vite/dist/node/cli.js.map

Native-ESM powered web dev build tool

{"version":3,"file":"cli.js","sources":["../../../../node_modules/cac/dist/index.mjs","../../../../node_modules/negotiator/lib/charset.js","../../../../node_modules/negotiator/lib/encoding.js","../../../../node_modules/negotiator/lib/language.js","../../../../node_modules/negotiator/lib/mediaType.js","../../../../node_modules/negotiator/index.js","../../../../node_modules/mime-db/index.js","../../../../node_modules/mime-types/index.js","../../../../node_modules/accepts/index.js","../../../../node_modules/compression/node_modules/bytes/index.js","../../../../node_modules/compressible/index.js","../../../../node_modules/compression/node_modules/debug/src/debug.js","../../../../node_modules/compression/node_modules/debug/src/browser.js","../../../../node_modules/compression/node_modules/debug/src/node.js","../../../../node_modules/compression/node_modules/debug/src/index.js","../../../../node_modules/on-headers/index.js","../../../../node_modules/compression/index.js","../../src/node/preview.ts","../../src/node/cli.ts"],"sourcesContent":["import { EventEmitter } from 'events';\n\nfunction toArr(any) {\n\treturn any == null ? [] : Array.isArray(any) ? any : [any];\n}\n\nfunction toVal(out, key, val, opts) {\n\tvar x, old=out[key], nxt=(\n\t\t!!~opts.string.indexOf(key) ? (val == null || val === true ? '' : String(val))\n\t\t: typeof val === 'boolean' ? val\n\t\t: !!~opts.boolean.indexOf(key) ? (val === 'false' ? false : val === 'true' || (out._.push((x = +val,x * 0 === 0) ? x : val),!!val))\n\t\t: (x = +val,x * 0 === 0) ? x : val\n\t);\n\tout[key] = old == null ? nxt : (Array.isArray(old) ? old.concat(nxt) : [old, nxt]);\n}\n\nfunction mri2 (args, opts) {\n\targs = args || [];\n\topts = opts || {};\n\n\tvar k, arr, arg, name, val, out={ _:[] };\n\tvar i=0, j=0, idx=0, len=args.length;\n\n\tconst alibi = opts.alias !== void 0;\n\tconst strict = opts.unknown !== void 0;\n\tconst defaults = opts.default !== void 0;\n\n\topts.alias = opts.alias || {};\n\topts.string = toArr(opts.string);\n\topts.boolean = toArr(opts.boolean);\n\n\tif (alibi) {\n\t\tfor (k in opts.alias) {\n\t\t\tarr = opts.alias[k] = toArr(opts.alias[k]);\n\t\t\tfor (i=0; i < arr.length; i++) {\n\t\t\t\t(opts.alias[arr[i]] = arr.concat(k)).splice(i, 1);\n\t\t\t}\n\t\t}\n\t}\n\n\tfor (i=opts.boolean.length; i-- > 0;) {\n\t\tarr = opts.alias[opts.boolean[i]] || [];\n\t\tfor (j=arr.length; j-- > 0;) opts.boolean.push(arr[j]);\n\t}\n\n\tfor (i=opts.string.length; i-- > 0;) {\n\t\tarr = opts.alias[opts.string[i]] || [];\n\t\tfor (j=arr.length; j-- > 0;) opts.string.push(arr[j]);\n\t}\n\n\tif (defaults) {\n\t\tfor (k in opts.default) {\n\t\t\tname = typeof opts.default[k];\n\t\t\tarr = opts.alias[k] = opts.alias[k] || [];\n\t\t\tif (opts[name] !== void 0) {\n\t\t\t\topts[name].push(k);\n\t\t\t\tfor (i=0; i < arr.length; i++) {\n\t\t\t\t\topts[name].push(arr[i]);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tconst keys = strict ? Object.keys(opts.alias) : [];\n\n\tfor (i=0; i < len; i++) {\n\t\targ = args[i];\n\n\t\tif (arg === '--') {\n\t\t\tout._ = out._.concat(args.slice(++i));\n\t\t\tbreak;\n\t\t}\n\n\t\tfor (j=0; j < arg.length; j++) {\n\t\t\tif (arg.charCodeAt(j) !== 45) break; // \"-\"\n\t\t}\n\n\t\tif (j === 0) {\n\t\t\tout._.push(arg);\n\t\t} else if (arg.substring(j, j + 3) === 'no-') {\n\t\t\tname = arg.substring(j + 3);\n\t\t\tif (strict && !~keys.indexOf(name)) {\n\t\t\t\treturn opts.unknown(arg);\n\t\t\t}\n\t\t\tout[name] = false;\n\t\t} else {\n\t\t\tfor (idx=j+1; idx < arg.length; idx++) {\n\t\t\t\tif (arg.charCodeAt(idx) === 61) break; // \"=\"\n\t\t\t}\n\n\t\t\tname = arg.substring(j, idx);\n\t\t\tval = arg.substring(++idx) || (i+1 === len || (''+args[i+1]).charCodeAt(0) === 45 || args[++i]);\n\t\t\tarr = (j === 2 ? [name] : name);\n\n\t\t\tfor (idx=0; idx < arr.length; idx++) {\n\t\t\t\tname = arr[idx];\n\t\t\t\tif (strict && !~keys.indexOf(name)) return opts.unknown('-'.repeat(j) + name);\n\t\t\t\ttoVal(out, name, (idx + 1 < arr.length) || val, opts);\n\t\t\t}\n\t\t}\n\t}\n\n\tif (defaults) {\n\t\tfor (k in opts.default) {\n\t\t\tif (out[k] === void 0) {\n\t\t\t\tout[k] = opts.default[k];\n\t\t\t}\n\t\t}\n\t}\n\n\tif (alibi) {\n\t\tfor (k in out) {\n\t\t\tarr = opts.alias[k] || [];\n\t\t\twhile (arr.length > 0) {\n\t\t\t\tout[arr.shift()] = out[k];\n\t\t\t}\n\t\t}\n\t}\n\n\treturn out;\n}\n\nconst removeBrackets = (v) => v.replace(/[<[].+/, \"\").trim();\nconst findAllBrackets = (v) => {\n  const ANGLED_BRACKET_RE_GLOBAL = /<([^>]+)>/g;\n  const SQUARE_BRACKET_RE_GLOBAL = /\\[([^\\]]+)\\]/g;\n  const res = [];\n  const parse = (match) => {\n    let variadic = false;\n    let value = match[1];\n    if (value.startsWith(\"...\")) {\n      value = value.slice(3);\n      variadic = true;\n    }\n    return {\n      required: match[0].startsWith(\"<\"),\n      value,\n      variadic\n    };\n  };\n  let angledMatch;\n  while (angledMatch = ANGLED_BRACKET_RE_GLOBAL.exec(v)) {\n    res.push(parse(angledMatch));\n  }\n  let squareMatch;\n  while (squareMatch = SQUARE_BRACKET_RE_GLOBAL.exec(v)) {\n    res.push(parse(squareMatch));\n  }\n  return res;\n};\nconst getMriOptions = (options) => {\n  const result = {alias: {}, boolean: []};\n  for (const [index, option] of options.entries()) {\n    if (option.names.length > 1) {\n      result.alias[option.names[0]] = option.names.slice(1);\n    }\n    if (option.isBoolean) {\n      if (option.negated) {\n        const hasStringTypeOption = options.some((o, i) => {\n          return i !== index && o.names.some((name) => option.names.includes(name)) && typeof o.required === \"boolean\";\n        });\n        if (!hasStringTypeOption) {\n          result.boolean.push(option.names[0]);\n        }\n      } else {\n        result.boolean.push(option.names[0]);\n      }\n    }\n  }\n  return result;\n};\nconst findLongest = (arr) => {\n  return arr.sort((a, b) => {\n    return a.length > b.length ? -1 : 1;\n  })[0];\n};\nconst padRight = (str, length) => {\n  return str.length >= length ? str : `${str}${\" \".repeat(length - str.length)}`;\n};\nconst camelcase = (input) => {\n  return input.replace(/([a-z])-([a-z])/g, (_, p1, p2) => {\n    return p1 + p2.toUpperCase();\n  });\n};\nconst setDotProp = (obj, keys, val) => {\n  let i = 0;\n  let length = keys.length;\n  let t = obj;\n  let x;\n  for (; i < length; ++i) {\n    x = t[keys[i]];\n    t = t[keys[i]] = i === length - 1 ? val : x != null ? x : !!