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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sh-3ll 1.0
DIR:/lib/node_modules/npm/node_modules/pacote/lib/
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Current File : //lib/node_modules/npm/node_modules/pacote/lib/fetch.js
'use strict'

const duck = require('protoduck')

const Fetcher = duck.define(['spec', 'opts', 'manifest'], {
  packument: ['spec', 'opts'],
  manifest: ['spec', 'opts'],
  tarball: ['spec', 'opts'],
  fromManifest: ['manifest', 'spec', 'opts'],
  clearMemoized () {}
}, { name: 'Fetcher' })
module.exports = Fetcher

module.exports.packument = packument
function packument (spec, opts) {
  const fetcher = getFetcher(spec.type)
  return fetcher.packument(spec, opts)
}

module.exports.manifest = manifest
function manifest (spec, opts) {
  const fetcher = getFetcher(spec.type)
  return fetcher.manifest(spec, opts)
}

module.exports.tarball = tarball
function tarball (spec, opts) {
  return getFetcher(spec.type).tarball(spec, opts)
}

module.exports.fromManifest = fromManifest
function fromManifest (manifest, spec, opts) {
  return getFetcher(spec.type).fromManifest(manifest, spec, opts)
}

const fetchers = {}

module.exports.clearMemoized = clearMemoized
function clearMemoized () {
  Object.keys(fetchers).forEach(k => {
    fetchers[k].clearMemoized()
  })
}

function getFetcher (type) {
  if (!fetchers[type]) {
    // This is spelled out both to prevent sketchy stuff and to make life
    // easier for bundlers/preprocessors.
    switch (type) {
      case 'alias':
        fetchers[type] = require('./fetchers/alias')
        break
      case 'directory':
        fetchers[type] = require('./fetchers/directory')
        break
      case 'file':
        fetchers[type] = require('./fetchers/file')
        break
      case 'git':
        fetchers[type] = require('./fetchers/git')
        break
      case 'hosted':
        fetchers[type] = require('./fetchers/hosted')
        break
      case 'range':
        fetchers[type] = require('./fetchers/range')
        break
      case 'remote':
        fetchers[type] = require('./fetchers/remote')
        break
      case 'tag':
        fetchers[type] = require('./fetchers/tag')
        break
      case 'version':
        fetchers[type] = require('./fetchers/version')
        break
      default:
        throw new Error(`Invalid dependency type requested: ${type}`)
    }
  }
  return fetchers[type]
}