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✏️ npa.js

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'use strict'
module.exports = npa
module.exports.resolve = resolve
module.exports.Result = Result

let url
let HostedGit
let semver
let path_
function path () {
  if (!path_) path_ = require('path')
  return path_
}
let validatePackageName
let osenv

const isWindows = process.platform === 'win32' || global.FAKE_WINDOWS
const hasSlashes = isWindows ? /\\|[/]/ : /[/]/
const isURL = /^(?:git[+])?[a-z]+:/i
const isFilename = /[.](?:tgz|tar.gz|tar)$/i

function npa (arg, where) {
  let name
  let spec
  if (typeof arg === 'object') {
    if (arg instanceof Result && (!where || where === arg.where)) {
      return arg
    } else if (arg.name && arg.rawSpec) {
      return npa.resolve(arg.name, arg.rawSpec, where || arg.where)
    } else {
      return npa(arg.raw, where || arg.where)
    }
  }
  const nameEndsAt = arg[0] === '@' ? arg.slice(1).indexOf('@') + 1 : arg.indexOf('@')
  const namePart = nameEndsAt > 0 ? arg.slice(0, nameEndsAt) : arg
  if (isURL.test(arg)) {
    spec = arg
  } else if (namePart[0] !== '@' && (hasSlashes.test(namePart) || isFilename.test(namePart))) {
    spec = arg
  } else if (nameEndsAt > 0) {
    name = namePart
    spec = arg.slice(nameEndsAt + 1)
  } else {
    if (!validatePackageName) validatePackageName = require('validate-npm-package-name')
    const valid = validatePackageName(arg)
    if (valid.validForOldPackages) {
      name = arg
    } else {
      spec = arg
    }
  }
  return resolve(name, spec, where, arg)
}

const isFilespec = isWindows ? /^(?:[.]|~[/]|[/\\]|[a-zA-Z]:)/ : /^(?:[.]|~[/]|[/]|[a-zA-Z]:)/

function resolve (name, spec, where, arg) {
  const res = new Result({
    raw: arg,
    name: name,
    rawSpec: spec,
    fromArgument: arg != null
  })

if (name) res.setName(name)

if (spec && (isFilespec.test(spec) || /^file:/i.test(spec))) {
    return fromFile(res, where)
  } else if (spec && /^npm:/i.test(spec)) {
    return fromAlias(res, where)
  }
  if (!HostedGit) HostedGit = require('hosted-git-info')
  const hosted = HostedGit.fromUrl(spec, {noGitPlus: true, noCommittish: true})
  if (hosted) {
    return fromHostedGit(res, hosted)
  } else if (spec && isURL.test(spec)) {
    return fromURL(res)
  } else if (spec && (hasSlashes.test(spec) || isFilename.test(spec))) {
    return fromFile(res, where)
  } else {
    return fromRegistry(res)
  }
}

function invalidPackageName (name, valid) {
  const err = new Error(`Invalid package name "${name}": ${valid.errors.join('; ')}`)
  err.code = 'EINVALIDPACKAGENAME'
  return err
}
function invalidTagName (name) {
  const err = new Error(`Invalid tag name "${name}": Tags may not have any characters that encodeURIComponent encodes.`)
  err.code = 'EINVALIDTAGNAME'
  return err
}

function Result (opts) {
  this.type = opts.type
  this.registry = opts.registry
  this.where = opts.where
  if (opts.raw == null) {
    this.raw = opts.name ? opts.name + '@' + opts.rawSpec : opts.rawSpec
  } else {
    this.raw = opts.raw
  }
  this.name = undefined
  this.escapedName = undefined
  this.scope = undefined
  this.rawSpec = opts.rawSpec == null ? '' : opts.rawSpec
  this.saveSpec = opts.saveSpec
  this.fetchSpec = opts.fetchSpec
  if (opts.name) this.setName(opts.name)
  this.gitRange = opts.gitRange
  this.gitCommittish = opts.gitCommittish
  this.hosted = opts.hosted
}

Result.prototype.setName = function (name) {
  if (!validatePackageName) validatePackageName = require('validate-npm-package-name')
  const valid = validatePackageName(name)
  if (!valid.validForOldPackages) {
    throw invalidPackageName(name, valid)
  }
  this.name = name
  this.scope = name[0] === '@' ? name.slice(0, name.indexOf('/')) : undefined
  // scoped packages in couch must have slash url-encoded, e.g. @foo%2Fbar
  this.escapedName = name.replace('/', '%2f')
  return this
}

Result.prototype.toString = function () {
  const full = []
  if (this.name != null && this.name !== '') full.push(this.name)
  const spec = this.saveSpec || this.fetchSpec || this.rawSpec
  if (spec != null && spec !== '') full.push(spec)
  return full.length ? full.join('@') : this.raw
}