~keys[i + 1].indexOf(\".\") || !(+keys[i + 1] > -1) ? {} : [];\n  }\n};\nconst setByType = (obj, transforms) => {\n  for (const key of Object.keys(transforms)) {\n    const transform = transforms[key];\n    if (transform.shouldTransform) {\n      obj[key] = Array.prototype.concat.call([], obj[key]);\n      if (typeof transform.transformFunction === \"function\") {\n        obj[key] = obj[key].map(transform.transformFunction);\n      }\n    }\n  }\n};\nconst getFileName = (input) => {\n  const m = /([^\\\\\\/]+)$/.exec(input);\n  return m ? m[1] : \"\";\n};\nconst camelcaseOptionName = (name) => {\n  return name.split(\".\").map((v, i) => {\n    return i === 0 ? camelcase(v) : v;\n  }).join(\".\");\n};\nclass CACError extends Error {\n  constructor(message) {\n    super(message);\n    this.name = this.constructor.name;\n    if (typeof Error.captureStackTrace === \"function\") {\n      Error.captureStackTrace(this, this.constructor);\n    } else {\n      this.stack = new Error(message).stack;\n    }\n  }\n}\n\nclass Option {\n  constructor(rawName, description, config) {\n    this.rawName = rawName;\n    this.description = description;\n    this.config = Object.assign({}, config);\n    rawName = rawName.replace(/\\.\\*/g, \"\");\n    this.negated = false;\n    this.names = removeBrackets(rawName).split(\",\").map((v) => {\n      let name = v.trim().replace(/^-{1,2}/, \"\");\n      if (name.startsWith(\"no-\")) {\n        this.negated = true;\n        name = name.replace(/^no-/, \"\");\n      }\n      return camelcaseOptionName(name);\n    }).sort((a, b) => a.length > b.length ? 1 : -1);\n    this.name = this.names[this.names.length - 1];\n    if (this.negated && this.config.default == null) {\n      this.config.default = true;\n    }\n    if (rawName.includes(\"<\")) {\n      this.required = true;\n    } else if (rawName.includes(\"[\")) {\n      this.required = false;\n    } else {\n      this.isBoolean = true;\n    }\n  }\n}\n\nconst processArgs = process.argv;\nconst platformInfo = `${process.platform}-${process.arch} node-${process.version}`;\n\nclass Command {\n  constructor(rawName, description, config = {}, cli) {\n    this.rawName = rawName;\n    this.description = description;\n    this.config = config;\n    this.cli = cli;\n    this.options = [];\n    this.aliasNames = [];\n    this.name = removeBrackets(rawName);\n    this.args = findAllBrackets(rawName);\n    this.examples = [];\n  }\n  usage(text) {\n    this.usageText = text;\n    return this;\n  }\n  allowUnknownOptions() {\n    this.config.allowUnknownOptions = true;\n    return this;\n  }\n  ignoreOptionDefaultValue() {\n    this.config.ignoreOptionDefaultValue = true;\n    return this;\n  }\n  version(version, customFlags = \"-v, --version\") {\n    this.versionNumber = version;\n    this.option(customFlags, \"Display version number\");\n    return this;\n  }\n  example(example) {\n    this.examples.push(example);\n    return this;\n  }\n  option(rawName, description, config) {\n    const option = new Option(rawName, description, config);\n    this.options.push(option);\n    return this;\n  }\n  alias(name) {\n    this.aliasNames.push(name);\n    return this;\n  }\n  action(callback) {\n    this.commandAction = callback;\n    return this;\n  }\n  isMatched(name) {\n    return this.name === name || this.aliasNames.includes(name);\n  }\n  get isDefaultCommand() {\n    return this.name === \"\" || this.aliasNames.includes(\"!\");\n  }\n  get isGlobalCommand() {\n    return this instanceof GlobalCommand;\n  }\n  hasOption(name) {\n    name = name.split(\".\")[0];\n    return this.options.find((option) => {\n      return option.names.includes(name);\n    });\n  }\n  outputHelp() {\n    const {name, commands} = this.cli;\n    const {\n      versionNumber,\n      options: globalOptions,\n      helpCallback\n    } = this.cli.globalCommand;\n    let sections = [\n      {\n        body: `${name}${versionNumber ? `/${versionNumber}` : \"\"}`\n      }\n    ];\n    sections.push({\n      title: \"Usage\",\n      body: `  $ ${name} ${this.usageText || this.rawName}`\n    });\n    const showCommands = (this.isGlobalCommand || this.isDefaultCommand) && commands.length > 0;\n    if (showCommands) {\n      const longestCommandName = findLongest(commands.map((command) => command.rawName));\n      sections.push({\n        title: \"Commands\",\n        body: commands.map((command) => {\n          return `  ${padRight(command.rawName, longestCommandName.length)}  ${command.description}`;\n        }).join(\"\\n\")\n      });\n      sections.push({\n        title: `For more info, run any command with the \\`--help\\` flag`,\n        body: commands.map((command) => `  $ ${name}${command.name === \"\" ? \"\" : ` ${command.name}`} --help`).join(\"\\n\")\n      });\n    }\n    const options = this.isGlobalCommand ? globalOptions : [...this.options, ...globalOptions || []];\n    if (options.length > 0) {\n      const longestOptionName = findLongest(options.map((option) => option.rawName));\n      sections.push({\n        title: \"Options\",\n        body: options.map((option) => {\n          return `  ${padRight(option.rawName, longestOptionName.length)}  ${option.description} ${option.config.default === void 0 ? \"\" : `(default: ${option.config.default})`}`;\n        }).join(\"\\n\")\n      });\n    }\n    if (this.examples.length > 0) {\n      sections.push({\n        title: \"Examples\",\n        body: this.examples.map((example) => {\n          if (typeof example === \"function\") {\n            return example(name);\n          }\n          return example;\n        }).join(\"\\n\")\n      });\n    }\n    if (helpCallback) {\n      sections = helpCallback(sections) || sections;\n    }\n    console.log(sections.map((section) => {\n      return section.title ? `${section.title}:\n${section.body}` : section.body;\n    }).join(\"\\n\\n\"));\n  }\n  outputVersion() {\n    const {name} = this.cli;\n    const {versionNumber} = this.cli.globalCommand;\n    if (versionNumber) {\n      console.log(`${name}/${versionNumber} ${platformInfo}`);\n    }\n  }\n  checkRequiredArgs() {\n    const minimalArgsCount = this.args.filter((arg) => arg.required).length;\n    if (this.cli.args.length < minimalArgsCount) {\n      throw new CACError(`missing required args for command \\`${this.rawName}\\``);\n    }\n  }\n  checkUnknownOptions() {\n    const {options, globalCommand} = this.cli;\n    if (!this.config.allowUnknownOptions) {\n      for (const name of Object.keys(options)) {\n        if (name !