true for only the things inside a link
    if (node.isLink == null) node.isLink = isLink(node.parent)
    if (node.isInLink == null) node.isInLink = isInLink(node.parent)
    if (node.fromBundle == null) {
      node.fromBundle = false
    }
  }
  return node
}

exports.reset = function (node) {
  reset(node, new Set())
}

function reset (node, seen) {
  if (seen.has(node)) return
  seen.add(node)
  var child = create(node)

  // FIXME: cleaning up after read-package-json's mess =(
  if (child.package._id === '@') delete child.package._id

  child.isTop = false
  child.requiredBy = []
  child.requires = []
  child.missingDeps = {}
  child.missingDevDeps = {}
  child.phantomChildren = {}
  child.location = null

  child.children.forEach(function (child) { reset(child, seen) })
}