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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Current File : //lib/node_modules/npm/lib/install/decompose-actions.js
'use strict'
var validate = require('aproba')
var npm = require('../npm.js')

module.exports = function (differences, decomposed, next) {
  validate('AAF', arguments)
  differences.forEach((action) => {
    var cmd = action[0]
    var pkg = action[1]
    switch (cmd) {
      case 'add':
        addSteps(decomposed, pkg)
        break
      case 'update':
        updateSteps(decomposed, pkg)
        break
      case 'move':
        moveSteps(decomposed, pkg)
        break
      case 'remove':
        removeSteps(decomposed, pkg)
        break
      default:
        defaultSteps(decomposed, cmd, pkg)
    }
  })
  next()
}

function addAction (decomposed, action, pkg) {
  if (decomposed.some((_) => _[0] === action && _[1] === pkg)) return
  decomposed.push([action, pkg])
}

function addSteps (decomposed, pkg) {
  if (pkg.fromBundle) {
    // make sure our source module exists to extract ourselves from
    // if we're installing our source module anyway, the duplication
    // of these steps will be elided by `addAction` automatically
    addAction(decomposed, 'fetch', pkg.fromBundle)
    addAction(decomposed, 'extract', pkg.fromBundle)
  }
  if (!pkg.fromBundle && !pkg.isLink) {
    addAction(decomposed, 'fetch', pkg)
    addAction(decomposed, 'extract', pkg)
  }
  if (!pkg.fromBundle || npm.config.get('rebuild-bundle')) {
    addAction(decomposed, 'preinstall', pkg)
    addAction(decomposed, 'build', pkg)
    addAction(decomposed, 'install', pkg)
    addAction(decomposed, 'postinstall', pkg)
  }
  if (!pkg.fromBundle || !pkg.isLink) {
    addAction(decomposed, 'finalize', pkg)
  }
  addAction(decomposed, 'refresh-package-json', pkg)
}

function updateSteps (decomposed, pkg) {
  removeSteps(decomposed, pkg.oldPkg)
  addSteps(decomposed, pkg)
}

function removeSteps (decomposed, pkg) {
  addAction(decomposed, 'unbuild', pkg)
  addAction(decomposed, 'remove', pkg)
}

function moveSteps (decomposed, pkg) {
  addAction(decomposed, 'move', pkg)
  addAction(decomposed, 'build', pkg)
  addAction(decomposed, 'install', pkg)
  addAction(decomposed, 'postinstall', pkg)
  addAction(decomposed, 'refresh-package-json', pkg)
}

function defaultSteps (decomposed, cmd, pkg) {
  addAction(decomposed, cmd, pkg)
}