== \"--\" && !this.hasOption(name) && !globalCommand.hasOption(name)) {\n          throw new CACError(`Unknown option \\`${name.length > 1 ? `--${name}` : `-${name}`}\\``);\n        }\n      }\n    }\n  }\n  checkOptionValue() {\n    const {options: parsedOptions, globalCommand} = this.cli;\n    const options = [...globalCommand.options, ...this.options];\n    for (const option of options) {\n      const value = parsedOptions[option.name.split(\".\")[0]];\n      if (option.required) {\n        const hasNegated = options.some((o) => o.negated && o.names.includes(option.name));\n        if (value === true || value === false && !hasNegated) {\n          throw new CACError(`option \\`${option.rawName}\\` value is missing`);\n        }\n      }\n    }\n  }\n}\nclass GlobalCommand extends Command {\n  constructor(cli) {\n    super(\"@@global@@\", \"\", {}, cli);\n  }\n}\n\nvar __assign = Object.assign;\nclass CAC extends EventEmitter {\n  constructor(name = \"\") {\n    super();\n    this.name = name;\n    this.commands = [];\n    this.rawArgs = [];\n    this.args = [];\n    this.options = {};\n    this.globalCommand = new GlobalCommand(this);\n    this.globalCommand.usage(\"<command> [options]\");\n  }\n  usage(text) {\n    this.globalCommand.usage(text);\n    return this;\n  }\n  command(rawName, description, config) {\n    const command = new Command(rawName, description || \"\", config, this);\n    command.globalCommand = this.globalCommand;\n    this.commands.push(command);\n    return command;\n  }\n  option(rawName, description, config) {\n    this.globalCommand.option(rawName, description, config);\n    return this;\n  }\n  help(callback) {\n    this.globalCommand.option(\"-h, --help\", \"Display this message\");\n    this.globalCommand.helpCallback = callback;\n    this.showHelpOnExit = true;\n    return this;\n  }\n  version(version, customFlags = \"-v, --version\") {\n    this.globalCommand.version(version, customFlags);\n    this.showVersionOnExit = true;\n    return this;\n  }\n  example(example) {\n    this.globalCommand.example(example);\n    return this;\n  }\n  outputHelp() {\n    if (this.matchedCommand) {\n      this.matchedCommand.outputHelp();\n    } else {\n      this.globalCommand.outputHelp();\n    }\n  }\n  outputVersion() {\n    this.globalCommand.outputVersion();\n  }\n  setParsedInfo({args, options}, matchedCommand, matchedCommandName) {\n    this.args = args;\n    this.options = options;\n    if (matchedCommand) {\n      this.matchedCommand = matchedCommand;\n    }\n    if (matchedCommandName) {\n      this.matchedCommandName = matchedCommandName;\n    }\n    return this;\n  }\n  unsetMatchedCommand() {\n    this.matchedCommand = void 0;\n    this.matchedCommandName = void 0;\n  }\n  parse(argv = processArgs, {\n    run = true\n  } = {}) {\n    this.rawArgs = argv;\n    if (!this.name) {\n      this.name = argv[1] ? getFileName(argv[1]) : \"cli\";\n    }\n    let shouldParse = true;\n    for (const command of this.commands) {\n      const parsed = this.mri(argv.slice(2), command);\n      const commandName = parsed.args[0];\n      if (command.isMatched(commandName)) {\n        shouldParse = false;\n        const parsedInfo = __assign(__assign({}, parsed), {\n          args: parsed.args.slice(1)\n        });\n        this.setParsedInfo(parsedInfo, command, commandName);\n        this.emit(`command:${commandName}`, command);\n      }\n    }\n    if (shouldParse) {\n      for (const command of this.commands) {\n        if (command.name === \"\") {\n          shouldParse = false;\n          const parsed = this.mri(argv.slice(2), command);\n          this.setParsedInfo(parsed, command);\n          this.emit(`command:!`, command);\n        }\n      }\n    }\n    if (shouldParse) {\n      const parsed = this.mri(argv.slice(2));\n      this.setParsedInfo(parsed);\n    }\n    if (this.options.help && this.showHelpOnExit) {\n      this.outputHelp();\n      run = false;\n      this.unsetMatchedCommand();\n    }\n    if (this.options.version && this.showVersionOnExit) {\n      this.outputVersion();\n      run = false;\n      this.unsetMatchedCommand();\n    }\n    const parsedArgv = {args: this.args, options: this.options};\n    if (run) {\n      this.runMatchedCommand();\n    }\n    if (!this.matchedCommand && this.args[0]) {\n      this.emit(\"command:*\");\n    }\n    return parsedArgv;\n  }\n  mri(argv, command) {\n    const cliOptions = [\n      ...this.globalCommand.options,\n      ...command ? command.options : []\n    ];\n    const mriOptions = getMriOptions(cliOptions);\n    let argsAfterDoubleDashes = [];\n    const doubleDashesIndex = argv.indexOf(\"--\");\n    if (doubleDashesIndex > -1) {\n      argsAfterDoubleDashes = argv.slice(doubleDashesIndex + 1);\n      argv = argv.slice(0, doubleDashesIndex);\n    }\n    let parsed = mri2(argv, mriOptions);\n    parsed = Object.keys(parsed).reduce((res, name) => {\n      return __assign(__assign({}, res), {\n        [camelcaseOptionName(name)]: parsed[name]\n      });\n    }, {_: []});\n    const args = parsed._;\n    const options = {\n      \"--\": argsAfterDoubleDashes\n    };\n    const ignoreDefault = command && command.config.ignoreOptionDefaultValue ? command.config.ignoreOptionDefaultValue : this.globalCommand.config.ignoreOptionDefaultValue;\n    let transforms = Object.create(null);\n    for (const cliOption of cliOptions) {\n      if (!ignoreDefault && cliOption.config.default !