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resolve.coffee 

Module = require('module')

pathモジュール

join

joinする

extname

拡張子名が返る（ドットはついたまま）

dirname

ディレクトリ名が返る

basename

path.basename('/foo/bar/baz/asdf/quux.html') // returns 'quux.html'

path.basename('/foo/bar/baz/asdf/quux.html', '.html') // returns 'quux'

resolve

絶対パスをつくる

 
{join, extname, dirname, basename, resolve} = require('path')

/からはじまるかどうか

 
isAbsolute = (path) -> /^\//.test(path)

Normalize paths and remove extensions to create valid CommonJS module names

 
modulerize = (id, filename = id) ->
  ext = extname(filename)
  modName = join(dirname(id), basename(id, ext))
  modName.replace('\\', '/');

現在のディレクトリを_nodeModulePathsに設定

 
modulePaths = Module._nodeModulePaths(process.cwd())

invalidDirs = ['/', '.']

repl =
  id: 'repl'
  filename: join(process.cwd(), 'repl')
  paths: modulePaths

Resolves a require() call. Pass in the name of the module where the call was made, and the path that was required. Returns an array of: [moduleName, scriptPath]

 
module.exports = (request, parent = repl) ->

Moduleの内部メソッド _resolveLookupPaths

Module.resolveLookupPaths('spine') [ 'spine', [ '/Users/kzfm/.nvm/v0.6.14/lib/nodemodules', '/Users/kzfm/.nodemodules', '/Users/kzfm/.nodelibraries', '/Users/kzfm/.nvm/v0.6.14/lib/node' ] ]

pathsが帰ってくるので_findPathで探す

Module.findPath('hem',paths) '/Users/kzfm/.nvm/v0.6.14/lib/nodemodules/hem/lib/hem.js'

dirにfilenameを突っ込んでるのは?

 
  [_, paths]  = Module._resolveLookupPaths(request, parent)
  filename    = Module._findPath(request, paths)
  dir         = filename

  throw("Cannot find module: #{request}. Have you run `npm install .` ?") unless filename

Find package root relative to localModules folder

 
  while dir not in invalidDirs and dir not in modulePaths
    dir = dirname(dir)

  throw("Load path not found for #{filename}") if dir in invalidDirs

filenameからdir部分を削る

 
  id = filename.replace("#{dir}/", '')

CommonJSのモジュール名とファイル名を返す modulerize参照

 
  [modulerize(id, filename), filename]

module.exports.paths = (filename) ->
  Module._nodeModulePaths(dirname(filename))

module.exports.modulerize = modulerize