Result.prototype.toJSON = function () {
  const result = Object.assign({}, this)
  delete result.hosted
  return result
}

function setGitCommittish (res, committish) {
  if (committish != null && committish.length >= 7 && committish.slice(0, 7) === 'semver:') {
    res.gitRange = decodeURIComponent(committish.slice(7))
    res.gitCommittish = null
  } else {
    res.gitCommittish = committish === '' ? null : committish
  }
  return res
}

const isAbsolutePath = /^[/]|^[A-Za-z]:/

function resolvePath (where, spec) {
  if (isAbsolutePath.test(spec)) return spec
  return path().resolve(where, spec)
}

function isAbsolute (dir) {
  if (dir[0] === '/') return true
  if (/^[A-Za-z]:/.test(dir)) return true
  return false
}

function fromFile (res, where) {
  if (!where) where = process.cwd()
  res.type = isFilename.test(res.rawSpec) ? 'file' : 'directory'
  res.where = where

const spec = res.rawSpec.replace(/\\/g, '/')
    .replace(/^file:[/]*([A-Za-z]:)/, '$1') // drive name paths on windows
    .replace(/^file:(?:[/]*([~./]))?/, '$1')
  if (/^~[/]/.test(spec)) {
    // this is needed for windows and for file:~/foo/bar
    if (!osenv) osenv = require('osenv')
    res.fetchSpec = resolvePath(osenv.home(), spec.slice(2))
    res.saveSpec = 'file:' + spec
  } else {
    res.fetchSpec = resolvePath(where, spec)
    if (isAbsolute(spec)) {
      res.saveSpec = 'file:' + spec
    } else {
      res.saveSpec = 'file:' + path().relative(where, res.fetchSpec)
    }
  }
  return res
}

function fromHostedGit (res, hosted) {
  res.type = 'git'
  res.hosted = hosted
  res.saveSpec = hosted.toString({noGitPlus: false, noCommittish: false})
  res.fetchSpec = hosted.getDefaultRepresentation() === 'shortcut' ? null : hosted.toString()
  return setGitCommittish(res, hosted.committish)
}

function unsupportedURLType (protocol, spec) {
  const err = new Error(`Unsupported URL Type "${protocol}": ${spec}`)
  err.code = 'EUNSUPPORTEDPROTOCOL'
  return err
}

function matchGitScp (spec) {
  // git ssh specifiers are overloaded to also use scp-style git
  // specifiers, so we have to parse those out and treat them special.
  // They are NOT true URIs, so we can't hand them to `url.parse`.
  //
  // This regex looks for things that look like:
  // git+ssh://git@my.custom.git.com:username/project.git#deadbeef
  //
  // ...and various combinations. The username in the beginning is *required*.
  const matched = spec.match(/^git\+ssh:\/\/([^:#]+:[^#]+(?:\.git)?)(?:#(.*))?$/i)
  return matched && !matched[1].match(/:[0-9]+\/?.*$/i) && {
    fetchSpec: matched[1],
    gitCommittish: matched[2] == null ? null : matched[2]
  }
}

function fromURL (res) {
  if (!url) url = require('url')
  const urlparse = url.parse(res.rawSpec)
  res.saveSpec = res.rawSpec
  // check the protocol, and then see if it's git or not
  switch (urlparse.protocol) {
    case 'git:':
    case 'git+http:':
    case 'git+https:':
    case 'git+rsync:':
    case 'git+ftp:':
    case 'git+file:':
    case 'git+ssh:':
      res.type = 'git'
      const match = urlparse.protocol === 'git+ssh:' && matchGitScp(res.rawSpec)
      if (match) {
        setGitCommittish(res, match.gitCommittish)
        res.fetchSpec = match.fetchSpec
      } else {
        setGitCommittish(res, urlparse.hash != null ? urlparse.hash.slice(1) : '')
        urlparse.protocol = urlparse.protocol.replace(/^git[+]/, '')
        if (urlparse.protocol === 'file:' && /^git\+file:\/\/[a-z]:/i.test(res.rawSpec)) {
          // keep the drive letter : on windows file paths
          urlparse.host += ':'
          urlparse.hostname += ':'
        }
        delete urlparse.hash
        res.fetchSpec = url.format(urlparse)
      }
      break
    case 'http:':
    case 'https:':
      res.type = 'remote'
      res.fetchSpec = res.saveSpec
      break

default:
      throw unsupportedURLType(urlparse.protocol, res.rawSpec)
  }

return res
}

function fromAlias (res, where) {
  const subSpec = npa(res.rawSpec.substr(4), where)
  if (subSpec.type === 'alias') {
    throw new Error('nested aliases not supported')
  }
  if (!subSpec.registry) {
    throw new Error('aliases only work for registry deps')
  }
  res.subSpec = subSpec
  res.registry = true
  res.type = 'alias'
  res.saveSpec = null
  res.fetchSpec = null
  return res
}

function fromRegistry (res) {
  res.registry = true
  const spec = res.rawSpec === '' ? 'latest' : res.rawSpec
  // no save spec for registry components as we save based on the fetched
  // version, not on the argument so this can't compute that.
  res.saveSpec = null
  res.fetchSpec = spec
  if (!semver) semver = require('semver')
  const version = semver.valid(spec, true)
  const range = semver.validRange(spec, true)
  if (version) {
    res.type = 'version'
  } else if (range) {
    res.type = 'range'
  } else {
    if (encodeURIComponent(spec) !== spec) {
      throw invalidTagName(spec)
    }
    res.type = 'tag'
  }
  return res
}

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✏️ npa.js