== void 0) {\n        for (const name of cliOption.names) {\n          options[name] = cliOption.config.default;\n        }\n      }\n      if (Array.isArray(cliOption.config.type)) {\n        if (transforms[cliOption.name] === void 0) {\n          transforms[cliOption.name] = Object.create(null);\n          transforms[cliOption.name][\"shouldTransform\"] = true;\n          transforms[cliOption.name][\"transformFunction\"] = cliOption.config.type[0];\n        }\n      }\n    }\n    for (const key of Object.keys(parsed)) {\n      if (key !== \"_\") {\n        const keys = key.split(\".\");\n        setDotProp(options, keys, parsed[key]);\n        setByType(options, transforms);\n      }\n    }\n    return {\n      args,\n      options\n    };\n  }\n  runMatchedCommand() {\n    const {args, options, matchedCommand: command} = this;\n    if (!command || !command.commandAction)\n      return;\n    command.checkUnknownOptions();\n    command.checkOptionValue();\n    command.checkRequiredArgs();\n    const actionArgs = [];\n    command.args.forEach((arg, index) => {\n      if (arg.variadic) {\n        actionArgs.push(args.slice(index));\n      } else {\n        actionArgs.push(args[index]);\n      }\n    });\n    actionArgs.push(options);\n    return command.commandAction.apply(this, actionArgs);\n  }\n}\n\nconst cac = (name = \"\") => new CAC(name);\nif (typeof module !== \"undefined\") {\n  module.exports = cac;\n  Object.assign(module.exports, {\n    default: cac,\n    cac,\n    CAC: CAC,\n    Command: Command\n  });\n}\n\nexport default cac;\nexport { CAC, Command, cac };\n","/**\n * negotiator\n * Copyright(c) 2012 Isaac Z. Schlueter\n * Copyright(c) 2014 Federico Romero\n * Copyright(c) 2014-2015 Douglas Christopher Wilson\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = preferredCharsets;\nmodule.exports.preferredCharsets = preferredCharsets;\n\n/**\n * Module variables.\n * @private\n */\n\nvar simpleCharsetRegExp = /^\\s*([^\\s;]+)\\s*(?:;(.*))?$/;\n\n/**\n * Parse the Accept-Charset header.\n * @private\n */\n\nfunction parseAcceptCharset(accept) {\n  var accepts = accept.split(',');\n\n  for (var i = 0, j = 0; i < accepts.length; i++) {\n    var charset = parseCharset(accepts[i].trim(), i);\n\n    if (charset) {\n      accepts[j++] = charset;\n    }\n  }\n\n  // trim accepts\n  accepts.length = j;\n\n  return accepts;\n}\n\n/**\n * Parse a charset from the Accept-Charset header.\n * @private\n */\n\nfunction parseCharset(str, i) {\n  var match = simpleCharsetRegExp.exec(str);\n  if (!match) return null;\n\n  var charset = match[1];\n  var q = 1;\n  if (match[2]) {\n    var params = match[2].split(';')\n    for (var j = 0; j < params.length; j++) {\n      var p = params[j].trim().split('=');\n      if (p[0] === 'q') {\n        q = parseFloat(p[1]);\n        break;\n      }\n    }\n  }\n\n  return {\n    charset: charset,\n    q: q,\n    i: i\n  };\n}\n\n/**\n * Get the priority of a charset.\n * @private\n */\n\nfunction getCharsetPriority(charset, accepted, index) {\n  var priority = {o: -1, q: 0, s: 0};\n\n  for (var i = 0; i < accepted.length; i++) {\n    var spec = specify(charset, accepted[i], index);\n\n    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {\n      priority = spec;\n    }\n  }\n\n  return priority;\n}\n\n/**\n * Get the specificity of the charset.\n * @private\n */\n\nfunction specify(charset, spec, index) {\n  var s = 0;\n  if(spec.charset.toLowerCase() === charset.toLowerCase()){\n    s |= 1;\n  } else if (spec.charset !== '*' ) {\n    return null\n  }\n\n  return {\n    i: index,\n    o: spec.i,\n    q: spec.q,\n    s: s\n  }\n}\n\n/**\n * Get the preferred charsets from an Accept-Charset header.\n * @public\n */\n\nfunction preferredCharsets(accept, provided) {\n  // RFC 2616 sec 14.2: no header = *\n  var accepts = parseAcceptCharset(accept === undefined ? '*' : accept || '');\n\n  if (!provided) {\n    // sorted list of all charsets\n    return accepts\n      .filter(isQuality)\n      .sort(compareSpecs)\n      .map(getFullCharset);\n  }\n\n  var priorities = provided.map(function getPriority(type, index) {\n    return getCharsetPriority(type, accepts, index);\n  });\n\n  // sorted list of accepted charsets\n  return priorities.filter(isQuality).sort(compareSpecs).map(function getCharset(priority) {\n    return provided[priorities.indexOf(priority)];\n  });\n}\n\n/**\n * Compare two specs.\n * @private\n */\n\nfunction compareSpecs(a, b) {\n  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;\n}\n\n/**\n * Get full charset string.\n * @private\n */\n\nfunction getFullCharset(spec) {\n  return spec.charset;\n}\n\n/**\n * Check if a spec has any quality.\n * @private\n */\n\nfunction isQuality(spec) {\n  return spec.q > 0;\n}\n","/**\n * negotiator\n * Copyright(c) 2012 Isaac Z. Schlueter\n * Copyright(c) 2014 Federico Romero\n * Copyright(c) 2014-2015 Douglas Christopher Wilson\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = preferredEncodings;\nmodule.exports.preferredEncodings = preferredEncodings;\n\n/**\n * Module variables.\n * @private\n */\n\nvar simpleEncodingRegExp = /^\\s*([^\\s;]+)\\s*(?:;(.*))?$/;\n\n/**\n * Parse the Accept-Encoding header.\n * @private\n */\n\nfunction parseAcceptEncoding(accept) {\n  var accepts = accept.split(',');\n  var hasIdentity = false;\n  var minQuality = 1;\n\n  for (var i = 0, j = 0; i < accepts.length; i++) {\n    var encoding = parseEncoding(accepts[i].trim(), i);\n\n    if (encoding) {\n      accepts[j++] = encoding;\n      hasIdentity = hasIdentity || specify('identity', encoding);\n      minQuality = Math.min(minQuality, encoding.q || 1);\n    }\n  }\n\n  if (!hasIdentity) {\n    /*\n     * If identity doesn't explicitly appear in the accept-encoding header,\n     * it's added to the list of acceptable encoding with the lowest q\n     */\n    accepts[j++] = {\n      encoding: 'identity',\n      q: minQuality,\n      i: i\n    };\n  }\n\n  // trim accepts\n  accepts.length = j;\n\n  return accepts;\n}\n\n/**\n * Parse an encoding from the Accept-Encoding header.\n * @private\n */\n\nfunction parseEncoding(str, i) {\n  var match = simpleEncodingRegExp.exec(str);\n  if (!match) return null;\n\n  var encoding = match[1];\n  var q = 1;\n  if (match[2]) {\n    var params = match[2].split(';');\n    for (var j = 0; j < params.length; j++) {\n      var p = params[j].trim().split('=');\n      if (p[0] === 'q') {\n        q = parseFloat(p[1]);\n        break;\n      }\n    }\n  }\n\n  return {\n    encoding: encoding,\n    q: q,\n    i: i\n  };\n}\n\n/**\n * Get the priority of an encoding.\n * @private\n */\n\nfunction getEncodingPriority(encoding, accepted, index) {\n  var priority = {o: -1, q: 0, s: 0};\n\n  for (var i = 0; i < accepted.length; i++) {\n    var spec = specify(encoding, accepted[i], index);\n\n    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {\n      priority = spec;\n    }\n  }\n\n  return priority;\n}\n\n/**\n * Get the specificity of the encoding.\n * @private\n */\n\nfunction specify(encoding, spec, index) {\n  var s = 0;\n  if(spec.encoding.toLowerCase() === encoding.toLowerCase()){\n    s |= 1;\n  } else if (spec.encoding !== '*' ) {\n    return null\n  }\n\n  return {\n    i: index,\n    o: spec.i,\n    q: spec.q,\n    s: s\n  }\n};\n\n/**\n * Get the preferred encodings from an Accept-Encoding header.\n * @public\n */\n\nfunction preferredEncodings(accept, provided) {\n  var accepts = parseAcceptEncoding(accept || '');\n\n  if (!provided) {\n    // sorted list of all encodings\n    return accepts\n      .filter(isQuality)\n      .sort(compareSpecs)\n      .map(getFullEncoding);\n  }\n\n  var priorities = provided.map(function getPriority(type, index) {\n    return getEncodingPriority(type, accepts, index);\n  });\n\n  // sorted list of accepted encodings\n  return priorities.filter(isQuality).sort(compareSpecs).map(function getEncoding(priority) {\n    return provided[priorities.indexOf(priority)];\n  });\n}\n\n/**\n * Compare two specs.\n * @private\n */\n\nfunction compareSpecs(a, b) {\n  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;\n}\n\n/**\n * Get full encoding string.\n * @private\n */\n\nfunction getFullEncoding(spec) {\n  return spec.encoding;\n}\n\n/**\n * Check if a spec has any quality.\n * @private\n */\n\nfunction isQuality(spec) {\n  return spec.q > 0;\n}\n","/**\n * negotiator\n * Copyright(c) 2012 Isaac Z. Schlueter\n * Copyright(c) 2014 Federico Romero\n * Copyright(c) 2014-2015 Douglas Christopher Wilson\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = preferredLanguages;\nmodule.exports.preferredLanguages = preferredLanguages;\n\n/**\n * Module variables.\n * @private\n */\n\nvar simpleLanguageRegExp = /^\\s*([^\\s\\-;]+)(?:-([^\\s;]+))?\\s*(?:;(.*))?$/;\n\n/**\n * Parse the Accept-Language header.\n * @private\n */\n\nfunction parseAcceptLanguage(accept) {\n  var accepts = accept.split(',');\n\n  for (var i = 0, j = 0; i < accepts.length; i++) {\n    var language = parseLanguage(accepts[i].trim(), i);\n\n    if (language) {\n      accepts[j++] = language;\n    }\n  }\n\n  // trim accepts\n  accepts.length = j;\n\n  return accepts;\n}\n\n/**\n * Parse a language from the Accept-Language header.\n * @private\n */\n\nfunction parseLanguage(str, i) {\n  var match = simpleLanguageRegExp.exec(str);\n  if (!match) return null;\n\n  var prefix = match[1],\n    suffix = match[2],\n    full = prefix;\n\n  if (suffix) full += \"-\" + suffix;\n\n  var q = 1;\n  if (match[3]) {\n    var params = match[3].split(';')\n    for (var j = 0; j < params.length; j++) {\n      var p = params[j].split('=');\n      if (p[0] === 'q') q = parseFloat(p[1]);\n    }\n  }\n\n  return {\n    prefix: prefix,\n    suffix: suffix,\n    q: q,\n    i: i,\n    full: full\n  };\n}\n\n/**\n * Get the priority of a language.\n * @private\n */\n\nfunction getLanguagePriority(language, accepted, index) {\n  var priority = {o: -1, q: 0, s: 0};\n\n  for (var i = 0; i < accepted.length; i++) {\n    var spec = specify(language, accepted[i], index);\n\n    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {\n      priority = spec;\n    }\n  }\n\n  return priority;\n}\n\n/**\n * Get the specificity of the language.\n * @private\n */\n\nfunction specify(language, spec, index) {\n  var p = parseLanguage(language)\n  if (!p) return null;\n  var s = 0;\n  if(spec.full.toLowerCase() === p.full.toLowerCase()){\n    s |= 4;\n  } else if (spec.prefix.toLowerCase() === p.full.toLowerCase()) {\n    s |= 2;\n  } else if (spec.full.toLowerCase() === p.prefix.toLowerCase()) {\n    s |= 1;\n  } else if (spec.full !== '*' ) {\n    return null\n  }\n\n  return {\n    i: index,\n    o: spec.i,\n    q: spec.q,\n    s: s\n  }\n};\n\n/**\n * Get the preferred languages from an Accept-Language header.\n * @public\n */\n\nfunction preferredLanguages(accept, provided) {\n  // RFC 2616 sec 14.4: no header = *\n  var accepts = parseAcceptLanguage(accept === undefined ? '*' : accept || '');\n\n  if (!provided) {\n    // sorted list of all languages\n    return accepts\n      .filter(isQuality)\n      .sort(compareSpecs)\n      .map(getFullLanguage);\n  }\n\n  var priorities = provided.map(function getPriority(type, index) {\n    return getLanguagePriority(type, accepts, index);\n  });\n\n  // sorted list of accepted languages\n  return priorities.filter(isQuality).sort(compareSpecs).map(function getLanguage(priority) {\n    return provided[priorities.indexOf(priority)];\n  });\n}\n\n/**\n * Compare two specs.\n * @private\n */\n\nfunction compareSpecs(a, b) {\n  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;\n}\n\n/**\n * Get full language string.\n * @private\n */\n\nfunction getFullLanguage(spec) {\n  return spec.full;\n}\n\n/**\n * Check if a spec has any quality.\n * @private\n */\n\nfunction isQuality(spec) {\n  return spec.q > 0;\n}\n","/**\n * negotiator\n * Copyright(c) 2012 Isaac Z. Schlueter\n * Copyright(c) 2014 Federico Romero\n * Copyright(c) 2014-2015 Douglas Christopher Wilson\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = preferredMediaTypes;\nmodule.exports.preferredMediaTypes = preferredMediaTypes;\n\n/**\n * Module variables.\n * @private\n */\n\nvar simpleMediaTypeRegExp = /^\\s*([^\\s\\/;]+)\\/([^;\\s]+)\\s*(?:;(.*))?$/;\n\n/**\n * Parse the Accept header.\n * @private\n */\n\nfunction parseAccept(accept) {\n  var accepts = splitMediaTypes(accept);\n\n  for (var i = 0, j = 0; i < accepts.length; i++) {\n    var mediaType = parseMediaType(accepts[i].trim(), i);\n\n    if (mediaType) {\n      accepts[j++] = mediaType;\n    }\n  }\n\n  // trim accepts\n  accepts.length = j;\n\n  return accepts;\n}\n\n/**\n * Parse a media type from the Accept header.\n * @private\n */\n\nfunction parseMediaType(str, i) {\n  var match = simpleMediaTypeRegExp.exec(str);\n  if (!match) return null;\n\n  var params = Object.create(null);\n  var q = 1;\n  var subtype = match[2];\n  var type = match[1];\n\n  if (match[3]) {\n    var kvps = splitParameters(match[3]).map(splitKeyValuePair);\n\n    for (var j = 0; j < kvps.length; j++) {\n      var pair = kvps[j];\n      var key = pair[0].toLowerCase();\n      var val = pair[1];\n\n      // get the value, unwrapping quotes\n      var value = val && val[0] === '\"' && val[val.length - 1] === '\"'\n        ? val.substr(1, val.length - 2)\n        : val;\n\n      if (key === 'q') {\n        q = parseFloat(value);\n        break;\n      }\n\n      // store parameter\n      params[key] = value;\n    }\n  }\n\n  return {\n    type: type,\n    subtype: subtype,\n    params: params,\n    q: q,\n    i: i\n  };\n}\n\n/**\n * Get the priority of a media type.\n * @private\n */\n\nfunction getMediaTypePriority(type, accepted, index) {\n  var priority = {o: -1, q: 0, s: 0};\n\n  for (var i = 0; i < accepted.length; i++) {\n    var spec = specify(type, accepted[i], index);\n\n    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {\n      priority = spec;\n    }\n  }\n\n  return priority;\n}\n\n/**\n * Get the specificity of the media type.\n * @private\n */\n\nfunction specify(type, spec, index) {\n  var p = parseMediaType(type);\n  var s = 0;\n\n  if (!p) {\n    return null;\n  }\n\n  if(spec.type.toLowerCase() == p.type.toLowerCase()) {\n    s |= 4\n  } else if(spec.type != '*') {\n    return null;\n  }\n\n  if(spec.subtype.toLowerCase() == p.subtype.toLowerCase()) {\n    s |= 2\n  } else if(spec.subtype != '*') {\n    return null;\n  }\n\n  var keys = Object.keys(spec.params);\n  if (keys.length > 0) {\n    if (keys.every(function (k) {\n      return spec.params[k] == '*' || (spec.params[k] || '').toLowerCase() == (p.params[k] || '').toLowerCase();\n    })) {\n      s |= 1\n    } else {\n      return null\n    }\n  }\n\n  return {\n    i: index,\n    o: spec.i,\n    q: spec.q,\n    s: s,\n  }\n}\n\n/**\n * Get the preferred media types from an Accept header.\n * @public\n */\n\nfunction preferredMediaTypes(accept, provided) {\n  // RFC 2616 sec 14.2: no header = */*\n  var accepts = parseAccept(accept === undefined ? '*/*' : accept || '');\n\n  if (!provided) {\n    // sorted list of all types\n    return accepts\n      .filter(isQuality)\n      .sort(compareSpecs)\n      .map(getFullType);\n  }\n\n  var priorities = provided.map(function getPriority(type, index) {\n    return getMediaTypePriority(type, accepts, index);\n  });\n\n  // sorted list of accepted types\n  return priorities.filter(isQuality).sort(compareSpecs).map(function getType(priority) {\n    return provided[priorities.indexOf(priority)];\n  });\n}\n\n/**\n * Compare two specs.\n * @private\n */\n\nfunction compareSpecs(a, b) {\n  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;\n}\n\n/**\n * Get full type string.\n * @private\n */\n\nfunction getFullType(spec) {\n  return spec.type + '/' + spec.subtype;\n}\n\n/**\n * Check if a spec has any quality.\n * @private\n */\n\nfunction isQuality(spec) {\n  return spec.q > 0;\n}\n\n/**\n * Count the number of quotes in a string.\n * @private\n */\n\nfunction quoteCount(string) {\n  var count = 0;\n  var index = 0;\n\n  while ((index = string.indexOf('\"', index)) !== -1) {\n    count++;\n    index++;\n  }\n\n  return count;\n}\n\n/**\n * Split a key value pair.\n * @private\n */\n\nfunction splitKeyValuePair(str) {\n  var index = str.indexOf('=');\n  var key;\n  var val;\n\n  if (index === -1) {\n    key = str;\n  } else {\n    key = str.substr(0, index);\n    val = str.substr(index + 1);\n  }\n\n  return [key, val];\n}\n\n/**\n * Split an Accept header into media types.\n * @private\n */\n\nfunction splitMediaTypes(accept) {\n  var accepts = accept.split(',');\n\n  for (var i = 1, j = 0; i < accepts.length; i++) {\n    if (quoteCount(accepts[j]) % 2 == 0) {\n      accepts[++j] = accepts[i];\n    } else {\n      accepts[j] += ',' + accepts[i];\n    }\n  }\n\n  // trim accepts\n  accepts.length = j + 1;\n\n  return accepts;\n}\n\n/**\n * Split a string of parameters.\n * @private\n */\n\nfunction splitParameters(str) {\n  var parameters = str.split(';');\n\n  for (var i = 1, j = 0; i < parameters.length; i++) {\n    if (quoteCount(parameters[j]) % 2 == 0) {\n      parameters[++j] = parameters[i];\n    } else {\n      parameters[j] += ';' + parameters[i];\n    }\n  }\n\n  // trim parameters\n  parameters.length = j + 1;\n\n  for (var i = 0; i < parameters.length; i++) {\n    parameters[i] = parameters[i].trim();\n  }\n\n  return parameters;\n}\n","/*!\n * negotiator\n * Copyright(c) 2012 Federico Romero\n * Copyright(c) 2012-2014 Isaac Z. Schlueter\n * Copyright(c) 2015 Douglas Christopher Wilson\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Cached loaded submodules.\n * @private\n */\n\nvar modules = Object.create(null);\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = Negotiator;\nmodule.exports.Negotiator = Negotiator;\n\n/**\n * Create a Negotiator instance from a request.\n * @param {object} request\n * @public\n */\n\nfunction Negotiator(request) {\n  if (!(this instanceof Negotiator)) {\n    return new Negotiator(request);\n  }\n\n  this.request = request;\n}\n\nNegotiator.prototype.charset = function charset(available) {\n  var set = this.charsets(available);\n  return set && set[0];\n};\n\nNegotiator.prototype.charsets = function charsets(available) {\n  var preferredCharsets = loadModule('charset').preferredCharsets;\n  return preferredCharsets(this.request.headers['accept-charset'], available);\n};\n\nNegotiator.prototype.encoding = function encoding(available) {\n  var set = this.encodings(available);\n  return set && set[0];\n};\n\nNegotiator.prototype.encodings = function encodings(available) {\n  var preferredEncodings = loadModule('encoding').preferredEncodings;\n  return preferredEncodings(this.request.headers['accept-encoding'], available);\n};\n\nNegotiator.prototype.language = function language(available) {\n  var set = this.languages(available);\n  return set && set[0];\n};\n\nNegotiator.prototype.languages = function languages(available) {\n  var preferredLanguages = loadModule('language').preferredLanguages;\n  return preferredLanguages(this.request.headers['accept-language'], available);\n};\n\nNegotiator.prototype.mediaType = function mediaType(available) {\n  var set = this.mediaTypes(available);\n  return set && set[0];\n};\n\nNegotiator.prototype.mediaTypes = function mediaTypes(available) {\n  var preferredMediaTypes = loadModule('mediaType').preferredMediaTypes;\n  return preferredMediaTypes(this.request.headers.accept, available);\n};\n\n// Backwards compatibility\nNegotiator.prototype.preferredCharset = Negotiator.prototype.charset;\nNegotiator.prototype.preferredCharsets = Negotiator.prototype.charsets;\nNegotiator.prototype.preferredEncoding = Negotiator.prototype.encoding;\nNegotiator.prototype.preferredEncodings = Negotiator.prototype.encodings;\nNegotiator.prototype.preferredLanguage = Negotiator.prototype.language;\nNegotiator.prototype.preferredLanguages = Negotiator.prototype.languages;\nNegotiator.prototype.preferredMediaType = Negotiator.prototype.mediaType;\nNegotiator.prototype.preferredMediaTypes = Negotiator.prototype.mediaTypes;\n\n/**\n * Load the given module.\n * @private\n */\n\nfunction loadModule(moduleName) {\n  var module = modules[moduleName];\n\n  if (module !== undefined) {\n    return module;\n  }\n\n  // This uses a switch for static require analysis\n  switch (moduleName) {\n    case 'charset':\n      module = require('./lib/charset');\n      break;\n    case 'encoding':\n      module = require('./lib/encoding');\n      break;\n    case 'language':\n      module = require('./lib/language');\n      break;\n    case 'mediaType':\n      module = require('./lib/mediaType');\n      break;\n    default:\n      throw new Error('Cannot find module \\'' + moduleName + '\\'');\n  }\n\n  // Store to prevent invoking require()\n  modules[moduleName] = module;\n\n  return module;\n}\n","/*!\n * mime-db\n * Copyright(c) 2014 Jonathan Ong\n * MIT Licensed\n */\n\n/**\n * Module exports.\n */\n\nmodule.exports = require('./db.json')\n","/*!\n * mime-types\n * Copyright(c) 2014 Jonathan Ong\n * Copyright(c) 2015 Douglas Christopher Wilson\n * MIT Licensed\n */\n\n'use strict'\n\n/**\n * Module dependencies.\n * @private\n */\n\nvar db = require('mime-db')\nvar extname = require('path').extname\n\n/**\n * Module variables.\n * @private\n */\n\nvar EXTRACT_TYPE_REGEXP = /^\\s*([^;\\s]*)(?:;|\\s|$)/\nvar TEXT_TYPE_REGEXP = /^text\\//i\n\n/**\n * Module exports.\n * @public\n */\n\nexports.charset = charset\nexports.charsets = { lookup: charset }\nexports.contentType = contentType\nexports.extension = extension\nexports.extensions = Object.create(null)\nexports.lookup = lookup\nexports.types = Object.create(null)\n\n// Populate the extensions/types maps\npopulateMaps(exports.extensions, exports.types)\n\n/**\n * Get the default charset for a MIME type.\n *\n * @param {string} type\n * @return {boolean|string}\n */\n\nfunction charset (type) {\n  if (!type || typeof type !== 'string') {\n    return false\n  }\n\n  // TODO: use media-typer\n  var match = EXTRACT_TYPE_REGEXP.exec(type)\n  var mime = match && db[match[1].toLowerCase()]\n\n  if (mime && mime.charset) {\n    return mime.charset\n  }\n\n  // default text/* to utf-8\n  if (match && TEXT_TYPE_REGEXP.test(match[1])) {\n    return 'UTF-8'\n  }\n\n  return false\n}\n\n/**\n * Create a full Content-Type header given a MIME type or extension.\n *\n * @param {string} str\n * @return {boolean|string}\n */\n\nfunction contentType (str) {\n  // TODO: should this even be in this module?\n  if (!str || typeof str !== 'string') {\n    return false\n  }\n\n  var mime = str.indexOf('/') === -1\n    ? exports.lookup(str)\n    : str\n\n  if (!mime) {\n    return false\n  }\n\n  // TODO: use content-type or other module\n  if (mime.indexOf('charset') === -1) {\n    var charset = exports.charset(mime)\n    if (charset) mime += '; charset=' + charset.toLowerCase()\n  }\n\n  return mime\n}\n\n/**\n * Get the default extension for a MIME type.\n *\n * @param {string} type\n * @return {boolean|string}\n */\n\nfunction extension (type) {\n  if (!type || typeof type !== 'string') {\n    return false\n  }\n\n  // TODO: use media-typer\n  var match = EXTRACT_TYPE_REGEXP.exec(type)\n\n  // get extensions\n  var exts = match && exports.extensions[match[1].toLowerCase()]\n\n  if (!exts || !exts.length) {\n    return false\n  }\n\n  return exts[0]\n}\n\n/**\n * Lookup the MIME type for a file path/extension.\n *\n * @param {string} path\n * @return {boolean|string}\n */\n\nfunction lookup (path) {\n  if (!path || typeof path !== 'string') {\n    return false\n  }\n\n  // get the extension (\"ext\" or \".ext\" or full path)\n  var extension = extname('x.' + path)\n    .toLowerCase()\n    .substr(1)\n\n  if (!extension) {\n    return false\n  }\n\n  return exports.types[extension] || false\n}\n\n/**\n * Populate the extensions and types maps.\n * @private\n */\n\nfunction populateMaps (extensions, types) {\n  // source preference (least -> most)\n  var preference = ['nginx', 'apache', undefined, 'iana']\n\n  Object.keys(db).forEach(function forEachMimeType (type) {\n    var mime = db[type]\n    var exts = mime.extensions\n\n    if (!exts || !exts.length) {\n      return\n    }\n\n    // mime -> extensions\n    extensions[type] = exts\n\n    // extension -> mime\n    for (var i = 0; i < exts.length; i++) {\n      var extension = exts[i]\n\n      if (types[extension]) {\n        var from = preference.indexOf(db[types[extension]].source)\n        var to = preference.indexOf(mime.source)\n\n        if (types[extension] !== 'application/octet-stream' &&\n          (from > to || (from === to && types[extension].substr(0, 12) === 'application/'))) {\n          // skip the remapping\n          continue\n        }\n      }\n\n      // set the extension -> mime\n      types[extension] = type\n    }\n  })\n}\n","/*!\n * accepts\n * Copyright(c) 2014 Jonathan Ong\n * Copyright(c) 2015 Douglas Christopher Wilson\n * MIT Licensed\n */\n\n'use strict'\n\n/**\n * Module dependencies.\n * @private\n */\n\nvar Negotiator = require('negotiator')\nvar mime = require('mime-types')\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = Accepts\n\n/**\n * Create a new Accepts object for the given req.\n *\n * @param {object} req\n * @public\n */\n\nfunction Accepts (req) {\n  if (!(this instanceof Accepts)) {\n    return new Accepts(req)\n  }\n\n  this.headers = req.headers\n  this.negotiator = new Negotiator(req)\n}\n\n/**\n * Check if the given `type(s)` is acceptable, returning\n * the best match when true, otherwise `undefined`, in which\n * case you should respond with 406 \"Not Acceptable\".\n *\n * The `type` value may be a single mime type string\n * such as \"application/json\", the extension name\n * such as \"json\" or an array `[\"json\", \"html\", \"text/plain\"]`. When a list\n * or array is given the _best_ match, if any is returned.\n *\n * Examples:\n *\n *     // Accept: text/html\n *     this.types('html');\n *     // => \"html\"\n *\n *     // Accept: text/*, application/json\n *     this.types('html');\n *     // => \"html\"\n *     this.types('text/html');\n *     // => \"text/html\"\n *     this.types('json', 'text');\n *     // => \"json\"\n *     this.types('application/json');\n *     // => \"application/json\"\n *\n *     // Accept: text/*, application/json\n *     this.types('image/png');\n *     this.types('png');\n *     // => undefined\n *\n *     // Accept: text/*;q=.5, application/json\n *     this.types(['html', 'json']);\n *     this.types('html', 'json');\n *     // => \"json\"\n *\n * @param {String|Array} types...\n * @return {String|Array|Boolean}\n * @public\n */\n\nAccepts.prototype.type =\nAccepts.prototype.types = function (types_) {\n  var types = types_\n\n  // support flattened arguments\n  if (types && !Array.isArray(types)) {\n    types = new Array(arguments.length)\n    for (var i = 0; i < types.length; i++) {\n      types[i] = arguments[i]\n    }\n  }\n\n  // no types, return all requested types\n  if (!types || types.length === 0) {\n    return this.negotiator.mediaTypes()\n  }\n\n  // no accept header, return first given type\n  if (!this.headers.accept) {\n    return types[0]\n  }\n\n  var mimes = types.map(extToMime)\n  var accepts = this.negotiator.mediaTypes(mimes.filter(validMime))\n  var first = accepts[0]\n\n  return first\n    ? types[mimes.indexOf(first)]\n    : false\n}\n\n/**\n * Return accepted encodings or best fit based on `encodings`.\n *\n * Given `Accept-Encoding: gzip, deflate`\n * an array sorted by quality is returned:\n *\n *     ['gzip', 'deflate']\n *\n * @param {String|Array} encodings...\n * @return {String|Array}\n * @public\n */\n\nAccepts.prototype.encoding =\nAccepts.prototype.encodings = function (encodings_) {\n  var encodings = encodings_\n\n  // support flattened arguments\n  if (encodings && !Array.isArray(encodings)) {\n    encodings = new Array(arguments.length)\n    for (var i = 0; i < encodings.length; i++) {\n      encodings[i] = arguments[i]\n    }\n  }\n\n  // no encodings, return all requested encodings\n  if (!encodings || encodings.length === 0) {\n    return this.negotiator.encodings()\n  }\n\n  return this.negotiator.encodings(encodings)[0] || false\n}\n\n/**\n * Return accepted charsets or best fit based on `charsets`.\n *\n * Given `Accept-Charset: utf-8, iso-8859-1;q=0.2, utf-7;q=0.5`\n * an array sorted by quality is returned:\n *\n *     ['utf-8', 'utf-7', 'iso-8859-1']\n *\n * @param {String|Array} charsets...\n * @return {String|Array}\n * @public\n */\n\nAccepts.prototype.charset =\nAccepts.prototype.charsets = function (charsets_) {\n  var charsets = charsets_\n\n  // support flattened arguments\n  if (charsets && !Array.isArray(charsets)) {\n    charsets = new Array(arguments.length)\n    for (var i = 0; i < charsets.length; i++) {\n      charsets[i] = arguments[i]\n    }\n  }\n\n  // no charsets, return all requested charsets\n  if (!charsets || charsets.length === 0) {\n    return this.negotiator.charsets()\n  }\n\n  return this.negotiator.charsets(charsets)[0] || false\n}\n\n/**\n * Return accepted languages or best fit based on `langs`.\n *\n * Given `Accept-Language: en;q=0.8, es, pt`\n * an array sorted by quality is returned:\n *\n *     ['es', 'pt', 'en']\n *\n * @param {String|Array} langs...\n * @return {Array|String}\n * @public\n */\n\nAccepts.prototype.lang =\nAccepts.prototype.langs =\nAccepts.prototype.language =\nAccepts.prototype.languages = function (languages_) {\n  var languages = languages_\n\n  // support flattened arguments\n  if (languages && !Array.isArray(languages)) {\n    languages = new Array(arguments.length)\n    for (var i = 0; i < languages.length; i++) {\n      languages[i] = arguments[i]\n    }\n  }\n\n  // no languages, return all requested languages\n  if (!languages || languages.length === 0) {\n    return this.negotiator.languages()\n  }\n\n  return this.negotiator.languages(languages)[0] || false\n}\n\n/**\n * Convert extnames to mime.\n *\n * @param {String} type\n * @return {String}\n * @private\n */\n\nfunction extToMime (type) {\n  return type.indexOf('/') === -1\n    ? mime.lookup(type)\n    : type\n}\n\n/**\n * Check if mime is valid.\n *\n * @param {String} type\n * @return {String}\n * @private\n */\n\nfunction validMime (type) {\n  return typeof type === 'string'\n}\n","/*!\n * bytes\n * Copyright(c) 2012-2014 TJ Holowaychuk\n * Copyright(c) 2015 Jed Watson\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = bytes;\nmodule.exports.format = format;\nmodule.exports.parse = parse;\n\n/**\n * Module variables.\n * @private\n */\n\nvar formatThousandsRegExp = /\\B(?=(\\d{3})+(?!\\d))/g;\n\nvar formatDecimalsRegExp = /(?:\\.0*|(\\.[^0]+)0+)$/;\n\nvar map = {\n  b:  1,\n  kb: 1 << 10,\n  mb: 1 << 20,\n  gb: 1 << 30,\n  tb: ((1 << 30) * 1024)\n};\n\nvar parseRegExp = /^((-|\\+)?(\\d+(?:\\.\\d+)?)) *(kb|mb|gb|tb)$/i;\n\n/**\n * Convert the given value in bytes into a string or parse to string to an integer in bytes.\n *\n * @param {string|number} value\n * @param {{\n *  case: [string],\